Title:
【発明の名称】流体作動衝撃さく岩装置
Document Type and Number:
Japanese Patent JPH08507343
Kind Code:
A
Abstract:
A pressure sensitive valve for a fluid-actuated percussive drill includes passageways for fluid flow to expose a valve surface to a burst of short-interval, high pressure fluid from a drive chamber to cause early closing of the valve.
Inventors:
Hu, Chuen Chen
Ray, Warren Tea
Ray, Warren Tea
Application Number:
JP51997994A
Publication Date:
August 06, 1996
Filing Date:
February 03, 1994
Export Citation:
Assignee:
Ingersoll Land Company
International Classes:
E21B4/00; B25D9/14; E21B4/14; (IPC1-7): E21B4/00
Attorney, Agent or Firm:
Warren G. Simor