Roller bit seal excluded from cuttings by air discharge

Details Roller bit seal excluded from cuttings by air discharge Roller bit seal excluded from cuttings by air discharge

1978-04-03

1980-01-15

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175372, 308 82, E21C 1300, E21B 910

Patent

active

041834178

ABSTRACT:
A rotary roller bit for drilling earth and rock formations, having a main body and three legs extending outwardly therefrom. Each of the legs carries a conical roller cutter with internal bearings and there is a seal around the periphery of the top of the roller cutter. The periphery of the roller cutter is spaced from the adjacent portion of the leg so as to provide a jet slot for the discharge of air. Adjacent the slot and radially inwardly is an air chamber which is formed between an annular surface of the leg and a seal ring. The air chamber is substantially greater in its dimension axially of the roller cutter and air is supplied to it under sufficient pressure to cause a jet of air to flow from the jet slot at a sufficient rate to prevent the entry of rock particles and dirt into the roller cutter.

REFERENCES:
patent: 1945240 (1934-01-01), Tupica
patent: 2814464 (1957-11-01), Pike et al.
patent: 3921735 (1975-11-01), Dysart
patent: 4102419 (1978-07-01), Klima

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