KR20090048937A - Bicycle - Google Patents

Abstract

The present invention relates to a bicycle having a front wheel, a rear wheel that rotates by a rotational force of a pedal, and a frame rotatably supporting the front wheel and the rear wheel, comprising: a saddle disposed on an upper side of the frame; A pedal rotation shaft provided rotatably in the frame and rotating by the pedal; A rear wheel shaft spaced apart from the pedal rotation shaft and rotatably installed on the frame, and having a rear wheel mounted thereon; An auxiliary rotating shaft spaced apart from the rear wheel shaft and rotatably installed on the frame; A main power transmission unit interconnecting the pedal rotation shaft and the rear wheel shaft and transmitting the rotational force generated from the pedal rotation shaft to the rear wheel shaft; An auxiliary power transmission unit interconnecting the rear wheel shaft and the auxiliary rotation shaft and transmitting the rotational force generated from the rear wheel shaft to the auxiliary rotation shaft; The cam is coupled to the auxiliary rotating shaft and the cam profile is formed on the outer periphery, the cam roller rolling and reciprocating in contact with the outer periphery of the cam, and the cam roller is rotatably coupled and supports the saddle. It has a, characterized in that it comprises a motion conversion unit for elevating the saddle by converting the rotational movement of the auxiliary rotation axis into a linear reciprocating motion. As a result, the body fat can be decomposed to achieve a diet effect, the muscles of the lower body can be strengthened, and the upper body muscles or the lower back exercise can be simultaneously performed to increase the exercise effect.

Description

Bicycle {BICYCLE}

The present invention relates to a bicycle, and more particularly, to a bicycle in which the saddle lift structure is improved to raise and lower the saddle using the rotational force of the rear wheel regardless of the rotation of the pedal.

As the obesity population is rapidly increasing for modern people who lack exercise compared to the food consumed by the development of civilization, the importance of health due to adult diseases is a hot topic.

Various diet products are being introduced to reduce body fat due to obesity, which is the cause of adult disease, but it is developed without considering professionalism, and the diet effect is not reviving on expectations.

Various electric vibration belts using electricity are used to reduce belly fat, but vibration of some parts of the body while standing or sitting does not provide a condition where body fat is decomposed. However, the moment you use the belt, you will feel cool and will not reach the conditions where your body fat can be broken down.

Recently, meridian massage using microscopic movements has become popular to remove or reduce body fat accumulated in the belly, thighs, and face.However, when the masseuse is massaged, the accumulated fat is partially distributed to other places. It only has an effect, but after a while, it goes back to its original state, which also does not match the effect.

It is true that ordinary people as well as experts have a lack of awareness of exercise, so they tend to concentrate on exercise for physical fitness, which is a stumbling block to exercise while doing short time exercise. It also helps with muscle movement, but it is not very helpful in breaking down body fat.

In addition, bicycling and indoor bicycle riding for aerobic exercise is helpful for aerobic exercise, but there is little fine movement along the entire body and is focused on lower body muscle training.

Walking or running exercise is not expected to exercise if you walk or run for a while, if you walk or run for a long time may cause abnormalities in the ankle and knee joints, exercise that requires attention.

In addition, when the body is an unnatural patient or a disabled person, there are not many exercise devices that can be used other than the exercise limited to the physical condition, and thus the rehabilitation of the treatment and rehabilitation purposes cannot be performed. Moreover, it is never a right exercise method to expect obesity due to lack of exercise by focusing only on the physical appearance.

Therefore, obesity due to lack of exercise is essential for body fat decomposition.

First, because the obesity is made at the current body temperature, the body temperature synergistic effect that the body fat can be decomposed through exercise should be induced, and after the body temperature rise, the motion is performed for a sufficient time to decompose the body fat. You need a big but effortless workout.

Second, if aerobic is not supplied to the body, body fat is not decomposed, so aerobic exercise requires a large and speedy movement, and it is a speedy movement to exercise for a sufficient time for body fat to decompose, but it does not take force. Should not.

Third, in order to evenly eliminate the body fat accumulated in the body, not part of the body, the slow motion of body fat should be followed according to all the body movements, so that the maximum amount of fine movement should be induced at the time of exercise.

On the other hand, the bicycle, which is widely used as an aerobic exercise device for body fat decomposition due to obesity due to lack of exercise, is one of the most popular leisure sports and invented to transmit the driving force generated by the pedaling of the passenger to the rear wheel by the chain. It is basically a fitness equipment designed to ride outdoors.

These bike rides are helpful for aerobic exercise, but there is little fine movement along the entire body and is focused on lower body muscle training.

In other words, the conventional bicycle is rotated by repeatedly stepping on the pedal in a state where the saddle and the pelvis are in close contact, focusing only on the training of the lower body muscles, there is a problem in that the upper body muscles or lower back movements are not made at all.

In addition, when riding a bicycle for a long time, the fatigue of the pelvis and waist, of course, there is a problem that the boredom is reduced due to the lack of interesting interest, the exercise interest is reduced.

The problem to be solved in the problem of the background art, according to the present invention, the saddle is elevated as the rear wheel rotates, regardless of the rotation of the pedal, to break down the body fat, promote the diet effect, and strengthen the muscles of the lower body Rather, the upper body muscles or waist movements are made at the same time to provide a bike that can increase the exercise effect.

In addition, another object of the present invention is to provide a bicycle that can variously adjust the lifting frequency of the saddle by varying the number of revolutions of the rear wheel in a multi-shift.

Means for Solving the Problems According to the present invention, in a bicycle having a front wheel steered by a handle, a rear wheel rotated by a rotational force of a pedal, and a frame rotatably supporting the front wheel and the rear wheel, A saddle disposed on the upper side; A pedal rotation shaft provided rotatably in the frame and rotating by the pedal; A rear wheel shaft spaced apart from the pedal rotation shaft and rotatably installed on the frame and on which the rear wheel is mounted; An auxiliary rotating shaft spaced apart from the rear wheel shaft and rotatably installed on the frame; A main power transmission unit interconnecting the pedal rotation shaft and the rear wheel shaft and transmitting the rotational force generated from the pedal rotation shaft to the rear wheel shaft; An auxiliary power transmission unit interconnecting the rear wheel shaft and the auxiliary rotation shaft and transmitting the rotational force generated from the rear wheel shaft to the auxiliary rotation shaft; A cam coupled to the auxiliary rotation shaft and having a predetermined camp profile on an outer circumference, a cam roller rolling and reciprocating in contact with the outer circumference of the cam, and the cam roller rotatably coupled to the saddle It has a saddle support for supporting, and converts the rotational movement of the auxiliary rotary shaft to a linear reciprocating motion to provide a bicycle comprising a motion conversion unit for lifting the saddle.

Here, the saddle support, the saddle rod for supporting the saddle; A sleeve to which the saddle rod is liftably coupled; An actuating rod to which the cam roller is rotatably coupled; A bracket for interconnecting the working rod and the sleeve such that the sleeve moves up and down as the working rod moves up and down; The guide rod penetrates the driving rod and guides the lifting of the operating rod, and the guide penetrates the sleeve and guides the lifting and lowering of the sleeve, and preferably includes a guide shaft supported by the frame. Do.

Preferably it further comprises a spring mounted to at least one of the sleeve and the working rod to cushion the impact load acting on the saddle.

By further comprising a saddle height adjustment unit for adjusting the height of the protrusion of the saddle rod relative to the sleeve, it is possible to freely adjust the height of the saddle.

By including a sleeve knob for selectively locking and unlocking the sleeve to the guide shaft such that the cam and the cam roller are in contact with and spaced apart from each other, the lifting movement of the saddle can be selectively selected.

The main power transmission unit, a drive sprocket mounted to the pedal rotation shaft; One or more driven sprockets mounted to the rear wheel shaft; It is preferable to include a main chain interconnecting any one of the drive sprocket and the driven sprocket, and transmits the rotational force generated from the pedal rotation shaft to the rear wheel shaft.

The driven sprocket is composed of a plurality of, each of the driven sprocket has a different diameter, so that the multi-stage can be changed to not only adjust the number of rotation of the rear wheel, but also to variously adjust the number of lifting of the saddle do.

The auxiliary power transmission unit includes a pair of auxiliary sprockets mounted to the rear wheel shaft and the auxiliary rotation shaft, respectively; It is preferable to include an auxiliary chain interconnecting the pair of auxiliary sprockets, and for transmitting the rotational force generated in the rear wheel shaft to the auxiliary rotation shaft.

Therefore, according to the above solution, the saddle is elevated as the rear wheel rotates irrespective of the rotation of the pedal, thereby decomposing body fat to achieve a diet effect, and to strengthen the muscles of the lower body, as well as the upper and lower body muscles. This can be done at the same time to increase the exercise effect. In addition, by varying the number of revolutions of the rear wheel in a multi-stage shift, the lifting frequency of the saddle can be variously adjusted.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 to 7 show a bicycle according to the invention. As shown in these figures, the bicycle according to the present invention, the front wheel 10, which is steered by the handle 15, the rear wheel 20 rotated by the rotational force of the pedal 35, the front wheel 10 and the rear wheel And a frame 25 rotatably supporting the 20.

The handle 15 for steering the front wheel 10 is disposed on the upper portion of the front wheel 10, the front wheel 10 and the handle 15 is connected to each other by a handle bar (17). The front wheel shaft 11 is coupled to the center of the front wheel 10, the front wheel shaft 11 is rotatably supported by the handle bar (17).

The rear wheel 20 is disposed at a distance from the front wheel 10, the rear wheel shaft 21 is coupled to the center of the rear wheel 20, the rear wheel shaft 21 is rotatably supported on the frame 25. .

The frame 25 forms a truss structure for connecting the front wheel 10 and the rear wheel 20. The frame 25 located above the front wheel 10 is provided with a fixed shaft 27 through which the handle bar 17 penetrates.

In addition, a pedal rotation shaft 31 that is rotated by the pedal 35 is rotatably installed in the frame 25 between the front wheel 10 and the rear wheel 20.

A pair of pedals 35 for rotating the pedal rotation shaft 31 are coupled to both ends of the pedal rotation shaft 31.

Meanwhile, the pedal rotation shaft 31 and the rear wheel shaft 21 are connected to each other by the main power transmission unit. The main power transmission unit includes a drive sprocket 41a mounted on the pedal rotation shaft 31, a plurality of driven sprockets 41b mounted on the rear wheel shaft 21, a drive sprocket 41a, and a plurality of driven sprockets 41b. The main chain 43 is connected to any one of the main chain 43 for transmitting the rotational force generated from the pedal rotation shaft 31 to the rear wheel shaft 21.

Each sprocket 41a, 41b is attached to one end of the pedal rotation shaft 31 and the rear wheel shaft 21 to form the same plane.

In particular, the plurality of driven sprockets 41b have different diameters so that the rotation speed of the rear wheel 20 can be changed by the operation of the shifting unit to be described later.

Here, it is preferable that the diameter of the drive sprocket 41a is relatively larger than the diameter of each driven sprocket 41b.

As a result, the main power transmission unit transmits the rotational force of the pedal rotation shaft 31 to the rear wheel shaft 21, and the rear wheel 20 has a driving function.

On the other hand, the bicycle according to the present invention further has a transmission unit of a known bicycle, the handle 15 is equipped with a shift operation unit 45, the main chain 43 on the rotational track of the main chain 43 a plurality of A shift lever 49 that is selectively hooked on any one of the driven sprockets 41b is disposed, and the shift lever 49 and the shift operation portion 45 are interconnected by a shift cable 47.

Thus, when the shift operation unit 45 is operated so that the shifting cable 47 is tensioned and relaxed during the rotation of the main chain 43, the shifting cable 47 tensions and relaxes the shift lever 49 so that the main chain ( 43 is selectively caught by any one of the plurality of driven sprockets 41b having different diameters. That is, as an example, when the main chain 43 is rotated while pulling the shifting cable 47 connected to the shift lever 49, the driven sprocket 41b of the plurality of driven sprockets 41b has a relatively large diameter. If the rear wheel 20 is rotated at a lower speed than the normal rotation speed, the shifting cable 47 is released, and the main chain 43 is rotated, the relatively smaller diameter of the plurality of driven sprockets 41b is caught. It is caught by the driven sprocket 41b and shifted at high speed so that the rear wheel 20 rotates at a higher speed than the normal rotation speed.

On the other hand, above the pedal rotary shaft 31, an auxiliary rotary shaft 51 which is spaced apart from the rear wheel shaft 21 and rotatably installed on the frame 25 is disposed.

