The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 06, 1984
Filed:
Apr. 20, 1981
Paul Williams, Columbus, OH (US);
AccuRay Corporation, Columbus, OH (US);
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.