Patent US3673386A successfully refreshed from Google Patents.
US3673386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric immersion heaters
Assignee: Emerson Electric Co
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Filing: 1970-10-19
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Granted: 1972-06-27
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Expires: 1990-10-19
Abstract
Abstract An electric heater construction particularly adapted to have its heating portion submerged in a substance contained in a tank. The heater comprises a terminal box which is disposed above and out of contact with the tank substance and a plurality of tubular members extending downwardly from the terminal box in side-byside manner and immersed in the tank substance, one of said tubular members being adapted to contain a thermal element influenced by the thermal conditions of the tank substance, and the other tubular members containing electric heating elements for heating the tank substance. The tubular elements are held in predetermined side-by-side relationship by a plate which has openings to pass the respective tubular elements, said one tubular element being fixed in its plate opening and the other tubular elements freely passing through their plate openings, whereby to hold the tubular members in predetermined side-by-side relationship while permitting relative longitudinal movement thereof. A conventional sheathed electric heater of hairpin formation may be used for the heating elements, the terminal pins defining cold heater lengths and the plate is fixed to the one tubular element substantially at to the lower end of the heater cold lengths and carries means to indicate a warning concerning a low liquid level in the tank.
Inventors
- 👤 Lester D Drugmand
- 👤 Sidney J Temple
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:40
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/78
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
201 words
An electric heating assembly for heating liquid in an upright tank, comprising a pair of spaced side-by-side elongated tubular members disposed within said tank in upright manner, lower portions of said tubular members being immersed within the liquid within said tank and upper portions being attached to the lower wall of a terminal box, one of said tubular members containing an electric heating element and the other adapted to contain a thermal element influenced by thermal conditions adjacent thereto, means attached to the lower end of said one tubular member for engagement with the bottom wall of said tank to space said lower end therefrom and thereby locate said one tubular member vertically in said tank, the heating portion of the heating element within said one tubular member extending from the lower end thereof upwardly to and terminating substantially at a point in line with a predetermined normal liquid level in said tank, and a plate member disposed transversely of said tubular members and having openings for passing the same, said plate member having a slide fit with said one tubular member and a fixed fit with the other tubular member and being located substantially at said predetermined normal liquid level.
Claim 2
Dependent Claim
201 words
An electric heating assembly for heating liquid in an upright tank, comprising a pair of spaced side-by-side elongated tubular members disposed within said tank in upright manner, lower portions of said tubular members being immersed within the liquid within said tank and upper portions being attached to the lower wall of a terminal box, one of said tubular members containing an electric heating element and the other adapted to contain a thermal element influenced by thermal conditions adjacent thereto, means attached to the lower end of said one tubular member for engagement with the bottom wall of said tank to space said lower end therefrom and thereby locate said one tubular member vertically in said tank, the heating portion of the heating element within said one tubular member extending from the lower end thereof upwardly to and terminating substantially at a point in line with a predetermined normal liquid level in said tank, and a plate member disposed transversely of said tubular members and having openings for passing the same, said plate member having a slide fit with said one tubular member and a fixed fit with the other tubular member and being located substantially at said predetermined normal liquid level.
Claim 3
Dependent Claim
29 words
The construction according to claim 1 wherein said plate member carries means indicative of a warning concerning the a liquid level below predetermined normal liquid level in said tank.
Claim 4
Dependent Claim
264 words
An electric heating assembly for heating liquid in an upright tank, including a conventional sheathed electric heater of hairpin formation providing a pair of legs connected at one end by a bight, said conventional heater having terminal pins extending inwardly of the opposite ends of said legs to connection with the usual resistance wire within the sheath, whereby said terminal pins define a heater cold length throughout their extent, part of the heater legs from said terminal pins to an intermediate heater part being rectilinear and being disposed upright in said tank, and the remainder of said heater legs being bent angularly and being disposed along the bottom wall of said tank, means connected to said remainder of said heater legs and engaging said tank bottom wall to space the same from said bottom wall and thereby locate said heater vertically in said tank, the lower end of the cold heater length in each leg being located substantially at the normal liquid level in the tank, a tubular member supported at one end in said tank in juxtaposed upright relation with the upright part of said heater legs, said tubular member adapted to contain a thermal element influenced by thermal conditions adjacent thereto, and a plate extending crosswise of said tubular member and said upright part of said heater legs and having openings to pass the same, said plate having a slide fit with said upright part of said heater legs and a fixed fit with said tubular member at a level substantially at the lowEr end of the cold length of said legs.
Claim 5
Dependent Claim
264 words
An electric heating assembly for heating liquid in an upright tank, including a conventional sheathed electric heater of hairpin formation providing a pair of legs connected at one end by a bight, said conventional heater having terminal pins extending inwardly of the opposite ends of said legs to connection with the usual resistance wire within the sheath, whereby said terminal pins define a heater cold length throughout their extent, part of the heater legs from said terminal pins to an intermediate heater part being rectilinear and being disposed upright in said tank, and the remainder of said heater legs being bent angularly and being disposed along the bottom wall of said tank, means connected to said remainder of said heater legs and engaging said tank bottom wall to space the same from said bottom wall and thereby locate said heater vertically in said tank, the lower end of the cold heater length in each leg being located substantially at the normal liquid level in the tank, a tubular member supported at one end in said tank in juxtaposed upright relation with the upright part of said heater legs, said tubular member adapted to contain a thermal element influenced by thermal conditions adjacent thereto, and a plate extending crosswise of said tubular member and said upright part of said heater legs and having openings to pass the same, said plate having a slide fit with said upright part of said heater legs and a fixed fit with said tubular member at a level substantially at the lowEr end of the cold length of said legs.
Claim 6
Dependent Claim
26 words
The construction according to claim 3 wherein said plate carries means indicative of a warning concerning a liquid level in said tank below said normal level.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |