Bench flotation sensor

U.S. Patent Number: 5321267

Abstract: A noncontact bench flotation sensor system for use with a flotation bench. The system comprises a plurality of reflectors that are disposed on the body of the bench, typically on the inside of the skirt or overhanging portion of the table surface of the bench. Each reflector is such that it reflects over a narrow region, or angle. Two sensor assemblies, preferably infrared, are disposed adjacent each reflector and are located on each leg of the bench. Each of the sensor assemblies is comprised of an transmitter and an detector. The two sensor assemblies are separated by a distance that corresponds to upper and lower limits of bench flotation. The sensor assemblies transmit infrared energy, for example, at the reflector. In the event that the isolator moves to a point where one of the transmitters is aligned with the reflector, energy is reflected back to the associated detector, and the reflected energy is detected. Output signals are generated by the sensor assemblies that are indicative of in flotation and out-of-flotation conditions of the bench. These signals are coupled to a display unit. The display unit incorporates a plurality of light emitting diodes (LEDs) that correspond to each of the possible flotation conditions, and an annunciator. In-flotation signals from the sensor assemblies are used to light selected LEDs, while out of flotation output signals from the sensor assemblies are used to light other LEDs and sound an alarm. This alerts an operator that the bench is out of flotation, permitting the operator to correct the problem.

Inventors: Song; Lynden A. (Hawthorne, CA), Conroy; Karl B. (Long Beach, CA), Reed; Robert A. (Redondo Beach, CA)

Assignee: Hughes Aircraft Company (Los Angeles, CA)

Application Number: 07/951,510

Issued: 1994-06-14

Expired: 2006-06-14

Classes: 250/349 ; 250/347; 356/620

Field of search: 356/373 250/561,349,347

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