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US3728514A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermionic insulated arc welding gun
Assignee: Delaware Capital Formation Inc
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Filing: 1970-12-21
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Granted: 1973-04-17
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Expires: 1990-12-21
Abstract
Abstract Improved means of insulating that portion of an air cooled arc welding gun which extends between the handle portion and the head portion to prevent thermionic emission dense enough to establish the conductance of welding current between it and the weldment, improved means for enclosing the welding current circuit suspended within the handle of the gun within a tube composed of insulating material to reduce the amount of heat radiated from the circuit within the handle, and improved means for suspending a highly heated welding current circuit within the handle to provide space between the wall of the handle bore and the suspended heated circuit for the circulation of cooling air therethrough. Also disclosed is the method of making the improved structure.
Inventors
- 👤 A Bernard
- 👤 R Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:02
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/24; B23K9/28; B23K9/29; B23K9/291; B23K9/295
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
264 words
In an arc welding gun for feeding continuous lengths of consumable electrode in an arc welding process and which includes a handle member having a bore through its total length, the combination therewith comprising: a main tubular trunk for conducting welding current through its wall and consumable electrode through its bore to a head assembly of the arc welding gun, said main tubular trunk having means at a downstream end connecting said main trunk to the head assembly of the arc welding gun, said main tubular trunk extending into the bore of said handle member and having means at an upstream end thereof connecting said main trunk to a welding cable, said main trunk comprising an inner electrically conductive metal tubular member encased within a snug-fitting second tube of unitary electrical insulating and substantially ion-impervious material, said second tube being encased within a third snug-fitting tube of thin gauge metal: and means suspending the portion of said main tubular trunk extending into the bore of said handle member to provide a space between the wall of the bore of said handle member and the outer periphery of said third tube of said main trunk for the circulation of cooling air through the bore of said handle member said suspending means comprising, one or more collars through which said main trunk is telescoped, each of said collars being rigidly attached to the outer periphery of said third tube of said main trunk and having outwardly extending projections spacing said collar centrally within the bore of said handle member and attaching said collar to said handle.
Claim 2
Dependent Claim
264 words
In an arc welding gun for feeding continuous lengths of consumable electrode in an arc welding process and which includes a handle member having a bore through its total length, the combination therewith comprising: a main tubular trunk for conducting welding current through its wall and consumable electrode through its bore to a head assembly of the arc welding gun, said main tubular trunk having means at a downstream end connecting said main trunk to the head assembly of the arc welding gun, said main tubular trunk extending into the bore of said handle member and having means at an upstream end thereof connecting said main trunk to a welding cable, said main trunk comprising an inner electrically conductive metal tubular member encased within a snug-fitting second tube of unitary electrical insulating and substantially ion-impervious material, said second tube being encased within a third snug-fitting tube of thin gauge metal: and means suspending the portion of said main tubular trunk extending into the bore of said handle member to provide a space between the wall of the bore of said handle member and the outer periphery of said third tube of said main trunk for the circulation of cooling air through the bore of said handle member said suspending means comprising, one or more collars through which said main trunk is telescoped, each of said collars being rigidly attached to the outer periphery of said third tube of said main trunk and having outwardly extending projections spacing said collar centrally within the bore of said handle member and attaching said collar to said handle.
Claim 3
Dependent Claim
247 words
In an arc welding gun for feeding continuous lengths of consumable electrode in an arc welding process and which includes a handle member having a bore through its total length, a main tubular trunk for conducting welding current through its wall and the consumable electrode through its bore to a head assembly of the arc welding gun and having a curved midportion and a straight section at an upstream end thereof, an electrically conductive fitting at the upstream end of the main trunk for connection to a welding cable, and means coupling a downstream end of said main trunk to the head assembly of the arc welding gun, the combination therewith of improved means for suspending said straight section at the upstream end of said main trunk within the bore of said handle to enable the circulation of air through said handle bore and around said main trunk comprising: one or more collars through which said main trunk is telescoped and within which said main trunk is rigidly clamped, each of said collars having outwardly extending projections for spacing said collar centrally within said handle bore and attaching said collar to said handle, and an improved main trunk comprising for at least the portion of its length between said head assembly and said collars: an inner metal tubular member encased within a snug-fitted second tube of unitary electrical insulating and substantially ion-impervious material, said second tube being encased within a third snug-fitting tube of thin gauge metal.
Claim 4
Dependent Claim
247 words
In an arc welding gun for feeding continuous lengths of consumable electrode in an arc welding process and which includes a handle member having a bore through its total length, a main tubular trunk for conducting welding current through its wall and the consumable electrode through its bore to a head assembly of the arc welding gun and having a curved midportion and a straight section at an upstream end thereof, an electrically conductive fitting at the upstream end of the main trunk for connection to a welding cable, and means coupling a downstream end of said main trunk to the head assembly of the arc welding gun, the combination therewith of improved means for suspending said straight section at the upstream end of said main trunk within the bore of said handle to enable the circulation of air through said handle bore and around said main trunk comprising: one or more collars through which said main trunk is telescoped and within which said main trunk is rigidly clamped, each of said collars having outwardly extending projections for spacing said collar centrally within said handle bore and attaching said collar to said handle, and an improved main trunk comprising for at least the portion of its length between said head assembly and said collars: an inner metal tubular member encased within a snug-fitted second tube of unitary electrical insulating and substantially ion-impervious material, said second tube being encased within a third snug-fitting tube of thin gauge metal.
Claim 5
Dependent Claim
44 words
The invention defined in claim 2 wherein said outwardly-extending projections are internally threaded for receiving screws attaching said collar to said handle and wherein said collar further includes an internally-threaded boss for receiving a set screw rigidly clamping said collar to said main trunk.
Claim 6
Dependent Claim
24 words
The invention defined in claim 2 wherein the said third tube of thin gauge metal contains a plurality of perforations along its exposed periphery.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |