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Flat resistance for blower control unit for automobile air conditioner and blower control unit using the same

  • US 5,192,940 A
  • Filed: 12/31/1990
  • Issued: 03/09/1993
  • Est. Priority Date: 10/07/1988
  • Status: Expired due to Term
First Claim
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1. A flat resistance comprising:

  • a porcelain enameled metallic substrate including a flat head portion, having an edge, and parallel terminal supporting the head portion and the terminal supporting portions forming one surface;

    a resistance circuit printed on the one surface of the head portion, the resistance circuit including a plurality of electrically interconnected resistances, at least one of the resistances having a first portion and a second portion, said first portion and said second portion each having a fuse connecting end, said fuse connecting end defining a gap between the first portion and the second portion, at lest one of the fuse connecting ends comprising fuse attracting means;

    a temperature fuse interposed in the resistance circuit and adapted to melt to break the resistance circuit when the porcelain enameled metallic substrate substantially reaches a permissible maximum temperature at a portion thereof, the temperature fuse being provided in the vicinity of the portion of the substrate, the temperature fuse being electrically coupled to the fuse connecting ends of the first portion and the second portion, the fuse attracting means attracting the temperature fuse when the temperature fuse is in a molten state when the substrate reaches the permissible maximum temperature; and

    terminal means, printed on the one surface of both the head portion and the terminal supporting portions, the terminal means including terminals each connected to one end of a corresponding one of the resistances.

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