Patent US3929540A successfully refreshed from Google Patents.
US3929540A
Expired / Lapsed
US
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Method and drum for building and shaping blanks for radial-ply tires
Assignee: Rheinstahl AG
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Filing: 1974-12-19
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Granted: 1975-12-30
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Expires: 1994-12-19
Abstract
Abstract A drum for building and shaping blanks for radial-ply tires comprises two co-axial bead holders at least one of which has an extension drum which is co-axial therewith, is secured thereto and has the same outside diameter. The extension drum acts in part as a support for a tire band while the latter is being secured to the bead holders for shaping. The bead holders are movable axially relative one to the other to position the tire band for shaping and each is provided with radially movable segments to which end portions of the tire band are secured in airtight manner. During relative axial movement of the bead holders towards each other, a gaseous medium is introduced into the space bounded by the bead holders and the tire band so that the band is curved outwards to form a tire blank.
Inventors
- 👤 Gerhard Held
- 👤 Walter Balle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:25
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06; B29D30/36; B29D30/08; B29D30/20; B29D30/32; B29D2030/3214; B29D2030/3221; B29D2030/3257
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
262 words
A METHOD FOR BUILDING AND SHAPING A TIRE-CARCASS ON A TIRE BUILDING DRUM HAVING TWO RADIALLY EXPANDABLE BEAD HOLDERS MOVABLE RELATIVE TO ONE ANOTHER, AN EXTENSION DRUM ON AT LEAST ONE BEAD HOLDER, AND MEANS OFR FEEDING COMPRESSED GAS INTO A CHAMBER LOCATED BETWEEN THE BEAD HOLDERS, COMPRISING THE METHOD STEPS: A. BRINGING CLOSELY TOGETHER THE BEAD HOLDERS AND THEREBY FORMING A SUBSTANTIALLY CONTINUOUS CYLINDRICAL SURFACE; B. LAYING A TIRE BAND ON SAID CYLINDRICAL SURFACE WITH ONE AXIAL END OF THE TIRE BAND SPACED AXIALLY BEYOND SAID ONE BEAD HOLDER BY A DISTANCE A EQUAL TO THE LENGTH OF THE AXIAL END PORTION OF THE TIRE BAND TO BE FOLDED AROUND A BEAD RING; C. LOCATING A BEAD RING AROUND THE TIRE BAND AT SAID DISTANCE FROM SAID ONE AXIAL END OF SAID TIRE BAND AND AXIALLY FIXING THE TIRE BAND TO SAID ONE BEAD HOLDER BY EXPANDING SAID ONE BEAD HOLDER AND THEREBY CLAMPING SAID TIRE BAND AGAINST SAID BEAD RING; D. AXIALLY MOVING APART SAID BEAD HOLDER AND THEREBY CORRESPONDINGLY SPACING THE OTHER BEAD HOLDER FROM THE REMAINING FREE AXIAL END OF THE BAND; E. LOCATING A FURTHER BEAD RING AROUND THE TIRE BAND IN RADIAL OPPOSITION TO SAID OTHER BEAD HOLDER AND EXPANDING SAID OTHER BEAD HOLDER AND THEREBY CLAMPING SAIA TIRE BAND AGAINST SAID FURTHER BEAD RING; F. INTRODUCING A COMPRESSED GAS INTO THE CHAMBER FORMED BY THE TWO BEAD HOLDERS AND THE TIRE BAND WHILE SIMULDTANEOUSLY REDUCING THE ACIAL SEPARATION BETWEEN SAID BEAD HOLDERS AND THEREBY FORMING THE SUBSTANTIALLY CYLINDRICAL TIRE BAND INTO A SUBSTANTIALLY TOROIDAL SHAPE.
Claim 2
Independent Claim
262 words
A METHOD FOR BUILDING AND SHAPING A TIRE-CARCASS ON A TIRE BUILDING DRUM HAVING TWO RADIALLY EXPANDABLE BEAD HOLDERS MOVABLE RELATIVE TO ONE ANOTHER, AN EXTENSION DRUM ON AT LEAST ONE BEAD HOLDER, AND MEANS OFR FEEDING COMPRESSED GAS INTO A CHAMBER LOCATED BETWEEN THE BEAD HOLDERS, COMPRISING THE METHOD STEPS: A. BRINGING CLOSELY TOGETHER THE BEAD HOLDERS AND THEREBY FORMING A SUBSTANTIALLY CONTINUOUS CYLINDRICAL SURFACE; B. LAYING A TIRE BAND ON SAID CYLINDRICAL SURFACE WITH ONE AXIAL END OF THE TIRE BAND SPACED AXIALLY BEYOND SAID ONE BEAD HOLDER BY A DISTANCE A EQUAL TO THE LENGTH OF THE AXIAL END PORTION OF THE TIRE BAND TO BE FOLDED AROUND A BEAD RING; C. LOCATING A BEAD RING AROUND THE TIRE BAND AT SAID DISTANCE FROM SAID ONE AXIAL END OF SAID TIRE BAND AND AXIALLY FIXING THE TIRE BAND TO SAID ONE BEAD HOLDER BY EXPANDING SAID ONE BEAD HOLDER AND THEREBY CLAMPING SAID TIRE BAND AGAINST SAID BEAD RING; D. AXIALLY MOVING APART SAID BEAD HOLDER AND THEREBY CORRESPONDINGLY SPACING THE OTHER BEAD HOLDER FROM THE REMAINING FREE AXIAL END OF THE BAND; E. LOCATING A FURTHER BEAD RING AROUND THE TIRE BAND IN RADIAL OPPOSITION TO SAID OTHER BEAD HOLDER AND EXPANDING SAID OTHER BEAD HOLDER AND THEREBY CLAMPING SAIA TIRE BAND AGAINST SAID FURTHER BEAD RING; F. INTRODUCING A COMPRESSED GAS INTO THE CHAMBER FORMED BY THE TWO BEAD HOLDERS AND THE TIRE BAND WHILE SIMULDTANEOUSLY REDUCING THE ACIAL SEPARATION BETWEEN SAID BEAD HOLDERS AND THEREBY FORMING THE SUBSTANTIALLY CYLINDRICAL TIRE BAND INTO A SUBSTANTIALLY TOROIDAL SHAPE.
Claim 3
Dependent Claim
90 words
Method of claim 1 in which said substantially continuous cylindrical surface includes both bead holders and said extension drum, said laying of said tire band on said cylindrical surface including laying said other axial end of said tire band on said extension drum and at a spacing from said other bead holder substantially exceeding said distance a, wherein said tire band is asymmetrically located with respect to said bead holders, and substantially continuously supporting said tire band axially from end to end thereof on said bead holders and extension drum.
Claim 4
Dependent Claim
56 words
The method of claim 2 in which said axially moving apart of said bead holders includes axially relatively sliding an intermediate portion of said tire band off said other bead holder and extension drum as said bead holders separate and substantially symmetrically locating the central portion of said tire band axially between the separated bead holders.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |