Abstract:
Embodiments of this invention include a shoe having removable or interchangeable heels. Some embodiments have a low heel and a high heel, each having mechanisms for attaching and detaching said heel(s) from said shoe. Further embodiments include a shoe body having an expandable element, permitting the shoe body to attain a shape suitable for low heel configuration, and permitting the shoe body to change shape to accommodate a high heel configuration. Embodiments of this invention thereby permit a person to wear a single pair of shoes, carry one or more pairs of heels, and change the heels to either low heel or high heel shoes. Such embodiments eliminate the need for a person to carry a multiplicity of pairs of shoes.

Description:
[0001]    This application claims priority to Provisional U.S. Patent Application Ser. No. 61/652,193, filed May 26, 2012. 
     
    
     FIELD OF THE INVENTION 
       [0002]    The present invention relates to women&#39;s shoes, more particularly women&#39;s shoes with a mechanism that enables the shoe to be transformed from a shoe having a first heel into a shoe having a second heel. In particular, the present invention provides a shoe that transforms a shoe having a first heel into a shoe having a second heel by removing the first heel and replacing the first heel with the second heel. The shoe transforms from a shoe having a second heel back into a shoe having a first heel by removing the second heel and replacing the second heel with the first heel. Also provided is a shoe that transforms a shoe having a first heel into a shoe having a second heel by retracting the first heel and attaching the second heel over the retracted first heel. The shoe transforms from a shoe having a second heel back into a shoe having a first heel by removing the second heel and de-retracting the first heel. 
       BACKGROUND 
       [0003]    Women who enjoy fashion but recognize the harmful long-term effects and daily discomfort of walking and working for hours in high-heeled shoes face the same tough decision every day: To wear a low-heeled shoe, thereby sacrificing style and fashion for assured comfort, or to wear a high-heeled shoe, thereby sacrificing short-term comfort and possibly long-term foot health for a stylish appearance. Numerous medical complications, ranging from bunions, corns and callouses, to ingrown toenails, knee damage and lower back pain have been conclusively linked to extended use of high-heels, and the effects can last a lifetime. 
         [0004]    One widely-recognized solution to this conundrum is the practice of women wearing low-heeled shoes, flat shoes, or flip-flops when they leave their homes, and carrying with them additional bags on a daily basis containing higher-heeled shoes, giving them the option of switching between low and high heels during the day. 
         [0005]    Others have attempted alternate solutions, whereby a single shoe may utilize interchangeable heels of different heights. 
         [0006]    For example, U.S. Pat. No. 3,581,413 discloses a detachable heel for shoes such as ladies&#39; or men&#39;s shoes that includes a means for permitting the manual locking or unlocking of the heel with respect to the shoes, so that heels can be placed or changed whenever desired or required. 
         [0007]    In another example, U.S. Pat. No. 4,610,100 discloses a shoe [having] a permanently affixed heel plate attached to the bottom of the heel support portion of the shoe. This heel plate contains a mortise having a decreasing transverse width from the front to the rear of the heel plate. A replaceable heel having a flat surface on one side and a dovetail on the reverse surface corresponding in shape to the opening in the mortise is slid into the mortise to be firmly seat[ed] by a friction fit on the heel plate. 
         [0008]    In another example, U.S. Pat. No. 4,805,320 discloses a women&#39;s shoe with flexible shank for use with replaceable heels of different height [that] includes a sole with a forward support portion and a raised heel portion and an overlying insole. An elongated flexible spring steel shank is nested within a slot between the insole and sole and at one end anchored thereto. A high heel registers with the heel portion and interlocking fasteners upon the heel and heel portion upon limited rotation of the heel relative to the shoe removably anchors the heel upon the shoe. The heel upon limited angular rotation and disengagement of the fasteners is adapted for removal and replacement by a low heel having similar fasteners. The shank moves within the slot to compensate for the change in height. The interlocking fasteners include opposed interconnected lock segments and anchor flanges secured respectively to the heel and heel portion. An alignment pin in the heel projects into an alignment opening in the sole preventing relative rotation of the heel and heel portion to prevent disengagement of the segments and flanges. 
         [0009]    In another example, U.S. Pat. No. 4,670,996 discloses an article of footware comprising a shoe having a removable and replaceable heel. Attached to the sole surface of the shoe&#39;s upper is a [sic] outwardly projecting shaft which is adapted to fit into an internal bore formed in the core of the shoe&#39;s heel member. A latch mechanism is provided for inhibiting unintended separation of the heel from the upper. 
         [0010]    In another example, U.S. Pat. No. 5,058,290 discloses a high heel shoe with a self seating removable heel portion includes a shoe body having a sole portion with a toe and a heel area, the heel area being elevated substantially above the toe area so that the shoe sole is inclined between the toe and the heel and at the heel area. The heel portion of the shoe sole has a socket with a forwardly facing open end and a closed rear end, the socket having a side wall forming a continuous dove-tail joint portion. The high heel has an enlarged upper end portion with an inclined upper surface and a dove-tail locking member extends upwardly from the high heel upper end portion inclined surface, the locking member including a pedestal with a dove-tail side wall that corresponds to and registers with the socket so that the heel can be attached to the socket by moving the heel pedestal into the socket into a fore to aft direction, and wherein the heel is constantly loaded rearwardly during use insuring a seating of the heel upon the socket during use. 
         [0011]    In another example, U.S. Pat. No. 5,079,857 discloses a shoe having a detachable heel. The shoe includes a foot receptacle portion having a threaded stem extending downwardly from the foot receptacle portion and a locking pin slot, and a shoe heel threadedly engageable to the stem and having a locking pin assembly which engages the locking pin slot to secure the heel in a fixed position. 
         [0012]    In another example, U.S. Pat. No. 6,631,570 discloses a structure of a low to high heel shoe wherein a sole . . . having two semicircular “D” shaped punched holes on either side of the shank is formed in the rear of the shoe sole area, to receive a bolt fitting . . . having a bight slot and two opposing distal members, fitting through the punched holes and over the shoe shank thereby adjoining to the heel. 
         [0013]    In another example, U.S. Patent Application 20010052195 A1 discloses a convertible shoe ensemble with a heel that is manually attachable to and removable from the shoe, and a manually attachable and removable heel cover of substantially less height than the heel for attachment to the shoe when the heel is detached. 
         [0014]    The examples above, however, do not address the problems encountered when heel height is altered, such as, for example, the change in shape of the sole of the shoe, the change in shape of the upper of the shoe, or the apparent change in size of the shoe caused by changes in the shape of the wearer&#39;s foot. If not properly addressed, these changes can affect wearer comfort. 
         [0015]    Attempts have been made to address the change in shape of the sole of the shoe when a heel is replaced by another of a different height. For example, U.S. Pat. No. 5,309,651 discloses [t]ransformable shoe frames . . . wherein the heel of the shoe can be extended downwardly in a high heel position or converted to a low heel position. The shoe frame is made in sections that are pivotally connected to each other and mechanisms have been provided to lock the sections together in varying positions, so that the angle between the toe portion and the remainder of the shoe can be adjusted to maximize the comfort of the wearer depending on whether the heel is in a high heel or a low heel position. Additional mechanisms are illustrated to change the contour of the arch when the heel height is changed. In a preferred embodiment the heel is stowable under the sole of the shoe and the sole will have a well defined flexible region in the distal metatarsal region of the shoe, either by having a hinged joint or built in flexibility. 
         [0016]    In another example, U.S. Patent Application 20100146817 A1 discloses an article of footwear [that] has a height adjustable heel. A heel assembly is coupled to a toe assembly. A sole assembly is disposed over the heel assembly. A hinge assembly joins the sole assembly and heel assembly at a junction with the toe assembly. The hinge assembly has a locking mechanism, which allows the sole assembly to pivot with respect to the heel assembly to adjust a height of the sole assembly over the heel assembly when the locking mechanism is disengaged. The height of the sole assembly over the heel assembly is fixed when the locking mechanism is engaged. The heel assembly has a first inner support and the sole assembly has a second inner support. A pin coupled to a sprocket engages and disengages the first inner support and the second inner support to adjust a height of the sole assembly with respect to the heel assembly. 
         [0017]    In another example, U.S. Patent Application 20100139123 A1 discloses a transformable shoe [that] can transform into different heel heights. It is a shoe wherein the heel is detached or attached that transforms the shoe into heels of varying heights. The frame of the shoe contains two independent soles that are pivotally connected via a hinge. The two independent shoe soles will vary angles via the hinge upon attaching or detaching of the heel. Heels of varying heights can be attached to the bottom of the sole. The hinge connecting the two independent soles will rotate according to the height of the heels attached to the sole. The heel upon detachment from the shoe can be stowed by the person separately. 
         [0018]    Attempts have been made to address the change in shape of the upper of the shoe when a heel is replaced by another of a different height. For example, U.S. Pat. No. 7,059,068 discloses a height adjustable flexible shoe including a shoe upper portion having an open upper end, a closed lower end, and a body portion therebetween. The open upper end is dimensioned for receiving a foot therein. The closed lower end has a toe portion and a back portion. The back portion has a first heel portion extending downwardly therefrom. The body portion is comprised of an adjustable elastomeric material. A second heel portion is adapted for removably coupling with the first heel portion of the shoe upper portion. A third heel portion is adapted for removably coupling with the second heel portion. The first, second, and third heel portions are of substantially equal heights to provide significant control over the inclination of the shoe. 
         [0019]    None of the examples above address all the problems that manifest in the need to provide a shoe with interchangeable heels of different heights. There remains, therefore, a need to provide a shoe with interchangeable heels of different heights, and that addresses all the problems encountered when heel height is altered, namely, the change in shape of the sole of the shoe, the change in shape of the upper of the shoe, or the apparent change in size of the shoe caused by changes in the shape of the wearer&#39;s foot. 
       SUMMARY 
       [0020]    In one embodiment, the present invention provides a shoe that can be transformed from a shoe having a first heel into a shoe having a second heel. In one embodiment, the first heel and second heel have different heights. In one embodiment, the first heel is a low-heel and the second heel is a high-heel. 
         [0021]    In one embodiment, the wearer transforms a shoe having a first heel into a shoe having a second heel by removing the first heel and replacing the first heel with the second heel. In one embodiment, the wearer transforms a shoe having a second heel back into a shoe having a first heel by removing the second heel and replacing the second heel with the first heel. 
         [0022]    In one embodiment, the wearer transforms a shoe having a first heel into a shoe having a second heel by retracting the first heel and attaching the second heel over the retracted first heel. In one embodiment, the wearer transforms a shoe having a second heel back into a shoe having a first heel by removing the second heel and de-retracting the first heel. 
         [0023]    In one embodiment, the shoe has an upper that is able to change shape when the shoe is transformed, in order to maintain or facilitate wearer comfort. 
         [0024]    In one embodiment, the shoe has a liner that is able to conform to the changes in the wearer&#39;s foot that occur when the shoe is transformed, in order to maintain or facilitate wearer comfort. In one embodiment, the liner is able to conform to the changes in the shoe that occur when the shoe is transformed, in order to maintain or facilitate wearer comfort. 
         [0025]    In one embodiment, the shoe has a foot bed that is able to conform to the changes in the wearer&#39;s foot that occur when the shoe is transformed, in order to maintain or facilitate wearer comfort. In one embodiment, the foot bed is able to conform to the changes in the shoe that occur when the shoe is transformed, in order to maintain or facilitate wearer comfort. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0026]    The accompanying drawings, which are incorporated herein and form part of the specification, illustrate various embodiments of the present invention and, together with the description, further serve to explain the principles of the invention and to enable a person of ordinary skill in the art to make and use the invention. In the drawings, like reference numbers indicate identical or functionally similar elements. A more complete appreciation of the invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein: 
           [0027]      FIG. 1  shows one embodiment of the present invention whereby the wearer transforms a shoe having a first heel into a shoe having a second heel by removing the first heel and replacing the first heel with the second heel. 
