Drilling shock sub

Details Drilling shock sub Drilling shock sub

1978-01-31

1979-11-06

Myhre, Charles J.

Boring or penetrating the earth

Below-ground impact members

With releasable means to detachably retain telescoping...

175321, 188268, 188269, F16D 306, F16F 930, F16F 906

Patent

active

041731301

ABSTRACT:
A drill string protecting axial shock absorbing sub which is relatively short and rugged and comprises inner and outer telescopically intersplined tubular elements forming therebetween an annular shock absorbing cushion confining piston chamber which is filled with a tightly packed suspension of 3/8" polyurethane pellets in a highly heat resistant lubricant such as "Mobil #1 Synthesized Engine Lubricant".

REFERENCES:
patent: 2240519 (1941-05-01), Reed
patent: 2678806 (1954-05-01), Brown
patent: 3285596 (1966-11-01), Burgert
patent: 3323327 (1967-06-01), Leathers
patent: 3353613 (1967-11-01), Harrison
patent: 3383126 (1968-05-01), Salvatori
patent: 3424448 (1969-01-01), Ma
patent: 3504936 (1970-04-01), Brown
patent: 3660990 (1972-05-01), Zerb

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