US3849220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making cordless tires
Assignee: Bridgestone Corp
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Filing: 1971-12-21
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Granted: 1974-11-19
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Expires: 1991-12-21
Abstract
Abstract A method for making a cordless tire with a hollow tubular hub whose longitudinal axis is aligned with the axis of rotation of the tire. The method comprises steps of forming a pair of outwardly extending annular flanges at the opposite ends of the tubular hub, forming a disk flange at the central portion of the tubular hub at right angles to the axis of rotation of the tire, extending a hollow rubber shell from one of the outwardly extending annular flanges to the opposite annular flange, shaping an expanded ring portion within the shell in the proximity of each of the annular flanges, bonding the rubber shell to the hub while strengthening the bond of the shell to the annular flange by said expanded ring portion so as to form a tire case, molding and vulcanizing the tire case in a two-half mold assembly.
Inventors
- 👤 T Arai
- 👤 Y Suzuki
- 👤 I Arimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:22
CPC Classifications
B; B29; B29D; B29D30/00; B60; B60C; B60C15/00; B60C15/02; B60C15/036; B60C5/00; B60C5/01; B29D30/06; B29D30/08; B29D2030/084
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
295 words
A method for making a cordless tire having a hollow cylindrical metal hub with a longitudinal center line coinciding with the axis of rotation of the tire and a pair of outwardly extending annular flanges integrally formed with said hub at the longitudinally opposite ends thereof, and a shaped rubber shell extending from one of the pair of annuLar flanges to the other, the cylindrical hub having at its bottom a disk flange located between the pair of annular flanges and extending at right angles to the axis of rotation of the tire, said method comprising the steps of forming two halves of the rubber shell of the tire body as a as a whole by means of a mold assembly composed of two half molds separable in the axial direction of internal cavities thereof and an annular core to be inserted into said cavities, each of said half shells extending from one of said annular flanges to the peripheral center line of the tire, and having along the peripheral center line annular lugs made integral with the side edges of the half bodies opposite to the hub members and bonded to form an annular ridge, bonding the flange side edge of each half shell to the corresponding annular flange of the corresponding hub by snugly fitting a cylindrical stud made integral with each of the two half molds in the corresponding hub, bonding the annular lugs along the peripheral center line of the two half shells to each other to form an annular ridge and form a tire case having a rubber shell integral with the hub, and vulcanizing the tire case thus formed in the mold by pressurizing the inside space of the tire defined by the rubber shell and the cylindrical hub.
Claim 2
Independent Claim
295 words
A method for making a cordless tire having a hollow cylindrical metal hub with a longitudinal center line coinciding with the axis of rotation of the tire and a pair of outwardly extending annular flanges integrally formed with said hub at the longitudinally opposite ends thereof, and a shaped rubber shell extending from one of the pair of annuLar flanges to the other, the cylindrical hub having at its bottom a disk flange located between the pair of annular flanges and extending at right angles to the axis of rotation of the tire, said method comprising the steps of forming two halves of the rubber shell of the tire body as a as a whole by means of a mold assembly composed of two half molds separable in the axial direction of internal cavities thereof and an annular core to be inserted into said cavities, each of said half shells extending from one of said annular flanges to the peripheral center line of the tire, and having along the peripheral center line annular lugs made integral with the side edges of the half bodies opposite to the hub members and bonded to form an annular ridge, bonding the flange side edge of each half shell to the corresponding annular flange of the corresponding hub by snugly fitting a cylindrical stud made integral with each of the two half molds in the corresponding hub, bonding the annular lugs along the peripheral center line of the two half shells to each other to form an annular ridge and form a tire case having a rubber shell integral with the hub, and vulcanizing the tire case thus formed in the mold by pressurizing the inside space of the tire defined by the rubber shell and the cylindrical hub.
Claim 3
Dependent Claim
69 words
A method of making a cordless tire according to claim 1, wherein said cylindrical hub is made of two cup-like halves and said half rubber shells are formed as integrally connected to said annular flanges of the two cup-like half hubs, respectively, and said peripheral center line edges of the two half rubber shells are bonded simultaneously with the bonding of the bottoms of the two cup-like half hubs.
Claim 4
Dependent Claim
64 words
A method of making a cordless tire according to claim 1 and further comprising a step of securing beforehand a bead rubber ring to the annular flange of each hub, respectively, prior to bonding the rubber shell to the hub, said bead rubber ring being made by using a rubber material which is bondable to said annular flange and to said half rubber shell.
Claim 5
Dependent Claim
50 words
A method of making a cordless tire according to claim 1 and further comprising a step of boring holes in each of said annular flanges so as to cause the rubber material of said rubber shell to penetrate through said holes when said rubber shell is bonded to said hub.
Claim 6
Dependent Claim
41 words
A method according to claim 1, wherein said vulcanization is effected while filling the inside space defined by the rubber shell and the hub with an inactive gas, said inactive gas reacting with neither of the hub and the rubber shell.
Claim 7
Dependent Claim
12 words
A method according to claim 5, wherein said inactive gas is air.
Claim 8
Dependent Claim
12 words
A method according to claim 5, wherein said inactive gas is steam.
Claim 9
Dependent Claim
13 words
A method according to claim 1, wherein said hub is made of steel.
Claim 10
Dependent Claim
22 words
A method according to claim 1, wherein said rubber shell is made of a rubber material which is reinforced by short fibers.
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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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |