Bicycle frame with longitudinal sleeving and folding structure

Abstract

The bicycle comprises a front bicycle frame, a middle pipe, a rear bicycle frame, a five-way block and a rotating shaft, the front bicycle frame is arranged on the front side of the middle pipe, and the rear bicycle frame is arranged on the rear side of the middle pipe; the five-way block is arranged at the bottom of the middle pipe, a middle shaft hole is formed in the front end of the five-way block, a rotating shaft hole is formed in the rear end of the five-way block, the axis of the rotating shaft hole is perpendicular to the axis of a front frame cross beam, a rotating shaft is arranged in the rotating shaft hole, and the rotating shaft is rotationally connected with the rotating shaft hole; the axis of the rotating shaft is the rotating axis of the rear frame, the included angle between the axis of the rotating shaft and the axis of the cross beam of the front frame in the length direction is equal to 90 degrees, and after the locking device is loosened and the rear frame rotates forwards with the rotating shaft as the center, the left rear upper fork and the left rear lower fork as well as the right rear upper fork and the right rear lower fork are overlapped on the two sides of the front frame respectively. The bicycle can be folded under the condition that the bicycle frame is continuously driven, and the overall strength of the bicycle frame is not affected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of folding bicycle frame, in particular to a longitudinal sleeve folding structure bicycle frame. BACKGROUND

[0002] In a bicycle, the top of the middle tube is connected with the saddle, and the bottom is connected with the pedal shaft. The frame between the middle tube and the front wheel can be called the front frame, and the frame between the middle tube and the rear wheel can be called the rear frame. In order to facilitate carrying and placing the bicycle when not in use, a folding bicycle appears. Usually, the frame beam part can be folded, and the folded bicycle occupies less space. However, after the frame beam is disconnected to form a folding frame, the vertical bearing capacity is weakened, and the overall strength of the bicycle frame is reduced. SUMMARY

[0003] The purpose of the present application is to optimize the folding bicycle structure of the prior art, and to propose a longitudinal sleeve folding structure bicycle frame. In the case of not disconnecting the frame beam, the folding of the bicycle frame is completed after the rear wheel is removed, and the overall strength of the bicycle frame is not affected. To achieve the above purpose, the present application proposes a longitudinal sleeve folding structure bicycle frame, which comprises a front frame, a middle tube, a rear frame, a five-way block and a rotating shaft. The front frame is arranged on the front side of the middle tube, and the rear frame is arranged on the rear side of the middle tube. The five-way block is arranged at the bottom of the middle tube. The front end of the five-way block is provided with a middle shaft hole, and the rear end of the five-way block is provided with a rotating shaft hole. The axis of the rotating shaft hole is perpendicular to the axis of the front frame beam. The rotating shaft hole is provided with a rotating shaft, and the rotating shaft is connected with the rotating shaft hole in a rotating manner. The rear frame comprises a left rear upper fork, a right rear upper fork, a left rear lower fork and a right rear lower fork. The rear ends of the left rear upper fork and the left rear lower fork, and the right rear upper fork and the right rear lower fork are connected with each other through rear insertion pieces respectively. The front ends of the left rear upper fork and the right rear upper fork are connected with the middle tube through a locking device. The front ends of the left rear lower fork and the right rear lower fork are provided with shaft ears. The shaft ears are respectively attached to the rear end of the five-way block on both sides and connected with both ends of the rotating shaft. The axis of the rotating shaft is the rotation axis of the rear frame. The angle between the axis of the rotating shaft and the length direction axis of the front frame beam is equal to 90°. After the locking device is loosened, the rear frame rotates forward around the rotating shaft, and the left rear upper fork and the left rear lower fork, and the right rear upper fork and the right rear lower fork are respectively overlapped on both sides of the front frame.

[0004] As a preferred scheme of the present application, the locking device comprises a C-shaped clamp, a locking buckle, the left rear upper fork and the front end of the right rear upper fork are connected with the C-shaped clamp through the locking buckle, and the C-shaped clamp is clamped on the side of the middle tube through the locking buckle. The rear frame of this scheme rotates around the rotating shaft, the rotating shaft is located at the rear end of the five-way block, the connection position of the middle tube and the C-shaped clamp is located at the top of the rear frame, and the C-shaped clamp and the middle tube are clamped and fixed through the locking buckle. After the locking buckle is removed, the two can be separated when the rear frame rotates, although the connection strength is affected to a certain extent, the influence on the overall strength of the bicycle is small.

[0005] As a preferred scheme of the present application, the rear end of the left rear upper fork and the left rear lower fork and the rear end of the right rear upper fork and the right rear lower fork are respectively connected with the top of the rear insertion piece through the locking bolt.

[0006] As a preferred scheme of the present application, the front frame comprises an upper cross beam, a lower cross beam and a head tube, one end of the upper cross beam and the lower cross beam is connected with the side of the head tube, the other end of the upper cross beam is connected with the side of the middle tube, and the other end of the lower cross beam is connected with the top of the five-way block.

[0007] As a preferred scheme of the present application, the rotating shaft comprises a first connecting sleeve, a second connecting sleeve and a fixing bolt, the first connecting sleeve and the second connecting sleeve respectively pass through the shaft lug from both sides of the shaft lug and extend into the rotating shaft hole of the five-way block, and the fixing bolt passes through the first connecting sleeve or the second connecting sleeve and is threadedly connected with the other connecting sleeve.

[0008] As a preferred scheme of the present application, the five-way block is connected and fixed with the bottom of the front frame.

[0009] In this scheme, the middle tube and the front frame (including the upper cross beam, the lower cross beam and the head tube) are taken as a whole, the whole has no disconnection and folding structure, the rear frame is taken as the rear part of the bicycle and is rotatably connected with the aforementioned whole through the rotating shaft as the folding part, the rear wheel is removed, and the locking device is loosened, so that the rear frame can be divided into left and right parts, and the angle between the rotating axis of the rear frame, the rotating axis of the rotating shaft and the length direction axis of the upper cross beam is set, so that the left and right parts of the rear frame are located on both sides of the front frame after being rotated and folded. The middle tube and the front frame are taken as a main force bearing structure, the integrity of the structure can guarantee that the overall strength is not affected by folding, and the length of the folded bicycle frame is greatly reduced, so that the bicycle frame is convenient to carry and place.

[0010] The present application has the advantages that the folding of the bicycle is completed without disconnecting the cross beam of the frame, and the overall strength of the frame is not affected. BRIEF DESCRIPTION OF DRAWINGS Figure 1 It is a schematic diagram of the overall structure of the frame of the present application. Figure 2 It is Figure 1A schematic view of a folded rear structure of the frame. Figure 3 is Figure 1 A schematic view of an exploded structure of the frame.

[0011] Figure 4 is adopted Figure 1 A schematic view of a folded bicycle structure of the frame.

[0012] Figure 5 is Figure 1 A schematic view of a three-dimensional structure of the frame.

[0013] In the figure: 1 - front frame, 2 - middle tube, 3 - rear frame, 4 - C-shaped clamp, 5 - locking buckle, 6 - five-way block, 7 - rotating shaft, 8 - upper cross beam, 9 - lower cross beam, 10 - head tube, 13 - shaft lug, 14 - rear insertion piece, 15 - pair of locking bolts, 31 - left rear upper fork, 32 - right rear upper fork, 33 - left rear lower fork, 34 - right rear lower fork, 61 - rotating shaft hole, 62 - middle shaft hole, 71 - first connecting sleeve, 72 - second connecting sleeve, 73 - fixing bolt. DETAILED DESCRIPTION

[0014] The features and advantages of the present application will be described in detail by way of examples with reference to the accompanying drawings, in which Figures 1-5 The present application provides the following technical solutions, A longitudinal sleeve folding structure bicycle frame, comprising a front frame 1, a middle tube 2, a rear frame 3, a C-shaped clamp 4, a locking buckle 5, a five-way block 6, a rotating shaft 7; the front frame 1 comprises an upper cross beam 8, a lower cross beam 9, a head tube 10, one end of the upper cross beam 8 and the lower cross beam 9 is connected with the side surface of the head tube 10, the other end of the upper cross beam 8 is connected with the side surface of the middle tube 2, and the other end of the lower cross beam 9 is connected with the top of the five-way block 6; the rear frame 3 comprises a left rear upper fork 31, a right rear upper fork 32, a left rear lower fork 33 and a right rear lower fork 34, the front ends of the left rear upper fork 31 and the right rear upper fork 32 are connected with the C-shaped clamp 4 through the locking buckle 5, the C-shaped clamp 4 is clamped on the side surface of the middle tube 2 through the locking buckle 4, the rear ends of the left rear upper fork 31 and the left rear lower fork 33 and the right rear upper fork 32 and the right rear lower fork 34 are respectively connected with the top of a rear insert piece 14 through the locking bolt 15; the front ends of the left rear lower fork 33 and the right rear lower fork 34 are respectively provided with shaft ears 13, the shaft ears 13 are respectively close to the two sides of the rear end of the five-way block 6 and are rotatably connected with the five-way block 6 through the rotating shaft 7; the front end of the five-way block 6 is provided with a middle shaft hole 62, the rear end of the five-way block 6 is provided with a rotating shaft hole 61, and the axis of the rotating shaft 7 is perpendicular to the axis of the upper cross beam 8; the included angle between the rotating axis of the rear frame 3, the rotating axis of the rotating shaft 7 and the length direction axis of the upper cross beam 8 is equal to 90°, after the rear frame 3 is rotated, the left rear upper fork 31 and the left rear lower fork 33 and the right rear upper fork 32 and the right rear lower fork 34 are respectively overlapped on the two sides of the front frame 1; the connecting position of the rear frame 3 and the middle tube 2 is provided with the C-shaped clamp 4, the rear upper fork 11 of the rear frame 3 is connected with the C-shaped clamp 4 through the locking buckle 5; the rear frame 3 rotates around the rotating shaft 7 as the center, the rotating shaft 7 is located at the rear end of the five-way block 6, the connecting position of the middle tube 2 and the C-shaped clamp 4 is located at the top of the rear frame 3, the C-shaped clamp 4 and the middle tube 2 are clamped and released through the locking buckle 5, after the locking buckle 5 is removed, the two can be separated when the rear frame 3 is rotated.

[0015] As shown in Figure 3 the rotating shaft 7 comprises a first connecting sleeve 71, a second connecting sleeve 72 and a fixing bolt 73, the first connecting sleeve 71 and the second connecting sleeve 72 respectively pass through the shaft ears 13 from the two sides of the shaft ears 13 and extend into the five-way block 6, and the fixing bolt 73 passes through the first connecting sleeve 71 or the second connecting sleeve 72 and is threadedly connected with the other connecting sleeve. As shown in Figure 2 the five-way block 6 is connected and fixed with the middle tube 2 and the lower cross beam 9, and the five-way block 6 is rotatably connected with the rear lower fork 12 through the rotating shaft 7.

[0016] Working process of the present application: the middle tube 2, the upper cross beam 8, the lower cross beam 9 and the head tube 10 are taken as a whole, the whole has no disconnection and folding structure, the rear wheel is disassembled, the rear frame 3 is rotatably connected with the aforementioned whole as a folding part through the rotating shaft 7 as a rear part, and through the setting of the included angle between the rotating axis of the rear frame 3, the rotating axis of the rotating shaft 7 and the length direction axis of the upper cross beam 8, the rear frame 3 is located on the two sides of the front frame 1 after being rotated and folded. The above examples are illustrative of the present application and are not limiting. Other embodiments of the present application will readily occur to those skilled in the art. The application is limited only by the claims.

Claims

1. A longitudinally folding bicycle frame, characterized in that: It includes a front frame, a center tube, a rear frame, a bottom bracket, and a rotating shaft. The front frame is located on the front side of the center tube, and the rear frame is located on the rear side of the center tube. The five-way block is located at the bottom of the central tube. The front end of the five-way block is provided with a central shaft hole, and the rear end of the five-way block is provided with a rotating shaft hole. The axis of the rotating shaft hole is perpendicular to the axis of the front frame crossbeam. A rotating shaft is provided inside the rotating shaft hole, and the rotating shaft is rotatably connected to the rotating shaft hole. The rear frame includes a left rear upper fork, a right rear upper fork, a left rear lower fork, and a right rear lower fork. The rear ends of the left rear upper fork and the left rear lower fork, and the rear ends of the right rear upper fork and the right rear lower fork are connected to each other by rear inserts. The front ends of the left rear upper fork and the right rear upper fork are connected to the center tube by a locking device. The front ends of the left rear lower fork and the right rear lower fork are provided with lugs. The lugs are respectively attached to both sides of the rear end of the bottom bracket and connected to both ends of the rotating shaft. The axis of rotation is the axis of rotation of the rear frame. The angle between the axis of rotation and the axis of length of the front frame crossbeam is 90°. After the locking device is released, the rear frame rotates forward around the axis of rotation, and the left rear upper fork and the left rear lower fork, and the right rear upper fork and the right rear lower fork overlap on both sides of the front frame.

2. The longitudinally folding bicycle frame as described in claim 1, characterized in that: The locking device includes a C-shaped clamp, a locking buckle, and the front ends of the left and right rear upper forks are connected to the C-shaped clamp via the locking buckle. The C-shaped clamp is engaged with the side of the middle tube via the locking buckle.

3. A longitudinally folding bicycle frame as described in claim 1, characterized in that: The rear ends of the left upper rear fork, the left lower rear fork, the right upper rear fork, and the right lower rear fork are respectively connected to the top of the rear insert plate by locking bolts.

4. A longitudinally folding bicycle frame as described in claim 1, characterized in that: The front frame includes an upper crossbeam, a lower crossbeam, and a head tube. One end of the upper and lower crossbeams is connected to the side of the head tube, the other end of the upper crossbeam is connected to the side of the center tube, and the other end of the lower crossbeam is connected to the top of the bottom bracket.

5. A longitudinally folding bicycle frame as described in claim 1, characterized in that: The rotating shaft includes a first connecting sleeve, a second connecting sleeve, and a fixing bolt. The first connecting sleeve and the second connecting sleeve pass through the shaft lug from both sides and extend into the rotating shaft hole of the five-way block. The fixing bolt passes through the first connecting sleeve or the second connecting sleeve and is threadedly fixed to the other connecting sleeve.

6. A longitudinally folding bicycle frame as described in claim 1, characterized in that: The five-way block is connected and fixed to the bottom of the front frame.

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