TWM546945U - Bicycle crank extender - Google Patents

Description

Bicycle crank extender

This creation is about bicycle transmissions, especially a bendable bicycle crank extender.

The crank of the conventional bicycle is a fixed length rod for connecting the pedal and the spindle of the bicycle. During the operation, the bicycle is stepped on the pedal by the user, and the pedal is rotated with the spindle as the center of rotation. The circular motion with the radius of the crank is used to drive the driving device of the bicycle such as the gear plate and the chain to advance the bicycle.

Existing labor-saving devices for bicycles generally have an extension rod between the crank and the pedal to extend the crank and thereby increase the length of the arm, and can reduce the force required for the pedaling. Generally, the length of the extension rod does not touch the ground. Limited, but when the bicycle turns, its front wheel deflection may cause the extension rod to collide. Especially when applied to road vehicles, the distance between the end of the crank and the front wheel is relatively small due to the large diameter of the road wheel. When the bicycle is turned, the extension rod must be deflected by the front wheel.

In view of this, the creator has focused on the above-mentioned prior art, and has devoted himself to researching and cooperating with the use of academics to try to solve the above problems, which is the goal of the creator's improvement.

This creation provides a bicycle crank extender that can be bent.

The present invention provides a bicycle crank extender that includes a first link and a second link. The first link includes a transmission arm and a first swing arm. One end of the transmission arm is pivotally connected to one end of the first swing arm and a first limiting structure is disposed on the transmission arm. The second link includes a force applying arm and a second swing arm. One end of the force applying arm is pivotally connected to one end of the second swing arm and a second limiting structure is disposed on the force applying arm, and the other end of the first swing arm is pivoted Connected to the other end of the second swing arm, the transmission arm and the force applying arm are parallel to each other, the first swing arm and the second swing arm are arranged side by side, and the first limiting structure is movably connected to the second limiting structure to apply the force arm Maintain a fixed distance from the drive arm and be able to translate relative to each other.

The bicycle crank extender of the present invention has a first limit structure which is a limit pin protruding from the force applying arm to the transmission arm, and a second limit structure is a slot extending through the force applying arm, the limit pin One end of the fixing arm is fixed to the transmission arm, and the limiting pin passes through one side of the sliding slot and is slidable along the sliding slot. The other end of the limiting pin is provided with a stopping portion, and the stopping portion abuts against the sliding slot. One side. The chute extends along a non-linear line.

The bicycle crank extender of the present invention has a first limit structure which is a chute extending through the transmission arm, and a second limit structure is a limit pin protruding from the force applying arm toward the transmission arm, and the limit pin is One end is fixed to the force applying arm, and the limiting pin passes through one side of the sliding slot and is slidable along the sliding slot. The other end of the limiting pin is provided with a stopping portion, and the stopping portion abuts against the sliding slot. One side. The chute extends along a non-linear line.

In the bicycle crank extender of the present invention, an elastic returning element is connected between the first link and the second link. The elastic returning elements are respectively connected to the transmission arm and the force applying arm. The connection of the resilient return element to the drive arm and the force applying arm is spaced along the longitudinal direction of the drive arm and the force arm.

The bicycle crank extender of the present invention has a pedal pivoted on the other end of the urging arm, and the pivoting axis of the pedal is perpendicular to the pivoting axis of the first swing arm relative to the transmission arm and the second swing arm is opposite to the urging force The pivoting axis of the arm. The other end of the transmission arm is for pivoting a crank, and the pivotal axis of the crank with respect to the transmission arm is parallel to the pivotal axis of the pedal.

The bicycle crank extender of the present invention has a first swing arm parallel to the pivot axis of the transmission arm and a pivot axis of the second swing arm relative to the force applying arm. The transmission arm is curved in an arc. The first swing arm is curved in an arc shape. The urging arm is curved in an arc shape. The second swing arm is curved in an arc shape. The transmission arm is continuous with the curvature of the first swing arm. The urging arm is continuous with the curvature of the second swing arm. Both the transmission arm and the first swing arm are curved in an arc shape and have the same bending direction. Both the urging arm and the second swing arm are curved in an arc and have the same bending direction.

The bicycle crank extender of the present invention extends the length of the crank by the bendable first link and the second link to reduce the required force applied to the pedaling, and when the bicycle is turned, the first link and the second link are bent. Fold off the front wheel of the deflection to ensure that the bicycle case can still be smoothly turned after the bicycle crank extender of the creation.

Referring to Figures 1 through 2, a preferred embodiment of the present invention provides a bicycle crank extender that includes a first link 100 and a second link 200 that are disposed next to each other and that are pivotally coupled to each other. The first link 100 includes a transmission arm 110 and a first swing arm 120. One end of the transmission arm 110 is pivotally connected to one end of the first swing arm 120, and the transmission arm 110 is provided with a first fixing base 111 and a first limit. Structure 310. The second link 200 includes a biasing arm 210 and a second swing arm 220. One end of the second link 200 is pivotally connected to one end of the second swing arm 220, and the second link 200 is provided with a second fixing seat 211. A second limit structure 320.

The other end of the first swing arm 120 is pivotally connected to the other end of the second swing arm 220. The transmission arm 110 and the second link 200 are parallel to each other, and the first swing arm 120 and the second swing arm 220 are arranged side by side, and are initially In the state, the first swing arm 120 and the second swing arm 220 are arranged in parallel with each other. The first limiting structure 310 is movably connected to the second limiting structure 320 to maintain the second connecting rod 200 and the transmission arm 110 at a fixed distance and can Relative translation.

The first limiting structure 310 is a limiting pin 311 protruding from the second connecting rod 200 to the second connecting rod 200. The second limiting structure 320 is a slot 321 extending through the second connecting rod 200. One end of the 311 is fixed to the transmission arm 110 , and the limiting pin 311 passes through one side of the sliding slot 321 to pass through the sliding slot 321 and can slide along the sliding slot 321 . The other end of the limiting pin 311 is provided with a stopping portion 312 which abuts the opposite side of the sliding groove 321 to position the end in the sliding groove 321 , thereby causing the transmission arm 110 and the biasing arm 120 Maintain a fixed spacing. When the first link 100 and the second link 200 move relative to each other, the limit pin 311 is displaced, and the moving path of the engaging pin 311 of the sliding slot 321 extends, and the outer diameter of the limiting pin 311 is smaller than the inner diameter of the sliding slot 321 Therefore, when the limit pin 311 does not contact the inner wall of the sliding groove 321 when the limit pin 311 moves in the sliding groove 321, the stepping force of the biasing arm 210 can be prevented from being directly applied to the transmission arm 110 to change the pedaling moment.

The foregoing is a preferred embodiment of the first limiting structure 310 and the second limiting structure 320, but the present invention is not limited thereto, and the components of the first limiting structure 310 and the second limiting structure 320 may also be mutually adjusted, for example, The first limiting structure 310 is a slot 321 extending through the transmission arm 110 , and the second limiting structure 320 is a limiting pin 311 protruding from the second arm 200 toward the transmission arm 110 , and the limiting pin 311 is One end of the second connecting rod 200 is fixed to the second connecting rod 200. The limiting pin 311 passes through the sliding slot 321 and can slide along the sliding slot 321 . The other end of the limiting pin 311 is provided with a stopping portion 312. The portion 312 abuts the opposite side of the chute 321 to position the end within the chute 321, thereby maintaining the transmission arm 110 at a fixed distance from the force arm 120.

An elastic restoring element 400 is connected between the first connecting rod 100 and the second connecting rod 200. In the present embodiment, the elastic restoring element 400 is preferably a cylindrical spring, but the present invention is not limited thereto. The two ends of the elastic restoring element 400 are respectively hooked between the first fixing base 111 and the second fixing base 211 and connected between the transmission arm 110 and the second connecting rod 200, and the elastic returning element 400 and the transmission arm 110 and the second connecting rod The connection of 200 has a spacing along the longitudinal direction of the transmission arm 110 and the second link 200 so that the reset can be initiated by the resilient return element 400 after the transmission arm 110 and the second link 200 are relatively translated. In the present embodiment, since the first link 100 and the second link 200 are arranged next to each other, there is not enough space between the transmission arm 110 and the second link 200 to set the elastic reset element 400, so the first fixing base 111 and The second fixing base 211 preferably extends from one side edge of the transmission arm 110 and the second connecting rod 200 respectively, and the elastic returning element 400 is disposed on one side of the transmission arm 110 or the second connecting rod 200.

