Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1978-12-04
1979-07-03
Mayewsky, Volodymyr Y.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
219430, 219433, 219435, 219441, 219463, 219521, 338225D, 99444, F27D 1102
Patent
active
041601521
ABSTRACT:
A heating unit is provided in the form of an open topped container with a side wall and a bottom. The side wall has a plurality of bosses each of which has a plate-receiving groove. The bottom has on its upper surface elongated seat defining flanges, a barrier wall projecting between and extending laterally beyond a pair of seat defining flanges to separate the seats and to separate a pair of wires, and labyrinth walls defining a strain-relief circuitous wire passage. A pair of spring terminals are provided, each having a U-shaped part defined by two divergent leg parts one of which is seated in one of the seats and the other of which extends upwardly away from the bottom to a free end. A disc of PTCR material is mounted on the spaced free ends. A plate is snapped into the plate-receiving grooves of the bosses. The disc is forced by the plate to compress the terminal legs against their spring bias to hold the disc in snug electrical and mechanical contact with the terminal legs, and to hold the terminals against upward movement by the disc and sideways movement by the terminal seat-defining flanges.
REFERENCES:
patent: 3514579 (1970-05-01), Sanders
patent: 3519798 (1970-07-01), Walther
patent: 3720807 (1973-03-01), Ting
patent: 3778594 (1973-12-01), Wightman
patent: 3876861 (1975-04-01), Wightman et al.
patent: 3909592 (1975-09-01), Eide
patent: 3987275 (1976-10-01), Hurko
patent: 4049949 (1977-09-01), Fitzsimmons
patent: 4072091 (1978-02-01), Richardson
Wightman John W.
Wightman Lawrance W.
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