Hydraulic rotary-percussive hammer drill

Details Hydraulic rotary-percussive hammer drill Hydraulic rotary-percussive hammer drill

2007-06-26

2007-06-26

Gay, Jennifer H. (Department: 3672)

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

C175S293000, C173S103000, C173S212000

Reexamination Certificate

active

10504055

ABSTRACT:
A hydraulic rotary percussive hammer drill includes a body containing a reciprocating percussion piston sliding under the effect of a main hydraulic supply circuit, this main circuit also being intended to cause the sliding of a roughly annular abutment piston housed in a cavity of the body, and having, on the one hand, a front face in contact with a shank and intended to place this shank a predetermined distance away from the percussion piston and, on the other hand, a rear face facing a rear wall of the cavity, characterized in that an external hydraulic supply circuit is able, when the main circuit is shut down, to introduce fluid under pressure between the rear face of the abutment piston and the rear wall of the cavity so as to maintain a space between these items.

REFERENCES:
patent: 5479996 (1996-01-01), Jonsson et al.
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patent: WO 0201041 (2002-01-01), None

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