Movably Mounted Track Patents (Class 160/194)
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Patent number: 11053733Abstract: A system comprising: a sliding shield equipped with horizontally sliding cloth movable by means of a handle bar between a lateral box and a closure upright, and a guiding and tensioning retractable device for sliding shields comprising a plurality of first guiding modules and a plurality of second guiding modules, consecutively and alternately coupled between them forming a guiding body foldable and insertable within the handle bar and comprising a first terminal end fixable to the lateral box and a second terminal end adapted to be free of sliding within the handle bar, the first guiding modules and the second guiding modules being interposable between the handle bar and the lateral box. The sliding shield comprises at least a lower pocket and the guiding and tensioning retractable device comprises at least a tensioning element provided with a first end anchored to the second terminal end and a second free end inserted within the lower pocket.Type: GrantFiled: April 27, 2017Date of Patent: July 6, 2021Assignee: MV LINE S.p.A.Inventor: Paolo Montanaro
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Patent number: 10876339Abstract: An overhead garage door opening and closing system for a building structure having a track system comprising a pair of spaced apart tracks; a plurality of hinged door panels hingedly connected together to form the door; a plurality of track wheel assemblies disposed at said door panels, wherein each of said plurality of track wheel assembly comprises a shaft and a wheel rotatably mounted at said shaft and rotatable about an axis of rotation of said wheel, and wherein said door panels move along said tracks via rolling engagement of said wheels of said track wheel assemblies with said tracks as said door panels move between an opened position and a closed position; wherein said track wheel assemblies, when disposed at said door panels, are configured to allow for movement of the respective door panel relative to said wheels in a direction generally normal to said axes of rotation of said wheels and generally normal to a direction of travel of said wheels along said tracks; a door moving assembly that functionsType: GrantFiled: November 18, 2016Date of Patent: December 29, 2020Inventors: Daryl W. Bruckelmyer, David M. Sundberg
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Patent number: 10731807Abstract: An electrical connection device connects to a sectional door, the sectional door having a plurality of connected panels which roll along left and right tracks which are connected to a structure, the sectional door is positionable to a closed position and to an open position. The electrical connection device includes a slide which carries a reciprocating electric contactor. A housing has a slot, a proximal end and an opposite distal end. The slide slides along the slot in the housing. A spring in the housing biases the slide toward the distal end of the housing. The housing is connectable to either the left track or to the right track of the sectional door.Type: GrantFiled: December 24, 2018Date of Patent: August 4, 2020Inventor: Graham Holloway
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Patent number: 10717386Abstract: Apparatus for connecting a wiring harness to a sectional door is disclosed. The sectional door has a plurality of panels in which adjacent panels are connected by a hinge, the hinge is connected to the adjacent panels by first and second hinge connectors. The apparatus includes a first bracket which has a proximal end and an opposite distal end, the distal end is shaped and dimensioned to receive the wiring harness. The proximal end of the first bracket is connectable to the hinge by the first hinge connector. A second bracket has a proximal end and an opposite distal end, the distal end is shaped and dimensioned to receive the wiring harness. The proximal end of the second bracket is connectable to the hinge by the second hinge connector. The wiring harness is connected to the distal ends of the first and second brackets, thereby providing strain relief for the wiring harness.Type: GrantFiled: July 23, 2018Date of Patent: July 21, 2020Inventor: Graham Holloway
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Patent number: 9004429Abstract: A mounting device for installing a track for a curtain or blind has an engagement portion for cooperation with the track by a snap-type engagement. A resiliently deformable release means has a tongue portion (29) that has a free end that is positioned in a cavity of the track when the engagement portions are fully mutually engaged and a connected end that is connected to the mounting portion and spaced from the free end and that is positioned externally of the cavity of the track when the engagement portions are fully mutually engaged. The tongue portion (29) has an abutment face (33) disposed for assisting with prising apart the mounting device and the track by turning a tool, simultaneous with the operation of the tool against the tongue portion. The abutment face is opposed to and spaced from the track in use.Type: GrantFiled: March 18, 2011Date of Patent: April 14, 2015Assignee: MCP New Zealand LimitedInventor: Roger F. Dennison
