Patent ID: 7931181
Filing Date: 2011-04-26
Classification: B25C

Abstract:
1. A combustion-type power tool comprising a housing; a cylinder disposed in the housing and defining an axial direction; a piston slidably disposed in the cylinder and reciprocally movable in the axial direction; a head opposed to the piston; a combustion chamber frame movable in the axial direction, the combustion chamber frame being abuttable on the head to seal a combustion chamber defined by the combustion chamber frame in cooperation with the head and the piston; an ignition unit that ignites combustible gas injected into the combustion chamber; a trigger that is operated by a user for driving a fastener into a workpiece, the trigger movable in the axial direction; a lever having one end portion engageable with the combustion chamber frame and an other end portion located above the trigger, the lever being rotatable via engagement with the combustion chamber frame so that the other end portion moves between a first position and a second position which is closer than the first position from the trigger; and a restrain member disposed between the trigger and the housing and extending toward the other end portion of the lever, the restrain member being in contact with the other end portion to prevent the trigger from moving into contact with the other end portion of the lever when the trigger is depressed before the other end portion takes the second position.