JPS63188586A - Frame for bicycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] "Industrial application field" TECHNICAL FIELD The present invention relates to a bicycle frame.

``Prior art'' The driving force of conventional general bicycles is transmitted by a chain, and the bicycle frame is made of metal such as cast 1 alloy for strength, and the frame itself cannot be given elasticity, so air By using double-sided tires and providing a spring in the saddle, the seat has cushioning properties (elasticity), which improves riding comfort.

``Problems to be Solved by the Invention'' However, although conventional bicycles have pneumatic tires and a spring-loaded saddle to provide cushioning to the seat, the cushioning is not sufficient. However, there was a problem of insufficient ride comfort.

The present invention uses an elastic frame to
The object of the present invention is to provide a bicycle frame that solves the above-mentioned problems of conventional bicycle frames.

``Means for Solving the Problems j'' In order to achieve the above object, the present invention has the following configuration. Namely, the upper parts are connected to form a figure 8 shape, and the wheels extend downward across the front wheels. , a front fork whose lower end is attached to the center of the front wheel to allow rotation of the front wheel, a knob integrally provided at the upper end of each of the front forks, and a space between the upper parts of the front fork. a transverse frame having elasticity, one end of which is rotatably attached to the frame, and the other end of which is attached to the center of the rear wheel through a bracket provided at the other end to allow rotation of the rear wheel; and a seat pillar extending upward from the other end of the horizontal frame to attach the saddle to the upper end.

``Function'' The frame has elasticity, which improves riding comfort, allows the use of cushion solid tires, reduces running resistance and required driving force, and allows the use of frames made of lighter materials, making the entire bicycle lighter. do.

"Embodiment" An embodiment of the present invention will be described below with reference to FIGS. 1 to 8. Reference numeral 1 in FIG. 1 is a bicycle frame, and this bicycle frame l has a pair of front horns 2. A pair of handles 3. It has a general configuration consisting of a horizontal frame 4 and a seat pillar 5. 6 is a front wheel, and 7 is a rear wheel.

Front wheel6. Cushion solid tires are fitted on the rims of the rear vehicle 7, and annular grooves 6a and 7a are provided in the center of the outer peripheral surface of these cushion solid tires in order to reduce the ground contact area. ing. A plurality of these annular grooves 6a, 7a may be provided in the width direction of each cushion solid tire. The reason why the tires are cushion solid tires, that is, solid tires, is that, as will be described later, the driving force of the bicycle can be transmitted to the wheels much more efficiently than before, and the frame 1 can be made lighter. Since we were able to make l elastic,
This is because there is no longer a need to use pneumatic tires, and the reason why the cushion solid tires are provided with annular grooves 6a and 7a is to reduce the contact area, and when the tire rides on a pebble, it can be used to move the pebble aside. This is to prevent the cushion solid tire from being flipped sideways by the pebbles, as well as to prevent the cushion solid tire from being flipped sideways by the pebbles, thereby impairing running performance.

The pair of front forks 2 are connected at a slightly lower part of the upper end by a connecting plate 2a as shown in FIGS. 4 and 5.
It is formed in the shape of a letter and extends downward with the front wheel 6 in between, and its lower end is attached to the central axis 8 of the front wheel 6 to allow rotation of the front wheel 6. Also, front hawk 2
is further inclined with respect to a vertical line passing through the center of the front wheel 6 so that its upper portion is located on the rear wheel 7 side.

The handle 3 consists of a handle par 3a integrally provided at the upper end of the front fork 2 and a grip portion 3b provided at the tip of the handle par 3a. As shown in FIGS. 1 and 2, the handlebar 3a is tilted forward and curved from side to side when viewed from the front of the bicycle, forming a substantially inverted V-shape, with its upper end bent toward the rear wheel. There is. As a result, the handle 3 has a shape that is easy to operate and has a good appearance.

As shown in FIGS. 1 and 3, the horizontal frame 4 is shaped like an elongated plate, and the thickness of the central portion thereof is slightly thicker than that of both ends. A mounting hole 9 is formed at two ends of the horizontal frame 4, and a groove 10 is formed at the other end, and bracket plates 11a and 11b consisting of a pair of parallelogram plates facing each other are arranged in a hanging shape. It is provided.

The horizontal frame 4 as a whole is curved into an arch, and is divided into two parts approximately in the middle thereof, and the divided parts are shown in FIGS. 1 and 3 by hinges 4i and 4b.

The bracket 4c, bolts 4d, nuts 4e and other connecting members connect the bracket 4c in a foldable manner, and by removing the bolts 4d and nuts 4e from the bracket 4c, the hinge 4a
, 4b, the side portion of the front wheel 6 can be rotated in the direction of arrow A shown in FIG. 1 relative to the side portion of the rear wheel 7. 4f is a spacer.

As shown in FIG. 4, one end of the horizontal frame 4 is sandwiched between a bearing 13 housed in a bearing holder 12 and a bearing 15 covered by a bearing cover 14, and these connecting plates 2a.

Bearing holder 12. Bearing 13, 15° horizontal frame 4. It is rotatably attached to the connecting plate 2 by bolts I6 and nuts 17 passed through the bearing cover 14. After the nut 17 is screwed onto the bolt 16, it is prevented from rotating by generally well-known means.

14a is an O-ring.

The pair of bracket plates 11a provided at the other end of the horizontal frame 4 are provided at the other end of the horizontal frame 4.

11b and a central shaft 18, the rear wheel 7 is rotatably attached. The central axis 18 is a bracket plate 11a,
The rear wheel 7 is fixedly attached to the central shaft 1 through the hub of the rear wheel 7 fitted to the central shaft 18.
It is rotatably attached to 8.

The pair of bracket plates 11a and ll'b each have a driving device 19. a and 19b are attached.

One drive device 19a is constructed as shown in FIGS. 6 to 8. That is, both bracket plates 11a, l
The center shaft 18 fixed to the rear wheel 7 has a small diameter iron (magnetic material) connected to the hub provided at the center of the rear wheel 7 so as to coaxially rotate with the hub. A wheel 20 is loosely fitted.

There is iron (
A fan-shaped arm 21 made of a magnetic material is provided. A point corresponding to the key point of the fan of this fan-shaped arm 21 is located on the front wheel 6 side of the wheel 20, and a point corresponding to the key point of the fan is attached to the bracket plate lla.
It is rotatably attached via a shaft 21a and a bearing 21b provided at a.

An engaging portion (magnetic material) 22 made of iron in the shape of a circular arc plate is provided on the outer periphery of the fan-shaped arm 21, and this engaging portion 22 is made of thin asbestos, rubber, etc. have. Further, the fan-shaped arm 21 has a shaft 21a which is the center of rotation thereof, and the wheel 20.
A long hole 21c is provided between the two. This fan-shaped arm 21 has a circular arc hole 21 located between the elongated hole 21c and the engaging portion 22 and located on a circular arc centered on the shaft 21a.
d is formed.

In addition, a magnet (permanent magnet) 23 made of laminated discs is installed at a predetermined location between the wheel 20 and the engaging portion 22 of the fan-shaped arm 21. It is intervening by being magnetically attached to it. This magnet 23 has a smaller diameter than the wheel 20.

Further, a base end portion of a pedal arm 25 is rotatably attached to the center shaft 18 via a bearing 24 . The pedal arm 25 is provided on the opposite side of the wheel 20 to the sector arm 21.

An interlocking pin 27 is fixedly attached to a predetermined location near the base end of the pedal arm 25. The interlocking pin 27 protrudes toward the bracket plate 11a and is inserted into a long hole 26 formed in the bracket plate 11a. It is loosely fitted into the long hole 21c of the H-shaped arm 21.

A pedal 28 is rotatably attached to the tip of the pedal arm 25.

Further, a spring (spring) 29 is loosely fitted to the shaft 21a fixed to the bracket plate 11a, one end of the spring 29 is attached to a predetermined location of the sector-shaped arm 21, and the other end is attached to a predetermined location of the bracket plate 11a. is attached to. This spring 29 is attached so as to bias the pedal arm 25 upward when the pedal 28 is depressed with less pedal force.

The drive device 19b on the right side when viewed from the front of the bicycle (the right side in FIG. 2) is configured similarly to the drive device 19a on the left side when viewed from the front of the bicycle (the left side in FIG. 2). It is attached symmetrically to 19a. These drive devices 19a and 19b rotate the wheel 20 via the fan-shaped arm 25 and the magnet 23 by alternately stepping on the left and right pedals 28 when viewed from the front of the bicycle.
As a result, the rear wheel 7, which is provided to be rotatable integrally with the wheel 20, is driven to rotate. pedal 2
8, the pedal 28 will rise via the pedal arm 25 due to the force of the spring 29.If you put your feet on both pedals 28 and do not apply any particular pedal force, the magnet 23's wheel 20. The biting force between the engaging portions 22 is eliminated, so that the bicycle can run with its remaining power.

Further, a saddle 30 is attached to the upper end of the seat baler 5. 31 is an illumination light attached to the connecting plate 2a of the front fork 2.

Next, the operation of the bicycle frame of the present invention constructed as described above will be explained.

When riding a bicycle and driving the bicycle, the pedals 28 of the drive device 19a and the pedals 28 of the drive device 19b are used.
Step on alternately. That is, the pedal 2°8 of the drive device 19a
is rising to the rising limit position r! 3 (at this time, the pedal 28 of the normal drive system ri 19b has been lowered to the lowering limit position). When this pedal 28 is depressed, the pedal arm 25 moves in the direction of arrow B in FIG.
The interlocking pin 27 presses the lower part of the inner surface of the elongated hole 21c downward. Then, the fan-shaped arm 21 rotates about the shaft 21a in the direction of the arrow Cl in FIG.

Then, the magnet 23 magnetically attached to the wheel 20 and the engaging part 22 is rotated in the direction of arrow E in the figure by the lining member 22a of the engaging part 22 and bites into between the lining member 22a and the wheel 20. A large torque is transmitted to this wheel 20 to rotate the wheel 20 in the direction of arrow F in the figure.

