Title:
TOP-SHEAVE FOR PREVENTING BENDING OF LEADER OF DRILLING MACHINE
Document Type and Number:
WIPO Patent Application WO/2018/008842
Kind Code:
A1
Abstract:
The present invention relates to top-sheaves for preventing a leader of a drilling machine from being bent, wherein the principle of the lever is applied to the top-sheaves of a leader so as to effectively distribute a load transmitted to the leader. Sufficient effects can thus be expected in which bending of the leader is prevented even without using a typical back-tension wire. Also, the present invention relates to top-sheaves for preventing a leader of a drilling machine from being bent, wherein ascending/descending wires are connected to a driving device unit, top-sheaves, upper and lower augers, and a leader, and the top-sheaves can be separated from each other in a predetermined section of the ascending/descending wires, thereby being able to reduce the wire connecting time of the ascending/descending wires.
Inventors:
NA CHOON SIK (KR)
NA KYUNG WON (KR)
NA KYUNG WON (KR)
Application Number:
PCT/KR2017/005303
Publication Date:
January 11, 2018
Filing Date:
May 23, 2017
Export Citation:
Assignee:
NA CHOON SIK (KR)
International Classes:
E21B7/02; E02F5/20; E21B3/02; E21B15/00
Foreign References:
| KR20110012476A | 2011-02-09 | |||
| JP2000118952A | 2000-04-25 | |||
| JP2011140801A | 2011-07-21 | |||
| KR20140129882A | 2014-11-07 | |||
| JP2010173833A | 2010-08-12 |
Attorney, Agent or Firm:
JANG, Won Chul (KR)
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