US3853653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of tires
Assignee: Dunlop Ltd
•
Filing: 1972-02-18
•
Granted: 1974-12-10
•
Expires: 1992-02-18
Abstract
Abstract Method and apparatus for manufacture of radial ply tires. A hollow cylindrical carcass ply pocket is made up and the bead cores positioned thereon. The carcass ply region between the bead cores is then shaped into a toroid and the ply ends turned over the bead cores. During shaping the diamet
Inventors
- 👤 A Olbert
- 👤 G Mertens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:57
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06; B29D30/36; B29D30/08; B29D30/20; B29D30/32; B29D2030/3214; B29D2030/3221; B29D2030/3228; B29D2030/3235; B29D2030/3242; B29D2030/325
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
123 words
A method for building up a radial-ply tire comprising the steps of arranging a radial carcass ply pocket in a hollowcylindrical disposition, positioning a pair of bead cores in a mutually spaced relation radially outward of said carcass ply pocket, shaping the carcass ply region situated between the spaced bead cores into a toroid while simultaneously reducing said mutual spacing between said beads, limiting the radial expansion of the carcass to a smaller diameter compared to its final diameter thereby providing lateral bulges in the carcass sidewalls, turning-over the carcass ply ends about the bead cores, and fastening the carcass ply ends which are turned over the bead cores to the bulged-out carcass sidewalls, and subsequently releasing the diameter limitation on the carcass.
Claim 2
Independent Claim
123 words
A method for building up a radial-ply tire comprising the steps of arranging a radial carcass ply pocket in a hollowcylindrical disposition, positioning a pair of bead cores in a mutually spaced relation radially outward of said carcass ply pocket, shaping the carcass ply region situated between the spaced bead cores into a toroid while simultaneously reducing said mutual spacing between said beads, limiting the radial expansion of the carcass to a smaller diameter compared to its final diameter thereby providing lateral bulges in the carcass sidewalls, turning-over the carcass ply ends about the bead cores, and fastening the carcass ply ends which are turned over the bead cores to the bulged-out carcass sidewalls, and subsequently releasing the diameter limitation on the carcass.
Claim 3
Dependent Claim
52 words
A method as claimed in claim 1, wherein the step of limiting the radial expansion of the carcass is performed to provide a diameter which is a function of the desired size of the acute angle between the bulged-out carcass sidewall and the carcass ply ends which are to be folded over.
Claim 4
Dependent Claim
53 words
A method as claimed in claim 1, wherein the length of the line which limits the cross-sectional area of the carcass torus lying in one plane with the axis of rotation of the carcass is the same, after abolition of the diameter limitation, as in the case of limited diameter and bulged-out sidewall.
Claim 5
Dependent Claim
43 words
A method as claimed in claim 1 in which the spacing between the bead cores immediately prior to the folding-over of the carcass ply ends is selected substantially equal to the bead core spacing after mounting of the tire on a vehicle rim.
Claim 6
Dependent Claim
49 words
A method as claimed in claim 1 in which the building of the radial ply tire is effected in a single-stage location wherein after said step of releasing the diameter limitation of the carcass toroid, the step of applying tread to the carcass is performed at the said location.
Claim 7
Dependent Claim
45 words
A method as claimed in claim 1 in which the building of the radial ply tire is effected in a two-stage process wherein the carcass is conveyed from the first to the second build-up stage after the folding-over and fastening of the carcass ply ends.
Claim 8
Dependent Claim
28 words
A method as claimed in claim 6 in which the step of releasing the diameter limitation of the carcass toroid is performed only in the second building stage.
Claim 9
Dependent Claim
97 words
Apparatus for carrying out the method as claimed in claim 1, comprising an expansible building drum having means for positioning bead cores on a carcass ply pocket, an inflatable bag or diaphragm for shaping the carcass ply region situated between the bead cores into a toroid, means for folding-over the carcass ply ends about the bead cores, and an annular band which serves to limit the diameter of the carcass toroid during shaping and which is arranged concentric to the center axis of the building drum and symmetrically about the peripheral center line of the build-up drum.
Claim 10
Dependent Claim
40 words
Apparatus as claimed in claim 8, in which the annular band consists of at least two parts which are separable in a radial direction, wherein said two parts can be assembled concentrically of the drum and then releasably coupled together.
Claim 11
Dependent Claim
30 words
Apparatus as claimed in claim 8 in which the annular band is provided on the outer circumference with members for retaining and centering the band circumferentially of the tire carcass.
Claim 12
Dependent Claim
39 words
Apparatus as claimed in claim 8 in which the axial width of the annular band is smaller than the mutual spacing of the edges of the two folded-over carcass ply ends of a tire being built on the apparatus.
Claim 13
Dependent Claim
65 words
Apparatus as claimed in claim 8 in which the means for positioning of the bead cores consists of a pair of annular bead support members each having a groove therein to receive a bead, the diameter of said members being variable between the diameter of the unexpanded drum and a greater diamter, and said members being movable in the axial direction of the building drum.
Claim 14
Dependent Claim
32 words
Apparatus as claimed in claim 12 in which the device for folding-over the carcass ply ends comprises a pair of inflatable bags which are connected respectively with the annular bead support members.
Claim 15
Dependent Claim
34 words
Apparatus as claimed in claim 13 in which each said inflatable bag rests at least partly on a support region of the drum outer surface which support region is capable of being conically expanded.
References Cited (Backward Citations)
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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) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |