Closure Assembly for Structural Members

1. Field of the Invention

The present invention relates to closure means for structural members such as doors, windows, truck beds and the like and, more specifically, it relates to such an assembly which is easy to install and may sustain impact loads with minimum structural damage.

2. Description of the Prior Art

It has been known for numerous structural usages to provide various forms of movable closures such as doors and windows, for example, including those which may be subjected to frequent use and abuse as in an industrial or commercial environment.

It has also been known to provide such doors with closure members made of flexible materials which may be received on and released from a motorized reel so as to open and close the doors. One of the problems with industrial doors of this type is that they are frequently subjected to undesired high impact loads which do structural damage to the door, the door frames, or both.

U.S. Pat. No. 550,412 discloses a means for clamping and unclamping screen material between framing members by employing pins which slide in angularly disposed slots moving in a plane generally perpendicular to the plane of the screen material. U.S. Pat. No. 1,961,383 discloses window screens having pins moving in angularly disposed slots which serve as stop members.

A clamping mechanism for a window screen is disclosed in U.S. Pat. No. 1,892,001.

U.S. Pat. No. 2,886,103 discloses a retractable system for windows wherein a cam slot serves to provide clamping once the closure is in place.

U.S. Pat. No. 2,594,910 discloses a roll-up type cover for trucks and trailers. U.S. Pat. No. 2,584,014 discloses a removable truck top.

U.S. Pat. No. 4,649,981 discloses a shade with a flap cut out of the shade material and reintroduced thereto when the shade is rolled up, apparently, to eliminate excess size build-up in the rolled material.

A window screen having projecting tabs which are adapted to move in a slot is disclosed in U.S. Pat. No. 618,831. U.S. Pat. No. 1,425,484 also discloses a screen member having portions which ride in a track.

U.S. Pat. No. 1,673,326 discloses a spring biased tensioning mount for applying tension to a screen.

U.S. Pat. No. 1,387,452 discloses a window screen having a roller cam which may be rotated by means of an operating handle in order to cam the screen fabric against the track wall.

In spite of these previously known systems, there remains a need for an improved closure system for structural members which will resist undesired damage, provide effective sealing, and function in an efficient manner under a wide variety of operating conditions.

The closure assembly of the present invention has met the above-described need.

In one embodiment a closure member has tracking means secured thereto with the tracking means being mechanically secured within guide means for relative sliding movement therebetween.

Biasing means are preferably employed in order to provide lateral tension on the closure member. The biasing means may include a coil spring which urges shoe means angularly outwardly. The shoe means are disposed within a plurality of generally upwardly and angularly disposed channel guides.

It is an object of the present invention to provide an improved closure assembly which is adapted for use in a wide variety of structural applications and is adapted to function efficiently while resisting deleterious effects of impact loads.

It is a another object of the present invention to provide a closure member slidingly interengaged with guide means and such guide means being movable secured to associated frame means.

It is a further object of the present invention to provide a durable construction of this type which may be used on garage doors, industrial doors, other types of doors, windows, truck bed closures, swimming pool covers, and awnings.

It is a further object of this invention to provide a closure assembly which seals separated regions to resist environmental contamination.

It is a further object of the present invention to provide such a closure which establishes an effective seal between areas on opposite sides of the closure assembly.

It is another object of the present invention to provide such a closure assembly which reduces friction and thereby facilitates ease of use and minimizes material wear.

It is another object of this invention to provide such a closure assembly which permits expansion and contraction of the closure, as well as adjusting for out of plumb installation of the guide system and maintains the desired tension in the closure material.

It is yet another object of the present invention to provide such a door wherein positive means are employed to facilitate transverse tensioning of the closure member.

It is another object of the present invention to provide such a closure assembly which is adapted for use with power operated closure members.

These and other objects of the invention will be more fully understood from the following description of the invention on reference to the illustrations appended hereto.

FIG. 1 is a front elevational view of a garage or industrial door of the present invention.

FIG. 2 is a cross-sectional illustration of a portion of the closure member securing means taken through 2--2 of FIG. 1.

FIG. 3A shows a cross-sectional illustration of a modified form of securement between the closure member and its associated securement means.

FIG. 3B is similar to FIG. 3A, but shows a system wherein two tape means are employed.

FIG. 4 is a cross-sectional illustration showing a further modified form of closure member securement of the invention.

FIG. 5 is a cross-sectional illustration showing a portion of the base of the closure member taken through 5--5 of FIG. 1.

FIG. 6 is a cross-sectional view of a modified form of interengagement between the closure member and the guide means.

FIGS. 7 and 8 are, respectively, a fragmentary perspective view showing a portion of the upper guide member of the present invention and cross-sectional view of the same taken through 8--8 of FIG. 7.

FIG. 9 is a cross-sectional illustration of one form of biasing means employable in the present invention.

FIG. 10 is a cross-sectional illustration of another form of biasing means employable in the present invention.

FIG. 11 is a cross-sectional view of another form of biasing means employable in the present invention.

FIG. 12 is a front elevational view of a guide channel and its associated shoe.

FIG. 13 is a cross-sectional illustration of the guide channel and shoe of FIG. 12 taken through 13--13.

FIG. 14 is a partial cross-sectional illustration of the guide channel and shoe engaged with guide means.

FIG. 15 is a front elevational view of the shoe.

FIG. 16 is a right side elevational view of the shoe.

FIG. 17 is a schematic top plan view of the pickup truck bed employing another embodiment of the invention.

FIG. 18 is cross-sectional illustration taken through 18--18 of FIG. 17 showing a form of guide means of the present invention.

FIG. 19 is a schematic illustration of a form of stabilizer assembly employed in the truck embodiment of the invention.

FIG. 20 is a cross-sectional illustration of a portion of the stabilizer assembly taken through 20--20 of FIG. 19.

As used herein the term "closure member" shall be deemed to include closures in the form of various types of members which are adapted to close and open structural openings such as doors, windows, pickup truck beds, swimming pools and the like.

Referring once again to FIG. 1, there is shown a closure member 2, which in the form illustrated, is a door made out of a flexible material such as vinyl coated polyester core fabric or polyvinyl chloride, for example, which is adapted to be stored on reel 4 when the door is in the open position. The reel 4 is fixedly secured to shafts 6, 8 which are journaled in suitable bearings (not shown). The reel 4 is adapted to be driven in one of two directions depending upon whether the door is being opened or closed by reversible motor 12 through gear box 14. In the alternative, the reel 4 may be driven by hand chain, push-pull means or a crank, for example. A spring may be inserted inside or outside of the barrel to assist in operation of the closure for these alternative methods. In the form illustrated, the door is in the down or closed positions. The door has a pair of generally vertically oriented frame members 16, 18 which are generally parallel to each other and disposed adjacent to the lateral edges of the closure member 2.

Referring to FIGS. 1 and 2, it will be noted that the frame 16 has a rear portion 19 and a pair of forwardly projecting flanges 20, 22 which are oriented generally perpendicularly with respect thereto and create a channel which defines a recess 26. Lower flange 64 is at the lower end of frame 16. While not illustrated in FIG. 1, the frame 16 may cooperate with a frame cover plate 30 which has one portion 32 secured to frame flange 22 and a cover portion 34 which shields a portion of the closure member anchorage assembly. This cover plate 30 which is optional serves to resist undesired entry of dirt into the frame interior and also is aesthetically more desirable.

As shown in FIG. 2 and 3A, the closure member 2 has tracking means 40 secured thereto by fastening means 41 positioned generally in the middle thereof. In this form the tracking means has a centrally located depressed panel 43 which minimizes contact between stitching 41 and guide means 42 to thereby shield the stitching 41 and reduce friction. Fastening means may be any desired form of fastening means including sewing or mechanical fasteners such as rivets, double faced pressure sensitive tape or staples, for example, which will provide the securement desired while permitting the door to be stored on reel 4. The closure assembly 2 is provided with guide means 42 which is, preferably, substantially rigid and may conveniently be an aluminum extrusion.

With reference to FIG. 3B, it is noted that the closure member 2 has tracking means which consist of a first tape 51 and a second tape 54 both of which are secured on the same side of the closure member 2. The free portions of the two tapes 51, 54 are received between the two re-entrant flanges 48, 50. This serves to minimize wear of the lateral edges of the closure member 2 and also reduces the frictional forces resisting relative movement between the guide means 42 and the closure member 2.

Referring to FIGS. 2, 3A and 3B, it will be appreciated that the guide means 42 has a front wall 46 which has a pair of re-entrant flanges 48, 50 within which portions of the tracking means 40 are retained by mechanical engagement. It will be appreciated that relative sliding movement of the tracking means 40 with respect to the guide means 42 is permitted, but relative separation of the tracking means 40 from the guide means 42 is resisted. Thus, in moving the closure member between an open position and a closed position, relative sliding movement will be effected.

While the tracking means 40 may be made of any desirable material or be of any desired shape so long as the desired mechanical interengagement may be effected without risk of loss of such engagement and while permitting relative sliding movement, it is preferred that the tracking means be in the form of a tape and, preferably, a substantially rigid plastic tape such as one made of ultrahigh molecular weight polyethylene or vinyl. In this manner, the frictional resistance to relative sliding movement between the guide means 42 and the closure member 2 is reduced, thereby requiring less force to effect opening and closing of the door. Also, the use of such materials is economical and the tape configuration facilitates rolling the closure member 2 on the reel 4 without excessive build-up of material in the tape area.

Referring still to FIG. 2, it will be appreciated that the frame cover portion 34 is spaced from the closure member 2 so as to establish a gap 52. Similarly, the rear wall 60 of the guide means 42 is spaced from rear portion 19 of framing member 16 so as to provide a gap 62. While the framing member cover plate 30 provides a certain degree of shielding, nevertheless, there is created the potential for the undesired passage of air from one side of the door to the other. Such air, for example, may be of a different temperature, or may contain potentially hazardous constituents and be environmentally undesirable. It is preferred, therefore, with reference to FIGS. 2, 3A and 3B to provide a pair of rearwardly facing gasket receiving openings 66, 68 on the portion of the guide means 42 which faces the rear portion 19 of the framing member 16. A single such gasket 70 is shown received mechanically by snap fitting into recess 66 and in resiliently maintained contact with the inner surface of base wall 19 of framing member 16. Similarly, a second gasket may be provided in recess 68. This gasket member may be made of any suitable resilient material such as neoprene, rubber or plastic, for example. It serves to maintain a seal between one side of the door and the other so as to resist undesired passage of air therethrough. It will be appreciated that the sealing member 70 is, preferably, longitudinally continuous and coextensive with the guide means 42 so as to provide for continuous sealing. Guide means which may be identical to guide means 42 are movably secured to frame 18 for relative movement with respect thereto.

Referring to FIG. 4, a further embodiment of the invention will be considered. In this embodiment, the closure member 2 is secured to the tape 40 by fastener means 42. The guide means 76 has been modified. While retaining gasket receiving recesses 66, 68, one portion of the extrusion has been modified so as to provide a generally cylindrical rib 80 to which is secured a generally hook-shaped member 82 which is in general surface-to-surface surrounding relationship with respect to rib 80. The hook-shaped member 82 has a flange 84 which cooperates with wall 86 of the guide means 76 to define a portion of a tape receiving recess 90. In this embodiment were an impact load to be applied to the closure member 2, the hook shaped member 82 would fracture or release so as to once again avoid damage to the main structural members, or the building, or to the closure. It will be appreciated that the hook-shaped member 82 will be of generally uniform cross-sectional configuration through its length and be substantially coextensive with the guide means 76.

Referring once again to FIGS. 1 and 2, it will be appreciated that were a vehicle, such as a forklift drive, for example, to accidentally hit the closure member 2, no structural damage will be done to portions of the building, and it is highly unlikely that any structural damage will be done to the guide means 42 or the framing means 16. What is most likely to occur, is either the tape 40 will disengage from the closure 2 as a result of fracture of the fastening means 42, or the tape 40 will be pulled out of recess 74 defined in the guide means 42.

More specifically, the closure member will tend to deflect away from the direction from which the impact force is imposed thereby causing tape 40 to apply a substantial force on hook-shaped member 82. This force will cause member 82 to disengage from rib 80. This disengagement of member 82 forces tape 40, which is secured to closure member 2, away from the guide means 76. In order to put the door back in operation, the closure member is placed in the open position and member 82 is snapped back into engagement with rib 89. Tape 40 is inserted into guide means 76 and the door is ready for operation.

