| 摘要 |
A base plate with a ring of holes is secured to any existing sports board. A flat rotatable plate, supporting a board boot binding, has a two-position spring-loaded locking shaft which locks down in one of the holes to secure the boot binding at a desired stationary angle and alternately locks up out of the holes for free rotation. A semicircular arc in one plate dividable into two smaller arcs by a movable stop limits rotation of a safety pin from the other plate alternately to one or the other of the smaller arcs. A downwardly extending ridge around the periphery of the rotatable plate overlaps the base plate. There is a low friction surface between the two plates, an inner grease ring to keep dirt out of the inner shaft, a leash hole and leash on the L-shaped locking mechanism to aid in it's operation, and a rotatable position indicator that aids the user in locating their desired angular position, an elevated lock ring to prevent icing or water buildup in the locking holes, and a series of holes in the base plate that allow the user to preset the amount of desired rotation between the plates.
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