Electric heating – Heating devices – Combined with diverse-type art device
Patent
1986-01-13
1987-03-24
Goldberg, E. A.
Electric heating
Heating devices
Combined with diverse-type art device
5424, 5451, 219518, H05B 102
Patent
active
046527265
ABSTRACT:
A normally flat horizontal blanket-type waterbed heater unit having top and bottom laminates of thin flexible dielectric sheet plastic material and an elongate electric resistance element arranged and sealingly engaged between the laminates. A power supply cord connects with opposite ends of the element and extends from the unit. The unit further includes a normally open safety switch connected with and between related ends of sections of the element. The switch includes spaced terminals atop the bottom laminate, a contact bar above the terminals and below the top laminate and a resilient insulating support part between the laminates and adjacent the terminals and bar. The part normally yieldingly holds the bar and adjacent portion of the top laminate spaced above the terminals. The unit is arranged atop a water bed mattress supporting platform and below the bottom wall of a sheet plastic waterbed mattress bladder. The safety switch is such that when the depth of the water in the mattress is above a minimum safe depth, the weight of the water acting on the switch closes the switch. When the depth of the water in the mattress is below a safe minimum depth, the support part of the switch moves the bottom wall, adjacent portion of the top laminate and the bar vertically relative to and out of contact with the terminals.
REFERENCES:
patent: 4066072 (1978-01-01), Cummins
patent: 4067005 (1978-01-01), Levy
patent: 4263586 (1981-04-01), Nicholas
Femino John A.
Mitchener Wilbur E.
Moss Roy D.
Stevens Albert
Goldberg E. A.
Maxwell Georges A.
Walberg Teresa J.
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