JPS6124234B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a three-wheeled bicycle that is particularly suitable for riding by physically handicapped people and the elderly.

[Conventional technology]

Conventionally, for example, a physically disabled person uses a wheelchair when traveling on the road, and this wheelchair is equipped with a parking brake (unspecified literature).

[Problem that the invention seeks to solve]

However, with the above-mentioned wheelchair, when you suddenly encounter an oncoming vehicle while driving uphill, or when you are getting off the vehicle, you may want to apply emergency reverse braking. It was difficult for him to operate the machine due to his physical disability.

This invention was made to solve this problem, and it is possible to perform reverse braking on an uphill slope easily and quickly without relying on the parking brake, thereby increasing safety. purpose.

[Means for solving problems]

In order to achieve the above object, in the present invention, as shown in FIG. 1, a front wheel 4 is provided at the left and right center of the front end of the vehicle body, and which can be freely steered by a handle 3. Based on the assumption that the tricycle is equipped with a tricycle, it is equipped with one turning handle 12 for rear wheel drive that is interlocked with the left and right rear wheels 5l and 5r, and each transmission system between the turning handle 12 and the left and right rear wheels 5l and 5r is provided. The transmission systems are configured to have opposite rotational directions, and one-way rotation clutches 33 and 34 are interposed in the transmission systems for the left and right rear wheels 5l and 5r, respectively, to transmit only forward rotational power to the rear wheels 5l and 5r. It is characterized by

[Effect]

In the above configuration, when the rotation of the rotary handle 12 is stopped when traveling uphill, the left and right rear wheels 5l, 5r both tend to rotate rearward because the vehicle body tends to move backward due to its own weight. In this case, the left and right unidirectional rotating clutches 33, 34 are connected to the rear axles 25, 2, respectively.
However, since the rotation directions of the left and right transmission systems are opposite, the reverse drive from both rear wheels cancels out, and in the end, the vehicle's own weight prevents it from moving backwards. , without relying on the parking brake.
Reverse braking is possible.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in FIGS. 1 and 2, a vehicle body frame 1 is constructed by assembling pipe materials into a substantially rectangular lattice shape when viewed from above, and a front wheel stay 2 erected at the left and right center of the front end of the vehicle body frame 1 has a round shape, etc. A steerable front wheel 4 is supported by a handle 3, and a pair of rear wheels 5l and 5r are pivotally supported on the left and right sides of the rear part of the frame. frame 1
A seat 8 having a footrest 6 and an armrest 7 is disposed at the left and right center of the rear part of the seat 8 so as to be pivotable about a fulcrum x. On the side of this seat 8 is a lock lever 9.
is provided, so that the seat 8 can be fixed in the forward-facing normal driving position and the boarding/exiting position rotated to the left. A trunk 11 having a lid 10 that can be opened and closed is disposed below the seat 8.

A rotating handle 12 for rear wheel drive is provided on a frame portion 1' standing upright on the right front side of the seat 8, and this is linked to left and right rear wheels 5l and 5r via a chain transmission shown in FIG. connected.

That is, a first sprocket 13 that rotates integrally with the turning handle 12 and a second sprocket 14 that is pivotally supported below the first sprocket 13 are wound and interlocked by a chain 15, and a third sprocket 16 that is integrated with the second sprocket 14 and a third sprocket 16 that is integrated with the second sprocket 14 below it are connected. A fourth sprocket 17, which is pivotally supported, is wound and interlocked with a chain 18. Furthermore, a fifth sprocket 19, which is integrated with the fourth sprocket 17, and a fifth sprocket 17, which is pivotally supported on the front part of the vehicle, are connected to each other. 7 sprocket 22
are engaged and are interlocked in reverse rotation. And the seventh
The sprocket 22 and the eighth sprocket 23 provided on the left side of the vehicle body are connected by an interlocking shaft 42.
The sprocket 23 and a ninth sprocket 25 provided on the left rear axle 24 are interlocked by a chain 26. Further, a 10th sprocket 27 is engaged with this chain 26 from the outside and is interlocked with the reverse rotation, and this 10th sprocket 27 and an 11th sprocket 28 provided on the right side of the vehicle body are connected by an interlocking shaft 29, and the 11th sprocket 28 and a twelfth sprocket 31 provided on the right rear axle 30 are interlocked by a chain 32. Further, the ninth sprocket 25 and the twelfth sprocket 31 transmit power to the respective rear axles 24 and 30 only when they are rotated forward.
It is attached to the rear axles 24, 30 via one-way rotation clutches 33, 34 which transmit the transmission to the rear axles 24, 30.

As is clear from the above configuration, from the eighth sprocket 23 onward, the transmission system to the left rear axle 24 and the transmission system to the right axle 30 have opposite rotational directions.
When the rotary handle 12 rotates in the same direction, the ninth sprocket 25 and the twelfth sprocket 31 are rotated in opposite directions.

If this happens, turn the handle 1 when driving uphill.
When rotation of wheel 2 is stopped, the vehicle body tries to move backward due to its own weight, so both the left and right rear wheels 5l and 5r try to rotate backward. In this case, the left and right unidirectional rotating clutches 33 and 34 are reversely driven from the axles 24 and 25, respectively, but since the rotational directions of the left and right transmission systems are opposite, the reverse drive from both rear wheels is reverse driven. are canceled out, and in the end, the vehicle body's own weight is prevented from receding.

