Patent ID: 8960516
Filing Date: 2015-02-24
Classification: B25B,B25C

Abstract:
1. A fastener driving tool comprising: a housing; a cylinder including a first cylinder fixed to the housing and a second cylinder fixed to the housing; a combustion chamber frame movable in the housing and defining a combustion chamber in cooperation with the cylinder; a first piston slidably reciprocally movable relative to the first cylinder and displaced upon expansion of air/fuel mixture in the combustion chamber; a second piston slidably reciprocally movable relative to the second cylinder and displaced upon expansion of air/fuel mixture in the combustion chamber; a bit extending from the first piston and having a base end portion supported to the first piston and rotatable about its axis, and having a free end portion engageable with a fastener, the bit being linearly movable in accordance with the movement of the first piston; a rod extending from the second piston and having a rack, the rod being linearly movable in accordance with the movement of the second piston; and a motion conversion mechanism having a first part engageable with the rack, and a second part engaged with the bit for converting the linear movement of the rod into a rotational movement of the bit.