Bolt driving tool acting via an intermediate anvil

摘要

The apparatus has a feeder (2) moving in a canon (3) between firing and fixing positions. Brake ball bearings (6) for the feeder and lever arms (7) are pivoted on a guide plug. The arms are arranged to modulate radial action of the ball bearings based on relative movement of the canon and feeder between a maximum force when the feeder advances the canon and a minimum force when the feeder backs up.