Lights or other accessories can be mounted through a mount hole of an adapter plate which is pivotably supported upon a base. The base is attachable to an underlying structure, such as a motor vehicle, through bores passing through lateral wings thereof, or through bores in an angled flange thereof. The base includes a cylindrical body with an upper face. A central recess extends down into a center of the cylindrical body, located at a center of the upper face. The adapter plate includes a cylindrical extension which fits within the cylindrical recess. A series of holes surround the central recess in the upper face of the base. A set pin of the adapter plate is biased toward extending down from the adapter plate to reside within one of the holes in the upper face, to hold the adapter plate in one of multiple rotationally spaced positions.

A collapsible skateboard includes an upright handle having lower portion on which is fixedly mounted a bracket, a connector having a curved slot having a lower end formed with a horizontal recess, an upper end formed with a vertical recess, and a circular hole under the vertical recess, an adjust pin inserted into the vertical recess of the connector and the elongated hole of the bracket, a pivot pin fitted through the circular hole of the connector and the circular hole of the bracket, a spring having an upper end connected to the adjust pin and a lower end to the pivot pin, and a platform on which is fixedly mounted the connector, whereby the skateboard can be easily folded up as desired.

A collapsible skateboard includes an upright handle having lower portion on which is fixedly mounted a bracket, a connector having a curved slot having a lower end formed with a horizontal recess, an upper end formed with a vertical recess, and a circular hole under the vertical recess, an adjust pin inserted into the vertical recess of the connector and the elongated hole of the bracket, a pivot pin fitted through the circular hole of the connector and the circular hole of the bracket, a spring having an upper end connected to the adjust pin and a lower end to the pivot pin, and a platform on which is fixedly mounted the connector, whereby the skateboard can be easily folded up as desired.

A foldable locking mechanism (300,500) adapted for a frame body (400) includes a first mounting seat (1), a second mounting seat (2), a third mounting seat (4), a first locking component (3) and a driving component (1a,2a). The second mounting seat (2) is pivotally connected to the first mounting seat (1) and the third mounting seat (4). The first locking component (3) is at least partially disposed between the second mounting seat (2) and the third mounting seat (4) and movable between a first releasing position and a first locking position for allowing or restraining a relative pivotal movement of the second mounting seat (2) and the third mounting seat (4). The driving component (1a,2a) is disposed on the first mounting seat (1) and abuts against the first locking component (3). The driving component (1a,2a) is configured to drive the first locking component (3) to move to the first releasing position to allow a folding operation of the foldable locking mechanism (300,500) for allowing a folding operation of the frame body (400).

The present invention relates to an improved hinge assembly, and more particularly, which consists of a hinge rotation body and a hinge support body, so that the hinge rotation body and the hinge support body are easily rotated to each other by hinge rotation and, in addition, the hinge rotation body and the hinge support body are easily returned to their original positions by an operation to push any one of the hinge rotation body and the hinge support body after hinge rotation to thus significantly improve convenience as well as usability. Further, since the above components are locked or unlocked based on the left and right seesaw movement due to displacement of center of gravity of the locking member, a simple configuration may be adopted to greatly improve productivity as well as assembly efficiency and reduce production cost.