Referring to FIGS. 1 and 5, there is shown a cross-section of the base portion of the closure assembly. The closure member 2 terminates in a loop portion 92 which is adapted to be in contact with the underlying floor to facilitate providing a seal therewith. A transverse stiffener member 100, which in the form shown, consists of two generally identical channel-shaped portions 102, 104 cooperate to define a recess 112 through which the closure member 2 passes. Confined within the recess 112 of the stiffener 100 are a pair of guide means 114, 116 which receive respectively tracking means 120, 122. The assembly is secured by means of bolts 106, 108 which screw into guide means 114, 116. It will be appreciated that the assembly is retained by the tracking means 120, 122 being received within the respective guide means 114, 116 which, in turn, are respectively secured to the channel shaped portions 102, 104 to thereby establish unitary action in the stiffener member 100. This transverse bar 100 not only facilitates engagement of the lower portion of the door, but stiffens the same. In addition, the influence of gravity on the weight of this stiffener facilitates efficient operation of the door. When the bolts 106, 108 have been tightened, the clamping engagement with the closure member 2 will serve to secure the stiffener bar 100 to the lower portion of the closure member. This connection allows the closure member 2 to expand and contract. It also distributed the weight of the stiffener member 100 evenly across the closure.

Referring to FIG. 6, there is shown a modified form of the invention wherein the guide means 130 has a pair of re-entrant flanges 132, 134 which cooperate with the remainder of the guide means 130 to define recess 140. The closure member 142 has a pair of tracking means 146, 148 secured thereto by suitable fastener means 150 which may take the form of sewing, double faced tape, rivets, or bolting, for example. In this embodiment of the invention, it will be appreciated that tracking means 146 is received within the hollow portion of re-entrant flange 132 and tracking means 148 is received within the hollow portion of re-entrant flange 134 so as to provide a different form of mechanical interengagement between the closure member 142 and the guide means 130 from the embodiment of FIGS. 1 through 4 while facilitating relative sliding movement therebetween. In this embodiment, the tracking means 146, 148 are on opposite sides of the closure member 142.

In this embodiment, a suitable shoe construction such as that shown in FIGS. 15 and 16 is secured to the upper surface of guide means 130 and engages channel guides as is shown in FIGS. 12 and 13. One suitable means for securing the shoe to guide means 130 is to provide an integrally formed depending leg which may be secured to the wall of guide means 130 opposite the opening through which closure member 142 extends. The depending leg may have a width less than the shoe width as shown proportionally in FIG. 16. Securement may be effected by any suitable means such as mechanical fasteners, or if the shoe is composed of metal, welding, for example.

FIGS. 7 and 8 show an upper portion of the guide means 42 which serve to facilitate efficient movement of the closure member onto and off of the reel 4. A freely rotatable roller member 160 is mounted for axial rotation about bolt 162 which is anchored to structural member 164 by nut 168 which is threadedly secured to bolt 164. The cap member 170 is adapted to be mechanically received within central recess 190 (FIGS. 2 and 8) of the guide means 42. The cap member 170 serves as a keeper means to prevent the tracking means from coming completely out of the guide means 42. It will be appreciated that the lower portion 192 of cap member 170 is in intimate contact within recess 190 so as to provide effective mechanical securement thereof. The cap member 170 also has a pair of upstanding sidewalls 194, 196 adjacent lateral edges thereof. As the closure member 2 unwraps from the reel or barrel 4, the closure member 2 is forced against recess surface 174 of cap member 170 by roller 160. This action urges the tracking means (not shown in this view) to enter the guide means and in the double tape embodiment to have a portion outside the guide means as desired.

Referring once again to FIG. 1, it will be appreciated that the frame members 16, 18 have, respectively, a plurality of upwardly and outwardly extending guide channels 200, 202, 204, 206, 210, 212, 214, 216. In the form illustrated, these channels, preferably, are at an angle of about 221/2 to 55 degrees and most preferably, 45 degrees with the vertical. It is preferred that these channels be spaced vertically about 1 to 31/2 feet from each other. These guide channels preferably have a length of about 11/2 to 12 inches. These facilitate maintaining the desired transverse tension on the closure member in a manner which will be described hereinafter. These channels are fixedly secured to the frame members 16, 18 and serve as the means for mechanically connecting the guide means in a relatively movable relationship with the frame members 16, 18.

