Patent US3749883A successfully refreshed from Google Patents.
US3749883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric heater assembly
Assignee: Emerson Electric Co
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Filing: 1972-07-17
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Granted: 1973-07-31
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Expires: 1992-07-17
Abstract
Abstract A heater assembly for use with a stove having a flat top surface. The assembly includes a base molded of integrated inorganic refractory material having opposed flat sides, the upper side being adapted to be pressed against the underside of the flat top surface. The base upper side has a recess for receiving a tubular electric heating element which is shaped to a flat spiral. A support member is formed of strip metal positioned on edge and bent to provide a pair of legs connected by a bight portion. The support member is disposed within the base recess to support the heating element and the combined thickness of the support member and the flat spiral is less than the depth of the recess so that the flat spiral is spaced from the underside of the flat top surface. The support member is devoid of any mechanical connection with the flat spiral and the base, and a single hook member is engaged over a portion of a spiral convolution and has a shank extending through a vertical opening in the base, the end of the shank being threaded to receive a nut to draw the hook member against the convolution portion and thus draw the flat spiral against the support member and the latter against the bottom of the heater.
Inventors
- 👤 R Vodvarka
- 👤 L Kozbelt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:02
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/68; H05B3/76
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
149 words
A heating assembly for use with a stove having a flat top surface comprising a base of insulating material, a flat sheathed electric heating element, said base having a recess extending inwardly from a plane side face and of a transverse size to freely pass the marginal portion of said heating element and to receive the latter in a flatwise manner, said plane side face being adapted to be pressed against the undersurface of said flat top surface, support means between the undersurface of said heating element and the bottom of said recess for supporting said heating element, the combined thickness of said support means and said heating element being less than the depth of said recess so that the upper surface of said heating element is disposed below the plane of said base side, and engaging means securing said heating element and support means to said insulating base.
Claim 2
Dependent Claim
149 words
A heating assembly for use with a stove having a flat top surface comprising a base of insulating material, a flat sheathed electric heating element, said base having a recess extending inwardly from a plane side face and of a transverse size to freely pass the marginal portion of said heating element and to receive the latter in a flatwise manner, said plane side face being adapted to be pressed against the undersurface of said flat top surface, support means between the undersurface of said heating element and the bottom of said recess for supporting said heating element, the combined thickness of said support means and said heating element being less than the depth of said recess so that the upper surface of said heating element is disposed below the plane of said base side, and engaging means securing said heating element and support means to said insulating base.
Claim 3
Dependent Claim
16 words
The construction according to claim 1 wherein said base is molded of integrated inorganic refractory material.
Claim 4
Dependent Claim
42 words
The construction according to claim 1 wherein said heating element is tubular and shaped to a flat spiral, with terminal ends extending downwardly from said spiral and through respective vertical openings in said base for connection to a source of electrical energy.
Claim 5
Dependent Claim
84 words
The construction according to claim 3 wherein said support means is devoid of mechanical connection with said heating element and said base, and further said engaging means including a hook member engaging over a portion of a convolution of said flat spiral and having a shank extending through a vertical opening in said base, and means to draw said hook member against said convolution portion and thus draw said heating element against said support means and the latter against the bottom of said recess.
Claim 6
Dependent Claim
46 words
The construction according to claim 4 wherein said support means is formed of strip metal positioned on edge and bent to provide a pair of legs connected by a bight portion, each of said legs underlying and bearing against at least certain of the spiral convolutions.
Claim 7
Dependent Claim
51 words
The construction according to claim 5 wherein at least one of said legs underlies said convolutions in chord-like relation, and further including a temperature sensing element having an elongated outer tube disposed alongside said one leg and having its opposite ends extending through openings in the side wall of said recess.
Claim 8
Dependent Claim
140 words
A heating assembly for use with a stove having a flat top surface, comprising a base formed of molded integrated refractory material, an electric heating element having a metal sheath shaped to a flat spiral, said base having a recess extending inwardly from a plane side face and of a transverse size to freely pass the marginal portion of said flat spiral and to receive the latter in flatwise manner, said plane side face being adapted to be disposed flatwise adjacent to the underside of said fLat top surface, a support member formed of strip metal positioned on edge, the lower edge of said support member resting on the bottom of said recess and said heating element resting on the upper edge of said support member and engaging means securing said heating element and support means to said refractory base.
Claim 9
Dependent Claim
140 words
A heating assembly for use with a stove having a flat top surface, comprising a base formed of molded integrated refractory material, an electric heating element having a metal sheath shaped to a flat spiral, said base having a recess extending inwardly from a plane side face and of a transverse size to freely pass the marginal portion of said flat spiral and to receive the latter in flatwise manner, said plane side face being adapted to be disposed flatwise adjacent to the underside of said fLat top surface, a support member formed of strip metal positioned on edge, the lower edge of said support member resting on the bottom of said recess and said heating element resting on the upper edge of said support member and engaging means securing said heating element and support means to said refractory base.
Claim 10
Dependent Claim
83 words
The construction according to claim 7 wherein said support member is devoid of mechanical connection with said heating element and said base, and further said engaging means including a hook member engaging over a portion of a convolution of said flat spiral and having a shank extending through a vertical opening in said base, and means to draw said hook member against said convolution and thus draw said heating element against said support member and the latter against the bottom of said recess.
Claim 11
Dependent Claim
50 words
The construction according to claim 8 wherein a flat metal plate underlies and engages that side face of said base which is opposite said plane side face, said metal plate having an opening to pass the shank of said hook member, and said shank being threaded to receive a nut.
Claim 12
Dependent Claim
38 words
The construction according to claim 7 wherein said support member is bent to provide a pair of legs connected by a bight portion, each of said legs underlying and bearing against at least certain of the spiral convolutions.
Claim 13
Dependent Claim
51 words
The construction according to claim 10 wherein at least one of said legs underlies said convolutions in chord-like relation, and further including a temperature sensing element having an elongated outer tube disposed alongside said one leg and having its opposite ends extending through openings in the side wall of said recess.
Claim 14
Dependent Claim
24 words
The construction according to claim 9 and further including a conductor connected to said flat metal plate and adapted to be connected to ground.
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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) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |