US20070182220A1 - Folding Chair Cot For Use With Emergency Vehicles - Google Patents
Folding Chair Cot For Use With Emergency Vehicles Download PDFInfo
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- US20070182220A1 US20070182220A1 US11/734,229 US73422907A US2007182220A1 US 20070182220 A1 US20070182220 A1 US 20070182220A1 US 73422907 A US73422907 A US 73422907A US 2007182220 A1 US2007182220 A1 US 2007182220A1
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- Prior art keywords
- support
- chair cot
- cot
- chair
- disposable
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
- A61G1/00—Stretchers
- A61G1/013—Stretchers foldable or collapsible
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
- A61G1/00—Stretchers
- A61G1/017—Stretchers convertible into chairs
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
- A61G1/00—Stretchers
- A61G1/02—Stretchers with wheels
- A61G1/0206—Stretchers with wheels characterised by the number of supporting wheels if stretcher is extended
- A61G1/0218—3 pairs having wheels within a pair on the same position in longitudinal direction, e.g. on the same axis
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
- A61G1/00—Stretchers
- A61G1/02—Stretchers with wheels
- A61G1/0206—Stretchers with wheels characterised by the number of supporting wheels if stretcher is extended
- A61G1/0225—Stretchers with wheels characterised by the number of supporting wheels if stretcher is extended other configuration, e.g. odd number of wheels
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
- A61G1/00—Stretchers
- A61G1/02—Stretchers with wheels
- A61G1/0237—Stretchers with wheels having at least one swivelling wheel, e.g. castors
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
- A61G1/00—Stretchers
- A61G1/02—Stretchers with wheels
- A61G1/025—Stretchers with wheels having auxiliary wheels, e.g. wheels not touching the ground in extended position
- A61G1/0268—Stretchers with wheels having auxiliary wheels, e.g. wheels not touching the ground in extended position having deployable or retractable wheels
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
- A61G1/00—Stretchers
- A61G1/02—Stretchers with wheels
- A61G1/0281—Stretchers with wheels having a steering device
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
- A61G1/00—Stretchers
- A61G1/02—Stretchers with wheels
- A61G1/0287—Stretchers with wheels having brakes, e.g. slowing down and/or holding
Abstract
Description
- This application claims priority to and is a continuation-in-part of U.S. patent application Ser. No. 11/062,646, filed Feb. 22, 2005, entitled Folding Chair Cot for Use with Emergency Vehicles, and naming Nathan R. Walkingshaw as the inventor.
- 1. Field of the Invention
- The present invention relates to a cot, and in particular to a collapsible emergency vehicle chair cot including a support system and a movement system.
- 2. Background
- Cots are used to transport incapacitated or injured individuals from one location to another. For example, EMTs typically transport emergency medical patients from one location into their ambulances using cots. Early cots merely consisted of cloth stretched between two poles. A patient was positioned on the cloth and two emergency workers carried either end of the poles, thereby supporting the patient. The primary problem with this design is that it requires two emergency workers to use both of their hands to transport their patient. This is problematic because emergency workers typically carry equipment and may need to perform tasks on the patients while being transported. Later, wheels were added to rigid cots to make gurneys which are easier for emergency workers to move patients from a particular location into an emergency vehicle. These added wheels allowed patients to easily be wheeled across flat surfaces to an emergency vehicle. The added wheels are also configured to collapse such that the cot could be properly fitted into an emergency vehicle and serve as a bed during transportation to a hospital. Additional wheels were eventually added to the loading end of cots in order to minimize friction and facilitate wheeling the cot into an emergency vehicle.
- While these wheeled gurney embodiments provide significant advantages over the traditional cloth-type cots, there are still significant problems. For example, if the patient must be transported over uneven surfaces such as stairs, curbs, or inclines, the conventional wheeled gurney will still require at least two emergency workers to properly transport the patient. In addition, on steep and irregular inclines, it is very difficult to support and stabilize the uphill side of the wheeled cot because it will be disposed very close to the ground. Further, certain uneven surfaces may cause the cot to bounce or shift resulting in additional pain and possibly injury to the patient. Therefore, for at least these reasons there is a need in the industry for an improved cot.
- The present invention relates to a collapsible emergency vehicle chair cot that includes a support system and a movement system. The support system is a retractable system disposed on the bottom of the cot to support the chair cot during transportation. For example, one embodiment of a support system includes a track that extends from the bottom for the chair cot. The track supports the chair cot thereby minimizing the need for an emergency worker to manually support the chair cot during transportation. The movement system is coupled to the support system and utilizes rotational movement to assist in moving the chair cot over a surface. For example, one embodiment of a movement system includes coupling a motor system and a brake system to the support system to provide motorized movement. The support system and movement system are configured to be collapsible to facilitate using the chair cot with an emergency vehicle. The chair cot further includes at least two platforms for supporting a patient in a seated position.
- These and other features and advantages of the present invention will be set forth or will become more fully apparent in the description that follows and in the appended claims. The features and advantages may be realized and obtained by means of the instruments and combinations particularly pointed out in the appended claims. Furthermore, the features and advantages of the invention may be learned by the practice of the invention or will be obvious from the description, as set forth hereinafter.
- The accompanying drawings illustrate various embodiments of the present invention and are a part of the specification. The illustrated embodiments are merely examples of the present invention and do not limit the scope of the invention.
-
FIG. 1A is a profile view of a chair cot in accordance with one embodiment of the present invention; -
FIG. 1B is a detailed view of the control system illustrated inFIG. 1A ; -
FIG. 1C is a detailed view of the collapsing mechanism attached to the arm rest illustrated inFIG. 1A ; -
FIG. 1D is a front view of the chair cot illustrated inFIG. 1A ; -
FIG. 2A is a profile view of an alternative embodiment of an expanded chair cot in accordance with the present invention; -
FIG. 2B is a profile view of the chair cot illustrated inFIG. 2A in a collapsed configuration; -
FIG. 2C is a front view of the expanded chair cot illustrated inFIG. 2A ; -
FIG. 2D is a perspective view of the expanded chair cot illustrated inFIG. 2A ; -
FIG. 3A is a perspective view of an alternative embodiment of an expanded chair cot in accordance with the present invention; -
FIG. 3B is a profile view of the expanded chair cot illustrated inFIG. 3A ; -
FIG. 3C is profile view of the chair cot illustrated inFIG. 3A in a collapsed configuration; -
FIG. 4 is a perspective view of an alternate embodiment of a chair cot in a collapsed position; -
FIG. 5 is a perspective view of the chair cot illustrated inFIG. 4 in an expanded position; -
FIG. 6 is a perspective view of the chair cot illustrated inFIG. 4 in an expanded position; -
FIG. 7 is a detailed perspective view of a hydraulic release element from the chair cot illustrated inFIG. 4 ; and -
FIGS. 8A-8E are plan and perspective views of an embodiment of a continuous track for use with embodiments of the present invention. - Reference will now be made to the drawings to describe embodiments of the invention. It is to be understood that the drawings are diagrammatic and schematic representations of the embodiments, and are not limiting of the present invention, nor are they necessarily drawn to scale.
