JPS5826869Y2 - Four-wheeled vehicle frame structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a four-wheeled vehicle frame structure, and more particularly, to a four-wheeled vehicle frame structure that can be folded into two.

Hereinafter, details of the present invention will be explained along with embodiments shown in the drawings.

Fig. 1 is a perspective view showing an example of a four-wheeled vehicle adopting the frame structure of the present invention. It is assembled based on the main rod 2 and the second main rod 3, which is also formed in a substantially U-shape.

One end of both main rods is rotatably connected by a pin 5 to a connecting rod 4 which is open downward and has a substantially U-shaped cross section, and the two together form an upper frame. are doing.

Near the rear end of the second main rod 3, there are connecting plates 6 on both sides thereof.
is fixed, and the upper end of the first auxiliary rod 1 is rotatably supported on each connecting plate 6 via a pin 8.
The lower ends of the auxiliary rods 7 are supported on the rear wheels 90 and the axles 10, respectively.

The reference numeral 11 is a second auxiliary rod formed in a substantially U-shape, and its rear end is supported on the axle 10 of the rear wheel 9 similarly to the first auxiliary rod I. It is rotatably supported by a pin 12 via a connecting rod 4 intersecting with the rod 2.

Therefore, the tip 11a of the second auxiliary rod 11 passes between the first main rods 2 and projects obliquely upward.

At the center of the tip of the second auxiliary rod 11, a handle pipe 13 is rotatably fitted and buttoned, and a connecting plate 14 is fixed to the side surface of this pipe 13.
A handle bearing 18b is fixed perpendicularly to the handle pipe 13.

The connecting plate 14 and the handle bearing 18b are connected to the handle shaft 1 to which the handle 16 is fixed at one end.
7 is slidably and rotatably fitted.

Note that it is also possible to place the handle shaft 11 and the main rod 2 close to each other, omit the part 11a, fix the handle pipe 13 directly to the main rod 2, and attach the handle bearing 18b thereto.

The tip of the handle shaft 1T is rotatably supported by a bearing 18a added to the center of the tip of the first main rod 2.

... The handle shaft 1γ has a portion near its tip located in a U-shaped bent portion 21 formed at the center of the tie rod 20 of the front wheel 19, which is rotatably supported with respect to the first main rod 2. It is rotatably supported on an axis.

Then, both ends of the tie rod 20 are connected to king pins 2, respectively.
It is rotatably connected to the axle 23 of the front wheel 19 via 2.

Therefore, if the knob 16 is rotated, the handle shaft 1
7, the tie rod 20 is rotated left and right, and the front wheel 19
can change direction and change direction.

On the other hand, a connecting rod 24 is rotatably supported on crank arms 25 formed at different phases on the axle 10 of each rear end 9, and the front end extends from the tip of the second auxiliary rod 11. It is rotatably connected to two U-shaped pedals 26 and 27 that are rotatably suspended.

What is indicated by the reference numeral 28 is a seat, which is made of cloth or the like.
It is fixed to the second main rod 3Vc.

Therefore, sit on this seat 28, stretch out both legs, and hit the pedals 26, 2γ! If you hit the tip and burn it back and forth, rod 2
4, the crank arm 25 is rotated, the rear wheel 9 is rotated, and the four-wheeled vehicle 1 starts running.

By the way, the positional relationship of the six rods is constructed as shown in FIG.

That is, the distance from the pin 12, which is the rotational fulcrum of the second auxiliary rod 11, to the pin 5, which is the rotational fulcrum of the second main rod 3, is a, and the distance from the pin 12, which is the rotational fulcrum of the second auxiliary rod 11, is a. The distance from 12 to the connection point of the axle 10 of the rear wheel 9 is b, and the distance from the pin 8, which is the rotation fulcrum of the first auxiliary rod 7, to the connection point of the axle 10 is C1, which is the rotation of the second main rod 3. from pin 5 which is the fulcrum
If d is the distance to pin 8, which is the rotational fulcrum of the auxiliary rod, each frame is always in the positional relationship of a + b = c + d,
The whole constitutes a quadrilateral link.

Therefore, if the second main rod 3 side is rotated downward around the pin 5, as shown in FIGS. 3 and 4, the second main rod 3,
The first and second auxiliary rods 7 and 11 can be bent and overlapped with the first main rod 2.

At this time, the handle bearing 18b rotates in a direction approaching the handle 16 side as the second auxiliary rod 110 rotates.

In this way, the rear wheels 9 of the four-wheeled vehicle 1 are positioned all the way to the front, and the four-wheeled vehicle 1 can be folded into two with the front and rear wheels aligned in parallel.

At this time, the rod 24 and pedals 26 and 27 are not bent, only by changing their positions.

As is clear from the above explanation, according to the present invention, the frames constituting the four-wheeled vehicle are connected from the middle to form a quadrilateral link. It can be folded, has a simple structure, and can provide a four-wheeled vehicle with small storage space.

[Brief explanation of the drawing]

The figures are for explaining one embodiment of the present invention, in which Fig. 1 is an overall perspective view, Fig. 2 is a schematic configuration diagram shown as a skeleton, and Fig. 3 is a schematic diagram showing the structure as a skeleton.
FIG. 4 is an explanation of the operating state. 1... Four-wheeled vehicle, 2... First main rod, 3.
...Second main rod, 4...Connection rod, 5,8.
12... Pin, 1... First auxiliary rod, 1
1...Second auxiliary rod, 13...Handle pipe, 18b...Handle bearing, 1T...
...Handle shaft, 24...Rod, 25.
...Crank arm, 26.27...Pedal.

Claims (1)

[Scope of utility model registration request] A first main rod at the front and a second main rod at the rear are valveably connected via a connecting rod to form a main rod part, and one end of a pair of first auxiliary rods is attached to the rear of the second main rod. One end of the second auxiliary rod is rotatably attached to the first main rod, and the first and second
The other end of the auxiliary rod is connected to the rear wheel axle, a handle shaft is added to the first main rod, and the tip of the second auxiliary rod is supported by a bearing member that is slidably provided on the handle shaft. The length from the rotation fulcrum 12 of the second auxiliary rod to the rotation fulcrum 5 with the second main rod, and the length of the second auxiliary rod from the rotation fulcrum 12 to the connection point O with the rear wheel axle. The sum of is the length from the rotation fulcrum 5 of the second main rod to the rotation fulcrum 8 of the first auxiliary rod, and the length from the rotation fulcrum 8 of the first auxiliary rod to the connection point chamber of the rear wheel axle. A frame structure of a foldable four-wheeled vehicle, characterized in that the frame structure is configured to be equal to the sum of .