Annular air-hammer apparatus for drilling holes

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

E - Fixed Constructions

21

B

255/41

E21B 21/12 (2006.01) E21B 4/14 (2006.01)

Patent

CA 1260458

ANNULAR AIR-HAMMER APPARATUS FOR DRILLING HOLES Abstract of the Disclosure The annular air-hammer apparatus for drilling holes comprises a shell fitted co-axially wherein are a chips-receiving sleeve, a hollow cylindrical case, and a ring-shaped hammer capable of reciprocat- ing back and forth. The lower part of the shell ac- commodates 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.

514971

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