A longitudinal sleeve-fold structure bicycle frame

Abstract

The utility model discloses a longitudinal sleeve folding structure bicycle frame. Including front frame, middle pipe, rear frame, five pass block, rotation axis, the front frame of being located middle pipe front side, the rear frame of being located middle pipe back side, the five pass block of being located middle pipe bottom, the five pass block front end setting middle axle hole, the five pass block rear end setting rotation axis hole, the rotation axis hole axis is perpendicular with front frame crossbeam axis, the rotation axis hole is equipped with rotation axis, the rotation axis is connected with rotation axis hole rotation, the rotation axis axis is the rear frame rotation axis, the rotation axis axis and front frame crossbeam length direction axis angle equal 90, the locking device loosens, the rear frame rotates forward with rotation axis as center, and the left rear upper fork and the left rear lower fork, the right rear upper fork and the right rear lower fork overlap on the two sides of the front frame respectively. The utility model discloses under the condition of not opening the frame, the folding of bicycle is completed, and there is no influence to the overall strength of the frame.

Description

Technical Field

[0001] This utility model relates to the technical field of bicycle folding frames, and in particular to a bicycle frame with a longitudinally folding structure. Background Technology

[0002] The top of the bicycle's bottom tube connects to the saddle, and the bottom connects to the pedal axle. The frame between the bottom tube and the front wheel is called the front frame, and the frame between the bottom tube and the rear wheel is called the rear frame. To facilitate carrying and storing bicycles when not in use, foldable bicycles were developed. Typically, the frame crossbeams can be folded, reducing the bicycle's space-consuming nature. However, by breaking down the frame crossbeams to create a foldable frame, its vertical load-bearing capacity is weakened, resulting in a decrease in the overall strength of the frame for riding. Utility Model Content

[0003] The purpose of this invention is to optimize the existing folding bicycle structure and propose a longitudinally folding bicycle frame that allows the bicycle frame to be folded without breaking the frame crossbeam and removing the rear wheel, without affecting the overall strength of the frame. To achieve the above objectives, this utility model proposes a longitudinally folding bicycle frame, including a front frame, a bottom bracket, a rear frame, a bottom bracket block, and a swivel axle. The front frame is located in front of the bottom bracket, and the rear frame is located behind the bottom bracket. The bottom bracket is located at the bottom of the bottom bracket, with a bottom bracket hole at its front end and a swivel axle hole at its rear end. The axis of the swivel axle hole is perpendicular to the axis of the front frame crossbeam, and a swivel axle is installed inside the swivel axle hole, rotatably connected to the swivel axle 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 left rear upper fork is connected to the left... The rear chainstay, right rear upper fork, and right rear chainstay are connected to each other via rear inserts. The front ends of the left rear upper fork and right rear upper fork are connected to the center tube via locking devices. The front ends of the left rear chainstay and right rear chainstay are provided with lugs, which 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 the rotating shaft is the axis of rotation of the rear frame. The angle between the axis of the rotating shaft and the axis of the front frame crossbeam is equal to 90°. After the locking device is released, the rear frame rotates forward around the rotating shaft, and the left rear upper fork and left rear chainstay, and the right rear upper fork and right rear chainstay overlap on both sides of the front frame.

[0004] In a preferred embodiment of this invention, the locking device includes a C-clamp, a locking buckle, and the front ends of the left and right rear upper forks are connected to the C-clamp via the locking buckle. The C-clamp is secured to the side of the center tube via the locking buckle. In this design, the rear frame rotates around a pivot point located at the rear end of the bottom bracket. The connection between the center tube and the C-clamp is located at the top of the rear frame. The C-clamp and center tube are secured by the locking buckle; removing the locking buckle allows the two to separate when the rear frame rotates. While this connection strength may be somewhat affected, the impact on the overall strength of the bicycle is minimal.

[0005] As a preferred embodiment of this utility model, 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 respectively connected to the top of the rear insert plate by locking bolts.

[0006] As a preferred embodiment of this utility model, the front frame includes an upper crossbeam, a lower crossbeam, and a head tube. One end of the upper crossbeam and the lower crossbeam are connected to the side of the head tube, the other end of the upper crossbeam is connected to the side of the middle tube, and the other end of the lower crossbeam is connected to the top of the bottom bracket.

[0007] As a preferred embodiment of the present invention, 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.

[0008] As a preferred embodiment of this utility model, the five-way block is connected and fixed to the bottom of the front frame.

[0009] In this design, the center tube and front frame (including the upper crossbeam, lower crossbeam, and head tube) are treated as a single unit without any disassembly or folding structure. The rear frame, as the rear part of the bicycle, is rotatably connected to the aforementioned unit via a rotating shaft, serving as the folding section. After removing the rear wheel and loosening the locking device, the rear frame can be divided into left and right parts. By setting the rotation axis of the rear frame and the angle between the rotation axis and the length axis of the upper crossbeam, the left and right parts of the rear frame are positioned on either side of the front frame after rotation and folding. The center tube and front frame, as a single unit, are the main load-bearing structures. Maintaining their integrity ensures that the overall strength is not affected by folding. The length of the folded bicycle frame is greatly reduced, making it easy to carry and store.

[0010] The beneficial effect of this utility model is that the bicycle can be folded without removing the frame crossbeam, and the overall strength of the frame is not affected. Attached Figure Description Figure 1 This is a schematic diagram of the overall structure of a vehicle frame according to this utility model. Figure 2 yes Figure 1 A schematic diagram of a folded frame structure. Figure 3 yes Figure 1 An exploded view of a vehicle frame structure.

[0011] Figure 4 Is adopted Figure 1 A schematic diagram of a folding bicycle frame.

[0012] Figure 5 yes Figure 1 A schematic diagram of a three-dimensional structure of a vehicle frame.

[0013] In the diagram: 1-Front frame, 2-Side tube, 3-Rear frame, 4-C-clamp, 5-Locking buckle, 6-Bottom block, 7-Swivel shaft, 8-Upper crossbeam, 9-Lower crossbeam, 10-Head tube, 13-Axle lug, 14-Rear insert, 15-Locking bolt, 31-Left rear upper fork, 32-Right rear upper fork, 33-Left rear lower fork, 34-Right rear lower fork, 61-Swivel shaft hole, 62-Side tube hole, 71-First connecting sleeve, 72-Second connecting sleeve, 73-Fixing bolt. Detailed Implementation

[0014] The features and advantages of this utility model will be described in detail through embodiments and accompanying drawings. (See attached drawings for details.) Figures 1-5 This utility model provides the following technical solution: A longitudinally folding bicycle frame includes a front frame 1, a bottom tube 2, a rear frame 3, a C-clamp 4, a locking buckle 5, a bottom bracket 6, and a swivel axle 7. The front frame 1 includes an upper crossbeam 8, a lower crossbeam 9, and a head tube 10. One end of the upper crossbeam 8 and the lower crossbeam 9 is connected to the side of the head tube 10, the other end of the upper crossbeam 8 is connected to the side of the bottom tube 2, and the other end of the lower crossbeam 9 is connected to the top of the bottom bracket 6. The rear frame 3 includes 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 to the C-clamp 4 via the locking buckle 5. The C-clamp 4 is engaged with the side of the bottom tube 2 via the locking buckle 4. The left rear upper fork 31 and the left rear lower fork 33 are connected to the C-clamp 4 via the locking buckle 5. The rear ends of the right rear upper fork 32 and the right rear lower fork 34 are respectively connected to the top of a rear insert plate 14 by locking bolts 15; the front ends of the left rear lower fork 33 and the right rear lower fork 34 are respectively provided with lugs 13, which are respectively close to the two sides of the rear end of the bottom bracket 6 and are rotatably connected to the bottom bracket 6 through a rotating shaft 7; the front end of the bottom bracket 6 is provided with a central shaft hole 62, and the rear end of the bottom bracket 6 is provided with a rotating shaft hole 61. The axis of the rotating shaft 7 is perpendicular to the axis of the upper crossbeam 8; the rotation axis of the rear frame 3, the rotation axis of the rotating shaft 7 and the length axis of the upper crossbeam 8 are at an angle of 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 overlap on both sides of the front frame 1; A C-shaped clamp 4 is provided at the connection between the rear frame 3 and the center tube 2. The rear upper fork 11 of the rear frame 3 is connected to the C-shaped clamp 4 by a locking buckle 5. The rear frame 3 rotates around the rotating shaft 7, which is located at the rear end of the bottom bracket 6. The connection between the center 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 center tube 2 are locked together by the locking buckle 5. After removing the locking buckle 5, the two can be separated when the rear frame 3 rotates.

[0015] like Figure 3 As shown, the rotating shaft 7 includes 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 pass through the shaft lug 13 from both sides and extend into the bottom bracket 6. The fixing bolt 73 passes through the first connecting sleeve 71 or the second connecting sleeve 72 and is threadedly fixed to the other connecting sleeve. like Figure 2 As shown, the five-way block 6 is connected and fixed to the middle tube 2 and the lower crossbeam 9, and the five-way block 6 is rotatably connected to the rear lower fork 12 through the rotating shaft 7.

[0016] The working process of this utility model: The middle tube 2, upper crossbeam 8, lower crossbeam 9, and head tube 10 are treated as a whole. This whole has no disassembly or folding structure. After removing the rear wheel, the rear frame 3, as the rear part of the vehicle, is rotatably connected to the aforementioned whole via the rotating shaft 7 as a folding part. By setting the rotation axis of the rear frame 3, the rotation axis of the rotating shaft 7, and the length axis of the upper crossbeam 8, the rear frame 3 is located on both sides of the front frame 1 after being rotated and folded. The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

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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