Information
-
Patent Grant
-
6237249
-
Patent Number
6,237,249
-
Date Filed
Thursday, April 22, 199925 years ago
-
Date Issued
Tuesday, May 29, 200123 years ago
-
Inventors
-
Original Assignees
-
Examiners
- Sewell; Paul T.
- Mohandesi; Jila M.
Agents
- Lewis, D'Amato, Brisbois & Bisgaard, LLP
-
CPC
-
US Classifications
Field of Search
US
- 036 115
- 036 100
- 036 101
- 036 59 R
- 036 59 A
- 036 28
- 036 30 R
- 036 31
-
International Classifications
-
Abstract
A convertible slide and method for slide-type sandals typically used in the out-of-doors includes rubber and synthetic materials and exhibits a lightweight robust, high-strength, flexible construction including a midsole for supporting a foot. A vamp is securely attached to the midsole for covering the foot and includes a pair of outwardly extending studs for providing a pair of pivot points. A rear heel strap is provided for securing the convertible slide to the foot. The heel strap is rotatively connected to the pair of outwardly extending studs for rotating between a first lowered position about the heel of the foot and a second raised position above the vamp. Finally, an outsole is bonded to the midsole for contacting the ground surface. In a first alternative embodiment, the pair of outwardly extending studs is replaced by a pair of rivets while in a second alternative embodiment, the pair of outwardly extending studs is replaced by a pair of threaded screws.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to footwear. More specifically, the present invention relates to methods and apparatus for a slide-type sandal having a rear heel strap that is rotatable about pivot points to facilitate use of the sandal with or without the rear heel strap and without disassembling the sandal.
2. Description of the Prior Art
The prior art is directed to methods and apparatus for the construction of sandal type footwear. Sandals are one of the first types of footwear known to mankind and are mentioned in early recorded history. Early sandals included a flat component formed of a suitable material such as leather that served as a sole. The flat sole was placed under the foot to provide protection against the ground surface.
Various methods to attach the sandal to the foot are also known. An example includes the use of a suitable material such as leather to attach the sole of the sandal to the toes or ankle of the foot. In more recent times, a component of the sandal identified as a vamp and which covers the instep of the foot has been employed. The vamp is connected to the sole so that the sandal can be attached to the foot. The vamp may only partially cover the top of the foot so that the toes extend outward into the open air. In the alternative, the vamp may cover most of the top of the foot or even enclose the entire forward portion of the foot.
In the type of sandal that includes a vamp, the foot is positioned between the sole and the vamp. The sandal may be utilized in this manner without employing any additional means of attaching the sandal to the foot. This type of footwear is sometimes referred to as a “slide” because the foot enters the sandal by sliding since there is no structure to grab onto while donning the sandal. Further, this type of footwear has also been referred to as “flip-flops” because of the noise created by the tail end of the sole striking the heel of the user when walking. Under these conditions, the sandal is only loosely attached to the foot and is useful for more leisurely types of activities. More active types of activities requiring quicker movements could result in the sandal becoming inadvertently disconnected from the foot which might be undesirable.
Sandals that include a vamp can also employ additional means for attaching the sandal to the foot. For example, a suitable material such as leather can be used in strips to tie the sole and/or the vamp of the sandal to the foot. However, it has been known to employ a rear heel strap that is connected to the sandal. The rear heel strap can be connected to the vamp or other structural component of the sandal. The rear heel strap is used to wrap around the heel of the foot to ensure that the sandal remains attached to the foot.
Some sandals known in the prior art employ a rear heel strap that can be disconnected from the sandal. To achieve this disconnect feature, the sandal can incorporate buckles, hook and eye fasteners and other types of mechanical fasteners to connect and disconnect at least one end of the rear heel strap to and from the sandal. Typically, this type of sandal would only be used with the rear heel strap since only one end of the rear heel strap could be disconnected. If both ends of the rear heel strap could be disconnected, the sandal could be used as a “slide” or “flip-flop”. However, this would require the time and energy to physically remove the rear heel strap. Once removed, it would be necessary to store or carry the rear heel strap to prevent loss thereof. Since sandals are often used at the beach and at swimming pools, storage of the rear heel strap in order to avoid loss could be inconvenient. This is the case since beachwear normally worn at the seashore and around swimming pools often does not include pockets.
Thus, there is a need in the art for a sandal that includes a vamp attached to the sole and having an elastic rear heel strap that is rotatable about a pair of pivot points so that the rear heel strap can be pivoted between a lowered position about the heel of the foot and a rotated raised position over the arch of the foot and vice versa by employing simple foot manipulation to rotate the strap so that the sandal can be utilized with or without the elastic rear heel strap without disassembling the sandal.
