Furthermore, this invention is composed in a way that the bicycle malfunction is prevented.

Description of the Prior Art: In general, bicycle, used as sports equipment or transportation medium, rotates crank gear by leveraging operation capability that is transmitted through pedal, and the bicycle is operated by transmitting to the rear wheel through the chain of the above mentioned crank gear's rotation capability.

At this moment, the above mentioned crank gear combines numerous sprockets that each have different number of saw teeth. Accordingly, effective navigation is enabled by enabling crank gear to change according to the state of road floor that includes level of inclination (slope).

Figure 1 is the side view of the typically structure bicycle that operates/moves rear wheel (230) by transmitting operation capability of crank gear (220) to the rear by

using chain (210). Bicycle (300) that is based on the above mentioned operation method is comprised of crank gear (220) where gears of different number of saw teeth are piled up onto the space between frontal wheel (240) and rear wheel (230) that is conjoined to enable rotation from the front and back part of the frame (250). The structure connects each crank (212) that is attached with the pedal (211) at the vertical hem when it comes to the both sides of the above mentioned crank gear (220)'s center part.

Along with this, recently, bicycle is made to increase the scope of conversion by increasing the Gear Ratio that can be selected by piling up the sprocket that each has different number of saw teeth when it comes to the follower gear (221) of rear wheel (230) that is connected to the chain (210).

Meanwhile, chain (210), connected to the crank gear (220) and follower gear (221) of rear wheel (230), can countermeasure to the change in the distance between crank gear (220) and follower gear (221) in an elastic manner, and power transmission for long distance is made possible. On the other hand, effect decreases since the state in which the lower part is relaxed needs to be maintained due to the characteristics of the chain (210) during the process of power transmission. Accordingly, consumption of human power increases and other problems rise.

Moreover, usage is inconvenient since chain (210) separates easily from the crank gear (220) and follower gear (221) during its use. At the same time, problems such as limited lifetime etc. result.

SUMMARY OF THE INVENTION This invention relates to the device for bicycle operation. This invention is

comprised of; crank gear assembly entity (10) where numerous bevel gears are conjoined into concentricity; idler (20) that rotates operation axis (60) by being interlocked with the above mentioned crank gear assembly entity (10) ; pressurizing supplementary material (30) that recovers bevel gear of crank gear assembly entity (10) ; follower bevel gear (50) that rotates with hub (101) in a single unit by being attached on the one side of the hub (101) that is conjoined at the center part of the rear wheel (110); and conversion lever (70) that interlocks with bevel gear of crank gear assembly entity (10) with idler (20) in a selective manner.

Likewise, this invention enables effective power transmission, which prevents loss of human power and ensures effective navigation of bicycle. Moreover, this invention may prevent malfunction during long time use.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is the side view of typically structured bicycle.

Figure 2 is the plane view of this invention.

Figure 3 is the frontal view of this invention's principal part.

Figure 4 is the side view of the bicycle that applies this invention.

Figure 5a and Figure 5b are plane view that depicts the reaction of this invention.

<Explanation of Symbols that Relate to the Key Parts of Figure > 1 : bevel gear 1 2 : bevel gear 2 3 : bevel gear 3 4 : bevel gear 4 5 : bevel gear 5 10 : crank gear assembly entity 11,12, 13,14, 15: bevel gear 20 : idler

21: plate spring 30: pressurizing supplementary material 40: housing 50: follower bevel gear 60 : operation axis 61,62, 63,64, 65: pressurizing ball 70: conversion lever 90: crank axis 110: rear wheel DETAILED DESCRIPTION This invention was invented to solve the above mentioned problems. Technical initiative of this invention is to make operation of bicycle effective, prevent malfunction and to provide the medium for long-term use by transmitting operation capability of crank gear assembly entity to the rear wheel by using operation axis, which in turn increases the effect of power transmission.

Technical initiatives of this invention as mentioned above are realized by the following composition of this invention; crank gear assembly entity that is conjoined to enable movement of numerous bevel gears that are aligned in concentricity into the axis direction by leveraging outer surface of round circle of crank axis ; idler that rotates as single unit according to the contact with one of the bevel gears of crank gear assembly entity by piling up the bevel gear that interlocking each with bevel gear of the above mentioned crank gear assembly entity in a consecutive manner; pressurizing supplementary material that aligns each plate spring that pressurizes the above mentioned bevel gear 1, bevel gear 2, bevel gear 3, bevel gear 4 and bevel gear 5 that is projected outward into the axis direction by being attached closely to each of bevel