Referring to FIG. 9 there is shown the right side frame member 16 which has a guide means 42. A single guide channel 200 is shown which is secured to frame base wall 19 by mechanical fasteners 230, 232, 234 which may be nuts and bolts, for example, or any other suitable means. It is preferred that the guide channels 200 be made of plastic and have re-entrant flanges for receipt of the shoe (not shown) which is secured to the guide means 42. A compression coil spring 231 is shown disposed in the end of the guide means 42 within the central recess 190 (FIG. 8) of the guide means 42 in a compressed position. Securing the upper end of the spring 231 against undesired upward movement is a transversely oriented retainer pin 239 which is secured within openings of guide means 42. At the lower end is a piston 240 which terminates in a roller base 242. When the guide means 42 is installed, the roller engages the lower flange 250 of frame 16 and urges the piston 240 upwardly, thereby compressing the spring 231. This compression serves to provide a longitudinal upward force which imposes a vectoral outward and upward force on the shoes disposed within the guide channels such as 200, thereby moving the guide channel 42 to the right in FIG. 9 and enhancing the lateral tension on the closure member 2. A similar assembly for outwardly biasing the other guide means associated with frame member 18 is also provided.

It will be appreciated that alternate means for biasing the closure member may also be employed. In the embodiment shown in FIG. 10, the assembly is essentially as in the embodiment of FIG. 9, except in lieu of using a shoe within the various guide channels, such as guide channel 202, a linkage arm 260 is pivotally secured to the frame rear portion 19 through pivot 262 and is also pivotally secured to the guide means 42 by pivot 264. This arrangement permits rotation of the link 260 in a clockwise direction from the position shown to thereby apply force to the guide means 42 moving it to the right and increasing the lateral tension on the closure member. The reverse direction of movement of the link would occur for the other frame.

In the embodiment of FIG. 11, a disk 270 is secured to guide means 42 by means of pivot pin 274. Disk 270 is also secured to frame base wall 19 by pivot pin 290. Pin 274 may be considered as projecting out of the page and pin 290 projecting down into the page. When upward force is applied to guide means 42, disk 270 rotates guide means 42 upwardly and outwardly to increase the tension in closure member 2.

Referring now in greater detail to FIGS. 12 through 14 there is shown a guide channel 300 which has a base portion 302 and a pair of upstanding flanges 304, 306 which terminate in re-entrant portions defining a pair of recesses. A shoe member 310 has a base portion 312 with a pair of lateral projections 314, 316 which are received within re-entrant flanges 304, 306, respectively. In this manner relative sliding movement between the guide channel 300 and the shoe member 310 is permitted while resisting separation of the two.

The shoe 310 has a pair of upstanding ribs 320, 322, may be received within the rearwardly open recesses 66 and 68 (FIG. 3A) of the guide means 42 and are secured in place by any suitable means. This interengagement permits relative sliding movement therebetween. It will be appreciated that in installing the gasket means 70 (FIG. 2) gaps will appear where the shoes 310 are inserted in the guide channels 300.

The ribs 320, 322 are shown in greater detail in FIGS. 15 and 16. It will be noted in FIG. 15 that the ribs 320, 322 are generally L-shaped in order to facilitate mechanical interengagement with recesses 66, 68 of guide means 42 to provide resistance to inadvertent separation therebetween.

Referring now to FIG. 17, there is shown schematically in plan, a pickup truck which has a passenger cab portion 350, a windshield 352, a hood 354 and a truck bed 360. The truck bed has a floor 362 which forms the base of the upwardly opened bed recess defined by floor 362, truck rear gate 364, a pair of generally parallel longitudinal sidewalls (not shown) and the rear portion of the cab 350 (not shown).

The similarity between the closure assembly employed in connection with this truck bed embodiment and those discussed previously hereinbefore will be apparent. The closure member 370 may consist of a waterproof member and may have a rearward portion secured to a substantially rigid transverse frame member 372 which may be engaged manually in order to reciprocate the cover and the direction indicated by arrow A so as to close the truck bed by moving the frame member 372 to rear gate 364 or moving the same in the direction indicated by arrow B to open the truck bed and permit access thereto. At the forward end of the closure member 370 is a hood 376 which preferably is spring biased so as to facilitate placing the closure 370 in the open or retracted position. If desired, weatherstripping may be placed on the underside of the hood 376 so as to resist entry of foreign material which might be on the upper surface of the closure member 370 as the reel takes up the closure member 370.

