Title:
DRILL BIT WITH BOTH DRILLING AND REAMING FUNCTION
Document Type and Number:
WIPO Patent Application WO/2008/046297
Kind Code:
A1
Abstract:
A drill bit (100) includes: a drill shank (1) suitable to connect with the power driving
source; a drill stem (9) which has a drill edge (12) formed on its lower end and has
a through hole (11) penetrating said drill stem (9) near its lower end; a reaming
edge (10), which is provided in said through hole (11) and can move between a protrusion
position in which said reaming edge (10) radially protrudes from said through
hole (11) in part and a retraction position in which said reaming edge (10) retracts
back into said though hole (11); and a converting unit (4) which drives said reaming
edge (10) to move between the protrusion position and the retraction position.
Inventors:
LAI QIDAN (CN)
ZHANG LINGXUE (CN)
ZHANG LINGXUE (CN)
Application Number:
PCT/CN2007/002890
Publication Date:
April 24, 2008
Filing Date:
October 08, 2007
Export Citation:
Assignee:
LAI QIDAN (CN)
ZHANG LINGXUE (CN)
ZHANG LINGXUE (CN)
International Classes:
E21B10/26; B23B51/08; B28D1/14; E21B10/32
Domestic Patent References:
| WO2005037473A1 | 2005-04-28 |
Foreign References:
| JPH05123914A | 1993-05-21 | |||
| JPH08141806A | 1996-06-04 | |||
| US5735650A | 1998-04-07 | |||
| US6427788B1 | 2002-08-06 | |||
| CN1064634A | 1992-09-23 |
Attorney, Agent or Firm:
CHINA SCIENCE PATENT & TRADEMARK AGENT LTD. (Building BTsinghua Tongfang Hi-Tech Plaza,No. 1, Wangzhuang Road,Haidian District, Beijing 3, CN)
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