Folding bicycle frame

Abstract

The utility model relates to the technical field of bicycle frames, in particular to a folding bicycle frame which comprises a cross beam support, a front wheel support and a rear wheel support, the front wheel support and the rear wheel support are fixed at the front end and the rear end of the cross beam support respectively, and the cross beam support is composed of a fixed support and a movable support. The ends, close to each other, of the fixed support and the movable support are hinged, positioning discs are fixed to the upper side and the lower side of the end, close to the movable support, of the fixed support, positioning holes are evenly formed in the positioning discs, and positioning blocks are movably installed at the positions, corresponding to the positioning holes, of the upper end and the lower end of the movable support. When the fixed support and the movable support are folded, the positioning blocks are inserted into the positioning holes, so that the folding device not only can be folded, but also can be bent at a specified angle, and can be suitable for different storage spaces; and the self-weighing frame is more flexible and convenient to store.

Description

Technical Field

[0001] The utility model relates to the technical field of bicycle frames, in particular to a foldable bicycle frame. Background Art

[0002] The bicycle frame is the main structural component of a bicycle. It supports and connects various parts of the bicycle, including the front wheel, rear wheel, gear system, etc.

[0003] A foldable bicycle frame refers to a frame whose main structure can be folded, so that the bicycle can be stored conveniently. However, a common bicycle folding can only be folded 180 degrees to reduce its overall volume and length, but cannot be bent at other angles. In actual storage, such as a right-angle storage space, the folded bicycle frame exceeds the thickness standard and cannot be placed. At this time, the frame needs to be bent at a right angle. Therefore, it is necessary to design a foldable bicycle frame that can be fixed at multiple bending angles. Utility Model Content

[0004] The utility model aims to solve the problems existing in the background technology and to provide a foldable bicycle frame which can be fixed at various bending angles.

[0005] The technical solution of the utility model is as follows: a foldable bicycle frame comprises a crossbeam bracket, a front wheel bracket and a rear wheel bracket, the front wheel bracket and the rear wheel bracket are respectively fixed at the front and rear ends of the crossbeam bracket, the crossbeam bracket is composed of a fixed bracket and a movable bracket, the fixed bracket and the movable bracket are hinged at one end close to each other, positioning plates are fixed on the upper and lower sides of the fixed bracket close to one end of the movable bracket, positioning holes are evenly opened on the positioning plates, positioning blocks are movably installed at the upper and lower ends of the movable bracket and at positions corresponding to the positioning holes, and a driving component for driving the positioning blocks to extend and retract is arranged in the movable bracket.

[0006] Preferably, the driving assembly includes a telescopic slot, which is opened in the movable bracket and aligned with the positioning block. A pair of bearing frames are fixed in the telescopic slot, and a bidirectional screw rod is rotatably connected between the bearing frames. Both ends of the bidirectional screw rod pass through the bearing frames and are threadedly connected with the telescopic block, and the telescopic block is fixed to the positioning block at one end away from the positioning block.

[0007] Preferably, a driven bevel gear is fixed in the middle position of the bidirectional screw rod, the front side wall of the telescopic slot is rotatably connected to a driving bevel gear meshing with the driven bevel gear, and a rotating plate is rotatably connected to the front side of the movable bracket and at a position corresponding to the driving bevel gear, and the rotating plate and the driving bevel gear are fixed by a connecting shaft.

[0008] Preferably, the movable bracket is provided with a fixing groove at a middle position near one end of the fixed bracket, and a fixing block is installed at the end of the fixed bracket and at a position corresponding to the fixing groove, and the fixing block is inserted into the fixing groove.

[0009] Preferably, an installation groove is opened in the fixed bracket and at a position corresponding to the fixed block, a fixing spring is fixed between one end of the fixed block located in the installation groove and the inner side wall of the installation groove, an operating rod is fixed at one end of the fixed block located in the installation groove, and the front end of the operating rod passes through the installation groove and is slidably connected to the side wall of the installation groove.

[0010] Preferably, the positioning plate is a circular structure, and the center position of the circle is aligned with the hinge positions of the fixed bracket and the movable bracket.

[0011] Compared with the prior art, the utility model has the following beneficial technical effects: when folding the fixed bracket and the movable bracket, the positioning block is inserted into the positioning hole, which not only allows them to be folded but also allows them to be bent at a specified angle, and can be suitable for different storage spaces, making the self-propelled frame more flexible and convenient to store. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the front cutaway structure of the utility model;

[0013] Figure 2 For this utility model Figure 1 The enlarged structural diagram at A in the middle;

[0014] Figure 3 This is a schematic diagram of the top view of the connection between the fixed bracket and the movable bracket of the utility model;

[0015] Figure 4 This is a schematic diagram of the driving structure of the positioning block of the utility model.

[0016] Figure numerals: 1, crossbeam bracket; 11, fixed bracket; 12, movable bracket; 2, front wheel bracket; 3, rear wheel bracket; 4, positioning plate; 41, positioning hole; 5, telescopic slot; 51, bearing frame; 52, two-way screw rod; 53, telescopic block; 54, positioning block; 55, driven bevel gear; 56, driving bevel gear; 57, rotating plate; 6, fixed block; 61, mounting slot; 62, fixing spring; 7, fixing slot. DETAILED DESCRIPTION

[0017] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] Example

[0019] like Figure 1-4As shown, a foldable bicycle frame proposed by the utility model comprises a crossbeam support 1, a front wheel support 2 and a rear wheel support 3, the front wheel support 2 and the rear wheel support 3 are respectively fixed at the front and rear ends of the crossbeam support 1, the crossbeam support 1 is composed of a fixed support 11 and a movable support 12, the fixed support 11 and the movable support 12 are hinged at one end close to each other, positioning plates 4 are fixed at the upper and lower sides of the fixed support 11 close to the movable support 12, positioning holes 41 are evenly opened on the positioning plates 4, positioning blocks 54 are movably installed at the upper and lower ends of the movable support 12 and at positions corresponding to the positioning holes 41, a driving component for driving the positioning block 54 to extend and retract is arranged in the movable support 12, the positioning plate 4 is a circular structure, and the center position of the circle is aligned with the hinge position of the fixed support 11 and the movable support 12.

[0020] The driving assembly includes a telescopic slot 5, which is opened in the movable bracket 12 and aligned with the positioning block 54. A pair of bearing frames 51 are fixed in the telescopic slot 5, and a bidirectional screw rod 52 is rotatably connected between the bearing frames 51. Both ends of the bidirectional screw rod 52 pass through the bearing frames 51 and are threadedly connected with a telescopic block 53. The telescopic block 53 is fixed to the positioning block 54 at one end away from the telescopic block 53. A driven bevel gear 55 is fixed in the middle position of the bidirectional screw rod 52. A driving bevel gear 56 meshing with the driven bevel gear 55 is rotatably connected to the front side wall of the telescopic slot 5. A rotating plate 57 is rotatably connected to the front side of the movable bracket 12 and at a position corresponding to the driving bevel gear 56. The rotating plate 57 and the driving bevel gear 56 are fixed by a connecting shaft.

[0021] A fixing groove 7 is provided at the middle position of one end of the movable bracket 12 near the fixed bracket 11, a fixing block 6 is installed at the end of the fixed bracket 11 and at a position corresponding to the fixing groove 7, the fixing block 6 is inserted into the fixing groove 7, a mounting groove 61 is provided in the fixed bracket 11 and at a position corresponding to the fixing block 6, a fixing spring 62 is fixed between one end of the fixing block 6 located in the mounting groove 61 and the inner side wall of the mounting groove 61, an operating rod is fixed at one end of the fixing block 6 located in the mounting groove 61, and the front end of the operating rod passes through the mounting groove 61 and is slidably connected to the side wall of the mounting groove 61.

