US3592029A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tube-bending machine
Assignee: Schwarze Sohne Gebr Schwarze P
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Filing: 1969-08-11
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Granted: 1971-07-13
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Expires: 1989-08-11
Abstract
Abstract In a fully automatic cold tube-bending machine for production of serpentine coils from straight tubes of random lengths, a tube feeder not only measures the tube feed between successive bends, but also, after the last bend in any given tube, senses the tube end and measures the residual terminal length or the deficiency from the length to the next succeeding bend in a desired larger coil, and, by generating a corresponding control signal, initially feeds the next tube by the amount of the length deficiency, with allowance for any tubing length adjustment for the joint to be made between successive tubes; so that successively bent tubes may be appropriately joined without fitting or matching operations.
Inventors
- 👤 Erich Ritter
- 👤 Ranganathan Guruswami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:20
CPC Classifications
B; B21; B21D; B21D11/00; B21D11/06; B21D11/07; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49391
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
177 words
In an automatic tube-bending machine for bending serpentine coil parts from successive straight tubes of random lengths, a plurality of which parts are to be joined in the order of successive bending into a larger coil unit, the lengths of the straight tubes such that the trailing ends will occur on straight stub ends shorter than the straight leg lengths between successive bends of the desired coil unit, said machine including a bending mechanism for bending straight tube fed thereto, that improvement comprising: means for feeding measured lengths of a tube to said bending mechanism, means associated with the feeding means for detecting the trailing end of a tube being fed, and means responsive to detection of a said trailing end to determine the deficiency of the stub length from the requisite straight leg length and provide a signal to the machine to control the feeding to the bending mechanism of an initial succeeding tube portion of such length as provides, in the coil part bent from said succeeding tube, a complement to the preceeding stub length.
Claim 2
Dependent Claim
177 words
In an automatic tube-bending machine for bending serpentine coil parts from successive straight tubes of random lengths, a plurality of which parts are to be joined in the order of successive bending into a larger coil unit, the lengths of the straight tubes such that the trailing ends will occur on straight stub ends shorter than the straight leg lengths between successive bends of the desired coil unit, said machine including a bending mechanism for bending straight tube fed thereto, that improvement comprising: means for feeding measured lengths of a tube to said bending mechanism, means associated with the feeding means for detecting the trailing end of a tube being fed, and means responsive to detection of a said trailing end to determine the deficiency of the stub length from the requisite straight leg length and provide a signal to the machine to control the feeding to the bending mechanism of an initial succeeding tube portion of such length as provides, in the coil part bent from said succeeding tube, a complement to the preceeding stub length.
Claim 3
Dependent Claim
58 words
The automatic tube-bending machine improvement described in claim 1, wherein said feeding device comprises a carriage travelling toward and away from said bending mechanism in advance and return strokes, and a tube-clamping collet on the carriage closable on a tube thereby to feed a tube length corresponding to a carriage advance stroke portion ensuing immediately after collet clamping.
Claim 4
Dependent Claim
41 words
The improvement described in claim 2, wherein the said means associated with the feeding means comprises a sensor device disposed on the carriage proximate to the tubing path through the carriage, said device responsive to transit thereby of a tubing end.
Claim 5
Dependent Claim
32 words
The improvement as described in claim 3, wherein said device comprises a switch and tube-contacting means operating said switch from one to another switch condition upon passage of a tube trailing end.
Claim 6
Dependent Claim
16 words
The improvement described in claim 3, wherein said device comprises photoelectric cell and light source means.
Claim 7
Dependent Claim
24 words
The improvement described in claim 3, wherein said device comprises an inductance coil responding by change in inductance to transit of a tube-trailing end.
Claim 8
Dependent Claim
36 words
The improvement described in claim 3, wherein said machine is numerically controlled through punched tape, and is preprogrammed to carry out the operation of determining the said deficiency only upon detection of a said trailing end.
Claim 9
Dependent Claim
87 words
The improvement as described in claim 2, wherein said means responsive to detection of a said trailing end to determine the deficiency of the stub length includes a shaft-driven pulse generator generating pulses proportionately to rotation of its driving shaft, a first element extending parallel to the direction of travel of said carriage, a rotatioNal second element secured on the driving shaft of said pulse generator and so engaged with the said first element that said shaft is rotated corresponding to the stroke movement of the carriage.
Claim 10
Dependent Claim
34 words
The improvement as described in claim 8, wherein said pulse generator is mounted on said carriage, said first element is a fixed rack, and said second element is a pinion on said driving shaft.
Claim 11
Dependent Claim
41 words
The improvement described in claim 9, wherein the said means associated with the feeding means comprises a sensor device disposed on the carriage proximate to the tubing path through the carriage, said device responsive to transit thereby of a tubing end.
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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |