Boring or penetrating the earth – Bit or bit element – Core forming type
Patent
1975-04-23
1977-01-11
Purser, Ernest R.
Boring or penetrating the earth
Bit or bit element
Core forming type
175320, 175398, 403343, 403372, E21B 912
Patent
active
040022145
ABSTRACT:
A boring tool, especially for drill hammers with a hollow drill core bit, which the inner thread of the hollow drill core bit connected directly to the borer shank and in which a corresponding outer thread provided on a holding mandrel form a part of the borer shank have a wire coil-thread insert inserted therebetween. The hollow drill core bit and the borer shank are provided with centering surfaces located between the windings of the wire coil thread insert and arranged in centering engagement with each other.
REFERENCES:
patent: 2152681 (1939-04-01), Caminez
patent: 2418418 (1947-04-01), Martin et al.
patent: 2816737 (1957-12-01), Kinard et al.
patent: 3062568 (1962-11-01), Andresen et al.
patent: 3690390 (1972-09-01), Chromy
Becker Walter
Favreau Richard E.
Hawera Probst Kommanditgesellschaft Harmetall-Werkzeugfabrik Rav
Purser Ernest R.
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