CA2608430A1 - Improved reel and reel housing - Google Patents

Abstract

A reel (10) includes a reel drum (20) enclosed within a housing (11) comprising a first housing portion (12), a second housing portion (14), and a middle housing portion (16) positioned therebetween. A spindle member (22) has a first end (24) connected to the first housing portion (12) and a second end (26) connected to the second housing portion (14). The spindle member (22) extends through an opening (28) in the drum (20) so that the drum (20) is rotatable about a spindle axis defined by the spindle member (22). The middle housing portion (16) encircles the drum (20) and has an aperture (15) through which linear material (2) can extend, the linear material (2) of a type that may be spooled on the drum (20). The middle housing portion (16) is rotatable about the spindle axis independently of the drum (20). In preferred embodiments, the reel (10) is a cord reel and the linear material (2) is electrical cord. In preferred embodiments, the middle housing portion (16) is rotatable at least 360o about the spindle axis. In preferred embodiments, the drum (20) is powered by an electric motor (51). In preferred embodiments, the housing (11) is substantially spherical and the reel (10) further comprises one or more support structures (18, 19) that include handles (38) and are configured to prevent the housing (11) from contacting a flat surface such as a floor or wall. In preferred embodiments, one or more temperature-sensitive switches (102, 102A, 102B) are configured to shut off power to a spooled electrical cord (2) in the event that a temperature of the reel (10) exceeds a given threshold. In preferred embodiments, a solenoid (62) is provided for locking the middle housing portion (16) with respect to the first and second housing portions (12, 14) while the motor (51) is rotating in a direction to spool the linear material (2) onto the drum (20).

Description

IMPROVED REEL AND REEL HOUSING

Claim for Priority [0001] This application claims priority to U.S. Provisional Patent Application Serial No. 60/686,236, filed May 31, 2005.

Incorporation by Reference [0002] This application incorporates by reference the full disclosures of U.S.
Provisional Patent Application Serial No. 60/585,042, filed July 2, 2004, entitled "SYSTEM AND METHOD FOR AUTOMATICALLY CONTROLLING SPOOLING
OF LINEAR MATERIAL;" U.S. Patent Application Publication No. US 2004/0231723 Al, entitled "REMOTE CONTROL FOR HOSE OPERATION;" and U.S. Patent Application Publication No. 2004/0206849 Al, entitled "REEL HAVING APPARATUS
FOR IMPROVED CONNECTION OF LINEAR MATERIAL."

Background of the Invention Field of the Invention [0003] The invention relates generally to reels for spooling linear material and specifically to reels enclosed within housings.

Description of the Related Art [0004] A reel typically coinprises a cylindrical reel druin onto which a flexible linear material (such as cord, hose, etc.) is spooled. The drum ordinarily rotates about a central axis to wind or unwind (also referred to herein as spooling and unspooling) the linear material with respect to the cylindrical drum surface. Some reels include liousings that protect the drum and spooled linear material from the enviroinnent. The housing may include an opening or aperture through which the linear material extends, so that it may be pulled fiom the housing and subsequently retracted back into the housing.

[0005] Some reel housings have a portion that includes the linear material aperture and is movable with respect to the remainder of the housing, thereby perinitting a user to change the position from wliich tlhe linear material is pulled from the reel. For example, U.S. Patent No. 6,279,848 to Mead discloses a cylindrical reel drtun that rotates about a horizontal axis and is enclosed within a spherical housing comprising upper and lower semispherical shell portions. The upper shell portion includes a guide aperture for the spooled linear material and is linlced to the drum. The upper shell portion and drum together rotate about a vertical central axis witlz respect to the lower shell portion. This pennits a user to pull the linear material out of the housing through the guide aperture, and move around the reel with the guide aperture following the radial position of the user.
The upper shell portion and drum form a unit that is freely rotatable (about the vertical axis) with respect to the lower shell portion, through 360 and more.

[0006] A variety of electrical cord reels include spring return mechanisms for autoinatically spooling the linear material. Typically, a coil of flat spring steel stock is provided with one end secured to the reel drum and the other end secured to a spindle on which the druin rotates. For example, U.S. Patent No. 6,273,354 to Kovacik et al.
discloses such a reel. Such reels are often provided with a ratchet and pawl mechanism (or similar apparatus) for permitting the user to initiate rewinding of the reel by a sliglit tug on the linear material.

Summary of the Invention [0007] hl one aspect, the invention provides a reel comprising first, second, and middle housing portions, a drum onto wliich a linear material can be spooled, and a spindle ineinber having a first end connected to the first housing portion and a second end connected to the second housing portion. The spindle member extends through an opening in the drum so that the drum is rotatable about a spindle axis defined by the spindle member. The middle housing portion encircles the druin and is positioned between the first and second housing portions. The middle housing portion has an aperture through which linear material can extend, and is rotatable about the spindle axis independently of the drtim. The first, second, and middle housing portions collectively fonn a housing for the drum.

[0008] hl another aspect, the invention provides a reel comprising first, second, and niiddle housing portions, a dnim onto wlzich a linear material can be spooled, an elongated spindle member, and one or more support stntctures secured to at least one of the housing portions. The spindle inenlber has a first end coiuiected to the first housing portion and a second end connected to the second housing portion. The spindle meniber extends tlirough an opening in the drum so that the ditiun is rotatable about a spindle axis defined by the spindle member. The middle housing portion encircles the drum and is positioned between the first and second housing portions. The middle housing portion has an aperture through whicll linear material can extend, and is rotatable about the spindle axis independently of the drum. The one or more support structures are configured to prevent the housing portions from contacting a generally planar support surface regardless of the orientation of the reel.

[0009] In another aspect, the invention provides a reel comprising a drum onto which a linear material can be spooled, first, second, and middle llousing portions, a spindle member having a first end connected to the first housing portion and a second end connected to the second housing portion, a motor, and a solenoid. The spindle member extends through an opening in the drum so that the druin is rotatable about a spindle axis defined by the spindle member. The middle housing portion encircles the drum and is positioned between the first and second housing portions. The middle housing portion has an aperture through which linear material can extend, and is rotatable about the spindle axis independently of the drum. The motor is configured to produce rotation of the drum in a first direction for spooling linear material onto the drum, and a second direction opposite the first direction for unspooling linear material from the drum. The solenoid has a first position in which the solenoid restricts rotation of the iniddle housing portion witli respect to the first housing portion, and a second position in which the solenoid does not restrict rotation of the middle housing portion. The solenoid is configured to move to the first position wllen the motor causes the drum to rotate in the first direction.

[0010] In another aspect, the invention provides a reel coinprising a drtun onto which an electrical cord can be spooled, a power coiulector on the drum for connection to the cord, first and second housing portions, a spindle member, one or more switches, and a middle housing portion encircling the drum and positioned between the first and second housing portions. The spindle member has a first end connected to the first housing portion and a second end comnected to the second housing portion, the spindle member extending through an opening in the druin so that the druin is rotatable about a spindle axis defined by the spindle member. The middle housing portion has an aperhire througli which linear material can extend. The middle housing portion is rotatable about the spindle axis independently of the drum. The one or more switches are configured to sense a temperature of the reel and shut off electrical power supplied to the power coiulector in response to detecting a temperature that exceeds a threshold.

[0011] In still another aspect, the invention provides a inethod of reeling linear material, comprising providing a spool of linear material on a druin;
providing first and second housing portions; rotating the drum about a spindle axis defmed by a spindle member having a first end connected to the first housing portion and a second end connected to the second liousing portion, the spindle member extending through an opening in the drum; providing a middle housing portion between the first and second housing portions, the middle housing portion having an aperture through which the linear material extends, the first, second, and iniddle housing portions collectively forming a housing for the drum; rotating the middle housing portion independently of the druin about the spindle axis.

[0012] In still another aspect, the invention provides an apparatus for inounting to a reel housing having a ph.irality of housing portions that collectively surround a reel drum, the apparatus coinprising first and second support structures. The first support structure is configured to inount to a lower housing portion of the reel housing. The first support structure coinprises two elongated handle portions configured to be positioned generally on opposing sides of the lower housing portion. The first support structure is configured to support the reel housing on a lower generally flat support surface. The second support structure is configured to mount to an upper housing portion of the reel housing. The second support stntcture coinprises two elongated handle portions configured to be positioned generally on opposing sides of the upper housing portion. The second support structure is configured to support the reel housing on a lower generally flat support surface when the reel housing is upside down. The first and second support structures are configured to prevent the reel housing from contacting a generally flat surface regardless of the orientation of the reel housing.

[0013] For purposes of suinmarizing the invention and the advantages acliieved over the prior art, certain objects and advantages of the invention have been described above and as further described below. Of course, it is to be understood that not necessarily all such objects or advantages may be achieved in accordance with any particular embodiment of the invention. Thus, for example, those skilled in the art will recognize that the invention may be embodied or caiTied out in a manner that achieves or optimizes one advantage or group of advantages as taught herein without necessarily achieving other objects or advantages as may be taught or suggested herein.

[0014] All of these embodiments are intended to be witllin the scope of the invention herein disclosed. These and other embodiments of the present invention will become readily apparent to those slcilled in the art from the following detailed description of the preferred embodiments having reference,to the attached figures, the invention not being limited to any particular preferred einbodiment(s) disclosed.

Brief Description of the Drawings [0015] Figure 1 is a perspective view of a reel according to one embodiment of the present invention.

[0016] Figure 2 is an exploded top perspective view of the reel of Figure 1.

[0017] Figure 3 is an exploded bottom perspective view of the reel of Figure 1.

[0018] Figure 3A is an expanded view of a portion of Figure 3, showing the bottom of the drum.

[0019] Figure 4 is a top perspective view of the reel of Figure 1, with the upper housing portion removed.

[0020] Figure 5 is a top perspective view of the reel of Figure 1, with the upper and middle housing portions removed.

[0021] Figure 6 is a top perspective view of the lower housing portion of the reel of Figure 1.

[0022] Figure 7 is a bottom perspective view of the reel of Figure 1, with most of the lower housing portion not shown.

