Traveling block elevator latch assembly

Abstract

Apparatus for supporting a length of pipe to accommodate pipe stabbing and removal operations during launching or recovery of the length of pipe is disclosed. The apparatus is designed for use with a hoist rig of the type having a mast structure secured to a support platform, a traveling block, and power means including a sheave and cable assembly supported by the mast structure which are operatively connected to raise and lower the traveling block. A detachable elevator block is provided for supporting the length of pipe in a make up position at a stabbing station on the support platform. Latching means are carried by the traveling block for releasably coupling the elevator block to the traveling block during pipe running and recovery operations. In a preferred embodiment, the latching means are mounted for reciprocal and pivotal movement within a latching chamber of the traveling block. Extensible linear actuating means interconnect the traveling block and the latching means for effecting movement of the latching means within the latching chamber between an extended coupling position and a retracted released position. The latching means are guided by wall portions of the latching chamber and are radially displaced to permit positive engagement or disengagement of the latching means with the elevator block in response to reciprocal movement of the latching means between the retracted position and the extended position, respectively.