Patent US3676640A successfully refreshed from Google Patents.
US3676640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arc welding gun
Assignee: Delaware Capital Formation Inc
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Filing: 1969-06-05
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Granted: 1972-07-11
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Expires: 1989-06-05
Abstract
Abstract A high current capacity arc welding gun for gas-shielded, continuous feed, consumable electrode arc welding processes. Features include: a unique handle cooled by convection air flow; an improved head assembly having a unique electrical insulating ion impervious shield for preventing destructive arcing to the gas nozzle, an improved shielding gas flow path through the head assembly which additionally cooperates with the ion impervious shield to prevent gas nozzle arcing, a unique current contact tip which attaches to the head assembly by a novel curved wedge clamping concept and which is produced by an improved, versatile, and inexpensive method of manufacture that increases the copper density and refines the grain structure in the current contact tip for greater life; an improved gooseneck lining for longer life and reduced friction; a heat protected control switch assembly of rugged construction and unique trigger operation; and an improved welding cable connection assembly.
Inventors
- 👤 Arthur A Bernard
- 👤 Richard A Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:50
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/24; B23K9/28; B23K9/29; B23K9/291; B23K9/295
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
357 words
An arc welding gun having means for receiving and applying shielding gas, welding current, and a continuous-feed consumable electrode to a welding operation, wherein the improvement comprises: a tubular, electrically conductive main trunk having a central bore for conducting both said shielding gas and said consumable electrode through said arc welding gun, said main trunk comprising a rigid one-piece tubular member forming the principal structural element of said arc welding gun and being electrically conductive for the conduction of said welding current through said arc welding gun; a head assembly mounted on one end of said main trunk for directing said consumable electrode and said shielding gas to said welding operation and for establishing electrical contact with said consumable electrode; a handle mounted on the opposite end of said main trunk spaced from said head assembly and having a bore extending longitudinally through the entire length of said handle, said handle bore being telescoped over a portion of the length of said main trunk; spacer means mounting said tubular handle to said main trunk and radially spacing the interior surface of said handle bore from the exterior surface of said main trunk, said handle bore having a cross-sectional area substantially larger than the cross-sectional area of said main trunk and providing a longitudinally-extending convective duct open at each end for convecting a flow of cooling amBient air through said handle bore during operation of said arc welding gun; a gas hose connecting means extending within said handle bore and communicating with said main trunk bore for conducting shielding gas to said main trunk bore; connection means at the rearward end of said main trunk for mechanically connecting said main trunk to a welding cable for conducting said consumable electrode into said main trunk bore from the welding cable and for electrically connecting said main trunk to the welding cable; a rigid housing mounted on the exterior of said tubular handle and including at least one opening through which heated air may egress; a control switch mounted within the interior of said rigid housing; and a trigger member projecting from said rigid housing for actuating said control switch.
Claim 2
Dependent Claim
357 words
An arc welding gun having means for receiving and applying shielding gas, welding current, and a continuous-feed consumable electrode to a welding operation, wherein the improvement comprises: a tubular, electrically conductive main trunk having a central bore for conducting both said shielding gas and said consumable electrode through said arc welding gun, said main trunk comprising a rigid one-piece tubular member forming the principal structural element of said arc welding gun and being electrically conductive for the conduction of said welding current through said arc welding gun; a head assembly mounted on one end of said main trunk for directing said consumable electrode and said shielding gas to said welding operation and for establishing electrical contact with said consumable electrode; a handle mounted on the opposite end of said main trunk spaced from said head assembly and having a bore extending longitudinally through the entire length of said handle, said handle bore being telescoped over a portion of the length of said main trunk; spacer means mounting said tubular handle to said main trunk and radially spacing the interior surface of said handle bore from the exterior surface of said main trunk, said handle bore having a cross-sectional area substantially larger than the cross-sectional area of said main trunk and providing a longitudinally-extending convective duct open at each end for convecting a flow of cooling amBient air through said handle bore during operation of said arc welding gun; a gas hose connecting means extending within said handle bore and communicating with said main trunk bore for conducting shielding gas to said main trunk bore; connection means at the rearward end of said main trunk for mechanically connecting said main trunk to a welding cable for conducting said consumable electrode into said main trunk bore from the welding cable and for electrically connecting said main trunk to the welding cable; a rigid housing mounted on the exterior of said tubular handle and including at least one opening through which heated air may egress; a control switch mounted within the interior of said rigid housing; and a trigger member projecting from said rigid housing for actuating said control switch.
Claim 3
Dependent Claim
38 words
The arc welding gun defined in claim 1 wherein said longitudinal bore of said handle has a cross-sectional diameter which is at least 1 1/3 times the outside diameter of the portion of said main trunk telescoped therein.
Claim 4
Dependent Claim
300 words
The arc welding gun defined in claim 1 wherein said head assembly comprises: a generally cylindrical electrically conductive head member attached to the forward end of said main trunk in firm electrical connection therewith, said head member having a central longitudinal bore extending therethrough for receiving said continuous electrode and said shielding gas from said main trunk, said head member having a large diameter rearward portion and a reduced diameter forward portion; an electrically conductive generally cylindrical current contact member having a rearward portion of its length telescoped within a forward portion of the length of said head member bore and detachably secured therein in firm electrical connection with said head member, said current contact member having a central longitudinal bore for passage of said consumable electrode therethrough; a unitary tubular shield member of electrically insulating, ion-impervious material telescoped over and secured to said large diameter rearward portion of said head member and extending therefrom to a point forwardly of said large diameter portion of said head member forming an annular cavity with said reduced diameter forward portion of said head member; a gas nozzle telescoped over and secured to said tubular shield member and extending forwardly from a point short of the rearward end of said tubular shield member to beyond the forward end of said tubular shield member, said head member having an annularly arranged plurality of ports extending from said head member bore to said annular cavity for directing the flow of shielding gas into said annular cavity for flow in an annular stream through the space separating forward exposed exterior surfaces of said head member, said current contact member, and the consumable electrode from the forward exposed interior surface of said gas nozzle to purge said space to reduce the density of ions in said space.
Claim 5
Dependent Claim
171 words
The improvement defined in claim 3 wherein said rearward portion of said current contact member is provided with an annularly oriented, eccentric cam surface and wherein said head member is provided with an element projecting into said head member bore, the portion of the head member bore into which said rearward portion of said current contact member is received and into which said element projects being of substantially larger diameter than the outside diameter of said current contact member such that said rearward portion of said current contact member is unsupported on its side diametric from the point of coaction with said projecting element so as to provide substantially three force contact points along said current contact member and slight flexure of said rearward portion of said current contact member when said current contact member is rotated into binding engagement with said projecting element, said region of enlarged diameter of said head member bore also forming a pressure chamber for reception of shielding gas and distribution through said anNularly arranged ports.
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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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |