JPS5918958Y2 - Drive mechanism in bicycles, etc. - Google Patents

Description

[Detailed Description of the Invention] This invention relates to the disclosure of a more effective human-powered drive structure for a two-wheeled, three-wheeled, or four-wheeled bicycle that is manually driven.

Therefore, one of the anticipated main objectives of this invention is to eliminate as much as possible the reversing action that is "play" when pedaling a bicycle, etc., and to always move the pedal within 180 degrees of the front side where the pedal is activated. The idea is to extract only the rotating part of the bicycle, thereby ensuring efficient bicycle driving.

Next, one of the other main objectives of the present invention is to reduce the operating range of the crank when driving a bicycle to within 180 degrees toward the front of the pedal, compared to the conventional 360 degree full rotation. This is because it enables the use of a long crank, thereby significantly facilitating the pedal input.

Furthermore, one of the other main objectives anticipated in the present invention is to make it possible to freely change the length dimension of the crank, and to make it possible to operate and depress according to changes in starting torque and driving torque. It was placed in such a way that it could be confirmed.

Next, one of the other main purposes anticipated in the present invention is to drive the petal crank in a manner that corresponds to the purpose of use, such as alternately or simultaneously depressing, or depressing only one of them. The point is that the method can be adopted arbitrarily.

Furthermore, the various other objectives anticipated in the present invention will be made clear in turn from the following explanations, and the present invention aims to achieve appropriate and consistent effects of these characteristics. The gist of its structure is to have a pair of left and right petal cranks rotatably supported on a shaft so as to be free except when stepping forward and sideways, and a gear and rear which are integrally fixed to the shaft frame of these cranks. It is placed in such a way that a chain is mounted between the wheel shaft gears and linked together.
Also, considerable design changes were planned in line with the gist of the idea.

Hereinafter, details of the present invention will be explained with reference to a typical embodiment shown in the drawings. Reference numeral 1 is a bicycle based on a commonly known aspect, and can be used not only for two-wheeled bicycles but also for three-wheeled or four-wheeled bicycles. Needless to say, the installation of the same mechanism and its similar effects were expected.

Therefore, in contrast to the full-rotation bearing of a normal beta crank (also called a gear crank), the bearing 3 is designed so that the crank 2 rotates only within a range of 180 degrees to the side before it is depressed, and this bearing 3, the shaft is supported in a free state except when the pedal is depressed toward the front and side.

For the purpose of restricting rotation within 180 degrees in front of the pedal, stopper arms 5 to 5 are connected to the lower limit position of rotation of each crank 2 from the bearing 4, and Spring 7 between crank 2 and vertical vibro
is installed, so that the crank 2 is always towed and held in the upper drive starting position.

Therefore, the crank 2 is depressed and driven between this almost vertical starting position and the previous arm 5 against the force of the spring 7.
During the elastic reversal, the bearing 3 is free and does not affect the shaft frame 8 in any way.

A gear 9, which has a relatively large diameter, is integrally fixed to the shaft frame 8, which has a similar structure, and a chain is connected between the gear 10, which is driven when the rear wheel shaft rotates forward, and is free when reversed. 11
The system was designed to have two parts mounted on the body so that they could be driven together.

The length of the crank 2 from its support shaft can be freely changed as necessary, that is, the amount of additional torque can be selected at any time, and the crank 2 can be used at startup, at low speed, at medium speed, or at high speed. etc., it is possible to create a length suitable for each driving speed.

That is, the crank 2 includes a base culm 2a, an auxiliary cylinder frame 2b slidably fitted onto the rod 2a, and the auxiliary cylinder frame 2b.
It is composed of a bevel 2C which is supported by a shaft on the free end of the auxiliary cylinder rod 2b, and a spring 2d which always springs the base culm 2a which has been fitted into the auxiliary cylinder rod 2b is interposed. The other free end of the wire 13 connected to the lever 12 is fixed to the auxiliary cylinder frame 2b so that the cylinder rod 2b can be pulled at any time, that is, pulled against the repulsive force of the spring 2d. It's something I did.

The present invention has a unique configuration for diagonally upward movement, in particular, the rotation position and rotation width of the petal crank 2 are placed within 180 degrees to the side in front of the most efficient depression, and the length of the cranks is compared. The length of the crank is designed to be long, and the length can be changed as necessary, and the length of the crank can be changed accurately not only when driving but also when stopped. By doing so, specific effects of the above-mentioned characteristics are promised.

In the past, this type of bicycle was driven by the rotation of the crank over 360 degrees, but in relation to the pedal position, a vertical baseline was usually used as the base point of the crankshaft. Within a range of 180 degrees on the front side of the motor, effective tread compression is recognized only within a range narrower than this 180 degrees, and other rotational movements are "play" parts that have nothing to do with driving. It was understood as.

The present invention eliminates the rotary motion part that is not recognized as a drive input, which was conventionally accepted in bicycles, and replaces it with only the pedal drive directed toward the front, and also allows the length of the basic crank to be changed freely. This is intended to allow for more reliable and smooth running of the bicycle by making it possible to change the torque generated.

As mentioned above, by denying the rotational drive of the crank, there is a risk that the petal crank will hit the ground, as well as the problems of unreasonable extension of the rotation radius (and therefore unreasonable extension of the runner's legs). It has the feature of being able to freely set the pedal effort without any effort, and by changing the crank length instead of the conventional gear changing method, it has made it possible to perform delicate speed changes that match the rider's leg strength, etc. It is a thing,
Also, unlike gear switching, it is impossible to do so, and of course when driving,
□ also enables such arbitrary speed change when the vehicle is stopped.

The present invention is suitable for two-, three- or four-wheeled bicycles, which have a simple structure and extremely high drive efficiency, using a free shaft bearing crank whose rotation width is restricted and which is driven only when stepping forward. The present invention relates to the disclosure of a drive mechanism for

[Brief explanation of the drawing]

Figure 1 is a side view showing a typical embodiment of the present invention; Figure 2 is a side view showing a typical embodiment of the present invention;
The figure is a side view of the main part of the crank, and FIG. 3 is a partially cutaway plan view of the crank part. In the diagram, 1...bicycle, 2...crank, 3...
Bearing, 4...Bearing, 5...Pa arm, 6...Vertical pipe, 7...Spring, 8...Shaft frame, 9...Gear, 10...Gear, 11...Chain , 12...
Lever, 13. This shows the wire.

Claims (1)

[Scope of utility model registration request] The petal cranks 2 forming a pair of left and right are rotatably supported on a shaft so as to be free except when the pedal is depressed toward the front side, and the rotation width of the petal cranks 2 is adjusted to the front side 18 when the pedal is depressed.
The gear 9 and the rear wheel shaft gear 10 are fixed to the shaft frame 8 of the crank 2.
In a structure in which a chain 11 is mounted and interlocked between the petal cranks 2 and the frame body, a spring 7 is interposed between the petal crank 2 and the frame body at an appropriate position to elastically pull the petal crank 2 upward and sideways. A drive mechanism for a bicycle or the like, characterized in that a crank 2 is made up of parts, which are telescopically fitted together, and the width of this telescoping is regulated by a wire 13 connected to a lever 12.