US3868489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistance welder
Assignee: Duracell Inc USA
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Filing: 1973-11-09
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Granted: 1975-02-25
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Expires: 1993-11-09
Abstract
Abstract A resistance welding apparatus utilizes a force-equalizing means including three universal ball joints to provide an equal force distribution to two welding electrodes.
Inventors
- 👤 Clifton E Ayers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:40
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/30; B23K11/31; B23K11/318; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32008; Y10T403/32032; Y10T403/32606; Y10T403/32861; Y10T403/32918
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
121 words
In an electric resistance welding apparatus of the type having a housing, two shanks axially movable along guides in said housing, welding electrodes connected to said shanks, and drive means for axially moving said shanks to advance said electrodes into contact with workpieces to be welded, the improvement which includes a universal force-equalizing means for dividing a force exerted by said drive means into two equal forces exerted on said shanks comprising a. three ball joints; b. a ball shaft passing through said ball joints, and c. retention means retaining said ball joints on said ball shaft; d. the centermost of said ball joints coupled to said drive means, and the outermost two of said ball housings connected to said shanks.
Claim 2
Dependent Claim
121 words
In an electric resistance welding apparatus of the type having a housing, two shanks axially movable along guides in said housing, welding electrodes connected to said shanks, and drive means for axially moving said shanks to advance said electrodes into contact with workpieces to be welded, the improvement which includes a universal force-equalizing means for dividing a force exerted by said drive means into two equal forces exerted on said shanks comprising a. three ball joints; b. a ball shaft passing through said ball joints, and c. retention means retaining said ball joints on said ball shaft; d. the centermost of said ball joints coupled to said drive means, and the outermost two of said ball housings connected to said shanks.
Claim 3
Dependent Claim
26 words
The electric resistance welding apparatus as recited in claim 1 further including a force adjustment means connected between said universal force-equalizing means and said drive means.
Claim 4
Dependent Claim
43 words
The electric resistance welding apparatus as recited in claim 2 wherein said force adjustment means comprises a helical compression spring carried about a plunger and a compression adjuster nut threaded to a threaded portion of said plunger and engaging said helical compression spring.
Claim 5
Dependent Claim
36 words
The electric resistance welding apparatus as recited in claim 1 wherein said retention means comprises a head on one end of said ball shaft and a nut threaded onto the other end of said ball shaft.
Claim 6
Dependent Claim
34 words
The electric resistance welding apparatus as recited in claim 4 wherein pivotal centers of said outermost two ball joints on said ball shaft are equidistant to a pivotal center of said centermost ball joint.
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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |