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US3689732A
Expired / Lapsed
US
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Electric arc working torch
Assignee: L-Tec Co
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Filing: 1970-09-09
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Granted: 1972-09-05
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Expires: 1990-09-09
Abstract
Abstract A front design for electric arc working torches featuring at least one sleeve of electrically insulating material surrounding the torch body and insulating such body from the nozzle, and a clamp and nozzle arrangement such that upon heating of such member they are brought into tighter contact increasing heat transfer thereacross.
Inventors
- 👤 Clifford Warren Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:31
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/24; B23K9/28; B23K9/29; B23K9/291
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
83 words
A gas shielded electric arc working torch comprising an electrically conductive torch body having a heat sink therein; at least one sleeve of electrically insulating material surrounding said torch body and in intimate contact therewith, said electrically insulating material having a thermal conductivity of at least 0.005 watts/in2/*F./in. from 70*F. to 400*F.; a slotted threadless nozzle mounted on said sleeve; and clamping means securing said nozzle to said sleeve whereby said nozzle and said sleeve can be tightened to ensure intimate contact therebetween.
Claim 2
Dependent Claim
83 words
A gas shielded electric arc working torch comprising an electrically conductive torch body having a heat sink therein; at least one sleeve of electrically insulating material surrounding said torch body and in intimate contact therewith, said electrically insulating material having a thermal conductivity of at least 0.005 watts/in2/*F./in. from 70*F. to 400*F.; a slotted threadless nozzle mounted on said sleeve; and clamping means securing said nozzle to said sleeve whereby said nozzle and said sleeve can be tightened to ensure intimate contact therebetween.
Claim 3
Dependent Claim
21 words
Torch according to claim 1 wherein said sleeve is slotted to ensure intimate contact between said torch body and said sleeve.
Claim 4
Dependent Claim
37 words
Torch according to claim 1 wherein said sleeve is approximately two inches long and covers approximately 57 percent of the inside surface of said nozzle that would receive direct radiant heat from the arc and weld puddle.
Claim 5
Dependent Claim
16 words
Torch accorDing to claim 1 wherein said sleeve is made of aluminum with an anodized coating.
Claim 6
Dependent Claim
10 words
Torch according to claim 1 wherein two sleeves are used.
Claim 7
Dependent Claim
37 words
Torch according to claim 5 wherein each sleeve has a wall thickness of approximately 0.020 + or - 0.0015 and an anodized coating in each surface of each sleeve of approximately 0.003 + or - 0.001 thick.
Claim 8
Dependent Claim
24 words
A torch according to claim 1 wherein a contact tip is connected in said torch body for the passage of a consumable electrode therethrough.
Claim 9
Dependent Claim
22 words
A torch according to claim 1 wherein said clamping means have a lower coefficient of thermal expansion than said slotted threadless nozzle.
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |