Title:
HYDRAULIC IMPACT ABSORBER
Document Type and Number:
Japanese Patent JPS5345601
Kind Code:
A
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.
Inventors:
GUREE BEEJINGAA
Application Number:
JP11796177A
Publication Date:
April 24, 1978
Filing Date:
October 03, 1977
Export Citation:
Assignee:
BASSINGER TOOLS INC
International Classes:
E21B17/07; F16F9/00; E21B4/14; (IPC1-7): E21B1/06; F16F9/00