Patent US3617701A successfully refreshed from Google Patents.
US3617701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric heating elements
Assignee: Emerson Electric Co
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Filing: 1970-04-23
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Granted: 1971-11-02
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Expires: 1990-04-23
Abstract
Abstract An electric heating element within a quartz tube, the latter having a swivel head connected to one end. The heating element comprises a ceramic core on which a resistance wire is wound helically, the core being formed in sections, each section having a helical groove formed thereon for receiving the resistance wire, the core sections being relatively rotatable to align the helical grooves.
Inventors
- 👤 John E Volker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:24
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/78; H05B3/0033; H05B3/009
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
167 words
An immersion heater, comprising a quartz tube adapted to be immersed in a fluid to be heated, the inner end of said tube being closed and the outer end being open, a heating element in said tube, a plastic collar around and cemented to the tube open end, said collar having exterior screw threads and a coaxial conical surface, a plastic conduit member having a conical recess complementary to and interfitting with the collar, conical surface and also having an annular shoulder, such conical surface and shoulder being formed in a portion of said conduit member which is coaxial with said collar, and said conduit member having a portion extending angularly from said coaxial portion, a plastic cap having internal screw threads interfitting with the threads on said collar to draw said cap down on said shoulder and urge the interfitting conical surfaces to tight engagement, said heating element having terminals which extend outwardly of said tube open end and through said collar and said conduit member.
Claim 2
Dependent Claim
167 words
An immersion heater, comprising a quartz tube adapted to be immersed in a fluid to be heated, the inner end of said tube being closed and the outer end being open, a heating element in said tube, a plastic collar around and cemented to the tube open end, said collar having exterior screw threads and a coaxial conical surface, a plastic conduit member having a conical recess complementary to and interfitting with the collar, conical surface and also having an annular shoulder, such conical surface and shoulder being formed in a portion of said conduit member which is coaxial with said collar, and said conduit member having a portion extending angularly from said coaxial portion, a plastic cap having internal screw threads interfitting with the threads on said collar to draw said cap down on said shoulder and urge the interfitting conical surfaces to tight engagement, said heating element having terminals which extend outwardly of said tube open end and through said collar and said conduit member.
Claim 3
Dependent Claim
89 words
The construction of claim 1 wherein said heating element comprises an electric resistance wire wound helically on a ceramic core, the inner end of said core being adjacent the closed end of said quartz tube, said core being formed of a plurality of axially aligned sections, each having a helical groove for receiving said resistance wire, said core sections being relatively rotatable to align the groove in one section with the groove in an adjoining section, and a key member between adjoining sections for holding the same against rotation.
Claim 4
Dependent Claim
109 words
An electric heating element, comprising a ceramic core, an electric resistance wire wound helically on said core, the latter being formed in axially aligned sections, each section having a helical groove for receiving said resistance wire, said core sections being relatively rotatable to helically align the groove in one section with the groove in an adjoining section, adjoining ends of said core sections being formed with a plurality of radially extending slots and a key memBer between said adjoining ends and fitting into respective slots therein which are matched to provide helical alignment of the grooves in said core sections, said key member thereby holding the latter against rotation.
Claim 5
Dependent Claim
109 words
An electric heating element, comprising a ceramic core, an electric resistance wire wound helically on said core, the latter being formed in axially aligned sections, each section having a helical groove for receiving said resistance wire, said core sections being relatively rotatable to helically align the groove in one section with the groove in an adjoining section, adjoining ends of said core sections being formed with a plurality of radially extending slots and a key memBer between said adjoining ends and fitting into respective slots therein which are matched to provide helical alignment of the grooves in said core sections, said key member thereby holding the latter against rotation.
Claim 6
Dependent Claim
88 words
The construction according to claim 3 wherein each core section has a longitudinal central opening, a supporting member extending through the central openings of all core sections, said key member also having a central opening through which said supporting member extends, said core sections being slidable longitudinally on said supporting member to clear said key, whereby said sections may be relatively rotated to align the grooves thereon, the aligned core sections being movable toward each other to engage said key member in matched slots in said core ends.
Claim 7
Dependent Claim
31 words
The construction according to claim 4, wherein said supporting member is in the form of a rodlike member having heads at opposite ends to hold said core sections against longitudinal separation.
Claim 8
Dependent Claim
166 words
An immersion heater, comprising a tube having an open end, an electric heating element in said tube, a tubular collar having a portion encompassing and secured to said tube open end and a conical portion extending from said tube open end, a conduit member having an internal conical surface mating with said collar conical portion, said conduit member being elongated so that its other end is disposed an appreciable distance from said collar, and a cap nut encompassing said conduit member and said collar in the vicinity of said mating conical portion and conical surface, said cap nut having a cap portion bearing against said conduit member and a skirt portion threaded on threads on the exterior of said collar, said cap nut being adapted to draw said mating conical portion and conical surface in tight interengagement, said heating element having terminals which extend outwardly of said tube open end, through said collar and said conduit, and outwardly of said other end of said conduit member.
Claim 9
Dependent Claim
166 words
An immersion heater, comprising a tube having an open end, an electric heating element in said tube, a tubular collar having a portion encompassing and secured to said tube open end and a conical portion extending from said tube open end, a conduit member having an internal conical surface mating with said collar conical portion, said conduit member being elongated so that its other end is disposed an appreciable distance from said collar, and a cap nut encompassing said conduit member and said collar in the vicinity of said mating conical portion and conical surface, said cap nut having a cap portion bearing against said conduit member and a skirt portion threaded on threads on the exterior of said collar, said cap nut being adapted to draw said mating conical portion and conical surface in tight interengagement, said heating element having terminals which extend outwardly of said tube open end, through said collar and said conduit, and outwardly of said other end of said conduit member.
Claim 10
Dependent Claim
54 words
The construction according to claim 6 and further including a horizontal support plate for the immersion heater, said plate having an opening through which said tube and collar freely extend in vertical manner, the free end of the cap nut skirt bearing against the upper surface of said support plate to suspend said heater.
Claim 11
Dependent Claim
38 words
The construction according to claim 6 wherein said tube is formed of quartz and said collar, conduit member and cap nut are formed of dielectric material which will resist the corrosive action of fluids heated by said heater.
Claim 12
Dependent Claim
63 words
The construction according to claim 6 wherein the opposite end of said tube is closed, and wherein said electric heating element comprises a resistance wire wound on an elongated ceramic core, said heating element being disposed within said tube with said resistance wire spaced from the interior surface of said tube, said core having an end abutting the closed end of said tube.
Claim 13
Dependent Claim
33 words
The construction according to claim 9 wherein insulating material is disposed within said tube at its closed end, said insulating material having a recess for receiving said core end to center such end.
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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |