Rock-drilling equipment as well as female and male parts...

E - Fixed Constructions – 21 – B

Patent

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E21B 17/042 (2006.01)

Patent

CA 2685254

The invention relates to a threaded joint for rock-drilling equipment of the type that includes female and male parts that are interconnected via threaded joints. The invention is particularly advantageous in connection with female parts (1) of the type that includes an internal trapezoidal thread in the form of a helix thread ridge, which is delimited by a top and two flanks (12a, 12b), a groove (13), having a bottom (14), running between two tops, and which thread ridge extends a plurality of turns between a front end and a rear end, the thread top touching an imaginary cylinder or cone that is concentric with a centre axis of the female part. According to the invention, the bottom (14) of the thread groove has a concave and partially circular cross-section shape along at least a part of the extension of the groove, and transforms into flanks via concave radius transitions (22), the radii (r2) of which decrease in the direction from the front end of the thread toward the rear one, at the same time as the radius (r1) of the groove bottom (14) increases in the same direction.

L'invention concerne une liaison filetée pour équipement de forage de roche du type qui comprend des parties femelle et mâle qui sont reliées mutuellement via des liaisons filetées. L'invention est particulièrement avantageuse en liaison avec les parties femelles (1) du type qui comprend un filet trapézoïdal intérieur ayant la forme d'une arête de filet en hélice, qui est délimitée par une partie supérieure et deux flancs (12a, 12b), une gorge (13), ayant un fond (14), s'étendant entre deux parties supérieures, l'arête de filet s'étendant sur une pluralité de spires entre une extrémité avant et une extrémité arrière, la partie supérieure de filet venant toucher un cylindre ou un cône imaginaire qui est concentrique avec l'axe central de la partie femelle. Selon l'invention, le fond (14) de la gorge de filet a une section transversale concave et partiellement circulaire le long d'au moins une partie de l'étendue de la gorge, et se transforme en flancs via des transitions à rayon concave (22), dont les rayons (r2) diminuent dans la direction allant de l'extrémité avant du filet vers l'extrémité arrière, en même temps que le rayon (r1) du fond de la gorge (14) augmente dans la même direction.

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