Work holders – Holder mounted for movement – Means for position lock
Patent
1995-07-11
1997-10-14
Eley, Timothy V.
Work holders
Holder mounted for movement
Means for position lock
269 57, B23Q 125
Patent
active
056763603
ABSTRACT:
A rotary table lockdown apparatus made a part of a computer controlled dicing saw holds a table work surface parallel to a reference surface independent of axial misalignment and without rotational movement. The apparatus includes a deflectable disk rotor radially extended from the table within a plane parallel to the reference surface. A piston styled plunger is biased against a top surface of the rotor forcing it into frictional contact with the reference surface for holding the table and thus the work surface in a rigid position for operation on a workpiece removably attached to the work surface. A chamber is pressurized to displace the plunger in a piston-like manner against a top surface of the rotor. A flexible O-ring holds the plunger in sealable contact with chamber walls and with increased pressure in the chamber flexes to permit the displacement of the plunger. Upon release of the pressure, the flexible O-ring pulls the plunger out of contact with the rotor permitting the table to be rotated. To provide further rigidity, a ball bearing assembly operating within a table rotation shaft and bore permits free rotation of the shaft within the bore under chamber ambient pressure conditions. During chamber increased pressure, displacement of the rotor also results in longitudinal displacement of the shaft forcing the ball bearings to bias against opposing shaft and bore race edges preventing axial misalignment of the shaft and thus table work surface.
REFERENCES:
patent: 1804185 (1931-05-01), Skopik
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patent: 3841453 (1974-10-01), Culbertson
patent: 4188719 (1980-02-01), Hoff
patent: 4688974 (1987-08-01), Wright et al.
patent: 4838979 (1989-06-01), Nishida et al.
patent: 5322079 (1994-06-01), Fukutomi et al.
Bajune David E.
Boucher John N.
Eley Timothy V.
Wilson Lee
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