U.S. patent number 3,914,487 [Application Number 05/409,271] was granted by the patent office on 1975-10-21 for fabric with discrete spaced projections of synthetic plastic material.
Invention is credited to Claude Azoulay.
United States Patent |
3,914,487 |
Azoulay |
October 21, 1975 |
Fabric with discrete spaced projections of synthetic plastic
material
Abstract
A stretch fabric has bonded to it a plurality of discrete spaced
projections of synthetic plastic material which project from a
surface of the fabric and are advantageously of cellular plastic
material imparting to those portions of the fabric which are
provided with them an anti-slip or skid characteristic.
Inventors: |
Azoulay; Claude (92100
Boulogne, FR) |
Family
ID: |
9106060 |
Appl.
No.: |
05/409,271 |
Filed: |
October 18, 1973 |
Foreign Application Priority Data
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|
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|
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Oct 23, 1972 [FR] |
|
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72.37489 |
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Current U.S.
Class: |
428/93; 428/79;
428/318.8; 428/141; 428/197 |
Current CPC
Class: |
A41D
31/00 (20130101); Y10T 428/23964 (20150401); Y10T
428/24355 (20150115); Y10T 428/24818 (20150115); Y10T
428/249989 (20150401) |
Current International
Class: |
A41D
31/00 (20060101); B32b 003/10 (); B32b 003/14 ();
B32b 003/16 () |
Field of
Search: |
;161/36,159,164,160,89,40,39,167,168,406,16,19 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Weinblatt; Mayer
Assistant Examiner: Buffalow; Edith R.
Attorney, Agent or Firm: Striker; Michael S.
Claims
What is claimed as new and desired to be protected by Letters
Patent is set forth in the appended claims:
1. An article of manufacture composed essentially of stretch
fabric; and a plurality of discrete spaced anti-skid projections
consisting of expanded synthetic plastic foam material bonded to
said fabric and projecting from only one surface thereof, said
projections having uncovered high-friction faces of said material
which are to contact a surface with respect to which skid
protection is to be obtained, whereby the anti-skid characteristic
of said stretch fabric and the stretching characteristic of said
stretch fabric do not interfere with one another.
2. An article as defined in claim 1, wherein said expanded plastic
material is expanded polyvinylchloride.
3. An article as defined in claim 1, wherein said projections are
of cellular synthetic plastic material having an integral
non-cellular uncovered surface.
4. An article as defined in claim 1, wherein said stretch fabric is
a knit fabric.
5. An article as defined in claim 1, wherein said stretch fabric is
a double-knit fabric.
6. An article as defined in claim 1, wherein said projections are
of substantially bead-shaped outline.
7. An article as defined in claim 1, wherein said stretch fabric is
knitted terry-cloth.
8. An article as defined in claim 1, wherein said expanded
synthetic plastic material is cast expanded PVC and said
projections have non-cellular integral exposed surfaces.
9. An article as defined in claim 1, wherein some of said synthetic
plastic material of each projection penetrates interstices of said
stretch fabric.
10. An article of manufacture, composed essentially of a textile
fabric; and a plurality of discrete spaced projections consisting
of expanded synthetic plastic foam material having a high
coefficient of friction, said projections being bonded to said
fabric, projecting from only one surface thereof and having
integral uncovered surfaces adapted to engage a surface on which
skid-protection is to be obtained, whereby the anti-skid
characteristic of said textile fabric and the stretching
characteristic of said textile fabric, do not interfere with one
another.
11. An article as defined in claim 10, wherein said fabric is a
stretch fabric.
12. An article as defined in claim 10, wherein some of said
synthetic plastic material of each projection penetrates
interstices of said textile fabric.
Description
BACKGROUND OF THE INVENTION
The present invention relates generally to a fabric, and more
particularly to a fabric having a plurality of discrete spaced
projections of synthetic plastic material which are bonded to and
project from a surface of the fabric.
There are many instances where it is important to impart to a
fabric anti-skid or anti-slipping characteristics. The term
"fabric" is employed in this disclosure is intended to refer to
fabrics in general, although the invention is applicable with
particular advantage to stretch fabrics, such as single knits and
double knits, to mention only two possibilities.