- The present invention relates to a collapsible emergency vehicle chair cot that includes a support system and a movement system. The support system is a retractable system disposed on the bottom of the cot to support the chair cot during transportation. For example, one embodiment of a support system includes a track that extends from the bottom for the chair cot. The track supports the chair cot thereby minimizing the need for an emergency worker to manually support the chair cot during transportation. The movement system is coupled to the support system and utilizes rotational movement to assist in moving the chair cot over a surface. For example, one embodiment of a movement system includes coupling a motor system and a brake system to the support system to provide motorized movement. The support system and movement system are configured to be collapsible to facilitate using the chair cot with an emergency vehicle. The chair cot further includes at least two platforms for supporting a patient in a seated position. Also, while embodiments of the present invention are directed to emergency vehicle chair cots, it will be appreciated that the teachings of the present invention are applicable to other fields.
- The following terms are defined as follows:
- “chair cot”—a device for transporting an individual in a sitting position from one location to an emergency vehicle. A chair cot may be configured to interface with a gurney for use in a hospital.
- “gurney”—a wheelable bed device used in hospitals and other facilities to easily transport patients over flat surfaces.
- “emergency vehicle”13 any vehicle used to transport incapacitated individuals from one location to another including but not limited to ambulances, fire truck/engine, elderly car vehicles, helicopter, etc.
- “patient”—any person or animal being carried by a cot, including but not limited to individuals and animals that are sick, elderly, injured, deceased, etc.
- “emergency worker”—any individual who is responsible for moving an incapacitated individual from one location to an emergency vehicle, including but not limited to EMTs, firemen, ambulance drivers, doctors, paramedics, nurses, search and rescue, ski patrol, etc.
- Reference is initially made to
FIGS. 1A-1D , which illustrate various views of a chair cot in accordance with one embodiment of the present invention. The embodiment of the chair cot is designated generally at 100. Thechair cot 100 is configured to expand and collapse into two primary configurations. In the expanded configuration (FIGS. 1A and 1D ), a patient is able to be transported in a sitting position from one location to an emergency vehicle. In the collapsed configuration (not shown), thechair cot 100 can easily be stored in an emergency vehicle. The chair cot can be operated by a single emergency worker allowing a second emergency worker to perform medical functions on the patient. Thechair cot 100 generally includes twocontrol systems 150, aback support 110, anarm rest 105, aseat 115, afoot rest 120, and a support andmovement system 200. These components operate together to provide the functionality of thechair cot 100. - The
control systems 150 enable an emergency worker to operate thechair cot 100. This operation includes pushing, guiding, steering, and directing thechair cot 100 in the desired directions. In addition, thecontrol system 150 is configured to control the movement of thechair cot 100 through the use of a braking system. This allows an operator to slow the descent of thechair cot 100 down a decline. An identicalindependent control system 150 is located on either side of thechair cot 100, for explanation purposes only one system will be described. Thecontrol system 150 further includes ahandle 156, abrake attachment 158, abrake lever 162, apivotable arm 152, apivot bolt 160, and apivot bracket 154. Thehandle 156,brake attachment 158, andbrake lever 162 are all disposed on thepivotable arm 152 to allow for customization of thecontrol system 150. For example, in some situations an emergency worker may wish to push thechair cot 100 up an incline and a loweredpivot arm 152 is preferable. Likewise, when transferring thechair cot 100 over a level surface, a substantiallylevel pivot arm 152 may be optimal. The pivoting also allows thechair cot 100 to collapse. Thepivot arm 152 also includes apivot bolt 160 that extends through a hole in thepivot bracket 154. This allows thepivot arm 152 to pivot with respect to thepivot bracket 154. A locking pin and hole mechanism is also disposed on thepivot arm 152 andpivot bracket 154 to facilitate locking thepivot arm 152 in a particular configuration. Thebrake lever 162 is part of a braking system that is configured to slow and stop the rotational movement of the support andmovement system 200. - The
back support 110 is pivotally coupled to thecontrol system 150, thearm rest 105, and theseat 115. This pivotable coupling allows for thechair cot 100 to be collapsed. Various pivoting systems may be used and remain consistent with the present invention. Theback support 110 is configured to be positioned in a manner to provide support for a patient's back during transportation in a seated position. Likewise, thearm rest 105 is configured to provide support for a patient's arms during transportation and the seat is configured to provide lower support for a patient during transportation. Afoot rest 120 is also pivotally coupled to theseat 115 to provide additional patient transportation configurations. Theback support 110,arm rest 105, andseat 115 can be adjusted to various angles with respect to one another to create various seating configurations.FIG. 1C illustrates a pivoting mechanism between theback support 110 and thearm rest 105. Thearm rest 105 is coupled to apivot arm 107 that includes apivot bolt 109. Thepivot arm 107 is configured to rotate or pivot with respect to thepivot bolt 109. Thepivot bolt 109 is also coupled to thepivot bracket 112 which is coupled to theback support 110. A locking pin and hole system is also utilized to releasably lock thepivot arm 107 in a particular configuration with respect to thepivot bracket 112. Thepivot bracket 112 is coupled to theback support 110 as shown. - The support and
movement system 200 includes a support system that provides support for thechair cot 100 and a movement system that allows thechair cot 100 to utilize rotational movement during transportation. The illustrated support andmovement system 200 includes a V-shapedsupport bracket 205 coupled to adual track 210. Thedual track 210 acts like an elongated wheel to allow thechair cot 100 to translate utilizing rotational movement and support. Thedual track 210 incorporates a ribbed track to facilitate ascending and descending stepped and irregular surfaces. Thedual track 210 is configured to pivot or rotate with respect to the V-shapedbracket 205 to facilitate translation over irregular surfaces. - Reference is next made to
FIGS. 2A-2D , which illustrate various views of an alternative embodiment of a chair cot in accordance with the present invention. The embodiment of the chair cot is designated generally at 300. Thechair cot 300 is configured to expand and collapse into two primary configurations. In the expanded configuration (FIGS. 2A, 2C , and 2D), a patient is able to be transported in a sitting position from one location to an emergency vehicle. In the collapsed configuration (FIG. 2B ), thechair cot 300 can easily be stored in an emergency vehicle. The chair cot can be operated by a single emergency worker allowing a second emergency worker to perform medical functions on the patient. Thechair cot 300 generally includes twocontrol systems 350, aback support 310, aseat 315, afoot rest 320, and a support andmovement system 400. These components operate together to provide the functionality of thechair cot 400. - The
control systems 350 enable an emergency worker to operate thechair cot 300. This operation includes pushing, guiding, steering, and directing thechair cot 300 in the desired directions. An identicalindependent control system 350 is located on either side of thechair cot 300, for explanation purposes only one system will be described. Thecontrol system 350 further includes ahandle 356 and apivotable arm 352. Thehandle 156 is disposed on thepivotable arm 352 to allow for customization of thecontrol system 350. For example, in some situations an emergency worker may wish to push thechair cot 300 up an incline and a loweredpivot arm 352 is preferable. Likewise, when transferring thechair cot 300 over a level surface, a substantiallylevel pivot arm 352 may be optimal. The pivoting functionality also allows for thechair cot 300 to collapse as shown inFIG. 2B . Thepivot arm 352 includes a pivot bolt that extends through a hole in theback support 310. This allows thepivot arm 352 to pivot with respect to theback support 310. A locking pin and hole mechanism is also disposed on thepivot arm 352 andback support 310 to facilitate locking thepivot arm 352 in a particular configuration. - The
back support 310 is pivotally coupled to thecontrol system 350 and theseat 315. This pivotable coupling allows for thechair cot 300 to be collapsed. Various pivoting systems may be used and remain consistent with the present invention. Theback support 310 is configured to be positioned in a manner to provide support for a patient's back during transportation in a seated position. Likewise, the seat is configured to provide lower support for a patient during transportation. Afoot rest 320 is also pivotally coupled to theseat 315 to provide additional transportation configurations and foot support. In the illustrated embodiment, thefoot rest 320 further includes apivot bar 319 and asecond handle 322. Thepivot bar 319 provides additional support and stability to thefoot rest 320. Thesecond handle 322 is useful in transporting thechair cot 300 in the collapsed configuration, as shown inFIG. 2B . Theback support 310,seat 315, andfoot rest 320 can be adjusted to various angles with respect to one another to create various seating configurations. Theseat 315 further includes apivot arm 317 that utilizes a pivot bolt, pivot bracket, lock and pin type pivoting mechanism as described above. - The support and
movement system 400 includes a support system that provides support for thechair cot 300 and a movement system that allows thechair cot 300 to utilize rotational movement during transportation. The illustrated support andmovement system 400 includes a twosupport members 330, asupport bar 325, a twotrack attachments 405, and twotracks 410. Thesupport members 330 extend down from theback support 310 and are coupled to thetrack attachments 405. Thesupport bar 325 extends between thesupport members 330 to provide lateral support and stability. Thetrack attachments 405 are coupled to thetracks 410 in a manner to facilitate the rotational freedom of thetracks 410. Thetracks 410 act like elongated wheels to allow thechair cot 300 to translate utilizing rotational movement and support. Thetracks 410 each incorporate a ribbed track to facilitate ascending and descending stepped and irregular surfaces. Thetracks 410 are configured to pivot or rotate with respect to thesupport members 330 to facilitate translation over irregular surfaces. - Reference is next made to
FIGS. 3A-3C , which illustrate various views of an alternative embodiment of a chair cot in accordance with the present invention. The embodiment of the chair cot is designated generally at 500. Thechair cot 500 is configured to expand and collapse into two primary configurations. In the expanded configuration (FIGS. 3A and 3B ), a patient is able to be transported in a sitting position from one location to an emergency vehicle. In the collapsed configuration (FIG. 3C ), thechair cot 500 can easily be stored in an emergency vehicle. Thechair cot 500 can be operated by a single emergency worker allowing a second emergency worker to perform medical functions on the patient. Thechair cot 500 generally includes twocontrol systems 550, aback support 510, aseat 515, afoot rest 520, and a support andmovement system 600. These components operate together to provide the functionality of thechair cot 500. - The
control systems 550 enable an emergency worker to operate thechair cot 500. This operation includes pushing, guiding, steering, and directing thechair cot 500 in the desired directions. An identicalindependent control system 550 is located on either side of thechair cot 500, for explanation purposes only one system will be described. Thecontrol system 550 further includes ahandle 556 and apivotable arm 552. Thehandle 556 is disposed on thepivotable arm 552 to allow for customization of thecontrol system 550. For example, in some situations an emergency worker may wish to push thechair cot 500 up an incline and a loweredpivot arm 552 is preferable. Likewise, when transferring thechair cot 500 over a level surface, a substantiallylevel pivot arm 552 may be optimal. The pivoting functionality also allows for thechair cot 500 to collapse as shown inFIG. 3C . Thepivot arm 552 includes a pivot bolt that extends through a hole in theback support 510. This allows thepivot arm 552 to pivot with respect to theback support 510. A locking pin and hole mechanism is also disposed on thepivot arm 552 andback support 510 to facilitate locking thepivot arm 552 in a particular configuration. - The
back support 510 is pivotally coupled to thecontrol system 550 and theseat 515. This pivotable coupling allows for thechair cot 500 to be collapsed. Various pivoting systems may be used and remain consistent with the present invention. Theback support 510 is configured to be positioned in a manner to provide support for a patient's back during transportation in a seated position. Likewise, the seat is configured to provide lower support for a patient during transportation. Afoot rest 520 is also pivotally coupled to theseat 515 to provide additional transportation configurations and foot support. In the illustrated embodiment, thefoot rest 520 further includes apivot bar 519 and asecond handle 522. Thepivot bar 519 provides additional support and stability to thefoot rest 520. Thesecond handle 522 is useful in transporting thechair cot 500 in the collapsed configuration, as shown inFIG. 3C . Theback support 510,seat 515, andfoot rest 520 can be adjusted to various angles with respect to one another to create various seating configurations. Theseat 515 further includes a pivot arm 517 that utilizes a pivot bolt, pivot bracket, lock and pin type pivoting mechanism as described above. - The support and
movement system 600 includes a support system that provides support for thechair cot 500 and a movement system that allows thechair cot 500 to utilize rotational movement during transportation. The illustrated support andmovement system 600 includes a twosupport members 530, asupport bar 525, a twotrack attachments 605, and twotracks 610. Thesupport members 530 extend down from theback support 510 and are coupled to thetrack attachments 605. Thesupport bar 525 extends between thesupport members 530 to provide lateral support and stability. Thetrack attachments 605 are coupled to thetracks 610 in a manner to facilitate the rotational freedom of thetracks 610. Thetracks 610 act like elongated wheels to allow thechair cot 500 to translate utilizing rotational movement and support. Thetracks 610 each incorporate a ribbed track to facilitate ascending and descending stepped and irregular surfaces. Thetracks 610 are configured to pivot or rotate with respect to thesupport members 530 to facilitate translation over irregular surfaces. - The movement systems of each embodiment may further include a motor to rotate the tracks without external force. The motor may be an electric motor coupled to some form of rechargeable and/or replaceable power source, or it may be an electric motor coupled to some form of AC power, such as being plugged in to a wall outlet. The control systems of each embodiment may further include various motor controls to facilitate movement. The movement system must still conform to the dimensions of the chair cot embodiments such that it can be properly collapsed for transportation. When the movement systems include a motor, the control system may include a forward and reverse mechanism that allows the movement system to move forward and reverse respectively. Furthermore, the movement system may be designed to lock in the event that power is lost. Additionally, in some embodiments where the movement system includes a motor, a motorized portion of the movement system may be disengaged thereby allowing for descent and/or ascent of an inclined/declined surface utilizing non-motorized rotational movement.
- In operation, a chair cot in accordance with the present invention may be transported in a collapsed configuration to a patient in need of emergency services. The chair cot may then be expanded into the expanded configuration by locking various pivoting members into place. Adjustments to the pivotable angles may be made depending on the size and medical condition of the patient. The patient is then positioned in a seated position on the chair cot. The chair cot then utilizes rotational movement to transfer the patient to an emergency vehicle. The chair cot is then collapsed for storage within the emergency vehicle.
-
FIGS. 4-7 show perspective views of an alternate embodiment of a chair cot in accordance with the present invention. This embodiment of the chair cot is designated generally at 700. The illustrated embodiment of thechair cot 700 is capable of a large number of positions in between a fully expanded configuration and a fully-collapsed configuration. The fully-collapsed configuration is shown inFIG. 4 . As illustrated inFIG. 4 , thechair cot 700 generally includes one or more control systems (not shown), aback support 702, aseat 704, afoot rest 706, and a support andmovement system 708. These components operate together to provide functionality to thechair cot 700. In the fully-collapsed configuration shown inFIG. 4 , thechair cot 700 can easily be stored in an emergency vehicle. In any expanded configuration, a patient is able to be transported in a comfortable position from one location to an emergency vehicle. Thechair cot 700 may easily be operated by a single emergency worker. - The control system(s) (not shown) enable an emergency worker to operate the
chair cot 700. This may include pushing, guiding, steering, and directing thechair cot 700 in the desired directions on relatively flat terrain. In addition, the control system(s) may be configured to allow the emergency worker to control the movement of thechair cot 700 through the use of a braking system and through a powered track system. The control system(s) may be provided on ahandle 710 of thechair cot 700 and/or may be provided on theback support 702, on theseat 704, on the support andmovement system 708, and/or may be provided as a separate control unit. - The
back support 702 may be pivotally coupled to the support andmovement system 708 at a pivot joint 712 connected to the support andmovement system 708. The pivot joint 712 may allow theback support 702 to pivot through any position between the fully-collapsed position and the fully-expanded position, and may allow thepack support 702 to be positioned independently of theseat 704 andfoot rest 706. As may be seen more clearly inFIG. 6 , theback support 702 includes aback frame 714 pivotally coupled to the pivot joint 712 to which thehandle 710 is coupled. In some embodiments, theback frame 714 and handle 710 may be provided with an adjustable connection, such as a telescoping and/or a pivoting connection to allow adjustment of thehandle 710 relative to theback frame 714. - As may also be appreciated more fully by reference to
FIG. 6 , theback support 702 may also include across brace 716 passing through theback frame 714 at a location distal the connection of theback frame 714 to thepivot joint 712. Abracket 718 may be attached to the cross brace, and a pneumatic orhydraulic cylinder 720 may be attached to thebracket 718 and to the support andmovement system 708. The pneumatic orhydraulic cylinder 720 may be controlled by the control system(s) discussed above, or it may be controlled separately, such as by acontrol bar 722 attached to thebracket 718 and theback frame 714 so as to be easily reached by an emergency worker transporting a patient. This configuration allows theback support 702 to be positioned in any position between the fully-collapsed configuration and the fully-expanded configuration according to the transport needs and comfort of the patient being transported, as well as the storage needs of thechair cot 700 and the emergency worker and/or emergency vehicle. -
FIG. 7 shows a detailed perspective view of one embodiment of the connection between thebracket 718, the pneumatic orhydraulic cylinder 720, and thecontrol bar 722, to illustrate one way in which thecontrol bar 722 may function to control the pneumatic orhydraulic cylinder 720 to adjust the position of theback support 702. In the illustrated embodiment, thecontrol bar 722 may actuate the pneumatic orhydraulic cylinder 720 by a lateral movement (a movement in either direction along the long axis of the control bar 722). In the illustrated embodiment, abolt 724 connects thebracket 718 to the cross brace (not shown inFIG. 7 ). Thebracket 718 is connected to thecontrol bar 722 withrocker arms 726 that translate the lateral movement of thecontrol bar 722 into a pressing of arelease mechanism 728 on the pneumatic orhydraulic cylinder 720. When therelease mechanism 728 is pressed, the pneumatic orhydraulic cylinder 720 is allowed to move so as to position theback support 702 into a desired position. Then, when thecontrol bar 722 is returned to its normal position and therelease mechanism 728 is no longer pressed, the pneumatic orhydraulic cylinder 720 locks in place again to hold theback support 702 in the desired position. - As may be seen by reference to
FIGS. 4 and 5 , theseat 704 may also be provided with a pivot joint connection to the support andmovement system 708 as well as a pneumatic orhydraulic cylinder 730, abracket 732 and acontrol bar 734 similar to thehydraulic cylinder 720 andcontrol bar 722 provided for theback support 702. In this manner, theseat 704 may also be positioned at any position between a fully-collapsed configuration and a fully-expanded configuration. In some embodiments, for simplicity, theseat 704 and theback support 702 may utilize the same pivot joint location, namely the location of pivot joint 712. - The described combination of adjustability provides for improved patient support and comfort for a wide variety of patient needs, as well as transportation situations, such as various inclined surfaces, as will be discussed further below. Other embodiments of the
brackets control bars hydraulic cylinders hydraulic cylinders - In some embodiments, the
seat 704 may include aseat frame 736, as may be seen inFIG. 5 . Thefoot rest 706 may be connected to theseat frame 736 by alinkage 738. In some embodiments, thelinkage 738 may be a passive linkage so that thefoot rest 706 naturally rests in one of two configurations, a fully-folded configuration seen inFIG. 4 , and a fully-expanded configuration seen inFIG. 5 . In instances where theseat 704 has not been moved to an expanded-enough position to allow thefoot rest 706 to assume the fully-expanded configuration seen inFIG. 5 , thefoot rest 706 may naturally rest in as expanded a configuration as possible, with thefoot rest 706 resting on a portion of the support andmovement system 708. As illustrated inFIGS. 4-6 , thefoot rest 706 may have a roughly U-shaped configuration, and the patient's feet may naturally rest at the bottom of the U-shaped configuration during transport. During storage of thechair cot 700, thefoot rest 706 readily folds up in a compact fashion as shown inFIG. 4 . - In some embodiments, depending on the size of the patient and/or the angle of adjustment of the
seat 704 andback support 702, it may be advantageous to provide a separate place to support the feet of the patient being transported other than thefoot rest 706. Therefore, in some embodiments, the support andmovement system 708 may be provided with additional foot support structures (not shown) in locations convenient for supporting the patient' feet. In some embodiments, the additional foot support structures may be detachable structures and, in other embodiments, the additional foot support structures may be fixedly attached to the support andmovement system 708. One of skill in the art may readily appreciate the possible locations of the additional foot support structures, and will also recognize that the additional foot support structures should adequately shield patient' feet from any moving parts during transport. - In the configuration shown in
FIG. 4 , thechair cot 700 may be readily adapted for use as a spinal immobilization and transport device. As may be appreciated by reference toFIG. 4 , when thechair cot 700 is fully folded, thefoot rest 706 and theback frame 714 of theback support 702 may provide a coplanar surface that may be utilized to provide a spinal immobilization support surface. In some embodiments, thehandle 710 may be used and extended to further extend the coplanar surface supporting the immobilization surface. In this configuration, a separate, unitary rigid spinal immobilization surface (not shown) may be placed over and secured to thechair cot 700, and a patient may be immobilized for motorized or non-motorized transportation over horizontal and inclined/declined surfaces using straps (not shown) secured to theback frame 714, to theseat frame 736, thefoot rest 706, and/or the support andmovement system 708. In this way, thechair cot 700 may be used for at least three purposes, namely as a patient transport device with the patient transported in a sitting position, as a spinal immobilization and transport device with the patient transported in a reclined position, and as a inclined surface/stair ascending/descending device. - As discussed above, the
back support 702 and theseat 704 may include theback frame 714 and theseat frame 736. Each of theback frame 714, theseat frame 736, thehandle 710 and thefoot rest 706 may be manufactured from extruded aluminum to keep the weight of thechair cot 700 low while providing astrong chair cot 700 capable of supporting a wide range of patient weights. In other embodiments, some or all of these components may be manufactured from other materials such as tubular steel. Any combination of these materials and other materials may also be used. Any material that provides for the features discussed herein is embraced by the various embodiments of the invention. -
FIGS. 4-6 show an additional feature of thechair cot 700 that may be highly beneficial to emergency workers. Regulations affecting emergency workers generally provide that the emergency workers must provide patients to be transported with a clean surface for transport. This often requires a great deal of work for emergency workers after transporting a patient, as the emergency workers must wipe down and sanitize any surfaces with which the transported patient came in contact. This may be particularly onerous in cases where bodily fluids have come in contact with patient transport surfaces. It has historically been difficult for emergency transport companies to easily bill for the time the emergency workers spend cleaning patient transport surfaces and equipment. These problems are addressed by the embodiment of the invention shown inFIGS. 4-6 . - In the illustrated embodiment, the
back support 702 andseat 704 are provided with adisposable back surface 740 and adisposable seat surface 742, respectively. In other embodiments, fixed, reusable surfaces may also be used. Thedisposable back surface 740 and thedisposable seat surface 742 may be disposed after each use, and may therefore be charged to transported patients and/or their insurance companies as consumables/billables. As thedisposable back surface 740 anddisposable seat surface 742 are disposable, they may be made from any relatively inexpensive and sturdy material, such as plastics, with representative examples being corrugated or non-corrugated polypropylene, acrylonitrile butadiene styrene (ABS), and various kinds of polyethylene: ultra high molecular weight (UHMW) polyethylene, high density polyethylene (HDPE), and low density polyethylene (LDPE). When they are made from a material such as polypropylene, they may readily be customized for the particular emergency transport company with words and/or logos, such as by screen printing. - The
disposable back surface 740 and thedisposable seat surface 742 may be releasably but securely engaged to theback frame 714 andseat frame 736 during use. This may be provided in any number of manners or means for securing thedisposable back surface 740 and thedisposable seat surface 742 to thechair cot 700, such as by snaps, straps, hook-and-loop fasteners, etc., but in the embodiment illustrated inFIGS. 4-6 , the engagement is provided by indexingpins 744,indexing receptacles 746, andmagnets 747. In the illustrated embodiment, the indexing pins 744 are fixedly attached to or through thedisposable back surface 740 and thedisposable seat surface 742 and extend into the correspondingindexing receptacles 746 in theback frame 714 andseat frame 736. This prevents unwanted lateral movement of thedisposable back surface 740 and thedisposable seat surface 742 during use. - To secure the
disposable back surface 740 and thedisposable seat surface 742 to theback frame 714 and theseat frame 736 so that thedisposable back surface 740 and thedisposable seat surface 742 do not lift off and disengage the indexing pins 744 from theindexing receptacles 746, thedisposable back surface 740 and thedisposable seat surface 742 may be provided with magnets (not shown). The magnets may be either provided in thedisposable back surface 740 and thedisposable seat surface 742 and directly attracted to theback frame 714 and the seat frame 736 (when theback frame 714 and theseat frame 736 are made of magnetic materials) or may be attracted to correspondingmagnets 747 attached to or manufactured into theback frame 714 and theseat frame 736. Alternatively, inserts made from a magnetically-attractable material such as magnets (not shown), iron, or steel may be manufactured into thedisposable back surface 740 and thedisposable seat surface 742. In some embodiments, the inserts may be manufactured into thedisposable back surface 740 and thedisposable seat surface 742 so as to not be externally visible and to reduce the number of external surfaces needed to be sterilized. - In the illustrated embodiment, the indexing pins 744 are located on the
disposable seat surface 742 and thedisposable back surface 740 and theindexing receptacles 746 are located on theback frame 714 and theseat frame 736. However, in other embodiments, the indexing pins 744 may be located on theback frame 714 and theseat frame 736, and theindexing receptacles 746 may be located on thedisposable seat surface 742 and thedisposable back surface 740. This may reduce manufacturing costs, as the indexing receptacles may be manufactured into thedisposable back surface 740 and thedisposable seat surface 742 as simple holes, with or without reinforcements such as grommets. - Also shown in the illustrated embodiment, the
magnets 747 are located proximal the indexing pins 744 and theindexing receptacles 746 so as to better secure thedisposable back surface 740 and thedisposable seat surface 742 to theback frame 714 and to theseat frame 736 against any flexing that might occur during use of thechair cot 700. Although not specifically shown in the illustrated embodiment, thedisposable back surface 740 and thedisposable seat surface 742 may be manufactured so as to be sterilized and reusable. In embodiments where a corrugated material is used, thedisposable back surface 740 and thedisposable seat surface 742 may be made reusable by providing an edge trim (not shown) that prevents bodily fluids and other liquids or pathogens from entering the fluting of the corrugated material where it is more difficult to clean. Therefore, in such embodiments, thedisposable back surface 740 and thedisposable seat surface 742 may be reused a limited or unlimited number of times until it is determined that cleaning is no longer sufficiently effective or desired. - As may be appreciated from the above discussion, when the
