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US3129505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of manufacturing one piece brake drum shells
Assignee: Individual
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Filing: 1961-05-09
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Granted: 1964-04-21
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Expires: 1981-05-09
Abstract
No abstract record available.
Inventors
- 👤 Darwin S Cox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:28
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/26; B21D53/34; F; F16; F16D; F16D65/00; F16D65/02; F16D2065/13; F16D2065/1304; F16D2065/132
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
IN A METHOD OF MANUFACTURING BRAKE DRUM SHELLS, THE STEPS OF PROVIDING A RECTANGULAR PLATE, WRAPPING THE PLATE INTO A CYLINDER HAVING ABUTTING EDGES, WELDING THE ABUTTING EDGES, TRIMMING THE WELD, TAPER-EXPANDING AND THINNING A LARGE PORTION OF THE TOTAL BLANK LENGTH AND INWARDLY CURLING AND REDUCING THE DIAMETER OF THE REMAINING PORTION OF SAID BLANK LENGTH TO THICKEN SAME, SAID CURLING BEING ACCOMPLISHED BY CONFINING AND FIRMLY HOLDING SAID TAPER-EXPANDED PORTION WHILE FORCING SAID REMAINING PORTION INWARDLY BETWEEN GENERALLY ARCUATELY CURVED DIE SURFACES AND MAINTAINING A YIELDING PRESSURE ON THE PORTION BEING CURLED AND THEREAFTER FLATTENING SAID CURLED PORTION INTO A SUBSTANTIALLY COMMON PLANE PERPENDICULAR TO THE AXIS OF THE BLANK AND FORMING A SUBSTANTIAL SEGMENT OF SAID LARGE TAPERED AND EXPANDED PORTION INTO A GENERALLY CYLINDRICAL FORM SURROUNDING SAID BLANK AXIS.
Claim 2
Dependent Claim
133 words
IN A METHOD OF MANUFACTURING BRAKE DRUM SHELLS, THE STEPS OF PROVIDING A RECTANGULAR PLATE, WRAPPING THE PLATE INTO A CYLINDER HAVING ABUTTING EDGES, WELDING THE ABUTTING EDGES, TRIMMING THE WELD, TAPER-EXPANDING AND THINNING A LARGE PORTION OF THE TOTAL BLANK LENGTH AND INWARDLY CURLING AND REDUCING THE DIAMETER OF THE REMAINING PORTION OF SAID BLANK LENGTH TO THICKEN SAME, SAID CURLING BEING ACCOMPLISHED BY CONFINING AND FIRMLY HOLDING SAID TAPER-EXPANDED PORTION WHILE FORCING SAID REMAINING PORTION INWARDLY BETWEEN GENERALLY ARCUATELY CURVED DIE SURFACES AND MAINTAINING A YIELDING PRESSURE ON THE PORTION BEING CURLED AND THEREAFTER FLATTENING SAID CURLED PORTION INTO A SUBSTANTIALLY COMMON PLANE PERPENDICULAR TO THE AXIS OF THE BLANK AND FORMING A SUBSTANTIAL SEGMENT OF SAID LARGE TAPERED AND EXPANDED PORTION INTO A GENERALLY CYLINDRICAL FORM SURROUNDING SAID BLANK AXIS.
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) | 1967-04-21 | 1967-10-21 | 1968-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-21 | 1971-10-21 | 1972-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-21 | 1975-10-21 | 1976-04-21 | $7700.00 | Window Closed / Lapsed |