Referring to FIGS. 3 to 4, the bicycle crank extender of the present invention is disposed between the crank 10 of the bicycle 1 and the pedal 20 to extend the crank 10 of the bicycle 1 to increase the length of the arm, thereby reducing the need for pedaling. The output. The other end of the transmission arm 110 is used to pivot the crank 10 of the bicycle 1, and the pivoting axis of the crank 10 of the bicycle 1 with respect to the transmission arm 110 is parallel to the pivotal axis of the pedal 20. Therefore, the first link 100 can extend the crank 10 of the bicycle 1. A pedal 20 is pivotally disposed on the other end of the second link 200, and the pivoting axis of the pedal 20 is perpendicular to the pivoting axis of the first swing arm 120 relative to the transmission arm 110 and the second swing arm 220 is opposite to the second link The pivoting axis of 200. The second link 200 is capable of maintaining the pedal 20 at the end position of the crank 10 of the bicycle 1, without affecting the knight's stepping posture by installing the bicycle crank extender.

In the bicycle crank extender of the present invention, the pivoting axis of the first swing arm 120 with respect to the transmission arm 110 and the pivot axis of the second swing arm 220 with respect to the second link 200 are parallel to each other. Therefore, the first swing arm 120 and the second swing arm 220 are lie on the same plane to allow interlocking yaw.

In the embodiment, the first link 100 and the second link 200 are preferably curved in an arc shape. Preferably, the transmission arm 110 and the first swing arm 120 are curved and curved. In the example, the direction of the concave side is the same as the following, and the second link 200 and the second swing arm 220 are curved in an arc shape and have the same bending direction. The bending directions of the first link 100 and the second link 200 are opposite to the direction of rotation of the crank 10 of the bicycle 1 when the vehicle is stepped on, and the first link 100 and the crank 10 of the bicycle 1 are continuously arranged in curvature, so that the second can be avoided. The link 200 generates a moment opposite to the stepping direction when stepping on the pedal to cancel the torque that the first link 100 increases in the stepping direction.

When the relative pivotal axis between the first swing arm 120 and the second swing arm 220 is not parallel to the pivotal axis of the first swing arm 120 relative to the transmission arm 110 and the second swing arm 220 is opposite to the second link 200 When the first swing arm 120 and the second swing arm 220 are yawed, the path for the urging arm 210 to translate relative to the transmission arm 110 is also non-linear, so the aforementioned chute 321 must extend along a non-linear line and preferably The translational path of the urging arm 210 is the same as to allow the urging arm 210 to translate relative to the transmission arm 110 and maintain a fixed spacing.

Referring to Figures 3 through 6, when the bicycle 1 is turned, its front wheel 30 is deflected to touch the extension rod. At this time, the first link 100 can be pivoted relative to the transmission arm 110 by the first swing arm 120 thereof, and the second link 200 can be pivoted relative to the second link 200 by the second swing arm 220 thereof. The deflected front wheel 30 is evaded. The first limiting structure 310 cooperates with the second limiting structure 320 to maintain the second link 200 and the transmission arm 110 at a fixed distance and can be relatively translated to allow the second link 200 to pivot relative to the second link 200.

When the bicycle 1 completes the steering and its front wheel 30 is reset, the elastic returning element 400 can pull the second link 200 to the initial relative position for the transmission arm 110 while the second link 200 pushes the second swing arm 220 and the first pendulum The arm 120 pivots back to the original position.

The bicycle crank extender of the present invention extends the length of the crank 10 of the bicycle 1 by the bendable first link 100 and the second link 200 to reduce the force required for pedaling, and when the bicycle 1 is turned, the first company The lever 100 and the second link 200 are bent to evade the deflected front wheel 30, thereby ensuring that the bicycle 1 can still be smoothly steered after the bicycle crank extender of the present invention is installed.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the scope of the patents of the present invention. Other equivalent variations of the patent spirit using the present invention are all within the scope of the patent.

1‧‧‧ bicycle

10‧‧‧ crank

20‧‧‧ pedal

30‧‧‧ front wheel

100‧‧‧first link

110‧‧‧Transmission arm

111‧‧‧First mount

120‧‧‧First swing arm

200‧‧‧second connecting rod

210‧‧‧ force arm

211‧‧‧Second seat

220‧‧‧Second swing arm

310‧‧‧First limit structure

311‧‧‧ Limit pin

312‧‧‧stop

320‧‧‧second limit structure

321‧‧‧ chute

400‧‧‧Elastic reset element

1 is a perspective view of a bicycle crank extender of the preferred embodiment of the present invention.

