JPH0692284A - Pedaling force increase mechanism for bicycle - Google Patents

Abstract

PURPOSE:To make the distance between a pedal and a driving shaft long at the time of pressing the pedal down and make the distance between the pedal and the driving shaft short at the time of pulling the pedal up so as to reduce force at the time of pedaling a bicycle. CONSTITUTION:A fixed member 3 integral with the driving shaft 2 of a bicycle is provided with a crankshaft 4, and a first crank arm 5 is rotatably fitted to the crankshaft 4. A second crank arm 7 is rotatably fitted to the first crank arm 5 through a crankpin 6. A pedal 8 is fixed to the other end of the second crank arm 7, and the pressing force of the pedal 8 is transmitted to the driving shaft 2 by a pedal arm 12 with one end thereof rotatably fitted to the pedal 8 and with the other end side slidably fitted to the fixed member 32. At the time of pressing the pedal down, the first and second crank arms 5, 7 are extended, and at the time of pulling the pedal up, the first and second crank arms 5, 7 are lapped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pedaling force increasing mechanism for reducing pedaling force on a bicycle.

[0002]

2. Description of the Related Art As a method of reducing the power of pedaling a bicycle, it is conceivable to increase the distance between the drive shaft and the pedal based on the principle of leverage. However, in reality, the radius of gyration of the pedal is naturally limited due to the ease with which a person's legs can move.

[0003]

As a result of various studies in view of the above, the present invention makes the distance between the pedal and the drive shaft variable, and the pedal and the drive shaft are maximized when the pedal is depressed. This is a mechanism that can increase the pedal effort.

That is, according to the present invention, a crank shaft is provided on a fixed member which is integral with a drive shaft of a bicycle, a first crank arm is rotatably attached to the crank shaft, and a second crank arm is attached to the first crank arm via a crank pin. A crank arm is rotatably attached, a pedal is fixed to the other end of the second crank arm, and one end is rotatably attached to the pedal and the other end is slidably attached to the fixing member. Which transmits the power to the drive shaft, wherein the first and second crank arms extend when the pedal is depressed, and the first and second crank arms overlap when the pedal is pulled up. Is.

[0005]

EXAMPLE An example of the present invention will be described below. As shown in Fig. 1, you can rotate by stepping on the pedal of the bicycle,
A chain sprocket that transmits the torque to the rear wheels (1)
The disc member (3) was further integrally fixed to the drive shaft (2) to which was fixed. A crankshaft (4) is provided on the outer peripheral edge of the disc member (3), one end of a first crank arm (5) is rotatably attached to the crankshaft (4), and a crankpin ( The second crank arm (7) was rotatably attached via 6). Pedal (8) is the second crank arm
The pedal shaft (9) fixed to the other end of the second crank arm (7) is fixed at a position orthogonal to the second crank arm (7) and the pedal surface is aligned with the longitudinal direction of the second crank arm (7). did.

Further, a fulcrum member (10) is provided on the mounting surface of the crankshaft (4) of the disc member (3) on the opposite side of the center of the disc member (3) from the crankshaft (4). Further, a pedal arm (12) having one end rotatably attached to the pedal shaft (9) and having a slide elongated hole (11) formed toward the other end side is provided with the slide elongated hole (11). ) And the fulcrum member (10) at the same time, the pedal arm (12) engages the crankshaft (4) and the fulcrum member (10) while
It is configured to slide in the direction connecting the (4) and the fulcrum member (10).

Further, when the pedal (8) is stepped on, that is, when the pedal is positioned on the front side in the traveling direction of the bicycle, the first crank arm (5) and the second crank arm (7) do not overlap each other and form a linear shape. Adjusted to extend to.

As can be seen from the sectional view taken along the drive shaft (2) in FIG. 2, the first crank arm (5) and the second crank arm (7) on either the left or right side are the same as described above. When it is in a linearly extended state (X side in the drawing), the first crank arm (5) and the second crank arm (7) overlap (Y in the drawing) on the other side. did.
In the figure, (13) shows the bearing case of the drive shaft, and (14)
Indicates a fixing screw for fixing the disc member (3) to the drive shaft (2). Further, (15) shows the guide roller shaft connected to the crank shaft (4) by the fixing pin (16) and the guide roller shaft around the fulcrum member (10), both of which are engaged by the guide roller (17). is doing. Further, (18) is a guide panel that prevents the guide rollers and the like from falling off.

According to such a mechanism, when the pedal (8) is depressed as shown in FIG. 3 (state A → B in the figure), the position (pedal) on which the pedal force acts and the drive shaft (2) The distance is increased and the pedal effort is small. When the pedal is further stepped on, the pedal (8) is always kept horizontal on the flat bottom of a person's shoe, so that the second crank arm (7) integral with the pedal (8) is also always kept horizontal. . Therefore, B → C → in FIG.
As in the state of D, the pedal arm (12) slides to gradually bring the pedal (8) closer to the drive shaft (2). And pedal
When pulling up (8), that is, when depressing the pedal on the opposite side, the distance between the pedal (8) and the drive shaft (2) becomes shorter as shown in FIG. 4 (D → E in the figure). At the position opposite to B, the first crank arm (5) and the second crank arm
Since it overlaps with (7) (state E in the figure), the distance between the pedal (8) and the drive shaft (2) is the shortest. Next, when the pedal (8) moves upward, the pedal (8) gradually moves away from the drive shaft (2) contrary to the above as shown by E → F in FIG. Maximum distance. The pedal on the other side is 18
The mechanism is similar except that it is delayed by 0 °.

[0010]

As described above, according to the mechanism of the present invention, when the pedal is depressed, the distance between the pedal and the drive shaft can be lengthened, and when the pedal is pulled up, the distance between the pedal and the drive shaft can be shortened. It is possible to reduce the force required when rowing a bicycle. Moreover, since the radius of rotation of the pedal is the same as that of the conventional pedal arm fixed type, the degree of rotation of the legs when rowing is not much different from that of the conventional one, so that a light riding comfort can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part showing an embodiment of the present invention.

FIG. 2 is a sectional view of an essential part showing an embodiment of the present invention.

FIG. 3 is an explanatory view explaining the movement of the mechanism of the embodiment of the present invention.

FIG. 4 is an explanatory diagram for explaining the same movement.

[Explanation of symbols] 1 chain sprocket 2 drive shaft 3 disc member 4 crankshaft 5 first crank arm 6 crank pin 7 second crank arm 8 pedal 9 pedal shaft 10 fulcrum member 11 slide hole 12 pedal arm 13 bearing case 14 fixed Screw 15 Guide roller shaft 16 Fixing pin 17 Guide roller 18 Guide panel

Claims (1)

[Claims] 1. A crankshaft is provided on a fixed member integral with a drive shaft of a bicycle, a first crank arm is rotatably attached to the crankshaft, and a second crank arm is attached to the first crank arm via a crank pin. Rotatably attached,
The pedal is fixed to the other end of the second crank arm, and one end is rotatably attached to the pedal and the other end is slidably attached to the fixing member. The pedal arm transmits the pedaling force to the drive shaft. There is provided a pedal pedal force increasing mechanism for a bicycle, wherein the first and second crank arms extend when the pedal is depressed, and the first and second crank arms overlap when the pedal is pulled up.