US20120174287A1

US20120174287A1 - Protective headgear assembly

Info

Publication number: US20120174287A1
Application number: US13/423,802
Authority: US
Inventors: Kenneth P. Lemke; James A. Piper; Mark Edward Miller; Daniel Ryan Somen
Original assignee: Sellstrom Manufacturing Co
Current assignee: Sellstrom Manufacturing Co
Priority date: 2007-02-01
Filing date: 2012-03-19
Publication date: 2012-07-12
Also published as: WO2008094320A1; US20080184451A1; US8161576B2

Abstract

The present invention generally relates to protective headgear worn by a user to protect his eyes, head, and face. More particularly, the present invention is directed to a protective headgear assembly used by welders and the like wherein a headgear strap can be tightened or loosened upon the ratcheting of a knob connected to the headgear strap. The headgear strap can also be automatically disengaged for removal of the headgear by pulling the knob away from the user's head.

Description

RELATED APPLICATIONS

This is a continuation of co-pending U.S. patent application Ser. No. 11/670,024 filed Feb. 1, 2007, entitled “Protective Headgear Assembly”.

FIELD OF THE INVENTION

The present invention generally relates to protective headgear worn by a user to protect his eyes, head, and face. More particularly, the present invention is directed to a protective headgear assembly used by welders wherein a headgear strap can be tightened or loosened upon the ratcheting of a knob connected to the headgear strap. The headgear strap can also be automatically loosened for removal of the headgear by pulling the knob away from the user's head.

BACKGROUND OF THE INVENTION

It has become commonplace for protective headgear to be worn while a user is undertaking a number of different activities. Frequently, there are safety-related laws or standards that require certain types of protective headgear to be worn, depending on the occupation or activity a user performs. Different types of protective headgear are generally known in the art. Certain activities, such as welding, require the wearing of protective headgear, i.e., a welding helmet, to protect the user's head, neck, face, and eyes. Other examples of protective headgear include bicycle helmets, motorcycle helmets, or helmets used during sporting activities.
Protective headgear used for different purposes can differ greatly in their design. Generally though, protective headgear will include: (1) a protective body, i.e., a helmet, to cover the user's head, (2) a type of headgear strap attached to the helmet to enable the headgear to remain on the user's head during use, and (3) a suspension system to separate the user's head from the helmet. Specifically with regard to welding, the user must also protect his eyes from dangerous sparks, heat, infrared and ultraviolet rays emitted when welding, while still remaining able to see in front of him. Accordingly, the protective headgear worn while welding further includes a face portion that acts to shield a user's face while allowing the user to see through the face portion to view his work. In addition, protective headgear worn while welding should enable the user to pivot the helmet portion of the headgear while the suspension system and headgear strap remain on the user's head.
The headgear strap is typically adjustable to enable the user to change the length of the strap to conform to the circumference of the user's head. An adjustable headgear strap allows the protective headgear to fit comfortably and securely during use, which is imperative during dangerous practices such as welding. The strap can be of closed loop formation, or utilize a type of ratchet mechanism that enables the length of the strap to be adjusted manually.
While ratchet mechanisms are generally known in the art and allow a user to manually loosen or tighten the headgear strap, none utilize a single mechanism that can allow for both adjustment of the size and fit of the headgear strap, and the ability to disengage the entire mechanism for automatic loosening of the headgear strap so that the protective headgear can be pulled off the user's head. Without a single quick-release mechanism, it can often be awkward and take needless time to ratchet the mechanism to loosen the headgear strap. Moreover, in the event of a need to remove the protective headgear quickly, such as in the event of an accident or other emergency, users, such as welders, should have a simple mechanism to free themselves of the oftentimes heavy and restrictive headgear.
There is a need to provide a protective headgear assembly with a headgear strap that can be easily adjusted for length to enable a user to be able to wear the protective headgear assembly securely.
There is also a need for a protective headgear assembly that can be removed in a simple, quick and efficient manner.
There is also a need for a protective headgear assembly wherein the helmet can pivot from a closed position (during use) to an open position (when not in use) while the headgear strap and suspension system remain in place on the user's head.
Accordingly, it is desirable to provide a protective headgear assembly wherein the headgear strap can be both adjusted for length and disengaged utilizing a single mechanism. By use of a single mechanism, a user can perform both actions in an easy and straightforward way.
It is also desirable to provide a protective headgear assembly wherein the helmet is capable of pivoting from a closed position (during use) to an open position (when not in use) while the headgear strap and suspension system remain in place on the user's head.
Thus, it is an object of the present invention to provide a protective headgear assembly which effectively addresses the aforementioned shortcomings associated with prior apparatuses of this general type, as well as to provide the above-mentioned desirable features.

SUMMARY OF THE INVENTION

The purpose and advantages of the present invention will be set forth in and apparent from the description that follows, as well as will be learned by practice of the invention. Additional advantages of the invention will be realized and attained by methods and systems particularly pointed out in the written description and claims thereof, as well as from the appended drawings.
The present invention is generally embodied in a protective headgear assembly. The protective headgear assembly may be utilized for any application wherein a user desires to protect his eyes, head and face. In particular, the present invention is directed to a protective headgear assembly used to protect a user's eyes, head and face during work procedures. For example, the protective headgear assembly can be used by welders to protect the welders' eyes, head and face during welding procedures.
In accordance with one embodiment of the present invention, the protective headgear assembly comprises a protective body, a headgear strap, and a quick-release ratchet mechanism. In the preferred embodiment, the protective body is a helmet. It will be appreciated that the protective body can also be a face shield.
The quick-release mechanism of the present invention comprises a gear system and an adjusting knob. The headgear strap fits around the circumference of a user's head in order to retain the protective headgear apparatus securely on the user's head. The quick-release mechanism is attached to the headgear strap and allows the user to: (1) manually adjust the length of the headgear strap, and (2) disengage the gear system in order for the user to automatically loosen the headgear strap and quickly take the protective headgear assembly off of his head. Specifically, the knob can be ratcheted clockwise or counterclockwise to adjust the length of the headgear strap to ensure a secure fit on the user's head. Turning the adjusting knob clockwise tightens the headgear strap and locks it to a selected size. Turning the knob counterclockwise loosens the headgear strap. In order for the user to disengage the gear system to unlock the selected size and allow for immediate headgear removal, the knob can be pulled away from the user's head. The same pulling action away from the user's head also can loosen the headgear strap to a selected size.
In another embodiment of the present invention, the protective headgear assembly further comprises an attaching assembly. In this embodiment, the helmet is attached to the headgear strap by means of attaching assemblies well known in the art, such as, e.g., as described in U.S. Pat. No. 4,479,738, the entire contents of which is hereby incorporated by reference herein.
In another embodiment of the present invention, the helmet can be attached to the headgear strap by means of a side-pivot device. The side-pivot device allows for the helmet to pivot from a closed position (during use) to an open position (when not in use) while the headgear strap remains in place on the operator's head. The side-pivot device limits the range of motion through which the helmet can pivot and also provides a positive dented stop at either end of the pivot path. The positive dented stops allow the helmet to rest in an open or closed position until adjusted by the user. The side-pivot device is distinctively a single piece that interacts with both the headgear strap and a pivot post that holds the device, strap and helmet together. It eliminates the need for a separate locking bolt. In addition, the headgear strap is able to accommodate the pivot device in two different positions. The positions move the helmet closer or farther from the front of the operator's head. The functionality of the pivot remains the same in either position.
In yet another embodiment of the present invention, the helmet can be attached to the headgear strap by means of a multi-position stop construction on a first side of the helmet and a detent cap construction on a second side of the helmet. In this embodiment, a five-position stop pivots with the helmet. The five-position stop limits travel of the helmet in both directions as it interacts with the headgear strap. The closed position (during use) of the helmet is determined by the interaction between the five-position stop and a pin located on the helmet. In the detent cap construction of this embodiment of the present invention, a washer key and detent cap interact and lock together to keep the helmet locked in an open (not in use) position. The washer key and detent cap are unlocked when the helmet is in the closed position.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and provided for purposes of explanation only, and are not restrictive of the invention, as claimed. Further features and objects of the present invention will become more fully apparent in the following description of the preferred embodiments and from the appended claims.
The accompanying drawings, which are incorporated in and constitute part of this specification, are included to illustrate and provide a further understanding of the method and system of the invention. Together with the description, the drawings serve to explain the principles of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

In describing the preferred embodiments, reference is made to the accompanying drawing figures wherein like parts have like reference numerals, and wherein:

FIG. 1 is a perspective view of the protective headgear assembly during use in accordance with the present invention;

FIG. 2 is an exploded perspective view of a quick-release mechanism made in accordance with the present invention;

FIG. 3 is a perspective view of the quick-release mechanism of FIG. 2;

FIG. 4 is a detailed view of the quick-release mechanism of FIG. 2, illustrating lateral movement of the overlapping ends of the headgear strap caused by rotation of the adjusting knob;

