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Title:
STANDUP TYPE SMALL BICYCLE FOR EXERCISE
Document Type and Number:
WIPO Patent Application WO/2008/056869
Kind Code:
A1
Abstract:
A standup type small bicycle for exercise is disclosed, which comprises a plate pedal which is formed in a plate shape, one side of the plate pedal being connected with a driving shaft pedal arm engaged at both sides of the driving shaft with a pedal shaft, the other side of the plate pedal being connected with a driven shaft pedal arm engaged at a hub unit of the rear wheel with a pedal shaft. In the above bicycle, a saddle is removed from a conventional bicycle, and a plate pedal is longitudinally formed so that a pedal connected with a driving sprocket wheel is extended to a hub shaft of a rear wheel as if a user steps on a plate pedal with whole bodies in a posture of riding a kick board for thereby maximizing an exercise effect, and kids can easily use the bicycle.

Inventors:
KIM, Han-soo (2 Hanam Jugong A.P.T, Woosan-dong Gwangsan-gu, Gwangju-si 506-752, 05-1007, KR)
Application Number:
KR2007/003698
Publication Date:
May 15, 2008
Filing Date:
August 01, 2007
Export Citation:
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Assignee:
MIN, Kyoung-Mi (2 Hanam Jugong A.P.T, Woosan-dong Gwangsan-gu, Gwangju-si,Republic of Korea, Gwangju 506-752, 05-1007, KR)
KIM, Han-soo (2 Hanam Jugong A.P.T, Woosan-dong Gwangsan-gu, Gwangju-si 506-752, 05-1007, KR)
International Classes:
B62M1/24
Foreign References:
KR20050029660A
KR20040096270A
KR20050053564A
JPS63108887U
Download PDF:
Claims:

Claims

[1] In a bicycle which includes a front wheel and a rear wheel engaged at a front side and a rear side, respectively, a handle post connected at a shaft of the front wheel, a handle fixed at an upper side of the handle post, a support frame which is horizontally connected between the handle post and the rear wheel, a driving shaft which is rotatable at a center of the support frame, and a chain which connects a driving sprocket wheel engaged at one side of the driving shaft and a driven sprocket wheel fixed at a hub unit engaged at the rear wheel, a standup type small bicycle for exercise, comprising: a plate pedal 50 which is formed in a plate shape, one side of the plate pedal being connected with a driving shaft pedal arm 52 engaged at both sides of the driving shaft 36 with a pedal shaft 53, the other side of the plate pedal being connected with a driven shaft pedal arm 54 engaged at a hub unit of the rear wheel 22 with a pedal shaft 55.

[2] The bicycle of claim 1, wherein said hub unit comprises: a hub body 71 which is connected with the rear wheel 22; a hub shaft 70 which passes through the hub body 71 and freely rotates; a plurality of steel bearings 72 which decrease a frictional force so that the hub shaft 70 can freely rotate with respect to the hub body 71 ; a conical nut 73 which is thread-engaged at the hub shaft 70 for preventing an escape of the steel bearings 72; a shaft rotation bearing 76 which fixes a frame fixing bar 75 formed in a ring shape at an end of the support frame 20 and allows the hub shaft 70 to freely rotate; and a tapered pin 51 which fixes the driven shaft pedal arm 54 to the hub shaft 70.

[3] The bicycle of claim 2, wherein said shaft rotation bearing 76 is mounted at an inner side of the frame fixing bar 75, and an outer circumference of the mounted shaft rotation bearing 76 is fixed by the frame fixing bar 75 by the frame fixing bolt 78, said bicycle further comprising a first fixing nut 74 which is thread- engaged at the hub shaft 70 for preventing a loosening of the conical nut 74, and a second fixing nut 77 for fixing the shaft rotation bearing 76 to the hub shaft 70.

[4] The bicycle of claim 1, wherein said hub unit comprises: a hub body 71 which is connected with the rear wheel 22; a through hub shaft 82 which is inserted into the hub body 71 ; a plurality of steel bearings 72 which decrease a frictional force so that the hub body 71 can freely rotate with respect to the through hub shaft 82 hub body 71 ; a conical nut 73 which is thread-engaged at the through hub shaft 82 for

preventing an escape of the steel bearings 72; a fixing nut 74 which fixes the conical nut 73; a fixing nut 83 which fixes a ring shaped frame fixing bar 87 formed at an end of the support frame 20; an insertion shaft bearing 84 having one side in which a plurality of steel bearings 88 are mounted for thereby forming a bearing part and the other side in which a female thread is formed for an engagement with the through hug shaft

82; a hub insertion shaft 80 which passes through the insertion shaft bearing 84 and the through hub shaft 82; a conical nut 85 which prevents an escape of the steel bearings 88 toward the outside and allows the hub insertion shaft 80 to independently rotate with respect to the through hub shaft 82; a fixing nut 86 which fixes the conical nut 85 to the hub insertion shaft 80; and a tapered pin 51 which fixes the driven shaft pedal arm 54 to an end of the hub insertion shaft 80.