As a result, the rear wheel 7 rotates in the same direction as the wheel 20 via the hub of the rear wheel 7, which is provided to be rotatable integrally with the wheel 20.

Therefore, the front wheel 6. The bicycle of this embodiment runs due to the friction between the rear wheel 7 tire and the road surface.

During this time, the force with which the pedal 28 of the drive device 19b is depressed is normally relaxed, and the pedal arm 25 of the drive device 19b rotates about the central axis 18 in the direction of arrow G shown in FIG. 6 due to the force of the spring 29. , the pedal 28 reaches its upper limit position.

Here, if the pedal 28 of the drive device 19b is stepped on, the pedal arm 25. Interlocking pin 27. B-shaped arm 21. magnet 23
．． The rear wheel 7 rotates via the wheel 20 and the like in succession to the rotation of the rear wheel 7 when the pedal 28 of the drive device 19a is depressed.

When this bicycle is running, the wheels 20. The magnet 2 is caused by the magnet 23 biting into the space between the lining members 22a of the engaging portion 22.
Since the torque transmission force to the wheel 20 of No. 3 is strong,
The conventional chain drive transmission becomes unnecessary. This allows the bicycle body to have a simple structure, making it possible to construct the bicycle frame 1 from lightweight materials, and as a result, the transverse frame 4. The seat pillar 5 can be made of a lightweight elastic member, which greatly improves riding comfort compared to the conventional one, and the front wheels 6. It is even possible to use a cushion solid tire as the tire for the rear wheel 7, and by using this cushion solid tire, the ground contact area of the tire is significantly reduced compared to before, and as a result, the running resistance is reduced and the required driving force is reduced. This greatly reduces the effort required by the bicycle rider to drive the bicycle. .

Further, according to this embodiment, the cushion solid tire 6
b, 7b are provided with annular grooves 6a, 7a,
When a tire runs on a pebble, it can prevent the pebble from being flipped sideways, and it also prevents a solid tire that has rested on a pebble from being repelled sideways by the pebble, impairing the running performance of the bicycle. can be made significantly better than before.

Further, the bicycle of this embodiment has bolts 4d of the horizontal frame 4.
, remove the nut 4e and remove the hinge 4a.

By folding the front wheel 6 by rotating the front wheel 6 side relative to the rear wheel 7 side about the axis 4b in the direction of the arrow in FIG. 1, the entire bicycle becomes compact and convenient for transportation and parking arrangement.

In the above embodiment, the front half and the rear half of the horizontal frame 4 are connected rotatably around the axes of the hinges 4a and 4b, but the present invention is not limited to this, and the horizontal frame can be connected by a single plate. may be formed.

"Effects of the Invention" According to the present invention, the upper part is connected to form an H-shape,
a front fork extending downward across the front wheel and having a lower end attached to the center of the front wheel to allow rotation of the front wheel; a handle integrally provided at the upper end of each of the front forks; One end is rotatably attached between the upper parts of the front fork, and the other end is attached to the center of the rear wheel via a bracket provided at the other end to allow rotation of the rear wheel. The structure is simple, consisting of a transverse frame with an elastic frame and an elastic seat pillar extending upward from the other end of the frame to attach a saddle to the upper end of the seat pillar. The body is lighter, which in turn makes the entire bicycle lighter, and the horizontal frame and seat pillar are made of elastic materials, making the ride much more comfortable than before.The tires on the front and rear wheels are cushion solid tires. By using this cushion solid tire, it is possible to reduce the ground contact area and reduce running resistance, which in turn reduces the required driving force, which greatly reduces the effort of the cyclist to drive the bicycle. can be reduced.

[Brief explanation of the drawing]

1 to 8 show an embodiment of the present invention,
Figure 1 is a side view, Figure 2 is a front view, Figure 3 is a perspective view of the horizontal frame, Figure 4 is a sectional view of the main part, Figure 5 is a perspective view of the main part, and Figure 6 is the drive device. FIG. 7 is a partially cutaway sectional view of the drive device, and FIG. 8 is a rear view of the drive device. l... Bicycle frame, 2... Front fork, 3... Handle, 4...
Horizontal frame, 5... Seat pillar, 6...
...Front wheel, 7...Rear wheel, lla. flb...Bracket plate, 19a, 19b...
... Drive device, 20 ... Wheel, 21.
...Fan-shaped arm, 23...Magnet (permanent magnet), 30...Saddle.

Claims (1)

[Claims] A front fork whose upper part is connected to form an H-shape, extends downward across the front wheel, and whose lower end is attached to the center of the front wheel to allow rotation of the front wheel; and each of the front forks. One end is rotatably attached between a handle integrally provided at the upper end and the upper part of the front fork, and the other end is attached to the center of the rear wheel via a bracket provided at the other end. and an elastic seat pillar extending upward from the other end of the horizontal frame for attaching a saddle to the upper end of the seat pillar. bicycle frame.