Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
Patent
1988-04-14
1989-09-05
Hoch, Raymond
Resilient tires and wheels
Tires, resilient
Pneumatic tire or inner tube
152538, B60C 918
Patent
active
048629391
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to reinforced articles. More particularly, the invention concerns articles having reinforcements, so-called "stiffening reinforcements," intended to stiffen one or more parts of such articles, each of these reinforcements being formed of at least one ply known as a "stiffening ply." Such articles can, for instance, be straps, tubes, conveyor belts and pneumatic tires.
In particular, the invention concerns pneumatic tires having a stiffening reinforcement intended to stiffen their crown so as to permit said crown to withstand the stresses resulting from travel. This reinforcement is referred to as the "crown reinforcement" below.
Every known stiffening ply has a generally substantially two-dimensional structure, in the form, for instance, of an assembly of stiffening cables arranged in a single thickness.
Such plies can be used as is for the production of pneumatic tires by building on a drum or by casting in a mold, as described, for instance in the Japanese Patent Application published after examination under No. 57-12 687 or in the European Application published under No. 5 423. In these processes, these plies are not disposed directly on the surface of the drum or mold, since the tires would in such case be of excessive fragility upon travel.
Furthermore, in order to impart the necessary mechanical properties to pneumatic tires, it is indispensable to arrange said plies at a given level within the thickness of the crown. These plies are therefore arranged on a material which has been previously placed on the surface of the drum or mold so that these plies are protected by a substantial thickness of material in the finished tires. These techniques lead to complicated and/or costly operations which result in variations in quality from one tire to the next during the course of manufacture.
In West German published patent application No. 28 30 331 it is proposed to povide these plies with spurs and then to arrange these plies in a mold in such a manner that the spurs rest against the surface of the core of the mold. The purpose hereof is to cover the plies on all sides by the poured material. The number of these spurs is necessarily limited, resulting in the formation of only a few zones of contact and large individual sections. This results in substantial discontinuities within the tire and risks of defective attachment. Furthermore, these spurs destroy the symmetry of revolution within the tire and the plies assume a practically prismatic shape.
All of these drawbacks are present even if the material which forms the spurs and the poured material are similar or identical and these drawbacks are the source of vibratory phenomena which impair both comfort and the life of the tire.
French published Patent Application No. 2 421 969 describes a fabric of three-dimensional structure having two groups of warp threads; the warp threads of a first group are distributed to form the body of the fabric, while the warp threads of the second group are distributed to form at least one separating woven ply. This fabric thus makes it possible to produce a system for connecting two materials of different nature without the products in question being in contact, in view of the presence of the separating ply. Such a fabric is not suited for the production of stiffening reinforcements for pneumatic tires.
French Patent Application No. 83-02 625 (which corresponds to U.S. Pat. Nos. 4,580,611 and 4,625,785) describes a stiffening ply intended to be used in a pneumatic tire, this ply being characterized by the fact that the ply is formed at least in part of a fabric having the following properties:
(a) the fabric has a three-dimensional body and stiffening threads arranged in the body and held by the body;
(b) substantially all the voids in the fabric are capable of being filled by at least one material which forms part of the structure of the tire.
This ply assures precise positioning of the stiffening threads in space within the tire, which makes it possible to produce tires of very uniform quality
REFERENCES:
patent: 697390 (1902-04-01), Beck
patent: 697391 (1902-04-01), Beck et al.
patent: 1285084 (1918-11-01), Evans
patent: 1756151 (1930-04-01), Gardiner
patent: 3000771 (1961-09-01), Runton
patent: 3197021 (1965-07-01), Williams
patent: 3205119 (1965-09-01), Paul
patent: 3900062 (1975-08-01), Neville et al.
patent: 3919018 (1975-11-01), Schroeder
patent: 4580611 (1986-04-01), Merle
patent: 4625785 (1986-12-01), Merle
Compagnie Generale Des Etablissements Michelin
Hoch Raymond
LandOfFree
Stiffening ply formed . . . methods for obtaining such articles does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Stiffening ply formed . . . methods for obtaining such articles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stiffening ply formed . . . methods for obtaining such articles will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-235532