Tightening tool for coupling ring of pipe couplings has tightening chain ends connected by crossbar and tightening block held by steel screw in moveable bearing

摘要

The tool has a chain around the coupling ring, a crossbar (30) connecting the chain ends, and a tightening block (36). This is connected to the crossbar via a screw (34), which is held in a moveable bearing (42), e.g. a spherical disc bearing. The crossbar has a thread insert (32) of a harder material, e.g. brass or bronze, than the screw, which is of steel.