Pneumatic Nail Gun Capable of Striking Nails in Automatic Mode

摘要

A pneumatic nail gun operated in automatic actuation mode includes a gun body, a trigger valve, and a shuttle valve. The gun body defines therein a main chamber and is provided with a forward air conduit and a return air conduit. The forward air conduit provides a path for the pressurized air in the main chamber to force a valve stem of the shuttle valve to conduct a forward movement for a drive stroke. The return air conduit provides a path for the pressurized air in the cylinder to force the valve stem to conduct a return movement after the nail gun has completed the drive stroke. By depressing an actuating bar of the trigger valve a single time, the valve stem can be forced to conduct repeated forward and return movements, and thus the nail gun can conduct repeated drive strokes for stably striking a nail.

主权项

1. A pneumatic nail gun, which comprises:
a gun body provided therein with a cylinder and a poppet valve on top of the cylinder, the gun body defining therein a main chamber that is supplied with pressurized air and defining therein a top chamber over the poppet valve, wherein a piston together with a drive blade is slidably fitted in the cylinder; a trigger valve, mounted to the gun body and communicated with the top chamber via a trigger passage composed of a first segment and a second segment, for regulating the pressurized air in the main chamber to enter the top chamber via the trigger passage and regulating the pressurized air in the top chamber to be released to atmosphere via the trigger passage; a shuttle valve mounted to the gun body, the shuttle valve including a substantially cylindrical, movable valve stem; and a forward air conduit and a return air conduit provided in the gun body for guiding the pressurized air in the main chamber to flow into the shuttle valve to cause forward and return movement of the valve stem of the shuttle valve for regulating the pressurized air in the main chamber to enter the top chamber via the trigger passage, so that the drive blade can be forced to conduct repeated drive strokes for striking a nail in automatic actuation mode; wherein the return air conduit is communicated with at least one return port defined at the cylinder; when the pneumatic nail gun conducts a drive stroke, the piston will pass by the return port and the drive blade will move from a top position to a bottom position.