Patent ID: 7708177

Claim:
A powder-actuated fastener-driving tool comprising: a housing having a front open end and a rear end opposite to each other in an axis; a barrel unit inserted movably into said housing through said front open end and having a rear end portion that is disposed in said housing and that defines a chamber adapted for accommodating gunpowder therein; a holder disposed movably in said housing, abutting against said rear end portion of said barrel unit, and having a through hole defined by an inner annular surface that has an inwardly extending shoulder portion; and a spring-loaded firing pin disposed in said housing and between said rear end of said housing and said holder, and having a free end portion that extends into said through hole in said holder, said firing pin being movable among a normal position, a standby position and a firing position, wherein when said firing pin is disposed in the normal position, said firing pin is inclined relative to the axis so that said free end portion of said firing pin engages said shoulder portion of said inner annular surface of said holder and is spaced apart from the gunpowder, when said firing pin is moved from the normal position to the standby position, an assembly of said barrel unit, said holder and said firing pin is moved toward said rear end of said housing, and when said firing pin is moved from the standby position to the firing position, said free end portion of said firing pin disengages said shoulder portion of said inner annular surface of said holder to move along the axis toward said rear end portion of said barrel unit to thereby contact and ignite the gunpowder in said chamber in said rear end portion of said barrel unit; and a trigger unit mounted on said housing and operable so as to enable said firing pin to switch from the standby position to the firing position.