Supporting structure capable of tightening chain after bicycle folding
The support structure of the tail hook, rear derailleur chain guide, and front derailleur chain guide solves the problems of loose, detached, and tangled rear chains on folding bicycles, achieving chain straightening and extending the lifespan of the bicycle.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN REDSON BICYCLE CO LTD
- Filing Date
- 2025-08-08
- Publication Date
- 2026-05-19
AI Technical Summary
Folding bicycles are prone to chain loosening, falling off, and getting tangled, affecting ease of use and the lifespan of the bicycle.
The chain is supported by a tail hook, a rear derailleur chain guide, and a front derailleur chain guide. Through the synergistic action of the tail hook, the rear derailleur chain guide, and the front derailleur chain guide, the chain is supported and kept straight, preventing loosening and tangling.
It effectively keeps the chain straight when the bicycle is folded, preventing it from loosening, falling off, or getting tangled, reducing wear and tear, extending the bicycle's lifespan, and making it easy to use.
Smart Images
Figure CN224256871U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to bicycles, specifically to a support structure that allows the bicycle chain to be tightened when folded. Background Technology
[0002] Folding bicycles are popular among consumers due to their portability and ease of storage. However, the chain on current folding bicycles is often slack after folding, making it prone to problems such as coming off or getting tangled.
[0003] This not only means that when the bicycle is used again, time needs to be spent adjusting the chain, causing inconvenience to the user, but the shaking and friction of the chain may also cause wear and tear on the chain itself and other parts of the bicycle, affecting the lifespan and performance of the bicycle.
[0004] Therefore, there is an urgent need for a support structure that can tighten the chain when the bicycle is folded to solve the above problems. Utility Model Content
[0005] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a support structure that allows the bicycle chain to be taut when folded. This structure can support and keep the chain straight after the bicycle is folded, preventing the chain from becoming loose, falling off, or tangling.
[0006] To solve the above-mentioned technical problems, this utility model provides the following solution: A support structure for a bicycle chain that can be tightened after folding, the support structure comprising:
[0007] Tail hook used to connect the chassis and the transmission;
[0008] A rear derailleur chain guide is used to support the chain when a bicycle is folded so that the chain remains straight. The first end of the rear derailleur chain guide is mounted on the bicycle rear derailleur, and the second end extends outward and is provided with a first chain guide structure at the extended end.
[0009] A front derailleur chain guide is used to support the chain when a bicycle is folded so that the chain remains straight. The first end of the front derailleur chain guide is fixed to the chainring spindle, and the second end extends out of the outer periphery of the chainring and has a second chain guide structure.
[0010] Furthermore, the tail hook has a hook opening that engages with the gear shaft of the bicycle's rear wheel, with its first end fixed to a fork leg in the rear fork and its second end locked to the rear fork pawl.
[0011] Furthermore, a vertical limiting block is provided on one side edge of the tail hook.
[0012] Furthermore, the rear derailleur chain guide includes:
[0013] Two rear support plates, the first end of each rear support plate being a fork end, which is fixed to the bicycle rear derailleur;
[0014] The connecting shaft connects the second ends of the two rear support plates;
[0015] Multiple rollers are fitted onto the connecting shaft, and the rollers are rotatable.
[0016] Furthermore, the first guide chain structure is such that a groove is formed between the roller and the second end outer rafters of the two rear support plates to limit the chain.
[0017] Furthermore, the front derailleur chain guide includes:
[0018] A front support plate, the first end of which is fixed to the toothed sprocket spindle;
[0019] The guide wheel is vertically connected to the second end of the front support plate.
[0020] Furthermore, the position of the guide wheel is adjustable.
[0021] Furthermore, the position-adjustable structure has a waist-shaped adjustment hole at the second end of the front support plate.
[0022] Furthermore, the second chain guide structure has a groove on the circumferential surface of the guide wheel to limit the chain.
[0023] Furthermore, after the rear derailleur chain guide is installed, the angle between it and the rear derailleur derailleur is 83 degrees.
[0024] Compared to existing technologies, the advantages of this invention are as follows: The support structure of this invention, which allows the bicycle chain to be taut after folding, utilizes the coordinated action of the tail hook, rear derailleur chain guide, and front derailleur chain guide to support and maintain the chain in a taut state when the bicycle is folded. This avoids problems such as chain loosening, falling off, and tangling, making it easier for users to reuse the bicycle. It also reduces wear and tear on the chain and other bicycle components, extending the bicycle's lifespan. The structural design of each component is reasonable, making installation and use convenient and highly practical. Attached Figure Description
[0025] Figure 1 This is a structural diagram of the tail hook, rear derailleur chain guide, and front derailleur chain guide of this utility model installed on the rear of a bicycle.
[0026] Figure 2 for Figure 1 Enlarged view of the rear wheel mounting structure.
[0027] Figure 3 This is an enlarged view of the mounting structure of the front derailleur chain guide of this utility model.
[0028] Figure 4 This is a structural diagram of the tail hook of this utility model.
[0029] Figure 5 This is a structural diagram of the rear derailleur chain guide of this utility model.
[0030] Figure 6 This is a structural diagram of the front derailleur chain guide of this utility model.
[0031] Figure 7 This is a structural diagram showing the installation angle of the rear derailleur chain guide of this utility model.
[0032] Figure 8 This diagram shows the taut chain of the bicycle after folding, with the rear derailleur chain guide and the front derailleur chain guide in place.
[0033] The following components are labeled in the attached diagram: chainring spindle 1, front derailleur chain guide 2, rear derailleur chain guide 3, tail hook 4, fork foot 5, gear shaft 6, rear fork hook 7, rear derailleur derailleur 8, first connecting hole 21, front support plate 22, waist-shaped adjustment hole 23, guide wheel 24, fork opening 31, rear support plate 32, roller 33, second connecting hole 41, hook opening 42, limit stop 43, threaded hole 44. Detailed Implementation
[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present utility model. Obviously, the embodiments described in this utility model are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0035] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.
[0036] Example 1: The specific structure of this utility model is as follows:
[0037] Please refer to the appendix. Figure 1-7 This utility model discloses a support structure for a bicycle chain that can be tightened after folding. The support structure includes a tail hook 4, a rear derailleur chain guide 3, and a front derailleur chain guide 2.
[0038] like Figure 4As shown, the tail hook 4 is used to connect the frame and the derailleur. The tail hook 4 has a hook opening 42, which engages with the gear shaft 6 of the bicycle's rear wheel. Its first end is a second connecting hole 41, which is fixed to one of the fork legs 5 in the rear fork by screws. The second end of the hook opening 42 has a threaded hole 44, which is locked to the rear fork pawl 7 by screws and nuts. A vertical stop 43 is provided on one side edge of the tail hook 4 to prevent it from deflecting.
[0039] like Figure 5 As shown, the rear derailleur chain guide 3 is used to support the chain after the bicycle is folded so that the chain remains straight. The first end of the rear derailleur chain guide 3 is installed on the bicycle rear derailleur 8, and its second end extends outward and is provided with a first chain guide structure at the extended end.
[0040] The rear derailleur chain guide 3 includes:
[0041] Two rear support plates 32, the first end of the two rear support plates 32 is a fork end 31, which is fixed to the bicycle rear derailleur 8;
[0042] The connecting shaft connects the second ends of the two rear support plates 32;
[0043] Multiple rollers 33 are sleeved on the connecting shaft, and the rollers 33 are rotatable.
[0044] The first guide chain structure is: a groove is formed between the roller 33 and the second end outer rafters of the two rear support plates 32 to limit the chain.
[0045] like Figure 6 As shown, the front derailleur chain guide 2 is used to support the chain after the bicycle is folded so that the chain remains straight. The first end of the front derailleur chain guide 2 is fixed to the chainring spindle 1, and the second end extends out of the outer periphery of the chainring. A second chain guide structure is provided at the second end of the front derailleur chain guide 2.
[0046] The front derailleur chain guide 2 includes:
[0047] Front support plate 22, the first end of which is fixed to the toothed disc spindle 1;
[0048] The guide wheel 24 is vertically connected to the second end of the front support plate 22.
[0049] The position of the guide wheel 24 is adjustable. This adjustable position is achieved by having a waist-shaped adjustment hole 23 at the second end of the front support plate 22. The second chain guide structure has a groove on the circumferential surface of the guide wheel 24 to limit the chain movement.
[0050] like Figure 8As shown, when the bicycle is folded, the end of the chain behind the chainring passes over the guide wheel 24 of the front derailleur chain guide 2 and reaches the rear derailleur chain guide 3. From Figure 8 As can be seen, the rear derailleur chain guide 3 increases the chain's travel distance. The chain passes through the roller 33 of the rear derailleur chain guide 3, then through the rear derailleur derailleur 8 and the shift gears, returning to the second end of the chain at the chainring, thus keeping the chain taut. This prevents the chain from becoming loose, falling off, or tangling.
