Pneumatic percussion tool with relatively movable head valves

Details Pneumatic percussion tool with relatively movable head valves Pneumatic percussion tool with relatively movable head valves

1991-01-08

1992-02-04

Look, Edward K.

Motors: expansible chamber type

With motive fluid valve

With fluid pressure holding means for valve

91442, 91444, 91461, 91468, F15B 1108, F15B 1304

Patent

active

050851268

ABSTRACT:
A pneumatic percussion tool includes a head valve device including first and second head valves disposed in the body and movable in response to the pressure variation in the head valve chamber. The first and second head valves are positioned at a first position for preventing communication between the main air chamber and the percussion piston chamber while permitting communication between the percussion piston chamber and the outside of the body and preventing communication between the head valve chamber and the outside of the body when the compressed air is introduced into the head valve chamber through the change-over valve. The first and second head valves are movable from the first position to a second position for permitting communication between the main air chamber and the percussion piston chamber while preventing communication between the percussion piston chamber and the outside of the body and between the head valve chamber and the outside of the body when the compressed air has been discharged to the outside through the change-over valve. The first and second head valves are movable relative to each other for permitting communication between the head valve chamber and the outside of the body and for preventing communication between the percussion piston chamber and the outside of the body during the movement from the first position to the second position.

REFERENCES:
patent: 3056964 (1962-10-01), Beckman et al.
patent: 3313213 (1967-04-01), Wandel
patent: 3392632 (1968-07-01), Volkmann
patent: 3396636 (1968-08-01), Bade
patent: 3437013 (1969-04-01), Volkmann
patent: 4667572 (1987-05-01), Elliesen

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