           [0028]      FIG. 2  shows an alternate embodiment of the present invention whereby the wearer transforms a shoe having a first heel into a shoe having a second heel by retracting the first heel and attaching the second heel over the retracted first heel. 
           [0029]      FIG. 3  shows an alternate embodiment of the present invention whereby the wearer transforms a shoe having a first heel into a shoe having a second heel by removing the first heel and replacing the first heel with the second heel. 
           [0030]      FIG. 4  shows an alternate embodiment of the present invention whereby the wearer transforms a shoe having a first heel into a shoe having a second heel by removing the first heel and replacing the first heel with the second heel. 
           [0031]      FIG. 5  an alternate embodiment of the present invention whereby the wearer transforms a shoe having a first heel into a shoe having a second heel by removing the first heel and replacing the first heel with the second heel. 
       
    
    
     DETAILED DESCRIPTION 
       [0032]    For clarity of disclosure, and not by way of limitation, the detailed description of the invention is divided into the following subsections that describe or illustrate certain features, embodiments or applications of the present invention. 
       The Shoe of the Present Invention 
       [0033]    In one embodiment, the present invention provides a shoe that can be transformed from a shoe having a first heel into a shoe having a second heel. In particular, the present invention enables a person to easily exchange one heel type with another heel type on a single shoe. Most often, such heel types include a “low heel” type and a “high heel” type. A low heel type can be desirable if the person is engaged in walking under conditions in which a high heel is not desired. Such situations include walking on a sidewalk to or from a destination. Because extended walking in high heels can lead to deleterious foot conditions, it can be desirable to be able to switch between low and high heel configurations. 
         [0034]    In one embodiment, the shoe has interchangeable heels, allowing the wearer to transform the shoe having a first heel into a shoe having a second heel by removing the first heel and replacing the first heel with the second heel. In one embodiment, the wearer transforms a shoe having a second heel back into a shoe having a first heel by removing the second heel and replacing the second heel with the first heel. 
         [0035]    In one embodiment, the shoe has interchangeable heels, allowing the wearer to transform the shoe having a first heel into a shoe having a second heel by retracting the first heel and attaching the second heel over the retracted first heel. In one embodiment, the wearer transforms a shoe having a second heel back into a shoe having a first heel by removing the second heel and de-retracting the first heel. 
         [0036]    In an alternate embodiment, the wearer is able to select at least one second heel from a plurality of second heels. The plurality of second heels may consist of heels of the same style, but of different heights. Alternatively, the plurality of second heels may consist of heels of the same height, but of different styles. Alternatively, the plurality of second heels may consist of heels of different heights and styles. 
       The Interchangeable Heels of the Present Invention 
       [0037]    Any mechanism that enables a first heel to be interchanged with or replaced by a second heel is suitable for use in the present invention. Ideally, the heel, once in place on a shoe of the present invention should perform as if the heel were permanently attached. That is, the interchangeable heel of the present invention should attach firmly, and not be loose. Nor should the interchangeable heel of the present invention rotate, or otherwise move or detach from the shoe once in place on the shoe of the present invention, absent the wearer physically removing or replacing the heel. 
         [0038]    One of ordinary skill in the art can readily select the interchangeable heel suitable for use in the present invention. Factors that may be considered in the choice of interchangeable heel may include, but not be limited to, the final appearance of the shoe, the use for which the shoe is intended, and the like. 
         [0039]    An example of an interchangeable heel suitable for use in the present invention may be found in U.S. Pat. No. 3,581,413. 
         [0040]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Pat. No. 4,610,100. 
         [0041]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Pat. No. 4,670,996. 
         [0042]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Pat. No. 4,805,320. 
         [0043]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Pat. No. 4,910,885. 
         [0044]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Pat. No. 5,058,290. 
         [0045]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Pat. No. 5,079,857. 
         [0046]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Pat. No. 5,133,138. 
         [0047]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Pat. No. 5,309,651. 
         [0048]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Pat. No. 5,419,060. 
         [0049]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Pat. No. 5,581,910. 
         [0050]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Pat. No. D378548. 
         [0051]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Pat. No. 5,953,836. 
         [0052]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Pat. No. 6,631,570. 
         [0053]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Pat. No. 6,711,835. 
         [0054]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Pat. No. 7,059,068. 
         [0055]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Pat. No. 7,578,075. 
         [0056]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Pat. No. 7,877,902. 
         [0057]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Pat. No. 8,046,936. 
         [0058]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Pat. No. 8,112,908. 
         [0059]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Pat. No. 8,132,341. 
         [0060]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Patent Application US20010052195A1. 
         [0061]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Patent Application US20030154629A1. 
         [0062]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Patent Application US20080034620A1. 
         [0063]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Patent Application US20080235991A1. 
         [0064]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Patent Application US20080244931A1. 
         [0065]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Patent Application US20090183391A1. 
         [0066]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Patent Application US20100146817A1. 
         [0067]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Patent Application US20100139123A1. 
         [0068]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Patent Application US20110099841A1. 
         [0069]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Patent Application US20110119954A1. 
         [0070]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Patent Application US20120085000A1. 
         [0071]    Another example of an interchangeable heel suitable for use in the present invention may be found in U.S. Patent Application US20130019498A1 
         [0072]    Another example of an interchangeable heel suitable for use in the present invention may be found in PCT Application WO9108685A1. 
         [0073]    Another example of an interchangeable heel suitable for use in the present invention may be found in PCT Application WO9220248A1. 
         [0074]    Another example of an interchangeable heel suitable for use in the present invention may be found in PCT Application WO9307775A1. 
         [0075]    Another example of an interchangeable heel suitable for use in the present invention may be found in PCT Application WO05000062A1. 
         [0076]    Another example of an interchangeable heel suitable for use in the present invention may be found in PCT Application WO2008125705A1. 
         [0077]    Another example of an interchangeable heel suitable for use in the present invention may be found in PCT Application WO2013011213A1. 
         [0078]    Another example of an interchangeable heel suitable for use in the present invention is shown in  FIG. 1 . 