2 is a perspective exploded view of the bicycle crank extender of the preferred embodiment of the present invention.

3 is a schematic view showing the configuration of a bicycle crank extender of the preferred embodiment of the present invention.

4 to 6 are schematic views showing the use state of the bicycle crank extender of the preferred embodiment of the present invention.

100‧‧‧first link

110‧‧‧Transmission arm

111‧‧‧First mount

120‧‧‧First swing arm

200‧‧‧second connecting rod

210‧‧‧ force arm

211‧‧‧Second seat

220‧‧‧Second swing arm

310‧‧‧First limit structure

312‧‧‧stop

320‧‧‧second limit structure

321‧‧‧ chute

400‧‧‧Elastic reset element

Claims (19)

A bicycle crank extender comprising: a first link comprising a transmission arm and a first swing arm, one end of the transmission arm pivotally connected to one end of the first swing arm and a first limit on the transmission arm And a second connecting rod, comprising: a force applying arm and a second swing arm, wherein one end of the force applying arm is pivotally connected to one end of the second swing arm and the second arm limiting structure is disposed on the force applying arm, the first The other end of the swing arm is pivotally connected to the other end of the second swing arm. The transmission arm and the force applying arm are parallel to each other, and the first swing arm is arranged side by side with the second swing arm. The first limit structure The second limiting structure is movably coupled to maintain the fixed distance between the force applying arm and the transmission arm and to be relatively translatable. The bicycle crank extender of claim 1, wherein the first limiting structure is a limiting pin protruding from the biasing arm to the driving arm, and the second limiting structure is formed through the biasing arm. a sliding slot, one end of the limiting pin is fixed to the transmission arm, and the limiting pin passes through one side of the sliding slot and is slidable along the sliding slot, and the other end of the limiting pin is provided with a slot a stop portion that abuts the opposite side of the chute. The bicycle crank extender of claim 2, wherein the chute extends non-linearly. The bicycle crank extender according to claim 1, wherein the first limiting structure is a slot extending through the transmission arm, and the second limiting structure is a protrusion protruding from the driving arm toward the driving arm. a limiting pin, the one end of the limiting pin is fixed to the sliding arm, and the limiting pin is passed through the sliding slot and can slide along the sliding slot. The other end of the limiting pin is provided with a a stop portion that abuts the opposite side of the chute. The bicycle crank extender of claim 4, wherein the chute extends non-linearly. The bicycle crank extender of claim 1, wherein an elastic returning element is coupled between the first link and the second link. The bicycle crank extender of claim 6, wherein the elastic returning member is coupled to the transmission arm and the force applying arm, respectively. The bicycle crank extender of claim 6, wherein the elastic returning member is coupled to the transmission arm and the force applying arm at a distance along a longitudinal direction of the transmission arm and the force applying arm. The bicycle crank extender of claim 1, wherein a pedal is pivotally disposed on the other end of the force applying arm, and the pivoting axis of the pedal is perpendicular to a pivoting axis of the first swing arm relative to the transmission arm and the The pivoting axis of the second swing arm relative to the force applying arm. The bicycle crank extender of claim 9, wherein the other end of the transmission arm is for pivoting a crank, and the pivot axis of the crank relative to the transmission arm is parallel to the pivotal axis of the pedal. The bicycle crank extender of claim 1, wherein a pivoting axis of the first swing arm relative to the transmission arm and a pivot axis of the second swing arm relative to the force applying arm are parallel to each other. The bicycle crank extender of claim 1, wherein the transmission arm is curved in an arc shape. The bicycle crank extender of claim 1, wherein the first swing arm is curved in an arc shape. The bicycle crank extender of claim 1, wherein the force applying arm is curved in an arc shape. The bicycle crank extender of claim 1, wherein the second swing arm is curved in an arc shape. The bicycle crank extender of claim 1, wherein the transmission arm is continuous with the curvature of the first swing arm. The bicycle crank extender of claim 1, wherein the force applying arm is continuous with the curvature of the second swing arm. The bicycle crank extender of claim 1, wherein the transmission arm and the first swing arm are curved in an arc shape and have the same bending direction. The bicycle crank extender of claim 1, wherein the force applying arm and the second swing arm are curved in an arc shape and have the same bending direction.