Abstract:
A quick board with a handle to operate the driving power of a front wheel is used for leisure, taste and amusement activities of teenagers, adults, children and others. In the quick board according to the present invention, the driving power to drive a front wheel is operated by only a handle of the quick board, thereby strengthening the muscular strength of the arms and waist of a user and minimizing the components of the quick board to avoid the complicated configuration in appearance. When a child who has a difficulty in pivoting a driving frame forward and backward operatively connected to a handle part to drive the front wheel uses a quick board, a front wheel cover part of a main body frame and the driving frame are selectively fixed so that such a user can enjoy the quick board in a stable and safe state.

Description:
CROSS REFERENCES 
       [0001]    This application claims foreign priority under Paris Convention and 35 U.S.C. § 119 to Korean Patent Application Nos. 10-2008-0081379 filed Aug. 20, 2008, and 10-2008-0090401 filed Sep. 12, 2008, each with the Korean Intellectual Property Office. 
       BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The present invention relates to a quick board and, more particularly, to a quick board in which a driving power of a front wheel to transfer a motive power to the quick board is operated by a handle, that is, the driving power to drive the front wheel of the quick board is operated by only the handle of the quick board, thereby strengthening the muscular strength of the arms and waist of a user. 
         [0004]    2. Discussion of Related Art 
         [0005]    A game device or a sports device called a quick board comprises: its opposite ends being each streamlined, its middle with a foothold where the feet of a user is received, and the front and rear wheels each having a small diameter positioned in the front and rear of the foothold slid on the ground, using the feet. 
         [0006]    Recently, it is well-known that a quick board has the form in which the length of a foothold is elongated, a front wheel is enclosed toward its front end, a connected and extended handle is installed, and a brake unit is included in the handle. 
         [0007]    This kind of a quick board is slid forward when a user pushes off the ground by using one foot while placing the other foot on the foothold. During the quick board moves forward, the quick board can travel within a given distance after the user placed both feet on the foothold. However, since a speed rapidly decreases, a traveling speed is not constant, and a driving power obtained by pushing the ground using the foot is weak, a traveling distance is considerably shortened and it is difficult to get a continuous speed. 
         [0008]    Moreover, since it is impossible to travel on the surface of an uphill road, a problem of carrying a quick board cannot be solved. 
         [0009]    To solve the aforementioned problems, various structures for a quick board have been suggested. For example, Korean Patent Application No. 2002-37275 and the like disclose a number of a bicycle combined with a quick board and the like. 
         [0010]    The technical contents of a number of the patents earlier filed or registered are mainly related to a quick board used by applying the saddle and pedal structures of a bicycle, in which a user sits down on the saddle and moves forward by using the pedals in the uphill road and the like. However, since the structure is complicated and is similar to that of a bicycle having small wheels, the size of the product becomes relatively bigger. 
         [0011]    To obtain a rotation ratio enabling an enjoyable speed in a wheel having a small diameter by using pedals, the structure cannot avoid forming the complex appearance of multi-level gears or increasing the diameter of a sprocket connected to a pedal and so on, and a chain may be separated away as in a bicycle during operation. 
         [0012]    Moreover, since a user operates a conventional bicycle combined with a quick board using only the feet while sitting down on the saddle, the effect of a whole body exercise decreases. 
         [0013]    To solve the aforementioned problems, Korean Patent Registration No. 642140 owned by the present applicant disclosed a “quick board capable of operating the rotation of front and rear wheels”. However, since the prior art needs an additional gear box to drive the rear wheel, pedals and the like, it has the complicated structure. 
         [0014]    Moreover, when moving forward the front wheel by pivoting the handle forward or backward, a beginner or specially, a child is likely to press the handle forward, thereby having a possibility to cause an accident. 
         [0015]    Therefore, a power transmission structure needs the powerful power transmission capable of driving the front wheel in a gentler manner, without a strong force. 
       SUMMARY OF THE INVENTION 
       [0016]    Therefore, the present invention is directed to provide a quick board which is simple and stable without any complicated structure and which is operated with more safety by overcoming the aforementioned problems of the prior art and improving the prior art. 
         [0017]    Another object of the present invention is to provide a quick board which is capable of performing powerful power transmission in a gentle manner without any strong action when the power is transmitted by the forward or backward pivot motion of a driving frame operated by a user. 
         [0018]    In accordance with an exemplary embodiment, the present invention provides a quick board with a handle to operate a driving power of a front wheel which includes a handle part  110 , a board  140 , and front and rear wheels  120  and  130 , comprising: a main body frame  150  supportedly connected to opposite sides of the rear wheel  130  by a second branch frame  153  divided in a front side of the rear wheel  130 ; a driving frame  170  including a ratchet gear part  160  having a one-way clutch bearing  161  coupled with gear-wheels  121   a  positioned at opposite ends of a spline shaft  121  of the front wheel  120 , and a planet gear part  180  in contact with a side of the ratchet gear part  160  to rotate the ratchet gear part  160  and the planet gear part  180 ; and a board  140 , and wherein the driving frame  170  spaced apart on opposite sides of the front wheel  120  is operatively connected to the handle part  110  and the outer circumferential surface of the ratchet gear part  160 . 
         [0019]    In accordance with another exemplary embodiment, the present invention provides a quick board with a handle to operate a driving power of a front wheel which includes front and rear wheels  120  and  130  positioned in front and rear of a main body frame  150 , a board  140  stably and fixedly received on a top surface of the main body frame  150 , and a handle part  110 , comprising: a main body frame  150  supportedly connected to opposite sides of the rear wheel  130  by a second branch frame  153  divided in a front side of the rear wheel  130 ; a driving frame  170  including a ratchet gear part  160  having a one-way clutch bearing  161  coupled with gear-wheels  121   a  positioned at opposite ends of a spline shaft  121  of the front wheel  120  and wherein the driving frame  170  spaced apart on opposite sides of the front wheel  120  is operatively connected to the handle part  110  and the outer circumferential surface of the ratchet gear part  160  to rotate the ratchet gear part  160 ; and each of gear-wheels  191  positioned at the left and right sides of a bracket  190  fixed to a side of a first branch frame  152  and connected to a guide chain  192 , a guide frame  174  extended downward at a lower end side of the driving frame  170 , a driving gear  200  coupled to the guide chain  192  by the gear-wheels, a first coaxial gear  210  which is connected to the driving gear  200  by a shaft (a first shaft S 1 ) and connected to a first driven gear  220  by a chain  250 , and a second coaxial gear  230  which is connected to a second driven gear  240  by a chain  250 ′ and connected to the first driven gear  220  by another shaft (a second shaft S 2 ) so as to be rotated in the guide frame  174 , wherein the second driven gear  240  is operatively connected to the spline shaft  121  so that when the handle part  110  is pivoted, the rotation power of the driving gear  200  rotates the second driven gear  240 , to drive the front wheel  120  through the spline shaft  121 . 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0020]    The above and other features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail preferred embodiments thereof with reference to the attached drawings in which: 
           [0021]      FIG. 1  is a perspective view illustrating a quick board according to a first exemplary embodiment of the present invention; 
           [0022]      FIG. 2  is a separate perspective view illustrating the quick board of  FIG. 1 ; 
           [0023]      FIG. 3  is a separate view illustrating a ratchet gear part applied to a front wheel of the quick board of  FIG. 1 ; 
           [0024]      FIG. 4  is a side view illustrating the quick board of  FIG. 1 , in which a driving frame operatively connected to a handle part is pivoted in the same direction by pivoting the handle part, to provide a forward driving power to the front wheel; 
           [0025]      FIG. 5  is a partial enlarged rear view illustrating the front wheel of the quick board of  FIG. 1 ; 
           [0026]      FIG. 6  is a separate enlarged perspective view of part “A” in  FIG. 4 , illustrating a driving frame fixing part to selectively connect and fix a driving frame and a main body frame of the quick board of  FIG. 1 ; 
           [0027]      FIG. 7  is a partial enlarged perspective view of part “B” in  FIG. 5 , illustrating that the driving frame and the main body frame are fixed by the driving frame fixing part of  FIG. 6  at a user&#39;s selection; 
           [0028]      FIG. 8  is a perspective view of a quick board according to a second exemplary embodiment of the present invention; 
           [0029]      FIG. 9  is a separate perspective view illustrating the quick board of  FIG. 8 ; 
           [0030]      FIG. 10  is a separate view illustrating a ratchet gear part applied to a front wheel of the quick board of  FIG. 8 ; 
           [0031]      FIG. 11  is a side view illustrating the quick board of  FIG. 8 , in which a driving frame operatively connected to a handle part is pivoted in the same direction by pivoting the handle part, to provide a forward driving power to the front wheel; 
           [0032]      FIG. 12  is a separate perspective view illustrating a power transmission unit to obtain the forward driving power of the quick board of  FIG. 8 ; and 
           [0033]      FIG. 13  is a separate perspective view illustrating another power transmission unit according to a modified example, to obtain a forward driving power of the quick board of  FIG. 8 . 
       
    
    
       [0034]    [Brief description of main reference numbers in drawings] 
         [0000]    
       
         
               
               
               
             
           
               
                   
                   
               
             
             
               
                   
                 100: quick board 
                 110: handle part 
               
               
                   
                 120: front wheel 
                 121: spline shaft 
               
               
                   
                 121a: gear-wheel 
                 130: rear wheel 
               
               
                   
                 140: board 
                 150: main body frame 
               
               
                   
                 151: front wheel cover part 
                 152: first branch frame 
               
               
                   
                 153: second branch frame 
                 154: cylindrical member 
               
               
                   
                 154a: coupling element 
                 155: bearing 
               
               
                   
                 156: cover body 
                 157: fixing element 
               
               
                   
                 157a: protruding element 
                 158: driving frame fixing part 
               
               
                   
                 160: ratchet gear part 
                 161: one-way clutch bearing 
               
               
                   
                 162: connection flange 
                 163: cover 
               
               
                   
                 170: driving frame 
                 171: center frame body 
               
               
                   
                 172: upper connection bar 
                 172a: coupling opening 
               
               
                   
                 173: up/down lift frame 
                 174: guide frame 
               
               
                   
                 175: lower connection bar 
                 175a: coupling openings 
               
               
                   
                 176: position fixing element 
                 177: side cover body 
               
               
                   
                 190: bracket 
                 191: gear-wheel 
               
               
                   
                 192: guide chain 
                 200: driving gear 
               
               
                   
                 210: first coaxial gear 
                 220: first driven gear 
               
               
                   
                 230: second coaxial gear 
                 240: second driven gear 
               
               
                   
                 250, 250: chain 
                 S1: first shaft 
               
               
                   
                 S2: second shaft 
                 B: bearing 
               
               
                   
                   
               
             
          
         
       
     
       DETAILED DESCRIPTION OF THE INVENTION 
       [0035]    The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. This invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these exemplary embodiments are provided as teaching examples of the invention. Like numbers refer to like element. 
         [0036]    The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments of the invention. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. The best modes of the present invention will be described with reference to first and second exemplary embodiments. 
         [0037]    In accordance with a first exemplary embodiment of the present invention, a quick board  100  with a handle to operate a driving power of a front wheel which includes a handle part  110 , a board  140  and front and rear wheels  120  and  130 , comprises: 
         [0038]    a main body frame  150  supportedly connected to opposite sides of the front wheel  120  by a first branch frame  152  divided from an upper end of a front wheel cover part  151  in a rod shape which covers from rear to top of the front wheel  120 , horizontally extended straight from a lower end of the front wheel cover part  151 , and the main body frame  150  supportedly connected to opposite sides of the rear wheel  130  by a second branch frame  153  divided from a front of the rear wheel  130 ; 
         [0039]    a driving frame  170  including a ratchet gear part  160  and a planet gear part  180  in either one side of the front wheel  120  to forward drive the front wheel  120  in one direction, wherein the ratchet gear part  160  includes a one-way clutch bearing  161  connected to gear-wheels  121   a  at opposite ends of a spline shaft  121  of the front wheel  120  and the planet gear part  180  is provided to contact with a side of the ratchet gear part  160 , and the driving frame  170  spaced apart on opposite sides of the front wheel  120  and operatively connected to the handle part  110  and the outer circumferential surface of the ratchet gear part  160  to rotate the ratchet gear part  160  and the planet gear part  180 ; and 
         [0040]    a board  140  stably received and connected to a top side of the main body frame  150 . 
         [0041]    In accordance with a second exemplary embodiment of the present invention, a quick board  100  with a handle to operate a driving power of a front wheel, which includes front and rear wheels  120  and  130  each positioned in front and rear of a main body frame  150 , a board  140  stably received and fixed onto a top of the main body frame  150  and a handle part  110 , comprises: 
         [0042]    a main body frame  150  supportedly connected to opposite sides of the front wheel  120  by a first branch frame  152  divided from an upper end of a front wheel cover part  151  in a rod shape which covers from rear to top of the front wheel  120 , horizontally extended straight from a lower end of the front wheel cover part  151 , and the main body frame  150  supportedly connected to opposite sides of the rear wheel  130  by a second branch frame  153  divided from a front side of the rear wheel  130 ; 
         [0043]    a driving frame  170  including a ratchet gear part  160  in either one side of the front wheel  120  to forward drive the front wheel  120  in one direction, wherein the ratchet gear part  160  includes the one-way clutch bearing  161  connected to gear-wheels  121   a  at opposite ends of a spline shaft  121  of the front wheel  120 , and the driving frame  170  spaced apart on the opposite sides of the front wheel  120  to rotate the ratchet gear part  160  and operatively connected to the handle part  110  and the outer circumferential surface of the ratchet gear part  160  to rotate the ratchet gear part  160 ; and 
         [0044]    a bracket  190  fixed on a side surface of the first branch frame  152 , gear-wheels  191  each positioned at left and right sides of the bracket  190 , a guide chain  192  connecting the gear-wheels  191 , a guide frame  174  extended downward at a lower end side of the driving frame  170 , a driving gear  200  coupled to the guide chain  192  by the gear-wheels, a first coaxial gear  210  which is connected to the driving gear  200  by a shaft (a first shaft S 1 ) and connected to a first driven gear  220  by a chain  250 , and a second coaxial gear  230  which is connected to a second driven gear  240  by a chain  250 ′ and connected to the first driven gear  220  by another shaft (a second shaft S 2 ) so as to be rotated in the guide frame  174 , wherein the second driven gear  240  is operatively connected to the spline shaft  121  so that when the handle part  110  is pivoted, the rotation power of the driving gear  200  rotates the second driven gear  240 , to drive the front wheel  120  through the spline shaft  121 . 
         [0045]    The present invention has the structure to transmit the driving power to the front wheel of the quick board by using the handle part. The present invention may be carried out by pivoting the handle forward and backward operatively in connection with the front wheel in a structure of using the planet gear part connected to the front wheel and another structure of using the chain unit without any planet gear part. 
         [0046]    The structure of the quick board in which the front wheel is driven by the planet gear part according to the first exemplary embodiment of the present invention and the structure of the quick board in which the front wheel is driven by the chain unit according to the second exemplary embodiment of the present invention will be described in detail below. 
       FIRST EXEMPLARY EMBODIMENT 
       [0047]    In accordance with the first embodiment of the present invention, as illustrated in the attached drawings, front and rear wheels  120  and  130  are connected to each other by a main body frame  150 , and a driving frame  170  connected to a handle part  110  is connected to opposite sides of the front wheel  120 . A ratchet gear part  160  and a planet gear part  180  are connected to either one side of the front wheel  120 , wherein the ratchet gear part  160  is to drive the front wheel  120  forward and the planet gear part  180  is in contact with the side of the ratchet gear part  160 . When a user pivots the handle part  110  forward or backward, the driving frame  170  operatively connected to the handle part  110  rotates the ratchet gear part  160  and the planet gear part  180  so that the quick board  100  is moved forward as the front wheel  120  is driven forward. 
         [0048]    The present invention in the aforementioned structure comprises: the main body frame  150 , the front wheel  120  and rear wheel  130  respectively connected to front and rear parts of the main body frame  150  so as to be driven, the board  140  stably received and fixed to the main body frame  150 , the driving frame  170  to drive the front wheel  120 , and the handle part  110  to pivot the driving frame  170  forward or backward. 
         [0049]    As illustrated in  FIG. 2 , the main body frame  150  comprises: a front wheel cover part  151  formed upward from a rear side of the front wheel  120  in a uniform curvature, a first branch frame  152  connected from a front end of the front wheel cover part  151  to each of the opposite sides of the front wheel  120 , and a second branch frame  153  connected to the rear wheel  130  horizontally extended from a rear side of the first branch frame  152 . 
         [0050]    The first branch frame  152  is configured irrelevantly to the driving of the front wheel  120 . The first branch frame  152  has a disk-type plate  152   a  at its end opposite surfaces. The ratchet gear part  160  and the planet gear part  180  contacting with the ratchet gear part  160  operatively rotated of the present invention are positioned at either inner side of the disk-type plate  152   a . A stopper  152   b  is positioned at either outer side of the disk-type plate  152   a , preferably to prevent the driving frame  170  from being excessively pivoted toward a front side of the front wheel  120 . 
         [0051]    The second branch frame  153  horizontally extended from a rear side of the first branch frame  152  is formed to support and connect the rear wheel  130  at a rear side of the main body frame  150 . 
         [0052]    Accordingly, the front wheel  120  and the rear wheel  130  are supported and fixedly connected to each other by the first and second branch frames  152  and  153  extended to the front and rear sides from the main body frame  150 . 
         [0053]    As illustrated, to provide the quick board  100  according to the present invention, the diameter of the front wheel  120  is to be relatively greater than that of the rear wheel  130 . 
         [0054]    The reason why the diameter of the front wheel  120  needs to be greater than that of the rear wheel  130  is to properly obtain the forward movement power of the quick board  100  when the handle part  110  is pivoted forward or backward. 
         [0055]    As illustrated in  FIG. 7 , when it needs to control the forward or backward pivot motions of the driving frame  170  to be described later, for example, when a child, an unskilled person or the like uses the quick board  100  according to the present invention and pivots the handle part  100  and the driving frame  170  forward or backward, such a user is likely to lose balance and to fall forward, causing an accident. 
         [0056]    In order for a child, an unskilled person or the like to stably and safely use the quick board  100 , it is preferably to use the driving frame  170  fixed to the main body frame  150 . 
         [0057]    To this end, a bearing  155  is inserted into the inner circumferential surface side at a top part of a cylindrical member  154 . The cylindrical member  154  is positioned at a contact point where an upper end of the front wheel cover part  151  of the main body frame  150  contacts with the first branch frame  152  extended downward from the upper end of the front wheel cover part  151  (shown in  FIG. 6 ). A coupling element  154   a  is formed to protrude from the bearing  155  inserted inner circumferential surface integrally with the cylindrical member  154 . The coupling element  154   a  is formed in a screw shape on the outer circumferential surface. A cover body  156  is hollow to be screw-coupled with the coupling element  154   a . The cover body  156  has the inner circumferential surface forming a female screw. A fixing element  157  is formed to be screw-coupled to the female screw formed on the inner circumferential surface of the cover body  156  and to be changeable in position. 
         [0058]    A protruding element  157   a  is formed to protrude from the top of the fixing element  157 . The protruding element  157   a  is coupled to a protruding element coupling opening  175   b  formed to pass through a center of a lower connection bar  175  of the driving frame  170  to be described later. When the fixing element  157  is turned to protrude, the protruding element  157   a  of the fixing element  157  is inserted into the protruding element coupling opening  175   b  of the lower connection bar  175 , to maintain a fixing state between the driving frame  170  and the main body frame  150  so that a user is unable to pivot the driving frame  170  forward or backward, thereby preventing an accident when a child, an unskilled person or the like uses the quick board  100  according to the present invention. 
         [0059]    The board  140  is provided as a unit for a user to ride on the quick board  100 . The board  140  is fixed in the middle part of the main body frame  150 , that is, on the top of the body horizontally extending from the rear of the front wheel cover part  151 . 
         [0060]    A unit for fixing the board  140  may use a well-known connection unit, such as a bolt or the like. No description of the detailed coupling structure will be presented. 
         [0061]    As illustrated in the drawings, the driving frame  170  is to drive the front wheel  120  in one direction, that is, to move the quick board  100  forward. The front wheel  120  operatively connected to the driving frame  170  is driven depending on a pivot angle of the driving frame  170 . 
         [0062]    To this end, the ratchet gear part  160  to be operatively connected to the driving frame  170  contacts with the as described above disk-type plate  152   a  of the front wheel cover part  151  and is operatively connected to the spline shaft  121  of the front wheel  120 . 
         [0063]    That is, to rotate the ratchet gear part  160  coupled to the gear-wheels  121   a  positioned at opposite ends of the spline shaft  121  of the front wheel  130  in either one side so that the front wheel  120  is moved forward in one direction, the driving frame  170  is spaced apart at the opposite sides of the front wheel  120  and is operatively connected to the handle part  110  and the outer circumferential surface of the ratchet gear part  160 . 
         [0064]    Accordingly, when a user pivots the driving frame  170  forward and backward to pivot the front wheel  130  in a desired direction, the ratchet gear part  160  connected to the guide frame  174  positioned at a lower side of the driving frame  170  is pivoted. Then, since the center of the ratchet gear part  160  is coupled by the gear-wheels  121   a  at the opposite ends of the spline shaft  121  of the front wheel  120 , the one-way clutch bearing  161  of the ratchet gear part  160  is pivoted according to the pivot of the driving frame  170 , to rotate the front wheel  120  operatively connected to the driving frame  170  so as to be driven forward. 
         [0065]    The ratchet gear part  160  is to transmit the rotation power by being coupled to the gear-wheel in one direction. Generally, the ratchet gear part  160  may apply the one-way clutch bearing as well-known. 
         [0066]    As illustrated in  FIG. 3 , the planet gear part  180  is positioned at a side of the ratchet gear part  160 . The planet gear part  180  uses a planet gear part which is one of the components of the invention disclosed in Korean Patent Registration No. 642140 of the present applicant. 
         [0067]    The planet gear part  180  includes three spur gears  182  operatively connected to the gear-wheels  121   a  of the spline shaft  121 , and a planet carrier  181  connected to an outer circumferential surface of each spur gear  182  by a gear-wheel. The planet gear part  180  is provided to be operatively connected to a disk plate  174   a , which is integrally connected to either one side end of the guide frame  174  so that the planet gear part  180  is rotated in the same direction by the pivot of the guide frame  174  operated by the pivot of the handle part  110 . The spline shaft  121  connected to the spur gears  182  of the planet gear part  180  by the gear-wheels is rotated in a reverse direction to the direction in which the planet gear part  180  is rotated, so that the forward driving power of rotating the front wheel  120  is obtained from an opposite moving direction of the handle part  110 . 
         [0068]    On the contrary, when the handle part  110  is pivoted in (the other) outward direction, the planet gear part  180  is also rotated in the same direction (as the handle part  110 ) by the above-described acting relations. Since the planet gear part  180  rotating direction is same as the front wheel  120  driving (forward) direction, the ratchet gear part  160  operatively connected to the planet gear part  180  runs idle by the one-way clutch bearing  161  so that the power is not transmitted to the reverse driving direction of the front wheel  120  and only a handle, that is, the handle part  110  and the driving frame  170  change their positions forward from the front wheel  120 . 
         [0069]    When a user repeatedly pulls the handle part toward the user&#39;s body, the front wheel  120  obtains the forward driving power by the above-described acting relations and repeats a series of process of moving the quick board  100  forward. 
         [0070]    In a modified exemplary embodiment of the present invention, when the direction of the one-way clutch bearing  161  in the ratchet gear part  160  is changed, the forward driving power of the front wheel  120  is obtained by pushing the handle part  110  forward. Since such a selection is merely the application of the present invention to be sufficiently predicted, it is obviously within the scope of the present invention. 
         [0071]    A structure of the driving frame  170  to have the aforementioned acting relations will be described. The handle part  110  is positioned at a top part of the driving frame  170 . An upper connection bar  172  includes a center frame body  171  facing the middle of the handle part  110  fixed on a top surface of the upper connection bar  172 , and coupling openings  172   a  formed at opposite ends of the upper connection bar  172 . An up/down lift frame  173  is formed to be connected to the coupling openings  172   a.    
         [0072]    The guide frame  174  receives or extends the up/down lift frame  173  through guiding the up/down lift frame  173  to be adjusted in length. The guide frames  174  are spaced apart from each other on at opposite side surfaces of the front wheel  120 . A lower connection bar  174  is positioned at an upper part of the guide frame  174  and includes coupling openings  175   a  respectively bored at its opposite side ends, to maintain the guide frames  174  to be spaced apart from each other. 
         [0073]    As described above, the upper part of the guide frame  174  is inserted into the coupling openings  175   a . The up/down lift frame  173  is inserted to be fixed inside the guide frame  174  insert-protruded from the coupling openings  175   a.    
         [0074]    To fix the position of the up/down lift frame  173  after it is drawn and received, preferably, a position fixing element  176  may be formed on the upper outer circumferential surface of the guide frame  174 . 
         [0075]    The position fixing element  176  may be carried out by using a generally used structure. 
         [0076]    Close to a lower end of the guide frame  174  is formed of the disk-type plates  152   a  positioned at the ends of the first branch frame  152  of the main body frame  150  and the ratchet gear part  160  positioned at either side of the disk-type plate  152   a  or the like is covered by using a side cover body  177 . 
         [0077]    As illustrated in  FIG. 3 , the ratchet gear part  160  includes a connection flange  162  to be connected to one side of the front wheel  120 , the one-way clutch bearing  161  positioned outside the connection flange  162 , and a cover  163  for covering the one-way clutch bearing  161 . The outer circumferential surface of the cover  163  is operatively connected to the end of the guide frame  174  of the driving frame  170 . Accordingly, when a user pivots the driving frame  170  forward using the handle part  110 , the spline shaft  121  is run idle without pivot by the one-way clutch bearing  161 . When a user pulls the handle part  110 , the rotation power is transmitted to the spline shaft  121  at the same rotation ratio by the gear-wheel connection of the one-way clutch bearing  161  and the spline shaft  121  and obtains the forward transfer power so that the front wheel  120  is driven in the forward direction in which the quick board  100  advances. 
         [0078]    Therefore, a user provides the forward power to the quick board  110  by repeating the above-described actions and enjoys the quick board  100 . 
         [0079]    As described above, since it may cause an accident and may not obtain the optimal pivot power when the driving frame  170  is excessively pivoted in the direction to the front wheel  120 , a stopper  152   b  controls the pivot angle of the driving frame  170 . 
         [0080]    Further, when a user is a child, an unskilled person or the like, it may be difficult to pivot the driving frame  170  forward or backward while riding on the quick board  100 . In this case, if the protruding element  157   a  of a driving frame fixing part  158  positioned in the front end of the main body frame  150 , that is, at the upper end of the front wheel cover part  151 , is inserted into a protruding element coupling opening  175   b  in the middle of the lower connection bar  175  provided to maintain the guide frames  174  to be spaced apart from each other. Then, no forward transfer power is obtained through pivoting the handle part  110  and the driving frame  170  forward or backward. Therefore, like a general quick board, a user obtains the forward transfer power by sliding on the ground by the user&#39;s foot, to safely enjoy the quick board  100 . 
       SECOND EXEMPLARY EMBODIMENT 
       [0081]    The quick board according to the first exemplary embodiment obtains the forward driving power of the front wheel by the planet gear part when the handle part is pivoted. A quick board  100  according to the second exemplary embodiment of the present invention has the same structure of the quick board according to the first exemplary embodiment, except that a chain unit is used to obtain the driving power of the front wheel, without the planet gear part. 
         [0082]    As illustrated in  FIGS. 8 through 13 , in the quick board  100  according to the second exemplary embodiment, front and rear wheels  120  and  130  are connected by a main body frame  150 , a driving frame  170  connected to a handle part  110  is connected to the opposite sides of the front wheel  120 , and a ratchet gear part  160  is connected to either one side of the front wheel  120  so as to be pivotable to drive the front wheel  120  in the forward direction. When a user pivots the handle part  110  forward or backward, the driving frame  170  operatively connected to the handle part  110  rotates the ratchet gear part  160 , so that the quick board  100  is moved forward as the front wheel  120  is driven forward. 
         [0083]    As described above, the basic structure of a quick board  100  according to the second exemplary embodiment is same as that of the quick board  100  of the first exemplary embodiment. The quick board  100  according to the second exemplary embodiment comprises: a main body frame  150 , a front wheel  120  and a rear wheel  130 , a board  140  stably received and fixed on to the main body frame  150 , a driving frame  170  for driving the front wheel  120 , and a handle part  110  for controlling the driving frame  170  to be pivoted forward or backward. 
         [0084]    As illustrated in  FIG. 9 , the structure of the main body frame  150  is same as that described with reference to the first exemplary embodiment. 
         [0085]    A first branch frame  152  is configured, irrelevantly to the driving of the front wheel  120 . To transmit the driving power to a spline shaft  121  of the front wheel  120 , a pivot power by the handle part  110  controlled by a user enables to drive the quick board  100  forward, like the first exemplary embodiment. 
         [0086]    The structure of the driving frame  170  is also same as that of the first exemplary embodiment. Specifically, in the second exemplary embodiment of the present invention, when a user pivots the driving frame  170  forward or backward by using the handle part  110  to provide the driving power to the front wheel  120 , the pivot power drives the front wheel  120  through a power transmission unit formed by the gear-wheel coupled to gears, as illustrated in the attached drawings. 
         [0087]    To this end, a bracket  190  in a flat shape is horizontally fixed to the either outer surface side of the first branch frame  152 . Gear-wheels  191  are each positioned at opposite side ends of the bracket  190 . A guide chain  192  is provided to connect the gear-wheels  191  formed at the opposite side ends of the bracket  190 . 
         [0088]    Each gear-wheel  191  is fixed by a shaft so as not to be rotated. The guide chain  192  forms a caterpillar trace and is not rotated, thereby maintaining a fixed situation. 
         [0089]    As illustrated in the drawings, a driving gear  200  connected to the guide chain  192  by the gear-wheels is provided to a guide frame  174  which is a component of the driving frame  170 . 
         [0090]    In  FIG. 11 , reference mark “S 1 ” is called a first shaft. 
         [0091]    As illustrated in  FIG. 11  and  FIG. 12 , the driving gear  200  mounted on the first shaft S 1  is connected to the guide chain  192  by the gear-wheels. As a user pivots the handle part  110  forward or backward, the driving gear  200  operatively connected to the first shaft S 1  is pivoted, along the guide chain  192 . 
         [0092]    Further, a first coaxial gear  210  having the same rotation ratio as that of the driving gear  200  is provided on the first shaft S 1  where the driving gear  200  is provided. 
         [0093]    The first coaxial gear  210  and the driving gear  200  have the same rotation ratio, and it is preferable to form the diameter of the first coaxial gear  210  same as that of the driving gear  200 . 
         [0094]    Further, as illustrated in  FIG. 11  and  FIG. 12 , to transfer the driving power of the first coaxial gear  210 , a first driven gear  220  connected by a chain  250  is positioned to be rotated directly downward from the first coaxial gear  210 , that is, about a second shaft S 2  at a lower end of the guide frame  174 . 
         [0095]    Then, the diameter of the first driven gear  220  is to be greater than that of the first coaxial gear  210 , to transfer the maximum driving power to the front wheel  120 . 
         [0096]    Further, a second coaxial gear  230  having the same diameter as the first driven gear  220  is mounted on the second shaft S 2  where the first driven gear  220  is mounted, and a second driven gear  240  mounted on the spline shaft  121  is connected to the second coaxial gear  230  by a chain  250 . 
         [0097]    The end of the spline shaft  121  is connected to a bearing B provided in the guide frame  174 , to connect the driving frame  170  to the spline shaft  121  so as to be supported. 
         [0098]    Accordingly, to drive the front wheel  120  in the second exemplary embodiment of the present invention, a user pivots the handle part  110  forward or backward to obtain the forward driving power. When the handle part  110  is pivoted forward or backward, the driving frame  170  is pivoted in the same direction. Then, the driving gear  200  provided at the lower end part of the driving frame  170  is pivoted, along the guide chain  192  connected to the gear-wheels  191  of the bracket  190  fixedly positioned at the side of the first branch frame  152 . 
         [0099]    When the rotation power is transmitted to the first shaft S 1  by the driving gear  200  pivoting along the guide chain  192 , the first coaxial gear  210  mounted on the first shaft S 1  is rotated with the same rotation ratio, thereby rotating the first driven gear  220  connected directly downward to the first coaxial gear  210  by the chain  250  or the like. 
         [0100]    The diameter of the first driven gear  220  is greater than that of the first coaxial gear  210 . 
