Percussion tool

Claim 1

A percussive tool which includes a rigid body portion having a central piston chamber with a piston, said piston connected through a first central bore to a piston rod, and a percussive chamber into which the piston rod extends, a second central bore extending from said percussive chamber to one end of said rigid body to support the shank of a chisel that is mounted to abut with said piston rod, said piston chamber being connected at the top and at the bottom to an air line, said air line provided with a reversing valve that is automatically actuated with the full movement of the piston to direct a flow of compressed air supplied to said percussive tool to provide a rhythmic oscillation of said piston, said piston rod abutting and driving said chisel downward for the full stroke of said piston, said chisel connected to a spring at about its center, said spring held in a stationary-supported position by a cagelike structure that is affixed to the lower end of said rigid body, said spring absorbing the shock of the downward stroke of the chisel and with its compression providing the power to return said chisel to position the end of the chisel in the percussion chamber for the next cycle of movement of the driving piston rod, a hand operated valve and a handle for holding and controlling the operation of said tool and an exhaust line connected to said piston chamber to empty the area above or below said piston when said piston completes its stroke upward and downward.