Title:
【発明の名称】ショックアブソーバーを備えたガイド式掘削装置
Document Type and Number:
Japanese Patent JP2908378
Kind Code:
B2
Abstract:
There is provided a guided drilling system and an in-the-hole shock absorber adapted therein. The guided drilling system includes a drill string configured to continuously and accurately bore a hole into the ground without the need to periodically break the connection of the drill string. In order to protect the components of the drilling system a hollow core shock absorber for percussive drill strings has been designed. A centrally disposed coil spring (32) transmits the necessary thrust to a percussive hammer while providing a resilient cushion for vibration displacement. Pressurized fluid flows through a tube (72) passing along the center of the shock absorber through a poppet valve (54). The shock absorber has male and female spline members (44, 60) that transmit torque to the drill bit while allowing the shock absorber to be compressed to absorb shocks.
Inventors:
GUREGORII AARU BAIDEN
DONARUDO DEII YANGU
RAANBAATASU EICHI BAN BAAKERU
DEIBITSUDO ERU FUUBAA
HOORU DEBURUGUTO
DONARUDO DEII YANGU
RAANBAATASU EICHI BAN BAAKERU
DEIBITSUDO ERU FUUBAA
HOORU DEBURUGUTO
Application Number:
JP11294797A
Publication Date:
June 21, 1999
Filing Date:
April 30, 1997
Export Citation:
Assignee:
INKO LTD
International Classes:
E21B1/36; E21B1/00; E21B3/00; E21B4/14; E21B6/02; E21B7/02; E21B15/00; E21B17/07; E21B19/22; E21B19/24; F16F7/00; (IPC1-7): E21B4/14; E21C1/12; F16F7/00
Attorney, Agent or Firm:
Kazuo Sato (3 others)