Incidentally, braking during normal forward running is performed by operating a brake 35 installed on the left rear axle 24 with a grip lever 36 attached to the steering handle 3. Further, the right rear axle 30 is equipped with a parking brake 38 operated by a separate handle lever 37 to improve safety.

In addition, to give a specific example of the number of teeth of each of the above sprockets, the first sprocket 13 has 36 teeth, the second sprocket 14 has 48 teeth, and the third sprocket 16 has 20 teeth.
48 pieces for the 4th sprocket 17, 44 pieces for the 5th sprocket 19, 24 pieces for the 6th sprocket 20,
The 7th sprocket 22 has 40 pieces, the 8th sprocket 23 has 48 pieces, the 9th sprocket 25 has 16 pieces, and the 10th sprocket has 16 pieces.
Sprocket 27 has 36 pieces, 11th sprocket 28
has 19 pieces, and the 12th sprocket 31 has 18 pieces. Incidentally, the diameter of the front wheel 4 is 20 inches, and the diameter of the rear wheels 5l and 5r is 16 inches.

Therefore, the transmission ratios from the eighth sprocket 23 to the left and right rear axles 24 and 30 are made different, and the transmission ratio from the turning handle 12 to the left rear axle 24 is made different.
The reduction ratio of the entire transmission system to the right rear axle 30 is set smaller than the reduction ratio of the entire transmission system to the right rear axle 30.
Therefore, by selecting the direction of rotation of the rotary handle 12, it is possible to switch between a transmission state suitable for running on flat ground and a transmission state suitable for running uphill.

In other words, when driving on flat ground, when the rotary handle 12 is rotated backwards (indicated by the solid line arrow in Figure 3), the sprocket 25 of the left rear axle 24 is rotated forward, as shown in Figure 4. The sprocket 31 of the right rear axle 30 is rotated in the opposite direction, and the left unidirectional rotary clutch 33 operates to drive the left rear axle 24 forward, and the right unidirectional rotary clutch 34 idles, causing the left rear wheel to rotate. 5l, and the right rear wheel 5r
follows the forward movement of the vehicle and idles forward at the same speed as the left rear wheel 5l.

In this case, since the reduction ratio of the transmission system of the left rear wheel 5l is small, high-speed running is possible.

When driving uphill, when the rotary handle 12 is rotated forward (indicated by the dashed arrow in FIG. 3), the sprocket 31 of the right rear axle 30 is rotated forward, as shown in FIG. 5, contrary to the previous rotation. In contrast, the sprocket 25 of the left rear axle 24 is reversed, and the right one-way rotating clutch 3
4 is activated, the right rear wheel 5r is rotated forward at a large reduction ratio, and uphill running is possible with a light rotation of the rotary handle 12.

[Another example]

In the above embodiment, the turning handle 12 and the rear axle 2
Although the entire transmission system to 4 and 30 is constructed as a chain transmission system, it may also be constructed as a slip-free belt transmission system using a timing belt or the like. Further, a gear transmission portion may be incorporated into the transmission system, and furthermore, it is also possible to configure the entire transmission system as a gear transmission system.

Further, although the turning handle 12 in the above embodiment is manually operated, it may be operated by foot instead. In this case, the turning handle 12 is placed at a location on the vehicle body frame 1 corresponding to the operator's feet.

〔Effect of the invention〕

As explained above, according to the present invention, the transmission systems for the single turning handle 12 and the left and right rear wheels 5l, 5r are configured to have mutually opposite rotational directions, and the transmission systems for the left and right wheels are Since the one-way rotary clutches 33 and 34 are interposed to transmit only the forward rotational power to the rear wheels 5l and 5r, the rotation of the rotary handle 12 can be easily stopped when driving uphill. 1
By simply removing your hand or foot from the 2, the vehicle will automatically be prevented from moving backwards due to the mutual interlocking action of the left and right transmission systems that rotate in different directions, making emergency stops easy, quick and reliable when driving uphill. This greatly improves safety. Therefore, it is particularly effective as a three-wheeled bicycle for people with physical disabilities and the elderly.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of a three-wheeled bicycle according to the present invention, Fig. 2 is an overall plan view, Fig. 3 is a schematic perspective view of the entire transmission system, and Fig. 4 is a main part showing the transmission state when running on flat ground. FIG. 5 is an operational diagram of the main parts showing the transmission state when traveling uphill. 1...Vehicle frame, 3...Handle, 4...
Front wheel, 5l, 5r... Rear wheel, 12... Rotating handle, 33, 34... One-way rotating clutch.

Claims (1)

[Scope of Claims] 1. A front wheel 4 that can be freely steered by a handle 3 is provided at the left and right center of the front end of the vehicle body, and a pair of rear wheels 5l, 5r that are interlocked and connected to a turning handle 12 are provided on the left and right sides of the rear of the vehicle body. The transmission systems for the turning handle 12 and the left and right rear wheels 5l, 5r are configured to have mutually opposite rotational directions, and each transmission system for the left and right rear wheels 5l, 5r is configured to have only forward rotational power. One-way rotating clutch 3 that transmits the power to the rear wheels 5l and 5r
A three-wheeled bicycle characterized by having 3 and 34 interposed respectively. 2. The three-wheeled bicycle according to claim 1, wherein each transmission system of the rotating handle 12 and the left and right rear wheels 5l, 5r is configured as a wrap transmission system.