One instance where the provision of anti-skid characteristics on a
fabric is very important is in connection with so-called "baby
sleepers," or "baby crawlers." These are usually made from a knit
fabric, being in effect one-piece suits which are provided on the
legs with foot portions into which the foot of the child is
intended to fit. If the garment is made of a non-stretch fabric,
then of course the desired anti-skid characteristic which should be
imparted to the soles of the foot portions can be provided simply
by depositing a layer of synthetic plastic or the like on the sole.
This assumes, however, that the foot portion is large enough so
that it does not become stretched as the foot of the child is
inserted into it. Under those circumstances, a non-stretch fabric
can be satisfactorily coated with a synthetic plastic or the like
which affords it the desired anti-skid characteristics.
The situation is different, however, if the fabric is a stretch
fabric, for instance a single knit, a double knit, a knitted terry
cloth or the like. With this type of fabric the appeal of the
garment is, of course, that the fabric is capable of stretching.
This means that the provision of anti-skid characteristics to the
fabric must not interfere with the stretching of the fabric itself.
Evidently, if a layer of synthetic plastic or the like is applied
to the soles of the feet of a baby sleeper which is made of a
stretchable fabric, the insertion of the child's foot into the foot
portion of the garment, with the resultant stretching of the
garment material, will cause the layer of synthetic plastic to
tear, unless the layer is strong enough to prevent this, in which
case it will also prevent the desired stretching of the fabric
itself.
Similar circumstances obtain in other applications, for instance if
anti-skid properties are to be imparted to the elbows or knees of a
garment, to a bath mat which may be of knitted terry cloth, or the
like.
SUMMARY OF THE INVENTION
It is, accordingly, an object of the present invention to overcome
the disadvantages of the prior art.
More particularly, it is an object of the present invention to
provide an improved article of manufacture which does not possess
these disadvantages.
Still more particularly, it is an object of the present invention
to provide such an article of manufacture wherein the
stretchability of the fabric itself remains unchanged, while at the
same time the fabric has anti-skid properties imparted to it.
In keeping with the above objects, and with others which will
become apparent hereafter, one feature of the invention resides in
an article of manufacture which, briefly stated, comprises a
stretch fabric, and a plurality of discrete spaced projections of
expanded synthetic plastic material which are bonded to the fabric
and project from a surface thereof. These projections have
anti-skid properties and thus afford the article the desired
anti-skid characteristics without, however, in any way
disadvantageously influencing the stretch capability of the fabric.
This is so because the projections are spaced apart from one
another and are discrete projections, rather than being in form of
a continuous layer of synthetic plastic material. Moreover, because
the projections themselves can be somewaht deformed when weight is
placed upon them, or can even slightly "tilt" as the child walks or
crawls, or as the user of the article performs some other movements
which could cause such tilting, the anti-skid characteristics are
further enhanced.
The novel features which are considered as characteristic for the
invention are set forth in particular in the appended claims. The
invention itself, however, both as to its construction and its
method of operation, together with additional objects and
advantages thereof, will be best understood from the following
description of specific embodiments when read in connection with
the accompanying drawing.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a top-plan view showing an article according to the
present invention;
FIG. 2 is a vertical section through an apparatus for making the
novel article, and showing the article being made; and
FIG. 3 is a fragmentary vertical section through a completed
article according to the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Discussing the drawing in detail, and referring firstly to FIG. 1
thereof it will be seen that I have shown an exemplary article
according to the present invention in that Figure. Reference
numeral 1 identifies a fabric, and in particular a stretch fabric
such as a single knit fabric, a double knit fabric, a knitted terry
cloth, a stretch-nylon fabric or a Banlon (TM) fabric. Of course,
there are other stretch fabrics which have not been specifically
mentioned herein, but which should be understood to be similarly
suitable for purposes of the present invention.
Bonded to the fabric 1 is a plurality of discrete spaced
projections of expanded synthetic plastic material, i.e., foam
material. I have taken this opportunity to show different geometric
shapes of these projections, round ones being identified with
reference numeral 2, diamond-shaped ones with reference numeral 3,
star-shaped ones with reference numeral 4 and zigzag-shaped ones
with reference numeral 5. It will be understood, of course, that
other shapes are fully conceivable, for instance ring shapes or the
like, and are intended to be included in the protection afforded
the invention. It will also be understood that any single type of
geometric configuration or any desired combination of them, can be
employed.
FIG. 2 shows diagrammatically an apparatus for bonding the
projections 2, 3, 4 or 5 to the fabric 1. The latter is again
identified with reference numeral 1, and it will be seen to have
disposed on its exposed surface (with its upper surface the fabric
1 rests on a table or plate 6) a layer 7 of synthetic plastic foam
material, that is a layer of expanded synthetic plastic material.
Located above the support 6 and the fabric 1 with the layer 7
thereon, is a platen 10 mounted on a support 11 which can be moved
upwardly away from and downwardly towards the fabric 1 and foam 7.
The side of the platen 10 which faces the support 6 is formed with
a plurality of projections having the illustrated configuration and
cross-sectional shape. The elements 10 and 11 can be heated in
suitable manner, for instance by having resistance wires embedded
in the elements 9 and/or 11, or in other suitable manner, by
circulating heated fluid through them, or by means of RF energy, to
name some possibilities. In any case, when the elements 10 and 11
are brought down under pressure onto the layer 7, the projections
of the platen 10 will cut through the layer 7 but they are so
selected as to their length that they will not cut into or through
the fabric 1. Since the platen and its projections are heated,
those portions of the foam layer 7 which are located beneath the
lower free end faces of the projections will be heated and
temporarily melted so that their material can penetrate the
interstices of the fabric 1 and become bonded to the same as the
material of the layer 7 subsequently solidifies again.
Those portions, identified with reference numeral 8 in FIG. 2,
which are located within the confines of the respective projections
(which in cross-section should be understood in FIG. 2 to be
circular to render the configuration of the projections which is
identified with reference numeral 2 in FIG. 1) will thus become
bonded to the fabric 1 and will form the circular projections 2,
which are also shown in the fragmentary vertical section of FIG. 3
which is taken through the completed article composed of the fabric
1 and the projections 2.
Those portions 9 of the foam layer 7 which are located outside and
intermediate the projections of the platen 10, will not have been
bonded to the fabric 1 and can be removed when the platen 10 is
subsequently raised again. In this connection it should be pointed
out that it is entirely conceivable to make the elements 10 and 11
stationary and to raise and lower the support 6 until the desired
bonding is achieved.
Insofar as the material of the layer 7 is concerned, it is pointed
out that in the first place it must be a thermoplastic material
since it must be capable of being rendered bondable with the fabric
1 under the heat of the platen 10. Furthermore, it is an expanded
synthetic plastic material, for instance a foam plastic, and
expanded PVC has been found to be particularly advantageous. Since
it is desirable that the exposed surface of the projections 2-5,
that is the surface which faces away from the fabric 1, be not
cellular but be continuous and non-cellular, it is advantageous if
so-called "cast foam" is used. Such foam is made by pouring
foamable plastic onto a release paper or the like, and allowing the
layer to foam. Industry", of the layer with the release paper, that
is the contact at the interface between the release paper and the
foam plastic layer, prevents the formtion of cells at the surface
of the foam layer which engages the release paper, thus forming a
"skin" on this surface, whereas the remainder of the layer is of
cellular structure throughout. Details of this and other types of
foam production, and general details concerning the suitability of
various types of synthetic plastic foam material, may be obtained
from the "Plastics Engineering Handbook of the Society of the
Plastics Industry," Inc., Third Edition, Reinhold Publishing
Corporation, New York.
In any case, the projections 2 (or the projections 3-5) will have
the desired anti-skid property, due to the material of which they
are made. Their surfaces will have a high coefficient of friction,
and the anti-skid property is further enhanced by the fact that
when weight is placed upon the projections 2 they tend to be
compressed resiliently due to the fact that they are of expanded
synthetic plastic material. On the other hand, they do not
interfere with the stretching of the material of the garment or
fabric 1, since they are discrete projections which are spaced from
one another and do not adhere or cohere with one another but only
to the fabric 1. It is of course evident that the exposed surfaces
of the projections must not be covered over, e.g., with another
layer of plastic material as is known from the prior art, since the
desired anti-skid properties depend upon the direct contact of
these surfaces with the floor or other support with reference to
which sliding is to be prevented.