SUMMARY OF THE INVENTION
Briefly, and in general terms, the present invention provides a new and improved convertible slide type sandal typically worn as footwear in the out-of-doors during the warm months of the year. However, the convertible slide can be used indoors as well as at the beach or the swimming pool. The novel and non-obvious convertible slide exhibits a cushioned midsole upon which a human foot rests. The midsole is attached to a durable outsole which contacts the ground surface. Bonded to the midsole and arching over the top of the foot is a vamp. The vamp covers only a portion of the human forefoot resulting in an open-toed footwear. Pivotably attached to the vamp is a rear heel strap used to assist in securing the convertible slide to the human foot. The components of the convertible slide are comprised of rubber and manmade synthetic cushioning materials. Further, the convertible slide exhibits a lightweight robust, high-strength, flexible construction and is economical to manufacture.
The rear heel strap of the inventive convertible slide is elastic or other flexible material to facilitate attaching the sandal to the foot. The elastic rear heel strap can be connected to the vamp by one of several different methods. In a preferred embodiment, the vamp includes a pair of outwardly extending studs comprised of, for example, polyvinylchloride (PVC) and molded directly to the side of the vamp. The pair of outwardly extending studs serve as pivot points for a pair of terminal ends of the rear heel strap. The terminal ends of the rear heel strap each include a penetration for passing over a corresponding one of the pair of outwardly extending studs. Each of the outwardly extending studs includes a mechanical stop for retaining the rear heel strap on each of the outwardly extending studs. The construction of the present invention enables the rear heel strap to be rotated between a first lowered position about the heel of the foot to a second raised position above the vamp without disassembling the sandal. The top rear surface of the vamp includes a contoured lip that retains the rear heel strap in the second raised position.
The present invention is generally directed to a convertible slide type sandal typically used in the out-of-doors and comprised of rubber and synthetic materials for exhibiting a lightweight robust, high-strength, flexible construction. In its most fundamental embodiment, the convertible slide comprises a construction having a midsole for supporting a foot. A vamp is securely attached to the midsole for covering the foot and includes a pair of outwardly extending studs for providing a pair of pivot points. A rear heel strap is provided for securing the convertible slide to the foot. The heel strap is rotatively connected to the pair of outwardly extending studs for rotating between a first lowered position about the heel of the foot and a second raised position above the vamp. Finally, an outsole is bonded to the midsole for contacting the ground surface. Also, the midsole can be comprised of ethylene vinyl acetate, the outsole can be comprised of rubber and both the vamp and the rear heel strap can be comprised of polyvinylchloride.
In a first alternative embodiment, the pair of outwardly extending studs are replaced by a pair of rivets that are used to attach the rear heel strap to the midsole and vamp. The pair of rivets are installed through appropriately placed penetrations formed in the midsole and vamp. A pair of nylon washers are utilized to separate the elastic rear heel strap from other components and to facilitate the rotation thereof. In a second alternative embodiment, the pair of outwardly extending studs and the pair of rivets are replaced by a pair of threaded screws. The pair of threaded screws are also installed through appropriately placed penetrations formed in the midsole and vamp. Each of the threaded screws cooperate with a correspondingly threaded T-nut that is installed in a recess on the inside surface of the midsole. In this second embodiment, the threaded screw and thus the rear heel strap is removable.
These and other objects and advantages of the present invention will become apparent from the following more detailed description, taken in conjunction with the accompanying drawings which illustrate the invention, by way of example.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
is a front perspective view of a convertible slide of the present invention showing a rear heel strap in a lowered position so as to be fitted about the back of the heel of a human foot.
FIG. 2
is another front perspective view of the convertible slide of
FIG. 1
showing the rear heel strap in a rotated raised position and resting forward of a contoured lip on the rear side of a vamp.
FIG. 3
is a left side elevational view of the convertible slide of
FIG. 1
showing the rear heel strap in the rotated raised position and resting forward of the contoured lip on the rear side of the vamp.
FIG. 4
is a right side elevational view of the convertible slide of
FIG. 1
showing the rear heel strap in the rotated raised position and resting forward of the contoured lip on the rear side of the vamp.
FIG. 5
is a top planar view of the convertible slide of
FIG. 1
with the vamp removed and showing a foot bed including a toe bar and an instep arch support upon which the human foot rests.
FIG. 6
is a bottom planar view of the convertible slide of
FIG. 1
showing the outsole secured to the bottom of the midsole.
FIG. 7
is a longitudinal cross-sectional view of the convertible slide of
FIG. 1
taken along line
7
—
7
of FIG.
6
and showing the outsole secured to the bottom of the midsole.
FIG. 8
is a first transverse cross-sectional view of the convertible slide of
FIG. 1
taken along line
8
—
8
of FIG.
6
and showing the outsole secured to the bottom of the midsole.
FIG. 9
is a second transverse cross-sectional view of the convertible slide of
FIG. 1
taken along line
9
—
9
of FIG.
6
and showing the instep arch support and the outsole secured to the bottom of the midsole.
FIG. 10
is a third transverse cross-sectional view of the convertible slide of
FIG. 1
taken along line
10
—
10
of FIG.
6
and showing the outsole secured to the bottom of the midsole.
FIG. 11
is a cross-sectional view of the convertible slide of
FIG. 1
taken along line
11
—
11
of
FIG. 2
showing the preferred embodiment of attaching the terminal ends of the rear heel strap to the vamp via an integral stud.
FIG. 12
is a cross-sectional view of a first alternative embodiment of the convertible slide of the present invention showing a second method of attaching the terminal ends of the rear heel strap to the vamp via a rivet.
FIG. 13
is a cross-sectional view of a second alternative embodiment of the convertible slide of the present invention showing a third method of attaching the terminal ends of the rear heel strap to the vamp via a screw.
FIG. 14
is an elevational view of the convertible slide of
FIG. 1
showing the front of the stud, rivet or screw of
FIGS. 11
,
12
or
13
, respectively, utilized to retain the terminal ends of the rear heel strap to the vamp.
FIG. 15
is the longitudinal cross-sectional view of
FIG. 7
showing a cushioned mesh fabric layer or other synthetic or leather layer mounted to the top of the midsole.
DESCRIPTION OF THE INVENTION
The present invention is a convertible slide
100
, i.e., a slide-type sandal, having an elastic and flexible rear heel strap
102
which is pivotably attached to a vamp
104
and where, in a preferred embodiment, the rear heel strap
102
is rotatable about a pair of outwardly extending studs
106
which serve as pivot points to facilitate use of the convertible slide
100
with or without the rear heel strap
102
, all without disassembling the sandal. In the lowered position, the rear heel strap
102
fits snugly behind the heel to secure the convertible slide
100
to the human foot. However, in the rotated raised position, the rear heel strap
102
is securely retained in the raised position by a contoured lip
108
molded to the top rear side of the vamp
104
. The bottom of the foot is supported by a cushioned midsole
110
positioned above and sealed to a rugged outsole
112
to provide a lightweight robust construction.
The preferred embodiment of the convertible slide
100
is best shown in
FIGS. 1-4
. The cushioned midsole
110
of the convertible slide
100
is a main component of the present invention since each of the other components are attached thereto. The midsole
110
as shown in
FIGS. 1 and 2
is a molded component and can be comprised of ethylene vinyl acetate known in the art as “EVA”. Portions on the bottom of the midsole
110
contact the floor or ground surface while the top of the midsole
110
supports a human foot. The midsole
110
includes a forward section that curls upward in the forefoot area and is known as a toe bumper
114
as shown best in
FIGS. 1 and 2
but also in
FIGS. 3-4
,
7
and
15
. Likewise, the midsole
110
includes a rearward section that curls upward in the heel area and is known as a heel bumper
116
also shown in
FIGS. 1-4
,
7
and
15
. Both the toe bumper
114
and the heel bumper
116
are an integral molded part of the midsole
110
. The full length of the midsole
110
is clearly shown in
FIGS. 7 and 15
.
The midsole
110
not only includes the forefoot toe bumper
114
and the rearward heel bumper
116
that wrap about the foot, it also includes a continuous side portion
118
about the convertible slide
100
as shown in
FIGS. 1-4
. The side portion
118
rises up along the side of the foot as part of the midsole
110
as is also clearly shown in
FIGS. 8-11
.
FIGS. 8-10
each illustrate cross-sectional views taken at different locations along the long dimension of the convertible slide
100
, i.e., across the forefoot, arch and heel sections of the sandal, respectively. As can be seen from
FIGS. 8-10
, the height and width of the side portion
118
varies along the length dimension of the convertible slide
100
. Thus, the dimension of the side portion
118
as shown in
FIGS. 1-4
can be seen to vary at different locations around the circumference of the sandal by referring to
FIGS. 8-10
.
In addition to the toe bumper
114
, the heel bumper
116
and the side portion
118
, the mold of the midsole
110
wraps underneath to form the bottom of the convertible slide
100
to support the bottom of the foot. Reference should be made to
FIGS. 6-10
which show the bottom portion of the molded midsole
110
that interfaces with the rugged outsole
112
of the convertible slide
100
. In particular,
FIGS. 7-10
clearly show the molded midsole
110
extending from the side portion
118
downward on both sides and integral with that portion of the midsole
110
that forms the bottom of the sandal. As is clearly shown, a plurality of recesses
120
are formed in the bottom of the midsole
110
for receiving pieces or sections of rubber or synthetic material which form the rugged outsole
112
. The rubber pieces that form the outsole
112
are shown located within the recesses
120
. Further, the sections of rubber that form the outsole
112
are positioned at the same level as the immediately adjacent portions of the midsole
110
as shown in
FIGS. 7-10
. Thus, the surface of the outsole
112
and consequently the bottom surface of the convertible slide
100
remains flat which is necessary in order to avoid unbalancing the sandal and interfering with the walking pattern of the person wearing the sandal.
