US3110341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for making elbows by forcing tubular stock through a die
Assignee: Nibco Inc
•
Filing: 1961-06-12
•
Granted: 1963-11-12
•
Expires: 1981-06-12
Abstract
No abstract record available.
Inventors
- 👤 John D Stalter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:38
CPC Classifications
B; B21; B21D; B21D9/00; B21D9/12; B21D9/125; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49428; Y10T29/49444
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
THE METHOD OF FORMING AN ELBOW FROM STRAIGHT TUBULAR STOCK WHICH COMPRISES PLACING THE STOCK IN A DIE HAVING AN ELBOW-SHAPED PASSAGE INCLUDING AN ARCUATE BEND, PROVIDING IN THE INTERIOR OF THE TUBULAR STOCK A SOLID MANDREL OF NORMAL CIRCULAR CROSS SECTION WHICH HAS A PAIR OF EXTERNAL SMOOTH PERIPHERAL SURFACES AT OPPOSITE SIDES THEREOF, ONE SURFACE BEING CYLINDRICAL AND THE OTHER SURFACE BEING LONGITUDINALLY AND TRANSVERSELY CONVEX, WITH THE CYLINDRICAL SURFACE ADJACENT THE SIDE OF THE STOCK CORRESPONDING TO THE INSIDE OF THE BEND, FORCIBLY MOVING THE STOCK AND MANDREL SO AS TO PUSH THE STOCK INTO THE BEND TO SHAPE THE MATERIAL AT THE OUTSIDE OF THE BEND TO CONFORM TO THE CONVEX SURFACE OF THE MANDREL, AND THEREAFTER FORCING THE MANDREL THROUGH THE STOCK TO SHAPE MATERIAL AT THE INSIDE OF THE BEND.
Claim 2
Independent Claim
136 words
THE METHOD OF FORMING AN ELBOW FROM STRAIGHT TUBULAR STOCK WHICH COMPRISES PLACING THE STOCK IN A DIE HAVING AN ELBOW-SHAPED PASSAGE INCLUDING AN ARCUATE BEND, PROVIDING IN THE INTERIOR OF THE TUBULAR STOCK A SOLID MANDREL OF NORMAL CIRCULAR CROSS SECTION WHICH HAS A PAIR OF EXTERNAL SMOOTH PERIPHERAL SURFACES AT OPPOSITE SIDES THEREOF, ONE SURFACE BEING CYLINDRICAL AND THE OTHER SURFACE BEING LONGITUDINALLY AND TRANSVERSELY CONVEX, WITH THE CYLINDRICAL SURFACE ADJACENT THE SIDE OF THE STOCK CORRESPONDING TO THE INSIDE OF THE BEND, FORCIBLY MOVING THE STOCK AND MANDREL SO AS TO PUSH THE STOCK INTO THE BEND TO SHAPE THE MATERIAL AT THE OUTSIDE OF THE BEND TO CONFORM TO THE CONVEX SURFACE OF THE MANDREL, AND THEREAFTER FORCING THE MANDREL THROUGH THE STOCK TO SHAPE MATERIAL AT THE INSIDE OF THE BEND.
References Cited (Backward Citations)
US1993361A
Cited
US2612205A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-11-11 | 1967-05-13 | 1967-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-11-11 | 1971-05-13 | 1971-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-11-11 | 1975-05-13 | 1975-11-12 | $7700.00 | Window Closed / Lapsed |