KR101558844B1 - Bicycle for forward and reverse direction - Google Patents

Bicycle for forward and reverse direction Download PDF

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Publication number
KR101558844B1
KR101558844B1 KR1020150070998A KR20150070998A KR101558844B1 KR 101558844 B1 KR101558844 B1 KR 101558844B1 KR 1020150070998 A KR1020150070998 A KR 1020150070998A KR 20150070998 A KR20150070998 A KR 20150070998A KR 101558844 B1 KR101558844 B1 KR 101558844B1
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KR
South Korea
Prior art keywords
crank arm
pedal
bolt
bicycle
coupled
Prior art date
Application number
KR1020150070998A
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Korean (ko)
Inventor
허현강
김지호
Original Assignee
허현강
김지호
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Publication date
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Priority to KR1020150070998A priority Critical patent/KR101558844B1/en
Application granted granted Critical
Publication of KR101558844B1 publication Critical patent/KR101558844B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M3/00—Construction of cranks operated by hand or foot
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M3/00—Construction of cranks operated by hand or foot
    • B62M3/08—Pedals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M9/00—Transmissions characterised by use of an endless chain, belt, or the like
    • B62M9/02—Transmissions characterised by use of an endless chain, belt, or the like of unchangeable ratio

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)

Abstract

According to the present invention, provided is a bicycle which includes a pedal coupled to a first end of a crank arm, and a power shaft connected to a second end of the crank arm wherein the bicycle goes forward by both a forward rotation and a reverse rotation of the crank arm. The bicycle also comprises: a bolt coupled to a screw hole formed on the first end of the crank arm by being extended through the pedal; and a snap ring preventing the bolt from being separated from the first end of the crank arm by being coupled to the end of the bolt on an opposite side to a side to which the pedal is coupled among the sides of the crank arm.

Description

Bicycle for forward and reverse direction

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a bicycle, and more particularly to a bicycle capable of forward driving of the bicycle regardless of the direction of rotation of the pedal.

Generally, the bicycle is capable of obtaining a forward driving force when the pedal is rotated in the first direction, while advancing when the pedal is rotated in the second direction opposite to the first direction or when the pedal is not being rotated So that the driving force can not be obtained. This is because the operation of the ratchet sprocket provided on the rear wheel of the bicycle blocks power transmitted through the chain from being transmitted to the rear wheel when the user rotates the pedal in the second direction.

The above-described general bicycle requires that the pedal is rotated in the first direction so that the bicycle is driven forward, so that only the user's specific muscles are used. Therefore, the muscles used while riding the bicycle are easily fatigued, while the unused muscles can not obtain the effect of exercise.

In order to solve the above problem, the present applicant has proposed a bicycle capable of forward driving of the bicycle regardless of the rotational direction of the pedal in the Utility Model Registration No. 20-0267654.

1 to 3 show the configuration of a bicycle disclosed in the utility model registration.

Referring to the drawings, a pedal 20 and a power sprocket 21 are disclosed. When the user presses the pedal 20, the power sprocket 21 rotates and power is transmitted through the chain. A drive shaft 30 is installed at the center of a rear wheel and a reverse drive sprocket 31 and a forward drive sprocket 32 are mounted on the drive shaft 30 in the reverse direction.

The rear rotation shaft 50 is provided with a rear guide sprocket 51 and an auxiliary guide sprocket 52. The auxiliary guide sprocket 52 is connected to the forward drive sprocket 32 by a separate auxiliary chain 70. [ And the rear guide sprocket 51 is connected to the lower guide sprocket 61 and the reverse drive sprocket 31 by the drive chain 22.

The drive shaft 30 and the rear rotary shaft 50 are interconnected and supported by separate brackets 40 as shown in FIGS. The support base 34 is bolted to the lower end of the connection link 33 and the support base 34 is elastically biased in one direction by a coil type spring 36 interposed between the support base 34 and the connection link 33 do. A lower pivot shaft 60 is provided at the end of the support stand 34 and a lower guide sprocket 61 is provided at the lower pivot shaft.

1, the drive chain 22 is wound on the power guide sprocket 21 and then wound on the rear guide sprocket 51. The drive chain 22 is wound on the upper side of the reverse drive sprocket 31 through the lower guide sprocket 61, Lt; / RTI > On the other hand, the auxiliary chain 70 is wound on the auxiliary guide sprocket 52 and the forward drive sprocket 32.

When the user rotates the pedal 20 in the forward direction, the drive chain 22 moves to the right side in the drawing, thereby moving the rear guide sprocket 51 and the lower guide sprocket 61 rotate clockwise, and the reverse drive sprocket 31 rotates counterclockwise. At this time, since the reverse drive sprocket 31 idles in the counterclockwise direction, the force can not be transmitted to the drive shaft 30.

On the other hand, since the rear guide sprocket 51 rotates clockwise, the auxiliary guide sprocket 52 rotates in the clockwise direction, whereby the force is transmitted to the drive shaft 30 to advance the bicycle.

On the other hand, when the user rotates the pedal 20 in the reverse direction, the drive chain 22 moves to the left in the drawing, whereby the rear guide sprocket 51 and the lower guide sprocket 61 are rotated counterclockwise The reverse sprocket 31 rotates in the clockwise direction, so that the rotational force of the reverse drive sprocket 31 is transmitted to the drive shaft 30 as it is, thereby advancing the bicycle.

The bicycle described above with reference to Figs. 1 to 3 rotates the pedal not only in the forward direction but also in the reverse direction, so that the pedal is separated from the crank arm. That is, the pedal is fixed to the crank arm through the bolt. When the pedal is rotated in the normal direction, the bolt receives force in the direction of tightening the thread formed on the crank arm or the thread formed on the separate nut, The bolt receives a force in the direction of unwinding from the thread of the crank arm or nut. Therefore, when the pedal fixing bolt is released from the crank arm, the pedal separates from the crank arm, which may lead to an accident during running of the bicycle.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a bicycle capable of preventing separation of a pedal and a crank arm.

Another object of the present invention is to provide a bicycle in which the overall thickness of the sprocket is reduced so that the alignment between the front wheel and the rear wheel can be improved.

In order to achieve the above object, according to the present invention,

A bicycle comprising a pedal coupled to a first end of a crank arm and a power shaft coupled to a second end of the crank arm, the advance being achieved by both forward and reverse rotation of the crank arm,

A bolt extending through the pedal and fastened to a screw hole formed at a first end of the crank arm; And

And a snap ring coupled to an end of the bolt at an opposite side of the side of the crank arm to which the pedal is engaged to prevent the bolt from being disengaged from the first end of the crank arm / RTI >

According to one aspect of the present invention,

A protrusion formed at a second end of the crank arm is inserted into a coupling hole formed in the power shaft,

A hanger nut inserted into a coupling hole of the power shaft in a state of wrapping the protrusion; And

And a stop ring disposed at an inner circumferential surface of the engaging hole at a position adjacent to an inlet of the engaging hole than a hanger nut inserted into the engaging hole of the power shaft to prevent the hanger nut from being separated from the engaging hole.

In the bicycle according to the invention, the coupling between the pedal and the crank arm and the coupling between the crank arm and the power shaft are firmly ensured not only in the forward rotation but also in the reverse rotation. Therefore, the risk that the pedal is separated from the crank arm is prevented even when the user rotates the pedal in the normal direction as well as in the reverse direction. The bicycle according to the present invention can improve safety in use and improve durability.

Figs. 1 to 3 schematically show the configuration of a bicycle disclosed in the prior utility model registration application of the present applicant.
4 is a schematic exploded perspective view showing a coupling structure of a pedal and a crank arm provided on a bicycle according to the present invention.

Hereinafter, the present invention will be described in more detail with reference to the embodiments shown in the drawings.

4 is a schematic exploded perspective view showing a coupling structure of a pedal and a crank arm provided on a bicycle according to the present invention.

Referring to the drawings, a pedal 120 is coupled to a first end of a crank arm 110. [ In order to engage the pedal 120, a hole 112 is formed in the first end of the crank arm 110 and a bearing 124 is coupled to the inside of the pedal 120. The bolt 126 extends through the hole 122 formed in the bearing 124 and the end of the bolt 126 is inserted into the hole 112 of the crank arm 110 and fastened. The bolt 126 is formed with a screw 126a which can be engaged with a screw formed on the inner surface of the hole 112 of the crank arm 110. [

According to one aspect of the present invention, a screw 126a is provided at the end of the bolt 126 in order to prevent the bolt 126 from being loosened from the corresponding screw formed in the hole 112 of the crank arm 110 by vibration. A snap ring 150 is provided. The snap ring 150 is coupled to the end of the bolt 126 at the opposite side of the side of the crank arm 110 where the pedal 120 is engaged. Therefore, when a force to escape from the hole 112 of the crank arm 110 acts on the bolt 126, the snap ring 150 serves to resist such force.

The snap ring 150 is formed in an annular shape with one end being open as a whole as shown in the drawing. The snap ring 150 has a resilient property. The snap ring 150 can be resiliently fixed to the end of the bolt 126 by engaging the end of the bolt 126 with the diameter of the bolt 126 by spreading the snap ring 150 using a tool and removing the tool have. That is, the snap ring 150 is resiliently fixed to the outer surface of the end portion of the bolt 126 in a state where the bolt 126 is inserted into the hole 112 of the crank arm 110, (150) engages the end of the bolt (126), thereby eliminating the possibility that the bolt (126) can escape from the hole (112) of the crank arm (110).