         [0079]      FIG. 1A  depicts a shoe of the present invention with a first heel attached. In this embodiment, the first heel is a “low-heel” type. The first heel is attached to a heel base. Also shown in  FIG. 1A  is an at least one expandable portion (indicated by the arrows labeled “EP”). 
         [0080]      FIG. 1B  depicts a shoe of the present invention with a second heel attached. In this embodiment, the second heel is a “high-heel” type. The second heel is attached to a heel base. Also shown in  FIG. 1B  is an at least one expandable portion (indicated by the arrows labeled “EP”). The expandable portion is smaller with respect to the portion shown in  FIG. 1A , corresponding to the change in shape of the upper, and the expandable portion has compensated for the change in shape of the upper. 
         [0081]    The mechanism by which the first and second heels attach to the heel base in this embodiment is shown in  FIG. 1C . The first and second heels each have a stabilizing rod that extends the entire length of the heel, and that protrudes above the top of the heel. 
         [0082]    The stabilizing rod may be reinforced to provide extra strength. The stabilizing rod, including the region that protrudes above the top of the heel may be of any shape. However, in the embodiment shown in  FIG. 1 , the stabilizing rod, including the region that protrudes above the top of the heel is square. 
         [0083]      FIG. 1C  shows that the heel base has a hollowed out region that corresponds to the dimensions of the stabilizing rod. When an interchangeable heel is attached, the portion of the stabilizing rod that extends beyond the top of the heel is inserted into the hollowed out region of the heel base. The shape of the stabilizing rod, therefore, allows the wearer to readily locate and properly align either the first or the second heel. The shape of the stabilizing rod also prevents either the first or the second heel from twisting out of place. One of ordinary skill in the art can readily appreciate that the stabilizing rod can be shaped in any fashion to facilitate proper alignment, location and prevention of twisting. For example, the stabilizing rod may be oval, oblong, or even circular. It can be desirable to have an additional element to keep a circular stabilizing rod with proper orientation, so that the heel does not rotate during use. Such elements may include additional locking rods that can be configured to pass through the heel base and the stabilizing rod. In yet further embodiments, a plurality of stabilizing rods can be used. In an alternate embodiment, an array of stabilizing rods (of circular, rectangular, triangular, oblong, oval, or other shape) can be used. One of ordinary skill in the art can configure a base and array of stabilizing rods to retain the heel in a desired orientation, to prevent the heel from rotating out of position during use. 
         [0084]    The embodiment shown in  FIG. 1C  shows a mechanism that locks an interchangeable heel in place once it is seated on the heel base, thereby securing the interchangeable heel to the shoe of the present invention. The first and the second heels have a spring-mounted button, located on the portion of the stabilizing rod that extends beyond the top of the heel. The heel base has a hole, or region that allows the spring-mounted button to be seated in the shoe of the present invention. The spring-mounted button indicates to the wearer that the interchangeable heel is properly located and attached. 
         [0085]    In one embodiment, the spring-mounted button is attached to a mechanism that locks the heel in place, once the heel is located in the heel base. The spring-mounted button may engage and disengage the locking mechanism. The choice of locking mechanism may be readily selected by one of ordinary skill in the art. 
         [0086]    The spring-mounted button may be made of any material, such as, for example, rubber, plastic, metal, and the like. The spring-mounted button may also display a logo or trademark to identify the source or origin of the shoes. 
         [0087]    In order to transform the shoe of the present invention, the user presses the spring-mounted button of the heel that is attached to the shoe, thereby detaching the heel. The user removes the heel from the shoe and locates another heel, aligning the heel using the portion of the stabilizing rod that extends beyond the top of the heel and the hollowed out region of the shoe base, and secures the heel in place. 
         [0088]    Another example of an interchangeable heel suitable for use in the present invention is shown in  FIG. 2 , wherein the wearer transforms a shoe having a first heel into a shoe having a second heel by retracting the first heel and attaching the second heel over the retracted first heel. In one embodiment, the wearer transforms a shoe having a second heel back into a shoe having a first heel by removing the second heel and de-retracting the first heel. 
         [0089]      FIG. 2A  depicts a shoe of the present invention with a first heel attached. In this embodiment, the first heel is a “low-heel” type. The first heel comprises a base and a housing, in which a spring is located. In the embodiment shown in  FIG. 2A , the base is made out of rubber. However, the base made be made out of any material. In the embodiment shown in the figure, the spring provides a force, maintaining the base in an extended position, allowing the wearer to walk on the base. The spring may be connected to a mechanism that locks the base in an extended position. 
         [0090]    The embodiment shown in  FIG. 2  also comprises a spring-mounted button. The spring-mounted button indicates to the wearer that the base is properly located and locked in place. 
         [0091]    In one embodiment, the spring-mounted button is attached to a mechanism that locks the base in place. The spring-mounted button may engage and disengage the locking mechanism. The choice of locking mechanism may be readily selected by one of ordinary skill in the art. 
         [0092]    The spring-mounted button may be made of any material, such as, for example, rubber, plastic, metal, and the like. The spring-mounted button may also display a logo or trademark to identify the source or origin of the shoes. 
         [0093]    In order to transform the shoe of the present invention, the user presses the spring-mounted button into the housing, thereby unlocking the base. The user then pushes on the base, pushing and retracting the base into the housing, thereby compressing the spring. The user then inserts a second heel into the open space that has been created by the base retracting into the housing, and thereby the base still further into the housing. 
         [0094]    In one embodiment, the second heel has a stabilizing rod that extends the entire length of the heel, and that protrudes above the top of the heel. The stabilizing rod may be reinforced to provide extra strength. The stabilizing rod, including the region that protrudes above the top of the heel may be of any shape. However, in the embodiment shown in  FIG. 2 , the stabilizing rod, including the region that protrudes above the top of the heel is oval. 