chair cot 700 is used as a spinal immobilization and transport device, the indexing pins 744, theindexing receptacles 746, and themagnets 747 may be used to secure the removable spinal immobilization surface discussed above. As may be further appreciated, the spinal immobilization surface may therefore be a disposable spinal immobilization surface. In all such embodiments, thedisposable back surface 740 may be removed before the spinal immobilization surface, whether disposable or not, is attached. Also, in such embodiments, thefoot rest 706 may also be provided withindexing pins 744 orindexing receptacles 746 andmagnets 747 to better secure the spinal immobilization surface to thechair cot 700. As may be appreciated, thedisposable seat surface 742 may be removed or may remain in place, as it does not interfere with placement of the spinal immobilization surface. As may also be appreciated given the purpose of the spinal immobilization surface, the spinal immobilization surface, whether disposable or not, may be manufactured of a stronger and stiffer material (i.e. thicker material) in some embodiments to ensure full spinal immobilization. - Using the
disposable back surface 740 and the disposable seat surface 742 (and the disposable spinal immobilization surface) of the present invention, an emergency worker need not wipe down and sanitize thedisposable back surface 740 and thedisposable seat surface 742 of thechair cot 700 after each patient, but need merely remove and discard thedisposable back surface 740 and thedisposable seat surface 742. The emergency transportation company then can bill thedisposable back surface 740 and thedisposable seat surface 742 as a billable/consumable as part of its billing services. This provides a convenience and service to the emergency worker and the emergency transportation company. One of skill in the art will readily recognize the variety of uses to which such disposable surfaces can be put. - Disposable surfaces of the type described are not limited to use with chair cots such as described herein, but may be advantageously used for other medical uses and medical equipment, such as for gurneys, cots, or any other use where a disposable surface that can be replaced and billed as a consumable is desirable. For all such uses, it may be desirable that the disposable surface include at least one liquid impermeable layer to prevent the transmission of bodily fluids to underlying equipment. It may also be desirable to provide an absorbent layer to absorb any bodily or other fluids landing on the disposable surface. As above, the disposable surface may include a means for securing the disposable surface to a location or to underlying equipment, and the means for securing may include any means known in the art for reversibly securing the disposable surface, such as hook-and-loop fasteners, straps, snaps, screws, indexing pins and indexing pin receptacles, magnets, etc.
- In other embodiments, it may not be desirable to use disposable surfaces such as those described above. In those embodiments, the various support surfaces may be permanent or semi-permanent surfaces, and may be manufactured of any suitable long-lasting material, such as plastic. Examples of such materials include ABS plastic, HDPE, LDPE, UHMWPE, and polypropylene.
- Turning now to the support and
movement system 708 of thechair cot 700, the support andmovement system 708 of the illustrated embodiment is provided with features that facilitate movement of thechair cot 700 over level flat surfaces as well as over inclined surfaces, including stairs and other stepped and irregular surfaces, regardless of whether a patient is seated in thechair cot 700 and regardless of the size of the person seated in thechair cot 700. These features will be addressed in more detail. In the illustrated embodiment, the support andmovement system 708 includesdual tracks 748, amotor drive unit 750,casters 752, and retractablerear wheels 754. As discussed above, in some embodiments, additional support structures (not shown) may be provided in addition to thefoot rest 706. In some embodiments, thecasters 752 provide a convenient location for mounting the additional support structures to the support and movement system, as may be appreciated by reference toFIGS. 4 and 5 . Although not specifically illustrated in detail inFIGS. 4-6 , thedual tracks 748 may be ribbed tracks, as discussed further with reference toFIGS. 8A and 8B . - When the
chair cot 700 is deployed and used on a relatively flat and level surface, the retractablerear wheels 754 may be deployed as seen inFIGS. 5 and 6 . When the retractablerear wheels 754 are deployed, the rear end of thechair cot 700 is raised somewhat, lifting thedual tracks 748 off of the surface so that thecasters 752 engage the surface. Thus, in such a configuration, thechair cot 700 may be readily pushed or pulled in a desired direction by an emergency worker, and the emergency worker can readily steer thechair cot 700 using the rotation of thecasters 752. Although not specifically illustrated in the Figures, in one embodiment, thechair cot 700 may also be provided where thecasters 752 are replaced with fixed directional wheels and the retractablerear wheels 754 may be replaced with retractable rear casters. In such a manner, the chair cot may still be readily steered in use. - The
dual tracks 748 may be used on flat surfaces also, however. The use of thedual tracks 748 on flat surfaces may be desirable if the surface is uneven, or if the slope of the surface varies from flat to inclined. To use thedual tracks 748 instead of the retractablerear wheels 754 andcasters 752, the retractablerear wheels 754 are retracted to a stowed position. Thedual tracks 748 may be driven by themotor drive unit 750, which may include a high-efficiency motor and a power unit such as a battery. Thedual tracks 748 and themotor drive unit 750 may be controlled using the control system(s) (not shown) previously discussed above, and may provide relatively fast translation across varied surfaces. - The combination of the
dual tracks 748, thecasters 752, and the retractablerear wheels 754 provides for improved transport of patients up and down inclined and varied surfaces such as stairs, as well as improved transitioning from movement on a horizontal flat surface to a stairway and vice-versa, as will now be described. When thechair cot 700 is being used with thedual tracks 748 on a flat surface, transitioning to an inclined surface, such as a stairway, is straightforward: thechair cot 700 simply continues onto the inclined surface or stairway. If necessary to engage the first step or two when ascending a stairway, the operator might lift the rear end of thechair cot 700 slightly to allow thedual tracks 748 to engage the first step or two more readily. This engagement may be assisted by teeth or ribbing provided on thedual tracks 748 as discussed with reference toFIGS. 8A-8E . Additionally, as thechair cot 700 moves to or from an inclined surface, an operator may adjust the angle of theback support 702 and/orseat 704 as discussed previously for the comfort and safety of the patient. - When the
chair cot 700 has been or is desired to be used with thecasters 752 and the retractablerear wheels 754 on more-horizontal surfaces, it is advantageous to transition to using thedual tracks 748 for inclined surfaces such as stairways. This may be done by selectively stowing and deploying the retractablerear wheels 754 at the beginning and ending of the stairway, respectively, as follows. In all instances where a stairway is being ascended or descended, it may be desirable to lock the position of thecasters 752 and to lock therear wheels 754 in a stowed position to reduce the likelihood of accidents. Therefore, it is anticipated that the embodiments of thechair cot 700 are provided with means for locking the position of thecasters 752 and with means for locking therear wheels 754 in a stowed position during ascent and descent. - When a stairway is to be descended, the operator simply pushes the
