| 摘要 |
<p>A powder-actuated piston-type fastener driving tool having a tilting muzzle bushing (74) to engage the fastener driving face (56) of the piston (52). …<??>After the piston (52) has been driven, the muzzle bushing (74) is displaced manually forwardly, by means of a slide (64), until the muzzle bushing (74) tilts to a position where it can contact the fastener driving face (56) of the piston (52). The muzzle bushing (74) is then returned breechwardly, pushing the piston (52) in front of it back into the barrel bore (36) to a driving position. When the a driving position of the piston (52) is reached, the muzzle bushing (74) comes out of the tilted position into a position where it is coaxial with the piston (52).</p> |
