JPS5828951Y2 - folding bicycle - Google Patents

Description

[Detailed description of the invention] The present invention relates to a folding bicycle, and provides a bicycle that can be folded into a compact size with simple operation, yet exhibits sufficient strength, and is convenient for leisure use outside the field. It is intended to be made available to the public.

As a conventional folding bicycle of this kind, the Jikoko 52-
There is one described in Japanese Patent No. 47216.

In this vehicle, a main rod provided with a rear wheel and a seat tube intersect in an X-shape, and the intersection point is used as a fulcrum for both, and the lower end of the seat tube and the upper end of the main rod are extendable and retractable. They are connected by a connecting rod equipped with a friction locking device that can be fixed at any length, and furthermore, a front fork having a front wheel and a handle is rotatably supported by the connecting rod.

In this type, the length of the connecting rod can be adjusted arbitrarily, so by adjusting the degree of expansion and contraction of the connecting rod, the distance between the saddle and the pedals can be adjusted.

However, since the locking device for fixing the length of the connecting rod is a friction type, if the frictional force is insufficient, that is, if the locking device is not tightened enough, the load applied to the saddle may cause The connecting rod may shrink.

Such inconveniences (accidents) occur particularly when a shock is applied while driving.

The present invention has been devised in view of these points, and its object is to enable the main rod and the seat tube to be fixed mechanically, that is, in a state in which no slipping occurs during use.

The technical means of the present invention to solve the above problems is to make the upper end of the main rod slidable with respect to the handle shaft, and to connect the lower end of the main rod and the upper end of the seat tube to each other so as to be rotatable. The upper link is connected by a link and has a fulcrum on the seat tube side, and the upper part of the seat tube is fitted into the upper link to hold it, forming a U-shaped cross section that is open to the outside and prevents the seat tube from slipping out. This is because a means to prevent escape was provided.

According to the above technical means, when the escape prevention means of the upper link connected to the seat tube side is removed, the lower link connected to the link can be extended to a range corresponding to the sum of the lengths of both links, When the main rod and the seat tube are rotated in the upright direction, the upper end of the main rod moves up the handle shaft, and both ends of the main rod and seat tube approach each other, and the handle shaft can also be folded into a state close to them.

Next, when the main rod and seat tube are pushed apart, the two links connecting the lower part of the main rod and the upper part of the seat tube are folded, and the upper link approaches the upper part of the seat tube, and finally the The upper end of the Sea 1-IJ tube fits into the U-shaped cross section of the link, and the main rod and seat tube are held in an expanded state.

At this time, the load applied to the seat tube is connected to the main rod side.

Supported by downward links.

Further, when the escape prevention means is set to the escape prevention state, the seat tube is held in the upper link in a manner that prevents it from being removed, and is locked in the use state.

In this case, both ends of the lower link are mechanically and non-sliply fixed.

Therefore, there is no need to worry about the locking state loosening due to impact during driving, and accidents caused by loosening can be prevented.

The present invention has the following unique effects.

In the above-mentioned conventional device, when in use, the connecting rod that connects the upper end of the main rod and the lower end of the seat tube protrudes near the handlebar, which can sometimes get in the way when driving, but the above-mentioned structure of the present invention According to , there is no such connecting rod,
Since a locking device having the same function as this is located below the saddle, the above-mentioned inconvenience can be solved.

In the embodiment shown in FIGS. 1 to 3, reference numeral 1 denotes a main rod 1 having two tubular bodies arranged in parallel, and one end of which is fitted onto the handle shaft 2 and a support member 3 that can freely slide thereon. is pivoted by, on the other hand,
A rear wheel 4 is disposed at the free end and supported at both ends by the tip ends of the two tubes.

A stand 5 is fixed to the shaft support so as to be rotatable within an appropriate range at the same time.Furthermore, a tune wheel 6 having a crank, pedals, etc. is rotatably held in the center ε of the main rod 1, and a tune wheel 6 having a crank, pedals, etc. Tune transmission is carried out with the freewheel 7 provided at 4.

Next, 8 is a seat tube fixed rotatably at the intersection point 9 with the main rod and the lower part of the head tube 10;
The seat tube passes through two tubes that take over the main rod 1, and the seat tube and the main rod intersect in an X-shape.

Next, the vicinity of the tune wheel 6 holding portion of the main rod 1 and the upper part near the middle of the seat tube are connected by a bendable three-tube link, and the upper link 11 has a cross-sectional shape that can be externally fitted onto the seat tube 8. At the same time, one end of the link is pivotally supported by the seat tube, and furthermore, when the link is fitted onto the seat tube 8, the rotating tongue piece 12 provided on the negative side of the link rotates around the seat tube 8, as shown in FIG. It is possible to engage with the engaging portion 13 on the other side beyond this point.

Further, the lengths of the other link 14 and the above-mentioned link are set appropriately in advance, and as shown in FIG. 1, the link stands upright below the seat 15 when in use.

A front fork 16 is connected to the lower end of the head tube 10 and supports a front wheel 17. The front wheel is supported via a pair of arms 18, 1B, and the free ends of the arms and the front A cushion for the front wheel 17 is secured by interposing springs 19, 19 between the balks 16.

In the case of the above embodiment, it can be used exactly like a normal bicycle in the state shown in FIG. Since one triangular frame is formed by the handle shaft 2, the upper part of the main rod 1, and the lower part of the seat tube 8, the frame strength can be fully demonstrated. becomes.

Next, in order to fold this, the rotating tongue piece 12 on one side of the link 11 is removed from the engaging part 13 on the other side, and the seat tube 8 and the handle shaft 2 are brought closer to each other. is pivotally supported by a support member 3 that is slidable on the handle shaft 2, so as the support member moves upward, the main rod 1 and the seat tube 8 rotate around their intersection point 9, while supporting the handle shaft 2. close to.

Now, it is folded into the state shown in Fig. 2, but at this time, the link IL1464 is in the extended state, and the connecting part of the link 11.14 is in the state where the main rod 1, seat tube 8, and handle shaft 2 are closest 20 is located near the dead center of these links, and in this state, when the connecting portion is forcibly pushed in, it is positioned beyond the dead center and is easily locked in the folded state shown by the two-dot chain line in FIG. The folded state will not collapse.

Note that even in this folded state, the stand 5 and the front wheels 17 can make it stand upright.

Next, in order to use the state, the connecting parts 20 of the links 11 and 14 are forcibly pulled out to spread the handle shaft 2 and the seat tube 8, and the upper part 6 (IJ When the rotating tongue piece 12 on one side of the link 11 is engaged with the engaging portion 13 on the other side, the first
It is shaped as shown in the figure and ready for use.

The folding bicycle of the above embodiment can be folded and expanded with simple operations, and is compact when folded, so it can be stored in the trunk of a car and transported, and can be easily used in the suburbs. It can be used as a benefit dog.

Further, since the front wheel 17 is provided with a cushion device, a sufficiently good riding comfort can be obtained even in the bicycle according to the embodiment of the present invention using small wheels.

[Brief explanation of drawings]

Fig. 1 is a side view of the embodiment of the present invention, Fig. 2 is an explanatory view of the folded state, and Fig. 3 is a perspective view of the main parts. ...Supporting member, 8...
...Seat tube, 9...Cross point, 10
...Head tube.

Claims (1)

[Scope of utility model registration request] The rear wheel is arranged at the free end of the main rod 1, and the main rod is connected to the seat tube 8, one end of which is pivotally supported at the lower part of the head tube 10 connected above the front fork on which the front wheel is arranged, and the main rod. The upper ends of the main rods are slidable relative to the handle shaft, and the lower ends of the main rods and the upper ends of the seat tubes are connected to each other. It is connected by two links that are rotatably connected, and the upper link has a fulcrum on the seat tube side, and the upper link has a U-shaped cross section that is open to the outside and holds the upper part of the seat tube. , a folding bicycle in which the link is provided with an escape prevention means for preventing the seat tube from escaping.