         [0101]    Further, the second coaxial gear  230  mounted on the same second shaft S 2  on which the first driven gear  220  is mounted has the same diameter as the first driven gear  220  and is rotated with the same rotation ratio, thereby rotating the second driven gear  240  mounted on the spline shaft  121  directly downward to the second coaxial gear  230 . Then, the rotation power rotates the spline shaft  121 , enabling the driving of the front wheel  120 . 
         [0102]    The driving power is transferred to the front wheel  120  by the pivot of the handle part  110 . Then, only when the handle part  110  is pivoted in any one direction as selected, i.e., in the front or rear, the driving power is to be transferred to the front wheel  120 . 
         [0103]    To this end, in the present invention, a one-way clutch bearing  161  of the ratchet gear part  160  has the aforementioned function, and the acting relations thereof are same as those described with reference to the first exemplary embodiment. 
         [0104]    As illustrated in  FIG. 13 , the same driving power can be transferred by using the second shaft S 2  only, without the first shaft S 1 . For example, the bracket  190  is fixedly positioned toward a far lower end of the first branch frame  152  and the driving gear  200  having a small diameter is positioned on the second shaft S 2 . The driving gear  200  is connected to the guide chain  192  connected to the gear-wheels  191  of the bracket  190 , using the gear-wheels. The first driven gear  220  having a big diameter is mounted on the same shaft on which the driving gear  200  is positioned. The second driven gear  240  having a small diameter, which is connected to the first driven gear  220  by the chain  250 , is mounted on the spline shaft  121 . When a user pivots the handle part  110 , the pivot power drives the front wheel  120  through the gear-wheel motion of each gear. 
         [0105]    In the second exemplary embodiment of the present invention, the power transmission unit is illustrated and described by using the gears, chains and the like. However, the present invention does not limit the power transmission unit to the gears, chains and the like. 
         [0106]    For example, the gear-wheels  191  of the bracket  190  may be replaced by guide rollers. In this case, the first and second coaxial rollers and the first and second driven rollers replaced by the guide rollers may be secured by a belt or the like. A driving roller in contact with the belt, a first coaxial roller connected to the driving roller by a first shaft, a first driven roller connected to the first coaxial roller by a belt, a second coaxial roller mounted to the first driven roller by a second shaft, and a second driven roller connected to the second coaxial roller by a belt or the like and mounted on the spline shaft  121 , thereby obtaining the same driving power. It is obvious that these alternative arrangements are within the scope of the present invention. 
         [0107]    In the quick board  100  according to the second exemplary embodiment of the present invention, when the driving frame  170  is pivoted by using the handle part  110 , the driving power for the direction in which the quick board  100  advances is transmitted to the front wheel  120  operatively connected to the driving frame  170 . The structure of transmitting the driving power to drive the front wheel  120  forward will be described below: 
         [0108]    That is, to rotate the ratchet gear part  160  coupled to the gear-wheels  121   a  positioned at the opposite ends of the spline shaft  121  on either one side surface of the front wheel  130  so that the front wheel  120  is moved forward in one direction, the driving frame  170  spaced apart at the opposite sides of the front wheel  120  is operatively connected to the handle part  110  and the outer circumferential surface of the ratchet gear part  160 . 
         [0109]    Accordingly, when a user pivots the driving frame  170  forward or backward to pivot the front wheel  130  in a desired direction, the ratchet gear part  160  connected to the guide frame  174  positioned at a lower part of the driving frame  170  is pivoted. Then, since at the center of the front wheel  120 , the ratchet gear part  160  is coupled to the gear-wheels  121   a  at the opposite ends of the spline shaft  121 , the one-way clutch bearing  161  of the ratchet gear part  160  is pivoted according to the pivot of the driving frame  170  and rotates the front wheel  120  forward which is operatively connected to the driving frame  170 . 
         [0110]    The ratchet gear part  160  for transmitting the rotation power by being coupled to the gear-wheel in one direction uses the one-way clutch bearing as described with reference to the first exemplary embodiment and illustrated with reference to the relevant drawings. 
         [0111]    That is, in the second exemplary embodiment like the first exemplary embodiment, when the direction of the one-way clutch bearing  161  in the ratchet gear part  160  is changed, the forward driving power of the front wheel  120  is obtained by pushing the handle part  110  forward. 
         [0112]    In the quick board with the handle to operate the driving power of the front wheel according to the present invention, only the front wheel is driven and the effect of the whole body exercise is increased while removing the complicated configuration in appearance by minimizing the components of the quick board. 
         [0113]    Furthermore, when the quick board according to the present invention is used by a child who has difficulties in pivoting forward or backward the driving frame operatively connected to the handle part to drive the front wheel or the like, the front wheel cover part of the main body frame and the driving frame are structured to be fixed so that the child or the like can enjoy the quick board in a stable state. 
         [0114]    Furthermore, unlike a quick board which is operated by a user&#39;s foot sliding on the ground, the front wheel of the quick board according to the present invention is operated by pivoting the driving frame operatively connected to the handle part. Therefore, the present invention is expected to have the effects of improving the exercise of the upper part of the body as well as the exercise for the muscular strength of a user. 
         [0115]    The invention has been described using preferred exemplary embodiments. However, it is to be understood that the scope of the invention is not limited to the disclosed embodiments. On the contrary, the scope of the invention is intended to include various modifications and alternative arrangements within the capabilities of persons skilled in the art using presently known or future technologies and equivalents. The scope of the claims, therefore, should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.