Power assist bicycle

Abstract

To solve the problem that since a bicycle is conventionally driven by feet force alone, a user becomes tired after many hours' riding; on a flat road, it is possible to ride lightly but on an up-slope, a great feet force is necessary and speed lowers suddenly at the time of gear change; a bicycle with an electric motor is effective as means for solving the problem, but expensive components such as a motor, a battery and the like are required and the battery needs to be charged.SOLUTION: The current invention rotates a bracket not only by pedaling by foot but also by moving the upper half of the body back and force by using the abdominal muscle, the dorsal muscle, and an arm force in order to drive a bicycle, transmits the force to wheels via a gear and a ratchet mechanism, and increases the bicycle's driving force. The current patent has a very simple mechanism, and because it adopts a natural movement of the upper half of the body, it enables a user to ride on the bicycle just as if riding on a conventional bicycle.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention generates rotational force for the bicycle tire by moving the upper body back and forth to rotate a bracket attached under the saddle around a rotation axis, and transmitting the force to a ratchet gear attached to the bicycle axle via a fan-shaped gear fixed to the bracket. [Background technology]

[0002] There have been attempts to apply driving force to a bicycle via a belt or chain by using arm strength or by moving the body up and down to turn a rotating body, but the mechanisms were large and required significant modifications to the bicycle, and were not very efficient. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Table 2021-517540 [Patent Document 2] Patent Publication No. 51-112043 Summary of the Invention [Problem to be solved by the invention]

[0004] Since bicycles are propelled using only leg power, pedaling for a long time can tire your legs, and when you come to an uphill slope, it takes a lot of pedaling power to go up. Also, if you change the gears, the pedaling power decreases, but your speed drops dramatically, which means you have to keep pedaling for a long time. [Means for solving the problem]

[0005] This invention generates torque for the bicycle tire by using arm strength, abdominal muscles, and back muscles to rotate a bracket attached under the saddle. The torque is transmitted via two fan-shaped gears attached to the bracket to a ratchet gear attached to the tire's rotating shaft. This patented device is characterized by its efficient transmission of pedaling force by connecting the drive wheel directly to the gears using a simple mechanism, without using mechanisms such as belts or chains. The movement of moving the body back and forth is rhythmic and feels completely natural compared to pedaling with the feet. Furthermore, the use of two fan-shaped gears allows for the generation of driving force whether the body is moving forward or backward. The bracket can also be fixed in place by pulling a lever. This patented device inherits the shape of a conventional bicycle and can be realized by simply modifying certain parts of the bicycle, such as the rear wheel axle and the frame under the saddle. [Effects of the Invention]

[0006] The bicycle of the present invention places less strain on the legs even when riding for long periods of time, and allows the rider to ride comfortably even uphill by using the power of the entire body while maintaining the bicycle's speed. [Brief explanation of the drawings]

[0007] [Figure 1] Front view of a power-assisted bicycle [Figure 2] Plan view of a power-assisted bicycle [Figure 3] A-A cross section of Figure 2 DETAILED DESCRIPTION OF THE INVENTION

[0008] [Example]

[0009] An internal fan gear 8 and an external fan gear 6 are mounted on bracket 4, stacked with a gap between them, and when the driver moves his / her upper body in direction C, the external fan gear 6 rotates in direction D around rotation axis 7, and the meshed external ratchet gear 11 rotates in direction G, generating a forward force on the rear tire 10. Next, when the driver moves his / her body in direction B, the internal fan gear 8 rotates in direction E, and via the intermediate gear 13, the internal ratchet gear 12 rotates in direction G, generating a forward force on the rear tire 10. [Explanation of symbols]

[0010] 1. Handle 2. Saddle 3 pedals 4. Bracket 5. Basket 6. Fan-coil gear 7. Rotation axis 8....Inner sector gear 9. Front tire 10 Rear tire 11. External ratchet gear 12·····Inner ratchet gear 13. Intermediate gear 14 Lever

Claims

1. The drive device has a bracket 4 attached under the saddle 2, an external fan gear 6 attached thereto, and an external ratchet gear 11 meshing therewith and attached to the axle of the rear wheel tire.

2. The drive device has a bracket 4 attached under the saddle 2, an inner fan gear 8 attached thereto, an intermediate gear 13 meshing therewith, and an inner ratchet gear 12 attached to the axle of the rear wheel tire meshing therewith.

3. The drive device can transmit force to the axle of the rear wheel tire continuously in response to the forward and backward movement of the upper body by attaching the external fan gear 6 of claim 1 and the internal fan gear 8 of claim 2 to the bracket 4 fixed under the saddle 2.

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