Automatic sequential dual action sealing system

Details Automatic sequential dual action sealing system Automatic sequential dual action sealing system

1975-12-29

1977-06-28

Scott, Samuel

Boring or penetrating the earth

Below-ground impact members

With releasable means to detachably retain telescoping...

175321, 285351, 277 9, 277 53, E21B 1700

Patent

active

040317161

ABSTRACT:
A shock absorbing subassembly with a body, a mandrel slidably and non-rotatively received in the body, dampening means therebetween, an upper seal above the dampening means and a floating seal therebelow for maintaining an oil bath between the body and the mandrel, a primary seal between the body and the mandrel below the floating seal, and a secondary seal actuated upon a predetermined magnitude of leakage past the primary seal to sequentially establish another seal between the body and the mandrel above the primary seal and below the floating seal.

REFERENCES:
patent: 2996131 (1961-08-01), Greenwood
patent: 3406537 (1968-12-01), Falkner Jr.
patent: 3504936 (1970-04-01), Brown et al.
patent: 3588124 (1971-06-01), Guiard
patent: 3776558 (1973-12-01), Maurer et al.
patent: 3949150 (1976-04-01), Mason

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