[0023] Figure 8 is a bottom perspective view of the druin of the reel of Figure 1.

[0024] Figure 9 is a top perspective view of the druin of the reel of Figure 1.

[0025] Figure 10 is a perspective view of a reel housing according to another einbodiment of the present invention.

[0026] Figure 11 is a top perspective view of a reel according to another embodinient of the present invention, engaged wit11 a nlounting eleinent to secure the reel to a wall.

[0027] Figure 12 is a top perspective view of the reel and mounting element of Figure 11, with the mounting element engaged to secure the reel to a ceiling.

[0028] Figure 13 is an electrical power flow diagrain illustrating the use of a teinperature regulation system in a reel of the present invention.

Detailed Description of the Preferred Embodiments [0029] Embodiments of the present invention provide a reel comprising a reel drum enclosed within a housing having a portion with a guide aperture for receiving and guiding spooled linear material, wherein the guide aperture housing portion is rotatable about the same axis of rotation of the drum, and wllerein the drum and guide aperture housing portion are independently rotatable. hl preferred embodiments, the guide aperture housing portion is freely rotatable through at least 360 with respect to a remainder of the housing.

[0030] Figure 1 shows a reel 10 according to one einbodiment of the present invention. The reel 10 comprises a housing 11 enclosing a rotatable reel drum (Figures 2, 3, 5, 8, and 9) onto which a flexible linear material 2 can be spooled. In the ilh.istrated embodiment, the linear material 2 coinprises an electrical cord with a female plug connector 3, as known in the art. The housing 11 coinprises a first or lower housing portion 12, a second or upper housing portion 14, and a middle housing portion interposed therebetween. In the illustrated embodiment, the housing portions 12, 14, and 16 collectively fonn a substantially spherical shape. However, the housing 11 can have other shapes, giving due consideration to the goal of collectively substantially surrounding and preferably enclosing the drum 20. The reel 10 also includes a first or lower support sti-ucture 18 mounted to the lower housing portion 12, as well as a second or upper support structure 19 mounted to the upper housing portion 14. The lower support structure 18 is configured to support the reel 10 on a lower support surface.
In a preferred embodiment, the reel is capable of operating upside down, and the upper support structure 19 is also configured to support the reel 10 on a lower support surface. As explained in fiirther detail below, the middle housing portion 16 includes an aperture 15 through which the linear material 2 can extend.

[0031] As mentioned above, in a prefeiTed einbodiinent the reel 10 is adapted to spool electrical cord 2 and provide electrical power to the cord from an extenlal electrical power outlet. In the embodiment of Figure 1, the reel 10 includes an electrical cable 13 that extends out of a lower opening (not shown) of the lower h.ousing portion 12.
The cable 13 preferably includes a standard electrical plug 17 that is adapted to plug into a standard electrical power outlet. The cable 13 preferably provides power to the electrical cord 2 spooled on the reel 10. While the illustrated connectors 3 and 17 are respectively feinale and male, these "genders" can be reversed.

[0032] Figures 2 and 3 are exploded top and bottom views, respectively, of the reel 10. The reel 10 includes a spindle meinber 22 having a first end 24 and a second end 26 (Figure 4). The first end 24 is coimected to, and preferably integrally formed with, the lower housing portion 12. In this embodiment, the spindle member 22 is configured to extend througll an opening 28 (Figures 8 and 9) in the drum 20 so that the drum is rotatable about a spindle axis defined by the spindle member. Preferably, the opening 28 is sized to closely receive the spindle member 22. The spindle member 22 is also configured to extend through an opening 30 (Figure 4) of the middle housing portion 16.
Preferably, the opeiiing 30 is sized to closely receive the spindle member 22.
Iii one einbodiment, the spindle member 22 has a lower larger diameter portion for a close fit with the opening 28 of the drum 20, and an upper smaller diameter portion for a close fit witli the opening 30 of the middle housing portion 16, it being understood that the opening 28 is larger than the opening 30. In another embodiment, the openings 28 and 30 are approximately the same size, and the spindle meinber 22 has a substantially uniform diaineter. Slcilled artisans will appreciate that otller configurations of the spindle member 22 and openings 28 and 30 are possible, keeping in inind the goal of permitting both the middle housing portion 16 and drum 20 to rotate with respect to the spindle member 22 and independently with respect to each other.

[0033] With reference to Figures 2-4, the upper housing portion 14 is preferably adapted to comlect to the second end 26 of the spindle member 22 when the ineinber 22 extends through the druin 20. Preferably, the upper housing portion 14 and the spindle member 22 are detachably secured to one anotller so that they caiulot rotate wit11 respect to each other. In the illustrated einbodiment, the upper housing portion 14 includes four through-holes 32 sized and configured to receive screws 34 (Figure 4) that are in turn adapted to screw into threaded holes 36 in the second end 26 of the spindle meinber 22. Skilled artisans will appreciate that any of a wide variety of ineans can be einployed for detachably securing the upper housing por-tion 14 to the spindle meinber 22.