[5] The bicycle of claim 1, further comprising a sync sprocket 90 which is engaged at the driving shaft 36, a rear wheel sync sprocket 91 which is engaged at the hub unit of the rear wheel 22, and a chain which connects the sync sprocket 90 and the rear wheel sync sprocket 91.

[6] The bicycle of one among claims 1 through 5, wherein said front wheels are formed of two wheels.

[7] In a bicycle which includes a front wheel and a rear wheel engaged at a front side and a rear side, respectively, a handle post connected at a shaft of the front wheel, a handle fixed at an upper side of the handle post, a support frame which is horizontally connected between the handle post and the rear wheel, a driving shaft which is rotatable at a center of the support frame, and a chain which connects a driving sprocket wheel engaged at one side of the driving shaft and a driven sprocket wheel fixed at a hub unit of the rear wheel, a standup type small bicycle for exercise, comprising: rope fixtures 62 and 64 which are connected with an upper side in the support frame 20 of the rear wheel 22, each end of the rope fixtures being outwardly bent and forming a rope groove 65; and a plate pedal 50 which is formed in a plate shape, one side of the plate pedal being connected with a driving shaft pedal arm 52 engaged at both sides of the driving shaft 36 with a pedal shaft 53, the other side of the plate pedal 50 being connected with a fixing rope 60 having a certain length mounted at the rope groove 65 of the rope fixtures 62 and 64.

[8] The bicycle of claim 7, further comprising an idle bearing 56 at an outer side of the hub unit of the rear wheel 22 so that the plate pedal 50 can smoothly rotate.

[9] The bicycle of either claim 7 or claim 8, wherein said front wheels are formed of two wheels.

[10] In a bicycle which includes a front wheel and a rear wheel engaged at a front side and a rear side, respectively, a handle post connected at a shaft of the front wheel, a handle fixed at an upper side of the handle post, a support frame which is horizontally connected between the handle post and the rear wheel, a driving shaft which is rotatable at a center of the support frame, and a chain which connects a driving sprocket wheel engaged at one side of the driving shaft and a driven sprocket wheel fixed at a hub unit of the rear wheel, a standup type small bicycle for exercise, comprising: a pedal support member 66 which is engaged at a support frame 20 of the rear wheel 22 at a certain height; a I-shaped pedal rod 67 of which each side is hinged at both ends of the pedal support member 66; and a plate pedal 50 which is formed in a plate shape, one side of the plate pedal being connected with a driving shaft pedal arm 52 engaged at both sides of the driving shaft 36 with a pedal shaft 53, the other side of the plate pedal being hinged at a lower end of the pedal rod 67.

[11] The bicycle of claim 10, wherein said pedal support member 66 further comprises a height adjusting means for adjusting a height.

[12] In a bicycle which includes a front wheel and a rear wheel engaged at a front side and a rear side, respectively, a handle post connected at a shaft of the front wheel, a handle fixed at an upper side of the handle post, a support frame which is horizontally connected between the handle post and the rear wheel, a driving shaft which is rotatable at a center of the support frame, and a chain which connects a driving sprocket wheel engaged at one side of the driving shaft and a driven sprocket wheel fixed at a hub unit engaged at a center of the rear wheel, a standup type small bicycle for exercise, comprising: a plate pedal 50 which is formed in a plate shape, one side of the plate pedal being connected with a driving shaft pedal arm 52 engaged at both sides of the driving shaft 36 with a pedal shaft 53, the other side of the plate pedal being connected at a hub unit of the rear wheel 22; wherein the hub unit of the rear wheel 22 connected with the plate pedal 50 includes a rear wheel extension shaft 97 which is extended from the hub shaft, and a support bearing 96 which is engaged at the rear wheel extension shaft 97.

[13] The bicycle of claim 12, further comprising a safe guide rod 95 which is engaged

at the support frame 20 for preventing an escape of the plate pedal 50 mounted on an upper side of the support bearing 96.

Description:

Description STANDUP TYPE SMALL BICYCLE FOR EXERCISE

Technical Field

[1] The present invention relates to a standup type small bicycle for exercise, and in particular to a standup type small bicycle for exercise in which a saddle is removed from a conventional bicycle, and a plate pedal is longitudinally formed so that a pedal connected with a driving sprocket wheel is extended to a hub shaft of a rear wheel as if a user steps on a plate pedal with whole bodies in a posture of riding a kick board for thereby maximizing an exercise effect, and kids can easily use the bicycle. Background Art

[2] As shown in Figure 14, a conventional bicycle includes a front wheel 13 and a rear wheel 23 at its front and rear sides. A handle post 26 is connected with a shaft of the front wheel 13, and a handle 10 is fixed at the upper side of the same. A support frame 20 is connected between the handle post 26 and the rear wheel 23 in the horizontal and downward directions. A saddle 28 fixed at a saddle frame is provided at an intermediate portion of a support frame 20 at a slanted angle in up and down directions.

[3] A driving shaft is drivingly connected at a lower side of the support frame 20 in left and right directions. A pedal 58 is engaged at a driving shaft pedal arm 52 at both sides of the driving shaft with a certain length. A driving sprocket wheel 30 is fixed at one side of the driving shaft, and a driven sprocket wheel is fixed at a hub of the rear wheel 23. A chain 32 connects the driving sprocket wheel 30 and the driven sprocket wheel. A baggage rest 29 is installed at an upper side of the rear wheel 23.

[4] In the above conventional bicycle, when a user steps on each pedal 58 while sitting on the saddle 28, the rotational force is applied to the driving shaft. The driving sprocket wheel 30 connected with the driving shaft rotates, and the driven sprocket wheel connected through the chain 32 rotates for thereby generating a running force. With the generated running force, the bicycle is not slanted, but runs straight.

[5] In other words, the front wheel of the bicycle has a steering function, and the rear wheel operates by the user's feet, so that the bicycle goes forwards. The front wheel and rear wheel may independently operate by a manual type brake.

[6] However, the conventional bicycle has a problem lying in that since the force for stepping on the pedal is directly transferred to the wheels through the chain, the stepping force may a lot lose. At least one of two feet should wait for the full transfer of the stepping force based on a running situation.

[7] In addition, since the conventional cycle is formed in an inline shape with one front wheel and one rear wheel, a bicycle beginner falls down so many times when first

learning how to ride. With many times of falling down, the user can learn how to balance the bicycle and body. Sometimes, the user may have a big accident while learning the riding of the bicycle. Disclosure of Invention

Technical Problem

[8] Accordingly, it is an object of the present invention to provide a standup type small bicycle for exercise which overcomes the problems encountered in the conventional art.

[9] It is another object of the present invention to provide a new standup type small bicycle for exercise in which an energy loss is minimized by stepping on the pedal with whole bodies, and an exercise effect is maximized.

[10] It is further another object of the present invention to provide a new standup type small bicycle for exercise in which a saddle is removed from a conventional bicycle, and a plate pedal is longitudinally formed so that a pedal connected with a driving sprocket wheel is extended to a hub shaft of a rear wheel as if a user steps on a plate pedal with whole bodies in a posture of riding a kick board for thereby maximizing an exercise effect, and kids can easily use the bicycle. Technical Solution

[11] To achieve the above objects, in a bicycle which includes a front wheel and a rear wheel engaged at a front side and a rear side, respectively, a handle post connected at a shaft of the front wheel, a handle fixed at an upper side of the handle post, a support frame which is horizontally connected between the handle post and the rear wheel, a driving shaft which is rotatable at a center of the support frame, and a chain which connects a driving sprocket wheel engaged at one side of the driving shaft and a driven sprocket wheel fixed at a hub unit engaged at the rear wheel, there is provided a standup type small bicycle for exercise which comprises a plate pedal 50 which is formed in a plate shape, one side of the plate pedal being connected with a driving shaft pedal arm 52 engaged at both sides of the driving shaft 36 with a pedal shaft 53, the other side of the plate pedal being connected with a driven shaft pedal arm 54 engaged at a hub unit of the rear wheel 22 with a pedal shaft 55.

[12] The hub unit comprises a hub body 71 which is connected with the rear wheel 22; a hub shaft 70 which passes through the hub body 71 and freely rotates; a plurality of steel bearings 72 which decrease a frictional force so that the hub shaft 70 can freely rotate with respect to the hub body 71; a conical nut 73 which is thread-engaged at the hub shaft 70 for preventing an escape of the steel bearings 72; a shaft rotation bearing 76 which fixes a frame fixing bar 75 formed in a ring shape at an end of the support frame 20 and allows the hub shaft 70 to freely rotate; and a tapered pin 51 which fixes

the driven shaft pedal arm 54 to the hub shaft 70.

[13] The shaft rotation bearing 76 is mounted at an inner side of the frame fixing bar 75, and an outer circumference of the mounted shaft rotation bearing 76 is fixed by the frame fixing bar 75 by the frame fixing bolt 78, said bicycle further comprising a first fixing nut 74 which is thread-engaged at the hub shaft 70 for preventing a loosening of the conical nut 74, and a second fixing nut 77 for fixing the shaft rotation bearing 76 to the hub shaft 70.

[14] On the other hand, the hub unit comprises a hub body 71 which is connected with the rear wheel 22; a through hub shaft 82 which is inserted into the hub body 71; a plurality of steel bearings 72 which decrease a frictional force so that the hub body 71 can freely rotate with respect to the through hub shaft 82 ; a conical nut 73 which is thread-engaged at the through hub shaft 82 for preventing an escape of the steel bearings 72; a fixing nut 74 which fixes the conical nut 73; a fixing nut 83 which fixes a ring shaped frame fixing bar 87 formed at an end of the support frame 20; an insertion shaft bearing 84 having one side in which a plurality of steel bearings 88 are mounted for thereby forming a bearing part and the other side in which a female thread is formed for an engagement with the through hug shaft 82; a hub insertion shaft 80 which passes through the insertion shaft bearing 84 and the through hub shaft 82; a conical nut 85 which prevents an escape of the steel bearings 88 toward the outside and allows the hub insertion shaft 80 to independently rotate with respect to the through hub shaft 82; a fixing nut 86 which fixes the conical nut 85 to the hub insertion shaft 80; and a tapered pin 51 which fixes the driven shaft pedal arm 54 to an end of the hub insertion shaft 80.

[15] There is further provided a sync sprocket 90 which is engaged at the driving shaft 36, a rear wheel sync sprocket 91 which is engaged at the hub unit of the rear wheel 22, and a chain which connects the sync sprocket 90 and the rear wheel sync sprocket 91.

[16] The front wheels are formed of two wheels.

[17] In a bicycle which includes a front wheel and a rear wheel engaged at a front side and a rear side, respectively, a handle post connected at a shaft of the front wheel, a handle fixed at an upper side of the handle post, a support frame which is horizontally connected between the handle post and the rear wheel, a driving shaft which is rotatable at a center of the support frame, and a chain which connects a driving sprocket wheel engaged at one side of the driving shaft and a driven sprocket wheel fixed at a hub unit of the rear wheel, there is provided a standup type small bicycle for exercise which comprises rope fixtures 62 and 64 which are connected with an upper side in the support frame 20 of the rear wheel 22, each end of the rope fixtures being outwardly bent and forming a rope groove 65; and a plate pedal 50 which is formed in a plate shape, one side of the plate pedal being connected with a driving shaft pedal

ami 52 engaged at both sides of the driving shaft 36 with a pedal shaft 53, the other side of the plate pedal 50 being connected with a fixing rope 60 having a certain length mounted at the rope groove 65 of the rope fixtures 62 and 64.

[18] There is further provided an idle bearing 56 at an outer side of the hub unit of the rear wheel 22 so that the plate pedal 50 can smoothly rotate.

[19] In a bicycle which includes a front wheel and a rear wheel engaged at a front side and a rear side, respectively, a handle post connected at a shaft of the front wheel, a handle fixed at an upper side of the handle post, a support frame which is horizontally connected between the handle post and the rear wheel, a driving shaft which is rotatable at a center of the support frame, and a chain which connects a driving sprocket wheel engaged at one side of the driving shaft and a driven sprocket wheel fixed at a hub unit of the rear wheel, there is provided a standup type small bicycle for exercise which comprises a pedal support member 66 which is engaged at a support frame 20 of the rear wheel 22 at a certain height; a I-shaped pedal rod 67 of which each side is hinged at both ends of the pedal support member 66; and a plate pedal 50 which is formed in a plate shape, one side of the plate pedal being connected with a driving shaft pedal arm 52 engaged at both sides of the driving shaft 36 with a pedal shaft 53, the other side of the plate pedal being hinged at a lower end of the pedal rod 67.

[20] The pedal support member 66 further comprises a height adjusting unit for adjusting a height.

[21] In a bicycle which includes a front wheel and a rear wheel engaged at a front side and a rear side, respectively, a handle post connected at a shaft of the front wheel, a handle fixed at an upper side of the handle post, a support frame which is horizontally connected between the handle post and the rear wheel, a driving shaft which is rotatable at a center of the support frame, and a chain which connects a driving sprocket wheel engaged at one side of the driving shaft and a driven sprocket wheel fixed at a hub unit engaged at a center of the rear wheel, there is provided a standup type small bicycle for exercise which comprises a plate pedal 50 which is formed in a plate shape, one side of the plate pedal being connected with a driving shaft pedal arm 52 engaged at both sides of the driving shaft 36 with a pedal shaft 53, the other side of the plate pedal being connected at a hub unit of the rear wheel 22; wherein the hub unit of the rear wheel 22 connected with the plate pedal 50 includes a rear wheel extension shaft 97 which is extended from the hub shaft, and a support bearing 96 which is engaged at the rear wheel extension shaft 97.

[22] There is further provided a safe guide rod 95 which is engaged at the support frame

20 for preventing an escape of the plate pedal 50 mounted on an upper side of the support bearing 96.

Advantageous Effects

[23] In the present invention, the height and length of the body except for the handle is a little bit smaller than the conventional bicycle. So, it is possible to manufacture at a lower cost. [24] Since the weight of the whole body is a source of driving force, it is possible to easily go a slanted way. Since a wide plate pedal is used, it is possible to stable ride in a standup posture. [25] The standup type small bicycle for exercise according to the present invention may be used for just entertainments as well as exercises. The user can enjoy another type of ride as compared to the conventional bicycle in which the user rides in a seated posture.

Brief Description of the Drawings

[26] The present invention will become better understood with reference to the accompanying drawings which are given only by way of illustration and thus are not limitative of the present invention, wherein; [27] Figure 1 is a view illustrating a standup type small bicycle for exercise according to a first embodiment of the present invention; [28] Figure 2 is a disassembled perspective view illustrating important elements of a standup type small bicycle for exercise according to a first embodiment of the present invention; [29] Figure 3 is a cross sectional view illustrating a rear wheel hub unit in a standup type small bicycle for exercise according to a first embodiment of the present invention; [30] Figure 4 is a cross sectional view illustrating another example of a rear wheel hub unit in a standup type small bicycle for exercise according to a first embodiment of the present invention; [31] Figure 5 is a view illustrating a standup type small bicycle for exercise according to a second embodiment of the present invention; [32] Figure 6 is a view illustrating a standup type small bicycle for exercise according to a third embodiment of the present invention; [33] Figure 7 is a disassembled perspective view illustrating important elements of a standup type small bicycle for exercise according to a third embodiment of the present invention; [34] Figure 8 is a view illustrating a standup type small bicycle for exercise according to a fourth embodiment of the present invention; [35] Figure 9 is a cross sectional view illustrating a rear wheel hub unit in a standup type small bicycle for exercise according to a fourth embodiment of the present invention; [36] Figure 10 is a cross sectional view illustrating another example of a rear wheel hub

unit in a standup type small bicycle for exercise according to a fourth embodiment of the present invention;

[37] Figure 11 is a plane view illustrating a standup type small bicycle for exercise according to a fifth embodiment of the present invention;

[38] Figure 12 is a view illustrating a standup type small bicycle for exercise according to a sixth embodiment of the present invention;

[39] Figure 13 is a view illustrating a standup type small bicycle for exercise according to a seventh embodiment of the present invention; and

[40] Figure 14 is a view illustrating a conventional bicycle.

Best Mode for Carrying Out the Invention

[41] According to the present invention, in a bicycle which includes a front wheel and a rear wheel engaged at a front side and a rear side, respectively, a handle post connected at a shaft of the front wheel, a handle fixed at an upper side of the handle post, a support frame which is horizontally connected between the handle post and the rear wheel, a driving shaft which is rotatable at a center of the support frame, and a chain which connects a driving sprocket wheel engaged at one side of the driving shaft and a driven sprocket wheel fixed at a hub unit engaged at the rear wheel, there is provided a standup type small bicycle for exercise which comprises a plate pedal 50 which is formed in a plate shape, one side of the plate pedal being connected with a driving shaft pedal arm 52 engaged at both sides of the driving shaft 36 with a pedal shaft 53, the other side of the plate pedal being connected with a driven shaft pedal arm 54 engaged at a hub unit of the rear wheel 22 with a pedal shaft 55. Mode for the Invention

[42] The standup type small bicycle for exercise according to the present invention will be described with reference to the accompanying drawings. When reference numerals are given to the elements of the drawings, the same elements are given the same reference numerals even when they appear on other drawings. The descriptions of the known functions and construction, which deem to make the subject matters of the present invention unobvious, will be omitted.

[43] Figure 1 is a view illustrating a standup type small bicycle for exercise according to a first embodiment of the present invention, Figure 2 is a disassembled perspective view illustrating important elements of a standup type small bicycle for exercise according to a first embodiment of the present invention, Figure 3 is a cross sectional view illustrating a rear wheel hub unit in a standup type small bicycle for exercise according to a first embodiment of the present invention, and Figure 4 is a cross sectional view illustrating another example of a rear wheel hub unit in a standup type small bicycle for exercise according to a first embodiment of the present invention.

[44] Figure 5 is a view illustrating a standup type small bicycle for exercise according to a second embodiment of the present invention, Figure 6 is a view illustrating a standup type small bicycle for exercise according to a third embodiment of the present invention, Figure 7 is a disassembled perspective view illustrating important elements of a standup type small bicycle for exercise according to a third embodiment of the present invention, Figure 8 is a view illustrating a standup type small bicycle for exercise according to a fourth embodiment of the present invention, Figure 9 is a cross sectional view illustrating a rear wheel hub unit in a standup type small bicycle for exercise according to a fourth embodiment of the present invention, Figure 10 is a cross sectional view illustrating another example of a rear wheel hub unit in a standup type small bicycle for exercise according to a fourth embodiment of the present invention;

[45] Figure 11 is a plane view illustrating a standup type small bicycle for exercise according to a fifth embodiment of the present invention, Figure 12 is a view illustrating a standup type small bicycle for exercise according to a sixth embodiment of the present invention, and Figure 13 is a view illustrating a standup type small bicycle for exercise according to a seventh embodiment of the present invention.

[46] As shown in Figures 1 through 4, the standup type small bicycle for exercise according to a first embodiment of the present invention comprises a front wheel 14 and a rear wheel 22 engaged at a front side and a rear side, respectively, a handle post 26 which is connected with a shaft 12 of the front wheel 14, a handle 10 which is fixed at an upper side of the handle post 26, a support frame 20 which is horizontally connected between the handle post 26 and the rear wheel 22, a driving shaft 36 which is rotatably connected at a center portion of the support frame 20 in left and right directions, a driving sprocket wheel 30 which is engaged at one side of the driving shaft 36, and a chain 32 which connects a driven sprocket wheel 34 fixed at a hub of the rear wheel 22.

[47] The present invention further comprises a plate pedal 50 which is formed in a plate shape having a certain length, one side of the same being connected with a driving shaft pedal arm 52 engaged at both sides of the driving shaft 36 with a pedal shaft 53, the other end of the same being connected at a driven shaft pedal arm 54 engaged at a hub unit of the rear wheel 22 with a pedal shaft 55.

[48] The hub unit is connected with the driven shaft pedal arm 54 and a tapered pin 51 as a known hub shaft 70 is extended outwards.

[49] As shown in Figures 2 and 3, the hub unit according to a first embodiment of the present invention comprises a hub body 71 connected with the rear wheel 22, a hub shaft 70 which passes through the hub body 71 and freely rotates, a plurality of steel bearings 72 which decreases a frictional force so that the hub body 71 and the hub

shaft 70 can smoothly rotate, a conical nut 73 which is thread-connected at the hub shaft 70 for preventing an escape of the steel bearings 72, a fixing nut 74 which is thread-engaged with the hub shaft 70 for preventing the conical nut 73 from being loosened, a shaft rotation bearing 76 which fixes a frame fixing bar connected with an end of the support frame 20 in a ring shape and allows the hub shaft 70 to freely rotate, and a fixing nut 77 which fixes the shaft rotation bearing 76 to the hub shaft 70.

[50] The hub shaft 70 is formed as a known hub shaft is further extended outwards and integrally comprises a conical nut 73 which is independently rotated with respect to the hub body 71, fixing nuts 74 and 77 for fixing the conical nut 73 and the inner circumference of the shaft rotation bearing 76, respectively, and a driven shaft pedal arm 54 which is connected with the tapered pin 51. As shown in Figure 3, the shaft rotation bearing 76 is thread-engaged at the hub shaft, but may be engaged by force. As shown in Figure 2, the shaft rotation bearing 76 is mounted at an inner side of the frame fixing bar 75, and an outer circumference of the mounted shaft rotation bearing 76 is fixed at the frame fixing bar 75 by the frame fixing bolt 78.

[51] Therefore, the driven shaft pedal arm 54 is independently engaged at the hub shaft 70 through the frame fixing bar 75 of the support frame 20 and the shaft rotation bearing 76, and rotates, and the hub shaft 70 is independently rotated with respect to the hub body 71 through the conical nut 73.

[52] Figure 4 is a cross sectional view illustrating another example of a hub unit according to a first embodiment of the present invention in which a new shaft is inserted into a known hub shaft.

[53] In other words, in a known hub unit which comprises a through hub shaft 82 inserted into the hub body 71, a plurality of steel bearings 72 which decrease a frictional force so that the hub body 71 and the through hub shaft 82 smoothly rotate, and a conical nut 73 which is thread-engaged at the through hub shaft 82 for preventing an escape of the steel bearings 72, a new hub insertion shaft 80 is inserted into the through hub shaft 82.

[54] The fixing nut 74 is thread-engaged at the through hub shaft 82 for fixing the conical nut 73. It is thread-engaged with the fixing nut 83 so that a ring shaped frame fixing bar 87 formed at an end of the support frame 20 is fixed. A plurality of steel bearings 88 are mounted at one side, and the insertion shaft bearing 84 having a female thread for an engagement with the through hub shaft 82 is thread-engaged at the other side. There are provided a conical nut 85 which prevents an escape of the steel bearings 88 and allows the hub insertion shaft 80 to rotate independently with respect to the through hub shaft 82, a fixing nut 86 which fixes the conical nut 85 to the hub insertion shaft 80, and a driven shaft pedal arm 54 which is fixed at an end of the hub insertion shaft 80 with a tapered pin 51.

