Patent ID: 7273113

Claim:
A reversible penetrating machine with a pneumatically controlled differential air distributing mechanism, comprising: a tubular housing assembly, including a tube that has a sharpened chisel rigidly installed into its front part and a front valve chest installed into its rear part, a protective sleeve attached to said front valve chest and said tube, and structurally shaped longitudinal directional stabilizers rigidly attached to the lateral surface of said tube and said protective sleeve, creating longitudinal air channels between the internal surfaces of said stabilizers and outer surfaces of said tube and said protective sleeve; a striker assembly reciprocating inside of said tube, creating a forward stroke chamber in the space between its rear part and the front part of said front valve chest, a backward stroke chamber in the space between its front part and the rear part of said chisel, and cyclically imparting impacts to the rear part of said chisel during the forward mode of operation and to the front part of said front valve chest during the reverse mode of operation, including a striker, a pair of bushings rigidly installed on both ends of said striker, and means for keeping said bushings in place; a pneumatically controlled differential air distributing mechanism installed in the rear part of said tube, controlling the air flow causing reciprocating motion of said striker assembly such that during the forward stroke of said striker assembly, when said forward stroke chamber is pressurized, said backward stroke chamber is open to the atmosphere, while when said backward stroke chamber is pressurized causing said striker assembly to perform the backward stroke, said forward stroke chamber is open to the atmosphere, including said front valve chest accommodating a double stepped stroke control valve that is permanently pneumatically controlled during said machine operation, a rear valve chest carrying a pair of hose barbs with hoses for the nominal (high) air pressure line and reduced (low) air pressure line, a stepped relief valve, that is permanently pneumatically controlled during said machine operation, reciprocating inside of said rear valve chest, which is aligned by a stepped adapter, having air ducts, with said front valve chest and rigidly attached to it by a group of bolts.