JP3049135U - Foldable bicycle frame - Google Patents

Abstract

(57) [Problem] To provide a folding bicycle frame capable of easily and small folding a bicycle frame. SOLUTION: A bicycle frame is placed on an upper tube 1 of a vertical tube.
A first connecting rod set in which an upper tube front section 3 and an upper tube rear section 4 are connected by a first serial connecting device 5 to a vertical tube including a vertical tube lower stage 12 and a bending device 2;
A first connecting rod and a sheet tube 6 connected to the first connecting rod set, and a second connecting device 9, a second connecting rod set connected to the first connecting rod, and one end connected to the first connecting rod, The other end is composed of a second connecting rod set and a second connecting rod 10 connected to the second connecting rod set, and the bending device 2, the first serial connecting device 5, and the second connecting device 9 are adjusted to adjust each of the connecting rods. By rotating each connecting rod set, the frame can be folded small.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a foldable bicycle frame, and more particularly to a foldable bicycle frame that provides flexibility in folding and a reduction in the size of the frame.

[0002]

[Prior art]

 Conventional foldable bicycle frames generally include: A front frame composed of a front tube, an upper tube, and a lower tube; and a rear frame composed of a seat tube, a bottom tube, an upper fork, and a lower fork. Normally, connecting parts such as convex pressure rods, fixing plates and connecting pipes and the parts of the front frame and the rear frame are connected, and it is necessary to connect and rotate each other and to fold the frame. Tighten or loosen the articulation device to remove the articulation tube to achieve the purpose of folding the bicycle frame.

[0003]

[Problems to be solved by the invention]

 The structure of the conventional folding bicycle frame that combines the front frame and the rear frame is not yet perfect, that is, the conventional bicycle frame has the purpose of folding the frame by installing many connecting devices on the front frame and the rear frame. Achieve. However, the disassembly process of the connecting device is difficult, and the folding angle makes it difficult to fold. At the same time, even after folding, the bicycle frame is large, so there are problems in storage.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, the folding bicycle frame of the present invention has a vertical tube divided into an upper tube and a lower tube. The vertical tube can be stretched or bent by adjusting the bending device, and the upper tube is located at the front and the upper tube is located at the rear. The first connecting rod set composed of the first series connecting device connects the first stage of the upper tube and the second stage of the lower tube with the first series connecting device, and extends or bends the first connecting bar set by adjusting the first series connecting device. And the first connecting rod and the seat tube are connected to the first connecting rod set, the first connecting rod rotates with the first connecting rod set, and the second connecting rod set is connected to the first connecting rod. The second connecting rod set rotates relative to the first connecting rod, the second connecting rod set further comprises a second connecting device, and the second connecting device is adjusted. The second connecting rod set can be extended or bent, one end of the second connecting rod is connected to the first connecting rod, the first connecting rod and the second connecting rod rotate with each other, and the second connecting rod One end is connected with the second connecting rod set, the second connecting rod set and the second connecting rod can rotate with each other, and the above-mentioned frame structure can adjust the bending device, the first connecting device and the second connecting device. Thus, the connecting rod and the connecting rod set can be rotated and folded small.

[0005]

[Embodiment of the invention]

 As shown in FIG. 1, the folding bicycle frame of the present invention is generally composed of a standing tube, a two-stage upper tube, an upper tube front stage 3 and an upper tube rear stage 4, and a first serial connection device 5. A connecting rod set, a first connecting rod constituting the seat tube 6, a two-stage rear fork, a second connecting rod set including a rear fork front 7, a rear fork rear 8, and a second connecting device 9; It includes a second connecting rod that constitutes the fork lower tube 10, and these are combined with each other. The configuration and connection method of each part described above are as follows. The standing tube is composed of a standing tube upper stage 11 and a standing tube lower stage 12. A handle 111 is connected to one end of the standing tube upper stage 11, and a bending device 2 and a standing tube lower stage 12 are combined at the other end. ing. A front fork 121 is connected to the other end of the standing tube lower stage 12, and a front wheel 1211 is connected through the front fork 121. The head portion 14 is connected to the lower portion of the standing tube 12 and the upper portion of the front fork 121.

The folding device 2 is composed of a first upper one 21 and a second upper one 22, and a telescopic insertion device 23 (see FIGS. 14 to 18). Also, the vertical lower tube 12 and the second upper one 22 are connected to each other, and both the first and second upper ones 21 and 22 have two rotation holes 212 and 222, respectively, to serve as rotation axes. Immediately after the two fixing holes 211 and 221 are extended, the two fixing holes 211 and 221 are connected to the rotation holes 212 and 222 by the insertion 24. In addition, the insertion 24 is an axis for rotating and bending the upper tube 11 of the standing tube and the lower tube 12 of the standing tube, and the fixing holes 211 and 221 are connected by a telescopic insertion device 23 so that the standing tube upper stage 11 and the standing tube lower stage 12 are extended. At the time of fixing, the fixing holes 211 and 221 make the upright tube upper stage 11 and the upright tube lower stage 12 a coaxial, straight and rigid structure. The telescopic insertion device 23 includes a tubular body 231, two rod-shaped insertions 232, 232, two levers 234, 234, and an elastic body 233 (shown in FIG. 18). And the port is located at a position corresponding to the fixing holes 211 and 221. Openings 2311 and 311 are provided at both ends of the tubular body 231, and the outer ends of the rod-shaped insertions 232 and 232 form oblique cuts 2321, respectively. The elastic body 233 is inside the tubular body 231 and is between the two rod-shaped inserts 232 and 232. The lever 234 is embedded in each of the two rod-shaped insertions 232 and 232 so that the levers 234 and 234 can reciprocate in the openings 2311 and 2311, respectively. The elastic body 233 has elasticity, and after the two rod-shaped insertions 232 are pushed in and the vertical tube upper stage 11 and the vertical tube lower stage 12 are bent, the two rod-shaped insertions 232 and 232 are returned to their original positions. When the upper tube 11 and the lower tube 12 are in the straightened state, the levers 234 and 234 have strong forces due to the oblique cuts 2321 and 231 formed at the outer ends of the two right and left rod-shaped insertions 232 and 232. This makes it possible to automatically slide into each other without having to insert them, thereby eliminating unnecessary labor and eliminating the inconvenience of the fixing device.

Accordingly, when the two levers 234 and 234 are brought closer to each other by the pressing force of the external force F1 (see FIG. 17), the two rod-shaped insertions 232 and 232 are connected to the two fixing holes 211 and 211 of the first upper one 21. Respectively, the first upper one 21 and the second upper one 22 are separated from each other, and the upright tube upper stage 11 and the upright tube lower stage 12 are bent each other around the rotation holes 212 and 222. When the standing tube upper stage 11 and the standing tube lower stage 12 return to the upright position, the two rod-shaped insertions 232 and 232 are respectively moved by the elasticity of the elastic body 233 inside the telescopic pushing device 23 included in the folding device 2. The first and second upper ones 21 and 22 are automatically inserted into the fixing holes 211 and 221, and the upright tube upper stage 11 and the upright tube lower stage 12 form one solid structure. A hole 223 is provided at the center of the protruding portion of the second upper one 22, and is used for draining the inside of the upper tube 11 and the lower tube 12 having a hollow structure. The front connecting joint 13 is welded and fixed on the head portion 14 (see FIGS. 4 and 5), and a U-shaped mounting 131, a rotary orientation device 132 and a quick lever 133 are shown in the figure. The U-shaped part of the U-shaped mounting member 131 is welded onto the head part 14, and the opening part is connected to the rotation positioning device 132 and the upper tube front stage 3. The rotation localization device 132 includes two localization positions A and B, a rotation connector 1321, and a device for localization operation. The fixed point positions A and B are used to set the limit of the relative rotation between the upper tube front section 3 and the head section 14. In addition, the quick lever 133 gives a necessary tightening force to the rotation positioning device 132. In the first connecting rod set, the upper tube front section 3 and the upper tube rear section 4 of the two-stage type upper tube formed in a cylindrical shape are connected by a first serial connection device 5. The upper tube front section 3 and the head section 14 are connected to each other by a rotary connector 1321 of the front connecting joint 13 and perform relative rotational movement. The upper tube rear stage 4 is joined to the first connecting rod constituting the seat tube 6 by the rear connecting joint 63 in the same manner.

