| 摘要 |
A longitudinal housing includes a bore for slidably receiving a barrel assembly having a bore coaxially aligned with the housing bore. A cartridge receiving chamber is positioned within the barrel assembly, and a firing mechanism actuated by a trigger assembly fires the cartridge. The explosion forwardly propels a piston member positioned within the barrel assembly to strike an anvil end portion of a chase. The chase is retained within the bore of a tool holder that is secured to and movable with the barrel assembly. The chase includes a plurality of marker elements for impressing a mark upon the surface of an object. A pair of safety pawls are pivotally connected to the tool holder within the bore thereof and are arranged to contact a sleeve member surrounding the barrel assembly adjacent the forward end portion of the housing to prevent cocking of the firing mechanism unless marker elements are retained within the chase of the tool holder and the elements are depressed against an object to be marked.
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