Patent ID: 6929165

Claim:
A pneumatic nail gun comprising: a body having a housing having an inner space and a bottom; a handle attached to the bottom of the housing and having an air chamber communicating with the inner space in the housing, a cavity with an inner surface and a connector for being connected to a high-pressure air source through a hose; and a nail firing device with a control valve mounted in the inner space in the housing for firing a nail; a nail magazine attached to bottom of the housing to receive and supply nails; an actuating device mounted between the housing and the handle to control the high-pressure air in the air chamber to flow into the inner space in the housing and having a channel defined in the handle, communicates with the air chamber and the inner space in the housing and having an inner surface; a piston rod moveably received in the channel, connected to the control valve of the nail firing device to operate the control valve and having a distal end extending into the cavity in the handle; an O-ring mounted around the piston rod to selectively abut against the inner surface of the channel; and a first spring mounted around the piston rod to provide a restitute force to the piston rod; a trigger assembly attached to the body and comprising an inner cap with an U-shaped cross section pivotally attached to the body and corresponding to the cavity in the handle; an outer cap slidably attached outside the inner cap; an actuating lever pivotally attached inside the inner cap, corresponding to distal end of the piston rod and having a distal end; and a second spring mounted between the actuating lever and the inner surface of the cavity to make the actuating lever separate from the distal end of the piston rod; and a push bar assembly moveably mounted in the housing of the body for moving the actuating lever of the trigger assembly when the push bar assembly abuts against an object.