JP2533537Y2 - Foldable bicycle frame - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle, and more particularly to a foldable bicycle frame.

[0002]

2. Description of the Related Art There have already been many proposals for bicycle frames that reduce the volume by being foldable, most of which are the structure of a small bicycle frame of 16 inches or 20 inches (tire diameter). This type of frame structure will certainly reduce its volume after it has been folded, but due to the small dimensions of the wheels, the dimensions and angles of a normal bicycle will not be obtained and its function will also be reduced Therefore, the ride comfort of a general 26-inch bicycle cannot be obtained.

Among the many prior art examples, a 26-inch foldable bicycle belonging to a mature design is described in US Pat. No. 4,448,437. The frame retains the traditional diamond shape structure, with a completely seat tube as the axis of rotation, but its drawback is that if it is folded,
Since the rear wheels are too far apart, the front wheels have to be removed, and when a frame is used, the fixing stability is not good. No. 4,579,3.
In the structure described in the specification of No. 60, when it is folded, its front and rear wheels do not need to be stacked and the front wheel needs to be removed, but the vehicle type is limited to that similar to a women's vehicle, In addition, since the connection between the front and rear frames is concentrated on one axle, the strength is not so high, and is suitable only for a city bicycle. Some other foldable bicycles have a good structure, but the structure is complicated and the manufacturing cost is high.

[0004]

[Problem to be solved by the invention] The main purpose of the invention is to maintain the shape and structure of the frame of the traditional diamond shape as much as possible, and when it is deployed and used, it will have dimensions and dimensions similar to a traditional bicycle. An object of the present invention is to provide a foldable bicycle frame which has an angle and a riding comfort, is robust and secure in structure, and is easy and easy to operate.
A second object of the present invention is to provide a collapsible bicycle frame having a triangular multipoint fixation and a long moment clamping structure, and having extremely high rigidity and strength when the frame is deployed and tightened.

[0005]

SUMMARY OF THE INVENTION To achieve the above objects, the collapsible bicycle frame of the present invention includes a front frame and a rear frame, wherein the upper frame or lower tube of the rear frame. The seat has a suitable length extending forward from both sides of the seat tube, and a pivoting part is attached to the end thereof. One end of the upper frame near the upper tube or the lower tube of the front frame is provided with a pivot shaft for attaching a pivoting part, and the rear end of the upper tube or the lower tube is fixed to the seat tube. The front and rear frames are fastened on their seat tubes with their pivoting pivots so that the frames can be fixed and ride on. The detailed structure, function and characteristics of the present invention will be fully understood by describing the following embodiment with reference to the drawings.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, as shown in FIGS. 1 and 2, a head tube 11 is attached to a bicycle frame 10. As shown in FIG.
・ Top tube (Top tube) 12 ・ Lower tube (Down tube)
tube, Seat tube 14, Bottom tube (BB tube) 15, Two fork tubes (Seat)
stay) 16, 2 fork tubes (Chain sta.)
y) The main parts such as 17 and seat post 19 are included. The CC line on the drawing is a line connecting the centers of the front and rear wheels of the bicycle, and the NN line is a CC line. Is the center line of the folding perpendicular to, and the line FF is
k) is the center line.

The bicycle frame 10 according to the present invention has the following differences from the known bicycle frame structure. At the rear end of the upper tube 12, there is provided a stopper part, that is, a vertical pipe 121. The internal diameter of the vertical pipe 121 is the same as the internal diameter of the seat pipe 14, and the center axes of the both pipes are also aligned. 19 can be inserted simultaneously. On the rear side of the top ends of the row tube 121 and the seat tube 14, there are provided clamps 122 and 142 used for fastening the seat column 19.

A turning shaft 123 is provided at one end of the bottom surface of the upper tube 12 close to the seat tube 14, and the turning shaft 123 is NN
Located on the line. The upper fork tubes 16A and 16B pass over the seat tube 14 from both sides, and an upper pivoting part 161 is provided at the front end thereof. A turning shaft 123 is provided at the front end of the upper pivoting part 161.
A shaft hole is provided which is mounted on the upper shaft so that the shaft can be rotated. The shaft hole is fastened to the bottom end of the rotating shaft 123 with a positioning member 124. Parts 161 can be combined and turned around.

A turning shaft 18 is provided at one end of the bottom surface of the lower tube 13 close to the seat tube 14, and the turning shaft 18 is a hollow straight tube, which is located exactly on the line NN, and whose top end is a lower end. It is fixed to the bottom surface of the tube 13, and its bottom end passes through the fixing block 151 on the front side of the bottom tube 15, and then the positioning component 1
It is fixed to the bottom end of the turning shaft 18 by 81 and has a dual use of the turning shaft and the support column. A lower pivoting part 171 is provided at the tip of the lower fork tube 17, and the lower pivoting part 171 has a structure similar to that of the upper pivoting part 161.
A shaft hole is provided at the top end of the shaft 8 so as to be pivotable about the NN line. A stopper block 131 is provided at the rear end of the lower tube 13, and a stopper 141 is also provided on the front side surface of the seat tube 14 relatively.
The abutment block 131 and the stopper 141 are formed in an appropriate shape and are fitted to each other. If necessary, a screw or a positioning pin is provided to fix the both. What should be particularly described here is that the lower pipe 13 is illustrated in the drawing.
And the lower fork 17 are located on two parallel lines. However, the same effect can be obtained even if the intersection of the lower 13 and the lower fork 17 is shifted to the lower side so that both have a certain angle. It belongs to the implementation method which has.

As described above, the bicycle frame 10 is divided into a front frame A by a head tube 11, an upper tube 12 and a lower tube 13.
The rear frame B is constituted by the seat tube 14, the bottom tube 15, the upper fork tube 16, and the lower fork tube 17. Between the front frame A and the rear frame B, the upper pivoting part 161 and the rotating shaft 123, the lower pivoting part 171 and the rotating shaft 18 provide N-
It pivots with the N line, and furthermore, the positioning parts 124 and 181
And assembled with the bicycle frame.

Next, the situation when the foldable bicycle frame 10 of the present invention is used will be described. When used as a bicycle without being folded, as shown in FIG. 1, this foldable bicycle frame has a NN line as a rotating shaft, and a seat column 19 is inserted into a row tube 121 and a seat tube 14, and tightened. Gold 122, 142
Is tightened to fix the seat post 19, the front frame A and the rear frame 1B do not rotate, and can be used normally. What should be emphasized here is that the tightened structure of the front frame A and the rear frame B is formed as two triangular fixed structures. That is, it is formed into a triangle abc and a triangle def shown in FIG. 1, and the fixing method of the two triangles is stronger than that of a conventional one-point or two-point fixing structure, and the front frame is formed by an extremely large moment. In addition, the shift and the slack of the rear frame can be prevented, so that the bicycle frame can have good rigidity.

When folded and carried or carried, as shown in FIG. 2, when the frame is folded, first the two clamps 122 and 142 are loosened. Since this is a common quick release structure, the use of tools is not required, and the front frame A and the rear frame B can be centered around the turning shafts 123 and 18 by pulling out the column 19, that is, the NN line. Can be folded around. Seat pillar 1
If the front tube 9 is inserted into the seat tube 14 and the front tube is turned rearward, the axes of the front and rear wheels substantially coincide with each other.

As can be seen from the above description, when the bicycle frame of the present invention is used in a folded or unfolded state, the operation is extremely simple and quick, the structure is robust and safe, and Making the seat pillar 19 a locking pin not only avoids the risk of the frame being ridden without being tightened, but also lowers the height of the saddle of the folding frame, thus reducing the practicality. It can be said that it is a design that fits.

