A door tensioning system for an oven or other appliance includes a chain and spring assembled as a pull member attached at one end to a door and at an opposite end to a base member of the appliance in a manner maintaining spring-mediated tension between the door and the base/bulk of the appliance. The pull member is routed around a bracket-assembly-mounted pulley, where the bracket assembly includes at least one movable bracket member that is movable with the pulley in a manner that will increase or decrease tension in the pull member by increasing/decreasing its effective length between its ends.

A negator spring tool for winding a negator spring output drum around a rotational axis includes: a pair of tool handles; and a tool disk having an outer edge which is generally circular except for a cutout. The tool disk is configured to be releasably attached to the output drum. The tool disk has a drum-facing side which includes protruding teeth protruding from the drum-facing side to engage radial spokes of the output drum. The outer edge of the tool disk includes handle slots which are spaced circumferentially. The distal end of each tool handle is insertable into a handle slot to rotate the tool disk around the rotational axis. The protruding teeth of the tool disk each having a T-shaped cross section, each T-shaped protruding tooth and the drum-facing side forming an I-shaped cross section having two opposite facing cavities on two opposite sides of the I-shaped cross section.

A window assembly may include a pane movable between open and closed positions, a cam having a cam surface, and a cam follower coupled to the movable pane for movement relative to the cam surface and engageable with the cam surface when the movable pane is near or in the closed position. The cam surface may be inclined toward a seal to direct the movable pane into the seal when the movable pane moves into the closed position. The cam surface may include a linear portion that extends along at least a majority of the path of travel of the movable pane. The cam follower may remain engaged with the cam surface throughout a desired portion of the path of travel of the movable pane.

A latch assembly connected to the drive unit of a bi-fold door for retaining the bi-fold door secure to a building has elongated straps attached to rotatable latch drums mounted on the outer ends of the drive shaft of the drive unit. Lift drums powered by a motor driven gearbox raise and lower the bi-fold door. Latch assemblies having springs attached to the straps maintain tension on the straps during the opening and closing of the bi-fold door.

A moving coil, constant force, curl spring window balance assembly for installation in a hung window assembly comprising a sash. The window balance assembly can include a carrier, a mounting bracket, a curl spring and a sash support bracket. The sash support bracket can be positioned intermediate the carrier and the mounting bracket. The sash support bracket can selectively engage at least one of the carrier or the mounting bracket. The sash support bracket is operable to supplement the holding force provided by the curl spring of the window balance assembly against the weight of the sash when the sash is in a raised position.

An anti-derailment system is described for a wheel which can roll on a track and is pivoted on a carriage which translatably supports a leaf of a piece of furniture. The system has a slider which is inseparably mountable or mounted on the track and is able to translate on the track independently of the carriage, and a constraint element for constraining the slider and at least one of the wheel, the carriage or the leaf to each other, so as to keep the wheel in condition of rolling on the track without derailing.

A plug (1) for use with a counterbalancing system (3) of a cable-operated door (5). The plug (1) includes flange and collar portions (13,15), the flange portion (13) being connectable to a mounting component (7) of the counterbalancing system (3) in order to allow a torque transfer from a torsion spring (9) to the mounting component (7), and the collar portion (15) being configured for winding into a given end (17) of the torsion spring (9), the collar portion (15) having opposite first and second extremities (19,21), and an outer surface (23) extending between these extremities (19,21), the outer surface (23) of the collar portion (15) being provided with a plurality of threads (25) and a plurality of corresponding recesses (27) each being defined between a pair of adjacent threads (25), each recess (27) being configured for receiving therein a single coil segment (11a) of the torsion spring (9), and being further shaped and sized for preventing another coil segment (11b) of the torsion spring (9) from embarking onto said recess (27).

To keep the same size motor when panel numbers are varied, the invention includes a torsion spring counter balancing mechanism for a stacking panel shutter door, wherein one end of the or each torsion spring is fixable to a drive transmission shaft of the stacking panel shutter door, the drive transmission shaft being adapted to raise and lower the or each shutter of the stacking panel shutter door; and the other end of the or each torsion spring is fixable to a separate rotatable member of the stacking panel shutter door; and whereby the mechanism is provided with means adapted to enable both the drive transmission shaft and the rotatable member to rotate, during opening and closing of the stacking panel shutter door, in such a manner as to cause respective ends of the or each torsion spring to travel at different speeds during the opening and closing sequence.

A balance shoe for a block and tackle window balance system includes an enlarged head portion housing a locking system configured to receive at least a portion of a pivot bar and releasably engage a jamb track. An elongate tail portion configured to couple at least partially within a U-shaped channel of the window balance system. A front face, the front face of the elongate tail portion being adjacent to a base wall of the U-shaped channel when the elongate tail portion is coupled therein. The front face including an elongate channel configured to allow passage of the pivot bar from the elongate tail portion towards the locking system. The balance shoe also including at least one protrusion extending from the front face of the elongate tail portion and disposed at least partially within the elongate channel.

A door opening and closing device includes: a resin-made base attached to an inner panel of a door; and a transfer mechanism provided on an interior side of the base, and transferring power to a locking device via a power transfer cable, wherein the base includes first and second parts in which the transfer mechanism and the cable are disposed respectively, and a fixing portion fixing an outer casing end portion of the cable, and wherein the first and second parts are configured to locate at different levels so that the second part is positioned closer to an inner side than the first part in a width direction, a step portion is provided between the first and second parts, and the fixing portion is provided in the step portion.