Hydraulic shock absorber

Details Hydraulic shock absorber Hydraulic shock absorber

1976-10-04

1978-01-10

Purser, Ernest R.

Boring or penetrating the earth

With tool shaft detail

Axially telescoping shaft section

175 65, E21B 1700

Patent

active

040674053

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.

REFERENCES:
patent: 2661928 (1953-12-01), Topanelian, Jr.
patent: 2851251 (1958-09-01), Mori
patent: 2901221 (1959-08-01), Whittle
patent: 2937007 (1960-05-01), Whittle
patent: 2946314 (1960-07-01), Nast
patent: 3834472 (1974-09-01), Perkins

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