The first serial connection device 5 (see FIG. 13) includes a connection part 51, a fixed pipe 52, a localization device 53 and a plug 54, and the connection part 51 connects the front stage of the upper tube and the rear stage of the lower tube through the plug 54. Then, by forming two joint devices, the upper tube front stage 3 and the upper tube rear stage 4 can be rotated by 180 degrees with respect to each other, and the upper tube front stage 3 and the upper tube rear stage 4 can be rotated by the stopper 55. And can be rotated in a single direction. When the frame is opened in the straightened state, the localization device 53 fits into the concave portion in the fixed pipe 52, and by preventing the fixed pipe 52 from moving back and forth, the first series of connecting rod sets as a whole has a rigid structure. Become. When the frame is folded, the fixed pipe 52 is separated from the fixed position, and the upper tube front stage 3 and the upper tube rear stage 4 can be folded. The rear connecting joint 63 (see FIGS. 6 and 7) includes a U-shaped fitting 631, a rotary orientation device 632, and a quick lever 633. The U-shaped part of the U-shaped mounting tool 631 is welded onto the sheet tube 6, and the opening part is connected to the rotary orientation device 632 and the upper tube rear stage 4. The two fixed point positions C and D of the rotation localization device 632 are for setting the limit of the relative rotation between the upper tube rear stage 4 and the seat tube 6. The quick lever 633 provides the necessary pinching force for the localization device. The difference between the rear connecting joint 63 and the front connecting joint 13 is that their fixed positions are different from each other. The seat tube 6 is a curved hollow cylinder, one end of which is connected to the saddle 61 and the other end of which is connected to the chain wheel 62, and a rotary connector 64 for connecting the rear fork front stage 7 is welded near the saddle 61. The rotary connector 65 near the chain wheel 62 is connected to the rear fork lower tube 10. Further, to the seat tube 6, a rear connecting joint 63 for connecting the upper tube rear stage 4 is welded to an appropriate place. The second connecting rod set is a two-stage rear fork in which two rear forks separated into a front fork rear stage 7 and a rear fork rear stage 8 are connected by a second connecting device 9. The rear fork front stage 7 is a tube tube whose both ends are closed flat. One end is connected to the seat tube 6 by a rotary connector 64, and the other end is connected to the rear fork rear stage 8. The rear fork rear stage 8 is connected to the end of the rear fork lower tube by a rotary connector 81. The second connecting device 9 (see FIG. 11) includes a connecting part 91, a fixed pipe 92, a localization device 93, and a plug 94. The plug 94 connects the rear fork front stage 7 and the rear fork rear stage 8 to each other, and at the same time, The insert 94 serves as the axis of rotation, and when the frame is opened, the fixed pipe 92 connects the rear fork front section 7 and the rear fork rear section 8 with each other, so that the entire second connecting rod set has a rigid structure.

The rear fork lower tube 10 is a Y-shaped fork tube, which is connected to the rear wheel 101 by connecting the fork end to the rear wheel axle, the rotary connector 81 is connected to the rear fork rear stage 8, and is connected to the rear fork lower tube 10. One end has a hole on the chain wheel shaft, and is connected to the seat tube 6 by a rotary connector 65. When the frame is folded in the above embodiment, first, the quick levers 133 and 633 of the front connecting joint 13 and the rear connecting joint 63 are loosened, and the fixed pipe 92 of the second connecting device in the second connecting rod set is moved. As shown in FIG. 2, the second connecting rod set is bent outward. Subsequently, the upper tube 11 and the lower tube 12 are bent. At this time, since the upright tube upper stage 11 and the upright tube lower stage 12 are connected by the bending device 2, when an external force is applied to the two levers 234 and 234 of the telescopic push-in device 23 first and the levers are brought closer to each other, two rod-like members are formed. The inserts 232 and 232 approach each other while compressing the elastic body 233, and these two rod-shaped inserts 232 and 232 leave the fixing holes 211 and 221 of the first and second upper ones 21 and 22, thereby forming The first upper one 21 and the second upper one 22 are separated from each other, and the upper tube 11 and the lower tube 12 are bent while rotating. Finally, the first connecting rod set is bent by moving the fixed pipe 52 of the first serial connection device 5, and the front wheel 1211 and the rear wheel 101 are overlapped. The folded state is shown in FIG.

In order to keep the upper tube front stage 3 and the upper tube rear stage 4 in the folded first connecting rod set parallel to the plane formed by the center of the front wheel 1211 and the rear wheel 101, the rotation of the front connecting joint 13 is performed. The fixed point position B of the localization device 132 and the fixed point position C of the rotation localization device 632 of the rear connecting joint 63 are set. That is, as shown in FIGS. 4 to 7, the upper tube front stage 3 and the upper tube rear stage 4 move in the respective rotational directions by the fixed point positions A, B, C, and D in the front connecting joint 13 and the rear connecting joint 63. The upper tube front stage 3 and the upper tube rear stage 4 are restrained from rotating by the fixed point positions A and D when the frame is unfolded, but are rotated by the fixed point positions B and C when folded. Therefore, the front wheel 1211 and the rear wheel 101 are always kept parallel to the axis of the center of the wheel. The two rod-shaped inserts 232, 232 in the telescopic push-in device 23 must always be pushed in at the same time, so that the upright tube 11 and the upright tube 12 can only be bent. This means that if a user accidentally touches one of the levers 234 while riding a bicycle, the other lever 234 will act as a safety feature and the touched lever 234 will automatically return to its original position. Returning can help to ensure the safety of the cyclist. FIG. 8 shows another embodiment of the folding bicycle frame according to the present invention which is different from the above-described embodiment. The upper tube front section 3 curves downward and directly connects to the head section 14, the seat tube 6 is divided into a seat tube upper section 601 and a seat tube 602 lower section (see FIG. 12), and the seat tube upper section 601 and the seat tube lower section 602 are connected to each other. It is connected by the plug 603, and the plug 603 also serves as a shaft at the time of rotation. The seat tube upper stage 601 is connected to the rear fork front stage 7 by a rotary connector 64, and one end of the upper tube rear stage 4 is connected to the seat tube lower stage 602. The other parts are the same as those in the above-described embodiment, and will not be described.

The upper seat tube 601, the lower seat tube 602, the lower fork tube 10, the rear fork front 7 and the rear fork rear 8 form five connecting rods. At the time of folding the frame, as shown in FIG. 9, the fixed pipe 92 is moved to bend the rear fork front section 7 and the rear fork rear section 8 outward, and the seat tube upper section 601 is lowered to a predetermined position. The upper tube 11 is bent downward by the bending device 2, and finally the fixed pipe 52 is moved from the fixed position, and the first half of the frame and the second half of the frame are bent and overlapped with each other. The folded state of the frame is as shown in FIG.

[0012]

[Effect of the invention]

 As described above, the folding bicycle frame of the present invention simplifies the disassembly process of each connecting device that connects each tube, so that the frame can be folded extremely easily and each connecting device can be easily connected. By adjusting the device and rotating each connecting rod or connecting rod set, it is possible to fold the frame smaller.

[Brief description of the drawings]

FIG. 1 is a development view of an embodiment of the present invention.

FIG. 2 is an exploded view of the folding step of FIG.

FIG. 3 is a diagram showing the completed folding of FIG. 1;

4A is a side view showing the front connecting joint before folding of FIG. 1, FIG. 4B is a partial rear sectional view, and FIG. 4C is a partial side sectional view.

5 (a) is a side view showing the folded front connecting joint of FIG. 1, FIG. 5 (b) is a partial rear sectional view, and FIG. 5 (c) is a partial side sectional view thereof.

6A is a side view showing the rear connecting joint before folding in FIG. 1, FIG. 6B is a partial front sectional view thereof, and FIG. 6C is a partial sectional side view thereof.

7A is a side view showing the rear connecting joint after folding of FIG. 1, FIG. 7B is a partial front sectional view of the same, and FIG. 7C is a partial side sectional view of the same.

FIG. 8 is a development view of another embodiment of the present invention.

FIG. 9 is an exploded view of the folding step of FIG.

FIG. 10 is a diagram showing the completed folding of FIG. 8;

11 (a) is a partial side sectional view of the rear fork of FIG. 8,
(B) is the same partial front view.

12 (a) is a partial side view of the seat tube of FIG. 8, and FIG. 12 (b) is a partial front sectional view thereof.

FIG. 13 (a) is a partial plan sectional view of the upper tube of FIG. 8,
(B) is a left sectional view of the same part, and (c) is a right sectional view of the same part.

FIG. 14 is an external view of a bending device in a connected state.

FIG. 15 is an external view of a bending device in a bending state of FIG. 14;

16 is a cross-sectional view of the bending device of FIG. 14 in a connected state.

FIG. 17 is a cross-sectional view of the bending device of FIG. 14 in a state in which bending is being performed.

18 is a perspective view of a telescopic push-in device of the folding device of FIG.

[Explanation of symbols]

 2 Bending device 3 Upper tube front stage 4 Upper tube rear stage 5 First serial connection device 6 Seat tube 7 Rear fork front stage 8 Rear fork rear stage 9 Second connecting device 10 Rear fork lower tube 11 Standing tube upper stage 12 Standing tube lower stage 21 First upper one Reference Signs List 22 Second upper one 23 Telescopic push-in device 212, 222 Rotating hole 221, 211 Fixing hole 24 Insertion 231 Tubular body 232 Rod-like insertion 234 Lever 233 Elastic body 2311 Opening 2321 Cut-out 13 Front connecting joint 131 U-shaped mounting 132 Rotation positioning device 133,633 Quick lever 1321,64,65,81 Rotary connector 63 Rear connecting joint 51,91 Connecting part 52,92 Fixed pipe 53,93 Orientation device 54,94,603 Insertion 632 Rotational orientation device

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[Procedure amendment]

[Submission date] December 9, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 11

[Correction method] Change

[Correction contents]

Claims (11)

