Improved folding bicycle frame

Abstract

The folding wheel is pivotally connected to the bottom tube of the bicycle and the bottom tube is pivotally connected to the bottom tube of the bicycle, and the folding wheel is pivotally connected to the bottom tube of the bicycle and the bottom tube is pivotally connected to the bottom tube of the bicycle.

Description

Technical Field

[0001] The invention relates to a bicycle frame, in particular to an improved folding bicycle frame. Background Art

[0002] At present, most bicycles are not foldable and take up a large space when parked. Foldable bicycles currently on the market generally adopt horizontal folding, and the folding joints are generally located in one or more down tubes, top tubes, seat tubes and head tubes or steering tubes of the frame. The folding mechanism can achieve a certain folding effect; however, the folding mechanism is still very large after folding, which takes up a large space and is not conducive to storage. Summary of the invention

[0003] In order to make up for the above shortcomings, the present invention designs an improved folding bicycle frame. The bicycle has a simple structure and a clever design. The frame is longitudinally folded and has a very small volume after folding, which greatly saves occupied space.

[0004] The technical solution of the present invention is achieved as follows: an improved folding bicycle frame comprises an upper tube with two ends fixed between a middle tube and a front tube, and a lower tube with one end fixed to the middle of the upper tube and the other end connected to a lower fork connector, the lower tube and the corresponding ends of the lower fork connector are rotatably fixed by a rotating shaft, the bottom end of the middle tube can be movably supported on the lower fork connector, so that the lower fork connector can rotate and fold together with the lower fork of the frame in the longitudinal direction, and when the lower fork connector rotates and folds together with the lower fork of the frame in the longitudinal direction, the lower fork connector and the corresponding wheels of the front tube can be aligned and overlapped, the upper tube part located between the middle tube and the lower tube is provided with an upper tube folding mechanism, so that the upper tube and the fixed part of the middle tube are rotated and folded, and a locking mechanism is also provided between the lower fork connector and the lower tube to prevent rotation when the frame is opened.

[0005] As a further improvement of the present invention, the upper tube folding mechanism is a side-rotating folding head, and when the upper tube portion connected to the middle tube is rotated and folded along the side, the upper tube portion can be closely attached to the lower tube.

[0006] As a further improvement of the present invention, the upper tube folding mechanism is a horizontally rotating folding head. When the upper tube portion connected to the middle tube is horizontally rotated and folded, the upper tube portion connected to the middle tube can be horizontally rotated and attached to the upper tube portion connected to the front tube of the vehicle.

[0007] As a further improvement of the present invention, the upper tube folding mechanism is a longitudinal rotating folding head. When the upper tube part connected to the middle tube is rotated and folded longitudinally, the upper tube part connected to the middle tube can be rotated longitudinally to fit tightly against the upper tube part connected to the front tube of the vehicle.

[0008] As a further improvement of the present invention, the locking mechanism is as follows: the lower fork connecting member forms a U-shaped end (and the corresponding end of the lower tube forms a lower tube forging that can extend into the U-shaped end, so that the lower tube forging is connected to the lower fork and is rotated and fixed by the rotating shaft, and the U-shaped end and the bottom end of the lower tube section are respectively provided with a clamping groove and a buckle for easy clamping and fixing.

[0009] As a further improvement of the present invention, an elastic body is fixed to the lower end of the middle tube to facilitate movable support on the corresponding recess on the lower fork connector.

[0010] The beneficial technical effect of the present invention is that the improved folding bicycle frame comprises an upper tube fixed at both ends between the middle tube and the front tube, and a lower tube fixed at one end in the middle of the upper tube and connected to the lower fork connecting piece. The lower tube and the corresponding ends of the lower fork connecting piece are rotatably fixed by a rotating shaft, and the bottom end of the middle tube can be movably supported on the lower fork connecting piece. The upper tube part located between the middle tube and the lower tube is provided with an upper tube folding mechanism, which is convenient for the upper tube and the middle tube fixed part to rotate and fold. A locking mechanism is also provided between the lower fork connecting piece and the lower tube to prevent rotation when the frame is opened. In this way, the lower fork connecting piece and the lower fork of the frame are rotated and folded in the longitudinal direction, that is, they rotate longitudinally around the middle tube, the upper tube, the lower tube and the front tube (and the front wheel) to realize the folding of the front wheel and the rear wheel. In order to further reduce the folding space, the upper tube part located between the middle tube and the lower tube is provided with an upper tube folding mechanism. In this way, the upper tube and the middle tube fixed part (including the seat cushion part) are rotated and folded, which further reduces the space and is convenient for storage.

[0011] Furthermore, the upper tube folding mechanism can be folded along the side so that the upper tube portion can be closely attached to the lower tube, and can also be folded along the longitudinal rotation (or folded along the horizontal rotation) so that the upper tube portion connected to the middle tube can be closely attached to the upper tube portion connected to the front tube of the vehicle.

[0012] Furthermore, the locking mechanism is as follows: the lower fork connecting piece forms a U-shaped end (and the corresponding end of the lower tube forms a lower tube forging that can extend into the U-shaped end, so that the lower tube forging is connected to the lower fork and is rotated and fixed by the rotating shaft, and the U-shaped end and the bottom end of the lower tube section are respectively provided with a clamping groove and a buckle that are convenient for clamping and fixing. In this way, when the folding frame is opened, the upper clamping rod of the lower tube bottom end is clamped into the upper clamping groove of the U-shaped end, and the elastic body at the bottom end of the middle tube is movably supported on the concave part of the lower fork connecting piece, and the lower tube and the lower fork connecting piece are locked to prevent rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural front view of the present invention;

[0014] Figure 2 It is a structural front view of the present invention when the locking mechanism is opened (longitudinal rotation);

[0015] Figure 3It is a structural stereogram of the present invention;

[0016] Figure 4 This is a structural front view of the first embodiment of the present invention (opening the side rotating folding head);

[0017] Figure 5 This is a structural stereogram of the second embodiment of the present invention (the horizontal rotating folding head is opened);

[0018] Figure 6 It is another structural stereogram of the second embodiment of the present invention;

[0019] Figure 7 This is a structural stereogram of Embodiment 3 of the present invention (opening the longitudinally rotating folding head);

[0020] Figure 8 It is another structural stereogram of the third embodiment of the present invention;

[0021] Fig. 9 It is a structural schematic diagram of the locking mechanism of the present invention when it is opened;

[0022] Fig.10 It is a schematic diagram of the structure of the locking mechanism of the present invention when it is buckled.

[0023] The following additional explanations are given with reference to the attached drawings:

[0024] 1——Middle tube 6——Down tube

[0025] 12——elastic body 61——lower pipe section

[0026] 2——Car head pipe 611——Snap buckle

[0027] 3 - upper tube 7 - rotating shaft

[0028] 5——Lower fork connector 91——Sideways rotating folding head

[0029] 51——Recess 92——Horizontal rotating folding head

[0030] 52——U-shaped end 93——longitudinal rotation folding head

[0031] 53——Card slot DETAILED DESCRIPTION

[0032] Combination Figures 1 to 10 , the following is a detailed statement:

[0033] An improved folding bicycle frame (such as Figure 1 and Figure 2The bicycle frame is shown in the figure, comprising an upper tube 3 with two ends fixed between a middle tube 1 and a front tube 2, and a lower tube 6 with one end fixed in the middle of the upper tube 3 and the other end connected to a lower fork connector 5, wherein the lower tube 6 and the corresponding ends of the lower fork connector 5 are rotatably fixed by a rotating shaft 7, and the bottom end of the middle tube 1 can be movably supported on the lower fork connector 5, so that the lower fork connector 5 together with the frame lower fork 10 can be rotated and folded in the longitudinal direction, and when the lower fork connector 5 together with the frame lower fork 10 can be rotated and folded in the longitudinal direction, the lower fork connector 5 and the corresponding wheels of the front tube 2 can be aligned and overlapped, and the upper tube 3 part located between the middle tube 1 and the lower tube 6 is provided with an upper tube folding mechanism, so that the upper tube 3 and the fixed part of the middle tube 1 can be rotated and folded, and a locking mechanism is also provided between the lower fork connector 5 and the lower tube 6 to prevent rotation when the frame is opened. In this way, the lower fork connector 5 together with the frame lower fork 10 (and the rear wheel) rotates and folds in the longitudinal direction, that is, rotates longitudinally around the middle tube, the upper tube, the lower tube and the front tube (and the front wheel), so that the front wheel and the rear wheel can be folded. In order to further reduce the folding space, the upper tube 3 located between the middle tube 1 and the lower tube 6 is provided with an upper tube folding mechanism, which facilitates the upper tube 3 and the fixed part of the middle tube 1 to rotate and fold, further reducing the space and facilitating storage.

