Shock limiting apparatus

Details Shock limiting apparatus Shock limiting apparatus

1979-01-29

1980-09-23

Novosad, Stephen J.

Boring or penetrating the earth

With signaling, indicating, testing or measuring

175 50, 175321, 175 45, 267125, 267137, E21B 1702, E21B 4700, F16F 918

Patent

active

042237467

ABSTRACT:
In accordance with an illustrative embodiment of the present invention, a shock limiting apparatus for mounting an instrumentality in a drill collar comprises piston and cylinder means subject to hydrostatic well fluid pressure for preventing longitudinal movement of the instrumentality within the drill collar unless a predetermined level of deceleration is exceeded, and a combination of hydraulic damping and Coulomb friction means for dissipating kinetic energy of the instrumentality in a substantially uniform manner when applied deceleration exceeds said predetermined level.

REFERENCES:
patent: 2812717 (1957-11-01), Brown
patent: 3149490 (1964-09-01), Clements et al.
patent: 3225566 (1965-12-01), Leathers
patent: 3606297 (1971-09-01), Webb
patent: 3714831 (1973-02-01), Quichaud et al.
patent: 3963228 (1976-06-01), Karle
patent: 4055338 (1977-10-01), Dyer
patent: 4133516 (1979-01-01), Jurgens
patent: 4145034 (1979-03-01), Dyer

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