Patent US3718960A successfully refreshed from Google Patents.
US3718960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine for manufacturing helical fin tubes
Assignee: Individual
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Filing: 1970-12-11
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Granted: 1973-03-06
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Expires: 1990-12-11
Abstract
Abstract A process of manufacturing fin tubes consisting in cutting series of metal plates of desired length from metal strips, feeding said plates in a guide towards the outer periphery of a tube and fastening the plates e.g. by welding by their end edges in a circular or helical row onto the outer surface of the tube, so that the length of the plates corresponds to the height of the fin formed of the plates, thus permitting the adjustment of the height of the fin solely by cutting metal plates of different length from one single strip or strips of the same width. A machine for performing the process consists of a device for feeding loose metal plates cut from a strip of determined width in a row into a gutter-like guide, means for moving said plates along said guide in desired spacing relation towards the outer periphery of a tube, means for rotating said tube and possibly also for longitudinal displacement thereof relative to said gutter-like and means for welding said metal plates with their end edges onto the tube in a row to form a fin thereon.
Inventors
- 👤 S Soderstrom
- 👤 O Cardell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:44
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/22; B21C37/26; B21C37/24; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T29/49382; Y10T29/51; Y10T29/5136; Y10T29/5137; Y10T29/5142; Y10T29/53; Y10T29/53113
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
92 words
A process of manufacturing fin tubes having helical fin means interrupted by slot-like openings at least at the outer edge of the helical fin means, comprising cutting a plurality of metal plates from a metal strip by means of transverse cuts, the length of said metal plates being equal to the height of the fin to be formed and metallurgically bonding one end of each of said metal plates to the tube in a helical series one after the other so that the intervals between the metal plates define said slot-like openings.
Claim 2
Dependent Claim
92 words
A process of manufacturing fin tubes having helical fin means interrupted by slot-like openings at least at the outer edge of the helical fin means, comprising cutting a plurality of metal plates from a metal strip by means of transverse cuts, the length of said metal plates being equal to the height of the fin to be formed and metallurgically bonding one end of each of said metal plates to the tube in a helical series one after the other so that the intervals between the metal plates define said slot-like openings.
Claim 3
Dependent Claim
92 words
A process of manufacturing fin tubes having helical fin means interrupted by slot-like openings at least at the outer edge of the helical fin means, comprising cutting a plurality of metal plates from a metal strip by means of transverse cuts, the length of said metal plates being equal to the height of the fin to be formed and metallurgically bonding one end of each of said metal plates to the tube in a helical series one after the other so that the intervals between the metal plates define said slot-like openings.
Claim 4
Dependent Claim
92 words
A process of manufacturing fin tubes having helical fin means interrupted by slot-like openings at least at the outer edge of the helical fin means, comprising cutting a plurality of metal plates from a metal strip by means of transverse cuts, the length of said metal plates being equal to the height of the fin to be formed and metallurgically bonding one end of each of said metal plates to the tube in a helical series one after the other so that the intervals between the metal plates define said slot-like openings.
Claim 5
Dependent Claim
60 words
A process as claimed in claim 1 further comprising feeding said plurality of metal plates one after the other along a gutter-like guide toward the outside of the tube and welding said plates on the tube while rotating the tube about its longitudinal axis and displacing said tube and guide in the direction of said axis relative to each other.
Claim 6
Dependent Claim
36 words
A process as claimed in claim 2 furTher comprising welding with additional material to form a continuous ridge on the outside of the tube even across any intervals between the metal plates welded onto the tube.
Claim 7
Dependent Claim
47 words
A process as claimed in claim 1 further comprising executing the cutting of the strip to metal plates by stamping and forming the end edges of the metal plates along a curved line of about the same radius of curvature as the outer periphery of the tube.
Claim 8
Dependent Claim
36 words
A process as claimed in claim 1 further comprising maintaining said plates in a line and metallurgically bonding said plates to said tube in the same sequence in which said plates were cut from said strip.
Claim 9
Dependent Claim
60 words
A machine for manufacturing fin tubes having helical fins comprising a gutter-like guide for feeding loose metal plates one after the other toward the outside of a tube, means for inserting the metal plates into said guide, means for welding said plates onto the tube, and means to rotate said tube about its longitudinal axis as the plates are supplied.
Claim 10
Dependent Claim
60 words
A machine for manufacturing fin tubes having helical fins comprising a gutter-like guide for feeding loose metal plates one after the other toward the outside of a tube, means for inserting the metal plates into said guide, means for welding said plates onto the tube, and means to rotate said tube about its longitudinal axis as the plates are supplied.
Claim 11
Dependent Claim
70 words
A machine as claimed in claim 6 wherein said inserting means comprises a feed stoker, an extracting conveyor for extracting the metal plates one by one from said stoker and for feeding them in a row to said gutter-like guide, and an endless belt with clips arranged to grip the metal plates and to feed them along the gutter-like guide to the welding station at the outside of the tube.
Claim 12
Dependent Claim
101 words
A machine as claimed in claim 6 wherein said inserting means comprises a stoker having a number of upright channels, each having at its lower end a side opening, an extracting conveyor, said openings being turned toward the extracting conveyor and said extracting conveyor comprising an endless belt having projections on the side thereof turned toward the side openings, the projections being arranged in spaced relation at intervals equal to the width of the metal plates so as to permit the belt, when a projection is passing, to catch a metal plate between the projections of a pair of consecutive projections.
Claim 13
Dependent Claim
44 words
A machine as claimed in claim 8 wherein each channel is restricted at its lower end by an inclined wall on which the metal plates are arranged to slide down toward the side of the belt under the action of the overlying metal plates.
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) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |