Patent Publication Number: US-2003227153-A1

Title: Shoes with roller device

Description:
CROSS REFERENCE TO RELATED APPLICATION  
       [0001] This application claims the benefit of the Korean Application No. P10-2001-0070569 filed on Nov. 13, 2001 which is hereby incorporated by reference.  
       BACKGROUND OF THE INVENTION  
       [0002] 1. Field of the Invention  
       [0003] The present invention relates to a shoe with a roller device, and more particularly, to a shoe with a roller device in which a wheel assembly protrudes out of the shoe toward the ground for in-line skating or roller blading as needed. The wheel assembly retracts so that the shoe may be as an ordinary shoe in ordinary times.  
       [0004] 2. Discussion of the Related Art  
       [0005] An in-line skate, which is generally called a roller blade, is widely used by people of various ages, including children, for sports or recreation, etc. The in-line skate as shown in FIG. 1 includes a boot type shoe  1 , which a user wears, and a wheel blade assembly  2  fixably installed on the bottom of the shoe  1 . The wheel blade assembly  2  includes a runner or a blade  3  fixably installed in the boot  1 , and four or five of rollers or wheels  5  rotatably fixed to the blade  3  by a shaft  4  with uniformly distanced each other. According to the structure as above, a user who wears the boot  1  can play roller blading or in-line skating just like ice-skating.  
       [0006] However, skating as described above results in many inconveniences and problems. First, a user can normally enjoy skating only on rigid and flat paved ground such as asphalt or concrete, etc. Next, it is inconvenient to carry; a user always carries an in-line skate separately, and thus, after playing skating or when passing through a non-flat area, he or she takes off his or her shoes and changes into ordinary shoes. That is, the user must change his or her shoes depending on whether he or she must wear either an in-line skate or an ordinary shoe. Thus, the user must carry the one not being used, which is inconvenient. There is also the extra expense of purchasing two separate pairs of shoes.  
       [0007] The U.S. Pat. No. 6,042,125 discloses a boot in which a roller device is equipped when necessary and which can be also used as an in-line skate. The in-line skate has a roller device detachably installed therein. However, the in-line skate is not easy for a user to handle, and its outer look is not compact so that the wearing of the skate as an ordinary shoe brings difficult problems.  
       SUMMARY OF THE INVENTION  
       [0008] Accordingly, the present invention is directed to a shoe with a roller device that substantially obviates one or more problems due to limitations and disadvantages of the related art.  
       [0009] An object of the present invention is to provide a shoe with a roller device, which can be used as an ordinary shoe in the case of walking, and as a roller blade in the case of in-line skating.  
       [0010] Another object of the present invention is to provide a shoe with a roller device, which can be rapidly changed to the function of either an ordinary shoe or an in-line skate.  
       [0011] A further object of the present invention is to provide a shoe with a roller device, which is light in weight and stable.  
       [0012] Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.  
       [0013] To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, a shoe with a roller device includes a main body including a body part to receive the foot of a user and an sole integrally formed with the bottom of the body part and having a receiving groove in the vertical direction. In addition, the shoe may include a roller device, and the roller device includes a housing placed inside the sole, a stopper provided in the housing to movably reciprocate back and forth, a first wheel assembly movably fixed to the front of the housing and fixed to maintain the state for use in an ordinary shoe or for use in an in-line skate by the stopper, and a second wheel assembly provided on the back of the housing, movably fixed in the direction confronting with the moving direction of the first wheel assembly, and fixed to maintain the state for use in an ordinary shoe or for use in an in-line skate by the stopper. In addition, the shoe includes controller for controlling the movement of the stopper of the roller device.  
       [0014] It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.  
     
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
     [0015] The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principle of the invention. In the drawings:  
     [0016]FIG. 1 is a side view of a conventional general in-line skate;  
     [0017]FIG. 2 is a perspective view of a shoe with a roller device of the present invention showing the state that a wheel assembly of the shoe is protruded;  
     [0018]FIG. 3 is an exploded perspective view of a roller device employed in the shoe of FIG. 2;  
     [0019]FIG. 4 is a detailed perspective view of a stopper of the roller device of FIG. 3;  
     [0020]FIG. 5 is a front perspective view of a first link of each wheel assembly of the roller device of FIG. 3;  
     [0021]FIG. 6 is a back perspective view of the first link of FIG. 5;  
     [0022]FIG. 7 is a perspective view showing the structure of a side part of a second link of each wheel assembly of the roller device of FIG. 3;  
     [0023]FIG. 8 is an exploded perspective view of a switch employed in the roller device of FIG. 3;  
     [0024]FIG. 9 is a perspective view of a brake employed in the main body;  
     [0025]FIG. 10 a side view of the state of the roller device when the shoe is used as an ordinary shoe;  
     [0026]FIG. 11 is a side view of the moving state of the stopper when the shoe is changed from an ordinary shoe to an in-line skate;  
     [0027]FIG. 12 is a side view of the state of the roller device for use in skating;  
     [0028]FIG. 13 is a perspective view of the installed state of the brake for use in skating;  
     [0029]FIG. 14 is an exploded perspective view of the roller device employed in the shoe according to another embodiment of the present invention;  
     [0030]FIG. 15 is a detailed perspective view of the stopper of the roller device of FIG. 14;  
     [0031]FIG. 16 is a side view of the state of the roller device for use in an ordinary shoe;  
     [0032]FIG. 17 is a side view of the moving state of the stopper when the shoe is changed from an ordinary shoe to an in-line skate;  
     [0033]FIG. 18 is a side view of the state of the roller device for use in skating; and  
     [0034]FIG. 19 is a perspective view of the state that the wheel completely protrudes from the bottom of the shoe for use in skating. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION  
     [0035] Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.  
     [0036] First, referring to FIGS. 2 and 4, a shoe provided with a roller device of the present invention includes a main body  10  which the foot of a user is put into when he or she wears the shoe. The main body  10  includes a body part  12  in which the foot of the user is placed in the shoe, and a bottom or a sole  14 , which is integrally formed with the lower side of the body part  12 . In particular, the sole  14  includes a receiving groove  16  for receiving the roller device, which is described later in detail, and an installation hole  18  into which a switch operation in combination with the roller device is inserted to control the roller device.  
     [0037] Particularly, a roller device  20  is inserted into the receiving groove  16  formed on the sole  14  of the main body  10 . The roller device  20  is provided with a housing  22  fixed and inserted into the main body  10 . The housing  22  is generally formed in the form of a cubical rectangle, and its bottom is completely open. In the both sides of the housing  22 , there are provided a plurality of installation holes  24 , 26 , 28 , 30  symmetrical to each other to install each of the links forming a wheel assembly, which is described later. In particular, it is preferable to form a fixing groove  24   a,    28   a  on the installation holes  24 ,  28  to elastically install a coil spring provided in the link, which is described later in detail. An installation hole  32  is formed penetratingly at the center of one of the both sides to install a handle. The installation hole  32  communicates with an installation hole  18  of the sole. In addition, it is preferable to install a reinforcing member  34  at the center of the both sides of the housing  22  so that its two ends are fixed to the both sides of the housing  22 .  
     [0038] On the front sidewall of the housing  22 , there is provided an opening  36  so that the front end of the stopper of the roller device can enter, and on the back sidewall of the housing  22 , there is provided another opening  38  so that the switch in the stopper is inserted reciprocally. In addition, on the inner both sidewalls of the housing  22 , there are provided three pin fixing grooves  40 ,  42 ,  44  formed in the form of a pair confronting each other. Pins  46 , 48 , 50  are respectively inserted and fixed to the pin fixing grooves  40 ,  42 ,  44  formed in the form of a pair.  
     [0039] A stopper  52  is reciprocally inserted into the housing  22  within a predetermined range. Fixing plates  54 ,  56  are equipped on the bottom of both ends of the stopper  52  respectively. The front end of the stopper  52  can be inserted into one opening  36  of the housing  22  when the stopper  52  moves forwardly, and the back end can be inserted into the other opening  38  when the stopper  52  moves backwardly. Accordingly, the stopper  52  can be reciprocally inserted into the housing  22 .  
     [0040] At the center of the housing  22 , there is provided a sliding part  62  integrally formed with a predetermined size. The sliding part  62  has a plurality of grooves  60  formed at a constant interval. A spring fixing piece  64  is integrally protruded at a selected location of one side of the housing  22 . To the spring fixing piece  64  is fixed one side of the spring  66  while the other side of the spring  66  is fixed to one of the pins  46  provided in the housing  22 . Structured as above, the housing  22  and the stopper  52  are elastically connected by the spring  66 .  
     [0041] In addition, two fixing pieces  68 ,  70  as a pair protrude downward and toward the lateral side at both sides apart by a certain distance from the both sides of the stopper  52  to stably fix each of the links, which will be described.  
     [0042] A first wheel assembly  72  is provided on the inner front of the housing  22  under the stopper  52  to be able to protrude. The first wheel assembly  72  has a first link  74  to be movably fixed to the housing  22 . As shown in FIGS. 5 and 6, it is preferable that the first link  74  is elastically and movably fixed to the installation hole  24  formed on the both sides of the housing  22  by a fixing rod  76  and the coil spring  78  provided on the both ends of the fixing rod  76 . Here, the both ends  78   a  of the coil spring  78  is fixed to the fixing grove  24 a of the installation hole  24  to provide the elastic force to the fixing rod. In particular, a first contact part  80  is formed on the generally upper both sides of the first link  74 , and the first contact part  80  contacts the fixing plate  54  formed on the front end of the stopper  52  when a user uses the shoes of the present invention as ordinary shoes. On the other side, there is provided a second contact part  82  on which the fixing plate  54  of the stopper  52  is mounted to stably support a link when a user tries to protrude the roller assembly to play in-line skating or roller blading. In addition, on one end of the first link  74  is rotatably fixed a wheel or roller  84  to be actually driven to roll on the ground by a fixing bolt  86  and a nut  88 .  
     [0043] The first wheel assembly  72  has a second link  90  to be actively connected to the first link  74 . As shown in FIG. 7, a fixing piece  92  is integrally formed on the upper side of the second link  90  to be movably fixed to another installation hole  26  formed on the both sides of the housing  22 . In particular, on one upper side of the second link  90  is provided a contact part  94  to contact one fixing piece  68  formed on the front side of the stopper  52  when a user tries to use the shoes of the present invention as ordinary shoes. On one end of the second link  90  is rollably fixed a roller or a wheel  96  by a fixing bolt  98  and a nut  100 .  
     [0044] In particular, the first link  74  and the second link  90  are preferably connected each other to be mutually and simultaneously used and driven.  
     [0045] In addition, on the back of the housing  22  is provided a second wheel assembly  104  which has the same structure as that of the first wheel assembly  72  but is placed opposite. The second wheel assembly  104  has a first link  106  to be rotatably fixed to the housing  22 . The first link  106  is preferably fixed elastically and rotatably to the installation hole  28  formed on the both side of the housing  22  by fixing rod  108  and coil spring  110  provided on both ends of the fixing rod  108 . Here, both ends  110   a  of the coil spring  110  are fixed to the fixing groove  28   a  of the installation hole  28 , thereby providing elastic force to the fixing rod  108 . Especially as shown in FIGS. 5 and 6, on one upper side of the first link  106  is provided a first contact part  112  to contact the other fixing plate  56  formed on back end of the stopper  52  when a user tries to use the shoes of the present invention as ordinary shoes, and on the opposite side is provided a second contact part  114  on which the fixing plate  56  of the stopper  52  is installed to stably support the link when the user tries to protrude the roller assembly to play in-line skating or roller blading. In addition, on one end of the first link  106  is fixed a wheel or a roller  116  to be actually driven to roll on the ground by a fixing bolt  118  and a nut  120 .  
     [0046] The second wheel assembly  104  has a second link  122  to be actively connected to the first link  106 . On the upper both sides of the second link  122  is integrally fixed a fixing piece  124  to be movably fixed on another installation hole  30  formed on both sides of the housing  22 . Especially, on one upper side of the second link  122  is provided a contact part  126  to contact another fixing piece  70  formed on the back side of the stopper  52  when a user tries to use the shoes as ordinary shoes. On one end of the second link  122  is rollably fixed a wheel or a roller  128  by a fixing bolt  130  and a fixing nut  132 .  
     [0047] In particular, the first link  106  and the second link  122  are preferably connected each other by a guide  134  to be mutually and simultaneously used and driven.  
     [0048] On one side of the housing  22  is provided a switch  136  to control the stopper  52  so that each roller is protruded or withdrawn by driving or moving the wheel assemblies  72 ,  104 . As shown in FIG. 8, the switch  136  preferably includes a handle  138  which a user can hold and rotate, and a rod  144  inserted into installation holes  18 ,  32  provided on each of one side of the sole  14  of the main body  10 , and one end of the rod  144  is fixed on the handle  138  by a bolt  140 , and the other end of the rod  144  includes a gear  142  to fit to each of the grooves  60  provided on the sliding part  62  of the stopper  52 . As constructed above, the stopper  52  can move back and forth in accordance with the rotation direction of the handle  138 .  
     [0049] As shown in FIGS.  10  to  12 , the first wheel assembly  72  and the second wheel assembly  104  are connected each other by a driving device  146  to be driven simultaneously and mutually. The driving device  146  is preferably comprised of two wires, i.e., a first wire  148  and a second wire  150 . In detail, one end of the first wire  148  is fixed to a fixing piece  90   a  provided at the center of one side of the second link  90  of the first wheel assembly  72 , and the other end of the first wire  148  is fixed to a fixing piece  122   b  provided at the upper side of one side of the second link  122  of the second wheel assembly  104 . One end of the second wire  150  is fixed to a fixing piece  90   b  provided on the upper side of the other side of the second link  90  of the first wheel assembly  72 , and the other end of the second wire  150  is fixed to a fixing piece  122   a  provided at the center of the other side of the second link  122  of the second wheel assembly  104 . As constructed above, the wires  148 ,  150  cross each other. The reason is to make them easily driven in the mutually confronting state when changing to the states of either ordinary shoes or shoes for skating or blading. In other words, the second links  90 ,  122  of the wheel assemblies  72 ,  104  are operated mutually as a seesaw or a lever so that they are driven in the opposite directions from each other or confronting direction.  
     [0050] Selectively, in the shoe with a roller device of the present invention, as shown in FIG. 9, a detachable brake  152  is preferably provided. The brake  152  includes a body part  156  having a support groove  154  in contact with the bottom of the sole  14 , that is, a bottom of the shoe when installed. On the front of the support groove  154  of the body  156  is provided a fixing member  158  inserted between the back end of the housing  22  and the second link  122  of the second wheel assembly  104 , and connected thereto with protruded. On the front both sides is integrally formed a protrusion piece  160  to prevent the entire brake  152  from shaking right and left or moving. On the bottom of the body part  156  is provided a stopper  162  to generate a braking force by abrasion when in contact with the ground. The stopper  162  is preferably comprised of a rubber or synthetic resin to provide an abrasive force and some elastic force, and is also preferably detachably fixed to the body  156  to exchange when it wears out. As shown in FIGS.  14  to  18 , the shoe with a roller device according to another embodiment of the present invention has a button  58  provided at the back side of the stopper integrally formed to operate the stopper in the back of the body part. The button  58  is inserted into another opening  38  provided on the back of the housing  22  to be movable back and forth.  
     [0051] As constructed above, since the button  58  is provided on the back of the stopper  52  to control the movement of the stopper, the sliding part provided on one side of the stopper  52  of the first embodiment can be omitted. In addition, because the sliding part of the stopper is omitted, a switch to fit the groove of the sliding part to control the stopper can be also omitted.  
     [0052] Hereinafter, the manner of using the shoe with a wheel blade device as structured above, and its driving mode are described.  
     [0053] First, when a user uses the shoes as ordinary shoes as shown in FIG. 10, each wheel assembly  72 ,  104  is inserted into the groove  16  provided on the sole  14  of the body  10  to maintain the state that the bottom of the sole  14  contacts the ground. In this state, contact parts  80 ,  112  of first links  74 ,  106  of each wheel assembly  72 ,  104  are in contact with the fixing plates  54 ,  56  provided on the bottom of both side ends of the stopper  52  and are fixed. In addition, fixing pieces  68 ,  70  are formed with protrusions on each of the both sides of the stopper  52  and are in contact with and fixed to the contact parts  94 ,  126  of the second link  90 ,  122  of each of the wheel assembly  72 ,  104 . In this state, the stopper  52  is generally fixed at the center. The gear  142  of the switch  136  to control the stopper  52  is in a state to fit each groove  60  provided at the center of the sliding part  62 .  
     [0054] In the normal state as above, a user, who enjoys skating or blading, drives each wheel assembly  72 ,  104  to make each of the rollers  84 ,  96 ,  116 ,  128  provided therein protruded out of the receiving groove  16  of the sole  14  to be rollable and to contact them with the ground. In more detail, if a user holds the handle  138  of the switch  136  provided on the side of the sole  14  with protruded, and turns it in an A1 direction as shown in FIG. 11, stopper  52  moves forward in an A2 direction by gear  142  connectively installed to the handle. As such, if the stopper  52  moves forward, each of the fixing plates  54 ,  56  of the stopper  52  is removed from the first contact parts  80 ,  112  of the first links  74 ,  106  of the wheel assemblies  72 ,  104 . In addition, the contact parts  94 ,  126  of the second links  90 ,  122  of each of the wheel assemblies  72 ,  104  are removed from the fixing pieces  68 ,  70  protruding on both sides of the stopper  52 .  
     [0055] As such, if the stopper is moved and each link is removed therefrom, each fixing rod  76 ,  108  supports each first link  74 ,  106  rotating by the elastic force of the coil spring  78 ,  110 . At the same time, each first link  74 ,  106  is fixed to the fixing rod and is driven in A3 and A4 directions. Together with this, the second link  90 ,  122  connected to the first link  74 ,  106  by each guide  102 ,  134  is driven in the same direction. Each of the second link  90 ,  122  is rotated by way of a mutual cross of the first wire  148  and the second wire  150  forming driving device  146  and by a seesaw type so that the rotation force is symmetrically and uniformly applied and it is driven exactly and easily.  
     [0056] As such, if each of the wheel assemblies  72 ,  104  is rotated and each of rollers  84 ,  96 ,  116 ,  128  is completely protruded as shown in FIG. 12, the stopper  52  is moved backwardly, that is, in an A5 direction by elastic spring  66 . If the stopper  52  is completely moved backwardly, each of fixing plates  54 ,  56  provided on the front and the back of the stopper  52  contacts the second contact parts  82 ,  114  of the first links  74 ,  106  of each of the wheel assemblies  72 ,  104 . The switch  136  is driven along with the movement of the stopper  52 , and is automatically rotated in the arrow direction as shown in FIG. 12. Selectively or abnormally, in case that the elastic force of the elastic spring  66  is decreased, and the stopper  52  cannot move backwardly easily or completely, the stopper  52  can be forcibly moved by using the handle  138  of the switch  136 . In this state, a user plays skating or blading stably.  
     [0057] Selectively, to enjoy more stable skating, the user installs brake  152  at the back of the sole  14 . In case of installing the brake  152 , it should be installed at the back end of the sole  14  before driving the wheel assembly and protruding the roller as described above. That is, if a user holds the body part  156  of the brake  152 , and inserts the support groove  154  into the back end of the receiving groove  16  of the sole  14 , and drives the wheel assembly described above, the fixing member  158  is inserted between the back end of the housing  22  and the second link  122  of the second wheel assembly, and fixed. In addition, the brake  152  is prevented from shaking right and left or from moving by the protrusion piece  160 . As described above, if the brake  152  is installed, braking force by abrasion is provided and the stopper  162  can be contacted with the ground in an emergency and reducing speed thus enabling the user to play skating or blading more stably.  
     [0058] On the contrary, after playing skating, the shoes with a roller device as above can be also used as ordinary shoes. In this case, if a user holds the handle  138  of the switch  136  and rotates in the A1 direction as shown in FIG. 11, the stopper  52  moves forwardly in the A2 direction by the gear  142  connectively installed on the handle. As such, if the stopper  52  moves forwardly, each of the fixing plates  54 ,  56  of the stopper  52  is removed from the second contact parts  82 ,  114  of the first links  74 ,  106  of the wheel assemblies  72 ,  104 . In the state that the first links  74 ,  106  are removed from the stopper  52 , if each of the wheels  84 ,  96 ,  116 ,  128  is suppressed, each of the first links  74 ,  106  and the second links  90 ,  122  connected to the first links  74 ,  106  by the guides  102 ,  134  are moved in A6 and A7 directions, and back to the original location. In this state, each of the second links  90 ,  122  can be driven easily and exactly by the rotation force of the first wire  148  and the second wire  150  of the driving device  146 , which is symmetrically and uniformly applied.  
     [0059] After that, if the user puts down the handle  138  of the switch  136 , the stopper  52  moves back to the original location by the elastic spring  66 . If the stopper  52  moves back to the original location, as shown in FIG. 10, each of the wheel assemblies  72 ,  104  is completely inserted into the receiving groove  16  so that the first contact parts  78 ,  110  of each of the first links  74 ,  106  is placed in contact with the fixing plates  54 ,  56  provided under the both sides of the stopper  52 . The contact parts  94 ,  126  of the second links  90 ,  122  of each of the wheel assemblies  72 ,  104  is also placed in contact with the fixing pieces  68 ,  70  provided on the both sides of the stopper  52  with protrusions so as to maintain its fixing state with each link laid and to enable the user to put in the shoe. If the brake  152  is installed, it is better to use as an ordinary shoe after the brake  152  is separated from the sole  14 .  
     [0060] In a shoe with a roller device of another embodiment of the present invention, a user can directly operate the stopper by using a button integrally formed with the stopper to use as an ordinary shoe or an in-line skate. That is, in the case that a user uses the present invention as an ordinary shoe, each of the wheel assemblies  72 ,  104  is completely inserted into the groove  16  provided on the sole  14  of the body  10  as shown in FIG. 16, and the bottom of the sole  14  is maintained to contact the ground. In this state, first contact parts  80 ,  112  of the first links  74 ,  106  of each of the wheel assemblies  72 ,  104  is fixed and in contact with the fixing plates  54 ,  56  provided under the both sides of the stopper  52 . In addition, the contact parts  94 ,  126  of the second links  90 ,  122  of each of the wheel assemblies  72 ,  104  is in contact with the fixing pieces  68 ,  70  with protrusions formed on the both sides of the stopper  52 , and maintains its fixing state. In this state, the stopper  52  is fixed at the center of the stopper  52 . The button  58  to control the stopper  52  is provided inside the opening  38  on the back side of the housing  22 .  
     [0061] If a user tries to play skating or blading, each of wheel assemblies  72 ,  104  should be driven, and each of rollers  84 ,  96 ,  116 ,  128  provided in the wheel assemblies  72 ,  104  should be protruded out of the receiving groove  16  of the sole  14  to be in contact with the ground and rollable. To realize this, if a user pushes the button  58  integrally formed with the back end of the stopper  52  in the A1 direction as shown in FIG. 17, the stopper  52  can move forward in the A2 direction. Therefore, each of fixing plates  54 ,  56  of the stopper  52  is removed from the first contact parts  80 ,  112  of the first links  74 ,  106  of the wheel assemblies  72 ,  104 , and the contact parts  94 ,  126  of the second links  90 ,  122  of each of the wheel assemblies  72 ,  104  is removed from the fixing pieces  68 ,  70  protruded from the both sides of the stopper  52  respectively.  
