US4064215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing pneumatic tubular tires
Assignee: Bridgestone Corp
•
Filing: 1976-03-08
•
Granted: 1977-12-20
•
Expires: 1996-03-08
Abstract
Abstract A tubular tire for bicycle, automobile and the like, having a tubular cross section and comprising a tread portion, side portions and a bottom portion, is manufactured by molding a base tire composed of the side portions and the bottom portion from a fluidizable high polymer material by means of a split mold assembly and then molding the tread portion and hence a tire product from a fluidizable high polymer material by means of a centrifugal molding machine. The split mold assembly comprises a core having an outer peripheral surface coincident with an inner profile of the base tire and separable mold members having an inner peripheral surface coincident with an outer profile of the base tire.
Inventors
- 👤 Jumei Halada
- 👤 Hiromi Akiyoshi
- 👤 Tsutomu Matsunaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:03
CPC Classifications
B; B29; B29C; B29C41/00; B29C41/02; B29C41/04; B29C41/042; B29C41/047; B29C41/20; B29C43/00; B29C43/32; B29C43/36; B29C43/42; B29D; B29D30/00; B29D30/06; B29D30/0679; B60; B60C; B60C3/00; B60C3/02; B29C39/00; B29L; B29L2030/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
253 words
A method of manufacturing a pneumatic tubular tire having a tubular cross section in a radial direction of the tire and comprising a tread portion, side portions and a bottom portion, comprising the steps of: 1. coaxially aligning a core of a split mold assembly having an outer peripheral surface coincident with an inner profile of a base tire composed of the bottom portion, contiguous side portions and a continuous opening corresponding to the tread portion in a circumferential direction of the tire, within separable mold members of the split mold assembly having an inner peripheral surface coincident with an outer profile of the base tire to define a first molding cavity therebetween; 2. molding a fluidizable high polymer material, selected from the group consisting of polyurethane-based polymers, thermoplastic resins, thermoset resins, natural rubbers and synthetic resins, in the first molding cavity to form the base tire; 3. separating the separable mold members and core to remove the molded base tire; 4. setting the molded base tire within a tread ring of a centrifugal molding machine having an inner peripheral surface corresponding to an outer peripheral surface of the tread portion and part of the side portions to define a second molding cavity in the continuous opening; 5. pouring a fluidizable high polymer material of a low viscosity thermoset resin selected from the group consisting of polyether urethane resins and polyester urethane resins into the second molding cavity by centrifugal force to mold the tread portion and hence produce a final tire; and
Claim 2
Independent Claim
253 words
A method of manufacturing a pneumatic tubular tire having a tubular cross section in a radial direction of the tire and comprising a tread portion, side portions and a bottom portion, comprising the steps of: 1. coaxially aligning a core of a split mold assembly having an outer peripheral surface coincident with an inner profile of a base tire composed of the bottom portion, contiguous side portions and a continuous opening corresponding to the tread portion in a circumferential direction of the tire, within separable mold members of the split mold assembly having an inner peripheral surface coincident with an outer profile of the base tire to define a first molding cavity therebetween; 2. molding a fluidizable high polymer material, selected from the group consisting of polyurethane-based polymers, thermoplastic resins, thermoset resins, natural rubbers and synthetic resins, in the first molding cavity to form the base tire; 3. separating the separable mold members and core to remove the molded base tire; 4. setting the molded base tire within a tread ring of a centrifugal molding machine having an inner peripheral surface corresponding to an outer peripheral surface of the tread portion and part of the side portions to define a second molding cavity in the continuous opening; 5. pouring a fluidizable high polymer material of a low viscosity thermoset resin selected from the group consisting of polyether urethane resins and polyester urethane resins into the second molding cavity by centrifugal force to mold the tread portion and hence produce a final tire; and
Claim 3
Dependent Claim
14 words
removing the tire product having a desired tubular cross section from the tread ring.
Claim 4
Dependent Claim
14 words
removing the tire product having a desired tubular cross section from the tread ring.
Claim 5
Dependent Claim
32 words
A method as claimed in claim 1, wherein said tread portion and bottom portion are reinforced with one or multi layers of non-woven fabric or cord made from synthetic or metallic fibers.
Claim 6
Dependent Claim
16 words
A method as claimed in claim 1, wherein said side portions are reinforced with bead wires.
Claim 7
Dependent Claim
24 words
A method as claimed in claim 1, wherein the molding of said base tire in the step (2) is carried out by injection molding.
Claim 8
Dependent Claim
27 words
A method as claimed in claim 1, wherein said method further comprises the step of after-vulcanizing the molded tubular tire in an oven to effect complete curing.
Claim 9
Dependent Claim
33 words
A method as claimed in claim 1, wherein said core is composed of a plurality of separable core segments having an outer peripheral surface coincident with an inner profile of a base tire.
Claim 10
Dependent Claim
30 words
A method as claimed in claim 1, wherein said core is composed of a single core having an outer peripheral surface coincident with an inner profile of a base tire.
Claim 11
Dependent Claim
31 words
A method as claimed in claim 1, wherein said core, separable mold members and tread ring are made from metallic rigid materials of steel for ordinary sturcture or aluminum alloy, respectively.
Claim 12
Dependent Claim
21 words
A method as claimed in claim 1, wherein said core is made from an elastomeric material having a relatively hard surface.
Claim 13
Dependent Claim
23 words
A method as claimed in claim 1, wherein said tread ring in the step (5) is rotated at a rate of 100-1,000 r.p.m.
Claim 14
Dependent Claim
17 words
A method as claimed in claim 1, wherein said tread ring is provided with a locating ring.
Claim 15
Dependent Claim
24 words
A method as claimed in claim 1, wherein the molding of said base tire in the step (2) is carried out by compression molding.
Claim 16
Dependent Claim
24 words
A method as claimed in claim 1, wherein the molding of said base tire in the step (2) is carried out by transfer molding.
Claim 17
Dependent Claim
24 words
A method as claimed in claim 1, wherein the molding of said base tire in the step (2) is carried out by centrifugal molding.
References Cited (Backward Citations)
US2860379A
Cited
US3200180A
Cited
GB1246471A
Cited
US3645655A
Cited
US3686389A
Cited
US3976739A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-19 | 1981-06-20 | 1981-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-19 | 1985-06-20 | 1985-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-19 | 1989-06-20 | 1989-12-20 | $7700.00 | Window Closed / Lapsed |