Electric heating – Heating devices – With heater-unit housing – casing – or support means
Patent
1990-06-01
1992-03-10
Reynolds, Bruce A.
Electric heating
Heating devices
With heater-unit housing, casing, or support means
219523, 219544, 219534, H05B 300, H05B 382
Patent
active
050951939
ABSTRACT:
A cartridge heater for insertion within a heater bore-hole or cavity having a peripheral cavity wall surface. The cartridge heater includes an elongated generally cylindrical sheath having a heating element disposed therein and having an internal spring chamber intersected by a pair of elongated slots formed in the sheath. A generally V-shaped spring member is disposed within the spring chamber and has a pair of arcuately shaped arm portions projecting outwardly through the elongated slots for frictional engagement against the wall surface of the cavity to retain the cartridge heater within oversize cavities. The spring chamber may be formed as an extension of the forward or rearward ends of the cartridge sheath.
REFERENCES:
patent: 1279111 (1918-09-01), Homan
patent: 1312485 (1919-08-01), Krauth
patent: 1935560 (1933-11-01), Herold
patent: 2062424 (1936-12-01), Mueller
patent: 3412231 (1968-11-01), McElligott
patent: 3581056 (1981-05-01), Djenner
patent: 3643988 (1972-02-01), Ingvartsen
patent: 3937923 (1976-02-01), Smith
patent: 4822980 (1989-04-01), Carbone et al.
Ogden Manufacturing Co.
Reynolds Bruce A.
Switzer Michael D.
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