Oil well sucker rod shock absorber

An oil well sucker rod shock absorber comprising, in combination:

• an outer cylindrical casing defined by a cylindrical wall and having a removable upper plug means and lower plug means disposed respectively at upper and lower extremities of said casing, said upper plug means having an axial bore and said lower plug means defining a closed lower end and having an upwardly facing top surface;
• plunger rod means connected to said sucker rod and being slidably disposed in the bore of said upper plug means, a piston within said cylindrical casing and coupled to said plunger rod means and having a downwardly facing bottom surface;
• biasing means having a maximum vertical length disposed vertically within said casing and extending between said downwardly facing surface of said piston and said upwardly facing surface of said lower plug means at all times for allowing vertical reciprocal translation of said plunger rod means and said piston within said cylindrical casing downwardly against said biasing means;
• a plurality of apertures disposed through said cylindrical casing along the entire length thereof opposite the length of the biasing means, allowing downhole fluid pressure to be applied to said piston within said cylindrical casing via said apertures to be added to the force of the biasing means, without causing a fluid lock within the cylinder, whereby slap and wear of the sucker rod resulting therefrom are reduced and damage thereto prevented.