Patent ID: 8166852

Claim:
A ratchet wrench having a handle having a front end; a rear end; an external surface; and an air-inlet controlling device mounted in the handle to control the flow direction of a compressed air; a transmitting device connected to the handle and having a barrel connected to the handle and having a front end; a rear end connected to the front end of the handle; an internal surface; an external surface; a front threaded segment formed on the external surface of the barrel near the front end; a rear threaded segment formed on the external surface of the barrel near the rear end; and multiple elongated holes radially formed through the barrel at intervals between the threaded segments; a transmitting seat mounted in the barrel near the rear end and connected to the air-inlet controlling device of the handle; and a transmitting shaft rotatably mounted in the barrel, connected to the transmitting seat and having a rear end; a front end; a driving disk formed around the transmitting shaft near the rear end and facing to the transmitting seat; and an eccentric rod eccentrically formed on and protruding from the front end of the transmitting shaft; a torque adjusting device connected to the transmitting device and having a casing connected to the barrel of the transmitting device and having an internal surface; a front end; a rear end; a middle; an inner thread formed on the internal surface of the casing near the middle and screwed with the rear threaded segment of the barrel; and a holding recess formed in the internal surface of the casing near the front end and facing to the elongated holes of the barrel; a limiting assembly mounted around the transmitting shaft and having two pressing rings movably mounted around the transmitting shaft, one of the pressing rings abutting with the balls of the transmitting seat and the other pressing ring mounted on the transmitting shaft near the elongated holes of the barrel; and a push bearing movably mounted around the transmitting shaft near the holding recess of the casing and having an external surface; multiple mounting recesses radially formed in the external surface of the push bearing at intervals and aligning respectively with the elongated holes of the barrel; and multiple holding pins respectively mounted in the mounting recesses of the push bearing, extending out of the elongated holes of the barrel and pressed against the internal surface of the casing near the holding recess; and a spring mounted around the transmitting shaft and pressed against the pressing rings to push the holding pins abutting with the internal surface of the casing near the holding recess; and a ratchet head connected to the transmitting device and having a rear end connected to the front end of the barrel; and a front end.