Work holders – Relatively movable jaws – Including constrictable loop jaw
Patent
1988-02-16
1989-10-10
LaRoche, Eugene R.
Work holders
Relatively movable jaws
Including constrictable loop jaw
269131, 269132, B25B 104, B25B 120
Patent
active
048726559
ABSTRACT:
An apparatus and method are disclosed for holding a generally cylindrical workpiece for honing or otherwise machining an internal bore. The workpiece is held by a gripping surface over most of the innermost turn of a spirally wound spring and coil. The workpiece is grasped circumferentially over its outer surface without excess contact pressure at any particular point. A tendency of the machining operation to rotate the workpiece serves to secure the workpiece more tightly in position by tightening the outer turns of the spring band coil. A rotatable tensioning member acts under the influence of a biasing spring to decrease the diameter of the innermost turn of the spring band coil to bring the gripping surface into contact with the workpiece. A method for adapting the work-holding apparatus to smaller or inrregularly shaped workpieces consists of molding an annular piece around the workpiece. The molded annular piece has an adhesive layer impregnated with an abrasive grit to grip the outer circumference of the workpiece. An alternative embodiment of the apparatus comprises an annular housing into which a removable cartridge holding a spring band coil can be inserted and fixed in position. A series of cartridges, each employing a different size of spring band coil, provides a work-holding apparatus that can be used with a wide range of workpiece diameters.
REFERENCES:
patent: 1527314 (1925-02-01), Lally
patent: 1625251 (1927-04-01), Fodge
patent: 2480369 (1949-08-01), Jasper
patent: 2549084 (1951-04-01), Heth
Bissell Henry M.
LaRoche Eugene R.
McCutcheon Nathan W.
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