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Patent number: 8662138Abstract: The present invention is to facilitate the attachment and maintenance work of left and right sheet guides of a shutter and to facilitate the return of the disengaged sheet. A sheet guide of a sheet shutter according to the present invention is a mechanism configured such that a sheet 2 is lifted and lowered by being wound and unwound around a sheet drum 5 supported between left and right support posts 3 and 3 according to the rotation of the sheet drum 5, and such that both the left and right ends of the sheet 2 are lifted and lowered by being guided by sheet guide sections 11 and 11 respectively installed in the support posts 3 and 3.Type: GrantFiled: November 4, 2010Date of Patent: March 4, 2014Assignee: Komatsu Electric Industry Co., Ltd.Inventors: Akio Komatsu, Hitoyuki Adachi, Yoshiaki Horie, Takeshi Fujii
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Patent number: 8443909Abstract: A fire shutter adapted to close off an area comprises a shutter curtain movable from an up position to a closed position, wherein the shutter curtain closes off the area when in the closed position, and at least one retractable guide, movable from a retracted position to an extended position and having a camber. The shutter curtain engages the at least one retractable guide as the shutter curtain moves from the up position toward the closed position, biasing the at least one retractable guide to the retracted position, and in the closed position the shutter curtain engages the camber and allows the at least one retractable guide to move to the extended position. The shutter curtain can also comprise front slats and rear slats, and an insulation package can be deployable from a non-deployed position to a deployed position within a space between the front slats and the rear slats.Type: GrantFiled: May 14, 2010Date of Patent: May 21, 2013Assignee: Gliderol Doors (S) Pte LtdInventor: Lok Yung Wong
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Patent number: 8360132Abstract: A high-speed door assembly has a shaft or drum having a longitudinal axis which is configured so that the longitudinal axis is parallel with a wall to which the door assembly is mounted. A flexible door panel is attached to the shaft or drum so as to be capable of being wound and unwound about the drum for selectively permitting and prohibiting access through an opening in the wall to which the door assembly is mounted, the door panel being wound on the shaft or drum in an orientation such that the door panel defines at least one vertical plane when unwound from the shaft or drum, the vertical plane being spaced further from the wall to which the door assembly is mounted than the longitudinal axis of the shaft or drum.Type: GrantFiled: December 27, 2007Date of Patent: January 29, 2013Assignee: Rytec CorporationInventor: Brian Norbert Drifka
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Publication number: 20120318467Abstract: A divider system having a track beam with opposed ends and parallel tracks along its length. The ends are removably mounted to opposed walls and below the ceiling. Light weight translucent or transparent polymeric panels are provided having substantially frameless side and bottom edges. Each panel is slidably mounted at its top edge to a track of the track beam and slides between the opposed walls on its own track, independently of the other panels. The planar surfaces of the panels are parallel to the track beam and the bottom edges are spaced a distance from the floor. The widths of the panels when added together are at least equal to the length of the track beam and can be positioned along the beam to permit complete closure of the space between the walls or to overlap each other to provide an opening through the space between the walls.Type: ApplicationFiled: October 26, 2011Publication date: December 20, 2012Inventor: Adrian Mario Levin
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Patent number: 8316913Abstract: A sliding screen door includes a net formed to be capable of expansion and contraction, and capable of freely opening and closing by horizontal pulling, a net guide is formed to be able to form the net guide into a straight line shape, and a movement of a net holding member that follows the net guide is made smooth, and many of the guiding elements form the net guide for guiding the lower end of the net into an approximately U-shape composed of a bottom portion and rising wall portions, and a mutually and flexibly connected by means of inserting a series of wire members into through holes that follow tip end portions of the rising wall portions, and are formed into a series of guides rails that are serially in contact with each other and a net holding member is provided in the aforementioned guide rail.Type: GrantFiled: September 19, 2008Date of Patent: November 27, 2012Assignee: Seiki Hanbai Co., Ltd.Inventors: Mitsuhiko Chino, Hirotsugu Toda, Masato Moriya, Yoji Kamosawa
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Patent number: 8316915Abstract: The present invention is directed to an industrial high-speed door assembly having a reduced door panel width and having guides for guiding the door which extend into a passageway but are resilient, tough, or resiliently collapsible, to either withstand impacts from vehicle collisions or moveable during opening of the door to avoid collisions while returning for guidance upon closing the door.Type: GrantFiled: July 30, 2007Date of Patent: November 27, 2012Assignee: Rytec CorporationInventors: Brian Norbert Drifka, Arno Klein, John Sonn, Donald P. Grasso, Daniel J. Gregoriou, Walenty Kalempa
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Patent number: 8196638Abstract: The present invention relates generally to barriers for architectural openings, in particular to a screen apparatus and method for screening off an architectural opening. The screen apparatus includes an elongated overhead frame member, a transverse fixed side frame member, a displaceable side frame member, and an elongated articulated bottom frame member. A screen member extends between the frame members, the screen member being interchangeable between a collapsed condition when the screen is open and an extended condition when the screen is closed by movement of the displaceable side frame member.Type: GrantFiled: April 2, 2010Date of Patent: June 12, 2012Inventors: Anthony Gerard Roberts, Kevin Burnside, Chris Bonython
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Publication number: 20110203746Abstract: Movable partitions and partition systems include a sheet of interconnected panels configured to fold in an accordion fashion. At least two of the interconnected panels have first and second lateral ends extending between a top edge and a bottom edge of the panels. The lateral ends may comprise generally cylindrical structures having openings comprising gaps between lateral edges of the respective panel and a first major surface of the respective panel. The first lateral end of one panel may be engaged with the second lateral end of another panel of the at least two panels. The lateral edges may be enlarged. The at least two panels can extend to a fully extended state in which they are coplanar. Methods of forming movable partitions and partition systems include forming and interconnecting such panels. Methods of repairing movable partitions and partition systems include disengaging such panels by applying lateral forces therebetween.Type: ApplicationFiled: February 25, 2010Publication date: August 25, 2011Applicant: WON-DOOR CORPORATIONInventor: R. Scott Smart
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Patent number: 7963312Abstract: A screen is made to be able to be changed in a state in which the screen is made to be detachable from a screen attaching frame portion, a first connector is arranged at one end extracted from the screen of screen tension members penetrating the screen at a plurality of portions in a length direction, the one end is connected to a vicinity of a free end of a slide guide frame portion, other end of a jump member extracted to a screen attaching side is arranged with a second connector, the first connector and the second connector are made to be attachable and detachable to and from each other, and the slide guide frame portion is extracted from inside of the screen attaching frame portion.Type: GrantFiled: June 21, 2007Date of Patent: June 21, 2011Assignee: Metaco Inc.Inventors: Yasubumi Okachi, Yuichiro Nishioka
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Patent number: 7931070Abstract: In a sliding screen door in which a net is formed to be capable of expansion and contraction, and is formed to be capable of freely opening and closing by horizontal pulling, a net guide forms the net guide into a straight line shape in a condition of being led out from a frame member, and a movement of a net-holding member that follow the net guide is made smooth, and many of the guiding elements form the net guide for guiding the lower end of the net and include an approximately u-shape composed of a bottom portion and rising wall portions, and are formed into a series of guide rails that are serially in contact with each other by means of rising wall portions of the adjoining guiding elements, and a net-holding member which is engaged with the guide rails so as to be movable along the guide rail.Type: GrantFiled: October 20, 2004Date of Patent: April 26, 2011Assignee: Seiki Hanbai Co., Ltd.Inventors: Mitsuhiko Chino, Hirotsugu Toda, Masato Moriya, Yoji Kamosawa
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Patent number: 7810542Abstract: A flexible guide (1) for a mosquito net (100) of a type which is fixable to a window opening, comprising a plurality of rigid adjacent links (2a, 2b, 200), in which each link (2a, 2b 200) exhibits a pair of opposite flanks (5a, 5b, 205) which between them receive the mosquito net (100), and a connecting portion (6, 206) arranged transversally and fixed to the flanks (5a, 5b), each link (2a, 2b, 200) being provided with a seating (4, 204) for receiving a flexible strap element (3, 203) in order to form, with adjacently-situated links (2a, 2b), a single chain.Type: GrantFiled: February 20, 2007Date of Patent: October 12, 2010Assignee: I.R.S. S.p.A.Inventor: Nardo Bonini
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Patent number: 7810543Abstract: A roller screen device includes a fixed sectional element (10) and a mobile sectional element (11) that is able to move parallel to the fixed sectional element inside a frame contained in which is a screen (13), the mobile sectional element (11) bearing a roller (12) inside it, wound on which is the screen (13), which, at the other end, is anchored to the fixed sectional element (10). Guide elements (14 and 24) for guiding the mobile sectional element (11) are positioned at the top and at the bottom of the screen (13) and fixed at one end to the mobile sectional element (11), while the other ends of the guide elements (14) slide into the fixed sectional element (10). Moreover provided is a system for tensioning the guides (14 and 24), which acts during the steps of opening and closing of the screen (13).Type: GrantFiled: December 11, 2007Date of Patent: October 12, 2010Assignee: Effe S.r.l.Inventors: Francesco Donatelli, Samuele Donatelli, Michele Motolese
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Patent number: 7669632Abstract: A lateral pull wire screen with a net attached, between a first longitudinal frame member in a wire screen frame and a movable frame for an opening/closing operation, to be openable/closable by a lateral pull; a net guide guiding the lower end of the net goes in and out in compliance with the opening/closing of the net. The left/right convenience in the net opening/closing can be altered by the first longitudinal frame member and the movable frame, together with the net attached between them, having substantially upside/downside symmetrical shapes, and reversing them in their upsides/downsides without reversing their fronts and backs. Also, the net guide can be altered in its attachment position by, upon the upside/downside reversions, selectively attaching the net guide to attachment parts provided in both ends of the first longitudinal frame member fixing one end of the net guide.Type: GrantFiled: October 7, 2004Date of Patent: March 2, 2010Assignee: Seiki Sogyo Co., Ltd.Inventors: Takashi Moriya, Hirofumi Moriya
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Publication number: 20090038764Abstract: The present invention is directed toward a track assembly comprising two nested tracks, an inner track and outer track. The assembly is designed so that the outside width of the outer track is equal to or less than the outside width of the inner track to present a substantially flush external surface for attachment of exterior sheathing elements when the assembly is used in an external wall. The system may further comprise a strap or series of engaging surfaces on the inner and outer tracks that generally restrain the inner track relative to the outer track.Type: ApplicationFiled: February 29, 2008Publication date: February 12, 2009Inventor: Don A. Pilz
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Patent number: 7416014Abstract: The invention relates to a shutter device intended to close a bay (6) or other opening, with flexible edges (2, 3) projecting with respect to the plane of the shutter (1) and collaborating with guideways (4, 5), at least one reintroduction element (12) being provided, allowing the said edges (2, 3) to be reintroduced into the guideways (4, 5) when these edges (2, 3) become disengaged from the latter under the action of a force exerted on these edges (2, 3) in a direction transverse to the guideways (4, 5), a contact area (37) being formed during this reintroduction between the reintroduction element (12) and the corresponding edge (2, 3), characterized in that the lateral edges (2, 3) consist at least partially of an elastomeric material so that the said contact area (37) increases as the said force increases, spreading this force over the contact area (37).Type: GrantFiled: March 17, 2003Date of Patent: August 26, 2008Assignee: Dynaco International, S.A.Inventor: Benoit Coenraets
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Patent number: 7409981Abstract: The invention relates to a shutter device intended to close an opening, the shutter (1) being able to be moved downwards and upwards between an open position and a closed position, this shutter (1) having flexible or articulated roughly continuous lateral edges (8, 9) running with respect to guideways (10, 11) mounted on fixed supports (12) on each side of the opening, means being provided to allow a passage to be created between the guideways (10, 11) that is wider than the distance between the lateral edges (8, 9) of the shutter (1) when the latter is in the open position.Type: GrantFiled: December 11, 2002Date of Patent: August 12, 2008Assignee: Dynaco International S.A.Inventor: Benoit Coenraets
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Publication number: 20080105387Abstract: Movable partitions and various components for use with movable partitions are disclosed along with related systems and methods. In one embodiment, a track and trolley system for use with a movable partition is described. In one embodiment, the track and trolley system may include a track having three channels wherein a first partition is suspended from the first channel, a second partition is suspended from the second channel, and a trolley is partially disposed in the third channel and between the first and second channels. Seal components may be used to substantially provide a fluid seal between the partitions and a surface from which the partitions are suspended. The trolley is configured to be longitudinally displaceable along the third channel while maintaining its components within an envelope defined by the seal components. In other words, such seal components are not penetrated or otherwise breached by the displaced trolley.Type: ApplicationFiled: November 2, 2007Publication date: May 8, 2008Applicant: WON-DOOR CORPORATIONInventors: W. Michael Coleman, E. Carl Goodman
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Patent number: 7128125Abstract: A durable sealing curtain assembly preferably comprising a pair of tracks slidably attached to opposite sides of an opening such as a door or window, a curtain having its lateral edges engaged by the tracks, and spring systems attached to each track, whereby the spring systems urge the tracks outwardly to maintain the curtain taut yet allow the tracks to slide inwardly towards the center of the opening so that the curtain does not endure excessive pressure upon application of an external force. At least one track preferably also comprises a cam mechanism that is operative to urge the track inwardly to release tension from the curtain and thereby allow the curtain to be more easily raised or lowered, after which, the cam mechanism can be disengaged to allow the track to return to its outwardly biased position, thus returning the curtain to a taut condition.Type: GrantFiled: March 9, 2004Date of Patent: October 31, 2006Inventor: Charles Harbison
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Patent number: 6698490Abstract: 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.Type: GrantFiled: November 21, 2001Date of Patent: March 2, 2004Assignee: Rite-Hite Holding CorporationInventors: Bill Hoerner, Tom Jansen, Perry Knutson, Steve Lester, Ronald P. Snyder, Donald P. Grant
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Publication number: 20030019181Abstract: An improved flyscreen to be slidingly deployed across an opening of window or door, the window or door having a static glazing pane or panel and an opening pane or panel, the flyscreen comprising a frame dimensioned to correspond to the dimensions of the window or door opening to be covered by the flyscreen and having a mesh screen therein extending thereacross, the frame having a brush or filamentous pad strip extending substantially the full height of an upright of the frame and which when the screen is slidingly mounted adjacent to a window or door to be slidingly moved back and forth across the opening of the window or door, is substantially able to brush over the surface of the static pane or panel of the window or door.Type: ApplicationFiled: December 6, 2001Publication date: January 30, 2003Inventor: Conrad Peter Martin
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Patent number: 6321822Abstract: A release mechanism for use in combination with an industrial door, which includes an extension member extending across the doorway opening when the door is in its doorway-blocking positions, the releasing mechanism including a roller mounted for movement with the extension member, and a track including a guideway for receiving the roller and guiding it during normal door operation, the roller and track being movable relative to each other upon application of a breakaway force to the extension member, thereby allowing the roller to escape from the track when a breakaway force is applied to the extension member, the breakaway force being defined as a force that has a component perpendicular to the plane of the door above a certain magnitude.Type: GrantFiled: April 3, 2000Date of Patent: November 27, 2001Assignee: Rite-Hite Holding CorporationInventors: Bill Horner, Tom Jansen, Perry Knutson, Steve Lester
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Patent number: 6318438Abstract: A net guide 12 is guided along the lower end of an expandable net 4 folding in alternate directions counter to each other, made capable of opening/closing sideways is formed as a long member having a U-shaped cross-section including a shaking preventive section 12a and a bottom 12b. Concave notches 12c arranged at certain intervals are out in the shaking preventive section 12a.Type: GrantFiled: April 18, 2000Date of Patent: November 20, 2001Assignee: Seiki Hanbai Co., Ltd.Inventors: Akihiko Uno, Mitsuhiko Chino
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Patent number: 6186212Abstract: A screen is mounted between a pair of screen mounting frames, at least one of which is slidable. One or more sliding guide frames are disposed near an end of the screen which is not mounted to the screen mounting frames. Each sliding guide frame is formed by connecting rigid units, each of which has a pair of sidewalls and a bridging portion, and thereby each sliding guide frame has rigidity and a bending ability. The sliding guide frame also has at least a free end at one end and is capable of being received in and withdrawn from inside one of the screen mounting frames. A stopper mechanism provided for the rigid units preserves straightness of a withdrawn portion of each sliding guide frame.Type: GrantFiled: November 1, 1999Date of Patent: February 13, 2001Assignee: Metaco Inc.Inventor: Osamu Tsuchida
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Patent number: 5890323Abstract: The present invention relates to the design of a modern theater for providing live entertainment performances. The theater comprises an auditorium which is defined in part by a modular central core which encloses a defined space. The theater further comprises a modular stage and a two-tier balcony module. The central core module, the stage and the balcony module are each supported by independent foundations and load bearing columns. The balcony module includes an upper level with open seating and a lower level with enclosed suites. The suites are designed so as not to adversely affect the acoustics of the theater. The theater also has two side wing modules for increasing the seating capacity of the theater and other modular structures abutting the central core module. The theater also includes partitions for closing part of the side wing modules and a novel jack system for supporting the acoustic panels forming the partitions when the panels are in their extended position.Type: GrantFiled: July 1, 1997Date of Patent: April 6, 1999Inventor: Robert M. Errato
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Patent number: 5887385Abstract: An improved release mechanism for use in combination with an industrial door, which includes an extension member extending across the doorway opening when the door is in its doorway-blocking positions, the releasing mechanism including a roller mounted for movement with the extension member, and a track including a guideway for receiving the roller and guiding it during normal door operation, the roller and track being movable relative to each other upon application of a breakaway force to the extension member, thereby allowing the roller to escape from the track when a breakaway force is applied to the extension member, the breakaway force being defined as a force that has a component perpendicular to the plane of the door above a certain magnitude.Type: GrantFiled: May 28, 1996Date of Patent: March 30, 1999Assignee: Rite-Hite Holding CorporationInventors: Bill Horner, Tom Jansen, Perry Knutson, Steve Lester
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Patent number: 5170829Abstract: A rack guard for a pallet rack employs a retractable safety net. The net is clipped to carriers which traverse along vertical tracks offset from the pallet rack. The tracks are pivotally mounted with respect to the pallet rack to permit pivotal displacement of the tracks to a position adjacent the support posts of the rack.Type: GrantFiled: February 19, 1991Date of Patent: December 15, 1992Assignee: Sinco IncorporatedInventors: Charles W. Duncan, John F. Starr, John B. Ebbesmeyer, Barry A. Cole
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Patent number: 4880046Abstract: The present invention sets forth a garage door sealing apparatus wherein a plurality of electric motors are integrally secured to each door track of a typical garage reciprocating door. Upon closing of the door, the plurality of electric motors each pull the associated track into engagement with the framework of the garage and wherein movement is halted upon the associated door contacting at least one limit switch. This arrangement pulls the garage door into sealing engagement with the associated framework to minimize heat loss through a garage.Type: GrantFiled: September 26, 1988Date of Patent: November 14, 1989Inventor: Jerry Gesy
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Patent number: 4698117Abstract: An apparatus for installing table skirts to the perimeter of a banquet table having a fastener with an adhesive pile material substantially similar to an adhesive pile material on a top underside of the table skirt. The table skirt is wound in an upward direction on a hanging device having strips of adhesive pile material substantially similar to both the adhesive pile material of the fastener and of the table skirt. Once the table skirt is hung on the hanging device, the device is placed on a swivel hook attached to a rod mounted on a moveable rack in a manner so that the hook turns as the table skirt is unwound from the hanging device and the adhesive pile material of the table skirt and fasteners are pressed together as an installer moves around the perimeter of the table. To disassemble the table skirt from the table, the procedure is reversed by choosing a free end of the table skirt and pulling it apart from the adhesive material of the fastener and attaching it to the hanging device.Type: GrantFiled: February 24, 1986Date of Patent: October 6, 1987Assignee: Prestige Skirting and Tablecloths Inc.Inventor: Brent M. Enison
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Patent number: 4016920Abstract: A sectional door assembly, of the variety having a plurality of interconnected sections which are movable between a closed position and an open position. A flexible guide track is included on both sides of the door for guiding and supporting the plurality of sections between their respective open and closed positions. The flexible nature of the guide track, as well as the incorporation of a relatively quick release mechanism for retaining the guide track on the door's frame, allows for both minimization of damage to the door sections themselves and the time required to repair the door sections if they are accidentally damaged.Type: GrantFiled: May 23, 1975Date of Patent: April 12, 1977Assignee: United States Steel CorporationInventor: James N. Shepard
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Patent number: 3977123Abstract: An upwardly-acting door structure is adapted to close an access opening of a body member, such as an automobile-carrying railroad car. The door structure includes a stationary track on either side of the opening, movable tracks mounted for upward and downward movement along the stationary tracks, an upper panel mounted on the movable tracks, a lower panel mounted to move upwardly and downwardly along the movable tracks at twice the speed, flexible chains arranged to interconnect the lower panel with the movable tracks, torsional springs arranged to counterbalance and support the aggregate weight of the raised movable tracks, and handles operatively arranged to raise and lower the movable tracks. The upper and lower panels may be raised to uncover the access opening, or lowered to cover the access opening.Type: GrantFiled: June 25, 1975Date of Patent: August 31, 1976Assignee: Whiting Roll-Up Door Mfg. CorporationInventors: Roy T. Clay, Jr., Lauren C. Whiting