The auxiliary rotary shaft 51 and the rear wheel shaft 21 are interconnected by the auxiliary power transmission unit. The auxiliary power transmission unit is connected to a pair of auxiliary sprockets 55 mounted on the rear wheel shaft 21 and the auxiliary rotation shaft 51 and the pair of auxiliary sprockets 55, respectively, and is generated from the rear wheel shaft 21. It has the auxiliary chain 57 which transmits rotational force to the auxiliary rotating shaft 51.

Each auxiliary sprocket 55 is mounted on the other end of the rear wheel shaft 21 and the auxiliary rotating shaft 51 at the same plane, spaced apart from the driving sprocket 41a and the driven sprocket 41b of the main power transmission unit.

As a result, the auxiliary power transmission unit transmits the rotational force of the rear wheel shaft 21 to the auxiliary rotation shaft 51. Thus, even when the rear wheel 20 is idling and continues to move forward in a state in which the pedal 35 is not rotated on the downhill, the rotational force of the rear wheel shaft 21 causes the respective auxiliary sprockets 55 and the auxiliary chains 57 to rotate. It is transmitted to the auxiliary rotation shaft 51 via, and the auxiliary rotation shaft 51 rotates as the rear wheel 20 rotates.

On the other hand, the saddle 61 on which the user's pelvis rests is disposed above the frame 25 between the front wheel 10 and the rear wheel 20, that is, above the auxiliary rotation shaft 51. Saddle 61 is lifted by the motion conversion unit for converting the rotational motion of the auxiliary rotary shaft 51 into a linear reciprocating motion.

The motion conversion unit is a cam 65 coupled to the auxiliary rotary shaft 51, a cam roller 67 for rolling and reciprocating in accordance with the rotation of the cam 65 in contact with the outer periphery of the cam 65, and a cam roller 67 Is rotatably coupled and has a saddle support 71 supporting the saddle 61.

On the outer circumference of the cam 65, a non-arc shaped camping profile having a pair of maximum radius of curvature and a pair of minimum radius of curvature is formed. Here, the camp profile of the cam 65 is not limited thereto, and may be variously formed.

Cam roller 67 is rotatably coupled to one end of the operating rod 77 of the saddle support 71 to be described later, in contact with the outer periphery of the cam 65 and rolls in accordance with the rotation of the cam 65 and reciprocates . Accordingly, the cam roller 67 converts the rotational motion of the cam 65 into a linear motion.

The saddle support 71 includes a saddle rod 73 supporting the saddle 61, a sleeve 75 to which the saddle rod 73 is liftable and an operating rod to which the cam roller 67 is rotatably coupled. (77), a bracket (79) interconnecting the actuation rod (77) and the sleeve (75) so that the sleeve (75) is elevated as the actuation rod (77) is elevated, the actuation rod (77) and the sleeve (75). Has a guide shaft 81 which is supported by the frame 25.

Saddle rod 73 has a bar shape having a predetermined length, one end of the saddle rod 73 is coupled through the inner periphery of the sleeve 75 so as to be lifted, the other end is saddle 61 is coupled.

The sleeve 75 has a hollow bar shape having a predetermined length and is coupled to the first guide hole 81a of the guide shaft 81 to be lifted and lowered through.

The actuating rod 77 has a bar shape having a predetermined length and is disposed perpendicular to the auxiliary rotation axis 51. The actuating rod 77 is liftably coupled to the second guide hole 81b of the guide shaft 81 to be described later.

The bracket 79 is disposed perpendicular to the lifting direction of the sleeve 75 and the actuating rod 77 to interconnect the sleeve 75 and the actuating rod 77.

The guide shaft 81 has a first guide hole 81a through which the actuating rod 77 penetrates and guides the lifting and lowering of the actuating rod 77, and a sleeve through which the sleeve 75 penetrates and guides the lifting and lowering of the sleeve 75. The two guide hole 81b is formed, and the 1st guide hole 81a and the 2nd guide hole 81b are spaced apart.

On the other hand, the bicycle according to the present invention, so that the saddle height adjustment unit 85, the cam 65 and the cam roller 67 to adjust the height of the projecting height of the saddle rod 73 relative to the sleeve 75 so as to contact and space each other. It has a knob 91 for the sleeve that selectively locks and unlocks the sleeve 75 on the guide shaft 81.

The saddle height adjusting part 85 is composed of a clamp 87 and a nut 89, and the saddle height adjusting part 85 clamps the saddle rod 73 to the sleeve 75. The clamp 87 contacts and is spaced apart from the outer circumference of the saddle rod 73, and closes the outer circumference of the saddle rod 73 by tightening the nut 89 to clamp the saddle rod 73 to the sleeve 75. . Thus, the lifting height of the saddle 61 can be freely adjusted.

A knob 91 for the sleeve is provided on one side of the guide shaft 81 to selectively lock and unlock the sleeve 75 to the guide shaft 81 so that the cam 65 and the cam roller 67 contact and space each other. do. Accordingly, when the sleeve 75 is locked to the guide shaft 81 by the sleeve knob 91 while the cam 65 and the cam roller 67 are spaced apart from each other, the sleeve 75 does not lift and the saddle ( 61. Also, when the knob 91 for the sleeve is unlocked and the sleeve 75 is unlocked from the guide shaft 81, the cam 65 and the cam roller ( 67 contacts each other so that the sleeve 75 moves up and down, and the saddle 61 also moves up and down.

In addition, the bicycle according to the present invention is mounted on the sleeve 75, has a spring 93 for cushioning the impact load acting on the saddle 61 during the lifting of the saddle 61. The spring 93 is mounted on the outer circumference of the sleeve 75 between the bracket 79 and the guide shaft 81.

In addition, the bicycle according to the present invention has a brake lever 95, a brake pad 97, and a brake cable 99 for braking the driving of the rear wheel 20.

The brake lever 95 is mounted on the handle 15, the brake pad 97 contacts and is spaced from the side of the rear wheel 20, and the brake lever 95 and the brake pad 97 are connected to the brake cable 99. Connected by

Accordingly, the brake cable 99 is tensioned and relaxed as the brake lever 95 is operated to contact and space the brake pads 97 to the side surfaces of the rear wheels 20, thereby providing the brake pads 97 and the rear wheels 20. Friction force between the is adjusted, it is possible to simply brake the driving of the rear wheel 20.

By this configuration, the use of the bicycle according to the present invention will be described.

First, the knob 91 for the sleeve is unlocked with the guide shaft 81 to bring the cam 65 and the cam roller 67 into contact with each other as shown in FIGS. 1 and 4.

Next, after releasing the clamp 87 of the saddle height adjustment part 85, the saddle rod 73 protrudes from the sleeve 75 according to the user's body shape, and then the clamp 87 is tightened with a nut 89. The height of the saddle 61 is adjusted by clamping.

As such, after adjusting the height of the saddle 61 according to the user's body shape, when the user presses the pedal 35 and rotates while sitting on the saddle 61, the pedal rotation shaft 31 and the rear wheel shaft 21 are It turns at the same time, and the bicycle moves forward.

At the same time, as the rear wheel shaft 21 rotates, the auxiliary rotation shaft 51 rotates, and thus the cam 65 rotates, so that the cam roller 67 in contact with the outer circumferential surface of the cam 65 is rotated. Rolling in accordance with the rotation converts the rotational movement of the cam 65 to a linear reciprocating movement.

On the other hand, when the cam roller 67 is in contact with the maximum radius of curvature of the cam 65, the cam roller 67 is spaced apart from the axis of the auxiliary rotary shaft 51 to the maximum, and the cam roller 67 of the cam 65 In contact with the minimum radius of curvature, the cam roller 67 is spaced apart from the axis of the auxiliary rotation shaft 51 at a minimum, so that the operating rod 77 and the sleeve 75 rotatably supporting the cam roller 67 are each Simultaneously elevating along the second guide hole 81b and the first guide hole 81a of each guide shaft 81, the saddle 61 mounted on the saddle rod 73 is also raised and lowered. At this time, if the transmission lever 45 is selectively connected to any one of the plurality of driven sprockets 41b having various diameters by the operation of the shift operation unit 45 while the main chain 43 is rotating, the rear wheel 20 ) And the rear wheel shaft 21 is shifted to various rotational speed, and as the rotational speed of the rear wheel shaft 21 is variously shifted, the rotational speed of the auxiliary rotation shaft 51 and the cam 65 also corresponds to this and variously shifted. In addition, the lifting number of the cam roller 67 and the saddle 61 is also variously adjusted.

