Quick mounting structure of handlebar fork

Abstract

The utility model provides a handlebar front fork quick -mounting structure, including handlebar, head tube and front fork riser, the head tube is encased in the outside of front fork riser, be equipped with the fixed sleeve pipe for encasing in the outside of front fork riser on handlebar, be equipped with the positioning convex on the inner wall of fixed sleeve pipe, the sidewall of front fork riser is equipped with the positioning groove that cooperates with positioning convex, the inside of front fork riser is equipped with sun flower nut, the top of fixed sleeve pipe is equipped with end cover, be equipped with draw bar on end cover, and the lower extreme of draw bar sun flower nut threaded connection. The utility model discloses handlebar front fork quick -mounting structure can realize handlebar and front fork riser quick dismounting, and after installation and fixation, the angle between handlebar and front fork arm is fixed immovably, guarantees use safety.

Description

Technical Field

[0001] This utility model relates to the field of bicycle technology, and more specifically, to a quick-release structure for a handlebar fork. Background Technology

[0002] The handlebars and fork of a bicycle are typically connected via a stem structure to control steering. In the most common stem structure for existing bicycles, the fork seat tube passes through the head tube of the bicycle frame, and the handlebar seat tube is inserted into the fork seat tube. The handlebar seat tube has a screw and a wedge nut that insert into the fork seat tube. By turning the screw with a wrench, the side of the wedge nut is made to lock into the wall of the fork seat tube, securing the connection through friction. With this structure, the position of the handlebars and fork needs to be visually observed during installation, as misalignment is easy to occur. Furthermore, if the friction of the wedge nut decreases or the screw becomes loose, the handlebars and fork will deviate from their normal position, making it difficult to control the direction while riding. In this case, the handlebars need to be readjusted to regain steering control, and tightening the wedge nut requires a wrench. If a wrench is not readily available, the user is forced to continue riding, which can be dangerous.

[0003] In addition, in the existing connection structure mentioned above, the position of the wedge nut needs to be fully adjusted during installation to achieve quick insertion into the fork riser. However, since the position of the wedge nut is not fixed when the screw is not tightened, interference and installation jamming will still occur during the insertion process, resulting in low installation efficiency. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to overcome at least one of the defects of the above-mentioned related technologies and provide a quick-release structure for handlebars and forks that enables quick disassembly and assembly of the handlebars and fork stems, and after installation and fixation, the angle between the handlebars and fork arms remains fixed, ensuring safety in use.

[0005] The technical solution of this utility model is to provide a quick-release structure for a bicycle handlebar and fork, including a handlebar, a head tube, and a fork stem. The head tube is fitted onto the outside of the fork stem. The handlebar is provided with a fixing sleeve for fitting onto the outside of the fork stem. The inner wall of the fixing sleeve is provided with a positioning protrusion. The side wall of the fork stem is provided with a positioning groove that mates with the positioning protrusion. A sunflower nut is fitted inside the fork stem. The top of the fixing sleeve is provided with an end cap. A pull rod is provided on the end cap, and the lower end of the pull rod is threaded to the sunflower nut.

[0006] Compared with related technologies, the quick-release structure for a bicycle handlebar fork of this utility model has the following advantages: In this utility model of a quick-release handlebar and fork structure, a fixing sleeve is provided on the handlebar, and a positioning protrusion is provided on the inner wall of the fixing sleeve. Correspondingly, a positioning groove is provided on the side wall of the fork stem. During installation, the fixing sleeve is inserted into the fork stem from top to bottom, so that the positioning protrusion matches the positioning groove, thereby limiting the circumferential position. The pull rod is used to tighten the sunflower nut and the end cap, realizing the quick installation of the handlebar and the fork stem. After installation, the two parts will not rotate relative to each other, that is, the handlebar direction will not deviate from the normal position during subsequent use, ensuring safety.

[0007] Furthermore, the side wall of the fixing sleeve is provided with an axially penetrating opening, and the fixing sleeve is provided with connecting lugs on both sides of the opening, and a locking screw is connected between the two connecting lugs.

[0008] As an improvement, the connecting lug is a bowl-shaped structure with the rim facing the opening side, and at least one of the connecting lugs has a nut pre-installed in its inner cavity.

[0009] Preferably, the positioning protrusion is a positioning pin welded and fixed to the inner wall of the fixing sleeve, and the positioning groove is a U-shaped groove for vertical engagement of the positioning pin.

[0010] Preferably, the pull rod and the end cap are an integral structure, the lower end of the pull rod has an external thread on its outer wall, and the upper end of the end cap has an operating hole.

[0011] In a further improvement, an elastic element is provided between the end cap and the sunflower nut.

[0012] Preferably, the elastic element is a spring fitted around the bolt, and the upper and lower ends of the spring abut against the end cap and the sunflower nut, respectively.

[0013] In a further improvement, the inner circumferential wall of the fork riser is provided with multiple annular grooves. When the sunflower nut is pressed axially into the inner hole of the fork riser to a set position, the two annular positioning plates of the sunflower nut engage and are positioned in the corresponding annular grooves.

[0014] Furthermore, both the upper and lower ends of the head tube are equipped with bowl assemblies, and the lower end of the fixing sleeve abuts against the bowl assembly at the upper end of the head tube.

[0015] Other improvements and advantages of this invention will be set forth in the detailed description that follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained through the structures particularly pointed out in the description and drawings. Attached Figure Description

[0016] Figure 1This is a perspective view of the quick-release structure of the handlebar fork of this utility model. Figure 2 This is an exploded view of the quick-release structure of the handlebar fork of this utility model; Figure 3 This is a partial sectional view of the quick-release structure of the handlebar fork of this utility model.

[0017] Explanation of reference numerals in the attached figures: 1. Handlebar; 2. Head tube; 3. Fork stem; 4. Mounting sleeve; 5. Positioning protrusion; 6. Positioning groove; 7. Sunflower nut; 701. Annular positioning plate; 8. End cap; 9. Tie rod; 10. Opening; 11. Connecting lug; 12. Locking screw; 13. Nut; 14. Operating hole; 15. Elastic element; 16. Annular groove; 17. Cup assembly; Detailed Implementation

[0018] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0019] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0020] In this embodiment of the utility model, unless otherwise explicitly specified and limited, the first feature at the "upper end" or "lower end" of the second feature may be in direct contact with the first feature, or indirect contact with the first feature through an intermediate medium. Moreover, the first feature at the "lower end" or "lower side" of the second feature may be directly below or diagonally below the second feature, or simply indicate that the horizontal height of the first feature is less than that of the second feature.

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] See Figures 1-3As shown in the figure, this utility model embodiment discloses a quick-release structure for a bicycle handlebar and fork, including a handlebar 1, a head tube 2, and a fork stem 3. The lower end of the fork stem 3 is connected to the forks (not shown in the figure) on both sides of the front wheel. The head tube 2 is fitted onto the outside of the fork stem 3, and the lower end of the head tube 2 abuts against and limits the fork. In this structure, cup assemblies 17 are installed at both the upper and lower ends of the head tube 2. In addition, a fixing sleeve 4 is provided on the handlebar 1 for fitting onto the outside of the fork stem 3. Here, the fixing sleeve 4 and the handlebar 1 are an integral structure, specifically fixed by welding. The inner wall of the fixed sleeve 4 is provided with a positioning protrusion 5, and the side wall of the fork stem 3 is provided with a positioning groove 6 that matches the positioning protrusion 5. During installation, the fixed sleeve 4 is inserted into the fork stem 3 from top to bottom, and the positioning protrusion 5 is matched with the positioning groove 6 to achieve circumferential position limitation. The inside of the fork stem 3 is fitted with a sunflower nut 7. The top of the fixed sleeve 4 is provided with an end cap 8, and the end cap 8 is provided with a pull rod 9, and the lower end of the pull rod 9 is threaded with the sunflower nut 7. By tightening the pull rod 9, the end cap 8, the fixed sleeve 4 and the fork stem 3 are driven to be axially pulled and fixed, so as to achieve quick installation of the handlebar 1 and the fork stem 3. After installation, the lower end of the fixed sleeve 4 abuts against the cup assembly 17 at the upper end of the head tube 2. And after installation, the two parts will not rotate relative to each other, that is, the handlebar 1 will not deflect during subsequent use, ensuring safety.

[0023] More specifically, an axially penetrating opening 10 is provided on the side wall of the fixed sleeve 4, and connecting lugs 11 are provided on both sides of the opening 10 on the fixed sleeve 4. A locking screw 12 is connected between the two connecting lugs 11. The width of the opening 10 can be adjusted by adjusting the locking screw 12, thereby achieving the clamping and loosening of the fixed sleeve 4 and the front fork stem 3. In this structure, preferably, a vertically extending anti-slip groove is provided on the inner peripheral wall of the fixed sleeve 4, which can effectively increase the clamping friction when clamping the outside of the front fork stem 3.

[0024] In this embodiment, preferably, the two connecting lugs 11 have the same structure, both being bowl-shaped structures with the rim facing the opening 10, and at least one connecting lug 11 has a nut 13 pre-installed in its inner cavity. In this structure, the two connecting lugs 11 and the fixing sleeve 4 are integrally formed, and the nut 13 is connected and fixed to the corresponding connecting lug 11 by a riveting process.

