A female part and method for manufacturing female parts

E - Fixed Constructions – 21 – B

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E21B 17/042 (2006.01)

Patent

CA 2652275

The present invention relates to a female part intended for top ham- mer-drilling equipment and a method for manufacturing female parts. The female part has a thread in the form of a ridge (2) in a wall (5). The ridge is delimited by a crest (9) and two flanks (10) between which a likewise helical groove (11 ) having a bottom (12) runs. An end the of the groove (11) is defined by a borderline (18), which separates the groove bottom (12) from a part surface (19) formed in the inside of the wall (5), the width of which part surface successively decreases in the peripheral direction, and which has a rotationally symmetrical shape essentially similar to the rotationally symmetrical basic shape of the thread (1).

La présente invention concerne une pièce femelle prévue pour un équipement de forage par battage par le haut et un procédé pour fabriquer des pièces femelles. La pièce femelle comporte un filet sous forme de strie (2) dans une paroi (5). La strie est délimitée par une crête (9) et deux flancs (10) entre lesquels passe une rainure également hélicoïdale (11) qui possède un fond (12). Une extrémité de la rainure (11) est définie par une limite (18) qui sépare le fond de rainure (12) et une surface de pièce (19) formée dans la partie intérieure de la paroi (5), la largeur de cette surface de pièce diminuant successivement dans la direction périphérique, et qui comporte une forme symétrique de façon rotative essentiellement similaire à la forme de base symétrique de façon rotative du filet (1).

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