Box and ratchet wheel arrangement for wrench

摘要

A box and ratchet wheel arrangement includes a wrench body with a box at one end, a ratchet wheel mounted in the box and adapted to hold the workpiece in a serrated center coupling hole thereof, a stop block mounted in the box and forced by a spring member to engage the ratchet wheel and to control the direction of rotation of the ratchet wheel, and a retainer ring of resilient metal mounted in an outside annular groove of the ratchet wheel, the retainer ring having a plurality of protruded retaining portions inserted through respective radially extended through hole of the ratchet wheel and adapted to hold down the workpiece in the serrated center coupling hole of the ratchet wheel.