The interface between the bottom portion of the midsole
110
and the outsole
112
is clearly shown in FIG.
6
. As can be seen, a pattern of oval shaped pieces or sections of rubber or other rugged synthetic material are affixed within the recesses
120
formed in the bottom of the outsole
110
. By forming the outsole
112
in separated discrete pieces as shown in
FIG. 6
, the overall weight of the convertible slide
100
is reduced resulting in a lighter weight sandal. Lightweight sandals are typically more desirable since they represent a reduced load that must be carried by the foot. Notwithstanding the reduced weight load, the construction of the convertible slide
100
of the present invention is rugged and robust.
The discrete pieces of rubber that form the outsole
112
are bonded to the underlying midsole
110
within the recesses
120
with a suitable adhesive known in the footwear manufacturing art. The individual pieces of rubber that form the outsole
112
include a plurality of suitable treads as shown in FIG.
6
. The treads of the individual pieces of rubber that form the outsole
112
are oriented so as to generate traction on the floor or ground surface when walking. It is clear from
FIGS. 7-10
that the outsole
112
makes contact with the floor or ground surface. However, it is equally clear that the midsole
110
which is positioned at the same level as the outsole
112
also makes contact with the floor or ground surface at selected points on the bottom of the convertible slide
100
.
The surface upon which the human foot rests within the convertible slide
100
is referred to as the “foot bed”. In the preferred embodiment of the present invention, the “foot bed” is the top surface
122
of the midsole
110
as shown in
FIGS. 1
,
2
, and
7
-
10
but is best shown in FIG.
5
. The midsole
110
is cushioned and typically is comprised of ethylene vinyl acetate (i.e., “EVA”). The top surface
122
of the midsole
110
can be contoured to fit the shape of the human foot to improve comfort as is shown in the planar view of FIG.
5
. The circumference of the midsole
110
shown in
FIG. 5
is intended to indicate the side portion
118
. Positioned in a transverse manner in the forefoot portion of the convertible slide
100
is a toe bar
124
. The toe bar
124
is molded to the top surface
122
of the midsole
110
and is utilized by the toes of the foot to grip the top surface
122
for stabilizing the convertible slide
100
, i.e., to improve the grip of the toes on the sandal. Also molded to the top surface
122
of the midsole
110
is an instep arch support
125
as is clearly shown in FIG.
5
. The instep arch support
125
is a subtle rise molded into the top surface
122
that supports the arch portion of the foot. In addition to the toe bar
124
and the instep arch support
125
, the foot is bounded by the toe bumper
114
and the heel bumper
116
when the foot rests on the top surface
122
of the midsole
110
.
If additional cushioning and air circulation is desired when wearing the convertible slide
100
, a fabric can be attached to the top surface
122
of the midsole
110
by a suitable adhesive well known in the art. The fabric can include a combination of materials ranging from synthetic-to-leather materials. In the preferred embodiment, a suitable fabric could include a foam material
126
adhered to a fabric backing incorporated within a mesh material
128
. This combination of materials employed to form the fabric is shown mounted upon the top surface
122
of the midsole
110
in FIG.
15
. The addition of the foam material
126
and the mesh material
128
is the only feature that distinguishes
FIG. 15
from FIG.
7
. The surface upon which the human foot rests in
FIG. 15
, i.e., the “foot bed”, is now the fabric comprised of the foam material
126
and the mesh material
128
. The foam material
126
improves the cushioning previously provided by the midsole
110
. Additionally, the mesh material
128
functions to improve the circulation of air underneath the foot to reduce perspiration and related problems. It is noted that these fabric materials are only exemplary and alternative materials suitable for use in improving cushioning and ventilation can also be utilized.
The vamp
104
is clearly shown arching over and attached to the midsole
110
in
FIGS. 1-4
. The vamp
104
is defined as that part of the convertible de
100
that covers the instep of the foot where the instep is the arched portion of the foot that rests upon the instep arch support
125
shown in FIG.
5
. The vamp
104
is preferably comprised of polyvinylchloride (PVC) but can also be formed from rubber, silicon or a PVC-rubber combination. The vamp
104
is clearly shown in FIG.
1
and is bonded to the midsole
110
. Reference to
FIGS. 8-10
clearly show the side portions
118
of the midsole
110
. The side portions
118
extend upward around the forefoot, the arch and the heel portion of the midsole
110
as shown consecutively in
FIGS. 8
,
9
and
10
, respectively. It is noted that the side portions
118
are diminished in size along the long dimension of the convertible slide
100
from front to rear in
FIGS. 8
,
9
and
10
, respectively. Further,
FIGS. 7 and 15
show the long dimension of the upward extending side portions
118
.
It is the side portions
118
extending upward from the midsole
110
that are employed to bond the vamp
104
to the midsole
110
as can be seen in
FIGS. 1-4
. Reference to
FIG. 11
shows the upward extending side portion
118
interfacing with the vamp
104
in the preferred embodiment of the convertible slide
100
. The bonding of the side portions
118
to the vamp
104
is accomplished by the use of a suitable adhesive well known in the footwear manufacturing arts. The vamp
104
extends from the forefoot area back to just behind the arch area as can be seen in
FIGS. 1-4
. Because the vamp
104
terminates in the forefoot area, the forward portion of the convertible slide
100
is open-air. Notwithstanding the open-air design, the top of the vamp
104
can include a plurality of openings
130
which increase the ventilation flow. Further, the plurality of openings
130
can be shaped to enhance the ornamental and cosmetic features of the sandal. The top rear portion of the vamp
104
also includes a smooth contoured surface
132
which is somewhat concave and extends the entire width of the vamp
104
as shown in FIG.
1
. Additionally, the contoured lip
108
is molded onto the rear boundary of the contoured surface
132
. The contoured surface
132
and the contoured lip
108
will be discussed in more detail in conjunction with the elastic rear heel strap
102
hereinbelow.
Extending outward from and molded to the vamp
104
on each side of the convertible slide
100
is the pair of peg-like studs
106
. Each of the studs
106
is preferably comprised of polyvinylchloride (PVC) since they are molded to the vamp
104
and must be compatible therewith. However, the studs
106
can also be fabricated from other materials consistent with the material of the vamp
104
such as rubber, silicon or a PVC-rubber combination. One of the pair of studs
106
is clearly illustrated in FIG.
11
and is shown extending outward in an orthogonal manner from the vamp
104
. The length of each of the studs
106
is slightly longer than the width of the elastic rear heel strap
102
. Additionally, the circumference of each of the outwardly extending studs
106
is slightly smaller than the diameter of a penetration
134
formed in each of a pair of terminal ends
136
associated with the rear heel strap
102
. In the preferred embodiment, each of the studs
106
is passed through the corresponding penetration
134
of one of the terminal ends
136
for rotatively attaching the rear heel strap
102
to the vamp
104
.
Each of the peg-like studs
106
that extend outward from the side of the vamp
104
also includes a stop
138
as is clearly shown in FIG.
11
. The stop
138
can assume the shape of a button or a mushroom as is clearly shown in
FIGS. 1-4
. The exterior face of the stop
138
is shaped to resemble the head of a screw having a pair of cross-grooves for accommodating a screwdriver. However, it should be understood that the vamp
104
, the pair of studs
106
and the stop
138
are integrally formed of PVC and do not rotate. Thus, the screw head shape of the exterior face of the stop
138
is only cosmetic in nature.
The function of each of the stops
138
is to prevent the terminal ends
136
of the elastic rear heel strap
102
from sliding off of the corresponding outwardly extending stud
106
. Thus, each of the stops
138
prevents the rear heel strap
102
from escaping the confines of the corresponding outwardly extending stud
106
whether the heel strap
102
is wrapped about the heel of the foot or is being rotated about the stud
106
. Thus, the penetration
134
in the terminal ends
136
of the rear heel strap
102
must be large enough and the length of the outwardly extending studs
106
must be long enough so that the rear heel strap
102
can be freely rotated about the studs
106
. The rear heel strap
102
is typically comprised of polyvinylchloride (PVC) and exhibits an elastic characteristic. In the alternative, the rear heel strap
102
can also be comprised of a flexible or stretchable material such as, for example, silicon.
When it is desired to wear the convertible slide
100
on the foot, it is first necessary to decide if the footwear is to be employed as a conventional sandal or as a slide (i.e., as a strapless loose fitting sandal). If the convertible slide
100
is to be used as a slide-type sandal (such as when walking on the beach), then the rear heel strap
102
is rotated about the outwardly extending studs
106
until the heel strap
102
is positioned over the smooth contoured surface
132
. This position is referred to as the raised position above the vamp
104
. The smooth contoured surface
132
shown in
FIG. 1
is shaped to receive the rear heel strap
102
as shown in
FIGS. 2-4
. It is the contoured lip
108
molded on the top rear side of the vamp
104
that serves to hold the rear heel strap
102
on the smooth contoured surface
132
(i.e., in the raised position). Once the rear heel strap
102
is positioned on the smooth contoured surface
132
, the foot can slide in between the top surface
122
of the midsole
110
and the vamp
104
. The forefoot is then positioned so that the toes of the foot can grasp the toe bar
124
and the arch of the foot is placed over the instep arch support
125
. The convertible slide
100
can then be worn as a strapless loose fitting slide-type sandal.
If the convertible slide
100
is to be employed as a conventional sandal then the rear heel strap
102
is moved off of the smooth contoured surface
132
and past the contoured lip
108
. The rear heel strap
102
is then rotated from the raised position above the vamp
104
shown in
FIG. 2
to a lowered position about the heel of the foot shown in FIG.
1
. The foot can then slide in between the top surface
122
of the midsole
110
and the vamp
104
. The forefoot is then positioned so that the toes of the foot can grasp the toe bar
124
and the arch of the foot can be placed over the instep arch support
125
as before. Finally, the rear heel strap
102
is securely positioned behind the heel of the foot. The convertible slide
100
can then be worn as a conventional sandal with the rear heel strap
102
positioned about the heel of the foot to provide additional stability as when walking on hard surfaces.
Thus, the elastic rear heel strap
102
, which is rotatively connected to the pair of outwardly extending studs
106
as shown in
FIG. 11
, is rotatable between a first lowered position about the heel of the foot and a second raised position above the vamp
104
which enables the sandal to be used with or without the elastic heel strap
102
, respectively. This feature provides the convertible character of the slide-type sandal of the present invention.
A first alternative embodiment of the convertible slide of the present invention is shown in FIG.
12
and is referred to by the identification number
200
. Each of the components appearing in the alternative embodiment
200
that correspond in structure and function to those components appearing in the preferred embodiment
100
is identified by the corresponding number of the
200
series.
The structural modifications appearing in the first alternative embodiment
200
of the present invention are directed to the method of attaching an elastic rear heel strap
202
to a vamp
204
and a cushioned midsole
210
of the convertible slide
200
as shown in FIG.
12
. Each slide-type sandal of the convertible slide
200
includes two attachment points between the vamp
204
and the elastic rear heel strap
202
. Thus, the two attachment points require that each side of the slide-type sandal includes the structure shown in FIG.
12
. Thus,
FIG. 12
shows the structure of only one of the two sides of the sandal. One of a pair of side portions
218
which extends upward from a top surface
222
of the midsole
210
is shown attached to the vamp
204
. The attachment between the vamp
204
and the side portion
218
of the midsole
210
is achieved in exactly the same manner as previously described with reference to the convertible slide
100
of the preferred embodiment. The attachment is achieved through bonding by the use of a suitable adhesive well known in the art of footwear manufacturing.
The following description is directed to the method of rotatively connecting each of a pair of terminal ends
236
of the rear heel strap
202
to the vamp
204
and the midsole
210
. One of a pair of penetrations
242
is shown formed through the bonded combination of the vamp
204
and side portion
218
of the midsole
210
in FIG.
12
. Also, one of a pair of penetrations
234
is shown formed through one of the pair of terminal ends
236
in FIG.
12
. It is noted that the penetration
234
formed in the terminal end
236
shown in
FIG. 12
is horizontally aligned with the penetration
242
formed through the vamp
204
and the upward extending side portion
218
of the midsole
210
. A rivet
244
is inserted through the penetration
234
formed in the terminal end
236
of the rear heel strap
202
and the penetration
242
formed through the vamp
204
and the side portion
218
of the midsole
210
. The rivet
244
thus functions to bind the rear heel strap
202
, the vamp
204
and the side portion
218
of the midsole
210
together. Additionally, the rivet
244
serves as a pivot point for the rear heel strap
202
to rotate between a first lowered position and a second raised position.
The rivet
244
can be comprised of, for example, plastic, metal, nylon or other suitable material while the elastic rear heel strap
202
and the vamp
204
are each comprised of polyvinylchloride. As with the preferred embodiment
100
, the rear heel strap
202
can be comprised of another suitable flexible material such as, for example, silicon. Thus, during rotation of the rear heel strap
202
about the rivet
244
, it is common for the friction between the heel strap
202
, the vamp
204
and the rivet
244
to interfere with smooth rotation. In order to facilitate smoother rotation of the rear heel strap
202
about the rivet
244
, one of a first pair of nylon washer separators
246
is placed on the inside of the rear heel strap
202
and one of a second pair of nylon washer separators
248
is placed on the outside of the rear heel strap
202
as shown in FIG.
12
. Thus, the rear heel strap
202
can more freely rotate about the rivet
244
between the first lowered position and the second raised position. The remainder of the operation of the convertible slide
200
is duplicate to that as described for the convertible slide
100
of the preferred embodiment.
A second alternative embodiment of the convertible slide of the present invention is shown in FIG.
