US Patent 8375880 Retractable step for boat swim platform

A retractable step for use with a boat in water comprising at least one moveable arm pivotally coupled with the boat, a step coupled with the arm such that the step is moveable between a stored position above the water surface and a deployed position below the water surface, and a lock configured to hold the moveable arm in a stationary position when the step is in its deployed position, but is releasable to accommodate movement of the step to its stored position.