Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1990-05-01
1992-03-31
Ball, Michael W.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
152539, 152540, 245 15, 428295, 156161, 156171, B29D 3048, B60C 1504
Patent
active
051004909
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to bead reinforcement construction and more particulary to the construction of an annular reinforced bead at an opening of a hollow article fabricated from flexible and/or resilient materials and the bead being of a kind adapted to be mounted on a rigid seat, e.g. of metal, to form an air seal therewith.
Examples of such articles are air springs, rolling lobe diaphragms and pneumatic tyres. A common element in the construction of such articles is a liner or carcass ply made from a sheet of a polymeric material in which reinforcing cords are embedded. This liner or ply is wrapped around a cylindrical former or mandrel to form a tube, a bead reinforcement is constructed near each end of the tube, other bead components such as (in the case of a pneumatic tyre) a bead filler or apex are wound over each bead construction and thereafter the ends of the tube projecting beyond the bead assemblies are turned up to fold over or lock into them. Also in the case of a pneumatic tyre the central part of the tube between the bead assemblies is then bowed outwardly to give the carcass ply a toroidal configuration, breaker, tread and sidewall components are added and the completed assembly is cured in a mould.
Bead reinforcements of inextensible material such as wire are necessary to preserve the predetermined diameter of each bead of the tyre enabling it to be seated on the respective flange of a wheel rim and resist unintended dismounting especially when the tyre is inflated. The wire is, however, sheathed in natural or synthetic rubber to prevent damage to the carcass ply wrapped around it and to form a consolidated strong loop. Bead reinforcements have been made from a simple loop of wire tape impregnated with rubber, i.e. a flat rubber strip in which plural, parallel wires are embedded. The overlapping ends of the loop, however, necessarily produce a circumferential unevenness in the finished bead which is pronounced because of the overlap of the tape end. Efforts to produce a less circumferentially uneven bead have included wrapping round the mandrel a single rubber sheathed wire in such a manner as to give a similar section or regular section with improved joint areas. According to United Kingdom Patent Specification GB-A-2179009 a reinforced bead for a pneumatic tyre may be constructed from superimposed layers of rubber-sheathed wire. This latter proposal has the advantage that the shape of the wound bead may easily be varied and both proposals have the advantage that the turned-up carcass ply may be embedded and trapped in the windings of the reinforced bead. However the versatility of the construction even of the latter proposal is limited by the fixed ratio between the volume of rubber and the volume of wire in the finished product imposed by the use of rubber coated wire. Variation of the configuration of the reinforced bead to meet different requirements is also limited by the use of sheathed wire having a predetermined rubber-to-wire volume ratio and spatial relationship.
A principal object of the present invention is to improve upon previous proposals by increasing design flexibility in a simple and cost-effective manner permitting the construction of improved bead reinforcements or bead reinforcements better adapted to particular design requirements.
In accordance with the present invention there is provided a method of constructing a bead reinforcement comprising wrapping around a mandrel or former in superimposed relation successive layers comprising respectively a first flat strip comprising uncured polymeric material and axially spaced-apart windings of an inextensible material, the inextensible material being wound under a tension such that the polymeric material enters the spaces between the axially separated windings annular assembly of the required diametral thickness and cross-sectional shape has been built up in which the polymeric material fills the spaces between the axially separated windings and the windings are surrounded by and embedded in the polymeric material
REFERENCES:
patent: 1046211 (1912-12-01), Milton
patent: 1681680 (1928-08-01), Pierce
patent: 4477301 (1984-10-01), Bouju
patent: 4823857 (1989-04-01), Orjela et al.
patent: 4967821 (1990-11-01), Holroyd et al.
Holroyd Eric
Wright Anthony R.
Ball Michael W.
Bridgestone/Firestone Inc.
Wilber Gregory J.
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