Therefore, the bicycle according to the present invention requires a user to apply a lot of force to the pedal 35 to lift and lower the saddle 61 as well as the driving of the rear wheel 20, the decomposition of the user's body fat is promoted diet effect Promote, strengthen the muscles of the lower body, the muscles of the upper body or waist movement is made at the same time to increase the exercise effect.

In addition, the bicycle according to the present invention, when the rear wheel 20 rotates and continues to move forward in a state where the pedal 35 is not rotated on a downhill road, the rotational force of the rear wheel shaft 21 is rotated as the rear wheel 20 rotates. It is transmitted to the auxiliary rotation shaft 51 via each auxiliary sprocket 55 and the auxiliary chain 57, and according to the rotation of the cam 65 provided on the auxiliary rotation shaft 51, the cam roller 67 is rolled and the operating rod ( 77), the sleeve 75 and the saddle rod 73 are raised and lowered so that the saddle 61 swings up and down.

Meanwhile, as shown in FIG. 7, the rear wheel 20 is locked after locking the sleeve 75 to the guide shaft 81 by the sleeve knob 91 so that the cam 65 and the cam roller 67 are spaced apart from each other. Even if the auxiliary rotating shaft 51 rotates, the rotational force of the auxiliary rotating shaft 51 is not transmitted to the cam roller 67, so that the operating rod 77, the sleeve 75, the saddle rod 73, and the saddle 61 are rotated. Is not lifted, and thus the bicycle is only forward movement by driving the rear wheel (20).

Accordingly, by selectively locking and unlocking the sleeve 75 to the guide shaft 81 by the sleeve knob 91 so that the cam 65 and the cam roller 67 are in contact with and spaced apart from each other, the saddle 61 The lifting movement can be selectively selected.

Thus, by providing the exercise conversion unit for elevating the saddle by the rotation of the pedal and the rotation of the rear wheel shaft, the body fat is decomposed to achieve a diet effect, to strengthen the muscles of the lower body, as well as to exercise the muscles of the upper body and waist at the same time The effect can be increased.

In addition, by selectively connecting the main chain to any one of a plurality of driven sprockets having different diameters from the driving sprocket by operating the shifting lever, the number of rotations of the rear wheel and the rear wheel shaft can be varied in various ways, so that the number of lifts of the saddle can be varied. It can be adjusted.

On the other hand, in the above-described embodiment, the operating rod and the sleeve is described as being capable of lifting and lowering between the frame and the saddle rod, the bicycle according to the present invention is a saddle support to the frame as a saddle support without interposing the operating rod and the sleeve. It is provided to be movable up and down, and the cam roller which is always in contact with the cam is mounted on one end of the saddle rod, and as the rear wheel shaft rotates, the saddle can be always raised and lowered to ride the bicycle.

In addition, in the above-described embodiment, the cam and the cam roller are separated from each other by locking the sleeve knob so that the cam and the cam roller do not always come into contact or the cam and the cam roller do not come into contact with each other. Lock the knob for the sleeve so that the cam roller is positioned between the maximum turning radius, so that the cam and the roller are spaced apart, and as the cam rotates, the cam and the cam roller contact each other on the rotational track between the minimum and maximum turning radius of the cam. By rolling and reciprocating the cam roller, it is possible to adjust the height of the saddle's elevating swing.

In the above-described embodiment, the main power transmission unit of the pedal rotation shaft and the rear wheel shaft is described as having a driving sprocket, a driven sprocket, and a main chain to transmit the rotational force of the pedal, but a pair of belts are provided on the pedal rotation shaft and the rear wheel shaft. It is of course possible to transfer the rotational force of the pedal shaft to the rear wheel by mounting the pulleys and interconnecting each belt pulley with a belt.

In addition, in the above-described embodiment, as an auxiliary power transmission unit of the rear wheel shaft and the auxiliary rotation shaft, a pair of auxiliary sprockets and an auxiliary chain are provided to transmit the rotational force of the rear wheel shaft, but a pair is provided between the rear wheel shaft and the auxiliary rotation shaft. It is a matter of course that the belt pulley of the mounting and each belt pulley interconnected by the belt can transmit the rotational force of the rear wheel shaft to the auxiliary rotation shaft.

In addition, in the above-described embodiment, a spring for buffering the impact load acting on the saddle when the saddle is lifted is described as being mounted on the outer circumference of the sleeve, but the spring is mounted on the outer circumference of the working rod between the bracket and the guide shaft, It can also be mounted simultaneously on the outer periphery of the sleeve and the working rod.