[0034] The reel 10 thus pennits the middle housing portion 16 and drum 20 to rotate freely about the spindle ineinber 22 and independently witll respect to each other.
In order to assist or facilitate the rotation of the drum 20 and/or middle housing portion 16, rotation-assistance elernents sucll as ball bearings, rollers, and the like may (but need not) be provided at interfaces between the housing portions 12 and 16, between the housing portions 14 and 16, between the middle housing portion 16 and the druin 20, between the lower housing portion 12 and the druin 20, between the spindle member 22 and the drum 20, and/or between the spindle member 22 and the middle housing portion 16. Also, tracks or other guide means can be provided to control the relative inovement of these members. Lubricants can also be used to reduce friction at these interfaces.

[0035] With continued reference to Figures 2 and 3, each of the upper and lower housing portions 12, 14 preferably includes an aiulular wall 39 and a plurality of radial ribs 37 for added strengtli. Alternative configurations for intenlal walls and ribs are also possible, keeping in mind the goal of iinproving the strength and rigidity of the housing portions 12, 14. In other embodiments, the housing portions 12 and 14 do not have any intenlal members for added strength.

[0036] Iii the disclosed einbodiments, the upper and lower support structures 18 and 19 are (but need not be) substantially similar. Accordingly, only the lower support structure 18 is described in detail herein. With reference to Figures 2 and 3, the lower support structure 18 preferably comprises two mounting portions 40 and two handle portions 38. The illustrated mounting portions 40 coinprise elongated tubular meinbers that are configured to be mounted on opposing sides of the lower housing portion 12.
Skilled artisans will appreciate that the moullting portions 40 can alternatively have non-tubular shapes. lii a preferred einbodiment, the lower izousing portion 12 includes recesses 42 that are sized and shaped to receive the mounting portions 40. The mounting portions 40 can be secured (preferably detachably) to the lower 1lousing portion 12 by any of a wide variety of means, such as by screws, nut and bolt combinations, and the like.
For example, the illustrated mounting portions 40 include vertical intei7lally tlireaded stubs 41 that fit snugly into corresponding recesses 43 inside the recesses 42. The recesses 43 are configured to receive screws for creating a detachable comiection between the mounting portions 40 and the lower housing portion 12. The mounting portions 40 can be curved to confornn more closely to the semispherical shape of the lower housing portion 12, providing a more stable and secure connection.

[0037] The illustrated handle portions 38 are positioned generally on opposing sides of the lower housing portion 12 and are substantially parallel to one another. In the ilhistrated embodiment, the handle portions 38 coinprise elongated tubular meinbers oriented generally perpendicular to the spindle meinber 22 and positioned so as to maintain a lower extreme of the lower housing portion 12 at least slightly above the lower support surface. The handle portions 38 are preferably sized and shaped to allow a person to grip thein directly with his or her hands. Each mounting portion 40 preferably has one end coupled to an end of one of the handle portions 38 and another end coupled to an end of the other of the handle portions 38. Each end of the handle portions 38 is preferably coupled to only one of the mounting portions 40. The end portions of the illustrated mounting portions 40 extend downward and outward from a central portion that mounts to the recess 42 of the lower housing portion 12.

[0038] Iil a preferred embodiment, the lower support stnicture 18 fui-ther comprises four coupling meinbers 44, eac11 of wliich couples one of the ends of one of the ha.ndle portions 38 to one of the ends of one of the mounting portions 40. In the illustrated embodiment, the coupling members 44 contact the lower support surface, wliile the handle portions 38 and mounting portions 40 do not. The illustrated coupling members 44 comprise elbow-shaped tubular meinbers.

[0039] As mentioned above, the upper support structure 19 is preferably substantially similar to the lower support structure 18. Accordingly, the illustrated support structure 19 preferably includes handle portions 38, mounting portions 40 adapted to mount within recesses 42 of the upper housing portion 14, and coupling members 44, substantially as described above. The handle portions 38 of either support structure 18, 19 can advantageously be used to conveniently grip onto and move the reel 10.
Preferably, the support structures 18, 19 are configured to prevent the housing 11 (e.g., housing portions 12, 14, and 16) from contacting a generally flat support surface regardless of the orientation of the reel 10. For exainple, the ilh.istrated support stnictures 18, 19 prevent the housing 11 from contacting the ground even if the reel 10 is turned onto its side. In this configuration, the support stnictures more effectively protect the housing 11 from damage. In other enibodiments, the upper support structure 19 is configured differently or can even be omitted from the reel 10. It will be appreciated that a wide variety of different types of support stnictures 18, 19 can be used witliout departing from the scope of the invention.

[0040] Figures 5, 8, and 9 show a preferred embodiment of the reel drum 20.
The illustrated drum 20 comprises a substantially cylindrical meinber 46 onto which linear material can be spooled, a first end plate 48 at one end of the member 46, and a second end plate 50 at the other end of the meinber 46. The cylindrical member 46 and end plates 48 and 50 preferably rotate in unison together about the spindle member 22.
The cylindrical meinber 46 and end plates 48 and 50 can be formed integrally as a single unitary piece or can be formed separately and secured together. The middle housing portion 16 encircles the drum 20 and preferably rotates about the spindle member 22 independently of the drum 20. The aperture 15 is preferably positioned near the surface of a cylindrical member 46, so as to direct the linear material onto the druin 20 during spooling. As used herein, "spooling" refers to the process of rotating the drum 20 in a direction so as to gatller the linear material 2 thereon, and "unspooling"
refers to the process of rotating the drum 20 in a direction so as to reinove the linear material therefrom.

[0041] With reference to Figures 3, 3A, and 6-8, the lower housing portion 12 is preferably adapted to house a motor 51 that drives the reel drum 20 througll a gear reduction assembly. In the illustrated embodiment, the motor 51 is housed witllin the spindle member 22. The motor 51 is inserted into an opening 52 in the underside of the lower housing portion 12. A motor cover 54 can be provided to support the motor 51 and/or close and possibly seal the opening 52 to protect the motor and gears from dust and debris. The motor 51 drives a small output gear 53 (Figure 7) witllin the spindle ineinber 22. The output gear 53 is engaged witli a larger countershaft gear 56. As used herein, the "engagement" of two gears means that the teeth of one gear are engaged with the teeth of the other gear. The countershaft gear 56 is rotatably mounted witli respect to the lower housing portion 12, such as by a gear shaft 60 mounted in a bearing (not shown) in the housing portion 12. The illustrated spindle meinber 22 may include a slot or otlier access opening on one side that receives a radially outer portion of the countershaft gear 56, to facilitate the engagement of the gears 53 and 56. A smaller gear 57 is secured coaxially and non-rotatably to the top of the countershaft gear 56, such that the gears 56 and 57 rotate in unison. The smaller gear 57 is engaged with a ring gear 58 on the bottom side of the diLiln end plate 48. As shown more clearly in Figure 8, the ring gear 58 coinprises an aiulular wall on the bottom side of the end plate 48, with teeth facing radially inward from the amlular wall. Iiz the illustrated einbodiment, the aiuiular wall is part of a ring-shaped piece 70 that is secured to the bottom side of the end plate 48. In other einbodiments, the piece 70 can be formed integrally with the end plate 48.

[0042] Thus, the motor 51 drives the output gear 53, which in tuni drives the countershaft gear 56, which produces coaxial rotation of tlie gear 57, which in turn drives the ring gear 58 of the druin end plate 48. hi this maiuler, the motor 51 produces rotation of the ditiun 20 about the spindle meinber 22. As seen in Figure 7, in the preferred embodiment the motor 51 is upside down (i.e., its output faces downward).
However, it will be appreciated that the motor 51 can be oriented other than as shown.
Skilled artisans will also understand that a variety of different types of motors and gear reduction asseinblies can be einployed without departing from the scope of the invention.

[0043] In the preferred embodiment, the gear reduction asseinbly produces a gear reduction preferably within the range of 20:1 to 45:1, more preferably within the range of 30:1 to 40:1, more preferably witliin the range of 32:1 to 38:1, more preferably within the range of 34:1 to 36:1, and even more preferably approximately 35:1.
Iii this context, a 35:1 gear reduction means that 35 revolutions of the motor 51 results in one revolution of the druin 20. It has been found that gear reductions as high as 50:1 inalce it difficult to manually unspool the linear material from the drum 20, due to the gear reduction assembly itself and also in part to the internal resistance of the motor 51. On the other hand, gear reductions less tlian 20:1 may not provide enough power, in some applications, for spooling the linear material onto the drum 20. Suitable motors 51 are sold by Joluzson Electric (website www.johnsonelectric.coin).

[0044] In one einbodiment, the motor 51 is an electric motor. Also, a inotor-controller can be provided for controlling the motor 51. For exainple, while spooling the linear material 2 onto the drum 20, a motor-controller can be employed to vary the motor speed based upon the length of unwound linear material. It will be appreciated that if the motor speed is constant, the inwardly pulled linear material 2 tends to move faster due to the increasing diaineter of the spool itself. A motor-controller can adjust the motor speed to more safely control the motion of the linear material during spooling.
Also, a motor-controller can be used to slow or stop the motor 51 just before the linear material 2 becomes coinpletely spooled onto the drum 20. Otherwise, the linear material would get pulled into the housing 11 or, if there is an object at the end of the linear material (e.g., an electrical plug), it may whip against or otherwise iinpact the housing 11 or a person near the housing. Iii addition, a motor-controller can even be used to assist the user dtiring tmspooling (i.e., powered unspooling). One exainple of a inotor-controller for a reel is disclosed in U.S. Provisional Patent Application No. 60/585,042. Also, the motor 51 and/or inotor-controller can be operated via a reinote control. One exainple of such a reinote control systein for a inotorized reel is disclosed in U.S. Patent Application Publication No. US 2004/0231723 Al. In a prefeiTed einbodiment, a remote control is engaged on the spooled cord 2 at or near its outward end (e.g., near the plug connector 3 shown in Figure 1). The remote control can send signals wirelessly (e.g., via radio frequency signals) or through a wire within the cord 2.

