An opening/closing structure of a cover includes a casing and a rotatable cover. A shaft part and a bearing part are formed to one and the other of the casing and the cover, respectively. One of the shaft part and the bearing part is formed with one of a protrusion and a relief part on a part of an end surface in an axial direction, and the other of the shaft part and the bearing part is formed with the other of the protrusion and the relief part on a facing surface facing the end surface. The protrusion circumvents contact with the surface having the relief part when the cover is closed. When the cover is opened, from the closed state, by a particular angle, the protrusion contacts the surface so as to be applied with a resistant force against rotation of the cover.

Provided is a clamp for clamping to sheet material, such as tarps. The clamp includes first and second clamping members each having a gripping portion that clamp the sheet material between one another in a clamped position. The first and second clamping members are held in the clamped position by an interaction between radial locking teeth on a deflectable release lever of one of the clamp members and a tooth in a slot of the other clamping member.

An opening/closing structure of a cover includes a casing and a rotatable cover. A shaft part and a bearing part are formed to one and the other of the casing and the cover, respectively. One of the shaft part and the bearing part is formed with one of a protrusion and a relief part on a part of an end surface in an axial direction, and the other of the shaft part and the bearing part is formed with the other of the protrusion and the relief part on a facing surface facing the end surface. The protrusion circumvents contact with the surface having the relief part when the cover is closed. When the cover is opened, from the closed state, by a particular angle, the protrusion contacts the surface so as to be applied with a resistant force against rotation of the cover.

A hinge assembly includes first and second portions. One of the first and second portions includes first and second receptacles and the other one of the first and second portions includes first and second cylindrical members extending in opposite directions along a hinge axis and a thickened portion having a contoured outer surface disposed adjacent the cylindrical members. The second portion is moveable from: a first state wherein the first and second cylindrical members are disposed in the first and second receptacles such that the second portion is coupled to the first portion and generally free to rotate about the hinge axis through at least a predetermined degree range, and a second state in which the second portion is decoupled from the first portion responsive to the second portion being rotated beyond the predetermined degree range and the contoured outer surface interacting with a portion of the first portion.

Provided is a clamp for clamping to sheet material, such as tarps. The clamp includes first and second clamping members each having a gripping portion that clamp the sheet material between one another in a clamped position. The first and second clamping members are held in the clamped position by an interaction between radial locking teeth on a deflectable release lever of one of the clamp members and a tooth in a slot of the other clamping member.

A hinge assembly includes a first portion having first and second receptacles and a second portion having first and second cylindrical members extending in opposite directions along a hinge axis and a thickened portion having a contoured outer surface disposed adjacent the cylindrical members. The second portion is moveable from: a first state wherein the first and second cylindrical members are disposed in the first and second receptacles such that the second portion is coupled to the first portion and generally free to rotate about the hinge axis through at least a predetermined degree range, and a second state in which the second portion is decoupled from the first portion responsive to the second portion being rotated beyond the predetermined degree range and the contoured outer surface interacting with a portion of the first portion.

An opening/closing structure of a cover includes a casing and a rotatable cover. A shaft part and a bearing part are formed to one and the other of the casing and the cover, respectively. One of the shaft part and the bearing part is formed with one of a protrusion and a relief part on a part of an end surface in an axial direction, and the other of the shaft part and the bearing part is formed with the other of the protrusion and the relief part on a facing surface facing the end surface. The protrusion circumvents contact with the surface having the relief part when the cover is closed. When the cover is opened, from the closed state, by a particular angle, the protrusion contacts the surface so as to be applied with a resistant force against rotation of the cover.

A maintenance window locking device includes a maintenance window body (1), a maintenance window cover (2), a fastening plate (3), a first limiting mechanism (1a) including a groove, and a roller (3a). The fastening plate (3) includes a fastening plate body and a pin (3c) which are of an integrated structure. The pin (3c) is rotatably connected to the roller (3a). The maintenance window body (1) is hinged to a first end of the maintenance window cover (2). The fastening plate body is rotatably connected to a second end of the maintenance window cover (2). The first limiting mechanism (1a) is located on the maintenance window body (1). The fastening plate body drives the maintenance window cover (2) to move toward the maintenance window body (1). The roller (3a) rolls along the first limiting mechanism (1a) until the roller is clamped into the groove, such that the maintenance window cover (2) and the maintenance window body (1) are tightly attached.

A timer assembly housing is configured to include a number of features, including but not limited to a tortuous sealing lip, adjustable hinge assembly, removable backing plate, removable pin hinge, toggle switch, and a wiring lid. The timer assembly includes a weatherproof housing having a base with a series of sidewalls and a rear wall, the base sidewalls extending forward from the rear wall to an open front, a lid having a series of sidewalls and a front wall, the lid sidewalls extending forward from the front wall, and a timer assembly positioned within the base. The lid is selectively pivotably secured to the base along one of the base sidewalls.

A clamp assembly is disclosed which includes a first clamp half-piece and a second clamp half-piece. In one example, the clamp half-pieces are identically shaped. In one example, each of the clamp half-pieces has at least one integral pin and at least one aperture. The first and second clamp half-pieces are pivotally connected to each other via a first snap-fit interface in which the integral pin of the first clamp half-piece snap-fits into the at least one aperture of the second clamp half-piece. The clamp assembly can also include a link arm connected to the first clamp half-piece via a second snap-fit interface. A lever arm can also be included that is pivotally connected to the link arm via a third snap-fit interface. The clamp assembly does not require separate link pins or other parts and only includes four components: the clamp half-pieces, the link arm, and the lever arm.