It is apparent to those skilled in the art that the present invention is not limited to the described embodiments, and that various modifications and changes can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or variations will have to be belong to the claims of the present invention.

1 is a perspective view showing one embodiment of use of a bicycle according to the present invention,

2 is an exploded perspective view of the main part of FIG. 1;

3 is a front view of FIG. 1 showing a lifted state of the saddle;

Figure 4 is a front view of Figure 1 showing the operating state of the cam and the cam roller,

5 is a plan view of main parts of FIG.

6 is a rear view of FIG. 1;

7 is a perspective view showing another use embodiment of the bicycle according to the invention.

＊ Description of symbols for main parts of the drawings ＊

10: front wheel 15: steering wheel

20: rear wheel 21: rear wheel shaft

25 frame 31 pedal rotation axis

35 pedal 41a drive sprocket

41b: driven sprocket 43: main chain

45: shift operation portion 49: shift lever

51: secondary axis of rotation 55: secondary sprocket

57: Auxiliary Chain 61: Saddle

65: Cam 67: Cam Roller

71: saddle support 73: saddle rod

75: sleeve 77: operating rod

79: bracket 81: guide shaft

81a: first guide hole 81b: second guide hole

85: saddle height adjusting unit 91: sleeve knob

93: spring

Claims (8)

A bicycle having a front wheel steered by a handle, a rear wheel that is rotated by a rotational force of a pedal, and a frame that rotatably supports the front wheel and the rear wheel, A saddle disposed on an upper side of the frame; A pedal rotation shaft provided rotatably in the frame and rotating by the pedal; A rear wheel shaft spaced apart from the pedal rotation shaft and rotatably installed on the frame and on which the rear wheel is mounted; An auxiliary rotating shaft spaced apart from the rear wheel shaft and rotatably installed on the frame; A main power transmission unit interconnecting the pedal rotation shaft and the rear wheel shaft and transmitting the rotational force generated from the pedal rotation shaft to the rear wheel shaft; An auxiliary power transmission unit interconnecting the rear wheel shaft and the auxiliary rotation shaft and transmitting a rotational force generated from the rear wheel shaft to the auxiliary rotation shaft; A cam coupled to the auxiliary rotation shaft and having a predetermined camp profile on an outer circumference, a cam roller rolling and reciprocating in contact with the outer circumference of the cam, and the cam roller rotatably coupled to the saddle And having a saddle support for supporting a bicycle, characterized in that it comprises a motion conversion unit for lifting the saddle by converting the rotational movement of the auxiliary rotation axis into a linear reciprocating motion. The method of claim 1, The saddle support, A saddle rod supporting the saddle; A sleeve to which the saddle rod is liftably coupled; An actuating rod to which the cam roller is rotatably coupled; A bracket for interconnecting the working rod and the sleeve such that the sleeve moves up and down as the working rod moves up and down; And a first guide hole through which the operating rod penetrates and guides the lifting and lowering of the operating rod, and a second guide hole through which the sleeve penetrates and guides the raising and lowering of the sleeve, the guide shaft being supported by the frame. Bicycle. The method of claim 2, And a spring mounted to at least one of the sleeve and the working rod to cushion the impact load acting on the saddle. The method according to claim 2 or 3, The bicycle further comprises a saddle height adjustment for adjusting the height of the protrusion of the saddle rod relative to the sleeve. The method according to claim 2 or 3, And a sleeve knob to selectively lock and unlock the sleeve to the guide shaft such that the cam and the cam roller are in contact and spaced apart from each other. The method of claim 1, The main power transmission unit, A drive sprocket mounted to the pedal rotation shaft; One or more driven sprockets mounted to the rear wheel shaft; And a main chain interconnecting any one of the drive sprocket and the driven sprocket, and transmitting a rotational force generated from the pedal rotation shaft to the rear wheel shaft. The method of claim 6, The driven sprocket is made of a plurality, each of the driven sprockets, characterized in that having a different diameter from each other. The method of claim 1, The auxiliary power transmission unit, A pair of auxiliary sprockets mounted to the rear wheel shaft and the auxiliary rotation shaft, respectively; And an auxiliary chain connecting the pair of auxiliary sprockets to each other and transmitting the rotational force generated from the rear wheel shaft to the auxiliary rotating shaft.

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