Patent US6302913B1 successfully refreshed from Google Patents.
Patent US3858540A successfully refreshed from Google Patents.
US3858540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Making continuous joint between flat sheets
Assignee: Svenska Flaktfabriken AB
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Filing: 1972-12-04
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Granted: 1975-01-07
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Expires: 1992-12-04
Abstract
Abstract A method and apparatus for making a continuous joint between the longitudinal marginal edges of co-planar sheets wherein the sheets are advanced into the apparatus in co-planar relation with their adjacent margins overlapped. At a first station, both margins are bent down to provide a space between the sheets. At the next station, one margin is bent back so that at its edge a down-turned lip engages the down-turned margin of the other sheet. At a following station, the latter margin is wrapped about the lip to form an interlocked seam, and at a final station, the seam is flattened against the first margin. The apparatus includes pressing rollers above and below the plane of the sheets, the upper and lower rolls being coupled together at the first station in the space formed between the sheets.
Inventors
- 👤 Knut Berg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:28
CPC Classifications
B; B21; B21D; B21D39/00; B21D39/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
291 words
An apparatus comprising a working table having an upper surface and provided with pressing rollers, the upper rollers being supported in a beam and driven by a drive motor, and conveying tables coplanar with said upper surface and located on both sides of said working table with roller conveyors for work elements, said tables along their lateral edges provided with control means, for conveying the work elements along the plane of said tables in a straight-line path in which the inner edge portions overlap, the lower surface of the beam being located at a distance above the upper plane surface of the working table exceeding the total thickness of the overlapping edge portions of the work elements, the pressing rollers adjacent the feed end of said table operable to bend down said edge portions to separate them and form a free space between said work elements, the beam being connected with the working table by a beam holder in said free space having a length in the conveying direction of the work elements somewhat shorter and a width somewhat smaller than the aforesaid free space between the bent-down and separated edge portions the pressing rollers located immediately after said free space being provided with a substantially horizontal axle and adapted to lift only one edge portion to join closely the other edge portion, and the remaining pressing rollers located after the free space in the direction of feed of said elements being inclined to the horizontal plane to wrap said other free edge portion around said one edge portion and interlock tHe same, followed by at least one pair of pressing rollers with substantially horizontal axles and a substantially plane nip surface to flatten said interlocked positions into said conveying plane.
Claim 2
Independent Claim
291 words
An apparatus comprising a working table having an upper surface and provided with pressing rollers, the upper rollers being supported in a beam and driven by a drive motor, and conveying tables coplanar with said upper surface and located on both sides of said working table with roller conveyors for work elements, said tables along their lateral edges provided with control means, for conveying the work elements along the plane of said tables in a straight-line path in which the inner edge portions overlap, the lower surface of the beam being located at a distance above the upper plane surface of the working table exceeding the total thickness of the overlapping edge portions of the work elements, the pressing rollers adjacent the feed end of said table operable to bend down said edge portions to separate them and form a free space between said work elements, the beam being connected with the working table by a beam holder in said free space having a length in the conveying direction of the work elements somewhat shorter and a width somewhat smaller than the aforesaid free space between the bent-down and separated edge portions the pressing rollers located immediately after said free space being provided with a substantially horizontal axle and adapted to lift only one edge portion to join closely the other edge portion, and the remaining pressing rollers located after the free space in the direction of feed of said elements being inclined to the horizontal plane to wrap said other free edge portion around said one edge portion and interlock tHe same, followed by at least one pair of pressing rollers with substantially horizontal axles and a substantially plane nip surface to flatten said interlocked positions into said conveying plane.
Claim 3
Dependent Claim
296 words
Apparatus for continuously joining two parallel surface elements of thin material located in the same plane comprising a working table, and means to advance the elements along said working table from the feed end to the discharge end thereof, said advancing means operable to feed in the elements in edge-overlapping relation at the feed end, a beam overlying said working table and extending along the length thereof, roller means on said beam to press against the overlapping edge portions of the elements, means to drive said roller means concurrently with the advance of said elements, said roller means including a pair of pressing rollers having horizontal axes to deflect the overlapping edge portions of said elements downwardly out of said common plane to provide a free space between the bent-down portions, said beam being connected with the working table by a beam holder positioned intermediate the feed end and the discharge end of said working table in said free space, said roller means including pairs of pressing rollers on the discharge side of said holder including a pair having a horizontal axis adapted to lift one of said bent-down edge portions into said common plane and to form a downturned lip along the free edge of said portion, which lip is disposed closely adjacent the other bent-down edge portion, said roller means including rollers beyond said last mentioned pair having their axes inclined to the horizontal to wrap said other bent-down edge portion around said downturned lip of the lifted edge portion, and at least one pair of pressing rollers adjacent the discharge end of said table having horizontal axes to press back said downturned lip portion with a reverse bend to underlie said lifted edge portion to form a continuous joint with said wrapped-around portion.
Claim 4
Dependent Claim
296 words
Apparatus for continuously joining two parallel surface elements of thin material located in the same plane comprising a working table, and means to advance the elements along said working table from the feed end to the discharge end thereof, said advancing means operable to feed in the elements in edge-overlapping relation at the feed end, a beam overlying said working table and extending along the length thereof, roller means on said beam to press against the overlapping edge portions of the elements, means to drive said roller means concurrently with the advance of said elements, said roller means including a pair of pressing rollers having horizontal axes to deflect the overlapping edge portions of said elements downwardly out of said common plane to provide a free space between the bent-down portions, said beam being connected with the working table by a beam holder positioned intermediate the feed end and the discharge end of said working table in said free space, said roller means including pairs of pressing rollers on the discharge side of said holder including a pair having a horizontal axis adapted to lift one of said bent-down edge portions into said common plane and to form a downturned lip along the free edge of said portion, which lip is disposed closely adjacent the other bent-down edge portion, said roller means including rollers beyond said last mentioned pair having their axes inclined to the horizontal to wrap said other bent-down edge portion around said downturned lip of the lifted edge portion, and at least one pair of pressing rollers adjacent the discharge end of said table having horizontal axes to press back said downturned lip portion with a reverse bend to underlie said lifted edge portion to form a continuous joint with said wrapped-around portion.
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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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |