Patent ID: 6875186

Claim:
A percussive device comprising: a) a housing having a piston chamber and a valve chamber; b) a piston that slides in a reciprocating motion in the piston chamber; c) a floating valve that slides in a reciprocating motion in the valve chamber, the floating valve connected to the piston; d) an inlet port in the housing; e) an exhaust port in the housing; f) a channel connecting the inlet port and the exhaust port; and g) a source of pressurized gas in connection with the inlet port; such that when the piston is depressed, the floating valve and piston cooperate to cause the reciprocating motion and wherein: h) the piston is a solid first cylinder having an annular piston ring of smaller diameter than the first cylinder; i) a piston o-ring is seated in the annular piston ring such that a substantially air-tight seal is formed between the piston o-ring and the piston chamber; j) the floating valve is a valve assembly comprising: i. a solid second cylinder having a first, second, third, fourth and fifth annular valve ring, each valve ring having a smaller diameter than the second cylinder; and ii. a first, second, third, fourth, and fifth valve o-ring seated in each of the annular rings, such that a substantially air-tight seal is formed between the valve o-rings and the valve chamber respectively; and such that the valve o-rings create a first, second, third, and fourth compartments in the valve chamber; such that when the piston is retracted, the fourth compartment blocks fluid communication between the inlet port and the exhaust port and when the piston is extended the second compartment is in fluid communication with the exhaust port.