US3852568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric resistance heating element
Assignee: EHD Inc
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Filing: 1973-02-01
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Granted: 1974-12-03
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Expires: 1993-02-01
Abstract
Abstract A resistance heating assembly in which the heating element is a thin strip of apertured, foil-like material formed with a series of corrugations which establish a wavy or serpentine pattern. The heating element is supported by tubular insulators carried by a wire framework and located at the points of direction reversal of the serpentine pattern. The insulators are supported on wire members each having one end secured to the wire framework and a free end extending into a tubular insulator. The tubular insulators are secured against axial movement on the wire members but are rotatable relative thereto, whereby localized expansion and contraction of the strip is distributed over the entire length of the strip.
Inventors
- 👤 J Clement
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:10
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/20; H05B3/22; H05B3/32
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
135 words
A resistance heating assembly comprising: a. a support framework; b. a plurality of tubular insulators supported on said framework and located at the points of direction reversal of a serpentine path; c. means coacting between the framework and each insulator for supporting said insulators in axially fixed relation; wherein the framework includes elongated wire member means and the insulator support means include a plurality of wire members each having one portion secured to said elongated wire member means and having a free end extending into a tubular insulator; d. a thin strip of apertured, foil-like electrical resistance material retained and supported by said insulators at intervals along the length of said strip, said strip being formed as a grid along a serpentine path; and e. electric terminal means communicating with each extremity of said strip.
Claim 2
Dependent Claim
135 words
A resistance heating assembly comprising: a. a support framework; b. a plurality of tubular insulators supported on said framework and located at the points of direction reversal of a serpentine path; c. means coacting between the framework and each insulator for supporting said insulators in axially fixed relation; wherein the framework includes elongated wire member means and the insulator support means include a plurality of wire members each having one portion secured to said elongated wire member means and having a free end extending into a tubular insulator; d. a thin strip of apertured, foil-like electrical resistance material retained and supported by said insulators at intervals along the length of said strip, said strip being formed as a grid along a serpentine path; and e. electric terminal means communicating with each extremity of said strip.
Claim 3
Dependent Claim
16 words
A resistance heating assembly in accordance with claim 1 wherein the tubular insulators are rotatably supported.
Claim 4
Dependent Claim
14 words
A resistance heating assembly in accordance with claim 1 wherein the insulators are ceramic.
Claim 5
Dependent Claim
36 words
A resistance heating assembly in accordance with claim 1 wherein the said plurality of wire members of the insulator support means comprises a plurality of U-shaped wire members secured to said framework at uniformly spaced intervals.
Claim 6
Dependent Claim
58 words
A resistance heating assembly in accordance with claim 1 wherein the said plurality of wire members of the insulator support means comprises a plurality of U-shaped wire members welded at their respective bases to said wire member and having their free arms lying in planes obliquely disposed relative to said wire member and extending into said tubular insulators.
Claim 7
Dependent Claim
28 words
A resistance heating assembly in accordance with claim 1 wherein the elongated wire member means comprises a pair of parallel rectangular frames and means for spacing said frames.
Claim 8
Dependent Claim
21 words
A resistance heating assembly in accordance with claim 6 wherein the insulators are rotatably supported on said plurality of wire members.
Claim 9
Dependent Claim
38 words
A resistance element in accordance with claim 7 in which the plurality of wire members consists of pairs of axially aligned rod members each secured to a different one of said rectangular frames and extending toward one another.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |