Raise drill with replaceable stem

Details Raise drill with replaceable stem Raise drill with replaceable stem

1975-07-07

1977-02-15

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175 53, 175320, 175364, 175375, E21B 908

Patent

active

040077993

ABSTRACT:
A raise type of earth boring drill in which the cutter assembly is detachably secured to the drive stem to permit replacement of the stem. The stem slidably engages a central opening in the cutter assembly, the cutter assembly engaging a shoulder on the stem which carries axial loads in the drill. The cutter assembly is detachably anchored by a plurality of bolts to a torque plate attached to the end of the stem for transmitting torque load to the cutter assembly, the bolts clamping the cutter assembly against the shoulder.

REFERENCES:
patent: 2090356 (1937-08-01), Reed
patent: 2239461 (1941-04-01), Mann
patent: 3092190 (1963-06-01), Guere
patent: 3384191 (1968-05-01), Schmacher, Jr. et al.
patent: 3675729 (1972-07-01), Neilson
patent: 3866698 (1975-02-01), Stanley
patent: 3902562 (1975-09-01), Pessier et al.
patent: 3917009 (1975-11-01), Dyer et al.
patent: 3920089 (1975-11-01), Mitchell

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