Shock absorbing and shock force generating apparatus with...

Details Shock absorbing and shock force generating apparatus with... Shock absorbing and shock force generating apparatus with...

2005-06-14

2005-06-14

Butler, Douglas C. (Department: 3683)

Spring devices

Fluid

Expansible-contractible chamber device

C175S321000, C267S137000, C188S371000

Reexamination Certificate

active

06905114

ABSTRACT:
A shock absorbing apparatus and method includes a shaft travelling north and south within a tube. The tube is positioned south of a sucker rod. The shaft has a piston head coupled at a south end thereof, which piston head is received in an area of reduced diameter with the shaft. North pores and south pores permit the movement of fluid into and out of the interior of the tube, in response to the northward/southward movement of the piston head. Fluid entering through the pores provides a shock absorbing effect on both the upstroke and the downstroke. The shock absorbing effect on the upstroke can be rapidly eliminated and an upward shock force generated, through the shearing of a shear pin that maintains a bushing in position on the shaft, restricting northward travel of the piston head.

REFERENCES:
patent: 2953352 (1960-09-01), Webb
patent: 4997037 (1991-03-01), Coston
patent: 6481987 (2002-11-01), Ford

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