gear 1, bevel gear 2, bevel gear 3, bevel gear 4 and bevel gear 5 of the above mentioned crank gear assembly entity into circular form; housing that provides necessary support to enable rotation of crank axis and idler by being conjoined with the outside of the above mentioned crank gear assembly entity and idler and pressurizing supplementary material; follower bevel gear that rotates with hub as single unit by being attached at one side of the hub that is conjoined at the center part of the rear wheel; operation axis that transmits operation capability of crank gear assembly entity that is transmitted through the idler into the follower bevel gear based on the use of bevel gear that is formed at both sides of vertical hem by being conjoined between the above mentioned idler and follower bevel gear; and conversion lever that is each inserted into spiral shape from the both sides of outer surface of round circle when it comes to the pressurizing ball that pressurizes both sides of each bevel gear's rear part related to the crank gear assembly entity by being supported in a way that each rotation is enabled at the both sides based on the use of housing.

Hereafter, device for bicycle operation according to this invention is explained in detail by using attached figures.

Composition and Reaction of the Invention Figure 2 is the plane view of this invention. Figure 3 is the frontal view of this invention's principal part. Figure 4 is the side view of the bicycle that applies this invention. Device for bicycle operation (100) in accordance to this invention is comprised of ; crank gear assembly entity (l0) where numerous bevel gears of different diameter is

lined up in the form of concentric circle, idler (20) that rotates along with the crank gear assembly entity (l0) by being interlocked with the above mentioned crank gear assembly entity (l0), pressurizing supplementary material (30) that returns each bevel gear of crank gear assembly entity (l0) to the initial location, housing (40) that is conjoined with the outside of the pressurizing supplementary material (30), and the above mentioned crank gear assembly entity (l0) and idler (20), follower bevel gear (50) that is attached at the hub of the rear wheel, and operation axis (60) and conversion lever (70) that is conjoined between crank gear assembly entity (l0) and follower bevel gear (50).

When it comes to the above mentioned crank gear assembly entity (l0), bevel gear 2 (2) is conjoined with the outer surface of round circle of bevel gear 1 (1) that rotates based on the operation of crank axis (90). Bevel gear 3 (3) is conjoined into outer surface of round circle of the above mentioned bevel gear 2 (2), and bevel gear 4 (4) and bevel gear 5 (5) are conjoined into the outer surface of round circle of the above mentioned bevel gear 3 (3) in a consecutive manner.

At this time, each spline, S is formed when it comes to the outer surface of round circle of each bevel gear. Each spline, S groove (H) is formed at inner surface of round circle of bevel gear 1 (1), bevel gear 2 (2), bevel gear 3 (3), bevel gear 4 (4) and bevel gear 5 (5). When it comes to bevel gear 1 (1), bevel gear 2 (2), bevel gear 3 (3), bevel gear 4 (4) and bevel gear 5 (5), appearing and disappearing is possible towards the front from crank axis (90), or nearby gear. Meanwhile, rotation takes place in single unit at the time of rotation.

Along with this, the above mentioned crank gear assembly entity (l0) is

interlocked with idler (20) that is piles up the bevel gear (11, 12, 13,14, 15) that is interlocked each with bevel gear 1 (1), bevel gear 2 (2), bevel gear 3 (3), bevel gear 4 (4) and bevel gear 5 (5) in a consecutive manner. As such, rotation of idler (20) takes place during the process of rotating crank gear assembly entity (l0) based on the rotation capability that is transmitted through crank axis (90).

At this moment, saw-toothed wheel that is in proportion with the diameter is formed at the bevel gear 1 (1), bevel gear 2 (2), bevel gear 3 (3), bevel gear 4 (4) and bevel gear 5 (5).

Thus, number of saw teeth increases in a consecutive manner. Thus, different number of rotation is assumed according to the location of each bevel gear's contact when it comes to the idler (20) that is interlocked with the crank gear assembly entity (l 0).

In other words, an example is when the lowest number of rotation is assumed for the 1 rotation of crank axis (90) at a state when the idler (20) is interlocked with bevel gear 1 (1). On the other hand, the largest number of rotations is assumed at the state when the bevel gear 5 (5) is interlocked.

Along with this, idler (20) assumes lowest rotation capability at the state when interlocked with bevel gear 5 (5). On the other hand, rotation capability increases in a consecutive manner during the process of interlocking with the bevel gear 4 (4), bevel gear 3 (3), bevel gear 2 (2) and bevel gear 1 (1), which assumes largest rotation capability during the process of interlocking with bevel gear 1 (1).