[0034] In order to realize that the locking mechanism prevents rotation when the folding frame is opened, and releases rotation when the folding frame is stored (such as Fig. 9 and Fig.10 ), the locking mechanism is: the lower fork connector 5 forms a U-shaped end 52 and the corresponding end of the lower tube 6 forms a lower tube forging 61 that can be inserted into the U-shaped end 52, so that the lower tube forging 61 and the lower fork connector 5 can be rotated and fixed through the rotating shaft, and the bottom ends of the U-shaped end 52 and the lower tube section 61 are respectively provided with a clamping groove 53 and a buckle 611 for convenient clamping and fixing. The lower end of the middle tube 1 is fixed with an elastic body 12, so as to be movably supported on the corresponding recess 51 on the lower fork connector 5.

[0035] On the basis of the above, the upper tube folding mechanism has the following different folding modes:

[0036] Embodiment 1: Figure 3 and Figure 4 As shown, the upper tube folding mechanism is a side-rotating folding head 91. When the upper tube portion connected to the middle tube 1 is rotated and folded along the side, the upper tube portion can be tightly attached to the lower tube 6.

[0037] Embodiment 2: Figure 5 and Figure 6 As shown, the upper tube folding mechanism is a horizontally rotating folding head 92. When the upper tube portion connected to the middle tube 1 is horizontally rotated and folded, the upper tube portion connected to the middle tube 1 can be horizontally rotated and pressed against the upper tube portion connected to the front tube 2 of the vehicle.

[0038] Embodiment 3: Figure 7 and Figure 8 As shown, the upper tube folding mechanism is a longitudinal rotating folding head 93. When the upper tube portion connected to the middle tube 1 is rotated and folded longitudinally, the upper tube portion connected to the middle tube 1 can be rotated longitudinally to fit tightly against the upper tube portion connected to the front tube 2 of the vehicle.

[0039] By using the technology of the present invention, the folding bicycle can realize longitudinal folding through the locking mechanism, that is, the front wheel and the rear wheel can be folded through longitudinal rotation, and then three different folding modes (side rotation folding, longitudinal rotation folding, and horizontal rotation folding) can be realized through the upper tube folding mechanism, that is, the middle tube and the associated seat cushion component can be folded, thereby further reducing space, facilitating storage, and having use value.

Claims

1. An improved folding bicycle frame, comprising an upper tube (3) with two ends fixed between a middle tube (1) and a front tube (2), and a lower tube (6) with one end fixed in the middle of the upper tube (3) and the other end connected to a lower fork connecting member (5), wherein the lower tube (6) and the corresponding ends of the lower fork connecting member (5) are rotatably fixed by a rotating shaft (7), and the bottom end of the middle tube (1) can be movably supported on the lower fork connecting member (5) to facilitate the lower fork connecting member (5) to rotate and fold along the longitudinal direction together with the frame lower fork (10), and when the lower fork connecting member (5) and the frame lower fork (10) are rotated and folded along the longitudinal direction, the lower fork connecting member (5) and the corresponding wheels of the front tube (2) can be aligned and overlapped, characterized in that The upper tube (3) portion located between the middle tube (1) and the lower tube (6) is provided with an upper tube folding mechanism, which facilitates the upper tube (3) and the fixed portion of the middle tube (1) to rotate and fold, and a locking mechanism is also provided between the lower fork connecting member (5) and the lower tube (6) to prevent rotation when the frame is opened, and: The locking mechanism comprises: the lower fork connecting member (5) forms a U-shaped end (52) and the corresponding end of the lower tube (6) forms a lower tube forging (61) which can be inserted into the U-shaped end (52), so that the lower tube forging (61) and the lower fork connecting member (5) can be rotated and fixed through the rotating shaft, and the bottom ends of the U-shaped end (52) and the lower tube forging (61) are respectively provided with a clamping groove (53) and a buckle (611) for convenient clamping and fixing, and the lower end of the middle tube (1) is fixed with an elastic body (12) so as to be movably supported on the corresponding recess (51) on the lower fork connecting member (5).

2. The improved folding bicycle frame according to claim 1, characterized in that: The upper tube folding mechanism is a side-rotating folding head (91) which is connected to the middle tube (1). When the connected upper tube part is rotated and folded along the side, the upper tube part can be closely attached to the lower tube (6).

3. The improved folding bicycle frame according to claim 1, characterized in that: The upper tube folding mechanism is a horizontally rotating folding head (92). When the upper tube portion connected to the middle tube (1) is horizontally rotated and folded, the upper tube portion connected to the middle tube (1) can be horizontally rotated to be closely attached to the upper tube portion connected to the front tube (2).

4. The improved folding bicycle frame according to claim 1, characterized in that: The upper tube folding mechanism is a longitudinal rotating folding head (93). When the upper tube portion connected to the middle tube (1) is rotated and folded longitudinally, the upper tube portion connected to the middle tube (1) can be rotated longitudinally to be closely attached to the upper tube portion connected to the front tube (2).

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