         [0095]    In one embodiment, the region of the stabilizing rod that protrudes above the top of the heel is inserted into the space in the housing created by the retracted base. The shape of the created space is dimensioned to exact dimensions of the region of the stabilizing rod that protrudes above the top of the heel. The shape of the stabilizing rod, therefore, allows the wearer to readily locate and properly align the second heel. The shape of the stabilizing rod also prevents the second heel from twisting out of place. One of ordinary skill in the art can readily appreciate that the stabilizing rod can be shaped in any fashion to facilitate proper alignment, location and prevention of twisting. For example, the stabilizing rod may be oval, oblong, or even circular. It can be desirable to have an additional element to keep a circular stabilizing rod with proper orientation, so that the heel does not rotate during use. Such elements may include additional locking rods that can be configured to pass through the heel and the stabilizing rod. In yet further embodiments, a plurality of stabilizing rods can be used. In an alternate embodiment, an array of stabilizing rods (of circular, rectangular, triangular, oblong, oval, or other shape) can be used. One of ordinary skill in the art can configure a heel and array of stabilizing rods to retain the heel in a desired orientation, to prevent the heel from rotating out of position during use. 
         [0096]    The embodiment shown in  FIG. 2B  shows a mechanism that locks the second heel in place once it is seated on the housing, thereby securing the second heel to the shoe of the present invention. The second heel has a spring-mounted button, located on the portion of the stabilizing rod that extends beyond the top of the heel. The housing onto which the second heel is located has a hole, or region that allows the spring-mounted button to be seated in the shoe of the present invention. The spring-mounted button indicates to the wearer that the second heel is properly located and attached. 
         [0097]    In one embodiment, the spring-mounted button is attached to a mechanism that locks the heel in place, once the heel is located in the heel base. The spring-mounted button may engage and disengage the locking mechanism. The choice of locking mechanism may be readily selected by one of ordinary skill in the art. 
         [0098]    The spring-mounted button may be made of any material, such as, for example, rubber, plastic, metal, and the like. The spring-mounted button may also display a logo or trademark to identify the source or origin of the shoes. 
         [0099]    Another example of an interchangeable heel suitable for use in the present invention is shown in  FIG. 3 , wherein the wearer transforms a shoe having a first heel into a shoe having a second heel by removing the first heel by twisting the heel to unlock the heel and removing the heel, and then twisting the second heel into position and locking the second heel in place. 
         [0100]    The top portion of  FIG. 3A  depicts a shoe of the present invention with a second heel attached. In this embodiment, the second heel is a “high-heel” type. The second heel is attached to a heel base. Also shown in  FIG. 3A  is an at least one expandable portion (indicated by the arrow labeled “EP”). 
         [0101]    The bottom portion of  FIG. 3A  depicts a shoe of the present invention with a first heel attached. In this embodiment, the first heel is a “low-heel” type. The first heel is attached to a heel base. Also shown in  FIG. 3A  is an at least one expandable portion (indicated by the arrows labeled “EP”). 
         [0102]    In the embodiment shown in  FIG. 3 , the first and second heels are attached to a heel base via a plate mechanism that provides the means to locate, align and lock the heels via a “push in and twist” operation. The heel base is modified to receive the top part of the plate mechanism, which may be affixed to the heel base by any means, such as, for example, glue, nails and the like. The first and second heels contain the corresponding bottom plate that locates, aligns and locks the heels via a “push in and twist” operation. An example of the plate mechanism suitable for use in the present invention is shown in  FIG. 3B-3D . 
         [0103]    In the embodiment shown on  FIG. 3 , the shoe has at least one expandable portion in the upper that either expands or contracts when the shoe transforms. When the shoe is in the “low-heel” configuration, the expandable portion is in an expanded position. When the shoe is on a “high-heel” configuration, the expandable portion in in a relaxed, or non-expanded position, and enclosed or covered up by the upper. 
         [0104]    The plate mechanism may be made of any material, such as, for example, plastic or metal. In one embodiment, the plate mechanism is made of plastic. 
         [0105]      FIG. 3B  shows an interchangeable heel with the bottom plate located on the top of the heel, which will contact the heel base. In one embodiment, the first and second heels each have a stabilizing rod that extends the entire length of the heel. The stabilizing rod may protrude beyond the top of the heel. In these embodiments, the plate mechanism is modified to accommodate the protruding stabilizing rod, and thereby provides extra stabilization for the heel. The stabilizing rod may be reinforced to provide extra strength. 
         [0106]      FIG. 3D  shows the corresponding top plate, into which the bottom plate is inserted. The plates are provided in such a way as to provide both halves of an engagement or locking device, wherein the wearer may locate, align and lock a heel via the operation outlined in  FIG. 3C . The wearer may reverse the operation to remove the heel. The engagement or locking device is fabricated to provide a means by which the heel is automatically locked in place via “teeth”. It can be appreciated that any desired number of such teeth can be used. For example, one, two, three, four, five or more can be used. 
         [0107]    In one embodiment, the teeth locate, align and lock a heel of the present invention to the shoe. 
         [0108]    Another example of an interchangeable heel suitable for use in the present invention is shown in  FIG. 4 , wherein the wearer transforms a shoe having a first heel into a shoe having a second heel by removing the first heel by sliding the heel to unlock and remove the heel, and then sliding the second heel into position and locking the second heel in place. 
         [0109]      FIG. 4A  depicts a side view of one particular configuration of elements that may be utilized in this embodiment. The embodiment comprises a base (which remains attached to the sole of the shoe at all times), which includes parts  1  and  2 . Parts  1  and  2  may be attached to the sole of the shoe by any suitable means, such as, for example using nails, screws, adhesives and the like. 
         [0110]    In the embodiment shown in  FIG. 4 , part  1  corresponds to the heel base and part  2  is part of a mechanism that locates, aligns and locks the heels onto the shoe. The remainder of the mechanism consists of part  3 . 
         [0111]    The interchangeable heels comprise parts  3 ,  4 , and  5 . Parts  4  and  5  form the “heel”, while part  3  is configured to locate, align and lock the heels onto the shoe, via part  2 . In one embodiment, the interchangeable heels each have a stabilizing rod that extends the entire length of the heel. The stabilizing rod may protrude beyond the top of the heel. In these embodiments, parts  2  and  3  are modified to accommodate the protruding stabilizing rod, and thereby provide extra stabilization for the heel. The stabilizing rod may be reinforced to provide extra strength. 
         [0112]      FIG. 4  B 1  and B 2  shows the operation wherein part  3  (also known as a “resilient element” which is fixed to the top of the heel attachment) can be recievably engaged with the bottom of the heel base. The heel base is shown having part  2  (also known as an “extending element”) below the shoe base and has lower portion having larger diameter than the remainder of the extending element. Part  2  is shown having a thinner aspect (toward the front of the shoe base). 
         [0113]    The interchangeable heel is aligned with the shoe base, and is moved forwards to engage part  2  of the shoe base. By moving the heel forward, part  3  slides forward and locks into place with part  2 . The slightly thicker frontmost portion of the top of part  3  creates tension when it slides over part  2 , and it is that tension which prevents the heel attachment from sliding back out without the wearer&#39;s deliberate operation. 
         [0114]    It can be appreciated that parts  2  and  3  may be made of metal, or other material, so long as part  3  has sufficient resiliency to be removably attached to the heel base. 
         [0115]      FIG. 4C  shows another view of this embodiment. In this embodiment, the extending portion of part  2  and receiving portion of part  3  are depicted having an oval shape, to reduce the likelihood of the heel being twisted out of proper orientation. 
         [0116]    In the embodiment shown in  FIG. 4 , one possible mechanism by which the wearer transforms a shoe of the present invention begins with the wearer having a shoe with an upper whose bottommost part is part  2 , and a removeable heel whose topmost part is part  3 . As seen in  FIG. 4B , the frontmost portion of part  3  is slid forward until it rests in a position where its enlarged front portion creates a tension which thereafter prevents the removeable heel from sliding back out without the wearer&#39;s deliberate operation. Similarly, to remove the heel, the wearer pulls backwards on part  4  with sufficient force to slide the frontmost portion of part  3  over the upward sloping portion of part  2 , until part  3  is moved to the back of the upper portion of the shoe, and disengaged from the upper portion of the shoe entirely. 
         [0117]    Another example of an interchangeable heel suitable for use in the present invention is shown in  FIG. 5 , wherein the wearer transforms a shoe having a first heel into a shoe having a second heel by removing the first heel by pulling down on the tip of the heel, displacing the interior stabilizing rod downward, unlocking the heel, and then sliding the heel toward the front of the shoe to remove the heel, and then sliding the second heel into position and locking the second heel in place. See, for example,  FIGS. 5A and 5B . 
         [0118]      FIGS. 5A and 5B  depict steps by which a wearer may transform one embodiment of the present invention. Step  1  shows a shoe of the present invention fully assembled, with the first heel attached. Step  2  shows the heel tip displaced downward, displacing the interior stabilizing rod (shown in  FIG. 5B ), thereby unlocking the first heel. Step  3  shows the first heel sliding out of the heel base. Step  4  shows the first heel fully disengaged from the shoe. The second heel is located onto the shoe of the present invention by reversing steps  1 - 4 . 
         [0119]    In the embodiment shown in  FIG. 5 , the first heel is attached to a heel base. The heel base and the top of the first heel is configured to automatically locate, align and situate the heel correctly. In this embodiment, the heel base is mortised and the top of the first heel is dovetailed to fit the mortise in the heel base exactly. The top of the second heel is also dovetailed to fit the mortise in the heel base exactly. In the embodiment shown, the first heel is positioned by sliding the heel rearward, from the front of the shoe, onto the heel base. The heel is removed from the heel base by sliding the heel forward off the heel base. See, for example,  FIG. 5C . 
         [0120]    The first and second heels each have a stabilizing rod that extends the entire length of the heel, and that protrudes above the top of the heel. The stabilizing rod may be reinforced to provide extra strength. The stabilizing rod, including the region that protrudes above the top of the heel may be of any shape. However, in the embodiment shown in  FIG. 5 , the stabilizing rod, including the region that protrudes above the top of the heel, is rectangular. 
         [0121]    The stabilizing rod is capable of being displaced downward, away from the top of the heel. In the embodiment shown, the stabilizing rod is held in first position by a spring, and is pulled downward by the wearer, toward a second position, placing the spring under tension. In the embodiment shown, the stabilizing rod is attached to the bottom tip of the heel, on which the wearer pulls to displace the stabilizing rod downward. However, one of ordinary skill in the art can readily envisage other mechanisms by which the user may displace the stabilizing rod. 
         [0122]    In the embodiment shown, when the first heel is correctly located in the heel base, the stabilizing rod is in its first position. The heel base has a hollowed out region that is dimensioned to permit the stabilizing rod to be in its first position, and the top-most portion of the stabilizing rod is located within the hollowed out portion. In the embodiment shown, the stabilizing rod&#39;s first position locks the first heel in place. See  FIG. 5D  and  FIG. 5E . 
         [0123]    In the embodiment shown in  FIG. 5 , one possible mechanism by which the wearer transforms a shoe of the present invention begins with a first step comprising the shoe of the present invention with a first heel in its locked, wearable position. The wearer transforms the shoe of the present invention by a second step, wherein the wearer pulls down on the heel tip, displacing the stabilizing rod downward, from a first position, to a second position, wherein the second position disengages the portion of the stabilizing rod that protrudes from the first heel into the shoe. Next, the wearer, in a third step, the wearer slides the first heel out from within its dovetail on the depicted shoe base, separating the first heel from the shoe entirely. Once removed, stabilizing rod returns to the first position, and the heel tip returns to its original position. Finally, the wearer slides the second heel onto the shoe base. 
         [0124]    The embodiment shown in  FIG. 5  shows one possible mechanism by which the stabilizing rod may be incorporated into a heel body of the present invention, and held in the first position, and moved to the second position. One of ordinary skill in the art, however, may readily appreciate different ways in which the stabilizing rod may be incorporated into a heel body of the present invention, and held in the first position, and moved to the second position. For example, in one alternate embodiment, the stabilizing rod may be incorporated into the heel body in a manner such that the stabilizing rod is moved between the first and second positions by the user grasping the heel body, thereby moving all of the heel body instead of the heel tip. For example, in one alternate embodiment, the stabilizing rod may be incorporated into the heel body in a manner such that the stabilizing rod is moved between the first and second positions by the user grasping the heel body, thereby moving a portion of the heel body instead of the heel tip. For example, in another alternate embodiment, the stabilizing rod may be moved between the first and second positions by the user moving a lever, connected to the stabilizing rod. The lever connected to the stabilizing rod may be further located within a grove or channel in the heel body. The groove or channel may further be configured to enable the stabilizing rod to be locked in the first position, the second position, or both the first and second positions. 
         [0125]    To transform the shoe from a shoe having a first heel to a shoe having a second heel, the wearer displaces the stabilizing bar downward to its second position, thereby removing the top-most portion of the stabilizing rod from within the hollowed out portion. The first heel is therefore unlocked and able to slide freely forward. In the embodiment shown, the heel base is configured in such a way that the stabilizing bar is maintained in the second position whilst the heel is being slid forward. 
         [0126]    A second heel, having a stabilizing rod that extends the entire length of the heel, and that protrudes above the top of the heel, is slid onto the heel base. In the embodiment shown, the heel base is configured in such a way that the stabilizing bar is maintained in the second position whilst the heel is being slid rearward. In the embodiment shown, when the second heel is correctly located in the heel base, the stabilizing rod moves to its first position. The heel base has a hollowed out region that is dimensioned to permit the stabilizing rod to be in its first position, and the top-most portion of the stabilizing rod is located within the hollowed out portion. In the embodiment shown, the stabilizing rod&#39;s first position locks the second heel in place. 
       Adaptations to the Shoe Components of the Present Invention 
       [0127]    In certain embodiments, particularly when the first heel and the second heel are of different heights, the transformation of the shoe results in changes in the shape of the shoe, the sole, the liner, the foot bed, the wearer&#39;s foot, or any combination thereof. The changes in shape may be, for example, a change (an increase or decrease) in volume of the shoe, an increase or decrease in the size of the shoe, an increase or decrease in the size, width, volume of the wearer&#39;s foot, or the position of the wearer&#39;s foot within the shoe, or any combination thereof. In these embodiments, the shoe of the present invention is able to compensate for these changes to facilitate or maintain wearer comfort. In these embodiments, the present invention provides a shoe wherein one, or more than one of the components of the shoe are adapted to allow a wearer to transform a shoe having a first heel into a shoe having a second heel. 
         [0128]    In one embodiment, the sole changes shape to conform to changes in the shape of the shoe that occur when the shoe transforms. In an alternate embodiment, the sole changes shape to conform to changes in the shape of the wearer&#39;s foot that occur when the shoe transforms. In an alternate embodiment, the sole changes shape to conform to both the changes in the shape of the shoe and changes in the shape of the wearer&#39;s foot that occur when the shoe transforms. 
         [0129]    In one embodiment, the shoe has an upper that is able to change shape when the shoe is transformed, in order to maintain or facilitate wearer comfort. In one embodiment, the upper changes shape to conform to changes in the shape of the shoe that occur when the shoe transforms. In an alternate embodiment, the upper changes shape to conform to changes in the shape of the wearer&#39;s foot that occur when the shoe transforms. In an alternate embodiment, the upper changes shape to conform to both the changes in the shape of the shoe and changes in the shape of the wearer&#39;s foot that occur when the shoe transforms. 
         [0130]    In one embodiment, the shoe has a liner that is able to change shape when the shoe is transformed, in order to maintain or facilitate wearer comfort. In one embodiment, the liner changes shape to conform to changes in the shape of the shoe that occur when the shoe transforms. In an alternate embodiment, the liner changes shape to conform to changes in the shape of the wearer&#39;s foot that occur when the shoe transforms. In an alternate embodiment, the liner changes shape to conform to both the changes in the shape of the shoe and changes in the shape of the wearer&#39;s foot that occur when the shoe transforms. 
         [0131]    In one embodiment, the shoe has a foot bed that is able to change shape when the shoe is transformed, in order to maintain or facilitate wearer comfort. In one embodiment, the foot bed changes shape to conform to changes in the shape of the shoe that occur when the shoe transforms. In an alternate embodiment, the foot bed changes shape to conform to changes in the shape of the wearer&#39;s foot that occur when the shoe transforms. In an alternate embodiment, the foot bed changes shape to conform to both the changes in the shape of the shoe and changes in the shape of the wearer&#39;s foot that occur when the shoe transforms. 
       The Sole and Foot Bed 
       [0132]    Soles may be made from a variety of materials, such as, for example, natural rubber, polyurethane, or polyvinyl chloride (PVC) compounds. One of ordinary skill in the art can readily select the material to form the sole of a shoe of the present invention. Factors that may be considered in the choice of material may include, but not be limited to, the final appearance of the shoe, the use for which the shoe is intended, and the like. 
         [0133]    Soles suitable for use in the present invention may be simple, comprising a single material in a single layer. Alternatively, soles suitable for use in the present invention may be complex, with multiple structures or layers and materials. When various layers are used, soles may consist of an insole, midsole, and an outsole. 
         [0134]    The insole is the interior bottom of a shoe, which sits directly beneath the foot under the foot bed (also known as sock liner). The purpose of insole is to attach to the lasting margin of the upper, which is wrapped around the last during the closing of the shoe during the lasting operation. While the insole may be made from any material suitable for use in a shoe, they are usually made of cellulosic paper board or synthetic non woven insole board. 
         [0135]    The outsole is the layer in direct contact with the ground. Dress shoes often have leather or resin rubber outsoles; casual or work-oriented shoes have outsoles made of natural rubber or a synthetic material like Polyurethane. The outsole may comprise a single piece, or may be an assembly of separate pieces of different materials. 
