Flat resistance for blower control unit for automobile air conditioner and blower control unit using the same
First Claim
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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Accused Products
Abstract
A flat resistance for a blower control unit of an automobile air conditioner, and a blower control unit using the same. The flat resistance includes: a porcelain enameled metallic substrate including a flat head portion, having an edge and one surface, and parallel terminal supporting portions projecting outwardly from the edge of the head; a resistance circuit printed on the one surface of the head portion, the resistance circuit including a plurality of resistances electrically connected in series; a temperature fuse, interposed in the resistance circuit, for being tripped to break the resistance circuit when the porcelain enameled metallic substrate becomes overheated; and terminals, printed on both the head portion and the terminal supporting portions, each terminal being connected to one end of a corresponding one of the resistances.
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Citations
19 Claims
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1. A flat resistance comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A flat resistance comprising:
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a porcelain enameled metallic substrate including a flat head portion, having an edge, and at least three parallel terminal supporting portions projecting outwardly from the edge of the head portion, 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 at least three resistances electrically connected in series-parallel fashion, each of the resistances having different resistance values, at least one of the resistances having a first portion and a second portion; 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, t he temperature fuse being provided in the vicinity of the portion of the substrate, the temperature fuse being electrically coupled to the first portion and the second portion;
; andterminal means, printed on the one surface of both the head portion and the terminal supporting portions, the terminal means including at least three electrically conductive terminals each connected to both one end of the one of said at least three resistances and one of said terminal supporting positions, said electrically conductive terminals having a sheet resistance smaller than the resistance to which it is connected. - View Dependent Claims (18, 19)
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Specification