Annular air-hammer apparatus for drilling holes

Details Annular air-hammer apparatus for drilling holes Annular air-hammer apparatus for drilling holes

1986-08-05

1988-02-02

Novosad, Stephen J.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

173 73, 173 78, E21B 2100, E21B 100

Patent

active

047224037

ABSTRACT:
The annular air-hammer apparatus for drilling holes comprises a shell hav fitted co-axially therein a chips-receiving sleeve, a hollow cylindrical case, and a ring-shaped hammer capable of reciprocating back and forth. The lower part of the shell accommodates a rock-cutting tool capable of moving axially with at least one blow-off passage formed by at least a single longitudinal groove made on the outer cylindrical surface of the rock-cutting tool. With the rock-cutting tool in its uppermost position, the blow-off passage communicates with an outlet space provided between the shell and the case.

REFERENCES:
patent: 3051134 (1962-08-01), Lincoln
patent: 3164214 (1965-01-01), Oelke
patent: 3524511 (1970-08-01), Klemm
patent: 3854539 (1974-12-01), Sweeney
patent: 3958645 (1976-05-01), Curington
patent: 3986565 (1976-10-01), Atkinson
patent: 4079793 (1978-03-01), Mosely et al.

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