A block and bolt connector comprises a block having an aperture with a lower opening and an upper opening which is smaller than the lower opening. The aperture extends through the block from the lower opening to the upper opening, and has a first portion and a second portion. A bolt has a head portion which passes through the lower opening but not the upper opening, and a shaft which may pass through the lower opening and the upper opening. The head portion of the bolt is received within aperture of the block and the shaft extends at least partially outside of the block beyond the upper opening. The first and second portions of the aperture are configured so as to permit selected movement of the bolt within the aperture relative to the block.

An arrangement (20) comprising a first part (21), a second part (22), and an adjustment device (23). The adjustment device (23) includes at least one adjustment unit (24) having a one first sleeve (25) extending in a respective adjustment direction (R) that is connected with the first part (21). At a free sleeve end (27) of the first sleeve (25) an abutment surface (28) is provided. The first sleeve (25) is arranged in a part cavity (26) of the first part (21) and includes a clearance (34) extending in circumferential direction between the first part (21) and the first sleeve (25). Adjacent to the clearance (34) at least one support part (35) is supported at the first part (21) radially to the adjustment direction (R). An adjustment screw (36) can apply a force to the first sleeve (25) to lengthen or compress it in the respective adjustment direction (R).

A mounting system for mounting an element to a surface includes a mounting post having a base configured for mounting to a surface. The mounting post is threaded on an outer surface. A mounting plate is configured for being secured to the element to be mounted and has a center opening for receiving the mounting post so that the mounting plate is freely movable along the mounting post. An adjustment plate includes a threaded opening to receive the mounting post. The adjustment plate is configured to incrementally rotate on the threaded mounting post for adjusting the position of the adjustment plate along the mounting post and with respect to the surface. The adjustment plate is configured for being fixed to the mounting plate at a plurality of incremental positions of the adjustment plate to secure the mounting plate at a selected position along the mounting post and thereby adjust the distance between the surface and mounted element.

A mounting system for mounting an element to a surface includes a mounting element having a base and a threaded shaft extending from the base along an axis. The base is configured for mounting to a surface. An incremental nut rotates on the threaded shaft and moves up and down on the shaft. A fitting is coupled with the incremental nut and the fitting is further configured for coupling with an element to mount the element to a surface at a selected height above the surface. Apertures are formed in the incremental nut and fitting and the apertures of the incremental nut aperture and fitting are aligned at a plurality of rotational positions of the incremental nut along the threaded shaft for adjusting the height of the nut and fitting. In one embodiment the threaded shaft includes an aperture that is aligned with the incremental nut apertures for locking the nut at a selected height.

An apparatus to expand and collapse planar board provided. The apparatus includes two planar boards and provides resistance to expansion and collapse.

A supporting foot assembly includes a base having a spherical convex, a disk connected to the spherical convex, a through hole, and an internal space; a swingably fitting member having a spherical concave swingably and fittingly contacting the spherical convex of the base, a lower edge located at a lower periphery of the spherical concave, an aperture, and an upper outer edge; a prop component having a bolt passing through the through hole and the aperture, a retaining portion integrated to or combined with the bolt and located in the internal space of the base so as to prevent the bolt from completely departing from the through hole of the base; and a nut screwed to the bolt of the prop component to abut against the upper outer edge of the swingably fitting member. Alternatively, the nut is integratedly formed on the swingably fitting member.

A fastener comprises a body part, fastening means for fixing the fastener to a first object, a mounting part for mounting a second object to the fastener, and connecting means connecting the body part and the mounting part. The mounting part is rotatable and pivotable relative to the body part so as to assume a predetermined orientation relative to the body part, and the body part is retractable from the mounting part. The fastener is adjustable between at least two operational states, a first operational state, in which the body part and the mounting part are adjacent to each other, or a second operational state, in which the body part is retracted from the mounting part so that the body part and the mounting part are spaced apart from each other. In the first operational state, the predetermined orientation of the mounting part relative to the body part is fixed, and in the second operational state, the predetermined orientation of the mounting part relative to the body part is adjustable by rotating and/or pivoting the mounting part.

An apparatus to expand and collapse planar board provided. The apparatus includes two planar boards and provides resistance to expansion and collapse.

An apparatus includes a mounting component with an opposed exterior surface configured to adapt to a curvature of a helmet via an attachment portion and angularly defined guide rails and friction slots. A cradle includes an exterior portion configured to receive an accessory and friction receiving coupler to integrate said cradle to said mounting component whereby cradle will travel non-linearly along the angularly defined guiderails of the mounting component. Friction inducing elements increase friction between the mounting component and the cradle where the friction is induced by mechanical elements, where the mechanical elements are adjustable by hand power.

A mounting system for mounting an element to a surface includes a mounting post having a base configured for mounting to a surface. The mounting post is threaded on an outer surface. A mounting plate is configured for being secured to the element to be mounted and has a center opening for receiving the mounting post so that the mounting plate is freely movable along the mounting post. An adjustment plate includes a threaded opening to receive the mounting post. The adjustment plate is configured to incrementally rotate on the threaded mounting post for adjusting the position of the adjustment plate along the mounting post and with respect to the surface. The adjustment plate is configured for being fixed to the mounting plate at a plurality of incremental positions of the adjustment plate to secure the mounting plate at a selected position along the mounting post and thereby adjust the distance between the surface and mounted element.