Cutting tool for a pneumatic hammer

Details Cutting tool for a pneumatic hammer Cutting tool for a pneumatic hammer

1979-03-22

1980-12-30

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Nonsymmetrical bit

175417, E21B 902

Patent

active

042418003

ABSTRACT:
A cutting tool for a pneumatic hammer operative at the bottom of a hole comprising a head for supporting cutting bits and a tail of reduced diameter extending from the head and provided with grooves forming alternating asymmetrical teeth engageable in symmetrical grooves provided in the interior of the front cylinder of the hammer. Each tooth of the cutting tool has a working flank in contact with the hammer during drilling which is of greater height than the other flank of the tooth so that each asymmetrical tooth can define in the symmetrical groove of the hammer an escape channel for compressed air from the hammer.

REFERENCES:
patent: 1660201 (1928-02-01), Lee
patent: 3986565 (1976-10-01), Aktinson
patent: 3991834 (1976-11-01), Cunington
patent: 4079793 (1978-03-01), Mosely et al.

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