Next, FIGS. 3 and 4 will be described. The foldable bicycle frame 20 also has basic structures such as a head tube 21, an upper tube 22, a lower tube 23, a seat tube 24, a bottom tube 25, two upper fork tubes 26, and two lower fork tubes 27. The C--N--N--N--F--F lines are included in the same relationship as in the previous embodiment, but the difference between the above-described embodiment and the frame of this embodiment is as follows. .

At the rear end of the upper tube 22, there is provided a stopper member, that is, a vertical tube 221.
, And a clamp 242 is also provided at the top end of the seat tube 24 relatively. Seat tube 24 at the bottom of upper tube 22
A rotating shaft 223 is provided at one end near the rotating shaft 2.
23 is located on the NN line and has two fork tubes 26
The upper pivotal connection part 261 is attached to the tip of. The upper pivoting part 261 is pivotally connected to the turning shaft 223 and the turning shaft 22
A positioning component 224 for preventing the upper pivoting component 261 from dropping can be provided at the bottom end of 3. The bottom end of the seat tube 24 is located on the NN line,
A short shaft 241 is provided to allow the two to rotate relative to each other for the fitting of 31.

The above-mentioned head tube 21, upper tube 22, and lower tube 23 constitute a front frame A, and a seat tube 24, a bottom tube 25,
The upper frame 26 and the lower tube 27 constitute a rear frame B. Since the front frame A and the rear frame B are centered on the rotation axis 223 and the short axis 241, they can relatively rotate.

Next, the use condition of the frame of this embodiment will be described. Unfolded state As shown in FIG. 3, when the frame is expanded and in use, as shown in FIG. 3, after aligning the upright pipe 221 with the seat pipe 24, the seat pillar 19 may be inserted and tightened, without using a tool. Also, the lower tube 23, the seat tube 24, and the bottom tube 25 can be fastened and fixed. This bicycle frame is also triangle a
Since a multipoint tightening of bc can be obtained, a rigid frame having a sturdy structure can be obtained.

Folded state As shown in FIG. 4, when the frame is folded,
If the user loosens 22, 242 and removes the column 19, the front frame A rotates around the turning shaft 223, the rear frame B rotates around the short shaft 241 and the front and rear frames are folded. Operation is extremely simple and convenient.

Next, FIGS. 5 and 6 will be described.
These figures show a frame of a third embodiment of the present invention, which includes a head tube 31, an upper tube 32, a lower tube 33, a seat tube 34, a bottom tube 35, and two fork tubes 36, 2. Fork tube 37
For example, parts similar to those described above are included. Among them, the method of pivoting the upper pivoting part 361 and the turning shaft 323 is the same as the corresponding parts 161 and 123 shown in FIG.
Lower hanger tube 331 attached to the bottom end of seat tube 34
Is the same as the lower vertical pipe 231 shown in FIG. The difference from the previous embodiment is that the rear part of the upper tube 32 is inclined downward and made as a women's motorcycle (Lady Bike),
A rotating shaft 323 is provided below the rear end, and extends further upward to become an elongated tube 32a.
1 is provided, and the connecting pipe 341 is provided with a semicircular opening 342 so as to allow the placing of the vertical pipe 342. Details are shown in a partially enlarged view of FIG.

The method of folding the front frame A and the rear frame B is the same as that of the above-described embodiment. If the front frame A and the rear frame B are not folded, the overlapping pipe 321 is connected to the connecting pipe 341.
And the seat column 19 is simultaneously inserted into the seat tube 34 and the upright tube 321 so that the front and rear frames are firmly fixed. As shown in FIG. Has a fixed structure. When the frame is folded, as shown in FIG. 6, the frame can be folded just by pulling out the seat pillar 19, so that it can be said to be a modified embodiment having the same function as the above-described embodiment.

However, the drawings described above are used for describing the embodiments of the present invention, and do not limit the present invention, and other modified embodiments having the same functions can be implemented. For example, since the pivoting structure or the abutment structure is used for other pivoting methods having the same function, the present invention is implemented as a frame having the same function as that described in the above-mentioned utility model registration claim. can do.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a use state of a foldable bicycle frame according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a state in which the frame of FIG. 1 is folded.

FIG. 3 is a view illustrating a use state of the foldable bicycle frame according to the second embodiment of the present invention;

FIG. 4 is a view showing a state in which the frame of FIG. 3 is folded.

FIG. 5 is a diagram illustrating a use state of the foldable bicycle frame according to the third embodiment of the present invention.

FIG. 6 is a diagram showing a state in which the frame of FIG. 5 is folded.

FIG. 7 is an enlarged perspective view showing a part of the components shown in FIG. 6;

[Explanation of symbols]

 10, 20 ... frame 11, 21, 31 ... head tube 12, 22, 32 ... upper tube 13, 23, 33 ... lower tube 14, 24, 34 ... seat tube 15, 25, 35 ... bottom tube 16, 26, 36 ... Upper fork pipes 17, 27, 37 ... Lower fork pipes 18 ... Rotating shaft 19 ... Columns 121, 221, 321 ... Cross pipes 122, 142, 222, 242 ... Clamps 123, 223, 323 ... Rotating shaft 131 ... Stop block 141 ... Stopper 151 ... Fixed block 161, 361 ... Upper pivot part 171 ... Lower pivot part 231, 331 ... Lower pipe 341 ... Connection pipe 342 ... Semicircular opening A ... Front frame B ... Rear frame NN: Center line of folding

Claims (6)

(57) [Scope of request for utility model registration] 1. A front frame constituted by a head tube, an upper tube, and a lower tube, a seat tube, a bottom tube, two fork tubes, and a front tube.
A rear frame constituted by a book fork tube,
The upper tube and the lower tube of the front frame are each pivotally connected to the rear frame via a turning shaft, and are fitted to the upper end of the seat tube where the upper tube of the front frame and the seat tube of the rear frame are joined. There is a stopper part to be
At an appropriate position at one end of the upper pipe near the seat pipe, a turning shaft is provided, and the tip of two upper fork pipes or two lower fork pipes exceeds the seat pipe, and the tip thereof is A pivoting part is provided for pivoting on the pivot axis of the front frame, the front frame and the rear frame being relatively rotatable about these pivot axes and having a certain distance from the pivot axis. A foldable bicycle frame, wherein the bicycle frame is fixed by fitting a stopper member at a rear end of the tube with a seat tube. 2. A hoop tube is provided at the rear end of the upper tube, and the hover tube can be inserted with a seat column at a position coaxial with the seat tube, and the tip of the fork tube is a seat tube. , The tip of which is pivotally connected to the lower turning shaft of the upper tube, the tip of the fork tube crosses the seat tube, and the tip of which is pivotally connected to the lower turning shaft of the lower tube. That the front and rear frames are pivoted together,
The foldable bicycle frame according to claim 1, wherein the frame is adapted to be relatively rotatable. 3. A top tube is provided at the rear end thereof with a top tube, and the top tube can be inserted with a bottom post at a position coaxial with the bottom tube. Beyond
The tip is pivotally connected to the lower turning shaft of the upper pipe, and the lower end of the seat pipe is perpendicular to the line connecting the centers of the front and rear wheels, and is pivotally connected to the lower pipe. 2. The front frame and the rear frame are combined with each other so that the rear end of the lower tube is fixed to the lower vertical tube so that the front frame and the rear frame can be relatively rotated. Foldable bicycle frame. 4. The collapsible bicycle frame according to claim 2, wherein a bottom end of a shaft pivotally connecting the rear end of the lower tube and the rear frame to each other is provided on a front side of the bottom tube. . 5. The foldable bicycle frame according to claim 1, wherein a portion between both ends of the upper tube of the front frame is bent downward. 6. A connecting pipe is provided on the seat pipe,
2. The collapsible bicycle frame according to claim 1, wherein the connecting tube is provided with a semicircular opening into which the upright tube can be inserted.