Title:
SHOCK ABSORBING DEVICE FOR HYDRAULIC ROTARY HITTING APPARATUS
Document Type and Number:
WIPO Patent Application WO/2014/104608
Kind Code:
A1
Abstract:
The present invention relates to a hydraulic rotary hitting apparatus provided with a shock absorbing device for firmly maintaining the contact between a drill bit and an object to be drilled during boring by means of a hydraulic process, comprising a hitting piston rise line for supplying a high pressure working fluid to reciprocate the hitting piston, a hydraulic motor drive line provided separately from the hitting piston rise line for rotating a hydraulic motor, and a valve means for selectively connecting one of the hitting piston rise line and the hydraulic motor drive line to a high pressure chamber of the shock absorbing device, so as to prevent the shock absorbing device from contacting the internal elements of the hitting apparatus both in the normal boring condition where the rise of the hitting piston and the rotation of the hydraulic motor are all performed and in the abnormal condition where the hydraulic motor rotates only in the forward or the backward direction, thus improving the durability of the internal elements of the hitting apparatus.
Inventors:
KIM JIN-KOOK (KR)
LIM JONG-HYUK (KR)
LIM JONG-HYUK (KR)
Application Number:
PCT/KR2013/011251
Publication Date:
July 03, 2014
Filing Date:
December 06, 2013
Export Citation:
Assignee:
EVERDIGM CORP (KR)
International Classes:
E21B4/02; E21B1/38
Foreign References:
| EP0112810A2 | 1984-07-04 | |||
| US20040112649A1 | 2004-06-17 | |||
| US20050016774A1 | 2005-01-27 | |||
| KR20040095120A | 2004-11-12 | |||
| KR20100039036A | 2010-04-15 |
Attorney, Agent or Firm:
SINJI PATENT FIRM (KR)
특허법인 신지 (KR)
특허법인 신지 (KR)
Download PDF: