Scroll chuck for lathe

B - Operations – Transporting – 23 – B

Patent

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Details

B23B 31/16 (2006.01) B23B 31/163 (2006.01)

Patent

CA 2070520

A scroll chuck for holding a workpiece in a lathe includes a jaw holder having a front side and a rear side, radially extending slots in the front side and means for attaching the holder to the lathe for turning about a central axis. Two or more jaw devices are mounted in the slots and are radially movable therein. A scroll member is rotatably mounted on the holder and has a spiral-shaped rib formed on a front surface thereof. This rib extends along recesses formed on the jaw devices whereby rotation of the scroll member causes the jaw devices to move in the radial direction. A pin member is arranged on one of the jaw devices and extends from a rearwardly facing surface of the device and into an elongate recess formed in the holder. This pin member prevents the jaw device from accidentally disengaging from the holder.

Mandrin autocentreur servant à retenir une pièce à usiner sur un tour comprenant un porte-mors avec un côté avant avec fentes radiales et un côté arrière ainsi que des dispositifs pour fixer le porte-mors au tour pour le faire tourner sur un axe central. Deux mors ou plus sont placés dans les fentes et peuvent se déplacer radialement dans celles-ci. Un élément d'autocentrage est fixé en montage tournant au porte-mors et comporte une nervure en spirale sur une surface avant. La nervure s'insère dans des creux formés sur les mors au moyens desquels la rotation de l'élément d'autocentrage entraîne les mors dans un mouvement radial. Une goupille est fixée sur la surface faisant face vers l'arrière d'un mors et pénètre dans un creux allongé sur le porte-mors. Cette goupille empêche le mors de se détacher accidentellement du porte-mors.

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