Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1989-03-06
1991-12-10
Paschall, Mark H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219491, 219494, 156359, H05B 102
Patent
active
050720970
ABSTRACT:
A temperature sensitive motor control for use in roofing membrane welding devices is described. The control circuit gives an output impedance responsive to variations in the temperature of the welding device and ambient temperature. A thermocouple provides a voltage signal responsive to changes in the temperature of the heating plate of the welding device. An ambient temperature sensitive circuit element acts in conjunction with the input signal to provide an output signal that is responsive to both ambient temperature and heating plate temperature. The output signal is applied to a voltage variable impedance element which outputs an impedance that is a function of both application temperature and ambient temperature. In one preferred embodiment of the present invention, the ambient temperature sensitive circuit element is a thermistor. In an alternate preferred embodiment of the present invention, the ambient temperature sensitive circuit element is a diode-comparator circuit.
REFERENCES:
patent: 3308271 (1967-03-01), Hilbiber
patent: 3393870 (1968-07-01), Jeffrey
patent: 3833794 (1974-09-01), Moriyama
patent: 4370546 (1983-01-01), Warner
patent: 4814583 (1989-03-01), Rainey
Mweld, Inc.
Paschall Mark H.
LandOfFree
Speed control for roof welding apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Speed control for roof welding apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Speed control for roof welding apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1042627