It will be appreciated that the use of these projections is by no
means limited merely to baby garments. As already pointed out
earlier, it is possible to provide areas which are treated to have
the desired anti-skid properties, by having the respective
projections 2-5 or others applied to them, on the elbows of
garments, on the knees of garments, on the shoulders of garments to
serve as gun cushioning in order to prevent slippage of a gun
during recoil of the latter, or bath mats, and in other
applications. It is possible, for instance, to provide these
projections on work clothes where the anti-skid properties are
desired. It is also possible to provide them on the seat of
ski-pants, in order to act in effect as "brakes" in the event a
skier should take a fall, so that he will not readily slip on ice
or the like. In fact, the range of possibilities for the
application of the present invention is exceedingly large as the
above few examples clearly illustrate.
Of course, the anti-skid properties are primarily due to the fact
that the projections 2-5 are of expanded synthetic plastic
material, that is foam plastic material, although as pointed out
earlier the compressibility of the foam plastic material does
contribute to some extent. Such material does per se have a high
coefficient of friction and thus affords the desired anti-skid
properties. By contrast to the prior art, where it is for instance
known to provide an applique of desired shape to a garment or the
like, the projections according to the present invention have their
surfaces which face away from the fabric 1, exposed so that they
can contact an upper surface with respect to which the fabric 1 is
to exhibit anti-skid properties. The prior-art proposals for
appliques either use plastic projections which have a smooth
surface and do not employ foam at all, or they use a smooth layer
of sheet vinyl or the like, which is bonded to a fabric and a layer
of synthetic plastic foam material is sandwiched between the smooth
layer of sheet vinyl or the like and the fabric. In the latter
case, however, the foam material serves only as a cushion, that is
as a padding which permits three-dimensional effects to be obtained
with the appliques. It does not have any possibility of acting in a
friction-promoting capacity, because it is covered up by the very
smooth vinyl or other sheet material.
Actually, however, I have even found that irrespective of whether
the surfaces of the projections 2-5 are smooth or rough, they will
serve to impart an anti-skid characteristic to the finished
article, as long as the projections are of expanded plastic and
their surfaces are uncovered. Evidently, this eliminates plastics
which are not in foam form, but as long as the plastic of the
projections 2-5 is an expanded plastic, the surface contour of the
respective projections 2-5 is immaterial, which means that it is of
no consequence whether the exposed surfaces of the projections are
smooth or have been contoured so as to be non-smooth or rough. The
fact that the projections are of expanded plastic, and that their
exposed surfaces which are to contact the floor or the like are not
covered by other material that can detract from their anti-friction
properties, will in and of itself assure that they afford the
desired anti-skid properties.
I wish it to be understood that the invention, although
particularly suitable for use with stretch fabrics, can also be
used with non-stretch fabrics. If so, it will be appreciated that
the degree of anti-skid protection afforded by the projections 2-5
of the present invention will be the same as that which is afforded
if the fabric 1 is a stretchable fabric. Of course, the
consideration of not wishing to interfere with the stretching of
the fabric would not apply under these circumstances, but the
consideration of affording anti-skid protection would still exist
and be highly advantageous.
It will be understood that each of the elements described above, or
two or more together, may also find a useful application in other
types of applicants differing from the types described above.
While the invention has been illustrated and described as embodied
in an article of manufacture, it is not intended to be limited to
the details shown, since various modifications and structural
changes may be made without departing in any way from the spirit of
the present invention.
Without further analysis, the foregoing will so fully reveal the
gist of the present invention, that others can be applying current
knowledge readily adapt it for various applications without
omitting features that, from the standpoint of prior art, fairly
constitute essential characteristics of the generic or specific
aspects of this invention and, therefore, such adaptations should
and are intended to be comprehended within the meaning and range of
equivalence of the following claims.
* * * * *