Annular cutter connecting apparatus and annular cutter

B - Operations – Transporting – 23 – D

Patent

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Details

B23D 43/06 (2006.01)

Patent

CA 2138581

An annular cutter connecting apparatus includes an arbor, annular cutter fixing locking members received in holding holes formed in the lower end portion of the arbor and a sleeve member surrounding the lower end portion of the arbor, for fixing an annular cutter to the arbor. The sleeve has a first control face having an inner diameter equal to the outer diameter of the lower end portion of the arbor, for projecting the locking members into the central bore by a predetermined length when the first control face engages the locking members, and second control faces formed circumferentially in the first control face, for receiving the locking members. The sleeve is rotatable around its own axis so as to cause the locking members to selectively face the first control face and the second control faces, respectively. An annular cutter has a shank portion provided with locking member passing portion or portions on that part of the outer peripheral surface of the shank portion which corresponds to the holding holes of the annular cutter connecting apparatus. The shank portion has depressed locking member receiving portion formed in or on the locking member passing portion or portions and receive the locking members. The annular cutter is connected to and removed from the arbor in one-touch operation.

Cette invention concerne un raccord de trépan annulaire qui comprend un arbre, des éléments de retenue et de verrouillage se logeant dans des trous ménagés dans la partie inférieure de l'arbre et un manchon entourant cette partie inférieure de l'arbre. Le manchon comporte une première face de commande dont le diamètre intérieur est égal au diamètre extérieur de la partie inférieure de l'arbre et qui a pour fonction, au contact vec les éléments de verrouillage, de les déplacer sur une distance prédéterminée dans l'alésage central. Il comprend une seconde série de faces de commande disposées sur le pourtour de la première face de commande et qui ont pour rôle de recevoir les éléments de verrouillage. Le manchon est adapté pour pouvoir tourner autour de son axe longitudinal de manière à placer les éléments de verrouillage devant la première face de commande ou les secondes faces de commande. Le trépan annulaire comporte un tige présentant dans la partie de son pourtour correspondant à l'emplacement des trous de retenue des éléments de verrouillage un ou plusieurs segments de diamètre réduit pour pouvoir passer entre lesdits éléments de verrouillage. La tige du trépan comporte des évidements destinés à recevoir les éléments de verrouillage dans le ou les segments de diamètre réduit. Le trépan annulaire peut être raccordé à l'arbre d'entraînement en une seule opération.

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