Abstract: Brackets mounted to the corners of a garage door improve the strength of a garage structure in the event of an earthquake. As the garage sways during the earthquake, the door frame contacts the brackets mounted at the upper corners of the door. The brackets transfer shear forces from the frame to the door. Additional brackets mounted at the bottom corners of the door contact the lower portions of the frame and stop the horizontal movement of the garage door. By using the door to transfer the shear forces, the strength of the garage door frame is substantially improved.

Abstract: The present invention provides a combination of a door and door frame defining a door opening. The door frame comprises a horizontal header beam. The door opening has a horizontal top side and a horizontal bottom side, with the horizontal header beam defining the horizontal top side. The door comprises a top panel, a middle panel, a bottom panel, a first horizontal hinge member, a second horizontal hinge member and a third horizontal hinge member, each panel having a horizontal upper edge and a horizontal lower edge. The door is in the closed position when the top panel, the middle panel and the bottom panel are vertically aligned with one another and hanging downwardly from the horizontal header beam in a vertical plane of the door opening, with the horizontal upper edge of each panel above the horizontal lower edge of each respective panel, and the horizontal lower edge of the bottom panel is located in the lowermost position proximate to the horizontal bottom side of the door opening.

Abstract: A window frame assembly for installation within a garage door having front and rear exposed surfaces and one or more window openings. The assembly includes front and rear window frame members which are installed within the door opening on the front and rear exposed surfaces. The front and rear members are brought toward each other to sandwich the borders of the door panel defining the window opening and while also capturing an associated transparent pane. The rear frame member has a rib formed about an inner peripheral edge which is received in locking engagement within a cooperating peripheral groove provided on an inner side of the transparent panel. The rib and groove locking arrangement transfers impact forces on the pane to deformation forces on the front and rear frame members. A series of fastening members are used to hold the front and rear frame members securely against each other.

Abstract: An overhead bi-fold door assembly comprises an upper door frame and a lower door frame foldable relative to one another about a horizontal axis so as to be operable between a closed position and an open position in which the bottom end of the lower door frame is raised upwardly towards the top end of the upper frame member in relation to the closed position. Hinges which pivotally support the door each include a pair of leaves joining respective sets of knuckles in which the leaves span plural structural members of the respective door frames to provide added structural support to the door frames. Bushings are supported in the knuckles to receive the respective horizontal hinge pins of the hinges therein.

Abstract: Graphic design panels of the present invention include flexible material with “life-like” images printed thereon that decorate a sectional overhead garage door with a plurality of graphic design panels. The graphic design panels are affixed to the garage door so that a complete image of an object or of scenery is provided. The image selected for displaying on a sectional overhead garage door is divided into a plurality of sections and printed accordingly onto the flexible laminar substrate panels. The flexible laminar substrate panel is a polymeric material, for example, vinyl, and is impregnated with an adhesive on at least one face of the panel. “Life like” images are produced on the graphic design substrate panel by screen printing methods and the printed surface is protected by a graphic protection film.

Abstract: The safety shield is formed of an elongate L-shaped rail shield engaged to a vertical surface adjacent a vertical rail located within the interior of a garage door. An L-shaped panel shield is engaged to the interior of each garage door panel proximate to the vertical rail. The L-shaped panel shield is on the opposite side of the rail relative to the L-shaped rail shield. A generally U-shaped end covering shield may be integral or engaged to said L-shaped rail shield, where the L-shaped panel shields are positioned interior to the panel shield face side of the U-shaped end covering shield.

Abstract: The invention relates to a drive device, particularly for doors, garage doors, etc., comprising a guide device, particularly a rail or guide rail, extending in movement direction of the door. The invention is characterised in that the feed means comprises a first insert body which can be plugged at the ends of the guide rail into this and is provided with a connecting cable and which is held at the guide rail end and constructed in such a manner that it fulfils its function not only at one end of the guide rail, but also at the other end of the guide rail.

Abstract: A garage door panel has a frame and a one-piece front plate. The frame is made from a plurality of metal tubes. The metal tubes each have a rectangular cross-sectional shape and are adjoined in a manner providing the frame with a generally flat front surface and a generally flat rear surface and in a manner such that the tubes form a plurality of openings extending between the faces. The one-piece front plate is mounted on the frame at the front surface thereof and covers all of the openings. The front plate is made from a sheet of polymeric material and extends substantially beyond one of a top edge face of the frame and a bottom edge face of the frame.

Abstract: A swing type garage door has one or more of several features, including a door body rotationally connected to a door frame, the door body having one or more of: a trussing system having vertical and horizontal truss members, the horizontal members having openings through which the vertical members extend to distribute a load on the door body to the door frame in both a vertical and a horizontal direction; first and second sections hingedly connected with a hinge to allow ease in transport; a main door body section and a door load truss section hingedly connected at a bottom of the main door body to provide load trussing when the door is open; and at least one brace rotatably connected to the door body on an interior thereof and rotatable between a first bracing position and a second storage position to brace in high wind loading conditions.

Abstract: A roll-up door has a plurality of panels and a plurality of roller assemblies mounted to ends of the panels for mounting the panels in channels. At least some of the panels are formed of blow-molded thermoplastic material and have a relatively flat outside face and an inside face including ribs that extend longitudinally and transversely on the panel. A reinforced panel of thermoplastic material is made by blow molding a panel with a thermoplastic material to form a relatively flat outside face and a ribbed inside face, and with elongated channels along upper and lower walls thereof. The panel is trimmed while it is still warm to open the channels at one end. While the panel is still warm, reinforcing members are inserted into the elongated channels. The panels are cooled to shrink the channels onto the reinforcing members.

Abstract: A universal impact-resistant window assembly for a garage door of a type having a sheet-metal face skin includes a window assembly adaptable for installation in both insulated and non-insulated garage doors. The assembly includes an impact-resistant window pane, and an interior metal frame installed within and around a window opening in the sheet-metal face skin. An exterior metal frame is installed within and around the window opening in the sheet-metal face skin. The exterior metal frame cooperates with the interior metal frame to engage portions of the sheet-metal face skin that surround the window opening, and to retain the window pane. An exterior trim member substantially covers exterior portions of the exterior metal frame, and an optional interior trim member substantially covers interior portions of the interior metal frame.

Abstract: The present disclosure provides an improved sectional roll-up door system and related method. In one embodiment, the system includes hardware that enables a sectional roll-up door to be installed in situations wherein the door-to-ceiling clearance is very limited. In another embodiment of the present disclosure, the system includes hardware that minimizes stress and wear on a door installed in a multi-track system. A method of installing a sectional door in an area with limited ceiling clearance is also provided.

Abstract: A draft arrester for an overhead door. An exemplary embodiment may include a flexible draft curtain extending between a ceiling structure and a wound-up portion of the overhead door. The draft arrester may include a follower assembly, which may include one or more rollers arranged to roll against the overhead door. An exemplary embodiment may include a repositionable arm arranged to press the rollers against the wound-up portion of the door.

Abstract: There is provided a garage door comprising a front panel including a plurality of front panel members. Each front panel member defines panel member front and rear surfaces. The garage door also includes a plurality of frame assemblies. Each frame assembly is connected to a panel member rear surface. Each frame assembly includes a pair of rails and a plurality of stiles. Each rail includes a rail inner surface. The rail inner surfaces are disposed in opposed relation to each other. Each stile includes opposing end surfaces and a opposing stile inner surfaces. Each stile end surface is attached to a rail to form a plurality of frame opening peripheries. The garage door additionally includes a plurality of fasteners connect the frame assemblies to the front panel members. Pivot members are connected to adjacent ones of the plurality of frame assemblies to enable pivotal movement therebetween.

Abstract: The present invention relates to a door, in particular a sectional door, having a door leaf comprising a plurality of panels which are connected to one another and are guided in guide rails via rollers, with at least the topmost roller pair extending in separate guide rails over a part of its travel path during the opening or closing of the door.

Abstract: A garage door has pivotally connected door panels, with each of the door panels including an outer skin having an outer surface. The outer skin has a metal, such as steel, having a first coefficient of thermal expansion. An overlay element, such as a decorative element, is coupled to the outer surface of at least one of the outer skins. The overlay element includes a fiber-reinforced thermoset material having a second coefficient of thermal expansion. In one specific embodiment, the first and second coefficients of thermal expansion are substantially equal. In one embodiment, the overlay element includes a pultruded fiber-reinforced thermoset material. In yet another aspect, the overlay element is adhesively coupled to the outer surface. Adhesive coupling may, for example, include a hot-melt adhesive, a two-part glue, or double-sided adhesive tape.

