Patent US3765985A successfully refreshed from Google Patents.
US3765985A
Expired / Lapsed
US
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Apparatus for welding two sheets by ultra high frequency energy
Assignee: Compagnie Francaise de Raffinage SA
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Filing: 1971-11-08
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Granted: 1973-10-16
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Expires: 1991-11-08
Abstract
Abstract Two sheets of material are heated to welding temperature by UHF energy by being first passed through a resonant cavity in which UHF energy is applied to the sheets in an overlapped region thereof whereafter the sheets are pressed together. The resonant cavity and the pressing rollers are carried on a traveling framework which is disposed in a pit, and one of the sheets is unwound as the framework travels to be overlapped onto the other sheet which is stationary and which extends over the pit at one of the edges thereof.
Inventors
- 👤 M Siard
- 👤 M Laurentie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:39
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/02; B29C65/14; B29C65/1403; B29C65/1425; B29C65/1496; B29C65/78; B29C65/7802; B29C65/7835; B29C65/7858; B29C65/7888; B29C65/7894; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/70; B29C66/71; B29C66/80; B29C66/82; B29C66/824; B29C66/8242; B29C66/83; B29C66/836; B29C66/8362; B29C66/84; B29C66/845; B29C66/865; B29C66/8652; B29C66/86521; B29C35/00; B29C35/02; B29C35/08; B29C35/0805; B29C2035/0855; B29C66/435
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
198 words
Apparatus for welding together first and second sheets of material which are heated when exposed to UHF energy, said apparatus comprising a resonant cavity adapted for being connected to a UHF wave generator, pressing means in alignment with said resonant cavity at one end thereof, means for overlapping the first and second sheets in a region aligned with said resonant cavity, means for effecting simultaneous relative displacement of the said resonant cavity and said pressing means with respect to said sheets to cause the overlapping region of the sheets to pass first through said resonant cavity where the sheets are heated to welding temperature and then into the pressing means where the welded sheets are pressed together, said resonant cavity including two independent members arranged respectively on opposite sides of the overlapping region of the two sheets to be welded, said sheets paSsing between said members as the sheets and members undergo relative movement, each said member comprising projecting lateral flanges of a width equal to at least one quarter of the wavelength corresponding to the excitation frequency of the cavity, and means for moving one member of said cavity relative to the other to separate the same.
Claim 2
Dependent Claim
198 words
Apparatus for welding together first and second sheets of material which are heated when exposed to UHF energy, said apparatus comprising a resonant cavity adapted for being connected to a UHF wave generator, pressing means in alignment with said resonant cavity at one end thereof, means for overlapping the first and second sheets in a region aligned with said resonant cavity, means for effecting simultaneous relative displacement of the said resonant cavity and said pressing means with respect to said sheets to cause the overlapping region of the sheets to pass first through said resonant cavity where the sheets are heated to welding temperature and then into the pressing means where the welded sheets are pressed together, said resonant cavity including two independent members arranged respectively on opposite sides of the overlapping region of the two sheets to be welded, said sheets paSsing between said members as the sheets and members undergo relative movement, each said member comprising projecting lateral flanges of a width equal to at least one quarter of the wavelength corresponding to the excitation frequency of the cavity, and means for moving one member of said cavity relative to the other to separate the same.
Claim 3
Dependent Claim
45 words
Apparatus as claimed in claim 1 wherein the first sheet is stationary and the resonant cavity and pressing means are displaceable with respect thereto, said apparatus further comprising means for inactivating the pressing means when the members of said cavity are separated from one another.
Claim 4
Dependent Claim
129 words
Apparatus as claimed in claim 1 wherein the first sheet is stationary and the resonant cavity and pressing means are displaceable with respect thereto, said apparatus further comprising a framework supporting said resonant cavity and said pressing means, a bracket supported by said framework and extending transversely thereof, a carrier spindle mounted on said bracket for supporting a roll of the second sheet, at least one train of carrier rollers supported on the framework beneath said bracket and extending in the same plane as the junction of the two members of the resonant cavity, said means for displacing the resonant cavity and the pressing means with respect to the sheets comprising means for driving said framework and guiding the same relative to the edge of the said first sheet.
Claim 5
Dependent Claim
40 words
Apparatus as claimed in claim 3 wherein said pressing means comprises two sets of cooperating rolls supported by said framework and arranged adjacent the resonant cavity in the direction of movement of said framework in relation to the first sheet.
Claim 6
Dependent Claim
71 words
Apparatus as claimed in claim 4 wherein one of said members of the resonant cavity and one of said sets of rolls of the pressing means are rigidly fastened to said framework, the apparatus further comprising means supporting the second member of the resonant cavity and the second set of rolls of the press means from the bracket for common movement towards and away from the overlapped region of the sheets.
Claim 7
Dependent Claim
56 words
Apparatus as claimed in claim 5 wherein said framework includes two wheel supports, at least one motor assembly for driving one of said wheel supports and means for swiveling the wheels of the other wheel support to maintain the same degree of overlap of the second sheet with respect to the edge of the first sheet.
Claim 8
Dependent Claim
69 words
Apparatus as claimed in claim 6 comprising driving rollers mounted on said framework, means for driving the said driving rollers in unison with at least some of the rollers in said train of rollers extending at the same level as the junction portion of the two members of the resonant cavity, the latter rollers and said driving rollers cooperating to advance the second sheet of material from its roll.
Claim 9
Dependent Claim
31 words
Apparatus as claimed in claim 7 comprising a second train of rollers arranged beyond the pressing means for supporting said second sheet after the sheets have been welded and are cooling.
Claim 10
Dependent Claim
45 words
Apparatus as claimed in claim 8 wherein said framework is disposed in a pit, said members of the resonant cavity defining a space therebetween which is at the same level as the ground surrounding said pit and on which the first sheet is laid flat.
Claim 11
Dependent Claim
173 words
Apparatus for welding together first and second sheets of material which are heated when exposed to UHF energy, said apparatus comprising a resonant cavity adapted for being connected to a UHF wave generator, pressing means in alignement with said resonant cavity of one end thereof, means for overlapping the first and second sheets in a region aligned with said resonant cavity, means for effecting simultaneous relative displacement of the said resonant cavity and said pressing means with respect to said sheets to cause the overlapping region of the sheets to pass first through said resonant cavity where the sheets are heated to welding temperature and thein into the pressing means where the welded sheets are pressed together, Said first sheet being stationary, a displaceable framework supporting said resonant cavity and said pressing means for common displacement therewith, and means on said framework for placing the second sheet on the first sheet as the framework is displaced, the overlapped region of the sheets then passing successively through the resonant cavity and the pressing means.
Claim 12
Dependent Claim
173 words
Apparatus for welding together first and second sheets of material which are heated when exposed to UHF energy, said apparatus comprising a resonant cavity adapted for being connected to a UHF wave generator, pressing means in alignement with said resonant cavity of one end thereof, means for overlapping the first and second sheets in a region aligned with said resonant cavity, means for effecting simultaneous relative displacement of the said resonant cavity and said pressing means with respect to said sheets to cause the overlapping region of the sheets to pass first through said resonant cavity where the sheets are heated to welding temperature and thein into the pressing means where the welded sheets are pressed together, Said first sheet being stationary, a displaceable framework supporting said resonant cavity and said pressing means for common displacement therewith, and means on said framework for placing the second sheet on the first sheet as the framework is displaced, the overlapped region of the sheets then passing successively through the resonant cavity and the pressing means.
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |