Patent ID: 6905114

Claim:
A shock absorbing apparatus for use in a pumping apparatus comprising, in combination: a tube having a north interior region and a south interior region and adapted to be coupled within a pumping system south of a sucker rod; wherein said north interior region has a greater diameter than at least a portion of said south interior region; north pores located in said tube and permitting a flow of fluid into and out of an interior of said tube; south pores located in said tube and permitting a flow of fluid into and out of said interior of said tube; a shaft located within said tube and capable of north and south movements relative to said tube; a piston head coupled proximate a south end of said shaft; wherein said piston head is adapted to enter said south interior region; wherein said piston head is adapted to travel north of said south pores so as to permit fluid to alternately enter and exit through said south pores during pumping operations; and a bushing coupled to said shaft north of said piston head; wherein said bushing is coupled to said shaft via a shear pin that passes through a shear pin opening in said shaft and wherein said shear pin is coupled at ends thereof to said bushing.