Down the hole hammer equipment

Details Down the hole hammer equipment Down the hole hammer equipment

1990-06-18

1992-01-14

Yost, Frank T.

Tool driving or impacting

Drive controlled by relative axial movement of tool

Drive motor controlled

173 73, 173 78, 173 80, B25D 1700, E21B 100

Patent

active

050801791

ABSTRACT:
The invention is concerned with pneumatic percussion drilling equipment with advantageous manufacturing simplicity and effective piston area to casing size consisting essentially of an elongate hollow casing housing a piston assembly and having a backhead at one end with a compressed fluid inlet, a bit assembly with a compressed fluid exhaust at the other end, and the backhead including a seal for a backhead end of the piston reciprocatable within the casing, the piston having axial bores extending inwardly from each end, inclined passages extending away from the inner ends of the axial bores to open through the wall of the piston at positions axially displaced from each other and towards opposite ends of the piston from their respective axial bores, and the casing walls having axially spaced apart recesses, the backhead seal, casing recesses and opening through the wall of the piston being such as to allow fluid under pressure introduced axially into the casing through the backhead, to reciprocate and to maintain a constant pressure on the piston in an inoperative position remote from the backhead.

REFERENCES:
patent: 2958645 (1976-05-01), Curington
patent: 4084647 (1978-04-01), Lister
patent: 4530408 (1985-07-01), Toutant
patent: 4591004 (1986-05-01), Gien
patent: 4753302 (1988-06-01), Gien et al.
patent: 4936393 (1990-06-01), Lister

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