Patent ID: 8556313

Claim:
A retractable grappling hook which comprises: a central shaft elongated along a first axis; a plurality of tines; each of said tines being rotatively connected by a pin to a peripheral area of the shaft and including a short proximal lever portion having an end surface and an outer lateral surface on one side of the pin and an elongated grappling portion on an opposite side of the pin; each of said tines being individually pivotable from a deployed position oblique to the shaft to a folded position substantially parallel to the shaft; and an axially movable head adjustable between a tine-unlocking configuration and a tine-locking configuration; wherein the head bears against the axial end surface of a tine in said folded position and against the outer lateral surface of a tine in said deployed position; and, wherein the head has a tine-contacting undersurface machined to coincidentally rest against the end surface of a folded tine and the outer lateral surface of a deployed tine when the head is adjusted to the locking position; wherein said undersurface has a arcuately concave circular area having a radius of concavity centered about the pin.