[0045] In use, a user can unspool the linear material 2 from the drum 20 by pulling the inaterial out througll the aperture 15 of the middle housing portion 16. In doing so, the druin 20 begins to rotate with respect to the upper and lower housing portions 12, 14 and the spindle inember 22. The iniddle housing portion 16 is also freely rotatable, and its rotational position may vary because the aperture 15 will tend to follow the radial direction in which the user pulls the linear material 2. As the user moves around the reel 10 holding a portion of the linear inaterial that is withdrawn from the housing 11, the middle housing portion 16 freely rotates to allow the aperture 15 to follow the radial direction of the withdrawn linear inaterial. In this inaiiner, the freely rotatable middle housing portion 16 facilitates using the linear inaterial within a larger area. For example, the reel 10 can be placed centrally within a room or outdoor area (e.g., on the ground or inounted to a ceiling) and the linear inaterial can be relatively easily withdrawn toward any direction or portion of the room or area. When the user wishes to spool the linear material onto the drum 20, the user can switch on the inotor 51 accordingly. The resultant rotation of the dnun 20 causes the linear material to be pulled back into the housing 11 through the aperture 15 of the iniddle housing portion 16.

[0046] During spooling, the iniddle housing portion 16 may tend to rotate along wit11 the druin 20, due to friction tlierebetween. This can cause the linear material to swing around the reel 10, which can result in hann to surrounding persons or objects.
Preferably, the reel 10 includes a inechanical and/or electrical mechanisin to rotationally lock the iniddle housing portion 16 with respect to the upper and lower housing portions 12, 14 during spooling. With reference to Figures 3, 3A, 6, and 7, the illustrated embodiment includes a solenoid device 62 secured to the lower housing portiori 12.
Figure 6 shows the outer appearance of the solenoid device 62, and Figures 3, 3A, and 7 show it partially in cross-section. The solenoid device 62 is electrically operable, as well known in the art, to cause a piston stein 64 to extend in and out of an outer opening of its housing. The stem 64 is sized and shaped to slide into any one of a ring of indentations 66 provided on the inner surface of the middle housing portion 16. The indentations 66 can have any of wide variety of shapes and sizes, keeping in inind the goal of permitting the solenoid stein 64 to stop the middle housing portion 16 from rotating by entering one of the indentations 66. Wlien the stein 64 enters one of the indentations 66, it "locks" the middle housing portion 16. In other words, the extended stein 64 prevents the iniddle housing portion 16 from rotating with respect to the upper and lower housing portions 12, 14. An electronic control system can be provided to actuate the solenoid device 62 (i.e., cause the stem 64 to extend) when the motor 51 is switched to a spooling operation, and to retract the solenoid device 62 (i.e., cause the stem 64 to retract into its housing) when the motor 51 is switched off or to a powered unspooling operation.

[0047] hi a preferred einbodiment, the reel 10 is adapted to spool and provide power to an electrical cord 2 that delivers power to an external device. The reel 10 preferably includes a power connector for receiving an end of the spooled electrical cord 2, wherein the power comlector is connected to a source of electrical power.
With reference to Figure 9, the end plate 50 of the druin 20 preferably includes a housing 74 for a power comlector 72 and an electrical plug 73 formed at an end of an electrical cord 2 (Figure 1) spooled on the drum 20. The power connector 72 is adapted to receive the cord plug 73, preferably with a snap-fit engagement. The power comiector 72 is comiected to a source of electrical power, as described in further detail below, and delivers such power to the plug 73 of the spooled cord 2. For example, the power coiulector 72 can receive power via three wires 80, 81, and 82, corresponding to a "hot" or powered AC
ctirrent lv.le, a neutral line, and a ground liuie, as lalown in the art. The electrical cord 2 extends from the plug 73 on a radially outward side of one or more strain-relief restraints 75, througll an opening 76 in the end plate 50, and onto the cylindrical meinber 46 of the drum 20. By limiting tension in the cord 2, the strain-relief restraints 75 help to prevent the plug 73 from discoiulecting from the power connector 72 when the cord 2 becomes completely tmspooled. It will be understood that the power coiuiector 72 can be adapted to receive either a standard or a non-standard electrical plug 73. In one embodiment, the power coiulector 72 is rated at 20 ainps. Suitable power coiulectors 72 are sold by Molex (website www.molex.com).

[0048] With reference to Figure 8, the bottom surface of the end plate 48 preferably includes tlzree concentric, electrically conductive rings 78 (sometimes referred to as "slip rings") encircling the central opening 28. The slip rings 78 are preferably fonned of an electrically conductive material, such as brass. Each of the slip rings 78 is preferably electrically connected tllrough the walls and materials of the dntm 20 to one of the three wires 80, 81, and 82 (Figure 9) cormected to the power coimector 72.
For example, electrical conduits can be fonned witliin the end plates 48 and 50 and an aiulular wall that substantially defines the cylindrical ineinber 46. Each of the slip rings 78 is configured to conduct one component of an electrical power signal (i.e., hot, neutral, and ground) to the power connector 72.

[0049] With reference to Figures 3 and 6, a support plate 84 is secured within the lower housing portion 12 and includes electrically conductive sliding contact elements 86, 87, and 88, each of which is configured to substantially continuously contact one of the slip rings 78 (Figure 8) during rotation of the druin 20 about the spindle meinber 22.
The sliding contact elements 86, 87, and 88 may coinprise, for example, bru.shes or strips of sheet metal biased against the slip rings 78 by internal elastic bending stresses (as in leaf springs) or external biasing means (e.g, external springs). In any case, each sliding contact element 86, 87, 88 preferably maintains electrical contact with one of the slip rings 78, and each slip ring 78 is in electrical contact with only one of the sliding contact elements. The sliding contact elements are preferably electrically coruiected to an external source of electrical power. For example, each sliding contact element 86, 87, 88 can transmit one component of an electrical power transmission (e.g., hot, neutral, and ground lines). In a preferred embodiment, the sliding contact elements 86, 87, 88 are wired to the standard electrical cable 13 (Figure 1) that extends out of a lower opening (not shown) of the lower housing portion 12. Thus, in this embodiment, electrical power is delivered from an external source (e.g., a standard power outlet) through the cable 13, sliding contact elements 86, 87, 88, slip rings 78, wires 80, 81, 82, and power coruiector 72 to an electrical cord 2 wound on the drun120.

[0050] It will be appreciated that a wide variety of different sizes and shapes are possible for the aperture 15 of the middle housing portion 16. The aperture 15 can be sized and shaped to relatively closely surround the spooled linear material 2 (e.g., a standard size electrical cord). Altei7iatively, Figure 10 shows a housing 11 whose aperture 15 is rectangular a.nd oriented substantially perpendicular to the spindle member 22 (Figure 2). Figures 11 and 12 show anotlier altemative, in which the aperture 15 is rectangular and oriented substantially parallel to the spindle ineinber 22.
Other sizes and shapes for the aperture 15 are possible. hi addition, friction-reducing elements (such as rollers) may be provided at the edges of the aperture 15 for reducing friction between the spooled cord 2 and the aperture edges.

[0051] Figures 11 and 12 show a reel 10 along with a mounting eleinent 90 for securing the reel to a wall or ceiling. The mounting eleinent 90 is configured to be secured to a wall or a ceiling, and is also configured to support the reel 10 by loclcing onto two of the handle portions 38 of the support stnictures 18, 19. The illustrated mounting eleinent 90 comprises a generally planar element or plate 92 that is configured to be mounted to a wall or ceiling. For example, the planar element 92 can be mounted via nails, screws, nut and bolt combinations, and the like. The illustrated mounting eleinent 90 also includes a latch member 94 and a hook ineinber 96 at opposite ends of the planar element 92. The latch member 94 preferably defines a recess 95 that is sized and shaped to receive one of the handle poi-tions 38. The hook ineinber 96 is also preferably sized and shaped to receive one of the handle portions 38. The mounting element 90 is preferably configured so that when one of the handle portions 38 is received within the hook meinber 96, the reel 10 can be rotated about the hook member 96 so that one of the otller ha.nndle portions 38 partially deflects the latch member 94 and then snaps into the recess 95 thereof, effectively locking the reel 10 onto the mounting element 90.

[0052] Figures 11 and 12 show the reel 10 reinovably secured to the inounting eleinent 90. In Figure 11, the mounting element 90 is shown locked onto one of the handle portions 38 of the lower support structure 18 and one of the handle portions 38 of the upper support structure 19. Iii Figure 12, the mounting element 90 is shown locked onto both of the handle portions 38 of the upper support structure 19. It will be understood that the mounting element 90 can be configured to lock onto both of the handle portions 38 of the lower support structure 18. In the preferred embodiment, the reel 10 is configured so that the distance between each of the handle portions 38 of each support structure 18, 19 is substantially equal, so that the mounting element 90 can be reinovably secured to either support stiticture, as desired. Further, the distance between a handle portion 38 of the support structure 18 and a handle portion 38 of the support stnicture 19 on one side of the reel 10 is preferably substantially equal to such distance on the other side of the reel 10, so that the mounting element 90 can be removably secured (as in Figure 11) on either side of the ree110, as desired.

[0053] Figure 13 is a power flow diagrain illustrating the use of one or more temperature sensors for preventing overheating and melting of the spooled linear material 2. The illustrated apparatus includes an electrical power source 100 that provides power to the spooled cord 2. The power source 100 can be a cormnon AC power source suitable for delivering power to the cord 13 (Figure 1). One or more teinperature-sensitive switches 102A, 102B, etc. are provided between the power source 100 and the power comiector 72 (also shown in Figure 9) to which the spooled cord 2 is connected. The switches 102 include temperature sensing elements, or temperature sensors.
Each switch 102 is configured to open when its local teinperature exceeds a given tlireshold. The activation temperature thresholds of the switches 102 are preferably such that if the power load on the cord 2 becomes too high, so as to heat the cord 2 and introduce the risk of melting the insulation thereof, the switches 102 move to their open positions to stop the current flow to the cord 2. In a preferred embodiment, the switches 102 are powered by electrical connection to the "hot" slip ring 78. It will be appreciated that a variety of different types of switches can be used, such as units comprising separate temperature sensors and switches that operate based on the sensor readings/signals. hi a preferred einbodiment, the switch 102 is a "bimetal therinostat switch" (also referred to as a "tlierinostat" or "tlzermal protector"), as lu-iown in the art. Suitable switches 102 are sold by Thermtrol Corporation of Canton, Ohio, U.S.A. It will be appreciated that the teinperature activation threshold may depend upon the thermal qualities (e.g., melting point) of the spooled linear material 2, and possibly whether the reel is used indoors or outdoors. The teinperature-sensitive switches 102 can be located anywhere on or within the reel, but are preferably located near the surface of the cylindrical ineinber 46 on w11ic11 the cord 2 is spooled.

