System for loosening and tightening vehicle wheel nuts - has pad fitting between vehicle jack and wheel nut wrench with torque indicator lamp

摘要

The steel pad (2) fits on the head of the jack and slides vertically in the steel box (1). Between the pad and the box is a spring of predetermined stiffness. An electrical contact (5) closes when the spring is compressed to a predetermined extent, and completes the circuit between the 1.5 volt cell (6) and the indicator lamp (8). The box is cased in plastic. The pad (11) is mounted on trunnions above the box, and its top is formed to fit under the handle of the wheelnut wrench, which should be inclined at an angle fo 35 degrees or less to the horizontal. When tightening the wheel nut or bolt, the nut or bolt is pulled up ''hand tight'' before applying the system to the handle. The indicator light will illuminate when the correct torque is reached. The light is not applicable to the loosening process. ADVANTAGE - The wheel nuts or bolts are tightened to the correct torque, avoiding over= or under=tightening. Tightening and loosening are made easier.