         [0136]    In one embodiment, the present invention provides a shoe wherein the sole has been modified to allow the sole to change shape when the shoe is transformed, in order to maintain or facilitate wearer comfort. Any modification that enables the sole to change shape when the shoe transforms is suitable for use in the present invention. For example, the modification may comprise a hinge or a flexible portion in one, or more than one portion of the sole. An example of a sole suitable for use in the present invention may be found in U.S. Pat. No. 5,309,651. 
         [0137]    Another example of a sole suitable for use in the present invention may be found in U.S. Pat. No. 4,910,885. 
         [0138]    Another example of a sole suitable for use in the present invention may be found in U.S. Patent Application 20010052195A1. 
         [0139]    Another example of sole suitable for use in the present invention may be found in U.S. Patent Application 20100139123A1. 
         [0140]    Another example of a sole suitable for use in the present invention may be found in U.S. Patent Application 20110119954A1. 
         [0141]    In one embodiment of the present invention, the shoe also comprises a foot bed that is seated on the sole of the shoe, onto which the wearer&#39;s foot rests when the shoe is worn. In one embodiment, the foot bed is able to change shape when the shoe is transformed, in order to maintain or facilitate wearer comfort. In one embodiment, the foot bed changes shape to conform to changes in the shape of the shoe that occur when the shoe transforms. In an alternate embodiment, the foot bed changes shape to conform to changes in the shape of the wearer&#39;s foot that occur when the shoe transforms. In an alternate embodiment, the foot bed changes shape to conform to both the changes in the shape of the shoe and changes in the shape of the wearer&#39;s foot that occur when the shoe transforms. 
         [0142]    The foot bed may be made from any material, provided the material is able to perform as intended in the present invention. One of ordinary skill in the art can readily select the material to form the sole of a shoe of the present invention. Factors that may be considered in the choice of material may include, but not be limited to, the final appearance of the shoe, the use for which the shoe is intended, and the like. An example of a foot bed, and methods for constructing a foot bed suitable for use in the present invention may be found in U.S. Pat. No. 5,150,490. 
       The Upper 
       [0143]    Every shoe has an upper part that helps hold the shoe onto the foot. In the simplest cases, such as sandals or flip-flops, this may be nothing more than a few straps for holding the sole in place. Closed footwear, such as boots, sneakers and most men&#39;s shoes, will have a more complex upper. This part is often decorated or is made in a certain style to look attractive. The upper is connected to the sole by a strip of leather, rubber, or plastic that is stitched between it and the sole, known as a welt. As used herein, the term “upper” refers to the part or parts of a shoe that cover all, parts of the toes, the top of the foot, the sides of the foot, and the back of the heel, or any combination thereof, and is attached to the outsole of the shoe. 
         [0144]    Depending on the style of the shoe, the upper can be cut from a single piece, or, alternatively, can be comprised of many pieces stitched together. One of ordinary skill in the art can readily select the material to form the upper of a shoe of the present invention. Factors that may be considered in the choice of material may include, but not be limited to, the final appearance of the shoe, the use for which the shoe is intended, and the like. The upper can be made from a variety of materials such as, for example, leather, satin, suede, or canvas. 
         [0145]    In one embodiment, the shoe has an upper that is able to change shape when the shoe is transformed, in order to maintain or facilitate wearer comfort. In one embodiment, the upper changes shape to conform to changes in the shape of the shoe that occur when the shoe transforms. In an alternate embodiment, the upper changes shape to conform to changes in the shape of the wearer&#39;s foot that occur when the shoe transforms. In an alternate embodiment, the upper changes shape to conform to both the changes in the shape of the shoe and changes in the shape of the wearer&#39;s foot that occur when the shoe transforms. 
         [0146]    In one embodiment, the upper contains at least one expandable portion within the upper that enables the upper to change shape according to the methods of the present invention. The at least one expandable portion may be incorporated into the upper where the upper changes shape when the shoe of the present invention transforms. 
         [0147]    In one embodiment, the expandable portion is formed from an elastomeric material. In one embodiment, the entire upper is an elastomeric material. 
         [0148]    Examples of an upper containing an expandable portion may be found in U.S. Pat. No. 7,059,068. 
         [0149]    In one embodiment, the upper of a shoe of the present invention contains the at least one expandable portion disclosed in  FIG. 1 . The at least one expandable portion is an portion of the upper that is capable of expanding or contracting when the shoe of the present invention transforms. 
         [0150]    When the shoe of the present invention is in the low heel configuration, the upper is under tension and stretches, and the at least one expandable portion expands, permitting the upper to increase in length. See  FIG. 1A  Low-Heel Setting. When the shoe of the present invention is in the high heel configuration, the upper flexes and the tension decreases. The at least one expandable portion contracts, allowing the upper to decrease in length. See  FIG. 1A  High-Heel Setting. 
         [0151]    In one embodiment, the at least one expandable portion is an elastic fabric that is attached to the upper in a region where the upper changes shape when the shoe of the present invention transforms. The elastic fabric may be attached to the upper using stitching, adhesives or other means. The at least one expandable portion can be colored to a similar color as the remainder of the upper. Alternatively, if desired, the expandable portion may be of a different color. 
       The Lining 
       [0152]    In one embodiment, the present invention provides a shoe with a liner that is able to conform to the changes in the wearer&#39;s foot that occur when the shoe is transformed, in order to maintain or facilitate wearer comfort. 
         [0153]    The liner may be made of any material that is capable of conforming to the shape of the wearer&#39;s foot. Ideally, the lining is resilient enough to provide padding for the foot, whilst still able to conform to the changes in the shape of the wearer&#39;s foot when the shoe transforms. In one embodiment, the lining is also able to conform to the changes in the shape of the shoe when the shoe transforms. 
         [0154]    Examples of materials suitable for forming the lining of the shoe of the present invention include, but are not limited to, foams, elastomeric foams, memory foams, gels, felt, and the like. 
         [0155]    Publications cited throughout this document are hereby incorporated by reference in their entirety. Although the various aspects of the invention have been illustrated above by reference to examples and preferred embodiments, it will be appreciated that the scope of the invention is defined not by the foregoing description but by the following claims properly construed under principles of patent law.