[0022] The movable bracket 12 is folded and folded when the end of the telescopic block 53 is pulled out of the fixed slot 7. In this process, the rotating plate 57 on the movable bracket 12 is rotated to drive the driving bevel gear 56 to rotate, and then the driven bevel gear 55 is driven to drive the bidirectional screw rod 52 to rotate, and finally the telescopic block 53 is driven to slide. When the telescopic block 53 slides outward, the positioning block 54 can slide outward until it extends out of the telescopic slot 5 and is inserted into the designated positioning hole 41, so that the movable bracket 12 is fixed to the positioning plate 4. The positioning block 54 is inserted into different positioning holes 41, so that the fixed bracket 11 and the movable bracket 12 can be fixed at different angles. When the movable bracket 12 is stored, it can be folded in half or bent and fixed at a designated angle according to the actual storage space, so that it can be placed in different storage spaces, and the storage operation is more convenient.

[0023] The above-mentioned specific embodiments are only several preferred embodiments of the present invention. Based on the technical solution of the present invention and the relevant inspiration of the above-mentioned embodiments, those skilled in the art can make various alternative improvements and combinations to the above-mentioned specific embodiments.

Claims

1. A foldable bicycle frame, comprising a crossbeam support (1), a front wheel support (2) and a rear wheel support (3), characterized in that: The front wheel bracket (2) and the rear wheel bracket (3) are respectively fixed to the front and rear ends of the cross beam bracket (1); the cross beam bracket (1) is composed of a fixed bracket (11) and a movable bracket (12); the fixed bracket (11) and the movable bracket (12) are hinged at one end close to each other; positioning plates (4) are fixed at the upper and lower sides of the end of the fixed bracket (11) close to the movable bracket (12); positioning holes (41) are evenly provided on the positioning plate (4); positioning blocks (54) are movably installed at the upper and lower ends of the movable bracket (12) and at positions corresponding to the positioning holes (41); a driving component for driving the positioning blocks (54) to extend and retract is provided in the movable bracket (12).

2. A foldable bicycle frame according to claim 1, characterized in that: The driving assembly comprises a telescopic slot (5), the telescopic slot (5) being arranged in the movable bracket (12) and aligned with the positioning block (54), a pair of bearing frames (51) being fixed in the telescopic slot (5), a bidirectional screw rod (52) being rotatably connected between the bearing frames (51), two ends of the bidirectional screw rod (52) passing through the bearing frames (51) and being threadedly connected with a telescopic block (53), and one end of the telescopic block (53) being away from the positioning block (54) being fixed.

3. A foldable bicycle frame according to claim 2, characterized in that: A driven bevel gear (55) is fixed in the middle of the bidirectional screw rod (52); a driving bevel gear (56) meshing with the driven bevel gear (55) is rotatably connected to the front side wall of the telescopic slot (5); a rotating plate (57) is rotatably connected to the front side of the movable bracket (12) at a position corresponding to the driving bevel gear (56); the rotating plate (57) and the driving bevel gear (56) are fixed via a connecting shaft.

4. A foldable bicycle frame according to claim 1, characterized in that: The movable bracket (12) is provided with a fixing groove (7) at a middle position near one end of the fixing bracket (11), and a fixing block (6) is installed at the end of the fixing bracket (11) and at a position corresponding to the fixing groove (7), and the fixing block (6) is inserted into the fixing groove (7).

5. A foldable bicycle frame according to claim 4, characterized in that: A mounting groove (61) is provided in the fixing bracket (11) at a position corresponding to the fixing block (6); a fixing spring (62) is fixed between one end of the fixing block (6) located in the mounting groove (61) and an inner side wall of the mounting groove (61); an operating rod is fixed at one end of the fixing block (6) located in the mounting groove (61); and a front end of the operating rod passes through the mounting groove (61) and is slidably connected to the side wall of the mounting groove (61).

6. A foldable bicycle frame according to claim 1, characterized in that: The positioning plate (4) is a circular structure, and the center position of the circle is aligned with the hinge positions of the fixed bracket (11) and the movable bracket (12).

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