Convertible slide and method

Information

  • Patent Grant
  • 6237249
  • Patent Number
    6,237,249
  • Date Filed
    Thursday, April 22, 1999
    25 years ago
  • Date Issued
    Tuesday, May 29, 2001
    23 years ago
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)
Number Name Date Kind
D. 102345 Stein Dec 1936
3336683 Schellkopf Aug 1967
4124946 Tomlin Nov 1978
4897936 Fuerst Feb 1990
4899467 Mackey Feb 1990
5651195 Clancy Jul 1997
5687492 Muraoka Nov 1997
5901467 Peterson et al. May 1999
Foreign Referenced Citations (2)
Number Date Country
1183183 Jul 1959 FR
359913 Apr 1930 GB