[0051] like Figure 7 As shown, after the rear derailleur chain guide 3 of this utility model is installed, the angle between it and the rear derailleur is 83 degrees.
[0052] Specifically, the length of the rear derailleur chain guide 3 of this utility model is 115mm, and the distance from the center of the mounting hole of the rear derailleur chain guide 3 to the center of the screw is 95mm.
[0053] The width of the fork end 31 of the rear derailleur chain guide 3 is 17.5 mm, and the width of the other end is 22 mm.
[0054] The distance between the front and rear surfaces of the rear derailleur chain guide 3 is 19mm.
[0055] The rear derailleur chain guide 3 has a rear support plate 32 with a protrusion at the fork end 31, the protrusion being 17mm long. The distance from the protrusion to the end of the fork end 31 is 22mm.
[0056] In summary, this utility model's support structure for a taut bicycle chain after folding, through the coordinated action of the tail hook, rear derailleur chain guide, and front derailleur chain guide, can support and maintain the chain in a taut state when the bicycle is folded. This avoids problems such as chain loosening, falling off, and tangling, making it easier for users to reuse the bicycle. It also reduces wear and tear on the chain and other bicycle components, extending the bicycle's lifespan. The structural design of each component is reasonable, easy to install and use, and highly practical.
[0057] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the contents of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.
Claims
1. A support structure for a bicycle chain that can be tightened after folding, characterized in that, The support structure includes: Tail hook (4) used to connect the frame and the gearbox; A rear derailleur chain guide (3) is used to support the chain when the bicycle is folded so that the chain remains straight. The first end of the rear derailleur chain guide (3) is installed on the bicycle rear derailleur (8), and the second end extends outward and is provided with a first chain guide structure at the extended end. A front derailleur chain guide (2) is used to support the chain when a bicycle is folded so that the chain remains straight. The first end of the front derailleur chain guide (2) is fixed to the chainring spindle (1), and the second end extends out of the outer periphery of the chainring and has a second chain guide structure at the second end.
2. The support structure for a bicycle chain that can be tightened after folding, as described in claim 1, is characterized in that, The tail hook (4) has a hook opening (42) that engages with the gear shaft (6) of the bicycle rear wheel. Its first end is fixed to a fork leg (5) in the rear fork, and its second end is locked to the rear fork pawl (7).
3. The support structure for a bicycle chain that can be tightened after folding, as described in claim 2, is characterized in that, The tail hook (4) has a vertical limiting block (43) on one side edge.
4. The support structure for a bicycle chain that can be tightened after folding, as described in claim 1, is characterized in that, The rear derailleur chain guide (3) includes: Two rear support plates (32), the first end of the two rear support plates (32) is a fork end (31), which is fixed to the bicycle rear derailleur (8); The connecting shaft connects the second ends of the two rear support plates (32); Multiple rollers (33) are sleeved on the connecting shaft, and the rollers (33) are rotatable.
5. The support structure for a bicycle chain that can be tightened after folding, as described in claim 4, is characterized in that, The first guide chain structure is: a groove is formed between the roller (33) and the second end outer rafters of the two rear support plates (32) to limit the chain.
6. The support structure for a bicycle chain that can be tightened after folding, as described in claim 1, is characterized in that, The front derailleur chain guide (2) includes: A front support plate (22), the first end of which is fixed to the main shaft of the toothed disc (1); The guide wheel (24) is vertically connected to the second end of the front support plate (22).
7. A support structure for a bicycle chain that can be tightened after folding, as described in claim 6, is characterized in that, The position of the guide wheel (24) is adjustable.
8. A support structure for a bicycle chain that can be tightened after folding, as described in claim 7, is characterized in that, The position-adjustable structure has a waist-shaped adjustment hole (23) at the second end of the front support plate (22).
9. A support structure for a bicycle chain that can be tightened after folding, as described in claim 6, is characterized in that, The second chain guide structure is a groove cut into the circumferential surface of the guide wheel (24) to limit the chain.
10. A support structure for a bicycle chain that can be tightened after folding, as described in claim 1, characterized in that, After the rear derailleur chain guide (3) is installed, the angle between it and the rear derailleur is 83 degrees.