     [0062] As described above, if the stopper is moved and removed from each of the links, each of the fixing rods  76 ,  108  to support each of the first links  74 ,  106  is rotated by the elastic force of the coil springs  78 ,  110 , and each of the first links  74 ,  106  fixed to the fixing rod is driven in the A3 and A4 directions. Also, second links  90 ,  122  are connected to the first links  74 ,  106  by guides  102 ,  134  and can be driven in the same direction. Each of the second links  90 ,  122  is rotated in the manner of the mutual crossing of the first wire  148  and the second wire  150  forming a mutual driving device  146  or by a seesaw type so that the rotation force is symmetrically and uniformly applied to be exactly and easily driven.  
     [0063] As such, if each of the wheel assemblies  72 ,  104  is driven and each roller  84 ,  96 ,  116 ,  128  is completely protruded as shown in FIG. 12, the stopper  52  moves backwardly, that is, in the A5 direction by the elastic spring  66 . If the stopper  52  moves backwardly completely, each of the fixing plates  54 ,  56  provided on the front and back side of the stopper  52  is contacted to the second contact parts  82 ,  114  of the first links  74 ,  106  of each of the wheel assemblies  72 ,  104 . In this case, the button  58  moves in the A8 direction driven along with the movement of the stopper  52 . In case that the elastic force of the elastic spring  66  is decreased selectively or abnormally, and the stopper  52  cannot move backwardly easily and completely, the stopper  52  can be forced to move by using the button  58 . As such, a user can play skating or blading as shown in FIG. 19.  
     [0064] To enjoy the more stable skating, the brake  152  can be installed on the back side of the sole  14  as described above.  
     [0065] After finishing skating, a user can use the shoes as ordinary shoes. If a user pushes the button  58  in the A1 direction as shown in FIG. 17, the stopper  52  moves forwardly in the A2 direction. As such, if the stopper  52  moves forwardly, each of the fixing plates  54 ,  56  of the stopper  52  is removed from the second contact parts  82 ,  114  of the first links  74 ,  106  of the wheel assemblies  72 ,  104 . In the state that the first links  74 ,  106  are removed from the stopper  52 , and if each of the wheels  84 ,  96 ,  116 ,  128  is suppressed, each of the first links  74 ,  106  and the second links  90 ,  122  connected to the first links  74 ,  106  by the guides  102 ,  134  move in the A6 and A7 directions to go back to the original location. In this case, each of the second links  90 ,  122  is easily and exactly driven by the symmetrically and uniformly applied rotation force by the first wire  148  and the second wire  150  of the driving device  146 .  
     [0066] After that, if a user pushes button  58 , the stopper  52  moves back to the original location by the elastic spring  66 . If the stopper  52  moves back to the original location, each of the wheel assemblies  72 ,  104  is completely inserted into the receiving groove  16  so that the first contact parts  80 ,  112  of each of the first links  74 ,  106  are in contact with the fixing plates  54 ,  56  provided under the both side ends of the stopper  52 . The contact parts  94 ,  126  of the second links  90 ,  122  of each of the wheel assemblies  72 ,  104  are in contact with the fixing pieces  68 ,  70  protruded on both sides of the stopper  52  to maintain a stable fixing state with each link laid, so that the user can wear the shoe in this state. In case that the brake  152  is installed, it is better to use the shoe after the brake  152  is separated from the sole  14 .  
     [0067] A user can control the roller device to make the wheel protruded or withdrawn back to the original location when necessary, and he or she can skate or roller blade, or can use as ordinary shoes.  
     [0068] According to the shoes with a roller device of the present invention, the shoes can be used as ordinary shoes while walking, and used as stable in-line skates while skating so that the convenience and the amusement can be increased.  
     [0069] In addition, as the wheel of the wheel assembly can be protruded or withdrawn back to the original location stably and with balance, the functions of the shoe and the in-line skate can be quickly and easily exchanged each other to improve its commercial value.  
     [0070] It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention. Thus, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.