HAMMER STRIKABLE POWDER-ACTUATED FASTENER DRIVING TOOL: SHOCK ABSORBTION FOR INNER BREECH BLOCK TRAVELLING REARWARDLY IN OUTER TUBULAR BODY

摘要

In a hammer-strikable, powder-actuated, fastener-driving tool, a breech block is mounted within a generally tubular body by several resilient shock absorber structures, each including an elastomeric grommet, an eyelet having a tubular portion surrounded by the grommet and an annular portion, a washer interposed between the annular portion and one end of the grommet, and a screw attaching the breech block to the body. The screw shank extends through the grommet. The screw head bears against the washer. The breech block mounts a firing pin, which is biased backwardly to a normal position, and to which a hammer-strikable button is connected. A barrel, mounted upon the body so as to be axially movable with respect thereto, has an elongate slot. A stud mounted upon the body extends through the slot. A washer disposed around the stud is biased against the barrel so as to impart frictional drag to the barrel.