A wrench for use with drilling apparatus

B - Operations – Transporting – 25 – B

Patent

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Details

B25B 13/50 (2006.01) B25B 21/00 (2006.01) E21B 19/16 (2006.01)

Patent

CA 2404336

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.

La présente invention concerne une clé de serrage pour une foreuse servant à forer des trous dans le sol au moyen d'un trépan comprenant un segment de forage, des segments d'extension, et une allonge qui relie le trépan à l'appareil. Les segments du trépan sont reliés par des filetages complémentaires selon une logique d'ergot et de douille, la clé de serrage servant à déserrer les segments consécutifs les uns des autres de façon à permettre l'intercalage ou le retrait des segments de prolongation. La clé de serrage (10) comprend un bras à griffe (12) définissant une formation à embouchure venant autour d'un segment de trépan (26) et un levier (18) s'articulant sur le bras. Le levier définit une face biseautée (34) qui, sous l'effet du déplacement initial du levier, est capable d'appliquer le segment de trépan (26) en relation d'engagement par griffe avec les formations à griffes opposées (30) situés sur le bras à griffes, et qui, par la poursuite du déplacement permet de libérer le segment de trépan d'un segment consécutif.

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