chair cot 700 to the edge of the stairway and then pushes thecasters 752 of thechair cot 700 off the edge of the first step so that thedual tracks 748 contact the edge of the first step. At this point, the retractablerear wheels 754 still contact the flat surface at the top of the stairs. Thedual tracks 748 may then be activated so as to begin descending the stairs. As the descent begins, the operator may either slightly lift the rear end of thechair cot 700 or may allow the weight of thechair cot 700 to begin lifting the end of the chair cot 700 (as the center of gravity of thechair cot 700 passes over the lip of the first stair), and may then use a foot lever (not shown) or other release mechanism to retract/stow the retractablerear wheels 754 out of the way of the stairs. In the illustrated embodiment, the retractablerear wheels 754 retract/stow by rotating forward under thechair cot 700. If the operator discovers that thechair cot 700 has descended too far to allow retraction/stowing of the retractablerear wheels 754, the operator merely reverses the direction of travel of the chair cot 700 a slight amount until the retractablerear wheels 754 may be stowed. - At the bottom of the stairway, the
casters 752 naturally and automatically contact the horizontal surface first. The operator can continue using thedual tracks 748 all the way down the stairway (thus transitioning to use of thedual tracks 748 on the horizontal surface and discontinuing use of the casters 752), or the operator can lift the rear end of thechair cot 700 slightly (and may optionally activate a rear wheel release mechanism such as a foot petal or button) so as to allow the retractablerear wheels 754 to redeploy. In some embodiments, the retractablerear wheels 754 may be spring-loaded or otherwise biased so as to be automatically redeployed when the operator lifts the rear end of thechair cot 700. In such embodiments, the retractablerear wheels 754 do not deploy while descending the staircase as there is insufficient room on each step for the retractablerear wheels 754 to deploy. Instead, the retractablerear wheels 754 may move slightly from their fully-stowed position but on encountering the next step will merely roll over the step and will return to their fully-stowed position as the retractablerear wheels 754 pass over the corner of each step. In such embodiments, a lock may be optionally provided to lock the retractablerear wheels 754 in their fully-stowed position when desirable, such as where the pitch and spacing of the stairs would otherwise allow full deployment of the retractablerear wheels 754. - In other embodiments, a release or control such as a foot lever or button (not shown) may be used to redeploy the retractable
rear wheels 754 at the bottom of the stairway. Thus, regardless of the mechanism for stowing and redeploying the retractablerear wheels 754, the illustrated embodiment of thechair cot 700 allows for easy transition between controlled, powered movement down a stairway and controlled operator pushing/pulling of the chair cot on horizontal surfaces. Similar transitioning may be accomplished between travel on horizontal surfaces and controlled, powered movement up a stairway. - This may be accomplished by backing the chair cot up to the bottom of the stairs. At the bottom of the stairs, as may be appreciated by reference to
FIG. 5 , the retractablerear wheels 754 will contact the riser or tread of the first step of the stairway. At this point, the operator may continue pulling on the chair cot 700 (and may slightly lift the rear end of the chair cot 700), causing the retractablerear wheels 754 to be forced by the first step into their stowed position, with thedual tracks 748 resting on the first or second step of the stairway. Alternatively, a release or control such as a foot lever (not shown may be used to stow the retractablerear wheels 754. In another alternative embodiment, the retractable rear wheels may be provided with an automatic release that strikes the riser or tread of the first step and automatically releases/stows the retractablerear wheels 754 to allow thedual tracks 748 to engage the stairway. Regardless of the mechanism of stowing the retractablerear wheels 754, once thedual tracks 748 engage the stairway, themotor drive unit 750 may be engaged to power thechair cot 700 up the stairs to the top of the stairs. - At the top of the stairs, the retractable
rear wheels 754 may be redeployed manually or automatically, as discussed above for redeploying the retractablerear wheels 754 at the bottom of a stairway when descending the stairway. Thedual tracks 748 may then continue to be used to finish climbing the stairs until thecasters 752 are just over the lip of the stair, and a slight pull on thehandle 710 of thechair cot 700 will complete the transition back to non-powered rolling on thecasters 752 and retractablerear wheels 754 on the horizontal surface. Thus, one of skill in the art will readily appreciate that thechair cot 700 provides for simple and easy transitioning to climbing a stairway up or down from a horizontal surface and vice-versa. With minimal practice, an operator can make these transitions seamlessly and quickly, allowing for improved patient comfort as the patient is transported from a multi-story building in an emergency situation. - It is anticipated that the described embodiments of the support and
movement system 708 may be readily adopted to situations besides the emergency-use chair cot 700 described with reference toFIGS. 4-7 . While it may be readily recognized that thechair cot 700 may be used for home health and as a multi-story evacuation device, such as for nursing homes, the movement andsupport system 708 may be adapted for use in still other situations. For example, the support andmovement system 708 may be used as a base for a wheelchair. Additionally, the described support andmovement system 708 may be used as a home and garden transport platform. It has been found that the support andmovement system 708 can readily move a patient weighing more than 500 pounds (227 kilograms) up or down numerous flights of stairs on a single charge. As a home or garden transport platform, this means that a user could easily move the same weight of materials in similar fashion with very little effort on the part of a user. This may be practical and advantageous, for example, for deliveries, construction materials, and/or persons moving to/from an apartment in a multistory building. Thus, there are many potential uses for the described support andmovement system 708. - As discussed above, the
dual tracks 748 may be ribbed to improve security of thedual tracks 748 when ascending or descending irregular surfaces such as stairs. One embodiment of thedual tracks 748 is illustrated in more detail inFIGS. 8A and 8B .FIGS. 8A-8D illustrate a section of acontinuous track 756 used with each of thedual tracks 748. As may be seen by reference toFIG. 5 , thecontinuous track 756 forms a loop around adrive gear 758 andpulley 760. Thedrive gear 758 is connected to themotor drive unit 750 and provides power to thecontinuous track 756. Along the remainder of its length, thecontinuous track 756 may ride along a low-friction slider 762 that may be manufactured of a plastic such as UHMW polyethylene, HDPE, or LDPE. Use of the low-friction slider 762 has been found to improve efficiency of the support andmovement system 708, allowing the support andmovement system 708 to lift approximately 60% more weight up inclined surfaces such as stairways. - Returning now to