[Utility model registration claims] A vertical tube divided into a vertical tube upper stage and a vertical tube lower stage can be extended or bent by adjusting a bending device, and a first connecting rod set constituted by an upper tube front stage and an upper tube rear stage is provided. The first series connecting device connects the upper tube front stage and the lower tube rear stage, and by adjusting the first series connecting device, the first connecting rod set can be extended or bent, and the first connecting rod and sheet The tube is connected to the first connecting rod set, the first connecting rod rotates with the first connecting rod set, the second connecting rod set is connected to the first connecting rod, and the second connecting rod set is connected to the first connecting rod. Rotating with respect to each other, the second connecting rod set further comprises a second connecting device, and the second connecting rod set can be extended or bent by adjusting the second connecting device, One end is connected to the first connecting rod, the first connecting rod and the second connecting rod rotate with each other, the other end of the second connecting rod is connected to the second connecting rod set, and the second connecting rod set And the second connecting rod can rotate with respect to each other, and the above-mentioned frame structure can rotate the connecting rod and the connecting rod set by adjusting the folding device, the first serial connecting device and the second connecting device, and can be folded small. Foldable bicycle frame characterized by the following. 2. The upper tube front is connected to the standing tube by a front connecting joint, the front connecting joint having a U-shaped portion welded on the standing tube, and a rotary orientation device being provided between the opening of the U-shaped fitting and the upper tube front. The foldable bicycle frame according to claim 1, including a connected U-shaped mount and a quick lever for providing a pinching force of the rotary orientation device. 3. The foldable bicycle frame according to claim 1, wherein the standing tube and the front end of the upper tube are integrally formed. A first connecting device for connecting the upper tube front stage and the upper tube rear stage, a connecting part used for rotating the upper tube front stage and the upper tube rear stage with respect to each other; It includes a localization device used to fix the straightened and bent state of the connecting rod set, and includes a fixed pipe that wraps the upper and lower stages of the upper tube, connecting parts and insertion and the positioning device inside. The foldable bicycle frame according to claim 1, wherein 5. A first connecting rod is connected to the first connecting rod set by a rear connecting joint, the rear connecting joint comprising a U-shaped fitting having a U-shaped portion welded on the first connecting rod, and a U-shaped mounting. The foldable bicycle frame according to claim 1, wherein the opening portion of the tool includes a rotating localization device connected to the first connecting rod set, and a quick lever for applying a clamping force to the rotating localization device. 6. The folding bicycle frame according to claim 1, wherein the first connecting rod set, the first connecting rod set, and the second connecting rod set are connected by a connecting joint. 7. The first connecting rod includes an upper sheet tube connected to the second connecting rod set, and a lower sheet tube connected to the second connecting rod, wherein the lower seat tube is connected to the first connecting rod set by a rotary connector. The foldable bicycle frame according to claim 1, wherein the insertion is used to connect the upper seat tube and the lower seat tube, and the upper seat tube and the lower seat tube are rotated relative to each other. 8. A second connecting rod set is used for connecting a first fork after connecting with the first connecting rod, a fork rear connecting with the second connecting rod, a rear fork front and a rear fork rear. The foldable bicycle frame according to claim 1, further comprising a second connecting device. 9. A connecting part used by the second connecting device to connect the front stage of the rear fork and the rear stage of the rear fork, and a plug used to connect the connecting parts and rotate the front stage of the rear fork and the rear stage of the rear fork to each other. And a localization device used to fix the straightened or bent state of the second connecting rod set, and used to connect the front stage of the rear fork and the rear stage of the rear fork,
9. The foldable bicycle frame of claim 8, further comprising a connecting part and a stationary pipe in which the bayonet and orientation device is located. 10. A folding device comprising a first upper one, a second upper one, and a telescopic insertion device, wherein the upper tube is connected to the first upper one, and the lower tube is connected to the second upper one. Combined, both the first and second upper ones each have two rotation holes, two fixing holes to become the rotation axis, the fixing holes after extension are connected by insertion,
In addition, the insertion becomes an axis when rotating and bending the upper tube and the lower tube, and the fixing hole is connected by a telescopic insertion device, so that it becomes a fixing hole when the upper tube and the lower tube are aligned vertically. The foldable bicycle frame according to claim 1, characterized in that: 11. The telescopic insertion device comprises a tubular body, two rod-like insertions, two levers and an elastic body, wherein the tubular body is inside the second upper one, and the tube opening is the same as the fixing hole. Position and an opening is installed at each end of the tubular body,
The outer ends of the rod-shaped insert are formed with diagonal cuts, the elastic body is inside the tubular body, located between the two rod-shaped insertions, the two levers are respectively embedded in the two rod-shaped insertions, and the levers are respectively inserted in the openings. It can be reciprocated, the elastic body is elastic and the two rod-shaped insertions are pushed in and the upper and lower tubes are bent, and then the two rod-shaped insertions are returned to their original positions, and the outer ends of the two left and right rod-shaped insertions 2. The folding bicycle frame according to claim 1, wherein the oblique cuts are automatically slid into each other when the upper tube and the lower tube are straightened.