US3581046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure control for tube mill
Assignee: Individual
•
Filing: 1968-10-28
•
Granted: 1971-05-25
•
Expires: 1988-10-28
Abstract
Abstract An improved tube mill generally employed in the production of steel tubing by the continuous electric resistance welding of an axially extending seam cleft in a cylindrical tube length formed from a continuous length of metal strips, and directly responsive fluid pressure means to maintain a constant pressure relationship between the welding element and the support means for said tubes to produce uniform welds in said tubing.
Inventors
- 👤 Charles E Letsche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:42
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/06; B23K11/061; B23K11/062
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
133 words
In a tube welding machine having a base, means for supporting a workpiece on said base, and means for welding the workpiece into a tubular form, the improvement comprising a directly responsive double acting fluid pressure means to maintain a constant pressure relationship between the support means and the weld means relative to the workpiece, said fluid pressure means including a fixed housing, a diaphragm disposed within said housing and separating said housing into multiple chambers, means connecting said diaphragm to said welding means, means for introducing fluid under pressure into one of said chambers to apply a support force to said welding means, and means for introducing fluid under pressure into the other of said chambers to apply a controlled force to said welding means in overriding opposition to said support force.
Claim 2
Dependent Claim
133 words
In a tube welding machine having a base, means for supporting a workpiece on said base, and means for welding the workpiece into a tubular form, the improvement comprising a directly responsive double acting fluid pressure means to maintain a constant pressure relationship between the support means and the weld means relative to the workpiece, said fluid pressure means including a fixed housing, a diaphragm disposed within said housing and separating said housing into multiple chambers, means connecting said diaphragm to said welding means, means for introducing fluid under pressure into one of said chambers to apply a support force to said welding means, and means for introducing fluid under pressure into the other of said chambers to apply a controlled force to said welding means in overriding opposition to said support force.
Claim 3
Dependent Claim
44 words
The structure of claim 1, in which said welding means is mounted on a frame swingably mounted on said base, and said means for connecting said diaphragm to said welding means is connected to said frame intermediate the welding means and said swingable connection.
Claim 4
Dependent Claim
52 words
The structure of claim 1 in which said means for introducing fluid under pressure into one of said chambers includes regulator means for introducing a constant pressure into said one chamber, and surge means to balance the pressures within said chambers so that a substantially constant pressure is maintained on said workpiece.
Claim 5
Dependent Claim
73 words
The structure of claim 3 in which the means for introducing fluid under pressure into the other of said chambers includes regulator means for introducing fluid under a greater pressure into said other chamber than was supplied to said one chamber to cause said welding means to engage said workpiece under a constant pressure. 5. The structure of claim 1 including indicator means for indicating the position of the diaphragm within said housing.
Claim 6
Dependent Claim
23 words
The structure of claim 1 including means for adjusting the position of said housing and for maintaining said housing in fixed adjusted position.
References Cited (Backward Citations)
USRE25300E
Cited
US1478262A
Cited
US2237551A
Cited
US2582963A
Cited
US2833219A
Cited
US2974640A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |