A twist-lock clamp to attach a solar module to a rail system includes a spring between a top clamp and a t-nut, with features on the spring and top clamp to restrict rotation relative to each other. The t-nut includes features allowing rotation of about 90 degrees when the t-nut is inserted in a rail, but restrict rotation beyond about 90 degrees. The spring serves to hold the top clamp and t-nut apart while allowing the twist-lock clamp to resist sliding in the rail during installation.

An assembled structure includes multiple first assembling units, each of the first assembling units comprising main body parts and connection parts, wherein the main body parts have a profile shape of a polygon having 6n equal-length sides, wherein n is a positive integer; and the connection parts are provided on each equal-length side of each main body part; and the connection parts on each equal-length side are connected to each neighboring first assembling unit by a sliding pair, and the sliding direction of the sliding pair is the same as the extension direction of the sliding pair on the equal-length side on which the sliding pair resides.

A splicing metal plate includes at least one pair of an elongated first and second connecting plate, the elongated first connecting plate having a side edge that extends downwardly vertically with an accommodating portion having an opening, the elongated second connecting plate having a side edge that extends downwardly vertically with an embedded portion, and the accommodating portion of the first connecting plate is embedded within the embedded portion of the second connecting plate. A front-end cover connected to a front-end of the first and second connecting plates along a length direction. A rear-end cover connected to a rear-end of the first and second connecting plates along the length direction. A supporting portion for the front-end and rear-end covers disposed at bottom portions of the first and second connecting plates.

A sandwich panel includes a reinforcement member having a recess formed to extend in a longitudinal direction over a predetermined length and open laterally. The thermoplastic resin core material has a rectangular flat board-like shape, and includes a protrusion which is disposed on a peripheral side surface portion thereof and which is capable of being laterally press-fit with respect to the recess. The protrusion has opposing surfaces respectively opposing mutually opposed inner surfaces of the recess, the opposing surfaces being oriented so as to protrude from the peripheral side surface portion. At least one of the opposing surfaces is provided with a plurality of protuberances disposed at an interval in the longitudinal direction. Each of the protuberances has a predetermined height from the opposing surfaces enabling the protuberances to tightly contact the inner surfaces of the recess at the time of press-fitting.

A splicing metal plate has an elongated first connecting plate and an elongated second connecting plate, the edge of the first connecting plate is extended downwardly vertically with an accommodating portion with an opening, the edge of the second connecting plate extends downward vertically with an embedded portion, the accommodating portion and the embedded portion contact each other, the embedded portion is inserted into the accommodating portion; further comprising a front end cover and a rear end cover, the front end cover is connected to the front end of the first connecting plate and the second connecting plate, the rear end cover is connected to the rear end of the first connecting plate and the second connecting plate, the front end cover, the rear end cover, the first connecting plate and the second connecting plate surrounds and defines a groove structure with the bottom portion opening.

A clamp connector includes a first clamping member configured to apply a clamping force to a material, the first clamping member having a first portion including a first and second cam surfaces, a first cammed body adjacent the first cam surface, and a second cammed body adjacent the second cam surface. A second clamping member is configured to apply a clamping force to the material. The second clamping member having a second portion including a third and fourth cam surfaces, a third cammed body adjacent the third cam surface, and a fourth cammed body adjacent the fourth cam surface. When each cam surface is forced against the adjacent cammed body a clamping force between the first clamping member and the second clamping member is increased.

A twist-lock clamp to attach a solar module to a rail system includes a spring between a top clamp and a t-nut, with features on the spring and top clamp to restrict rotation relative to each other. The t-nut includes features allowing rotation of about 90 degrees when the t-nut is inserted in a rail, but restrict rotation beyond about 90 degrees. The spring serves to hold the top clamp and t-nut apart while allowing the twist-lock clamp to resist sliding in the rail during installation.

A twist-lock clamp to attach a solar module to a rail system includes a spring between a top clamp and a t-nut, with features on the spring and top clamp to restrict rotation relative to each other. The t-nut includes features allowing rotation of about 90 degrees when the t-nut is inserted in a rail, but restrict rotation beyond about 90 degrees. The spring serves to hold the top clamp and t-nut apart while allowing the twist-lock clamp to resist sliding in the rail during installation.

The hooking device (16) for panels (15) of pieces of furniture comprises a base body (17) fixable to a covering panel (15) of the piece of furniture and at least one engagement element (18) connected to the base body (17) and hookable to a support element (11) of a piece of furniture; said at least one engagement element (18) is movable with respect to the base body (17), and drive means (19) are provided for moving said at least one engagement element (18) during an assembling step of the panel (15) on the piece of furniture.

A fastening tool to mount a plate-shaped photovoltaic module to a mounting target object, includes: a support member arranged on the mounting target object and including a pair of vertical wall portions and a pair of mounting portions formed at upper ends of the vertical wall portions and mounting the photovoltaic module thereon; a pressing member arranged between the pair of vertical wall portions and including a base portion fastened to the mounting target object by a fastening member via the support member, and a regulating portion provided at the base portion and regulating movement of the photovoltaic module in a direction away from the mounting target object; and a pair of claws deforming by an external force and formed at the vertical wall portions, tilted with respect to the vertical wall portions, and having a distance between tips smaller than a width of the base portion.