On the other hand, at least a part of the snap ring 150 is accommodated in a snap ring groove (not shown) formed in the hole 112 of the crank arm 110. The snap ring groove is formed such that a part of the hole 112 of the crank arm 110 corresponds to the shape of the snap ring 150. The snap ring 150 resists such force when it is seated in the snap ring groove and when the bolt 126 is pressed against the crank arm 110 in the longitudinal direction of the bolt, The phenomenon of being detached from the arm 110 can be prevented. As a result, separation between the pedal 120 and the crank arm 110 due to disengagement of the bolt 126 can be prevented.

A protrusion 115 is formed at a first end of the crank arm 110 and the protrusion 115 is inserted into an engaging hole 205 formed in the power shaft 200, . The power shaft 200 is, for example, a shaft to which the power sprocket 21 shown in FIG. 1 is coupled and rotated. At this time, at least a part of the outer surface of the projection 115 is wrapped by the hanger nut 180. That is, the protrusion 115 is inserted into the hanger nut 180. A screw may be formed on the outer surface and the inner surface of the hanger nut 180 and a screw formed on the hanger nut 180 may be fastened to the corresponding screw formed on the projection 115 and the engagement hole 205 .

In order to prevent the hanger nut 180 from escaping from the engagement hole 205 of the power shaft 200 at a position outside the hanger nut 180 inserted in the engagement hole 205, The detent ring 170 is disposed inside the recess 205. As a result, the stop ring 170 surrounds the projection 115 and is disposed on the inner peripheral surface of the engagement hole 205 at a position adjacent to the entrance of the engagement hole 205.

It is preferable to form the stop ring groove 210 on the inner circumferential surface of the inlet of the engaging hole 205 so that the stop ring 170 can be held in the engaging hole 205 at a predetermined position. The stop ring groove 210 is formed to correspond to the shape of the stop ring 170.

It is preferable that the stop ring 170 has an annular shape in which a part of the circumference is opened as shown in the drawing, and has a characteristic of elastic flaring. The stop ring 170 can be positively positioned in the stop ring groove 210 by removing the tool after positioning the stop ring 170 with the tool in the engagement hole 205. [

The vibration of the bicycle or the rotation of the crank arm 110 may cause the hanger nut 180 to escape to the engagement hole 205 by the stop ring 170. [ That is, since the stop ring 170 is disposed adjacent to the entrance of the engagement hole 205 formed in the power shaft 200 rather than the hanger nut 180, the phenomenon in which the hanger nut 180 exits from the engagement hole 205 Can be suppressed by the stop ring 170. [

110. Crank arm 120. Pedal
126. Bolt 150. Snap ring

Claims (2)

A bicycle comprising a pedal coupled to a first end of a crank arm and a power shaft coupled to a second end of the crank arm, the advance being accomplished by both forward and reverse rotation of the crank arm,
A bolt extending through the pedal and fastened to a screw hole formed at a first end of the crank arm;
A snap ring engaged with an end of the bolt at an opposite side of the side of the crank arm to which the pedal is coupled to prevent the bolt from being disengaged from the first end of the crank arm;
A hanger nut inserted into a coupling hole of the power shaft when the protrusion formed at the second end of the crank arm is inserted into the coupling hole formed in the power shaft while the protrusion is being wrapped; And
And a stop ring disposed at an inner circumferential surface of the engaging hole at a position adjacent to an inlet of the engaging hole than the hanger nut inserted into the engaging hole of the power shaft, thereby preventing the hanger nut from being separated from the engaging hole. . delete
KR1020150070998A 2015-05-21 2015-05-21 Bicycle for forward and reverse direction KR101558844B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150070998A KR101558844B1 (en) 2015-05-21 2015-05-21 Bicycle for forward and reverse direction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150070998A KR101558844B1 (en) 2015-05-21 2015-05-21 Bicycle for forward and reverse direction

Publications (1)

Publication Number Publication Date
KR101558844B1 true KR101558844B1 (en) 2015-10-08

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ID=54346747

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150070998A KR101558844B1 (en) 2015-05-21 2015-05-21 Bicycle for forward and reverse direction

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200267654Y1 (en) * 2001-12-12 2002-03-12 허현강 Bycycle
JP2013521175A (en) * 2010-03-05 2013-06-10 大行科技（深▲セン▼）有限公司 Quickly removable pedal device without the need for tools

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200267654Y1 (en) * 2001-12-12 2002-03-12 허현강 Bycycle
JP2013521175A (en) * 2010-03-05 2013-06-10 大行科技（深▲セン▼）有限公司 Quickly removable pedal device without the need for tools

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