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US 5,221,828 AGranted
Heated wiper blade using conductive elastomer
AssigneeGeneral Motors Corporation
InventorsRafil A. Basheer, Ismat A. Abu-Isa, Darrel S. Nelson
Life of this patent
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Abstract
A heated wiper blade has a conductive elastomer body and a pair of electrodes along each side of the body. The elastomer which has a resistivity in the range of 20-128 ohm-cm and a hardness of Shore A 64-70 comprises a rubber compound including carbon black in the range of 37-60 phr, a small amount of graphite in the range of 13 to 20 phr and a low concentration of plasticizer oil in the range 20-40 phr.
Claims9
A heated wiper blade comprising:
- a conductive elastomer body;
- and
- means for applying electrical current to the body including a pair of electrodes extending along the body in electrical contact therewith;
- the conductive elastomer having a hardness in the range of 50 to 70 Shore A and a conductivity sufficient to heat the blade when energized, and wherein the elastomer includes graphite in the range of about 13 to 20 parts per hundred parts of elastomer and carbon black.
1 more element
A heated wiper comprising:
- a conductive elastomer body;
- and means for applying electrical current to the body including a pair of electrodes extending along the body in electrical contact therewith;
- the conductive elastomer comprising a matrix of natural rubber containing carbon black, graphite and plasticizer, the graphite and plasticizer having low concentrations sufficient to increase the electrical conductivity of the elastomer and reduce the hardness of the elastomer to a hardness suitable for windshield wiper blades.
A heated wiper blade comprising:
- a conductive elastomer body;
- and
- means for applying electrical current to the body including a pair of electrodes extending along the body in electrical contact therewith;
- the conductive elastomer comprising a matrix of natural rubber containing a filler in the range of about 50 to 80 parts per hundred parts of rubber, the filler comprising about one part of graphite to three parts of carbon black, and a plasticizer comprising about two parts of oil to one part of graphite.
1 more element
Dependencies are inferred from the claim text.