[0025] In this embodiment, as a preferred structure, the positioning protrusion 5 is a positioning pin that is welded and fixed to the inner wall of the fixing sleeve 4 in the radial direction, and the positioning groove 6 is a U-shaped groove for vertical engagement of the positioning pin. That is, the positioning groove 6 is an opening 10 that extends downward along the upper end face of the front fork riser 3. This structure is convenient for processing and reduces costs.

[0026] In addition, in this embodiment, the pull rod 9 and the end cap 8 are an integral structure, that is, the lower end of the pull rod 9 has an external thread on its outer wall, and the upper end of the end cap 8 has an operating hole 14. The operating hole 14 here is preferably a countersunk hexagonal socket, which can be easily installed by rotating the end cap 8 with a special operating tool (hexagonal wrench).

[0027] Furthermore, in this embodiment, to further enhance the locking force between the pull rod 9 and the sunflower nut 7, an elastic element 15 is provided between the end cap 8 and the sunflower nut 7. The elastic element 15 can enhance the preload of the threaded connection structure between the pull rod 9 and the sunflower nut 7, thereby preventing reverse loosening. Preferably, the elastic element 15 is a spring fitted outside the pull rod 9, and the upper and lower ends of the spring abut against the end cap 8 and the sunflower nut 7, respectively.

[0028] In addition, in this embodiment, multiple annular grooves 16 are provided on the inner peripheral wall of the front fork riser tube 3. When the sunflower nut 7 is pressed into the inner hole of the front fork riser tube 3 along the axial direction to the set position, the two annular positioning plates 701 of the sunflower nut 7 are engaged and positioned in the corresponding annular grooves 16, ensuring that the sunflower nut 7 will not move axially under the axial pulling action of the pull rod 9, thus ensuring the stability of the connection structure.

[0029] In the description of the embodiments of this utility model, it should be noted that the terms "both sides", "up and down", etc., indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0030] In the description of this utility model, the reference to terms such as "this embodiment," "some embodiments," etc., indicates that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0031] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A quick-release structure for a bicycle handlebar and fork, comprising a handlebar (1), a head tube (2), and a fork stem (3), wherein the head tube (2) is fitted onto the outside of the fork stem (3), characterized in that: The handlebar (1) is provided with a fixing sleeve (4) for fitting onto the outside of the front fork stem (3). The inner wall of the fixing sleeve (4) is provided with a positioning protrusion (5). The side wall of the front fork stem (3) is provided with a positioning groove (6) that cooperates with the positioning protrusion (5). The interior of the front fork stem (3) is fitted with a sunflower nut (7). The top of the fixing sleeve (4) is provided with an end cap (8). The end cap (8) is provided with a pull rod (9), and the lower end of the pull rod (9) is threaded to the sunflower nut (7).

2. The quick-release structure for the handlebar fork according to claim 1, characterized in that: The fixed sleeve (4) has an axially penetrating opening (10) on its side wall, and the fixed sleeve (4) has connecting lugs (11) on both sides of the opening (10), and a locking screw (12) is connected between the two connecting lugs (11).

3. The quick-release structure for the handlebar fork according to claim 2, characterized in that: The connecting lug (11) is a bowl-shaped structure with the rim facing the opening (10), and at least one of the connecting lugs (11) has a nut (13) pre-installed in its inner cavity.

4. The quick-release structure for the handlebar fork according to claim 1, characterized in that: The positioning protrusion (5) is a positioning pin welded and fixed to the inner wall of the fixed sleeve (4), and the positioning groove (6) is a U-shaped groove for vertical engagement of the positioning pin.

5. The quick-release structure for the handlebar fork according to claim 1, characterized in that: The pull rod (9) and the end cap (8) are an integral structure. The lower end of the pull rod (9) is provided with external threads on its outer wall, and the upper end of the end cap (8) is provided with an operating hole (14).

6. The quick-release handlebar fork structure according to any one of claims 1 to 5, characterized in that: An elastic element (15) is provided between the end cap (8) and the sunflower nut (7).

7. The quick-release structure for the handlebar fork according to claim 6, characterized in that: The elastic element (15) is a spring fitted outside the pull rod (9), and the upper and lower ends of the spring abut against the end cap (8) and the sunflower nut (7) respectively.

8. The quick-release structure for the handlebar fork according to claim 1, characterized in that: The inner circumferential wall of the fork riser (3) is provided with multiple annular grooves (16). When the sunflower nut (7) is pressed into the inner hole of the fork riser (3) along the axial direction to the set position, the two annular positioning plates (701) of the sunflower nut (7) are engaged and positioned in the corresponding annular grooves (16).

9. The quick-release structure for the handlebar fork according to claim 1, characterized in that: Both ends of the head tube (2) are equipped with bowl components (17), and the lower end of the fixed sleeve (4) abuts against the bowl component (17) at the upper end of the head tube (2).

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