Open head foster-style back-up tong

摘要

An open-head Foster style backup tong has a number of pivoting jaws in mesh with a ring gear. A gap in the ring gear admits tubing into the center of the ring gear, where the tubing is gripped by the jaws when the ring gear is turned. The tong housing is open sided for convenient access and maintenance, and the removable jaws are indexed for easy installation.