A door having a door body that can be lifted, along a predetermined path, from a closed position in which it closes a wall opening into an open position in which it is located substantially overhead, the door body having two, three or more door body elements arranged one on top of the other in the closed position, is modified according to the invention in that a lower edge of the door body in the closed position and trailing during the lifting can be lifted separately, when the door reaches the open position, by a pivoting movement of a lower door body element having said edge in a lifting direction with respect to a door body element situated above it in the closed position relative to the predetermined path.

The present invention relates to a hydraulic door drive for a lifting door (1) that opens, in particular, vertically, comprising at least one hydraulic motor (6), adapted and configured to drive a door curtain (2) or to be at least concomitantly driven by the door curtain (2), at least one hydraulic unit (10) for supplying the hydraulic door drive (5) with pressurized hydraulic fluid (13; 13a), characterized by a pressure accumulator (22), wherein a) potential energy of the door curtain (2), which is released when the latter is closed, can be stored in the form of pressure energy in the pressure accumulator (22), and/or b) the pressure accumulator (22) can be loaded with pressure energy by means of the at least one hydraulic unit (10), wherein c) pressure energy stored in the pressure accumulator (22) can be discharged to the hydraulic motor (6) in order to at least open and/or at least close the door curtain (2).

A system is disclosed for converting an overhead door into a gate or serving window, the system having at least two rows of panels spanning the width of the door, one panel located above and adjacent to the other panel, a pair of rails opposite one another and adjacent to the panels, the panels traveling within the rails to move from a closed position to an open position, and at least one hinge connecting the lower row of panels to the upper row of panels, the hinge having an upper half attached to the upper row of panels and a lower half attached to the lower row of panels, the upper and lower halves of the hinge connected by a removable central pin, wherein the upper row of panels moves from the closed position to the open position when the central pin is removed from the hinge.

A hinge for movably attaching to parts together incudes: a first gear; a second gear; a cover configured to attach the first gear to the second gear; a first sliding surface on the cover; a second sliding surface on the cover wherein the first gear slides on the first sliding surface and the second gear slides on the second sliding surface when the hinge is operated; and an area on the first gear with no teeth and the area with no teeth is configured to slide past the second gear to allow the first gear to enter the cover. A method of assembling a hinge includes: moving a surface without gear teeth on a first gear past a toothed surface on a second gear; moving the first and second gears into a cover; meshing a tooth on the first gear with a tooth on the second gear; and holding the first and second gears together with the cover.

An improved vertical lift door roller assembly has a wheel pivotally mounted to a shaft. The shaft is placed within a spring loaded locking cylinder. The locking cylinder is movable between a first position where it restricts pivoting of the wheel and a second position where the wheel is able to pivot. When the door roller assembly is used on a vertical lift door, the wheel can be pivoted to decouple the roller from a vertical lift door J channel wheel track.

The present invention relates to a door operation system (1) for opening and closing an opening (2) comprising: a door frame (3) comprising a first frame section (4) at a first side (5) of the opening (2) and a second frame section (6) at a second side (7) of the opening (2); a door (8) arranged to be moved between a closed (C) and an open (0) position, the door (8) being movably connected to the door frame (3); a drive unit (10) mounted on the door (8), the drive unit (10) comprising at least one motor (11) arranged to move the door (8) from the closed (C) position to the open (0) position and vice versa, and an elongated transmission member (19) extending along at least one of the first side (5) and second side (7) of the opening (2), wherein the drive unit (10) further comprises a driven transmission member (18) in driving connection with the motor (11), the driven transmission member (18) being movably connected to the elongated transmission member (19) and arranged to interplay with said elongated transmission member (19) for driving the driven transmission member (18) along said elongated transmission member (19) by the elongated transmission member (19) at least partially wrapping around the driven transmission member (18), wherein at least one guide member (92) mounted to the door (8) is arranged to interplay with the elongated transmission member (19) for guiding the elongated transmission member (19) into contact with the driven transmission member (18), wherein the least one guide member (92) comprises a sliding surface (101) on which the elongated transmission member (19) is configured to slide, and wherein the sliding surface (101) has a curvature, which is configured to urge the elongated transmission member (19) to flex and follow the curvature.

An improved vertical lift door roller assembly has a wheel pivotally mounted to a shaft. The shaft is placed within a spring loaded locking cylinder. The locking cylinder is movable between a first position where it restricts pivoting of the wheel and a second position where the wheel is able to pivot. The door roller assembly is mountable to a support a vertical lift door, such as a bracket or a hinge. The roller wheel can be pivoted to decouple the roller from a vertical lift door wheel track and to reseat the wheel in the track.

A hinge includes: a first and second gear; a cover configured to attach the gears; a first outside surface associated with the first panel; a second outside surface associated with the second panel; wherein when the first and second outside surfaces are in a generally co-planer orientation, a tooth from one of the first and second gears fits next to a tooth from the other of the first and second gears to form a water shedding joint. A method of forming a hinge includes: extruding a gear together with a panel having a first outside surface; a second panel a second outside surface; wherein when the first and second outside surfaces are in a generally co-planer orientation, a tooth from one of the first and second gears fits next to a tooth from the other of the first and second gears to form a water shedding joint.

A roller with a plastic injection tube to coat the steel shaft wherein the plastic coated shaft eliminates the metal-to-metal contact that creates the noise. Closing the gap between the metal roller shaft and hinge barrel will eliminate the metal-to-metal contact resulting in a very quiet, rolling garage door. Further disclosed is an improved roller wheel having a tire made of material selected from the group consisting of urethane and urethane (PER) on which the roller will roll within a garage door track to significantly reduce the noise of the roller as it rolls inside the garage door tracks as the garage door is raised and lowered. The improved wheel include two plastic wheel sections with a gap therebetween with the tire made of urethane (PER) molded between the two sections and also extending through openings within the two wheel sections to retain the two wheel sections together.

In example a panel for an overhead sectional door is provided. The panel includes a laminate core, a laminate skin, and a universal fabric hinge. The laminate skin is coupled to two opposing sides of the laminate core. The universal fabric hinge is coupled to the laminate skin to connect the panel to an adjacent panel of the overhead sectional door.