PNEUMATIC HAND-OPERATED IMPACT TOOL FOR GRAPH WORKS Russian patent published in 2017 - IPC B25D9/04 B44B3/00 

FIELD: machine engineering.

SUBSTANCE: tool has a cylindrical body with a circular partition on the inner surface of the body and through holes for air passage. The body accommodates a two-stage piston with longitudinal and radial channels dividing the body into three chambers. An anvil-tool holder with a chisel opening is fixed on one end of the cylindrical body, and on the other end a plug in the form of a cup and a handle. The handle is fixed on a connecting bushing. The handle has a union for air supply, and connected to a needle valve in the form of a conical needle with a rod and a spring and a valve body with cavity for air supply from the union. The needle valve is installed in a slot in the center of the handle. The conical needle with the rod and spring is forced into the end plug. The valve body has an annular radial groove with through hole for air supply from the union into its cavity. The connecting bushing is installed to form a gap between the connecting bushing and the cylindrical body. A gap for air passage is formed between the end plug and the handle inner surface.

EFFECT: expanded tool functionality.

7 cl, 3 dwg