FR2583349A3 - PNEUMATIC ENVELOPE - Google Patents

Abstract

A TIRE WRAP INCLUDES A PERFORATION CLOSURE COATING FIXED ON THE INTERIOR SURFACE OF THE ENCLOSURE, THIS COATING CONSISTING OF FLEXIBLE 3 INTERLACED AND RUBBERED CABLES. THANKS TO THE FLEXIBILITY OF THE INTERLACED CABLES 3 AND THE ELASTICITY OF THE RUBBER, WHEN A POINTED OBJECT 6 PERFORES THE TIRE WRAP AND THE PERFORATION CLOSURE COATING, THE RUBBER CABLES 3 REACT BY BAGGGING AROUND THE TIRE POINTED OBJECT 6, IN ORDER TO PREVENT THE LEAK OF THE AIR CONTAINED IN THE TIRE CASE.

Description

PNEUMATIC ENVELOPE

  The present invention relates to an envelope of

  pneumatic tire, and in particular a tire casing

  a new type of perforation coating.

  The development of tires offering safety

  increased longevity plays an important role in

  the field of the automobile. The applicant finds that

  accidents, sometimes accompanied by injuries.

  very serious and even death, are due to the puncture

  followed by the bursting of tires. Even if such an

  this does not cause any injuries, it is always boring to have to put the broken tire

  spare wheel, or even to carry out emergency repairs.

  the extent of which depends on the importance of

tion.

  U.S. Patent 2,699,194, in the name of Iknayan, discloses

  tire casings of the general type previously

  known in which an inner tube is constituted

  webs spaced apart from rubberized fabric. Each tablecloth

  door parallel cables oriented in the same direction

  tion. One of the plies has cords oriented in a first direction, while the other ply has cords oriented at an angle of about 50 relative to this first direction. These known envelopes use the inner tube to tension a braking device

  in the envelope, and thus prevent the tire from bursting.

  US Patent 1,572,053, in the name of Villard, proposes to

  to size a shoe inside the casing, the initially inner surface of the shoe being placed in the outer position, which shoe consists of a body made

  essentially in an elastic material and which is exten-

  in conjunction with the inner surface of the enve-

  Loppe. If air is inside the tire

  escapes, the compressed pad will keep the tire in working order. US Patent 1,431,596, to Pixley, discloses a tire inner tube which is reinforced by an adequate number of layers of fabric over most of its transverse circumference, the reinforcing layers being arranged in such a way that There is a greater thickness of reinforcement and rubber in the area which is disposed in contact with the tread. US Pat. No. 919,915, in the name of Murphy, discloses an inner tube for automobile tires. The body of the inner tube is formed of one or more layers of partially elastic fabric, a

  rubber mix being inserted into the mesh of the

  su, to form an inner and outer lining of the fabric. UK Patent No. 15,640, Spencer, also discloses an inner tube for vehicle wheels

  automobiles. The air chamber proposed by Murphy is

  characterized by the presence of rubber on or near

  tees ends or edges of the band or web

  tissue, the thickness of which is thus increased, the circumferential band

  conferring rubber which is then added being made as thin as is possible to ensure the

necessary resistance.

  Although the above-mentioned prior patents have all proved satisfactory in providing the inner tube with the necessary strength, they all suffer from the same drawback, namely that once the inner tube is pierced by a sharp object, It is not possible to make a covering sealing the perforation around the object puncher able to maintain tight this object without

  only pressurized air escapes. It is therefore always

  necessary to resort to an emergency operation in order to

  to ensure the safety of the vehicle.

  The main object of the present invention is

  to provide a tire envelope with a coating

  sealing of perforations which allows to automatically seal a perforation by the commitment of cords

  flexible intertwined and rubberized around the object

  forateur. Another object of the invention is to provide

  a tire casing of a new type, which allows

  put to continue driving a long distance to the

  following the perforation of the tire by a pointed object.

  According to the present invention, the tire casing

  is characterized in that it comprises a coating

  shuttering of perforations consisting of cords

  trellised and rubberized, to which a tubular form is

  which extends over the inner surface of the enve-

  loppe of the tire after it has been filled with air.

  The following description details

  preferred embodiments of the invention, with reference to the appended drawing in which:

  Figure 1 is a perspective view of a pneumatic tire.

  that according to the present invention, in which are plugged several nails; Figure 2 is a cross-sectional view of an exemplary embodiment of the tire casing according to the present invention; Figure 3 is a cross-sectional view of a

  another embodiment of this tire envelope

  tick; Figure 4 is a partial sectional view along IV-IV of Figure 1, having a tire casing according to the present invention which has been perforated by a nail; and

  Figure 5 is a schematic view showing the effect of

  fet shutter provided by interlaced cords and

  when a nail pierces the shutter coating

  perforations of the tire casing according to

the present invention.

  FIG. 2 shows a preferred embodiment of a tire casing (1) provided with a

  covering (2) for closing the perforations according to the pre-

this invention.

  As the different figures show, the

  (2) sealing of the perforations consists of

  interwoven flexible cords (3) (see Figure 5), which are

  foamed and rubberized into a tubular shape of

258 -3349

  designed to be fastened to the inner wall of the tire casing (1), with or without interlaying of an adhesive, since, when inflated, the closure covering of the perforations will be stretched so as to be in close contact with the inner wall of the tire casing (1). The cords (3) chosen to be interleaved in sheet must be both flexible and resistant, so as to obtain, once the interlaced and rubberized cords, the desired cohesive strength for the fabric

of cords (3).

  The interwoven cord sheet is rubberized in a suitable tubular form and disposed within the tire casing (1). When the covering (2) for filling the perforations is filled with air,

  automatically molds to the inner surface of the envelope

pe (1) of tire.

  FIGS. 3 and 4 show that, when a pointed object, represented here by a nail (6), pierces the envelope (1)

  pneumatic tire and the coating (2) for filling the perforations

  rations, a little air escapes when the object

  you pierce the envelope, and the covering (2) shutter

  perforations react immediately to close the opening.

  ture. As best seen in Figure 5, the interwoven and rubberized cords (3) are able to glue rapidly around the nail (6). This fast action is due to the flexibility of interlaced cords, the elasticity

  high rubber content leading to almost instantaneous

  tane of the latter to its original state following its

  perforation and its local deformation by such a nail (6).

  Accordingly, the nail (6) is, as shown in Figure 4, held firmly by the cladding coating (2)

  perforations, consisting of cords (3) rubberized.

  FIG. 3 shows another exemplary embodiment of the present invention: the cover (2) for closing the perforations here comprises an annular portion (20) which,

  during the scrubbing of the sealing cover of perforations

  tions, is formed along the opposite edges (21) and (22) of S3349

  the latter to form an integral part.

  This annular portion (20) is made of a material made entirely of rubber, and is intended to be positioned directly on the rim area (5), since there is little chance that the annular portion (20) is

  at this point perforated by any sharp object.

  An attempt was made to determine the effectiveness of

  invention by the following procedure: seven nails of at least 38 mm (lx1 ") in length were inserted into the tire casing mounted on the rear wheel of a typical moped "Scooter 90" The distance between two adjacent nails was less than cm, the load of the moped being about 130 kg

  (driver + passenger). The pneumatic tire envelope

  ter was inflated to a pressure of 3 kg / cm 2. Following a road trip of about 60 km, the tire pressure being slightly less than 3 kg / cm 2, expected

  a slight escape of air occurs when

  of the tire the air pump tips and the mano

metre.

Claims (3)

  1- tire envelope having a surface   this interior comprising a tubular covering of closure   perforations extending over the entire surface of the   upper part of the casing, characterized in that the tubular covering (2) for closing the perforations consists of flexible cords (3) interwoven and rubberized, and is intended to be fixed on the inner wall of the tire casing ( 1), so that an object (6) perforating the casing (1) and the tubular covering (2) closing the perforations, and protruding between the cords (3), will be held tight by the cords (3). ) of the covering (2) closing the perforations, which will surround this object (6) to seal the perforation by preventing air from escapes.   2- tire casing having an inner surface according to claim 1, characterized in that the coating (2) for closing the perforations is assembled by adhesion to the wall of the inner surface. of the envelope (1).   3- tire envelope having an inner surface according to claim 1, characterized in that the coating (2) for closing the perforations comprises,   in addition, an annular portion (20) entirely made of rubber   which, during the exfoliation of the coating (2), is   along the opposite edges (21, 22) thereof to form an integral part, and which is intended to   to be positioned directly on a rim area (5).