Pneumatic percussive device

Details Pneumatic percussive device Pneumatic percussive device

1989-05-22

1990-10-23

Neuder, William P.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

173 91, 175297, E21B 414

Patent

active

049644777

ABSTRACT:
A pneumatic percussive device has a casing (1) accomodating a movable hammer piston dividing the interior space of the casing (1) into two chambers. One of these chambers (7) alternately communicates, by means of an air distribution arrangement (3) having a movable actuator member (8), with a compressed air source and with the environment. In addition, said chamber (7) communicates, via a throttling passage (27), with a cavity (10) of the air distribution arrangement (3) the pressure in which ensures movement of the actuator member to one of its limit positions.

REFERENCES:
patent: 3137483 (1964-06-01), Zinkiewicz
patent: 3431984 (1969-03-01), Buehler et al.
patent: 4250972 (1981-02-01), Schmidt
patent: 4690225 (1987-09-01), Tupitsyn et al.

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