Chucks or sockets – Radially reciprocating jaws – Spiral cam or scroll actuated
Patent
1991-07-01
1992-08-25
Bishop, Steven C.
Chucks or sockets
Radially reciprocating jaws
Spiral cam or scroll actuated
279123, 279125, B23B 31163
Patent
active
051412390
ABSTRACT:
An improved scroll chuck for holding a workpiece in a lathe including 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.
REFERENCES:
patent: 3704022 (1972-11-01), Blattry et al.
patent: 4007943 (1977-02-01), Scharfen et al.
patent: 4026566 (1977-05-01), Rohm
patent: 4640518 (1987-02-01), Ferraro
Nova 4-Jaw Chuck, in The Woodturners Catalog 1990/91 from Craft Suppolies U.S.A., Provo, Utah. Pages 14 & 15.
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