Patent ID: 7575262

Claim:
A lift coupling for quick releasable engagement with juxtaposed first and second angularly extending walls of a dovetail socket comprising: a lock block having a first toe element adapted to wedgingly engage said first angularly extending wall of said dovetail socket, a lifting member receiving port, and a keyway passing angularly through said lock block; an axis extending through said lock block generally parallel to said keyway; a key member slidably received in said keyway, said key member having a second toe element adapted to wedgingly engage said second angularly extending wall, said key member being slidably received in said keyway, said key member being generally confined by said keyway to generally linear movement along said axis between full said wedging engagement and full disengagement configurations with said second angularly extending wall, said axis being adapted to extend generally parallel to said second angularly extending wall during said generally linear movement, said second toe element being generally opposedly disposed from said first toe element when engaged with said dovetail socket; and a retainer assembly adapted to slidably retain said key member in said keyway for said generally linear movement between said full engagement and disengagement.