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US 5,222,399 AGranted
Load washer
AssigneeFel-Pro Incorporated
InventorHarry C. Kropp
Life of this patent
Estimating the term…
Abstract
A load washer comprising a pair of thin metal washers between which a contact sensor is positioned. The contact sensor includes pairs of confronting electrodes at a plurality of spaced zones with a pressure sensitive resistive material between each pair, which, under pressure, provide an indication of the force applied to the load washer.
Claims10
A thin circular load washer comprising:
- a first thin plate defining an outer perimeter and a central opening,
- a second thin plate defining an outer perimeter and a central opening, and
- a load sensor positioned and permanently mounted between said plates, said load sensor defining a central opening and comprising,
- first electrode means on a first thin plastic sheet,
- second electrode means on a second thin plastic sheet confronting said first electrode means to define a plurality of pairs of confronting electrodes defining a plurality of points of confrontation of said first and second electrode means, said points of confrontation being distributed in equidistantly spaces zones around said load washer and within said outer perimeters,
- a pressure sensitive resistive material interposed between said pairs of electrodes at each of said points of confrontation, and
- conductors for all of said first and second electrode means extending beyond said outer perimeters and existing only at one peripheral location on said perimeters, and each said conductor terminating in a contact.
4 more elements
A load washer comprising:
- a first thin plate defining an outer perimeter,
- a second thin plate defining an outer perimeter, and
- a load sensor positioned between said plates, said load sensor comprising,
- first electrode means,
- second electrode means confronting said first electrode means within said outer perimeters,
- a pressure sensitive resistive material between said electrode means at each said intersection,
- conductors for said first and second electrode means extending beyond said outer perimeters, and each said conductor terminating in a contact,
- and wherein said first and second electrode means each include a plurality of electrodes defining plural points of confrontation, said points of confrontation being distributed in circumferentially equidistantly spaced zones.
5 more elements
A load washer which is generally circular in plan view defining a central opening for a bolt comprising:
- a first thin plate defining an outer perimeter,
- a second thin plate defining an outer perimeter, and
- a load sensor positioned between said plates, said load sensor comprising,
- first electrode means comprising at least two electrodes,
- second electrode means comprising at least two electrodes crossing and intersecting said first electrode means to define points of confrontation thereof within said outer perimeters, said electrode means defining plural points of confrontation, said points of confrontation being distributed in at least three equidistantly spaced zones, said zones being generally radially equidistant from the center of said load washer and being spaced equidistantly from each other along a circle generated about the center of said load washer,
- a pressure sensitive resistive material between said electrode means at said points of confrontation, and
- conductors for said first and second electrode means extending beyond said outer perimeters, and each said conductor terminating in a contact.
4 more elements
Dependencies are inferred from the claim text.