FIG. 8A , the Figure shows a plan view of a small section of thecontinuous track 756, showing one embodiment of the repeating profile of thecontinuous track 756. The illustrated section shown is from the bottom, surface-contacting portion of thecontinuous track 756, so the surface of thecontinuous track 756 that contacts the stairway or ground is downward inFIG. 8A . Thecontinuous track 756 shown has three layers: atread layer 764, afiber layer 766, and adrive layer 768. As shown inFIG. 8A , thetread layer 764 and thedrive layer 768 have teeth orribs 770 and teeth orribs 772, respectively. The teeth orribs 770 of thetread layer 764 engage stairs or other irregular surfaces being ascended or descended for security. The teeth orribs 770 may have a flattened top 774 to reduce wear by preventing a sharp-peaked top from being irregularly torn during use. The teeth orribs 772 of thedrive layer 768 engage thedrive gear 758 to transfer power from themotor drive unit 750 to thecontinuous track 756. The teeth orribs 772 may also engage a channel or guide in thedrive gear 758,pulley 760, and/orslider 762 to keep thecontinuous track 756 properly aligned during use, as may be appreciated by reference toFIGS. 8B and 8C , that show an embodiment of a channel 776 in thecontinuous track 756. - The
tread layer 764 and thedrive layer 768 may be manufactured from materials such as neoprene, urethane, rubber, and the like. In some embodiments, thetread layer 764 may have a durometer of between approximately 60A and 70A and in some embodiments a durometer of approximately 70A to provide softness and improved wear of thecontinuous track 756. This hardness of thetread layer 764 has proved to have an extremely long life during use and has proved useful for ascending or descending a large variety of stairway configurations. Thedrive layer 768 may have a higher durometer of between 80A and 55D or between 85A to 95A, and in some embodiments a durometer of approximately 90A to maintain flexibility but provide tooth strength for interaction with thedrive gear 758. - The
fiber layer 766 provides strength to thecontinuous track 756 and prevents undue expansion or stretching of thecontinuous track 756 when loaded. Thefiber layer 766 may include high-strength durable fibers such as steel fibers, polyesters, fiberglass, or long molecular chains of poly-paraphenylene terephthalamide produced from a condensation reaction between monomers of 1,4-phenylene-diamine (para-phenylenediamine) and terephthaloyl chloride, and commonly sold by E. I. du Pont de Nemours and Company as KEVLAR®. Thefiber layer 722 provides tensile strength to thecontinuous track 756 so that thecontinuous track 756 can withstand large tensile loads as thechair cot 700 is used to ascend or descend stairways. By way of example, and not limitation, the illustrated embodiment of thecontinuous track 756 can withstand between 100 and 2,000 inch/lbs of torque. - By way of example and not limitation, one embodiment of the
continuous track 756 will be illustrated with reference toFIG. 8E in specific detail. It is anticipated that one or more of the measurements discussed herein may be modified and still fall within the scope of the present invention. In the illustrated embodiment, thecontinuous track 756 may have a height of approximately 0.95-1.16 inches (24.1-29.5 mm) or between 1.05-1.06 inches (26.7-26.9 mm), as measured from the tip (i.e. the flattened top 774) of teeth orribs 770 to the tip of teeth orribs 772. This height may be varied for reasons of weight or strength of thecontinuous track 756. The teeth orribs 772 may have a tooth-to-tooth spacing of approximately 0.28-0.35 (7.1-8.9 mm) or 0.31-0.32 inches (7.9-8.1 mm) or of approximately 0.315 inches (8 mm), and with such a spacing, thedrive gear 758 andpulley 760 may have a diameter of approximately 4 inches (100 mm). As may be appreciated by one of skill in the art, varying the size and spacing of the teeth orribs 772 may permit or require varying the size of thedrive gear 758 andpulley 760 accordingly. - The teeth or
ribs 770 may have a tooth-to-tooth spacing of approximately 1.51-1.84 inches (38.4-46.7 mm) or of 1.67-1.68 inches (42.4-42.7 mm), or of approximately 1.675 inches (42.5 mm). The height of the teeth orribs 770 from avalley 778 to theflat top 774 may be approximately 0.54-0.66 inches (13.7-16.8 mm) or approximately 0.59-0.61 inches (15.0-15.5 mm) or approximately 0.6 inches (15.2 mm). These tooth-to-tooth spacings and teeth heights have been found to function well at securely climbing and/or descending a wide variety of stairway configurations, rises, runs, and step spacings. Thevalley 778 of the teeth orribs 770 may be provided with a curve, and the radius of curvature of thevalley 778 may be approximately 0.22-0.28 inches (5.6-7.1 mm) or approximately 0.25 inches (6.4 mm). As indicated previously, the teeth orribs 770 may be provided with the flattened top 774 to reduce wear, and the flattenedtop 774 may have a width of approximately 0.17-0.21 inches (4.3-5.3 mm) or approximately .19 inches (4.8 mm). - The present invention may be embodied in other specific forms without departing from its spirit of essential characteristics. The described embodiments are to be considered in all respects only as illustrative and not restrictive. The scope of the invention is, therefore, indicated by the appended claims, rather than by the foregoing description. All changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (21)
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US12/117,725 US20080272629A1 (en) | 2005-02-22 | 2008-05-08 | Folding Chair Cot for Use with Emergency Vehicles |
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WO2021260547A1 (en) * | 2020-06-25 | 2021-12-30 | Claudio Zonzini | Improved self-propelled stair climber |
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US8172238B2 (en) | 2004-09-20 | 2012-05-08 | Arc Products Llc | Lightweight plastic sleds for emergency transport and hauling of loads |
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US8333392B1 (en) | 2004-09-20 | 2012-12-18 | Wolf Bryan A | Lightweight plastic sleds for emergency transport and hauling of loads |
US8991835B1 (en) | 2004-09-20 | 2015-03-31 | Arc Products, Llc | Lightweight plastic sleds for emergency transport and hauling of loads |
US20080272629A1 (en) * | 2005-02-22 | 2008-11-06 | Walkingshaw Nathan R | Folding Chair Cot for Use with Emergency Vehicles |
US20090236380A1 (en) * | 2008-03-21 | 2009-09-24 | Adkins Clifford G | Infant carrier component for emergency evacuation sled |
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US20100117312A1 (en) * | 2008-08-29 | 2010-05-13 | Stryker Corporation | Motorized sled for stair chairs |
US8640798B2 (en) | 2008-08-29 | 2014-02-04 | Stryker Corporation | Motorized sled for stair chairs |
US9004204B2 (en) | 2008-08-29 | 2015-04-14 | Stryker Corporation | Motorized sled for stair chairs |
US20110025004A1 (en) * | 2009-07-31 | 2011-02-03 | Walkingshaw Nathan R | Molded and Stackable Evacuation Sled |
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US10406043B2 (en) | 2013-03-14 | 2019-09-10 | Stryker Corporation | Transport apparatus |
US9510981B2 (en) | 2013-03-14 | 2016-12-06 | Stryker Corporation | Reconfigurable transport apparatus |
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US20140259420A1 (en) * | 2013-03-14 | 2014-09-18 | Stryker Corporation | Reconfigurable patient support |
US10441483B2 (en) * | 2016-07-20 | 2019-10-15 | Stryker Corporation | Emergency patient motion system |
WO2018190709A1 (en) | 2017-04-13 | 2018-10-18 | Retter Helfer Medical B.V. | Device configured to transport a human body |
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