Drill bushing

Details Drill bushing Drill bushing

E - Fixed Constructions

21

B

E21B 6/00 (2006.01) B25D 17/08 (2006.01) E21B 1/02 (2006.01)

Patent

CA 2579306

The invention relates to a drill bushing for engagement with a drilling steel, wherein said drill bushing (2) has contact surfaces (4) for contact with a drilling steel (1) , said contact surfaces (4) having interior, inwards curved shapes, whereby edge abutment of a drilling steel (1) against said contact surfaces (4) is avoided. By way of the invention, a better wear picture is obtained for the shank of a drilling steel.

L'invention concerne un canon de perçage dans lequel s'emmanche un fleuret. Ce canon de perçage (2) présente des surfaces de contact (4) qui sont contact avec le fleuret (1). Ces surfaces de contact (4) possèdent des formes intérieures tournées vers l'intérieur qui empêchent le fleuret (1) de buter contre les surfaces de contact (4). L'invention permet ainsi une meilleure usure de la tige du fleuret.

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