U.S. patent number 3,898,750 [Application Number 05/338,916] was granted by the patent office on 1975-08-12 for universal size disposable shoe cover.
Invention is credited to Louis S. Epstein.
United States Patent |
3,898,750 |
Epstein |
August 12, 1975 |
Universal size disposable shoe cover
Abstract
This invention provides a unitary blank which is
rectangular-like in shape with the sides and the ends of the
rectangle being modified so that when the one end and part of the
sides are sewn together with an elastic thread in accordance with
this invention it is readily formed into a shoe cover which fits
snugly a large variety of sizes of shoes. The blank has, in effect,
three parts which are the top section, the bottom section and the
two side sections. The top section comprises two angularly flared
portions each portion extending from a point near the center of the
top and going toward its respective side section at a desired angle
as is explained hereinafter. The bottom section comprises two
rounded sections each extending toward the side section adjacent to
it, and the two side sections are portions each of which is in
effect a reversing curve joining the rounded bottom section with
its related top section. The portion of the blank that lies between
each of the top angularly flared portions is a rounded section.
When the blank is folded along its longitudinal axis and viewed in
the unsewn, folded plan position, the fold resembles the shape of a
shoe. In effecting sewing, the two top angularly flared sections
and the portion therebetween are made to lie in juxtaposition and
when in that position they are sewed together using an elastic
thread. The sewing is then continued around all of the other edges,
in effect gathering them together, the sewing being continued to
the place of beginning at the given angularly flared section,
thereby forming an enclosure which is serviceable as a shoe cover.
The two top angularly flared sections with the curved section
therebetween forms the toe portion of the shoe and the rounded
bottom sections that have been gathered together by the said sewing
form the heel section of the shoe. While the shoe cover of this
invention as described above may be used for many uses, one of the
preferred uses is as a disposable shoe cover in hospitals. For such
uses it is preferred to equip the shoe cover of this invention with
a conductive strip. This is readily done by sewing the conductive
strip to the side of the blank that will form the bottom of the
shoe, beginning at the toe section and running the strip as far
back as the heel section with a portion left over, which portion is
used to make contact with the wearer. That portion can be tucked
into the sock of the wearer, or it can be brought around and into
the inside of the cover and made a part of the inside heel or the
inside floor of the shoe for body contact. With such contact
electrical charges are eliminated by grounding the individual
wearing the shoe cover.
Inventors: |
Epstein; Louis S. (Wilmington,
DE) |
Family
ID: |
23326680 |
Appl.
No.: |
05/338,916 |
Filed: |
March 7, 1973 |
Current U.S.
Class: |
36/49;
36/7.1R |
Current CPC
Class: |
A43B
3/163 (20130101) |
Current International
Class: |
A43B
3/16 (20060101); A43b 003/16 (); A43b 023/00 () |
Field of
Search: |
;36/7.1R,7.3,47,48,49,11 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Lawson; Patrick D.
Attorney, Agent or Firm: Mortenson; C. Walter
Claims
I claim:
1. A blank for conversion to a shoe covering which blank comprises
a top section, a bottom section and two side sections, the top
section comprising two portions in its foremost part which portions
are joined by a substantially straight portion, each of said two
portions being angularly flared to its respective side section, the
bottom section comprising two portions each being rounded toward
its respective side section, the terminal of each rounded bottom
portion being joined to the terminal of its respective angularly
flared top portion through a curve comprising one of said
respective side sections which curve extends away from the center
of the blank.
2. A blank in accordance with claim 1 wherein said top section
contains in its foremost part arcuate sections contiguous with each
said respective side sections.
3. A blank in accordance with claim 1 in which each said curve
comprises a slight S curve.
4. A blank in accordance with claim 1 in which said top section
contains between the uppermost terminals of the angularly flared
portions a portion which comprises a slight curve running inwardly
toward the center of said blank.
5. A blank in accordance with claim 1 which has running along the
longitudinal axis of the blank and sewn to one side of the blank a
strip of material capable of conducting electricity.
6. A blank in accordance with claim 5 in which said strip is
narrow.
7. A blank in accordance with claim 5 in which said strip is
wide.
8. A blank in accordance with claim 7 in which said strip
approaches the one-third of the width of said blank.
9. A blank in accordance with claim 5 in which said strip runs from
the full length of the blank in sewn relationship therewith and
extends beyond the blank in unsewn relationship therewith.
Description
BACKGROUND OF THE INVENTION
The present invention is concerned with a disposable shoe covering
which can be economically made in such a fashion that it can
readily be used to cover a wide variety of sizes equally well. The
invention relates to such a shoe covering that additionally can be
used in hospitals to prevent and reduce contamination and can be
used effectively to prevent explosions in operating rooms through
the grounding of the individual wearing the cover of this
invention.
DESCRIPTION OF THE PRIOR ART
There are a large variety of patents in this field each of which
has its own particular feature, but none of which discloses the
shoe covering of this invention that is so adaptable to a wide
variety of sizes, effecting coverage equally well. It is well known
that shoe coverings can be provided of disposable materials to
prevent the accumulation of dirt and dust and microbes and the
like, thereby cutting down the spread of disease in hospitals and
similar institutions. It is also well known that shoe coverings can
be equipped with conductive strips to effect grounding of the
wearer of the covering, thereby cutting down or eliminating
explosions that have heretofore frequently occurred in operating
rooms due to sparks caused by discharge of static electricity.
One of the problems in the art of such shoe coverings is making
available to the users in a large variety of institutions the many
sizes that are encountered due to the wide variety of people
working in such places. Shoe coverings that are readily adaptable
to small shoes worn by females are urgently needed as well as shoe
coverings that are worn by males having much larger foot sizes. Of
course, a wide variety of different shoe coverings can be made
available and, indeed, are available. However, the expense involved
in the marketing and keeping an inventory of such materials tends
to defeat the purposes of the disposability of the shoe coverings.
Further complications arise with the turnover of personnel in the
various institutions. Still further, prior art devices that are
used to cover a variety of shoe sizes invariably involve
bunching-up of materials on the bottom part especially in the
smaller size uses. This knotting effect causes discomfort in
walking.
OBJECTIVES OF THE INVENTION
One objective of this invention is the provision of a disposable
shoe covering for shoes. Another purpose is to provide a disposable
shoe covering which is inexpensive and is readily made and which
will fit a wide variety of foot sizes.
A still further aim of this invention is providing a sanitary
covering for shoes which meet the above objectives and which
additionally prevents the occurrence of electrical build-up in or
on the body of the wearer which build-up is due to the friction
effects involved in one's moving around in such a room as an
operating room.
A further purpose is the provision of a shoe covering which has a
sole portion that lies substantially flat when in use.
These and other objectives appear below.
SUMMARY OF THE INVENTION
The above objectives of this invention are accomplished by the
provision of a blank or panel which has a certain shape that
affords its conversion to an enclosure by one simple sewing. A
partial fold of the blank is effected and at the meeting edges of
that partial fold an elastic thread is applied to form a seam and
this seam runs from the tip of the toe portion of the resultant
shoe to the end of the meeting sections of the partial fold and it
then continues around the other edges in a circular, non-seam
forming manner and coming back to the end of the said seam. The
non-seam forming sewing gathers the side and the heel sections of
the shoes together by virtue of the elasticity of the sewing
thread. The resultant shoe will stay in the very small form that is
created by the puckering of the elastic thread when the wearer
having a small shoe size uses this covering. However, when the user
is a person wearing a large shoe, the stretching of the covering
that occurs when that user places the covering of this invention
over his shoe results in the stretching of the entire covering in
all directions to cover the shoe adequately. In all cases the
bottom of the shoe covering is flat with excellent contact between
the floor and the bottom parts of the shoe.
This invention will be further understood by reference to the
figures given below along with the description which follows, all
of which is given for illustrative purposes and is not
limitative.
FIG. 1 is a perspective showing one embodiment of the foot covering
of this invention in position over the shoe of a given wearer with
the conductive strip in one position;
FIG. 2 is a top plan view of the embodiment of the foot covering of
this invention (shown in FIG. 1) in position over a shoe with the
conductive strip placed inside the shoe, the foot of the wearer
being absent;
FIG. 3 is a front view of said embodiment in position on a
shoe;
FIG. 4 is a rear elevation view;
FIG. 5 is a plan of the blank of this invention prior to its
formation into the enclosure and showing the conductive strip in
position.
FIG. 6 is a plan view of another embodiment of this invention as
the pattern or blank; and
FIG. 7 is a perspective showing the embodiment depicted in FIG. 6
in position over a wearer's shoe.
DESCRIPTION OF THE PREFERRED EMBODIMENT
With reference to FIG. 5 there is seen a pattern or blank 10 which
when sewn in accordance with this invention is readily converted to
the shoe covering 11 shown in FIGS. 1-4. The blank is, in effect, a
rectangular piece of material which has had its ends and its sides
modified. As can be seen at 12 and 13, one end, hereinafter
referred to as the top or toe end, has the corners cut off by the
angularly flared sections 12 and 13 each extending to its
respective side of the imagined rectangle. In between the portions
12 and 13 is the center section 14 which can be a fairly straight
section or it can be a rounded section as shown by line 15 in FIG.
6. This center portion actually in the resultant enclosure is the
portion that receives the toe or the toe portion of the shoe of the
user. The bottom section of the blank 10 shows the corners of the
imagined rectangle rounded off, the rounding being shown at 16 and
17. Here again, the modified bottom end of the rectangle extends
into the respective side sections. The bottom sections go to form
the heel portion of the covering. The side sections 18 and 19 are
in effect rounded or reverse curves joining the flared sections 12
and 13 (or 30 and 31 in FIG. 6) with their respective rounded or
joining sections 16 and 17.
Also shown in FIGS. 5 and 6 is the conductive strip 20. It is sewn
to the blank 10 on the side of the pattern that will form the sole
or bottom of the shoe, and it is shown extending from the toe
portion at 14 (or 15 in FIG. 6) by the dotted lines 21 all the way
to the heel section at 16/17 and extending beyond it, as shown in
the solid lines, the solid lines portion being designated by the
reference numeral 22. The extending strip 20 is shown in broken
form to illustrate that its length is indefinite and can be as long
as desired.
When the blank 10 is to be formed into a shoe covering, the
manufacturer simply folds the top portion of the blank, or the
toe-metatarsus section part, so that the angularly extending
section 12 matches and lies on top of the angularly extending
section 13. Stated differently, the blank 10 is folded on its
longitudinal axis or center line, designated by dotted line 32 in
FIG. 5, from point A to about point B. With the blank in this
partially folded condition, the manufacturer then sews, for
example, beginning at point 23 with point 23' in lapped position
with it, going along the edges of 13/12 to the overlapped center
section 14 and around the overlapped sections of 18 and 19 using an
elastic thread. This sewing causes an elastic seam 24 (FIG. 2) to
be formed running from the very front end of the shoe covering or
toe section 25 all the way up to the ankle ending at 26.
This is the only seam in the entire device. The manufacturer of the
shoe covering then continues the sewing going around the unlapped
edge of the reverse curve 18, the rounded bottom sections 16 and
17, then along the unlapped edges of reverse curve 19 going to the
sewn lapped sections of 18 and 19, and, if desired, back to the
place of beginning, the lapped 23/23' points. In stitching the
unlapped edges, puckering and gathering together of the material
occurs forming the side portions of the shoe and the heel portion
of the shoe designated as 27, 28 and 29, respectively, in FIG.
2.
