Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
Reexamination Certificate
1995-12-15
2002-01-08
Knable, Geoffrey L. (Department: 1733)
Resilient tires and wheels
Tires, resilient
Pneumatic tire or inner tube
C152S543000, C152S548000
Reexamination Certificate
active
06336488
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a tubeless pneumatic tire and to a cylindrical noncord nonreinforced carcass subassembly
10
A for the pneumatic tire as an intermediate article of manufacture. The subassembly
10
A in its unvulcanized state is formed into a cylindrical shape at a tire building station and is a subassembly of a pneumatic tire. The invention is described in relation to a radial ply passenger tire, but it is applicable to light truck, medium truck, agricultural, off-road and other radial or bias ply tire constructions.
Historically, the pneumatic tire has been fabricated as a laminate structure of generally toroidal shape having beads, a tread, belt reinforcement and a carcass. The tire is made of rubber, fabric, and steel. The manufacturing technologies employed for the most part involve assembling the many tire components from flat strips or sheets of material. Each component is placed on a building drum and cut to length such that the ends of a component meet or overlap creating a splice.
In the first stage of assembly the carcass would include one or more plies, and a pair of sidewalls, a pair of apexes, an innerliner (for a tubeless tire), a pair of chafers and perhaps a pair of gum shoulder strips. Annular bead cores can be added during this first stage of tire building, and the ply or plies can be turned around the bead cores to form the “ply turnups.”
The carcass components (excluding the bead cores) would be either “butt spliced” or “lap spliced.” A butt splice has the component ends joined but not overlapped, a lap splice has overlapping ends.
This intermediate article of manufacture would be cylindrically formed at this point in the first stage of assembly. The cylindrical carcass is expanded into a toroidal shape after completion of the first-stage of tire building that results in such cylindrical intermediate article of manufacture. Reinforcing belts and the tread are added to the intermediate article during a second stage of tire manufacture, which can occur using the same building drum or work station or at a separate shaping station.
During the expansion of the carcass, tensile stresses are imposed on the spliced and uncured components of the tire carcass.
In the case of passenger tires, lap splices of the plies were preferred because the splice remained intact whereas butt splices would tend to open or fail. Butt splices were preferred for the commercial or medium truck tires. Even with the good adhesion of the lap splice the cords adjacent the splice tended to be stretched compensating for the overlapped two layers of cords at the splice. This localized stretching creates a nonuniformity that is readily visible under x-ray, ultrasonic display, or by physically cutting the tire and visually inspecting it.
The tire designer, in order to prevent the creation of tire uniformity problems, has historically insured that the splices of the various layers of components were not circumferentially aligned. This nonalignment of splice joints was believed to improve the carcass overall durability and uniformity, as measured by the amount of force variation and the balance of the tire. Tire engineers also have believed that tire uniformity could be improved if these discontinuities were deliberately circumferentially spaced around the carcass.
The subject matter of this patent application completely reverses this conventional wisdom as it relates to unreinforced subassembly construction. The unreinforced subassembly is manufactured with numerous components having a common splice line. The tire casing built with the subassembly according to the present invention can be built more efficiently while reducing splice-related nonuniformities.
SUMMARY OF THE INVENTION
An unvulcanized noncord reinforced subassembly
10
for incorporation in a tire casing as an intermediate article of manufacture, is disclosed. The subassembly has a liner having a pair of lateral ends defining the axial width (W
L
) of the liner and a plurality of elastomeric components attached to the liner or another of the elastomeric components. The plurality of elastomeric components includes a pair of chafers, one chafer being attached to and overlapping each of the lateral ends of the liner, a pair of sidewalls, each sidewall having a non-linear contoured profile on one surface, each sidewall being axially spaced from the liner and attached to and overlapping the chafer.
The liner and the elastomeric components have a pair of lateral ends defining the axial width (W) of the casing subassembly. The liner and the elastomeric components each have a predetermined cross-sectional profile having lateral edges at predetermined locations along the length of the casing subassembly. Each component is formed and attached while hot at the location where formed, thereby fixing the location of the lateral edges of each component to form a casing subassembly. The casing subassembly is adapted to be cut to length with common ends being spliced along a substantially flat plane, extending thus through the article across the axial width (W). The formed casing subassembly is adapted to accept a ply and a pair of annular bead cores positioned onto the casing subassembly at a latter stage of building the tire.
The above-described subassembly
10
is cut from a laminate
10
A. The laminate
10
A has at least two components laminated together, the components being selected from one or more of the component types consisting of a liner
50
, a chafer
60
, a sidewall
70
, a whitewall strip
80
, a cover strip
90
and a gum shoulder strip
40
. The laminate
10
A has a width (W), a pair of ends
12
,
14
, the distance between the ends defining the subassembly length (L). The components have common ends
12
,
14
spliced along a substantially flat plane (P), the plane (P) extending through the article across its axial width (W). The splice or flat plane (P) is inclined at an angle &thgr;, &thgr; being less than 90° and greater than 60° relative to a normal plane (NP) passing through the laminate and extending. In a preferred embodiment of the invention the splice or flat plane (P) is inclined at an angle &thgr; of about 80°. This orientation of the splice permits the ends
12
,
14
to have large uncured surface areas which upon assembly greatly increases adhesion of the joint. Ideally for manufacturing efficiency and improved product quality it is preferable that each of the components listed above in the quantities required to assemble the subassembly be spliced along a straight linear surface as described above.
REFERENCES:
patent: 1320121 (1919-10-01), Brucker
patent: 1353934 (1920-09-01), Morris
patent: 1667009 (1928-04-01), Matthias
patent: 1730307 (1929-10-01), Stevens
patent: 1770895 (1930-07-01), Abbott, Jr.
patent: 2724423 (1955-11-01), Harris
patent: 2754887 (1956-07-01), Wykoff
patent: 3027289 (1962-03-01), Gitzinger
patent: 3237673 (1966-03-01), Ward
patent: 3504710 (1970-04-01), Pancoast
patent: 3509929 (1970-05-01), Delobelle
patent: 4232723 (1980-11-01), Gazuit
patent: 4334448 (1982-06-01), Messerschmitt
patent: 4465536 (1984-08-01), Makino et al.
patent: 4466473 (1984-08-01), Matyja et al.
patent: 4733709 (1988-03-01), Lambillotte et al.
patent: 4768575 (1988-09-01), Bruner et al.
patent: 4810317 (1989-03-01), Lang
patent: 4877468 (1989-10-01), Siegenthaler
patent: 4946525 (1990-08-01), Aupic et al.
patent: 5004635 (1991-04-01), Griebling
patent: 5030079 (1991-07-01), Benzing, II
patent: 5059274 (1991-10-01), Kumagai
patent: 5062462 (1991-11-01), Rye et al.
patent: 5273601 (1993-12-01), Sergel et al.
patent: 5327353 (1994-07-01), Nagano
patent: 5328532 (1994-07-01), Azuma et al.
patent: 5513560 (1996-05-01), Downing et al.
patent: 5638732 (1997-06-01), Becker et al.
patent: 5762740 (1998-06-01), Benzino, II et al.
patent: 41755 (1962-07-01), None
patent: 3444612 (1986-12-01), None
patent: 3724784 (1989-02-01), None
patent: 0246497 (1987-11-01), None
patent: 0737564 (1995-12-01), None
patent: 0701887 (1996-03-01), None
patent: 865603 (1941-05-01), None
patent: 580838 (1946-09-01),
Head Williams James
Vannan Frederick Forbes
King David L
Knable Geoffrey L.
The Goodyear Tire & Rubber Company
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