US3715558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Welding apparatus
Assignee: Gillette Co LLC
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Filing: 1970-09-29
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Granted: 1973-02-06
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Expires: 1990-09-29
Abstract
Abstract Welding sheets of 0.0015 inch thick stainless steel razor blade stock together by overlapping two ends of two sheets 0.0040 inch, inserting the overlapped ends between the peripheral welding surfaces of two adjacent copper-tungsten alloy welding rollers, forming a spot weld under pressure by applying a 1,000 ampere, 60 cycle current at 3.8 volts to the rollers for 8 cycles, advancing the overlap longitudinally between the rollers for a distance about one-third the average length of the spot weld, stopping this advance and forming a second spot weld, and repeating this process until the entire overlap is welded.
Inventors
- 👤 T Mcgill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:41
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/10; B23K11/105
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
362 words
Apparatus for welding together a narrow, elongated overlap formed by the overlapping ends of two thin metal sheets comprising support structure for supporting said sheets including two adjacent planar support platens secured to a base, and spaced from each other, each said platen including means for maintaining said metal sheet flush upon the platen surface, a first rotatable lower welding roller secured beneath said platens for contacting, along its circumference, the underside of said overlap, a second rotatable upper welding roller aligned with said first roller and secured above said overlap, means for moving said second roller down into contact with the upper side of said overlap and maintaining said overlap under pressure between said rollers, overlap establishing structure for moving one platen towards the welding rollers and the other platen, said overlap establishing structure including at least one lever arm on the forward and rearward sides of said one platen, each arm secured to said base, and means for pivoting said one platen on said lever arms to move said one platen toward said other platen, said lever arms being positioned to allow said one platen to lie flush with said base in positions on either side of an unstable center position, and tO lift said platen off said base in passing through said unstable center position, whereby the ends of said metal strips on said platens may be overlapped by movement of said one platen toward said other platen, platen drive structure for moving said platens in the direction of elongation of said overlap to advance said overlap between said rollers, means for moving said welding rollers into engagement with the metal strips to be welded, means for applying welding current to said welding rollers while said rollers are in engagement with the metal strips, and indexing means for intermittently moving said platens an incremental distance to advance said overlap between said rollers while simultaneously preventing welding current flow through said welding rollers, said incremental distance being less than one half the average diameter of a spot weld formed by said overlap, and for intermittently ceasing movement of said support structure and allowing welding current flow through said welding rollers.
Claim 2
Dependent Claim
362 words
Apparatus for welding together a narrow, elongated overlap formed by the overlapping ends of two thin metal sheets comprising support structure for supporting said sheets including two adjacent planar support platens secured to a base, and spaced from each other, each said platen including means for maintaining said metal sheet flush upon the platen surface, a first rotatable lower welding roller secured beneath said platens for contacting, along its circumference, the underside of said overlap, a second rotatable upper welding roller aligned with said first roller and secured above said overlap, means for moving said second roller down into contact with the upper side of said overlap and maintaining said overlap under pressure between said rollers, overlap establishing structure for moving one platen towards the welding rollers and the other platen, said overlap establishing structure including at least one lever arm on the forward and rearward sides of said one platen, each arm secured to said base, and means for pivoting said one platen on said lever arms to move said one platen toward said other platen, said lever arms being positioned to allow said one platen to lie flush with said base in positions on either side of an unstable center position, and tO lift said platen off said base in passing through said unstable center position, whereby the ends of said metal strips on said platens may be overlapped by movement of said one platen toward said other platen, platen drive structure for moving said platens in the direction of elongation of said overlap to advance said overlap between said rollers, means for moving said welding rollers into engagement with the metal strips to be welded, means for applying welding current to said welding rollers while said rollers are in engagement with the metal strips, and indexing means for intermittently moving said platens an incremental distance to advance said overlap between said rollers while simultaneously preventing welding current flow through said welding rollers, said incremental distance being less than one half the average diameter of a spot weld formed by said overlap, and for intermittently ceasing movement of said support structure and allowing welding current flow through said welding rollers.
Claim 3
Dependent Claim
362 words
Apparatus for welding together a narrow, elongated overlap formed by the overlapping ends of two thin metal sheets comprising support structure for supporting said sheets including two adjacent planar support platens secured to a base, and spaced from each other, each said platen including means for maintaining said metal sheet flush upon the platen surface, a first rotatable lower welding roller secured beneath said platens for contacting, along its circumference, the underside of said overlap, a second rotatable upper welding roller aligned with said first roller and secured above said overlap, means for moving said second roller down into contact with the upper side of said overlap and maintaining said overlap under pressure between said rollers, overlap establishing structure for moving one platen towards the welding rollers and the other platen, said overlap establishing structure including at least one lever arm on the forward and rearward sides of said one platen, each arm secured to said base, and means for pivoting said one platen on said lever arms to move said one platen toward said other platen, said lever arms being positioned to allow said one platen to lie flush with said base in positions on either side of an unstable center position, and tO lift said platen off said base in passing through said unstable center position, whereby the ends of said metal strips on said platens may be overlapped by movement of said one platen toward said other platen, platen drive structure for moving said platens in the direction of elongation of said overlap to advance said overlap between said rollers, means for moving said welding rollers into engagement with the metal strips to be welded, means for applying welding current to said welding rollers while said rollers are in engagement with the metal strips, and indexing means for intermittently moving said platens an incremental distance to advance said overlap between said rollers while simultaneously preventing welding current flow through said welding rollers, said incremental distance being less than one half the average diameter of a spot weld formed by said overlap, and for intermittently ceasing movement of said support structure and allowing welding current flow through said welding rollers.
Claim 4
Dependent Claim
362 words
Apparatus for welding together a narrow, elongated overlap formed by the overlapping ends of two thin metal sheets comprising support structure for supporting said sheets including two adjacent planar support platens secured to a base, and spaced from each other, each said platen including means for maintaining said metal sheet flush upon the platen surface, a first rotatable lower welding roller secured beneath said platens for contacting, along its circumference, the underside of said overlap, a second rotatable upper welding roller aligned with said first roller and secured above said overlap, means for moving said second roller down into contact with the upper side of said overlap and maintaining said overlap under pressure between said rollers, overlap establishing structure for moving one platen towards the welding rollers and the other platen, said overlap establishing structure including at least one lever arm on the forward and rearward sides of said one platen, each arm secured to said base, and means for pivoting said one platen on said lever arms to move said one platen toward said other platen, said lever arms being positioned to allow said one platen to lie flush with said base in positions on either side of an unstable center position, and tO lift said platen off said base in passing through said unstable center position, whereby the ends of said metal strips on said platens may be overlapped by movement of said one platen toward said other platen, platen drive structure for moving said platens in the direction of elongation of said overlap to advance said overlap between said rollers, means for moving said welding rollers into engagement with the metal strips to be welded, means for applying welding current to said welding rollers while said rollers are in engagement with the metal strips, and indexing means for intermittently moving said platens an incremental distance to advance said overlap between said rollers while simultaneously preventing welding current flow through said welding rollers, said incremental distance being less than one half the average diameter of a spot weld formed by said overlap, and for intermittently ceasing movement of said support structure and allowing welding current flow through said welding rollers.
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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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |