Tongs for safe lifting of inclined pipe - has lifting linkage pivoted about jaws in direction of pipe axis to avoid bending moments

摘要

The tongs are used in conjunction with a crane or hoist. The lifting linkage (21) consists of an outer member (24) and inner member (23) sliding relative to each other. At the bottom of the inner member is a beam (15) which rests on the pipe (3) to be lifted and has a cross-pin (17,19) about which the linkage can pivot. On a cross-bar (5) of the beam are pivoted jaws (5) which close to grip the pipe when the linkage is pulled upwards, causing the curved plate (29) welded to the outer member to force the top ends (7) of the jaws apart. The curved plate remains in contact with the jaws to maintain grip even when the pipe is steeply inclined. ADVANTAGE - Simple design ensuring safe handling of inclined pipe. Jaws and linkage and relieved of bending moments.