Drilling equipment and attachment means for the same

Details Drilling equipment and attachment means for the same Drilling equipment and attachment means for the same

E - Fixed Constructions

21

B

E21B 10/633 (2006.01) E21B 10/20 (2006.01) E21B 10/30 (2006.01)

Patent

CA 2760830

This invention relates to a ground drilling or cutting tool comprising a cutting element removably attached thereto by attachment means, the tool further including retention means adapted to maintain attachment of the cutting element to the tool in the event that the attachment means fails. The retention means comprises a first surface on a side of the cutting element, a mounting recess in the cutting tool in which at least a portion of said cutting element locates, a second surface in a side of the mounting recess against which said first surface locates, channels in each of said first and second surfaces that align so as to cooperatively define a dowel hole when said first and second surfaces locate together, at least one dowel that locates in the dowel hole, and means for retaining the or each dowel within the dowel hole.

La présente invention concerne un outil de forage de sol ou de coupe comprenant un élément de coupe fixé de façon mobile à l'outil par un moyen de fixation. L'outil comprend en outre un moyen de retenue conçu pour maintenir la fixation de l'élément de coupe à l'outil au cas où le moyen de fixation est défaillant. Le moyen de retenue comprend une première surface sur un côté de l'élément de coupe, une cavité de montage dans l'élément de coupe recevant au moins une partie dudit élément de coupe, une seconde surface dans un côté de la cavité de montage contre laquelle ladite première surface vient se loger, des voies dans chacune desdites première et seconde surfaces qui s'alignent de façon à définir de façon coopérative un trou de cheville lorsque lesdites première et seconde surfaces viennent se loger ensemble, au moins une cheville venant s'insérer dans le trou de cheville, et un moyen de retenue de la ou de chaque cheville à l'intérieur du trou de cheville.

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