US3778592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric heating assemblies
Assignee: Emerson Electric Co
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Filing: 1972-11-16
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Granted: 1973-12-11
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Expires: 1992-11-16
Abstract
Abstract The invention relates particularly to an electric immersion heater for use in heating liquid in a tank, such as a hot water tank. The heater includes the standard construction of a mounting flange and a sheathed heating element rigidly carried by the flange in cantilever fashion so that it may be positioned through a tank opening and in contact with the liquid to be heated. A corrosion shield overlies the flange surface which is exposed to the liquid in the tank, the shield having a collar through which an end of the heater sheath passes, such end also passing through an opening in the mounting flange. The collar is deformed radially inwardly against the wall surface of the sheath, the deformation causing the wall of the collar to be reduced in cross-section and substantially cold welded to the sheath to form a liquid-tight joint therewith. The flange is staked to the sheath to provide a mechanically rigid joint therebetween. A dielectric terminal block is rigidly connected to the mounting flange and has a pocket in which an end seal bushing at the sheath end is compressed.
Inventors
- 👤 M Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:13
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/02; H05B3/06; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49925; Y10T29/49927
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
167 words
An electric heating assembly, comprising: an electric heating element having a tubular metallic sheath, a resistor within said sheath, material within said sheath for electrically insulating said resistor from said sheath and for conducting heat from said resistor to said sheath, and a terminal pin connected to said resistor and extending outwardly of an end of said sheath, a metallic mounting flange having an opening through which said sheath end passes from one side surface to another, the defining wall of said opening closely fitting around the adjoining peripheral surface of said sheath end, a non-ferrous sheet metal plate overlying said one side surface to protect the same, said plate having an opening margined by an integral collar extending therefrom in a direction away from said mounting flange one side surface, and said sheath end passing through said late opening and through said collar in close fitting relation, said collar being deformed radially inwardly against the periphery of said sheath end to form a liquid-tight joint therewith.
Claim 2
Dependent Claim
167 words
An electric heating assembly, comprising: an electric heating element having a tubular metallic sheath, a resistor within said sheath, material within said sheath for electrically insulating said resistor from said sheath and for conducting heat from said resistor to said sheath, and a terminal pin connected to said resistor and extending outwardly of an end of said sheath, a metallic mounting flange having an opening through which said sheath end passes from one side surface to another, the defining wall of said opening closely fitting around the adjoining peripheral surface of said sheath end, a non-ferrous sheet metal plate overlying said one side surface to protect the same, said plate having an opening margined by an integral collar extending therefrom in a direction away from said mounting flange one side surface, and said sheath end passing through said late opening and through said collar in close fitting relation, said collar being deformed radially inwardly against the periphery of said sheath end to form a liquid-tight joint therewith.
Claim 3
Dependent Claim
64 words
The construction according to claiM 1 wherein said heating element is of the hair-pin type having a bight and a pair of legs, said mounting flange having a pair of openings to pass the sheath legs, said metal plate having a pair of openings, each margined by a collar, and each collar being deformed radially inwardly against the periphery of a respective sheath leg.
Claim 4
Dependent Claim
29 words
The construction according to claim 1 wherein the metal of said flange is deformed inwardly against the periphery of said sheath end to provide a mechanically rigid joint therebetween.
Claim 5
Dependent Claim
51 words
The construction according to claim 1 wherein a dielectric terminal block overlies the other side surface of said mounting flange and has an opening of a size to receive said sheath end and a coaxial reduced opening to pass said terminal pin, and means connecting said terminal block to said flange.
Claim 6
Dependent Claim
128 words
The construction according to claim 1 wherein a compressible bushing is held with said sheath end and has a portion extending therebeyond, and wherein a terminal block has an opening extending from one side surface to the other, said one side surface of said block abutting said other side surface of said mounting flange and said block opening at said block one side surface being of a size to receive said sheath end and to form a shoulder with a reduced portion of said block opening, the extending end of said bushing being compressed against said shoulder, said terminal pin passing through the reduced portion of said block opening and headed over said other side surface of said terminal block to hold the latter assembled with said flange.
Claim 7
Dependent Claim
28 words
The construction according to claim 5 wherein the metal of said flange is deformed inwardly against the periphery of said sheath to provide a mechanically rigid joint therebetween.
Claim 8
Dependent Claim
38 words
The construction according to claim 1 wherein the inward deformation of said collar causes a reduction in the wall thickness of said collar and substantially effects a cold weld between the metals of said collar and said sheath.
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |