Fluid Actuated Tool Having Removable Coil Spring Biasing Means

Author:  W. M. Cameron, T. Mikiya, M. Matsumura
Source:  US Patent 3,680,643
Doc ID:  1970044
Year of Publication:  1970
Abstract:  
A fluid actuated tool which utilizes a tubular sleeve that is formed independently of the internal tool elements. The tool includes a tubular sleeve, a cylinder mounted within said sleeve, a space between the sleeve and the the cylinder being provided which is used as an air-passage, a piston inserted in the cylinder which reciprocates by the pressure imposed by incoming air from the air-passage, a receiving piece provided at the forward end of the sleeve, the receiving piece having a hammer, a needle chisel or other workpiece attached thereto and being moved in correspondence with the movements of the piston. A coil spring, projection or a removable cap element, biases the piston and receiving piece rearward.