[55] The hub insertion shaft 80 connected with the driven shaft pedal arm 54 rotates inde-

pendently with respect to the frame fixing bar 87 and the through hub shaft 82 by the insertion shaft bearing 84.

[56] The plate pedal 50 is inserted into the pedal shafts 53 and 55 vertically connected at the ends of the driving shaft pedal arm 52 and the driven shaft pedal arm 54 respectively and rotates, and the driving shaft pedal arm 52 and the driven shaft pedal arm 54 are fixed at the driving shaft 36 and the hub shaft 70 and the hub insertion shaft 80 with the tapered pin 51. In addition, the plate pedal 50 connected with the pedal shaft 55 of the rear wheel has a margin 59 larger than the pedal shaft 55 so that the pedal shaft 55 can smoothly rotate.

[57] As shown in Figure 5, the standup type small bicycle for exercise according to a second embodiment of the present invention comprises two front wheels 15 and 16 for thereby forming a three- wheel bicycle.

[58] As shown in Figures 6 and 7, the standup type small bicycle for exercise according to a third embodiment of the present invention, the rear side of the plate pedal 50 is connected at rope fixtures 62 and 64 formed vertically with respect to the support frame 20 with a fixing rope 60.

[59] The rope fixtures 62 and 64 are connected to the upper side at the support fame 20 of the rear wheel 22, with a rope groove 65 being formed at the end of the bent part. With the above construction, the fixing rope 60 is prevented from being escaped to the outside. One end of the fixing rope 60 is provided with a loop 61 for being mounted at the rope groove 65 and is connected with the rope fixtures 62 and 64, and the other side of the same is connected with the plate pedal 50.

[60] Here, an idle bearing 56 may be further provided at an outer side of the hub unit of the rear wheel 22, so that the plate pedal 50 is more smoothly rotated.

[61] As shown in Figure 8, the standup type small size bicycle according to the fourth embodiment of the present invention comprises a sync sprocket 90 engaged at the driving shaft 36, a rear wheel sync sprocket 91 engaged at the hub shaft 70, and a chain which connects the above elements. In other words, there is provided a sync element for matching the driving shaft 36 and the hub shaft 70. The sync element may be formed of one among the first through third embodiments of the present invention.

[62] As shown in Figure 9, the rear wheel sync sprocket 91 engaged at the hub shaft 70 is engaged between the conical nut 73 and the fixing nut 74 which fixes the shaft rotation bearing 76.

[63] As shown in Figure 3, in the case that the through hub shaft 82 is used, as shown in

Figure 10, the rear wheel sync sprocket 91 is engaged at the hub insertion shaft 80. Namely, the rear wheel sync sprocket 91 is positioned outside the conical nut 85 and is fixed with the fixing nut 86.

[64] As shown in Figures 9 and 10, the rear wheel sync sprocket 91 is engaged near the

pedal arm 54 of the driven shaft of the left side. It is known by those skilled in the art that it may be engaged near the pedal arm of the driven shaft of the right side, and the sync sprocket 90 connected with the chain is engaged at the driving shaft 36 of the right side.

[65] As shown in Figure 3, in the case that the through hub shaft 82 is used, as shown in

Figure 10, the rear wheel sync sprocket 91 is engaged at the hub insertion shaft 80. Namely, the rear wheel sync sprocket 91 is positioned outside the conical nut 85 and is fixed with the fixing nut 86.

[66] As shown in Figure 11, the fifth embodiment of the present invention comprises a tricycle. In other words, there are provided a double wheel shaft 94 which connects a pair of rear wheels 24 and 25, and a differential gear unit 93 which allows the rear wheels 24 and 25 to rotate differentially. At this time, the differential gear unit 93 is engaged at the double wheel shaft 94. Since the construction and function are known like in the conventional differential gear device, the detailed description of the same will be omitted. Instead the differential gear unit 93, the gear device in which rear wheels 24 and 25 rotate independently from each other may be used.

[67] The driven sprocket wheel 34 is engaged at the double wheel shaft 94 for thereby receiving a driving force from the driving sprocket wheel 30 via the chain 32.

[68] According to the sixth embodiment of the present invention, the I-shaped pedal rod

67 is used instead the fixing rope 60 of the third embodiment. As shown in Figure 12, there is provided a pedal support member 66 which is engaged at the support frame 20 at a certain height.

[69] An upper hinge 68 formed at an upper end of the pedal rod 67 in a T shape is engaged at both ends of the pedal support member 66, and the plate pedal 50 and the lower hinge 69 are engaged at the lower end of the same.

[70] So, the pedal support member 66, the pedal rod 67 and the plate pedal 50 are stably connected with each other.

[71] Here, the pedal support member 66 is installed so that it's height can be freely adjusted. Namely, it is preferred that the angle of the motion of the plate pedal 50 can be adjusted. In other words, in case that the angle of the plate pedal 50 is large, more exercise effects can be obtained. A height adjusting element for adjusting the height of the pedal support member 66 is known. It may be preferably formed of two hollow pipes which are overlapped. The overlapped pipes may be fixed using the screws in a conventional method.

[72] As shown in Figure 13, according to the seventh embodiment of the present invention, the rear side of the plate pedal 50 is mounted on the upper side of the support bearing 96 which is engaged at the rear wheel extension shaft 97 extended from the hub shaft 70 or the hub insertion shaft 80.

[73] Here, the plate pedal 50 slides along the upper side of the support bearing 96. At this time, a safe guide rod 95 is engaged at the support frame 20 so as to prevent an escape of the plate pedal 50.

[74] The operation and effects of the standup type small bicycle for exercise according to the present invention will be described.

[75] First, since the saddle is removed from the conventional bicycle, a user is needed to just step on the pedal in a standup posture. In other words, since the user steps on with whole bodies, a stronger driving force is needed.

[76] Since the user steps on the plate pedal 50, the effects of the exercise are maximized.

[77] Two front wheels 15 and 16 or two rear wheels 24 and 25 may be adapted, so that the kids can stably ride the bicycle in a balanced posture.

[78] The rear side of the plate pedal 50 may be fixed with the fixing rope 60 having a certain height instead the rear side of the same is connected with the hub shaft, so that it is possible to obtain another type of exercise.

[79] In other words, the length of the rear side of the plate pedal 50 is fixed by the fixing rope 60, so that an inclination of the plate pedal 50 changes based on the rotation of the driving shaft pedal arm 52, whereby the whole bodies can be slanted for thereby maximizing the exercise effects.

[80] The above-described construction may be implemented in a similar method with a kick board(for example, scooter kick board, sing-sing car). The present invention may be widely used as a playing facility or toys that children like so much. The present invention may be used for the purpose of developing a neural system of kids. An over load is not given to the body, and the present invention is durable and stable. Children can enjoy with the present invention. The present invention may be used as a kind of kid's exercises for toys.

[81] The kick board, which has been widely used for leisure sports, is provided with wheels at its front and rear sides. A handle is engaged at a front upper handle post of a board. User's legs are placed on the board, so that the user can enjoy more effectively. There are many kinds of kick boards.

[82] However, in the present invention, since the user rides while rotating the plate pedal whereas the user rolls the board in the kick board, adults as well as kids can easily enjoy the present invention.

[83] A chain is generally used for transferring a driving force in a conventional bicycle.

The chain may be detached from its normal engaged way by means of an abnormal driving force during a running operation or may damage a user's trousers. A sprocket gear may be used instead the chain for transferring a driving force of a driving sprocket wheel to a driven sprocket wheel(for example, Korean patent registration numbers 0542794 and 0527093).

[84] Here, the driving sprocket wheel and the driven sprocket wheel are substituted with a crown sprocket gear and a plane sprocket gear, respectively. A roller gear is provided for engaging the crown sprocket gear and the plane sprocket gear at a certain angle. The detailed construction and operations of the above disclosed art will be omitted, but it may be applied to a standup type small bicycle for exercise of the present invention.

[85] In addition, a direct driving force is transferred to a rear wheel via a driving force transfer and a transmission gear apparatus formed of a plurality of gears instead a chain and a sprocket so as to overcome the problems encountered in a conventional chain(for example, Korean Utility model laid-open number 20-1986-0000757). In other words, in the present invention, a driving sprocket wheel and a chain are removed, and a plurality of gears are engaged at a rear wheel unit instead, so that a driving force of a pedal arm of a driven shaft is directly transferred to a rear wheel via the above gears. In addition, a clutch unit is provided for rotating a pedal arm of a driven shaft in a direction reverse to a running direction of a bicycle by controlling a driving force transfer to the rear wheel via the gears. The above construction may be easily combined to our present invention by those who are skilled in the art.

[86] Here, since the driving force transfer and transmission gear apparatus are well-known arts, the construction and operations of the same will be omitted. Industrial Applicability

[87] In the present invention, the height and length of the body except for the handle is a little bit smaller than the conventional bicycle. So, it is possible to manufacture at a lower cost.

[88] Since the weight of the whole body is a source of driving force, it is possible to easily go a slanted way. Since a wide plate pedal is used, it is possible to stable ride in a standup posture.

[89] The standup type small bicycle for exercise according to the present invention may be used for just entertainments as well as exercises. The user can enjoy another type of ride as compared to the conventional bicycle in which the user rides in a seated posture.

[90] As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described examples are not limited by any of the details of the foregoing description, unless otherwise specified, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims. Sequence Listing

[91] exercise, bicycle, plate pedal, pedal arm, driving shaft, hub unit