Next, pressurizing supplementary material (30) that returns bevel gear 1 (1), bevel gear 2 (2), bevel gear 3 (3), bevel gear 4 (4) and bevel gear 5 (5) projected out towards the axis direction to the original location comes into contact with each of the bevel gear 1 (1),

bevel gear 2 (2), bevel gear 3 (3), bevel gear 4 (4) and bevel gear 5 (5), and is conjoined with the pressurizing supplementary material (30) that pressurizes based on the elasticity of plate spring (21) that lines the above mentioned bevel gear 1 (1), bevel gear 2 (2), bevel gear 3 (3), bevel gear 4 (4) and bevel gear 5 (5) into circular form.

At this moment, the above mentioned plate spring (21) of pressurizing supplementary material (30) is placed in multiple to the left and right in a symmetry so that both sides of bevel gear 1 (1), bevel gear 2 (2), bevel gear 3 (3), bevel gear 4 (4) and bevel gear 5 (5) can be pressured each to enable effective pressuring of each bevel gear. In particular, contact part of the bevel gear 1 (1), bevel gear 2 (2), bevel gear 3 (3), bevel gear 4 (4) and bevel gear 5 (5) is limited to main wheel lower part where gear is not formed.

As such, resistance to rotation and noise are minimized due to excessive friction with bevel gear 1 (1), bevel gear 2 (2), bevel gear 3 (3), bevel gear 4 (4) and bevel gear 5 (5).

Next, crank gear assembly entity (10) and idler (20) are supported at the above mentioned crank gear assembly entity (l0) and idler (20) and outside of pressurizing supplementary material (30). Space for the installation of pressurizing supplementary material (30) is provided. At the same time, housing (40) where lubricant is stored through the space at the lower part is conjoined. Conversion lever (70) is conjoined to the horizontal towards one side.

The above mentioned conversion lever (70) pressures bevel gear 1 (1), bevel gear 2 (2), bevel gear 3 (3), bevel gear 4 (4) and bevel gear 5 (5) selectively along the rotation angle to move to the axis direction. As such, it interlocks with one of the idler (20) 's bevel gear (l 1, 12,13, 14,15). Meanwhile, rotation of idler (20) is enabled. Pressurizing

ball (61,62, 63,64, 65) that pressures bevel gear 1 (1), bevel gear 2 (2), bevel gear 3 (3), bevel gear 4 (4) and bevel gear 5 (5) is each inserted in the shape of spiral.

At this moment, the above mentioned pressurizing ball (61,62, 63,64, 65) is conjoined at the state of symmetry from both sides of outer surface of round circle. At the center part of conversion lever (70), curve part (70A) is formed to prevent intervention according to the contact with the crank axis (90) during the process of changing angle.

Along with this, numerous balls (66) are lined up in a consecutive manner to enable rotation when it comes to the nearby part of each pressurizing ball (61,62, 63,64, 65).

As such, friction based on the contact with bevel gear 1 (1), bevel gear 2 (2), bevel gear 3 (3), bevel gear 4 (4) and bevel gear 5 (5) is prevented. Meanwhile, effective rotation of bevel gear 1 (1), bevel gear 2 (2), bevel gear 3 (3), bevel gear 4 (4) and bevel gear 5 (5) is enabled as result.

Next, the above mentioned hub (101) is operated to the one side of hub (101) that is conjoined to the central part of rear wheel, and follower bevel gear (50) of bevel gear form is attached to enable rotation of rear wheel. One side of operation axis (60) 's vertical hem is connected to the above mentioned follower bevel gear (50).

The above mentioned operation axis (60) is conjoined between follower bevel gear (50) and idler (20) to transmit operation capability of crank gear assembly entity (10) that is transmitted through idler (20) to the follower bevel gear (50) to rotate rear wheel.

Bevel gear (51,52) that interlocks with idler (20) and follower bevel gear (50) is formed at both sides.

Meanwhile, this actual example comprises bevel gear of crank gear assembly

entity (10) into bevel gear 1 (1), bevel gear 2 (2), bevel gear 3 (3), bevel gear 4 (4) and bevel gear 5 (5). Idler (20) that comes into direct contact with the above mentioned bevel gear 1 (1), bevel gear 2 (2), bevel gear 3 (3), bevel gear 4 (4) and bevel gear 5 (5) is comprised of five bevel gears (l 1, 12,13, 14,15). Along with this, conjoining of five pressurizing balls (61,62, 63,64, 65) onto outer surface of round circle of conversion lever (70) was presented as an example, but this invention is not limited to the above mentioned.

According to the type of bicycle that is applied, quantity of each bevel gear and pressurizing ball is added or subtracted to compose with an operation device that offers three or eight tiered conversion gear.

