A hinge structure including a plurality of pivots, a driving part, two positioning gear sets, and a plurality of fixing parts is provided. The pivots are parallel to each other. The driving part is disposed at a central portion of the pivots and is perpendicular to the pivots. These two positioning gear sets are respectively sleeved around two ends of each of the pivots. The fixing parts are respectively disposed outside these two positioning gear sets. When the plurality of fixing parts is under the action of an external force, the two gear sets are moved relative to each other, and the driving part is adapted to be bent and drives the pivots to rotate synchronously with respect to a central axis.

A lid stay for furniture includes a setting arm pivotably attached on a base element around a first setting axis between an open position and a closed position, and an energy accumulator coupled to the setting arm. The setting arm is acted upon by a force along at least a part of the pivot path of the setting arm between the open position and/or closed position and the energy accumulator includes a flat spring which is made from a plate-like flat material and the flat spring is elastically supported against the base element and the setting arm in a plate plane of the flat material.

In the roof window, each hinge of (1010) of the set of hinges comprises a frame hinge part (1030), a sash hinge part (1040), and a movement supporting assembly comprising guiding means including a linkage mechanism with at least two links (1050, 1060) providing connection between the sash hinge part and the frame hinge part. The links (1050, 1060) of the linkage mechanism are connected to each other in a bearing axle (1055). One or more joints between the links and the frame and sash hinge parts comprises a sliding joint (1056, 1062) cooperating with a guide track (1036, 1045) and another joint may be a sliding joint or a hinged joint (1051, 1061). One or both of the guide tracks (1036, 1045) may comprise a curved portion.

In one embodiment, a system, comprising: a damper assembly, the damper assembly comprising: a structural member; at least one door pivotably coupled to the structural member; a clip connected to the damper assembly and comprising plural spring end constraining segments; a spring comprising a first end and a second end, wherein at least the first end comprises a hook, the spring coupled at the first end to one of the plural spring end constraining segments and at the second end fixably coupled to the damper assembly, the clip configured to accept a hookable connection to the spring at any one of the plural spring end constraining segments, each of the plural spring end constraining segments constraining movement of the hook, when connected thereto, during opening and closing of the at least one door, wherein the spring is at a first tension when hooked to the one of the plural spring end constraining segments and at a second tension when hooked to another of the plural spring end constraining segments.

An access door may include a core, first and second stiles defined along opposites sides of the core such that the core between the first and second stiles defines a recessed pocket with each of the first and second stiles defining a channel therein extending longitudinally along an inwardly-facing edge thereof, bottom and top elongated panels each defining tongue members at opposite sides thereof and configured to be received transversely in the recessed pocket with the tongue members received within the channels defined along the inwardly-facing edges of the first and second stiles, wherein, with the top and bottom elongated panels received in the recessed pocket, exterior faces of the first and second stiles, exterior faces of the top and bottom elongated panels, and an exposed surface of the recessed pocket between the top and bottom elongated panels define an exterior surface of one side of the door.

The invention relates to a retracting device for a leaf of a door or a window, comprising a housing, a piston which is arranged in a receiving area of the housing and which is urged by a spring, and a shaft which is mounted in the housing and which interacts with the piston, an actuating arm for the leaf being arranged on the shaft in a non-rotatable manner. At least one first driving element is arranged on the shaft, the head surface of said driving element forming a freewheel device with a freewheel region, wherein an arrangement of the piston or a tooth of a toothing of the piston slides on the freewheeling region so as to decouple the shaft from the piston.

Hinge (10) includes first case (11) having an insertion hole through which a first hinge shaft (17) is inserted and a guide groove guiding first link shaft (23), second case (12) having a first insertion hole and a second insertion hole through which second hinge shaft (19) and third hinge shaft (21) are respectively inserted and a guide groove guiding second link shaft (25), and a link mechanism that maintains intervals between first hinge shaft (17), second link shaft (25) and center shaft (27), intervals between second hinge shaft (19), first link shaft (23), and center shaft (27), and intervals between third hinge shaft (21), first link shaft (23), and center shaft (27), and a first member and a second member are supported with first case (11) and second case (12) respectively such that the first member and the second member are rotatable about a virtual rotation axis.

A cover is fitted to an aperture in an enclosure. A biasing mechanism is connected to the cover to mechanically bias the cover in an open position. An adhesive member is disposed around the aperture to retain the cover in a closed position against the bias of the biasing mechanism. A release mechanism effects release of the cover from the adhesive member by diminishing adhesion thereof in response to an open command signal.

A cover is fitted to an aperture in an enclosure. A biasing mechanism is connected to the cover to mechanically bias the cover in an open position. An adhesive member is disposed around the aperture to retain the cover in a closed position against the bias of the biasing mechanism. A release mechanism effects release of the cover from the adhesive member by diminishing adhesion thereof in response to an open command signal.