Tubular sheathed electric heater with an overheat safety device

Details Tubular sheathed electric heater with an overheat safety device Tubular sheathed electric heater with an overheat safety device

1988-11-30

1991-05-28

Bartis, Anthony

Electric resistance heating devices

Heating devices

Immersion heater details

219512, 219517, 219523, 219544, 337393, 337403, 337416, 392451, 392455, H05B 102, H05B 382, H01H 3732

Patent

active

050201280

ABSTRACT:
A tubular electric resistance heater includes a tubular sheath enclosing an electric heater coil. As protective overheat safety device is provided at an end of the sheath and includes an electrically conductive tube disposed in a cavity in the end of the sheath and having a closed end electrically connected to the heater coil. A rod-shaped member made of a thermally deformable material extends through the tube from the closed and projects out of the other end of the tube into activating engagement with a normally closed switch located externally of the tubular sheath and electrically connected in series with the tube and thereby the heater coil. Excessive heater coil temperatures cause the rod-shaped member to deform and actuate the switch to its open position to deenergize the heater coil. The rod-shaped member may be made to a memory-alloy or a plastic which changes its structure, e.g., shrinks, or melts at a certain temperature.

REFERENCES:
patent: 1582276 (1926-04-01), Kitto
patent: 1689198 (1928-10-01), Gagelman
patent: 2066632 (1937-01-01), Lovekin et al.
patent: 3043937 (1962-07-01), Milton et al.
patent: 3371192 (1968-02-01), Rosenel
patent: 3585359 (1971-06-01), Drugmand
patent: 4075595 (1978-02-01), Plasko
patent: 4384267 (1983-05-01), Aoki
patent: 4390776 (1983-06-01), Yane
patent: 4675642 (1987-06-01), Reiferscheid
patent: 4697069 (1987-09-01), Bleckmann

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