Shock absorption apparatus associated with well pump

Claim 1

A well sucker rod shock absorber apparatus, the combination comprising (a) upper and lower generally horizontal members to pass the rod at a vertically axial location, (b) shock absorbing cushion means confined between the members, the cushion means defining an opening to pass the rod, the cushion means comprising flexible cushions located at transverse sides of said opening, (c) the upper member adapted to receive loading exerted downwardly by the rod,, (d) the lower member adapted to be supported and stroked up and down by a pump unit, (e) said cushions defining hollows containing gas, and which are vertically compressible against resistance imposed by said gas, each cushion having an annular outer wall which bulges outwardly, said bulging outer wall height occupying a substantial portion of the spacing defined between said upper and lower members, (f) guide rod means carried by one of said members and sleeve means carried by the other of said members to receive and guide said guide rod means, the guide rod means including two transversely spaced guide rods and the guide sleeve means including two transversely spaced guide sleeves, the rods confined in said opening between said cushions and at opposite sides of said vertically axially spaced location, (g) each said cushion comprising bellows having multiple, upper and lower annular convolutions, (h) and means interconnecting the cushions at opposite sides of said opening to intercommunicate the gas in said cushions at opposite sides of the opening, (i) said guide rods defining a plane intersecting all of the cushions, (j) whereby the cushions remain openly and peripherally unobstructed to access for adjustment or replacement.