Hydraulic shock absorber

Details Hydraulic shock absorber Hydraulic shock absorber

E - Fixed Constructions

21

B

255/28, 267/79

E21B 17/00 (2006.01) E21B 17/07 (2006.01)

Patent

CA 1056364

ABSTRACT An hydraulic shock absorber for protecting the drill bit and drill pipe in rotary earth drilling consists of a casing with an upper sub mounted in its one end for connection to a string of drill pipe. An anvil is slidably mounted on the other end. A plurality of hollow pistons are slidably mounted inside the casing. The pistons each have a hollow sleeve portion extending in sealing relationship through seating rings mounted on the inside of said casing. The pistons also have a radial flange portion at their upper end slidably sealing with the walls of the casing and a fluid passage extends through the wall of the casing between the flange portion and the seating ring.

283618

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