E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 23/01 (2006.01)
Patent
CA 2720813
A head assembly includes a body, a spearhead operatively associated with the body and configured to translate axially relative to the body, and at least one latch operatively associated with the spearhead and the body. The latch is configured to move between an extended position and a retracted position relative to the body in response to axial translation of the spearhead relative to the body. In an extended position, the latch covers more than 25% of the circumference of the body adjacent the latches.
Selon l'invention, un ensemble tête comprend un corps, une pointe associée de manière fonctionnelle au corps et conçue pour se déplacer axialement relativement au corps, et au moins un cliquet associé de manière fonctionnelle à la pointe et au corps. Le cliquet est conçu pour passer d'une position sortie à une position rentrée par rapport au corps, en réaction au déplacement axial de la pointe relativement au corps. Dans la position sortie, le cliquet recouvre plus de 25% de la circonférence du corps jouxtant les cliquets.
Able Robert E.
Oothoudt Thomas J.
Bennett Jones Llp
Longyear Tm Inc.
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