With reference to FIGS. 17 and 18, it will be appreciated that a pair of elongated generally parallel guide means 380, 382 as shown in FIG. 18 which may be generally similar to those shown in FIGS. 3A and 3B. The closure member 370 has tracking means which in the form illustrated are a pair of superimposed tapes 386, 388 which receive re-entrant flanges 390, 392 of the guide means therebetween. As was true in connection with the prior embodiments, this form of interengagement which will be provided on both sides of the truck bed serves to facilitate relative longitudinal sliding movement of the closure 370 between an open and closed position.

As shown in FIG. 18, a cover plate 411 has a body portion 412 and a pair of depending flanges 413, 414 and has an inverted channel shape. Cover plate 411 is in overlying spaced relationship with respect to guide means 382. Flange 414 terminates in a re-entrant flange 417 which defines an upwardly open recess which recess receives downwardly projecting flange 415 of connector 416. Connector 416 has a lower portion 418 which is secured to truck bed sidewall 419 which terminates an outwardly directed flange by any desired means, such as bolt 409, for example. A series of spaced screws 410 serve to establish the desired initial set up positions of flanges 415, 417. This cover plate 411 serves to resist entry of foreign matter into the guide means 382.

In the preferred embodiment tensioning of the closure material 370 and retention of guide means 382 (and the corresponding guide means on the other side which is not shown) will be effected by tensioning means such as is shown in FIGS. 1 and 9 through 11 cooperating with guide channels such as 200 through 216 (even numbers only) which will be oriented angularly outwardly and forwardly (i.e., in the direction in which the truck is facing and laterally outwardly). One guide channel is shown as element 421 in FIG. 18.

In this manner, the guide means are shielded from exposure to dirt, rain, snow and other materials which might potentially interfere with efficient functioning of the truck bed closure means.

It will be appreciated that as the closure member 370 moves in a horizontal plane, unlike the embodiment of FIG. 1, there is no opportunity through the use of a stiffener bar 100, 372 to take advantage of the influence of gravity in providing for relative aligned movement of the respective sides of the closure member. A preferred approach to maintaining side to side stability in the closure member 370 is illustrated in FIG. 19.

A pair of cable members 420, 422 have a first end 424, 426 respectively, secured generally underlying frame members 380, 382 and fixedly secured toward the front portion of the truck bed. Cable 420 crosses over angularly transversely and has a second end 430 fixedly secured toward the rear of the truck bed. It may be secured to the truck bed sidewalls. Similarly, cable 422 crosses over transversely and has a second end 432 adjacent to the rear portion of the truck. Stabilizer member 440 is elongated and disposed generally transversely with respect to the truck bed. It may be secured to the truck bed sidewalls. It has four upstanding post members 444, 446, 448 and 450. The first cable 420, passes rearwardly of post 444 and against the forward side of post 450. Cable 422 passes rearwardly of post 448 and is in contact with the forward portion of 446.

It will be appreciated that with the cables in fixed position, movement of the stabilizer 440 and the directions shown by arrows C or D will result in the longitudinal axis of the stabilizer member 440 being oriented substantially perpendicularly to the longitudinal axis of the truck bed, thereby facilitating uniform movement of the closure member rearwardly and forwardly.

It will be appreciated that as truck sidewalls are not generally made with great precision, the screws 410 may be employed to adjust the relative positioning of the framing members 380 and 382 transversely so as to provide the desired initial transverse tension in the closure member 370.

It will be appreciated that closure 170 may be opened or closed manually directly or with a mechanical assist such as a crank or a motor.

It will be appreciated, therefore, that the present invention has provided an efficient and economical means for effectively establishing sealed closure of a structural opening while resisting undesired damage were an accident to occur such as vehicular impact with the door in closed position.

It will be appreciated that while in the form illustrated, the closure member is a door composed of flexible material which is adapted to be stored on a reel when the doorway is opened, the invention is not so limited. Rigid doors of generally planar configuration which move directly vertically or directly horizontally into storage areas may also employ the invention in essentially the same manner, i.e., by having tracking means connecting the door's lateral edges with guide means which are relatively movable with respect to frame means.

While for purposes of illustration, reference has been made to a reel-type overhead industrial or garage door and pickup truck bodies, it will be appreciated that the invention is not so limited, but rather is usable with a wide variety of types of closure members. For example, it may be used with other types of doors with windows, with swimming pool covers, and awnings.

While certain specific embodiments of the invention have been disclosed for purposes of illustration, it will be evident to those skilled in the art that numerous variations of the details may be made without departing from the invention as defined in the appended claims.