As can be seen in FIG. 2 and in FIG. 3, both the angularly top
sections 12 and 13 being at a modest angle, the shoe covering can
be made to stop a bit short of the very front top of the shoe of
the wearer, leaving a section of the shoe 33 exposed. In some
instances this is desired as, for example, in tying and untying
one's shoe. However, in the majority of instances it is preferred
to cover the entire shoe. In order to effect that coverage the top
angular sections 12 and 13 are made to be more sharply angled to
the respective sides as shown by lines 30 and 31 in FIG. 6. When
said sharply angled sections are used, a manufacturer, upon
effecting the sewing of the elastic thread as described above,
creates a shoe covering which rises much higher on the anterior
portion of the foot and will cover completely the shoe of the
wearer as shown in FIG. 7 at section 34.
Also shown in FIGS. 1 and 7 is the conductive strip 20 which
extended beyond the bottom or heel section end of blank 10 in FIGS.
5 and 6. It is brought up along the outside of the heel section and
is tucked inside the shoe as shown in FIG. 2 to lie on the bottom
of the shoe, or it can be tucked into the sock of the wearer (not
shown for convenience). FIG. 4 shows the conductive strip 20 at the
heel portion of the covering of this invention. The conductive
strip lying on the bottom of the shoe, being section 21 shown in
FIGS. 5 and 6 can be seen in FIGS. 1, 3 and 7.
The conductive strip 20 can be made of any suitable material such
as cloth made of nylon, poly(ethylene terephthalate), rayon,
canvas, paper and similar fabric materials. These are filled with a
high percentage of carbon or graphite or similar pulverulent,
electrically conducting material. This material is kept contained
within the pores of the fabric by adhesives in any well-known
manner. The strip can be narrow or wide, and strips one-third the
width of the blank are frequently used.
The blank 10 can also be constructed of the fabric materials
mentioned above as well as muslin, any of the well-known
stretchable materials including a nylon stretch fabric known in the
trade as "Hellanca," non-woven papers and paper products such as
"Tyvek" available from the E. I. duPont deNemours and Co., Inc.,
poly(tetrafluoroethylene), or any of the many synthetic polymeric
materials. In general, all of the parts of the blank and shoe
covering of this invention are water-insensitive in normal use and
are substantially wear-resistant. Yet, as to the economic aspect
the materials used are relatively inexpensive, being available at
low cost. Thus, their disposal after only one use is more than
economically compatible with the results attained.
One of the distinct advantages of the shoe covering of this
invention is that the conductive strip 21 does not have to be and
indeed is not a part of any seam. It can be secured to the face of
blank 10 that becomes the bottom of the covering by gluing or by
sewing or by any such convenient means and in all instances it is
made to lie flat and entirely parallel with and in complete contact
with that outside section of the shoe covering. In practice one
simple stitching shown by dotted line 35 in FIG. 6 can effect the
mounting of the strip to the blank. This stitching follows
preferably the centerline or longitudinal axis of the blank and
runs the full length of blank 10.
Thus, irrespective of the size of the shoe that the user is
wearing, the conductive strip 21 will lie substantially in flat
contact over substantial portions of its length with the floor.
Further, since the conductive strip is not a part of any seam
forming the covering of this invention, the length of the
conductive strip is not limitative in any way. Therefore, it can
extend the full length of the shoe covering. This is a marked
advantage over the shoe coverings of the prior art in that many
operations are done with the operator being seated on a stool or
supporting his or her body in a position whereby only the covered
shoe toe portions or one of said toe portions of the person are or
is contacting the floor. Since the covers of the shoes of this
invention are equipped with the conductive strip and thereby are in
contact with the floor even in these positions, the desired
protection against static electricity accumulations is attained.
Still further, the shoe covering of this invention can be readily
and effectively worn by users having shoe sizes as small as size 4
for females and as large as a shoe of the size 14 as is encountered
occasionally among males in hospitals and similar institutions. The
formation of knots or bunched material under the foot of the wearer
is avoided, and the wearer walks in the normal comfort of his
shoes.
While the invention has been disclosed herein in connection with
certain embodiments and certain structural and procedural details,
it is clear that changes, modifications or equivalents can be used
by those skilled in the art; accordingly, such changes within the
principles of the invention are intended to be included within the
scope of the claims below.
* * * * *