Chucks or sockets – With fluid-pressure actuator – Socket type
Patent
1990-05-29
1991-03-19
Bishop, Steven C.
Chucks or sockets
With fluid-pressure actuator
Socket type
269130, 279 33, 279106, 279114, B23B 3110, B25B 104
Patent
active
050004654
ABSTRACT:
Apparatus is 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 torsion band 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 tension band coil. A rotatable tensioning member acts under the influence of a biasing spring to decrease the diameter of the innermost turn of the tension band coil to bring the gripping surface into contact with the workpiece. The outer diameter of the tension band coil is variable under the influence of a plurality of segmented support members which are adjustable radially inward and outward to extend the range of utility of the tension band coil. This radial adjustment is accomplished through the action of an associated cam plate which engages the support segments to control their radial movement and positioning in unison. An alternative arrangement uses a plurality of torque bands, instead of the single torsion band coil, which overlap about the workpiece opening to achieve the desired gripping effect. The degree of overlap, and thus the size of the opening, is controlled by an associated cam disk.
REFERENCES:
patent: 4778252 (1988-10-01), Filho
patent: 4819527 (1989-04-01), Redman
patent: 4872655 (1989-10-01), Seele
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