Patent ID: 7594550

Claim:
A pneumatic hand tool consisting essentially of: a body having a space defined in a front portion thereof, an air inlet positioned in the space and a closed rear end of the body provided with a control knob mounting portion; a cylinder assembly, which is composed of a cylinder, a rotor and a front cover; wherein, the cylinder is further composed of a receiving chamber, an inlet opening, a rear inlet passage and a bottom inlet opening; the rear inlet passage is corresponded to the control knob mounting portion of the body, and the bottom inlet opening is communicated with the air inlet which is situated in the space of the body; a rotor receiving chamber is defined to receive therein the rotor, and a front cover is mounted on the front opening of the cylinder; the rotor has a front shaft provided with a first coupling portion, and the cylinder assembly is received in the space of the body; a control knob, which is composed of an air plug and an adjustment knob, wherein the air plug is extended through the control knob mounting portion of the closed rear end as well as the rear inlet passage of the cylinder, and extended out of the inlet opening of the cylinder; the adjustment knob is coupled with the control knob mounting portion of the closed rear end, and the end of the air plug is also coupled with the adjustment knob tightly; a striking assembly has a central axle extending from a first side thereof and a second coupling portion extending a second side thereof opposite to the first side to couple with the first coupling portion of the front shaft; and a front cap, which is covered to the front opening of body having a through hole which allows the central axle of the striking assembly to extend therethrough.