Abstract: A garage door has pivotally connected door panels, with each of the door panels including an outer skin having an outer surface. The outer skin has a metal, such as steel, having a first coefficient of thermal expansion. An overlay element, such as a decorative element, is coupled to the outer surface of at least one of the outer skins. The overlay element includes a fiber-reinforced thermoset material having a second coefficient of thermal expansion. In one specific embodiment, the first and second coefficients of thermal expansion are substantially equal. In one embodiment, the overlay element includes a pultruded fiber-reinforced thermoset material. In yet another aspect, the overlay element is adhesively coupled to said outer surface. Adhesive coupling may, for example, include a hot-melt adhesive, a two-part glue, or double-sided adhesive tape.

Abstract: Overhead door assemblies having both interlocking and releasable guide assemblies, and multi-piece guide track assemblies for use with same are disclosed herein. An overhead door track configured in accordance with one embodiment of the invention includes a first side portion formed from a first piece of material and a second side portion formed from a second piece of material. The first side portion has a first guide surface and a first retention surface. The second side portion has a second guide surface and a second retention surface. In one aspect of this embodiment, the first side portion is joined to the second side portion to define an open channel or gap region therebetween. The first and second guide surfaces extend from the gap region toward a first direction, and the first and second retention surfaces diverge from the gap region toward a second direction, opposite to the first direction. The first and second retention surfaces can be configured to movably retain a door guide member.

Abstract: Overhead door assemblies having both interlocking and releasable guide assemblies, and guide track assemblies for use with same are disclosed herein. An overhead door track configured in accordance with an embodiment of the invention includes a first side portion spaced apart from a second side portion to define a channel or gap region therebetween. The first side portion has a first guide surface and a first retention surface. Similarly, the second side portion has a second guide surface and a second retention surface. In this embodiment, the first and second guide surfaces diverge outwardly from the gap region in a first direction, and the first and second retention surfaces diverge inwardly from the gap region in a second direction, opposite the first direction.

Abstract: A removable cover for a garage door vent or window, and preferably a cover for vents and windows in a garage door having embossed raised decorative panels incorporated into the door sections for decorative and aesthetic purposes, wherein the cover is slidingly received within a generally U-shaped in cross-section track externally mounted about the perimeter of the vent/window opening. Most preferably, the cover is formed of the rectangular piece of material removed from the garage door section to create the vent/window opening, such that with the cover in place over the vent/window, the decorative pattern and overall look of the door is virtually identical to the look of a door that is not provided with vents or windows. For garage doors having embossed raised decorative panels, the relatively large planar interior face portion of the raised panel having inwardly sloping sides is preferably removed to form the cover.

Abstract: A track for a roll-up industrial door. The track may include realigners adapted to divert the path of the industrial door as it is opened or shut. For example, a realigner may include a tapered portion to maintain a portion of the door within the track as the door is shut. Another realigner may have a tapered portion arranged to direct a portion of the door onto the track after it has been removed from the track. The tracks may be utilized in conjunction with a break-away industrial door having a flexible frame that is adapted to come out of the guide track upon application of a predetermined force.

Abstract: An operator for use in connection with a door system including an axle having an operator framework supporting an operator motor, the operator framework defining a clearance adapted to insertably receive the axle therein, a gear assembly defining a bore in which the axle is received and including a removable gear segment adapted to selectively medially open the bore to receive the axle, wherein the motor is interconnected with the gear assembly to cause rotation thereof.

Abstract: A garage door control system for a garage door that is adapted to be lifted by a garage door opener. The system has a motion sensor or electric eye sensor located at least in part proximate the garage door, for sensing an object located on top of a vehicle approaching the garage and projecting higher than is safe to enter the garage, and a cutoff switch that at least temporarily prevents the garage door opener from opening the garage door when the sensor senses an object located on top of a vehicle approaching the garage and projecting higher than is safe to enter the garage.

Abstract: A balance control system comprises a motor, a transmission system providing connection between the motor and the door and adapted to move the door between a closed position and an open position located above the closed position, a counterbalance system to reduce power required to lift the door, an apparatus to generate first signal representing a force used to move the door from the closed position to the open position, and to generate a second signal representing a force used to move the door from the open position to the closed position, and a controller responsive to the first signal and to the second signal to indicate an imbalance of the door when a difference between the first signal and the second signal exceeds a predetermined threshold.

Abstract: A system for signaling the position of a movable barrier includes a movable barrier; a motor coupled to the movable barrier for moving the movable barrier between limit positions; a position detection device that monitors the movable barrier to generate a barrier position signal; and an indication device that receives the barrier position signal and indicate a position of the movable barrier relative to the limit positions. The system also includes an operation mechanism for controlling the motor and at least one transmitter device which generates a transmission signal received by the operator mechanism to energize the motor. The system further includes a blocking switch which generates a blocking signal received by the operator mechanism to prevent receipt of a transmission signal from a device other than one associated with the indication device.

Abstract: A radiation transmitting or sensing element is placed in a generally elongated holder of resilient material so that, if it is distorted by an accidental impact or otherwise, it will automatically re-orient itself when the intruding force is released. The invention is especially useful in safety accessories for automatic overhead doors, garages, and the like.

Abstract: A door drop stop safety system which is adapted to be installed on existing building overhead doors which employ a central axle; slab doors, bifold doors, and rollup doors which contains structure for raising and lowering the the door including a rewind box including an inertia reel and a length of strap. The inertia reel allowing normal motion, but is adapted to lock as soon as a predetermined rate of rotation is reached due to the door beginning to free fall. The system includes structure means for mounting the rewind box on an existing door, including slab doors, bifold doors, and rollup doors.

Abstract: A driving system for a garage door includes a track having an end fixed on an inside of a wall and has an open side that faces upward. A driving assembly is movably received in the track and driven by a motor. The driving assembly includes a connection member to which two ends of a power transferring member are connected. A U-shaped member is movably engaged with the track from an underside of the track and two sides of the U-shaped member are connected to the driving assembly. A link is pivotably connected between the U-shaped member and the garage door. The power transferring member reeves a gear which is rotatably connected to the track and the motor has a driving shaft which is conveniently extended through an opening of the track and engaged with an engaging hole of the gear.

Abstract: A door system (10) used in connection with an opening defined by a pair of jambs (11) and a laterally extending header (12) connecting the jambs, the door system including, a pair of tracks (15) mountable on the jambs, the tracks having a vertical track section (16) running adjacent the jambs, wherein a space (25) is defined between the tracks and the jambs along at least a portion of their length, a door (D) mounted for movement on the tracks and movable between an open position and a closed position, and a shield (30) mounted laterally outward of the tracks and adjacent thereto, the shield extending rearward from the jamb and overlying at least a portion of the tracks along the length of the vertical track section, wherein the overlying portion of the shield contacts the vertical track section along the length thereof.

Abstract: A hamper/sorter (15) for storing and sorting laundry which loads from the front with one or more openings is described. The hamper/sorter (15) is comprised of the main body and two moveable doors, one upper flexible door (5) that slides vertically and a lower rigid door (4) that can be stowed horizontally under the hamper/sorter (15). During operation, the doors adjust the front openings to allow for small or large laundry items to be loaded and unloaded for storing or washing. The upper and lower door edges that meet together are formed at an angle opposite of each other so that the upper door (5) overlaps the lower door (4). A stop plate (14) is installed on the upper door (5) to keep the doors in the normally closed position. This invention is versatile enough to be used as a hamper or sorter in any location that permits its mounting. One or more of these hamper/sorters (15) can also be mounted together in a horizontal row to provide a sorting system.

Abstract: The invention includes a clasp that can be mounted to the roller track of an overhead door and a shim that can be mounted to the overhead door or the shaft of the roller. The clasp includes a portion for attaching to the roller track and a blocking portion that is secured in proximate location to the inner surface of the overhead door. When the overhead door is in a closed position, the shim and the blocking portion are engaged thereby encouraging the overhead door towards the door frame. Multiple clasp and shim assemblies can be mounted to the overhead door to improve the seal between the overhead door and the door frame.

Abstract: A ratchet-like assembly for winding a counterbalancing mechanism of a door. The ratchet-like assembly includes at least one plate, at least one ridge, an actuator, and at least one pawling element. Each plate is operatively mounted onto a fixed structure and includes an orifice through which extends a shaft of the counterbalancing mechanism and about which the shaft is rotatable along opposite first and second directions of rotation. Each ridge is provided about an outer edge of the corresponding orifice. The actuator is operatively connected to each plate and is operable between a locked configuration and an unlocked configuration. Each pawling element is mounted onto the actuator and is positioned within a corresponding ridge, adjacent to the shaft.

