Title:
A WRENCH FOR USE WITH DRILLING APPARATUS
Document Type and Number:
WIPO Patent Application WO2001072476
Kind Code:
A3
Abstract:
The invention relates to a wrench for use with drilling apparatus used for drilling holes in the ground with a drill bit comprising a drilling segment, extension segments and a distance piece which connects the drill bit to the apparatus. The drill bit segments are connected via complementary threads in a spigot and socket fashion and the wrench serves to loosen adjacent segments with respect to one another in order to accommodate the insertion or removal of extension segments. The wrench (10) comprises a gripping arm (12), defining a mouth formation locatable around a drill bit segment (26), and a lever (18) pivotally connected to the arm. The lever defines a wedge face (34) which, through initial displacement of the lever can urge the drill bit segment (26) into gripping engagement with opposing gripping formations (30) located on the gripping arm and through continued displacement can loosen the drill bit segment with respect to an adjacent segment.
Inventors:
GOUWS PETRUS CHRISTIAAN (ZA)
Application Number:
PCT/IB2001/000507
Publication Date:
April 04, 2002
Filing Date:
March 28, 2001
Export Citation:
Assignee:
GOUWS PETRUS CHRISTIAAN (ZA)
International Classes:
B25B13/50; E21B19/16; (IPC1-7): B25B13/50; B25B21/00; E21B19/16
Domestic Patent References:
| WO1989009115A1 | 1989-10-05 |
Foreign References:
| US1599808A | 1926-09-14 | |||
| US1855143A | 1932-04-19 | |||
| US1690007A | 1928-10-30 | |||
| US6012360A | 2000-01-11 | |||
| US4308767A | 1982-01-05 |
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