Electrical device termination high temperature indicator
First Claim
1. A high temperature indicator for an electrical power circuit connected to at least one termination, comprising:
- on/off indicating means;
a thermistor electrically coupled in series with said indicating means across said power circuit, said thermistor being thermally coupled to said termination, andresistance means electrically coupled in parallel with said indicating means.
1 Assignment
0 Petitions
Accused Products
Abstract
Temperature indicating apparatus for sensing overheating at a pair of terminals on an electrical power line comprises a neon gas-filled glow tube and a thermistor electrically coupled in series across the terminals, with a resistor electrically coupled in parallel with the glow tube. The thermistor is thermally coupled to the terminations so that an excessive temperature rise at either terminal decreases the thermistor resistance to a level at which sufficient voltage appears across the glow tube to ignite the glow tube and provide a visual indication of overheating. The circuit readily lends itself to a plug-in type configuration if the terminals to be monitored are in a duplex receptacle, or to employment in a cube tap.
-
Citations
30 Claims
-
1. A high temperature indicator for an electrical power circuit connected to at least one termination, comprising:
-
on/off indicating means; a thermistor electrically coupled in series with said indicating means across said power circuit, said thermistor being thermally coupled to said termination, and resistance means electrically coupled in parallel with said indicating means. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A high temperature indicator for an electrical power circuit connected to a pair of terminations, comprising:
-
on/off indicating means; a thermistor electrically coupled in series with said indicating means and adapted to be connected across said power circuit, said thermistor being adapted to be thermally coupled to at least one of said terminations; resistance means electrically coupled in parallel with said indicating means; and supporting means surrounding and enclosing said thermistor, said resistance means, and a portion of said indicating means, so as to provide structural rigidity thereto. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
-
-
29. A high temperature indicator for an electrical power circuit connected to at least one termination, comprising:
-
on/off indicating means; resistance means electrically coupled in series with said indicating means across said power circuit; and a positive temperature coefficient of resistance device coupled in parallel with said indicating means and being thermally coupled to said termination. - View Dependent Claims (30)
-
Specification