Tool driving or impacting – Impacting devices – Impact transmitting anvil
Patent
1974-10-11
1976-01-20
Purser, Ernest R.
Tool driving or impacting
Impacting devices
Impact transmitting anvil
173 80, 285333, 403343, E21C 1502
Patent
active
039332101
ABSTRACT:
A drilling tool assembly comprising an elongated shank having an upper end for receiving driving forces, and having tapered threads at its lower end for engaging a drill head. The shank has first and second downwardly facing shoulders, with one of said shoulders being above the threads and the other shoulder being below the threads. A removable drill head has tapered threads for engaging corresponding shank threads along substantially the full length thereof. The drill head also has first and second upperwardly facing shoulders adapted to respectively bear against the first and second shoulders on the shank. The drill head shoulders are positioned such that they are still separated from the confronting shank shoulders by a gap when the threads of the two elements initially make up along the pitch line during their assembly. The gap optimally falls within the range of about 0.010-0.070 inch, whereby the threads will be slightly deformed as torque is applied to the drill head in order to bring the confronting shoulders into load-bearing contact with one another. The preferred threads are modified American Standard Acme screw threads having a pitch of about 0.5.
REFERENCES:
patent: 1326643 (1919-12-01), Burns
patent: 1477855 (1923-12-01), Thurston
patent: 1932427 (1933-10-01), Stone
McHugh Charles W.
Purser Ernest R.
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