Among the figures, non explained symbol B is the bearing, and symbol 70A is a marking symbol that is formed on the surface of conversion lever (70) to enable discernment of gear's tier that is interlocked.

Reaction and effect of this invention, comprised as mentioned above, is explained in the following.

Device for bicycle operation (100) in accordance to this invention is installed at the lower part of the frame (130) that is situated between the frontal wheel (l 10) and rear wheel (120), and crank axis (90) is rotated based on the human power that is transmitted through pedal and crank. Navigation is enabled as the rotation capability of the above mentioned crank axis (90) is transmitted to the rear wheel (l 10).

This type of invention advances bevel gear of crank gear assembly entity (l0) 3 (3) towards the axis direction when at the navigation state, and navigation at the state when the number of rotation and rotation capability is maintained at the interim stage is enabled

by interlocking bevel gear (13) of middle location among idler (20) 's bevel gear (l 1, 12,13, 14,15) when it comes to the above mentioned bevel gear 3 (3).

During this process, to ensure navigation on the floor of the road with steep inclination (slope), rotation to the first level conversion is conducted against conversion lever (70) as shown on Figure 5a if and when considerable rotation capability is needed.

Accordingly, pressurizing ball (61) among the pressurizing balls (61,62, 63,64, 65) conjoined to the outer surface of round circle that is nearby center part of conversion lever (70) is rotated to the horizontal state rotation. Meanwhile, the above mentioned pressurizing ball (61) needs to projected outwards to the frontal part.

As mentioned above, if and when pressurizing ball (61) near the central part is situated horizontally, bevel gear 1 (1) that is directly connected to the crank axis (90) among the bevel gear of crank gear assembly entity (10) 1 (1), bevel gear 2 (2), bevel gear 3 (3), bevel gear 4 (4) and bevel gear 5 (5) is pressured towards the frontal part.

Accordingly, bevel gear 1 (1) is interlocked with the bevel gear (l 1) situated at the vertical hem of idler (20), and rotates operation axis (60) at a low speed based on powerful rotation capability. When it comes to the above mentioned operation axis (60), follower bevel gear (50) attached onto the hub (101) based on the bevel gear (52) formed at the other gear tier is rotated. As such, operation of rear wheel (l 10) takes place.

During this process, if and when navigation is desired in high speed by navigating on smooth road floor, conversion lever (70) is rotated consecutively into the same direction as the process above mentioned to convert into applicable gear tier. An example is that the pressurizing ball (61) situated at the vertical hem among pressurizing

balls (61,62, 63,64, 65) that is conjoined onto the above mentioned outer surface of round circle of conversion lever (70) assumes a state in which projection to the frontal part takes place by maintaining horizontal state if and when the conversion lever (70) is rotated to the 5 tier conversion location.

Next as mentioned above, when the pressurizing ball (61) of both directions is situated to the horizontal, the bevel gear 5 (5) that has largest number of saw teeth among bevel gear of crank gear assembly entity (10) 1 (1), bevel gear 2 (2), bevel gear 3 (3), bevel gear 4 (4) and bevel gear 5 (5) is pressured starting from the rear to move to the front part.

Accordingly, the above mentioned bevel gear 5 (5) is closely attached to the bear gear (15) of the idler (20).

Meanwhile, bevel gear 1 (1), bevel gear 2 (2), bevel gear 3 (3) and bevel gear 4 (4) that is not transmitted with pressurizing power from the rear during this process maintains a state of separation with idler (20) when it comes to bevel gear 1 (1), bevel gear 2 (2), bevel gear 3 (3) and bevel gear 4 (4) except for bevel gear 5 (5) due to the fact that projection towards the front does not take place due to the elasticity of plate spring (21) attached onto pressurizing supplementary material (30).

Accordingly, bevel gear 5 (5) is interlocked with bevel gear (15) situated at the foremost outer part of idler (20), and rotates operation axis (60) at a high speed through the bevel gear (51) of vertical hem. The above mentioned operation axis (60) rotates follower bevel gear (50) attached onto hub (101) with increased speed by leveraging bevel gear (52) that is formed at the other gear tier. As such, operation of rear wheel (l 10) takes place.

Next, if and when return to the typical state is desired according to the

completion of the above mentioned process, conversion lever (70) is converted to applicable gear tier as in the case of the above mentioned process. Accordingly, selective gear conversion of bicycle (200) according to the road floor or navigation speed is enabled. This type of invention is transmitted with power through operation axis (60).

As such, power transmission is realized effectively on the navigation process of bicycle (200). Along with this, power transmission system is simple, which prevents malfunction even when used for a long time