Abstract: Doors and breakaway mechanisms for use with a door are disclosed. A disclosed door includes a panel; a guide located adjacent a doorway opening; a carriage; and a coupling releasably securing the carriage to the panel. The coupling releases the panel from the carriage in response to a breakaway force. The magnitude of the breakaway force is dependent on a condition such as the position of the door relative to the doorway or the position of a roller carried by the carriage.

Abstract: The invention relates to a safety edge for horizontally pivoted rolling gates actuated by a motor unit. It consists of a profile (11) made of rubber or other soft flexible material and having a base (14) for its application to a rolling date, and of two electrical conductors (15, 16) extending longitudinally into the soft profile, parallel and normally separate from one another. The conductors move closer in the presence of a deforming thrust on said profile, to come into contact and enable an electrical circuit to send a signal for stopping the rolling gate motor unit.

Abstract: A track guard for a sectional overhead door assembly comprises an elongate member which may be positioned between the vertical track sections of the door assembly and a wall jamb to which the vertical track sections are mounted to cover the space therebetween. The track guard has a generally C-shaped cross-section and has a width which tapers from a first end to a second end to accommodate variations in spacing between the vertical track sections and the wall jamb.

Abstract: A cable tension sensing apparatus is mounted on a wall having a door opening. The jack shaft garage door operator includes a drive unit having an electric motor for driving a jack shaft mounted above a door opening. A pull-up cable drum is connected to the jack shaft and has a multi-strand steel pull-up cable that may be payed out to lower a door or wound up to raise the door. The cable tension sensing apparatus includes a cable guide to retain the cable a substantially fixed distance from the wall and a spring driven cable follower which urges against the cable extending between the drum periphery and the cable guide. An alerting switch is connected to the cable follower and sends a signal indicating loss of cable tension when the cable follower moves beyond a predetermined distance. Additionally, the movement of the cable follower moves a door blocking arrangement to a position to block movement of the door when being raised without use of the motor.

Abstract: A sealing device for a door, and in particular for a garage door, for sealing the door and frame to facilitate the exclusion of elements, such as, for example, draughts, wind, rain, snow, insects, and the like, with a first part or base provided for mounting to a supporting surface, and a second part constructed to attach to the first part, the second part carrying a sealing element.

Abstract: A door system including a door movable between a closed vertical position and an open horizontal position, a cable interconnected to said door near the bottom thereof, the cable extending along a vertical line adjacent the door and being normally, substantially taut, and an anti-drop assembly having a pawl pivotally supported on the door, a stop surface formed adjacent the door and a spring operable to urge the pawl toward engagement with the stop surface, wherein the pawl is oriented such that it rotates in a plane passing through the cable and placed in contact therewith such that the taut cable opposes the biasing force of the spring, whereby upon the cable going slack, the spring biases the pawl into engagement with the stop surface to decelerate the door.

Abstract: A guiding mechanism for use in combination with an industrial door that includes an extension member extending across a doorway when the door is in a doorway blocking position is provided. The guiding mechanism includes a guard bracket extending along the doorway and having a mounting segment and a guard segment, and a track extending along the doorway and including a guideway for receiving a roller of the extension member and for guiding the roller as the door moves between blocking and unblocking positions. The track is affixedly mounted to the mounting segment such that the guard segment protects the track from an obstacle during a track impact condition.

Abstract: A mounting system for the safety beam units of a garage door opener, the mounting system having two brackets, each bracket having a base with a circular opening and a support, the supports of both brackets being adjustably coupleable together. The mounting system also has a beam unit housing with a cylindrical mounting base fittable through the circular opening in the base of at least one of the brackets. A spring is coupled to the cylindrical mounting base, the spring having at least one end extending beyond a side of the cylindrical mounting base. The beam unit housing being held in position by the at least one spring end extending into contact with the base of least one bracket.

Abstract: A drive system for closing devices, for example gates or shutters, with a variable speed output drive and a device for detecting a given characteristic of the drive, and is varied to maintain a substantially constant speed of the closing device as it moves between the open position and the closed position.

Abstract: A door system including, a door movable between a closed vertical position and an open horizontal position, a cable attached to the door and normally providing a counterbalancing force to the door, the cable extending along a vertical line adjacent the door and being normally substantially taut, and an anti-drop assembly having a pawl pivotally supported on the door and attached to the cable, a stop surface positioned adjacent to the door, and a spring operable to urge the pawl toward engagement with the stop surface, wherein when taut the cable opposes the biasing force of the spring and wherein upon the cable going slack the spring urges the pawl into engagement with the stop surface to decelerate the door.

Abstract: A locking mechanism includes a frame having a movement obstruction arm movable into a track on which rollers of an overhead door will move. When any roller on the door abuts against the arm, it will obstruct any further opening movement of the overhead door. A camming means is associated with the movement obstruction arm to automatically shift the same to a position out of the trackway when the door is moving back to the closed position. A control module is operable with the locking mechanism and receives a signal from a locking mechanism indicative of whether or not the locking mechanism is opened or closed. The control module will thereupon provide an opening signal to an opener for the overhead door.

Abstract: A bottom weather seal for doors comprised of independent, vertically moving adjacent blocks capable of engaging and sealing an uneven garage floor or sill. Each block has a vertically-running tongue on each side, which engages the vertically running tongues of each adjacent block, thereby providing a guide and seal for and with each adjacent block. Each block is moveably attached to a door by a screw attached to the door, and which passes through a pre-cut slotted opening cut in each block.

Abstract: Doors and breakaway mechanisms for use with a door are disclosed. A disclosed door includes a panel; a guide located adjacent a doorway opening; a carriage; and a coupling releasably securing the carriage to the panel. The coupling releases the panel from the carriage in response to a breakaway force. The magnitude of the breakaway force is dependent on a condition such as the position of the door relative to the doorway or the position of a roller carried by the carriage.

Abstract: The invention is directed to a retractable door assembly in a panel van type of vehicle comprising a cargo area having at least one door opening for access thereto. The retractable door assembly is positioned in at least one door opening, with the retractable door assembly comprising a flexible door member slideable between open and closed positions within opposing track assemblies. Access to the cargo area is provided by selectively sliding the flexible door to the open position. The vehicle conversion system comprises a retractable door assembly of predetermined dimensions, and a frame assembly selectively secured in a door opening of a vehicle. The retractable door assembly is mounted to the frame assembly to substantially close the door opening. A method of vehicle conversion is also set forth, comprising the steps of providing a door opening in a vehicle, and securing a frame assembly in association with the door opening.

Abstract: A device for sealing a door or window casing by means of an insect-repellent gauze screen. The device comprises a rectangular insect-repellent gauze screen that is secured with one end to a roller rod, around which it can be wound and unwound, and with the other end to a pulling beam, which is provided with two handles. The roller rod is accommodated in a first frame section to be placed vertically. The pulling beam can be slid against a second frame section to be placed opposite the first frame section. The device further comprises a third and a fourth frame section, which possess a U-shaped guide section, in which an edge of the gauze screen is guided. The device comprises securing means so as to enable the fitting of the frame sections before the casing. The securing means are mounted on an inner wall of the casing, in particular on the transverse side of decorative parts present around the easing.

Abstract: A releasable vertical lift overhead door for an opening of a structure includes a plurality of tracks with one of a pair of the tracks adapted to be disposed on a side of the opening of the structure and another of the pair of the tracks adapted to be disposed on another side of the opening and at least one door leaf disposed between the pair of the tracks. The releasable vertical lift overhead door also includes a release assembly attached to the at least one door leaf on each side thereof. Each release assembly has a support bracket attached to the at least one door leaf and a guide bar disposed within the support bracket for receiving a portion of one of the tracks to guide movement of the at least one door leaf along the tracks. The guide bars releasably disengage the pair of the tracks when a force of a predetermined magnitude is applied to the at least one door leaf.

Abstract: A sports equipment assembly is disclosed. The assembly comprises a garage door, various types of sports equipment, and means for mounting the sports equipment to the door.

Abstract: A counterbalance system for an upward-acting door includes spaced-apart wall brackets and cable drums supported on the brackets and connected to flexible cables which depend from the drums and connected to the lower side edges of an upward-acting sectional garage door. One or both of the cable drums may be connected to one end of a torsion coil spring and the opposite end of each spring is connected to a hub assembly. Elongated spring winding and protective cover tubes are sleeved over the springs and are connected to the brackets by worm-gear drive winding mechanisms, respectively, for rotating the tubes to effect winding of the torsion coil springs through the hub assemblies but preventing rotation of the tubes during normal operation of the counterbalance system. The cable drums and spring hub assemblies may be supported on an elongated synchronizing shaft or a torque transfer shaft extending between and supported on the wall brackets.