JP7445067B1 - treadle pedal bicycle - Google Patents

Abstract

An object of the present invention is to provide a pedal type bicycle 1 that can easily ensure the ease of transmission of pedal load and the stability during running. [Solution] A steering wheel R1 is supported at one end of a vehicle body frame 10 and is linked to the operation of a steering wheel 11 to determine the driving direction, and a steering wheel R1 is supported at the other end of the vehicle body frame 10 and is oriented in the left-right direction of a driver P. A pair of driven wheels R2 arranged apart from each other, a seat portion 12 supported at the center of the vehicle body frame 10, and a drive wheel supported at a midway portion of the vehicle body frame 10 closer to the front than the seat portion 12. wheel R3, and a pair of push-in pedals 20 that are located in the middle of the vehicle body frame 10, below the seat section 12 and above the drive wheel R3, and arranged on the left and right sides of the vehicle body frame 10. , a transmission section 30 that cooperates between the step-on pedal section 20 and the rotating shaft of the drive wheel R3 to rotate the drive wheel R3 in conjunction with the vertical relative operation of the pair of step-on pedal sections 20. [Selection diagram] Figure 1

Description

TECHNICAL FIELD The present invention relates to a pedal-type bicycle, and more particularly, to a pedal-type bicycle that can easily ensure transmission of pedal load and stability during running.

Conventionally, a bicycle that moves by pedaling to make a 360° rotational motion (hereinafter simply referred to as a "rotating pedal bicycle") has been used to move by stepping on a pedal that makes a reciprocating motion in an up-down direction or a front-back direction. 2. Description of the Related Art Bicycles that run (hereinafter simply referred to as "step-pedal bicycles") are known.

This treadle pedal type bicycle can reduce the load when the driver operates the pedals compared to a rotary pedal type bicycle, assuming that self-propulsion at high speeds (for example, 15 to 20 km) is difficult. At the same time, the range of motion can be reduced.

This allows even elderly people to go shopping by bicycle, thereby improving their living environment.

JP2016-179711A

However, the above-mentioned treadle-pedal bicycles use a system that transmits the power from pedaling to the rear wheel behind the rider, which solves the problem of still having a large load when depressing the pedals. I couldn't resist.

In addition, because power is transmitted using one rear wheel as the drive wheel, it is difficult for elderly people to maintain balance when riding at low speeds on conventional pedal-type bicycles that cannot run at high speeds. It was occurring.

Therefore, it may be possible to easily maintain balance by arranging the rear wheels, which are the drive wheels, as a pair on the left and right, but driving two drive wheels with a large footprint increases the load when stepping on the pedal. A new problem arises.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pedal type bicycle that can easily transfer pedal load and ensure stability during riding.

In order to solve the above-mentioned problems, the present invention includes a vehicle body frame that extends in the front-rear direction with reference to the driver's driving posture, and a steering wheel that determines the direction of travel in conjunction with the operation of a handle supported at one end of the vehicle body frame. a pair of driven wheels supported by the other end of the vehicle body frame and spaced apart from each other in the left-right direction of the driver; a seat supported by the center of the vehicle body frame; The drive wheel is supported toward the front of the seat, and the drive wheel is located in the middle of the vehicle body frame, below the seat and above the drive wheel, and arranged on the left and right sides of the vehicle body frame. The device includes a pair of pedals, and a transmission unit that connects the pedals and a rotating shaft of the drive wheel to rotate the drive wheel in conjunction with relative vertical operations of the pair of pedals.

In a treadle-type bicycle, the driver, sitting on the seat, rotates the drive wheel by depressing one of the pair of treadle-type pedals, which is located above the pedals. You can run by stepping on them alternately.

According to the present invention, it is possible to easily ensure the ease of transmitting the stepping load and the stability during running.

A treadle pedal type bicycle according to the present embodiment is shown, in which (A) is a side view of the treadle pedal type bicycle, and (B) is a plan view of the treadle pedal type bicycle. 1 is an enlarged plan view of a main part of a pedal-type bicycle according to an embodiment of the present invention; FIG. The pedal type bicycle according to the present embodiment is shown, in which (A) is an explanatory diagram of the power transmission system when the pedal body is at the top dead center, and (B) is an explanatory diagram of the power transmission system when the pedal body is at the bottom dead center. This is an explanatory diagram of the system. A treadle pedal type bicycle according to the present embodiment is shown, in which (A) is a cross-sectional view of one example of the transmitting part, (B) is a cross-sectional view of another example of the transmitting part, and (C) is a cross-sectional view of still another example of the transmitting part. Figure.

Next, a pedal type bicycle according to an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, a pedal-type bicycle 1 has a body frame 10 that extends in the front-rear direction based on the driving posture of a rider P, and a running direction that changes in conjunction with the operation of a handle 11 supported at one end of the body frame 10. A defined steering wheel R1, a pair of driven wheels R2 supported by the other end of the vehicle body frame 10 and spaced apart from each other in the left-right direction of the driver P, and a seat portion supported by the central portion of the vehicle body frame 10. 12, a drive wheel R3 that is in the middle of the body frame 10 and supported closer to the front than the seat part 12, and a drive wheel R3 that is in the middle of the body frame 10 and is below the seat part 12 and above the drive wheel R3. A pair of step-on pedal sections 20 are located on the left and right sides of the vehicle body frame 10, and the step-on pedal sections 20 and the rotating shaft of the drive wheel R3 are linked to form a pair of step-on pedal sections 20. and a transmission section 30 that rotates the drive wheel R3 in conjunction with the vertical relative operation of the drive wheel R3.

The vehicle body frame 10 includes a shaft-shaped main frame 13 and a plate-shaped subframe 14 provided at the rear end of the main frame 13.

Note that "one end" in the claims generally refers to one end of the vehicle body frame 10 as a whole, and also refers to the tip end of the main frame 13. Further, the term "other end" is a general term for the other end of the vehicle body frame 10 as a whole, and is also located near the rear end of the subframe 14. Further, the term "middle part" is a general term for the vicinity of the center of the vehicle body frame 10 without any particular limitation, and refers to the vicinity of the front-rear center of the main frame 13 to the vicinity of the tip of the sub-frame 14.

Therefore, each of the above-mentioned parts indicates a part in the sense of considering various structures that can be taken in terms of design and strength of the vehicle body frame 10, and the structure thereof is not particularly limited.

In this embodiment, a handle shaft 16 is rotatably supported at the distal end of the main frame 13 via a support cylinder 15 in a direction around an axis. A handle 11 is fixed to the upper end of this handle shaft 16. Further, the lower end portion of the handle shaft 16 is integrally provided with a bifurcated bearing portion 16a, and the steered wheel R1 is rotatably supported between the bifurcated bearing portions 16a.

Further, the subframe 14 is fixed to the lower end of a bifurcated reinforcing portion 17 provided at the rear end of the main frame 13 at the left and right midway in the front-rear direction. A driven wheel R2 is rotatably supported via a bracket 18 on the left and right sides of the bottom surface near the rear end of the subframe 14.

The seat section 12 is attached to a support column 19 that rises from the rear end of the main frame 13, and can have an appropriate configuration such as vertical height adjustment and rotation for raising and lowering as necessary. can.

In the seat portion 12, a backrest 12c is attached to the seat portion 12a via a plate spring-like connector 12b, ensuring stable sitting comfort even for elderly people. The seat portion 12 may be of a known substantially triangular saddle type or the like, in addition to the rotary type described above.

On the other hand, a bifurcated bearing portion 13a is integrally provided in the middle of the main frame 13 toward the lower end, and the drive wheel R3 is rotatably supported between the bifurcated bearing portions 13a.

Next, with reference to FIGS. 2 and 3, specific configurations of the step-on pedal section 20 and the transmission section 30 will be described.

The pedal parts 20 are arranged on the left and right sides with the main frame 13 in between, and are fixed to a pedal main body 22 with a rotating shaft 21 at one end and to the distal end surface of the sub-frame 14, and are connected to each other via the rotating shaft 21. The pedal body 22 is provided with a support bracket 23 that supports the pedal body 22 and prevents the pedal body 22 from moving downward.

The support bracket 23 is formed with an opening 24 to avoid interference with the end of the pedal body 22 on the rotation fulcrum side (rotation shaft 21 side), and a long hole 25 to allow cooperation of a transmission section 30, which will be described later. has been done.

The transmission section 30 is provided at a link connection section 31 protruding from the bottom surface near the free end of the pedal body 22, and at both ends of the axle shaft 32 of the drive wheel R3, with one end side rotating relative to the axle shaft 32 with a phase shift of 180 degrees. It includes a rotating plate 33 that is immovably fixed, and a link plate 34 that has one end connected to the link connecting portion 31 and the other end connected to the free end of the rotating plate 33. In addition to being plate-shaped, the link plate 34 can also be made of a steel gland material with a diameter of about 5 mm in an appropriate shape (for example, both ends are looped). Therefore, for convenience of explanation, the link plate 34 is not shown in FIG. 2, and is simply shown as a thick line in FIG. 3.

In this embodiment, the rotating plate 33 faces upward (straight above) when the free end of the pedal body 22 is at the highest position (hereinafter, this state is also referred to as "top dead center"), and the When the free end of the main body 22 is at the lowest position (hereinafter, this state is also referred to as "bottom dead center"), it is directed downward (directly below).

At this time, when the free end of the pedal body 22 is at the top dead center, the tip of the link connecting portion 31 is located behind the edge straight line, and the rotating plate 33 is at an angle T from the vertical line to the horizontal line. If the position is within this range, when the pedal body 22 is depressed, the rotary plate 33 will naturally rotate in the forward direction, and the drive wheel R3 can be rotationally driven in the forward direction with a gentle and light depression load. In the present embodiment, in order to ensure more reliable starting performance when the pedal is depressed, it is inclined by an angle T1 (approximately 10° to 30°) as shown in FIG.

An elongated hole 33a is provided near the free end of the rotary plate 33 at a connection portion with the link plate 34 to allow smooth power transmission. Further, as shown in FIG. 4A, the link connecting portion 31 and one end of the link plate 34, and the free end of the rotating plate 33 and the other end of the link plate 34 are connected to each other via screws 35 and 36, for example. connected.

With such a basic configuration, the treadle-type bicycle 1 according to the present embodiment allows the driver to step on one of the pair of treadle-type pedals 20 located on the upper side while sitting on the seat part 12. The drive wheels R3 rotate, and the vehicle can then travel by alternately depressing the pair of pedals 20.

Here, since the driving wheel R3 has a larger diameter than the steered wheel R1 and the driven wheel R2, and the steered wheel R1 has a larger diameter than the driving wheel R3, it is easy to transfer the stepping load when driving the driving wheel R3. performance (load reduction) has been further improved.

Note that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit and technical idea thereof. Hereinafter, such modifications will be explained in order.

(1) First Modification In the above embodiment, as shown in FIG. The other end is connected via screws 35 and 36, respectively. However, in order to ensure smooth power transmission, for example, as shown in FIG. The free end of the plate 33 and the other end of the link plate 34 may be connected via screws 35 and 36, respectively.

(2) Second Modification Similarly, as shown in FIG. 4(C), the long hole 34a provided at one end of the link connecting portion 31 and the link plate 34, and the free end of the rotating plate 33 and the link plate 34 The long holes 34b provided at the other end may be connected via screws 35 and 36, respectively. It goes without saying that it is also possible to use together what is shown in FIG. 4(A) and what is shown in FIG. 4(B), or with what is shown in all of FIG.

The embodiments of the present invention have been described above in detail with reference to the accompanying drawings. However, it goes without saying that the scope of the technical idea of the present invention is not limited to the embodiments described here. A person having ordinary knowledge in the technical field to which the present invention pertains would be able to conceive of making various changes, modifications, combinations, etc. within the scope of the technical idea of the present invention as described in the claims. It is clear that it can be done. Therefore, subsequent techniques such as these changes, modifications, and combinations naturally fall within the scope of the technical idea of the present invention.

Although not illustrated in detail, the present invention can be implemented with various modifications within the scope of the invention.

1 Depress pedal type bicycle 10 Body frame 11 Handle 12 Seat part 12a Seat part 12b Connector 13 Main frame 13a Bearing part 14 Sub frame 15 Support cylinder 16 Handle shaft 16a Bearing part 17 Reinforcement part 18 Bracket 19 Pillar 20 Depress type pedal part 21 Rotating shaft 22 Pedal body 23 Support bracket 24 Opening 25 Elongated hole 30 Transmission part 31 Link connection part 31a Elongated hole 32 Axle 33 Rotating plate 33a Elongated hole 34 Link plate 34a Elongated hole 34b Elongated hole 35 Screw P Driver R1 Steering wheel R2 Driven wheel R3 Drive wheel

Claims (2)

A vehicle body frame that extends in the front and back direction based on the driver's driving posture;
a steering wheel that defines a running direction in conjunction with the operation of a handle supported at one end of the vehicle body frame;
a pair of driven wheels supported by the other end of the vehicle body frame and spaced apart from each other in the left-right direction of the driver;
a seat portion supported by a central portion of the vehicle body frame;
a drive wheel supported at a midway portion of the vehicle body frame closer to the front than the seat portion;
a pair of pedal parts located in the middle of the body frame, below the seat part and above the drive wheels, and arranged on the left and right sides so as to sandwich the body frame;
a transmission unit that rotates the drive wheel in conjunction with the pedal unit and a rotation shaft of the drive wheel in conjunction with relative vertical operation of the pair of pedal units ;
Equipped with
The pedal section is
A pedal body with a rotating shaft on one end,
a support bracket fixed to the vehicle body frame, supporting the pedal body via the rotating shaft and preventing downward movement of the pedal body;
A bicycle equipped with pedals, characterized by comprising : A bicycle comprising the pedal according to claim 1 ,
The driving wheel has a larger diameter than the steering wheel and the driven wheel,
The steered wheel has a larger diameter than the driven wheel .
A bicycle equipped with pedals .

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