Patent ID: 7458278

Claim:
A torsion detecting mechanism for a pneumatic tool, comprising: a driving device including a rotating member, the pneumatic tool being rotatably inserted in one end of the rotating member, the other end of the rotating member having a drive portion with an arc-shaped height difference, one end of a driven member being formed with a driven portion opposite to the drive portion, the driven portion having an arc-shaped height difference corresponding to the drive portion, the driven member being moved axially without rotating, the other end of the driven member being formed with a pushing portion, and a restoration member, both ends of the restoration member being fixed to the rotating member and the driven member, respectively; a buffer device including a buffer containing member for containing the pushing portion, the pushing portion being used to push a medium disposed between the pushing portion and an abutting member of the buffer containing member, the abutting member being formed with a pushed portion and an abutting portion, the pushed portion being pushed by the medium; a sensing member disposed close to the abutting portion of the abutting member of the buffer device; a pressure relieving device including a return pipe, one end of the return pipe being connected to the medium of the buffer containing member of the buffer device, and the other end of the return pipe being connected to a pressure relieving valve body.