FIG. 5 is a detailed view of the quick-release mechanism of FIG. 2, illustrating movement of the overlapping ends caused by counterclockwise rotation of the adjusting knob;

FIG. 6 is a perspective view of the quick-release mechanism of FIG. 2, illustrating movement of the adjusting knob and disengagement of the gear system caused by the pulling of the adjusting knob;

FIG. 7 is a cut-away perspective view of the adjusting knob of the quick-release mechanism of FIG. 2 when the adjusting knob is pulled, illustrating the disengagement of the gear system;

FIG. 8 is an exploded perspective view of the multi-position stop construction made in accordance with the present invention;

FIG. 9 is a perspective view of the protective headgear assembly illustrating the five-position stop engaged with the pin affixed to the helmet;

FIG. 10 is an exploded perspective view of a detent cap construction made in accordance with the present invention;

FIG. 11 is a perspective view of the detent cap construction of FIG. 10, illustrating the washer key and the detent cap in a locked position;

FIG. 12 is a perspective view of detent cap construction of FIG. 10, illustrating the washer key and the detent cap in an unlocked position;

FIG. 13 is an enlarged view of a side-pivot device made in accordance with the present invention;

FIG. 14 is a perspective view of the side-pivot device of FIG. 13 connected to the headgear strap of the present invention;

FIG. 15 is a detailed view of the side-pivot device of FIG. 13 in an open (not in use) position;

FIG. 16 is a detailed view of the side-pivot device of FIG. 13 in a closed (during use) position;

FIG. 17 is a perspective view of the side-pivot device of FIG. 13 utilizing the front mounting hole of the headgear strap; and

FIG. 18 is a perspective view of the side-pivot device of FIG. 13 utilizing the back mounting hole of the headgear strap.

It should be understood that the present invention is not limited to the preferred embodiments illustrated.

DETAILED DESCRIPTION OF THE INVENTION

Referring generally to FIGS. 1-18, and upon review of this description, it will be appreciated that the apparatus of the present invention generally may be embodied within numerous configurations.
FIG. 1 is a perspective view of the protective headgear assembly 10 during use on a user's head. As shown in the preferred embodiment, the protective headgear assembly 10 generally includes: a helmet 15 to protect the user's head and eyes; a suspension system 12 to separate the user's head from the helmet; a headgear strap 20; and a quick-release mechanism 25. It will be appreciated that the helmet 15 can be any type of protective body that protects a user's head and eyes, including, e.g., a face shield. It will also be appreciated that the helmet 15 of the protective headgear assembly 10 can be made of any hard material that resists impact. For example, among other hard materials, the helmet 15 can be made of metal, plastic, or resin fiber. The headgear strap 20 extends around the circumference of the user's head and provides for a secure and comfortable fit depending on the user's manual adjustments. The quick-release mechanism 25 preferably is integral to the headgear strap 20 and lies at the back of the user's head during use.
Referring now to a preferred embodiment illustrated in FIGS. 2 and 3, the quick-release mechanism 25 comprises: (1) an adjusting knob 28 that enables a user to adjust the length of the headgear strap 20; (2) a housing 30 to define an internal cavity for receiving the headgear strap 20; and (3) a gear system 32 for manipulation of the length of the headgear strap 20. In this exemplary embodiment, the adjusting knob 28 has a first end 28 a and a second end 28 b. The first end 28 a provides a component that the user can manipulate to adjust the length of the headgear strap 20. The second end 28 b includes a cylindrical opening that receives a cylindrical covering 29 of the gear system 32. The cylindrical covering 29 is positioned on the exterior side of an outer housing section 30 a. The second end 28 b also comprises ratchet teeth (not shown) that engage ratchet teeth 29 a of the cylindrical covering 29. The outer housing section 30 a and an inner housing section 30 b join to form the housing 30, as shown in FIG. 3, and collectively define the internal cavity for receiving the headgear strap 20. It will be appreciated that the housing 30 can be arc-shaped to fit securely around the user's head. The quick-release mechanism 25 is preferably held together by means of a rivet pin 26 that enters through the first end 28 a of the adjusting knob 28. The pin 26 holds the knob 28 adjacent to a lock gear 34 with a spring 31 interspersed between.
In the preferred embodiment, as illustrated in FIG. 2, the gear system 32 of the quick-release mechanism 25 is comprised of a drive gear 33 and the lock gear 34. The drive gear 33 comprises two integral sides 33 a and 33 b. A first side 33 a of the drive gear 33 preferably has radially inward projecting teeth which cooperate with radially outward projecting teeth of the lock gear 34. A second side 33 b of the drive gear 33 preferably is a cog that engages two overlapping ends 20 a and 20 b of the headgear strap 20. The first end 20 a and second end 20 b of the headgear strap each include lateral slots 21, 22 that have gripping teeth formed along the periphery of each slot. The quick-release mechanism 25 further preferably comprises the spring 31 positioned within the cylindrical covering 29 which abuts a flange disposed on the cylindrical covering 29 on one end, and the lock gear 34 at the other end. The spring 31 biases the lock gear 34 into engagement with the inward projecting teeth of the first side 33 a of the drive gear 33
The ratchet teeth 29 a of the cylindrical covering 29 engaged with the ratchet teeth of the second side of the adjusting knob 28 b restrict movement of the adjusting knob 28 by means of the spring 31. The lock gear 34 is rigidly connected to the adjusting knob 28. Accordingly, manual turning of the adjusting knob 28 by a user (see FIG. 3) causes the gear system 32 to turn and engage the gripping teeth of the two lateral slots 21, 22 of the headgear strap 20, as shown in FIG. 4. Specifically, when the user turns the adjusting knob 28 clockwise, the first overlapping end 20 a and the second overlapping end 20 b of the headgear strap 20 move toward one another laterally to decrease the circumference of the headgear strap 20. Similarly, as shown in FIG. 5, when the user turns the adjusting knob 28 counterclockwise, the first overlapping end 20 a and the second overlapping end 20 b move away from one another laterally to increase the circumference of the headgear strap 20. The user must overcome sufficient torque provided by the spring 31 on the adjusting knob 28 in order to once again change the selected size of the headgear strap 20. The gripping teeth of the two lateral slots 21, 22 of the headgear strap 20 allow for incremental tightening of the headgear strap 20. The user is accordingly able to adjust the headgear strap 20 so as to have a secure fit around his head. Once the user stops turning the adjusting knob 28 in either direction, the ratchet teeth 29 a of the cylindrical covering 29 engaged with the ratchet teeth of the second side of the adjusting knob 28 b prevents lateral movement of the overlapping ends 20 a, 20 b of the headgear strap 20 and therefore locks the headgear strap 20 into a selected size and fit around the user's head.
Referring now to a preferred embodiment in FIGS. 6 and 7, the adjusting knob 28 of the quick-release mechanism 25 can further be manually pulled in a direction away from the housing 30 to disengage the gear system 32. When a user pulls the adjusting knob 28 in a direction away from the user's head, the lock gear 34 is forced to separate from the drive gear 33, causing the drive gear 33 to be able to freely rotate and unlock the headgear strap 20 from the selected size. As a result, the first overlapping end 20 a and the second overlapping end 20 b of the headgear strap 20 are able to move away from one another without any ratcheting of the adjusting knob 28. The user can simply pull the protective headgear assembly 10 off of his head.
It will be appreciated that various attachment means can be employed to affix the headgear strap 20 to the helmet 15. Referring now to a preferred embodiment in FIGS. 8-10, the protective headgear assembly 10 comprises a multi-position stop construction 40 on a first side of the helmet 15, and a detent cap construction 50 on a second side of the helmet 15. As shown in FIGS. 8 and 9, the multi-position stop construction 40 comprises a knob 41, a washer 42, a washer key 43, and a five-position stop 44, all connected to the headgear strap 20 by means of a pivot post 45. The five-pivot stop 44 comprises five adjustment holes 44 a and pivots with the helmet 15. It will be appreciated that any number of adjustment holes 44 a can be used in accordance with the present invention. The adjustment holes 44 a determine the position of the helmet 15 with respect to the suspension system 12 and headgear strap 20. A pin 46 is affixed to the helmet in order to receive an adjustment hole 44 a. The helmet 15 can be positioned closer or farther from the face of the user depending on the placement of the pin 46 into an adjustment hole 44 a.
As shown in FIG. 10, the detent cap construction 50 on the second side of the helmet 15 comprises a knob 51, a washer 52, a washer key 53, and a detent cap 54, all connected to the headgear strap 20 by means of a pivot post 55. The detent cap 54 is preferably comprised of at least one notch that matches and interacts with at least one notch on the washer key 53. The washer key 53 and the detent cap 54 rotate relative to each other. In order to lock the helmet 15 into an open position, the user lifts the helmet 15 until the washer key 53 and the detent cap 54 lock together, as shown in FIG. 11. The user must overcome the force necessary to unlock the washer key 53 and the detent cap 54 by pulling the helmet 15 down into a closed position, see FIG. 12.
Referring now to an alternative embodiment illustrated in FIGS. 13-18, it will be appreciated that the helmet 15 of the present invention can also be attached to the headgear strap 20 by means of a side-pivot device 60, a pivot post 64, and a knob 65. As shown in FIGS. 15 and 16, the side-pivot device 60 comprises a pair of spring arms 60 a, 60 b that interact with a series of pins 61 on the headgear strap 20 to provide a dented stop at either end of the pivot path. The spring arms 60 a, 60 b restrain the helmet 15 in either an open (not in use) position (see FIG. 15), or a closed (in use) position (see FIG. 16) until adjusted by the user. Further, as shown in FIGS. 17 and 18, in this alternative embodiment, the headgear strap 20 can accommodate the side-pivot device 60 in two different positions by means of a pair of mounting holes 62, 63. The mounting holes 62, 63 are provided on the headgear strap 20 so that the helmet 15 may be selectively positioned closer or farther from the front of the user's face. For example, FIG. 17 illustrates the side-pivot device 60 attached to the headgear strap 20 by means of the pivot post 64 received through the front mounting hole 62 of the headgear strap 20, thereby positioning the helmet 15 farther in front of the operator's head than if the side-pivot device 60 was affixed to the back mounting hole 63 (see FIG. 18). The functionality of the side-pivot device 60 remains the same in either position.
It should be appreciated that merely preferred embodiments of the invention have been described above. However, many modifications and variations to the preferred embodiments will be apparent to those skilled in the art, which will be within the spirit and scope of the invention. Therefore, the invention should not be limited to the described embodiments. To ascertain the full scope of the invention, the following claims should be referenced.

Claims

1. A quick-release system for changing the circumference of a headgear strap comprising:

a gear system rotatable about a central axis comprising a drive gear and a lock gear, said lock gear interacting with said drive gear whereby said gear system operates in a first state and in a second state, said gear system configured such that in said first state said lock gear is engaged with said drive gear and in said second state said lock gear is disengaged from said drive gear;

a knob capable of movement along said central axis and operably connected to said lock gear; and

a spring biasing said knob such that said gear system is biased to said first state but allows said gear system to be moved to said second state through movement of said knob along said central axis.

2. The quick-release system of claim 1 wherein said movement of said knob along said central axis is substantially linear and away from said drive gear.

3. The quick release system of claim 1 further comprising a ratchet assembly operably connected to and fixed relative to said drive gear and provides resistance to rotation of said knob about said central axis and fixed substantially concentrically about said central axis.

4. The quick release system of claim 1 wherein rotation of said drive gear about said central axis changes the circumference of the headgear strap.

5. The quick release system of claim 1 wherein the spring is located between the lock gear and the ratchet system.

6. The quick release system of claim 1 further comprising a cylindrical portion of an outer housing, said cylindrical portion having walls and a top defining a cavity in which said gear system resides, said walls and top restricting movement of said lock gear between the first state and the second state.

7. The quick release system of claim 1 wherein said drive gear, said lock gear rotate about said central axis in response to rotation of said knob when said system in the first state.

8. A device for varying a circumference of a headgear strap, said device comprising:

an adjustment knob; and

a housing comprising an inner housing section, an outer housing section, and a gear mechanism, said outer housing section defining a cavity containing said gear mechanism and capable of connection to said inner housing section to surround a portion of said headgear strap;

wherein said gear mechanism is operable to repeatedly engage and disengage from said headgear strap to vary and maintain the circumference of the headgear strap.

9. The device of claim 8 wherein the adjustment knob is attached to said gear mechanism through an opening in said outer housing section.

10. The device of claim 8 wherein the cavity of said outer housing section is defined by a cylindrical portion extending away from said inner housing section.

11. A headgear strap attachment for fastening a piece of protective headgear to a strap, said attachment comprising:

a pivot post and handle, said pivot post extending through an opening in said piece of headgear and removably coupling with said handle to retain said piece of headgear to said strap; and

a side pivot device comprising a first adjustment portion and a second adjustment portion; said first adjustment portion including a plurality of holes that interact with a first pin on said piece of headgear; and said second adjustment portion including a pair of spring arms that interact with a second pin on said strap to restrain the piece of headgear in an open or closed position.

12. The headgear strap of claim 11 further comprising a plurality of mounting holes for further adjustment of the piece of headgear.

13. A head strap for use in conjunction with a piece of protective headgear comprising:

a quick release mechanism comprising:

a spring biasing said knob such that said gear system is biased to said first state but allows said gear system to be moved to said second state through movement of said knob along said central axis; and

a strap attachment comprising: