Thomas J Stone

US Patent:

53792696, Jan 3, 1995

Filed:

Jan 13, 1993

Appl. No.:

8/003786

Inventors:

Seymour J. Sindeband - Pound Ridge NY
Thomas L. Stone - Beacon Falls CT

Assignee:

Science Accessories Corp. - Stratford CT

International Classification:

G08C 2100

US Classification:

367127

Abstract:

An apparatus is disclosed for determining the position of a moveable element over the surface of a solid medium. First and second transducer devices are provided and are moveable for placement at selected respective first and second locations on the surface for coupling with said surface. A third transducer device, for coupling with said surface, is mounted with the moveable element. Ultrasonic energy is transmitted, in either direction, between the third transducer device and the first and second transducer devices, the ultrasonic energy travelling through said solid medium. The transit times of the ultrasonic energy propagating, in either direction, between the third transducer device and the first and second transducer devices are determined, the transit times being indicative of the position of the third transducer device with respect to the first and second transducer devices. In a disclosed embodiment, the first and second transducer devices have tips that are feet of a housing and contact the surface over an area that is less than 2 mm. sup. 2 and preferably, less than 0. 5 mm. sup. 2.

Address:

7389 Hillside Turn, Mount Airy, MD 21771

VIN:

5TEUX42N67Z385524

Make:

TOYOTA

Model:

TACOMA

Year:

2007