Patent ID: 7918373

Claim:
A combustion type power tool comprising: a housing including a canister housing in which a gas canister accumulating a gas is provided; a push lever supported to the housing; a combustion chamber frame disposed in the housing and movable in accordance with a movement of the push lever; a drive mechanism provided in the housing for driving the pas canister to inject the gas when the combustion chamber frame is moved to a predetermined position; and a prohibiting mechanism disposed at the housing and selectively providing a prohibiting position to prevent the combustion chamber frame from moving past the predetermined position and a non-prohibiting position to allow the combustion chamber frame to move past the predetermined position; wherein the push lever is movable in a first direction toward a workpiece and a second direction opposite to the first direction, the combustion type power tool further comprising: a chamber head forming therein a gas injection passage, the gas canister being in selective fluid communication with the gas injection passage; a cylinder disposed in the housing and below the chamber head and extending in a longitudinal direction of the housing; a piston slidably movably disposed in the cylinder, a combustion chamber being defined in combination with the combustion chamber frame, the chamber head, the cylinder and the piston when the combustion chamber frame is seated on the chamber head through the movement of the combustion chamber in the second direction; and a coupling member that connects the push lever to the combustion chamber frame for moving the combustion chamber frame to a position in abutment with the chamber head in interlocking relation to the movement of the push lever into the housing; wherein the prohibiting mechanism has a stop position in the prohibiting position to prevent the coupling member from moving in the second direction, and has a release position in the non-prohibiting position to allow the coupling member to move in the second direction.