End seals for electric immersion heating elements

Details End seals for electric immersion heating elements End seals for electric immersion heating elements

1977-06-10

1979-12-11

Bartis, A.

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

29611, 174 77R, 219534, 219541, 219544, 338238, 338274, H05B 382, H01C 103, H02G 1504

Patent

active

041784979

ABSTRACT:
A terminal end seal for a metal-sheathed electric immersion water heating element of a water heating tank includes a plastic sealing plug disposed within a pocket at the end of the sheath in surrounding relationship to the terminal pin and locked in sealing engagement with the sheath by inward deformation of the sheath. An electrically insulative vulcanized fibre washer is disposed in the pocket inwardly of the plug in engagement with the terminal pin and inner surface of the sheath. Without the fibre washer, it would be possible under abnormal conditions for the plastic sealing plug to fail and the sheath portion immersed within the water in the tank to fracture, allowing water to enter the sheath and flow outwardly of the then-open sheath end to cause damage. However, the fibre washer intercepts such water and swells to form a tight seal to restrict flow of water outwardly of the sheath. The inward deformation of the sheath provides a stop to restrict movement of the fibre washer outwardly of the sheath in the event that high water pressure causes the washer to move in the latter direction.

REFERENCES:
patent: 965684 (1910-07-01), Bierce et al.
patent: 2043195 (1936-06-01), Finlayson
patent: 2269194 (1942-01-01), Finlayson
patent: 2703834 (1955-03-01), Charbonneau
patent: 2831951 (1958-04-01), Desloge
patent: 3310769 (1967-03-01), Simmons
patent: 3582616 (1971-06-01), Wrob
patent: 3617614 (1971-11-01), Henry
patent: 3934116 (1976-01-01), Cunningham et al.

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