13
and is referred to by the identification number
300
. Each of the components appearing in the alternative embodiment
300
that correspond in structure and function to those components appearing in the preferred embodiment
100
is identified by the corresponding number of the
300
series.
The structural modifications appearing in the second alternative embodiment
300
of the present invention are directed to the method of attaching an elastic rear heel strap
302
to a vamp
304
and a cushioned midsole
310
of the convertible slide
300
as shown in FIG.
13
. It is noted that the rear heel strap
302
can also be comprised of other suitable flexible materials such as, for example, silicon. Each slide-type sandal of the convertible slide
300
also includes two attachment points between the vamp
304
and the elastic rear heel strap
302
. Thus, the two attachment points require that each side of the slide-type sandal includes the structure shown in FIG.
13
. Thus,
FIG. 13
shows the structure of only one of the two sides of the sandal. One of a pair of side portions
318
which extends upward from a top surface
322
of the midsole
310
is shown attached to the vamp
304
. The attachment between the vamp
304
and the side portion
318
of the midsole
310
is achieved in exactly the same manner as previously described with reference to the convertible slide
100
of the preferred embodiment. The attachment is achieved through bonding by the use of a suitable adhesive well known in the art of footwear manufacturing.
The following description is directed to the method of rotatively connecting each of a pair of terminal ends
336
of the rear heel strap
302
to the vamp
304
and the midsole
310
.
One of a pair of penetrations
360
is shown formed through the bonded combination of the vamp
304
and side portion
318
of the midsole
310
in FIG.
13
. Also, one of a pair of penetrations
334
is shown formed through one of the pair of terminal ends
336
in FIG.
13
. It is noted that the penetration
334
formed in the terminal end
336
shown in
FIG. 13
is horizontally aligned with the penetration
360
formed through the vamp
304
and the upward extending side portion
318
of the midsole
310
. It is noted that more than one pair of penetrations
334
can be formed through the pair of terminal ends
336
for the purpose of adjusting the tension in the rear heel strap
302
.
One of a pair of threaded screws
362
is inserted through the penetration
334
formed in the terminal end
336
of the rear heel strap
302
and through the penetration
360
formed through the vamp
304
and the side portion
318
of the midsole
310
. Aligned with the threaded screw
362
and also passing through the penetration
360
and the penetration
334
is a threaded receiver known as a T-nut
364
. The T-nut
364
includes internal threads that cooperate with the threads of the screw
362
as shown in FIG.
13
. The T-nut
364
includes a flat bottom
366
that fits into a recess
368
formed in the interior wall of side portion
318
to avoid rubbing against the foot placed adjacent the side portion
318
of the midsole
310
. The threaded screw
362
thus functions to bind together the rear heel strap
302
, the vamp
304
and the side portion
318
of the midsole
310
. Additionally, the threaded screw
362
serves as a pivot point for the rear heel strap
302
to facilitate rotation between a first lowered position and a second raised position.
The face of the threaded screw
362
includes a pair of cross-grooves
370
as shown in FIG.
14
. The cross-grooves
370
can be manipulated by a screwdriver to remove or insert the threaded screw
362
. The threaded screw
362
is removable so that the elastic rear heel strap
302
can be disassembled and removed from the convertible slide
300
. Removing the rear heel strap
302
enables the amount of tension therein to be adjusted by changing the penetration
334
in the rear heel strap
302
that the threaded screw
362
is reinserted into.
The threaded screw
362
can be comprised of, for example, plastic, metal, nylon or other suitable material while the elastic rear heel strap
302
and the vamp
304
are each typically comprised of polyvinylchloride. If friction between the heel strap
302
, the vamp
304
and the threaded screw
362
interferes with the smooth rotation of the rear heel strap
302
about the threaded screw
362
, the method illustrated and described in the convertible slide
200
of the first alternative embodiment can also be employed in the convertible slide
300
. Thus, the rear heel strap
302
could more freely rotate about the threaded screw
362
between the first lowered position and the second raised position. The remainder of the operation of the convertible slide
300
is duplicate to that as described for the convertible slide
100
of the preferred embodiment.
The present invention provides novel advantages over other conventional sandal and slide-type sandal footwear known in the art. A main advantage of the convertible slide
100
of the present invention is that the elastic rear heel strap
102
is rotatable about the pair of studs
106
between a first lowered position about the heel of the foot to a second raised position above the vamp
104
. This feature enables the sandal to be used with or without the elastic rear heel strap
102
, respectively, and thus provides the convertible character of the slide-type sandal. Furthermore, the convertible slide
100
of the present invention is simple to operate since the rear heel strap
102
can be moved between the first lowered position and the second raised position by, for example, simple foot manipulation. Additionally, the convertible slide
100
exhibits a lightweight robust construction that is economical to produce.
