Gauge having a surface follower with peripheral vent

Details Gauge having a surface follower with peripheral vent Gauge having a surface follower with peripheral vent

1981-04-20

1984-03-06

Goldberg, Gerald

Measuring and testing

With fluid pressure

Dimension, shape, or size

324229, G01B 1306, G01B 1304

Patent

active

044346492

ABSTRACT:
An apparatus such as a caliper gauge can be utilized in performing a measurement, such as a thickness measurement, of a traveling sheet or the like. The apparatus comprises a surface follower body (18, 72, 74) adapted to be constrained during the measurement for movement along a surface follower path intersecting the path of the sheet (10, 80) and urged by a force toward one surface of the sheet. The body has a gas confining wall (32a, 90, 104) bounded by a uniformly distributed pressurized gas supply aperture or apertures (46, 92, 106) for pressurizing a gas bearing region (48, 108, 110) contiguous to the sheet surface with sufficient pressure against the sheet and the wall to levitate the body against the urging force. The pressurization is effected without producing substantial amounts of high velocity gas flow over the surface of the sheet within the gas bearing region. The body is maintained at a distance from the sheet surface that is substantially constant and relatively unaffected by variations in the roughness of the surface.

REFERENCES:
patent: 1946924 (1934-02-01), Allen et al.
patent: 3321838 (1967-05-01), Albertson, Jr.
patent: 3495442 (1970-02-01), Rejsa
patent: 3528002 (1970-09-01), Dunlavey
patent: 3648587 (1972-03-01), Stevens
patent: 3855524 (1974-12-01), Crawford
patent: 3948082 (1976-04-01), Zumbach et al.
patent: 4107606 (1978-08-01), Typpo et al.

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