Air groove scraper

Details Air groove scraper Air groove scraper

1983-11-28

1985-05-07

Leppink, James A.

Boring or penetrating the earth

With mechanical cleaner for bit or cutter element

175339, E21B 1206

Patent

active

045152284

ABSTRACT:
An earth boring rock bit having a sealed bearing with air or gas as the circulating medium. An annular groove is formed in the vicinity of the seal and connected to the interior of the bit for cooling the seal and cleaning debris from the area of the seal. An air groove scraper is mounted on the shaft in the exit port of the annular groove to prevent the annular groove from becoming plugged by debris mixing with moisture in the hole.

REFERENCES:
patent: 2769616 (1956-11-01), Morlan et al.
patent: 2960313 (1960-11-01), Goodwin
patent: 3013621 (1961-12-01), Kinnear
patent: 3921735 (1975-11-01), Dysart
patent: 4096917 (1978-06-01), Harris
patent: 4156470 (1979-05-01), Bodine et al.
patent: 4183417 (1980-01-01), Levefelt
patent: 4287957 (1981-09-01), Evans
patent: 4375242 (1983-03-01), Galle

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