US3823591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for producing dish-shaped articles
Assignee: Leifeld and Co GmbH
•
Filing: 1972-11-08
•
Granted: 1974-07-16
•
Expires: 1992-11-08
Abstract
Abstract A method and apparatus are disclosed for forming dish-shaped articles from a circular blank by spinning operations. Spinning rollers having large radius shoulders are guided by template control means along a first path to spin the blank to form a curved intermediate shape at a first high speed operation. The intermediate shape is then subjected to a draw spin operation with a smaller radius shoulder guided by a second template control means along a second path distinct from the first path. The speed of operation for the second path is controlled to uniform deformation energy for the second run.
Inventors
- 👤 P Schroder
- 👤 G Pollkotter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:37
CPC Classifications
B; B21; B21D; B21D22/00; B21D22/14; B21D22/16; B21D53/00; B21D53/26; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49481; Y10T29/49492; Y10T29/49496; Y10T29/49504
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
117 words
A method of producing dish-shaped articles from a circular blank comprising the steps of: clamping the blank to a spinning chuck, spin shaping the blank into a curved intermediate shape in air without abutment against said chuck at a first predetermined speed by moving spinning rollers along a first predetermined path for the spinning operation, changing the speed of the spinning rollers during a draw spinning operation and imparting uniform deformation energy for the increments of travel of the spinning rollers during the reduction in cross-sectional thickness of the blank, and moving said spinning rollers along a second discrete path and draw spinning of the blank to the final shape at speeds less than said predetermined speed.
Claim 2
Independent Claim
117 words
A method of producing dish-shaped articles from a circular blank comprising the steps of: clamping the blank to a spinning chuck, spin shaping the blank into a curved intermediate shape in air without abutment against said chuck at a first predetermined speed by moving spinning rollers along a first predetermined path for the spinning operation, changing the speed of the spinning rollers during a draw spinning operation and imparting uniform deformation energy for the increments of travel of the spinning rollers during the reduction in cross-sectional thickness of the blank, and moving said spinning rollers along a second discrete path and draw spinning of the blank to the final shape at speeds less than said predetermined speed.
Claim 3
Dependent Claim
28 words
A method in accordance with claim 1 including the step of reversing the direction of travel of said spinning rollers between traveling along said first and second paths.
Claim 4
Dependent Claim
23 words
A method in accordance with claim 1 including the step of ejecting the finally-shaped article from the spinning chuck while avoiding damage thereto.
Claim 5
Dependent Claim
184 words
In a draw spinning apparatus, a rotatable spinning chuck having a contoured surface thereon, means for clamping a circular-shaped blank to said chuck with the outer peripheral portion spaced from said countered chuck surface, at least two draw spinning rollers each having spinning shoulders for engaging the outer peripheral portion of said blank and for shaping by spinning the outer peripheral portion to the curved intermediate shape during a first run, first control means including a first template means for controlling the movement of said spinning rollers along a first path during the spinning of said blank to said intermediate shape, draw spinning shoulders on each of said spinning rollers for drawing and spinning the intermediate shaped blank against said contoured surface while reducing the cross-sectional thickness of said blank and re-shaping the intermediate shape into a final shape, and second control means including a second template means for controlling the movement of said spinning rollers and said draw and spinning shoulders along a second path distinct from said first path for forming of the blank into a final shape from said intermediate shape.
Claim 6
Dependent Claim
184 words
In a draw spinning apparatus, a rotatable spinning chuck having a contoured surface thereon, means for clamping a circular-shaped blank to said chuck with the outer peripheral portion spaced from said countered chuck surface, at least two draw spinning rollers each having spinning shoulders for engaging the outer peripheral portion of said blank and for shaping by spinning the outer peripheral portion to the curved intermediate shape during a first run, first control means including a first template means for controlling the movement of said spinning rollers along a first path during the spinning of said blank to said intermediate shape, draw spinning shoulders on each of said spinning rollers for drawing and spinning the intermediate shaped blank against said contoured surface while reducing the cross-sectional thickness of said blank and re-shaping the intermediate shape into a final shape, and second control means including a second template means for controlling the movement of said spinning rollers and said draw and spinning shoulders along a second path distinct from said first path for forming of the blank into a final shape from said intermediate shape.
Claim 7
Dependent Claim
46 words
An apparatus in accordance with claim 4 in which each of said spinning shoulders has a larger radius than the radius of said draw spinning shoulders, said draw spinning shoulders being located radially outwardly of said spinning shoulders from a rotational axis for said spinning roller.
Claim 8
Dependent Claim
60 words
An apparatus in accordance with claim 4 in which said first template means for controlling the path of the spinning operation is located adjacent said template means for controlling the path of the spin drawing operation and in which means are provided for displacing one of said template means to allow use of the other one of said template means.
Claim 9
Dependent Claim
41 words
An apparatus in accordance with claim 4 in which said spinning rollers are rotated at a higher speed for the spinning operation and at a slower speed for the draw spinning operation, the latter operation being conducted with uniform deformation energy.
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) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |