FR2613604A1 - CUSHION HAVING VANDALISM PROTECTIVE ENVELOPE AND METHOD FOR MANUFACTURING THE SAME - Google Patents

Abstract

CUSHION WITH AN ENVELOPE CONTAINING A NETWORK OF RESISTANT MATERIAL PROTECTING AGAINST VANDALISM. THIS ENVELOPE 10 IS IN WOVEN MATERIAL OF WHICH PART OF THE CHAIN YARNS 12 AND PART OF THE WEFT YARNS 14 ARE REPLACED BY YARNS 16 MADE OF A STRONG MATERIAL. THE REPLACEMENT THREADS 16 INCLUDE A METAL CORE 20 AND A SHEATH 22 WRAPPING THIS CORE 20, THE CORE 20 BEING MOBILE AXIALLY RELATIVE TO THE SHEATH 22.

Description

Cushion having an envelope protecting against

  vandalism and method of manufacturing this cushion.

  The present invention relates to a cushion having a woven material envelope which has a network of resistant material protecting against vandalism, and also relates to a method of manufacturing this cushion. Vandalism is a serious problem in

  public transport, especially in sub-regions

  urban. It is constantly observed that the envelopes of the seat cushions of railway cars are

  covered with lacerations or are disemboweled. However, the

  placement of disemboweled seats is expensive.

  Patent FR-A-2,447,167 discloses an envelope in which the network protecting against vandalism consists of corrugated metal wires which are intertwined to form a fabric of

  bedspring. This network is joined to the envelope by a

  linkage. In the case of this known envelope, this bonding layer is cellular plastic. This

  plastic is placed between the envelope and the

  protecting against vandalism so as to coat

  the vertices of the waves of the intertwined wires. However, this requires a precise manufacturing process and thus

  a significant expense. In addition, the

  medium often produces stiffening

  gable of the envelope protecting against vandalism.

  Document DE-32 525 Ai describes a seat with

  both a frame and a base attached to this frame. The seat is in incombustible material. To ensure a certain seating comfort, the seat consists of a fabric made of

  special steel that is stretched between two longitudinal tubes

  of the frame. On this seat, all the warp and weft threads of the fabric are made of wire, so that the sitting comfort leaves something to be desired. Indeed, even if the special steel fabric has sufficient elasticity, the seat is hard or cold compared to a seat in

textile trim.

  A seat, support or sleeping surface formed of a lattice is known from document AT 198 914. At least some of the threads of this lattice consist of a metal core wrapped in a sheath.

  in plastic. This metal core can be a cable.

  This seating surface, op sleeping support is a

flat object and not a cushion.

  The object of the invention is to provide a cushion of the type indicated at the beginning which is protected against vandalism without affecting the textile qualities of its envelope, and to provide a manufacturing method.

of this cushion.

  The invention achieves this goal by virtue of the fact that the warp yarns and the weft yarns comprise an elastomeric yarn intended to increase the extensibility of the envelope; a part of the warp threads and a part of the weft threads of the woven material are replaced by threads made of the resistant material; that the replacement wires have a metal core and a sheath enveloping this soul; and that the soul

  is movable axially relative to the sheath.

  Depending on the intervals at which the warp and weft threads are replaced by replacement threads made of the resistant material, a vandal-proof casing is obtained whose elasticity and flexibility qualities expected from a cushion are imperceptibly altered or unaltered. For example, one in eight to ten of the warp and weft threads of the woven material of

  the envelope can be replaced by a substitute

  made of resistant material. It is naturally also possible to replace a smaller or larger proportion of the warp and weft threads by

  replacement wires made of resistant material.

  Because the core is movable relative to the sheath, the replacement wires protecting the casing against vandalism may not adversely affect the elasticity and thus the cushioning properties of the casing. In addition, one can choose the nature and the color of the sheath of the replacement wires so that they

  do not appear especially outward.

  The warp and weft threads of the material

  envelope woven fabric that includes elastomer yarn

  mother as well as the sheath that wraps the core of the replacement wires may consist of textile thread

protected against fire.

  The soul of the replacement wires of the envelope

  can include at least one thread. This soul can, however,

  must also be a cable. A cable compared to a single wire has the known advantage of giving greater mechanical strength and greater elasticity to the wire.

  replacement wire. The protection of the envelope

  the vandalism is thus improved.

  The sheath enveloping the soul of the replacement wires

  envelope is preferably made of textile yarn

  the braided. This textile thread can correspond to the threads

  warp and weft of the woven material of the enve-

cushion loppe of the invention.

  The method of the invention for the manufacture of a cushion of the type described above, in which a casing is placed in an expansion mold of shape corresponding to the cushion, after which is applied to the expansion mold a vacuum that sucks the envelope to apply it closely against the expansion mold, and a cellular plastic is then formed behind the envelope, is characterized: in that before

  of the envelope in the expansion mold and the applica-

  tion of the depression to this mold, the envelope is often

  heat treatment for contraction of the elastomer yarn of warp yarns and yarns

  frame; and in that during the application of the enve-

  loppe against the expansion mold, the core of the replacement son movable axially relative to the sheath executes in it a compensation movement. The contraction of the elastomer yarns of the warp yarns

  and frame produces an elastic extension of the enve-

  Loppe. The difference in length produced by the treatment

  between the elastomer wires and the metal core of the replacement wires is eliminated when the casing is placed in the expansion mold or during the application of the vacuum to the expansion mold by the new sliding of the soul of the replacement wires in its sheath and by the extension of the envelope. The soul of the replacement wires then has a flexibility or

  such flexibility that the envelope allows any defor-

  mation. The method of the invention makes it possible to manufacture

  a cushion that has sufficient softness and is comforta-

  corn. Due to the flexibility of replacement wires

  In the envelope, there is no difference in sitting compared to an envelope that does not have replacement wires of the type described above.

  therefore is not protected against vandalism.

  Other details, features and benefits

  from the following description of an example of

  realization of the envelope of the invention.

  The single figure attached is a representation

  enlarged portion of said envelope.

  In the figure, the cushion cover 10 comprises warp yarns 12, weft yarns 14, and replacement yarns 16. The replacement yarns 16 replace a portion of the warp and weft yarns 14. the figure shows an envelope 10 in which one of four weft yarns 14 and

  warp threads 12 is replaced by a replacement thread

  16. The warp yarns 12 and weft yarns 14 comprise

  an elastomer yarn 18 intended to increase the ex-

  In the figure, a warp yarn 12 and a weft yarn 14 are depicted at one end so that the elastomer yarn 18 and the continuous yarn 24 are visible. replacement

  16 comprise a metal core 20 and a sheath 22

  developing this soul 20; the core 20 is movable relative to the sheath 22. In the illustrated embodiment of the casing 10, the core 20 is formed of a cable. For

  show this cable, two ends of the souls 20 are represented

  defeated. For the same reason, two ends of sheath

are also represented defeated.

  The warp yarns 12 and weft yarns 14 of the enve-

  LOPPE 10 may be constituted for example by a continuous fire-protected textured fiber yarn 24 and an elastomeric yarn 18 twisted together to give a determined size. The replacement wires 16 may consist for example of a special steel cable surrounded by a continuous fiber braid

22 protected against fire.

  The envelope 10 of the invention gives a good

  protection against vandalism. A test of vandalism

  I am executed in the following manner.

  A tester takes a carpet knife having a cutting depth of 25 mm and, with the arm extended, stings with this knife with normal muscle strength in a cushion provided with the envelope of the invention and tries to cut it crosswise. Then try to fold the four open corners of the envelope and fire the cushion with a hot object. When the tester stitches into the envelope of the invention with the carpet knife, three impact locations are

possible.

  The carpet knife falls exactly on a cable; in this case, the tester can not press the

knife in the envelope.

  The carpet knife falls on the fabric between the replacement yarns of resistant material in a direction parallel to the yarns; in this case, the tester reaches with the knife only one depth of cut

  not more than 8 to 11 mm and can not cut further.

  If the knife falls between the replacement wires

  diagonally in relation to the wires, the depth of cut shall not exceed 14 to 20 mm and

  nor is it possible to cut more.

  An effective protective envelope is thus

  against vandalism and, if such an envelope is used for a cushion,

  a cushion protected against vandalism.

Claims (6)

  A cushion having an envelope (10) of woven material which comprises a network of a resistant material protecting against vandalism, characterized in that the warp threads (12) and the weft threads (14)   include an elastomeric yarn (18) for increasing   the extensibility of the envelope (10); in that a portion of the warp yarns (12) and a portion of the weft yarns (14) of the woven material are replaced by yarns (16) made of said strong material; in that the replacement wires (16) comprise a metal core (20) and a sheath (22) enveloping this   soul (20); and in that the core (20) is axially movable relative to the sheath (22).   2. Cushion according to claim 1, characterized   in that the warp threads (12) and the weft threads (14) consist of continuous filament yarns   (24) twisted with the elastomeric yarn (18).   3. Cushion according to claim 1, characterized   in that the core (20) comprises at least one wire.   4. Cushion according to one of claims 1 or   3, characterized in that the core (20) is a cable.   5. Cushion according to one of claims 1 to   4, characterized in that the enveloping sheath (22)   the core (20) is made of braided textile yarn.   6. Method of manufacturing a cushion according to   one of claims 1 to 5, wherein an envelope   pe is placed in an expansion mold of corresponding shape.   laying on the cushion, after which a depression is applied to the expansion mold which sucks the envelope to apply it tightly against the expansion mold,   and wherein a cellular plastic is then molded   behind the casing, characterized in that, before the envelope is placed in the expansion mold and the application of the depression to this mold, the casing   is subjected to a heat treatment for the contrac-   elastomer yarn (18) of the warp yarns (12)   and weft yarns (14); and in that during the   application of the envelope against the expansion mold,   the core (20) of the axially movable replacement wires (16)   relative to the sheath (22) executes therein a compensation movement.