While the present invention is described herein with reference to illustrative embodiments for particular applications, it should be understood that the invention is not limited thereto. Those having ordinary skill in the art and access to the teachings provided herein will recognize additional modifications, applications and embodiments within the scope thereof and additional fields in which the present invention would be of significant utility.
It is therefore intended by the appended claims to cover any and all such modifications, applications and embodiments within the scope of the present invention. accordingly,
Claims
- 1. A convertible slide comprising:a midsole for supporting a foot; a vamp securely attached to said midsole for covering said foot, said vamp including a pair of outwardly extending studs for providing a pair of pivot points; a rear heel strap for securing said convertible slide to said foot, said heel strap being connected to said pair of studs for rotating between a first lowered position about the heel of said foot and a second raised position above said vamp; and an outsole bonded to said midsole for contacting a ground surface, said outsole comprising a plurality of discrete pieces of rugged material bonded within a corresponding plurality of recesses formed in the bottom of said midsole, said bottom of said midsole and said outsole being at the same level.
- 2. The convertible slide of claim 1 wherein said midsole is comprised of ethylene vinyl acetate.
- 3. The convertible slide of claim 1 wherein said midsole further includes a toe bar.
- 4. The convertible slide of claim 1 wherein said midsole further includes an instep arch support.
- 5. The convertible slide of claim 1 wherein said vamp is comprised of polyvinylchloride.
- 6. The convertible slide of claim 1 wherein said vamp includes a smooth contoured surface for supporting said rear heel strap in said second raised position.
- 7. The convertible slide of claim 1 wherein said vamp further includes a contoured lip for retaining said rear heel strap in said second raised position.
- 8. The convertible slide of claim 1 wherein said vamp includes a plurality of ventilation holes.
- 9. The convertible slide of claim 1 wherein said rear heel strap is comprised of elastic polyvinylchloride.
- 10. The convertible slide of claim 1 wherein said rear heel strap is comprised of silicon.
- 11. The convertible slide of claim 1 wherein said rear heel strap includes a pair of terminal ends wherein each of said terminal ends includes a penetration and wherein each of said pair of outwardly extending studs passes through a corresponding one of said penetrations.
- 12. The convertible slide of claim 1 wherein each of said outwardly extending studs includes a mechanical stop for retaining said rear heel strap on each of said outwardly extending studs.
- 13. The convertible slide of claim 1 wherein said outsole is comprised of rubber.
- 14. The convertible slide of claim 1 further including a cushioned fabric mesh layer bonded to a top surface of said midsole for providing improved comfort and ventilation to said foot.
- 15. A convertible slide comprising:a midsole for supporting a foot; a vamp securely attached to said midsole for covering said foot; a pair of fasteners, each of said fasteners passing through one of a corresponding pair of penetrations formed through said vamp and said midsole; a rear heel strap for securing said convertible slide to said foot, said heel strap being connected to said pair of fasteners for rotating between a first lowered position about the heel of said foot and a second raised position above said vamp; and an outsole bonded to said midsole for contacting a ground surface, said outsole comprising a plurality of discrete pieces of rugged material bonded within a corresponding plurality of recesses formed in the bottom of said midsole, said bottom of said midsole and said outsole being at the same level.
- 16. The convertible slide of claim 15 wherein said pair of fasteners comprises a pair of rivets.
- 17. The convertible slide of claim 16 wherein each of said pair of rivets further includes at least one washer separator for facilitating the rotation of said rear heel strap.
- 18. The convertible slide of claim 15 wherein said pair of fasteners includes a pair of threaded screws.
- 19. The convertible slide of claim 18 wherein each of said pair of threaded screws further includes a T-nut for locking said threaded screws in place.
- 20. The convertible slide of claim 19 wherein each of said T-nuts is positioned within a recess formed within a side portion of said midsole.
- 21. The convertible slide of claim 15 further including a cushioned fabric mesh layer bonded to a top surface of said midsole for providing improved comfort and ventilation to said foot.
- 22. A convertible slide comprising:a midsole for supporting a foot; a vamp securely attached to said midsole for covering said foot, said vamp including a pair of outwardly extending studs for providing a pair of pivot points; a rear heel strap for securing said convertible slide to said foot, said heel strap being connected to said pair of studs for rotating between a first lowered position about the heel of said foot and a second raised position above said vamp; a contoured lip formed on said vamp for retaining said rear heel strap in said second raised position; and an outsole bonded to said midsole for contacting a ground surface, said outsole comprising a plurality of discrete pieces of rugged material bonded within a corresponding plurality of recesses formed in the bottom of said midsole, said bottom of said midsole and said outsole being at the same level.
US Referenced Citations (8)
Foreign Referenced Citations (2)
Number |
Date |
Country |
1183183 |
Jul 1959 |
FR |
359913 |
Apr 1930 |
GB |