US4010351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cartridge heater with improved thermocouple
Assignee: RAMA CORP
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Filing: 1976-03-03
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Granted: 1977-03-01
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Expires: 1996-03-03
Abstract
Abstract A cartridge heater with improved thermocouple comprising a tubular metal sheath with a front end, a metal plug closing the front end, a filler of dielectric material in the sheath rearward of the plug and an elongate resistance wire supported by the filler, said plug having a pair of spaced axially extending through holes, elongate insulating tubes with front and rear ends and engaged in said holes with their front ends spaced predetermined limited distances from the open front ends of the holes, a pair of elongate thermocouple wires with front end portions engaged through the sleeves and projecting forwardly therefrom and rear portions supported in said filler and projecting rearwardly through and from the sheath and metal deposits in the forward position of the holes in the plug in sealing engagement therewith and in heat conducting contact with the thermocouple wires.
Inventors
- 👤 David E. Williams
- 👤 Edwin D. Hoyt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:33
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/40; H05B3/42; H05B3/46; G; G01; G01K; G01K7/00; G01K7/02; G01K7/08; H05B3/78; H05B3/82
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
158 words
A cartridge heater with improved thermocouple comprising a tubular metal sheath with a front end, a metal plug closing the front end, a filler of dielectric material in the sheath rearward of the plug and an elongate resistance wire supported by the filler, said plug having a pair of spaced axially extending through holes, elongate insulating tubes with front and rear ends and engaged in said holes with their front ends spaced predetermined limited distances from the open front ends of the holes, a pair of elonate thermocouple wires with front end portions engaged through the tubes and projecting forwardly therefrom and rear portions supported in said filler and projecting rearwardly through and from the sheath and metal deposits in the forward portions of the holes in the plug in sealing engagement therewith and in heat conducting contact with the thermocouple wires, said metal deposits being fused with the plug in said holes and with said thermocouple wires.
Claim 2
Dependent Claim
158 words
A cartridge heater with improved thermocouple comprising a tubular metal sheath with a front end, a metal plug closing the front end, a filler of dielectric material in the sheath rearward of the plug and an elongate resistance wire supported by the filler, said plug having a pair of spaced axially extending through holes, elongate insulating tubes with front and rear ends and engaged in said holes with their front ends spaced predetermined limited distances from the open front ends of the holes, a pair of elonate thermocouple wires with front end portions engaged through the tubes and projecting forwardly therefrom and rear portions supported in said filler and projecting rearwardly through and from the sheath and metal deposits in the forward portions of the holes in the plug in sealing engagement therewith and in heat conducting contact with the thermocouple wires, said metal deposits being fused with the plug in said holes and with said thermocouple wires.
Claim 3
Dependent Claim
61 words
The structure set forth in claim 1 which further includes an insulating disc of dielectric material in the forward portion of the sheath between said element and front plug, said disc having radially spaced axially extending through openings through which the thermocouple wires are engaged to be supported in predetermined position between the element and the holes in the front plug.
Claim 4
Dependent Claim
29 words
The structure set forth in claim 1 wherein said front plug has a rear portion engaged within the front end portion of the sheath in tight sealed engagement therewith.
Claim 5
Dependent Claim
52 words
The structure set forth in claim 3 wherein the rear end portion of the front plug is relieved to allow for radial inward deformation thereof, said sheath being swaged radially inwardly and said rear end portion of said plug yielding radially inwardly with the sheath to establish a tight uniform seal therebetween.
Claim 6
Dependent Claim
26 words
The structure set forth in claim 3, wherein the forward annular end of the sheath is welded to the adjacent annular portion of the front plug.
Claim 7
Dependent Claim
26 words
The structure set forth in claim 4, wherein the forward annular end of the sheath is welded to the adjacent annular portion of the front plug.
Claim 8
Dependent Claim
61 words
The structure set forth in claim 3 which further includes an insulating disc of dielectric material in the forward portion of the sheath between said element and front plug, said disc having radially spaced axially extending through openings through which the thermocouple wires are engaged to be supported in predetermined position between the element and the holes in the front plug.
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) | 1980-02-29 | 1980-08-30 | 1981-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-29 | 1984-08-30 | 1985-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-29 | 1988-08-30 | 1989-03-01 | $7700.00 | Window Closed / Lapsed |