Improved bicycle seat tube and frame packing structure

Abstract

The utility model relates to an improved bicycle seat tube and frame packing structure which comprises a frame and a seat tube, a packing plug cavity communicated with an inner cavity of a vertical tube is formed at the joint of an inner cavity of an upper tube of the frame and the vertical tube of the frame, and a wedge-shaped convex block and a positioning concave block matched with the wedge-shaped convex block are respectively arranged in the packing plug cavity. The face, right facing the seat tube, of the wedge-shaped protruding block serves as a packing face, the positioning concave block and the wedge-shaped protruding block are connected through a connecting screw on the upper side of the mutual contact face, and a penetrating hole channel communicated with the packing plug cavity is obliquely formed in the position, connected with the vertical tube of the bicycle frame, of the bottom face of the upper tube of the bicycle frame. A threaded hole channel coaxial with the penetrating hole channel is formed in the positioning concave block, and a Kimi screw capable of abutting against the wedge-shaped protruding block is connected into the threaded hole channel in a threaded mode. The packing structure is completely hidden in the bicycle frame upper pipe, wind resistance can be effectively reduced, meanwhile, the Kimi screw is rotated to apply force to the wedge-shaped protruding block from bottom to top, the seat pipe is locked more easily, and the stability of the seat pipe is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of bicycle assembly technology, specifically to an improved bicycle seatpost and frame clamping structure. Background Technology

[0002] Bicycles, as a mode of transportation that combines energy conservation, environmental protection, and fitness benefits, have become an indispensable part of people's daily lives. Composite material bicycles, with their advantages of light weight, high specific strength, diverse shapes, good shock absorption, chemical corrosion resistance, and weather resistance, have gradually replaced metal bicycles and are widely used in the production of various mid-to-high-end bicycles.

[0003] To minimize bicycle weight and improve riding performance, all-composite frame designs have been continuously improved, resulting in various seatpost shapes, streamlined designs, and low-drag profiles. The seatpost is a component of the frame, primarily used to support the bicycle saddle in conjunction with the seat tube. Its movement within the seat tube allows for saddle height adjustment. The traditional round seatpost shape and the method of tightly clamping the seatpost with an outer band significantly impacted the bicycle's streamlined design, directly affecting test results in wind tunnel testing and leading to increased riding resistance. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an improved bicycle seatpost and frame clamping structure, which not only enhances the stability of seatpost locking but also adopts a fully concealed structure to effectively reduce wind resistance.

[0005] This utility model is achieved through the following technical solution:

[0006] An improved bicycle seatpost and frame clamping structure is provided, including a frame and a seatpost inserted into the seat tube of the frame. The inner cavity of the top tube of the frame has a clamping plug cavity that communicates with the inner cavity of the seat tube at the connection between the top tube and the seat tube. The clamping plug cavity is provided with a wedge-shaped protrusion and a positioning recess that matches the wedge-shaped protrusion. The side of the wedge-shaped protrusion facing the seat tube serves as the clamping surface. The positioning recess and the wedge-shaped protrusion are connected by a connecting screw on the upper side of their contact surfaces. The bottom surface of the top tube of the frame has a through hole that communicates with the clamping plug cavity at an angle at the connection between the top tube and the seat tube. The positioning recess has a threaded hole that is coaxial with the through hole and passes through the positioning recess. A kimming screw that can abut against the wedge-shaped protrusion is threaded into the threaded hole.

[0007] This solution incorporates a clamping plug cavity within the top tube of the frame to accommodate wedge-shaped protrusions and positioning recesses. Combined with a kimming screw, the wedge-shaped protrusions can be controlled to apply force to the seatpost, using friction to lock the seatpost and ensuring its stability. Furthermore, the built-in locking mechanism achieves complete concealment, effectively reducing the frame's wind resistance.

[0008] Furthermore, the acute angle between the axis of the threaded channel and the horizontal plane is 30°~45°.

[0009] The axis of the threaded channel is kept at an angle of 30° to 45° with the horizontal plane, so that when the screw is tightened, the wedge-shaped protrusion applies an oblique force. Through force analysis, the force acting on the seat tube can be decomposed into two components, horizontal and upward, which enhances the locking effect on the seat tube and ensures the stability of the seat tube.

[0010] Furthermore, the axis of the connecting screw is perpendicular to the axis of the threaded hole.

[0011] Furthermore, the compression plug cavity has an opening on the top surface of the upper tube of the frame.

[0012] By opening a passage in the upper part of the compression plug cavity, it is easy to insert the wedge-shaped protrusion and positioning recess for installation, and it is also convenient for replacement and maintenance.

[0013] Preferably, the top tube of the frame is fitted with a glued cover at the opening.

[0014] By installing a glued cover plate at the opening, the compression plug cavity can be sealed, allowing the compression structure to be fully concealed and effectively reducing the wind resistance of the frame.

[0015] Furthermore, the pressing surface of the wedge-shaped protrusion is recessed to form an arc-shaped groove that matches the curvature of the seat tube.

[0016] The wedge-shaped protrusion has a recessed surface that forms an arc-shaped groove, which can match the arc surface of the seat tube to ensure that the two can fit stably, increase the contact area, and ensure stable friction.

[0017] Furthermore, the compression cavity is integrally formed with the upper tube of the frame.

[0018] The compression molding cavity is integrally formed with the upper tube of the frame, which not only ensures the overall structural strength, but also facilitates processing and forming.

[0019] Furthermore, the wedge-shaped protrusion has a recessed abutment surface that is parallel to the end face of the Jimi screw.

[0020] The surface of the wedge-shaped protrusion is recessed to form a contact surface, which is parallel to the end face of the screw. This increases the contact area between the screw and the contact surface, ensuring the stability of their interaction.

[0021] The beneficial effects of this utility model are:

[0022] This invention features a clamping cavity in the upper tube of the frame to accommodate a wedge-shaped protrusion and a positioning recess. By rotating the upward-sloping screw at the bottom, the wedge-shaped protrusion can be pushed to apply force to the seat tube. The friction between the two contact surfaces can effectively lock the seat tube. The upward-sloping locking force makes the seat tube less prone to slippage, thus ensuring its stability.

[0023] The wedge-shaped protrusion and positioning recess are built into the clamping plug cavity, and the opening is sealed with a glued cover plate, realizing the complete concealment of the clamping structure and effectively reducing the wind resistance of the frame. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure and installation of this utility model.

[0025] Figure 2 This is a partially enlarged view of the present invention.

[0026] As shown in the figure:

[0027] 1. Seat tube, 2. Upper tube, 3. Riser tube, 4. Compression plug cavity, 5. Adhesive top cover, 6. Wedge-shaped protrusion, 7. Positioning recess, 8. Connecting screw, 9. Jimi screw, 10. Through port, 11. Through hole, 12. Abutment surface. Detailed Implementation

[0028] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0029] An improved bicycle seatpost and frame clamping structure includes a frame and a seatpost 1 inserted into the seatpost 3 of the frame. The inner cavity of the top tube 2 of the frame has a clamping plug cavity 4 that communicates with the inner cavity of the seatpost 3 at the connection between the top tube 2 and the seatpost 3 of the frame. For ease of processing, the clamping plug cavity 4 is integrally formed with the top tube 2 of the frame.

[0030] The compression cavity 4 has an opening 10 on the top surface of the upper tube 2 of the frame, and the upper tube 2 of the frame is provided with a glued cover plate 5 at the opening 10.

[0031] The cavity 4 of the compression plug is provided with a wedge-shaped protrusion 6 and a positioning recess 7 that matches the wedge-shaped protrusion 6. The side of the wedge-shaped protrusion 6 facing the seat tube 1 serves as the compression surface. The compression surface of the wedge-shaped protrusion 6 is recessed to form an arc-shaped groove that matches the curvature of the seat tube 1.

[0032] The positioning recess 7 and the wedge-shaped protrusion 6 are connected on the upper side of their contact surfaces by a connecting screw 8. The bottom surface of the upper tube 2 of the frame has a through-hole 11 at its connection with the upright tube 3 of the frame, communicating with the compression plug cavity 4. The positioning recess 7 has a threaded hole coaxial with the through-hole 11 and passing through the positioning recess 7. A ferrule 9, which abuts against the wedge-shaped protrusion 6, is threaded into the threaded hole. The surface of the wedge-shaped protrusion 6 opposite the ferrule 9 has a recessed abutment surface 12 parallel to the end face of the ferrule 9. The acute angle between the axis of the threaded hole and the horizontal plane is 30°~45°. In this embodiment, the angle between the axis of the threaded hole and the horizontal plane is set to 30°. The axis of the connecting screw 8 is perpendicular to the axis of the threaded hole.

[0033] The working process of this utility model:

[0034] Connect the wedge-shaped protrusion 6 and the positioning recess 7 together using the connecting screw 8, with the connecting screw 8 in a connected but not locked state. Open the glued cover 5 at the opening 10 on the top surface of the top tube 2 of the frame and insert it into the clamping plug cavity 4, ensuring that the clamping surface of the wedge-shaped protrusion 6 faces the side of the seat tube 3. Insert the seat tube 1 into the seat tube 3, at which point the clamping surface of the wedge-shaped protrusion 6 is in contact with the seat tube 1. Insert the ferrule 9 through the through hole 11 on the bottom surface of the top tube 2 of the frame and screw it into the threaded hole using a screwdriver. The other end of the Jimi screw 9 extends out of the positioning recess 7 and abuts against the lower part of the wedge-shaped protrusion 6. By continuously rotating the Jimi screw 9, it can be pushed to apply force to the wedge-shaped protrusion 6 at an angle upward along the threaded channel. The arc-shaped groove surface of the clamping surface of the wedge-shaped protrusion 6 matches the arc surface shape of the seat tube 1 and is in close contact. When the wedge-shaped protrusion 6 is pushed, the clamping surface can be used to clamp the seat tube 1, so that the seat tube 1 is in close contact with the inner wall of the upright tube 3 of the bicycle bracket. The friction between the seat tube 1 and the inner wall of the upright tube 3 increases, thereby achieving the purpose of locking the seat tube 1.

[0035] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. An improved bicycle seat tube and frame pinch structure comprising a frame and a seat tube inserted into a stand tube of the frame, characterized in that: The upper tube inner cavity of the frame is formed with a forced plug cavity communicating with the inner cavity of the stand tube at the connection with the stand tube, the forced plug cavity is respectively provided with a wedge-shaped protrusion and a positioning recess matched with the wedge-shaped protrusion, the wedge-shaped protrusion opposite to the seat tube is used as a forced surface, the positioning recess and the wedge-shaped protrusion are connected through a connecting screw at the upper side of the mutual contact surface, the bottom surface of the upper tube of the frame is obliquely provided with a through hole communicating with the forced plug cavity at the connection with the stand tube of the frame, the positioning recess is provided with a threaded hole coaxial with the through hole and penetrating the positioning recess, and a base screw abutting against the wedge-shaped protrusion is threadedly connected in the threaded hole.

2. The improved bicycle seat tube and frame pinch structure according to claim 1, wherein: The acute angle between the axis of the threaded hole and the horizontal plane is 30°-45°.

3. The improved bicycle seat tube and frame pinch structure according to claim 2, wherein: The axis of the connecting screw is perpendicular to the axis of the threaded hole.

4. The improved bicycle seat tube and frame pinch structure of claim 1 wherein: The forced plug cavity is provided with an opening at the top surface of the upper tube of the frame.

5. The improved bicycle seat tube and frame pinch structure of claim 4, wherein: The upper tube of the frame is provided with a glued cover plate at the opening.

6. The improved bicycle seat tube and frame pinch structure of claim 1 wherein: The forced surface of the wedge-shaped protrusion is concavely formed with an arc-shaped groove surface matched with the arc of the seat tube.

7. The improved bicycle seat tube and frame pinch structure of claim 1 wherein: The forced plug cavity is integrally formed with the upper tube of the frame.

8. The improved bicycle seat tube and frame pinch structure of claim 1 wherein: The surface of the wedge-shaped protrusion opposite to the base screw is concavely formed with an abutting surface parallel to the end surface of the base screw.

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