A truck assembly includes a housing including an annular groove member in an underside; an axle bracket including an upper annular groove at an intermediate portion; a coil spring disposed in both the annular groove member and the upper annular groove and including a smaller first end fastened in the annular groove member, and a smaller second end fastened in the upper annular groove; a mounting pin; a first bearing; a second bearing; and a hollow spacer. The mounting pin is driven through the housing, the first bearing, the axle bracket, the second bearing, and the hollow spacer to be secured to a nut so that the axle bracket is configured to swivel to twist the coil spring, and in response to the twisting is stopped, the energized coil spring releases energy to turn the axle bracket to an inoperative position.

This invention relates to a mobile water sports court comprising a Net Module (3), a Line Module (2), and a Support Module (1). The Net Module (3) is positioned above the water surface and includes a Net Body (31), Upper and Lower Holder Cables (32, 33), and Sliding Hooks (34). The Line Module (2) is placed on the water surface and features Border Lines (20) with Marker-Holding Ropes (21) supporting cylindrical Boundary Markers (22), secured with Carabiners (23) and Corner Clips (24). The Support Module (1) includes Anchor Screws (11), Ground Screws (12), Guy Ropes (13a), Anchor Ropes (13b), Lower and Upper Support Pillars (14, 18), a Centerline (15) and Anchor Buoys (16), which connect the modules and secure the court. Additionally, a Pool Fixation Kit (10) with Threaded Anchor Plates (10a), Eye Bolts (10b), and Cushion Feet (10c, 10d) is provided for easy anchoring in pool environments, replacing traditional anchor methods. This modular structure offers stability, adaptability, and portability for water sports courts in both open water and pool settings.

A skateboard that is collapsible. There is a collapsible deck having a first end and a second end, the first end is supported and fixedly attached to one support body, the second end is supported and fixedly attached to an opposite support body. The deck is comprised of a plurality of individual slat units in a scissor lift configuration that allows for expansion and contraction of the deck in a linear direction.

Various embodiments for a panel that may be combined with other similar panels to form a padding layer of an athletic field, or other surface, are disclosed. The panel for use in a padding layer of a panel system includes at least one water accumulation region positioned at or near a perimeter of the panel. The at least one water accumulation region is defined by a pyramidal surface that slopes downwards from a center of the panel to distal edges of the panel such that the center has a height relative to a ground surface greater than the distal edges of the panel, a plurality of projections projecting from the pyramidal surface, and a ridge projecting from the pyramidal surface, the ridge extending along a perimeter of the panel, wherein the ridge has a projection height sufficient to retain water at the perimeter of the panel.