[0054] In the illustrated embodiment, two temperature-sensitive switches 102A and 102B are connected in parallel. It has been discovered that the operation of a bimetal thermostat switch is sometimes affected by the cuiTent flow therethrough. hi particular, high cuiTent flow tlirough the switch can lower the teinperature at which the switch opens. For example, if the current flow tluough the switch 102A is too high, the switch may begin to open at a reduced temperature, which in turn can lead to undesired power cut-offs to the cord 2. In order to overcome this problem, there are preferably two or more switches 102 connected in parallel, as shown. This greatly reduces the current flow through each switch 102 and reduces the risk of premature opening. In oth.er words, a high local temperature that causes a switch 102 to open is not likely to be caused by the internal resistance and heat generation of the switch itself. In the embodiment of Figure 13, if one switch 102A becomes too hot and then opens, all of the current then flows througll the other switcll 102B. The high cuiTent load will then cause the switch 102B to open due to increased current load. In this way, the multiple switches 102 in parallel provide redundancy in the temperature sensing. If one switch opens premattirely (i.e., for reasons otller than an undesirably higll local temperature not caused by the internal resistance and heat generation of the switch itself), then the other switch will still provide the temperature sensing and power cut-off functions. Any nuinber of switches 102 can be coiulected in parallel to provide increased redundancy and f-urther reduce the current flows tlzrough each switch.

[0055] hi addition, the reel can include a grotuld fault interrupter (GFI) for safety purposes. The GFI can be located in the reel or even in the cord 2.
GFI's are well known in the art. A GFI typically acts to disable a circuit when incoming current (e.g., through a "hot" line) is not equal to outgoing current (e.g., through a "neutral" line).

[0056] In some embodiments, the housing portions 12, 14, and 16 and spindle member 22 are formed of ABS (acrylonitrile butadiene styrene) plastic.
However, other materials can be used, giving due consideration to the goal of providing a long-lasting, durable, yet affordable housing 11. The spindle ineinber 22 is preferably fonned integrally witli the lower housing portion 12. The cylindrical meinber 46 and possibly the end plates 48 and 50 can be fornned of polyolefin, but many other materials are possible.
The gears may be formed of acetyl, such as DelrinOO sold by Dupont, headquartered in Wilmington, DE.

[0057] It will be appreciated that the reel druin 20 may include guide grooves for the linear material, a retraction limiting band for preventing discomlection of the linear material 2 at complete unspooling, and/or a rainp on the drum surface to facilitate smootll transition between spool layers. As an exaniple, these features are disclosed in U.S.
Patent Application Publication No. 2004/0206849 Al.

[0058] While the preferred embodiments have been described above in the context of an electrical cord reel, skilled artisans will appreciate that many of the above-described aspects of the present invention are applicable for reels for other types of linear materials.

[0059] Although the invention has been disclosed in the context of certain embodiments and examples, it will be understood by those skilled in the art that the invention extends beyond the specifically disclosed einbodiments to other alternative einbodiments and/or uses and obvious modifications and equivalents thereof.
Accordingly, the invention is not intended to be limited by the specific disclosures of preferred einbodiinents herein.

Claims (8)

1. ~A reel comprising:
a drum onto which a linear material can be spooled;
a first housing portion;
a second housing portion;
a spindle member having a first end connected to the first housing portion and a second end connected to the second housing portion, the spindle member extending through an opening in the drum so that the drum is rotatable about a spindle axis defined by the spindle member;
a middle housing portion encircling the drum and positioned between the first and second housing portions, the middle housing portion having an aperture through which linear material car extend, the middle housing portion being rotatable about the spindle axis independently of the drum; and a mechanism configured to restrict rotation of the middle housing portion with respect to the first and second housing portions when the drum rotates in a direction to spool the linear material onto the drum;
wherein the first, second, and middle housing portions collectively form a housing for the drum.

2. ~The reel of Claim 1, where in the first housing portion, second housing portion, and spindle member are fixed with respect to one another.

3. ~The reel of Claim 1, wherein the middle housing portion is freely rotatable through at least 360° about the spindle axis.

4. ~The reel of Claim 1, wherein the spindle member is formed integrally with the first housing portion.

5. ~The reel of Claim 1, further comprising a motor configured to rotate the drum with respect to the spindle member.

6. ~The reel of Claim 5, wherein the motor is configured to rotate the drum through a gear reduction assembly.

7. ~The reel of Claim 5, wherein motor is configured to produce rotation of a ring gear on the drum.

8. ~The reel of Claim 5, further comprising a remote control configured to control the motor.