Seat tube locking structure for bicycle

Abstract

The utility model relates to a seat tube locking structure for a bicycle. Comprising a base, the front portion of the base is provided with a longitudinally-through base pipe hole, the rear portion of the base is provided with a first fork arm and a second fork arm which are opposite to each other, an in-seat groove is formed in the base and behind the base pipe hole, a locking block is arranged in the in-seat groove, the front portion of the locking block is provided with an arc-shaped vertical face matched with a seat pipe, and the rear portion of the locking block is provided with a block rear inclined face. The rear part of the in-seat groove is provided with an in-groove inclined surface matched with the block rear inclined surface, the middle part of the locking block is provided with an on-block groove, the groove bottom of the on-block groove is provided with a vertical through strip-shaped hole, the groove bottom of the in-seat groove is provided with a groove bottom threaded hole, the locking screw penetrates through the strip-shaped hole, and the lower end of the locking screw is positioned in the groove bottom threaded hole. The utility model provides a seat tube locking structure for a bicycle, which avoids the problems of loss and the like caused by random disassembly, is not easy to loosen, can stably set a saddle at a specific height, and is neat in appearance.

Description

Technical Field

[0001] The utility model belongs to the technical field of bicycle structures, and in particular relates to a seat tube locking structure for a bicycle. Background Art

[0002] Bicycles are one of the common means of transportation for people. In terms of structure, bicycles are composed of a frame, a seat assembly, a handlebar assembly, and front and rear wheels. Since different riders have different heights and riding sitting habits, the height of the seat assembly is usually adjustable. The existing adjustment structure is: the seat is installed on the top of the seat tube, and a locking piece is set at the pipe opening of the frame tube. After the seat tube is inserted into the frame tube and the seat is adjusted to a suitable height, the locking piece is operated to close the seat tube and the frame tube to fix and combine them into a whole.

[0003] The above structure has the following defects: first, the existing locking member is installed in an exposed manner, and anyone can operate it at will, which leads to problems such as the loss of the seat assembly; second, the existing locking method is prone to loosening, resulting in the seat assembly being unable to maintain a set height. In summary, it is necessary to optimize the locking structure of the seat tube to solve the above technical problems. Utility Model Content

[0004] The utility model aims to provide a seat tube locking structure for a bicycle, which can avoid problems such as loss caused by random disassembly, is not easy to loosen, and has a neat appearance.

[0005] The technical solution adopted by the utility model is: a seat tube locking structure for a bicycle, comprising a base with a longitudinally penetrating base tube hole at the front, a first fork arm and a second fork arm opposite to each other are arranged at the rear of the base, a seat inner groove is arranged inside the base and behind the base tube hole, a locking block is arranged in the seat inner groove, the front of the locking block has an arc-shaped vertical surface matched with the seat tube, the rear of the locking block has a block rear inclined surface, the rear of the seat inner groove is provided with an inner groove inclined surface matched with the block rear inclined surface, a block upper groove is arranged in the middle of the locking block, a vertically penetrating strip hole is arranged at the bottom of the block upper groove, a groove bottom threaded hole is arranged at the bottom of the groove of the seat inner groove, and also includes a locking screw, the locking screw passes through the strip hole and the lower end is located in the groove bottom threaded hole.

[0006] Preferably, a decorative gland with a gland pipe hole at the front is provided above the base, and the decorative gland is fixedly connected to the base by screws.

[0007] Preferably, a screw hole is provided on the top of the base and the screw hole is a stepped hole, a positioning boss is provided at a corresponding position on the rear bottom of the decorative pressure cover, an assembly hole is provided at the center position of the positioning boss, and anti-disassembly screws are provided in the assembly hole and the screw hole to fix the decorative pressure cover to the base.

[0008] Preferably, the base, the first fork arm and the second fork arm are integrally formed structures, and a base connecting portion protruding downward is provided at the bottom of the base, and the base connecting portion is embedded in the upper end of the frame tube and welded.

[0009] Preferably, a first fork arm connecting portion having a side wall with a first positioning block is provided at the rear end of the first fork arm, and a second fork arm connecting portion having a side wall with a second positioning block is provided at the rear end of the second fork arm. The first fork arm connecting portion and the second fork arm connecting portion are respectively inserted into the upper ends of the first vertical fork and the second vertical fork and are welded together.

[0010] The advantages and positive effects of the utility model are:

[0011] The utility model provides a seat tube locking structure for a bicycle. Compared with the existing seat tube locking structure, the utility model adopts a locking block located in a groove in the seat for locking. When operating the locking screw, the rear inclined surface of the locking block cooperates with the inner inclined surface of the groove in the seat. Therefore, under the downward pressure provided by the locking screw, the locking block moves forward to squeeze and fix the seat tube. Compared with the existing locking method using a locking piece installed on the frame tube, the seat tube locking structure in the utility model has no exposed parts that can be operated at will, so it can avoid problems such as loss due to random disassembly. On the other hand, compared with the existing locking and fixing method, the seat tube locking structure is not prone to loosening, and the seat can be set at a specific height.

[0012] The seat tube locking structure of the present invention is a separate component and can be installed on the frame in an integrated manner. Compared with the existing structure using exposed locking parts, the seat tube locking structure of the present invention has a neat appearance and no protruding parts, thereby improving the overall aesthetic effect while avoiding problems such as hooking the rider's clothes. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the external structure of the utility model;

[0014] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0015] Figure 3 It is a schematic diagram of the internal structure of the utility model;

[0016] Figure 4 yes Figure 1 Schematic diagram of the structure of the middle decorative gland, bottom view;

[0017] Figure 5 yes Figure 2 Schematic diagram of the structure of the middle locking block, from the upper perspective;

[0018] Figure 6It is a schematic diagram of the application state structure of the utility model.

[0019] In the figure:

[0020] 1. Base; 2. Base connection part; 3. Gland tube hole; 4. Decorative gland; 5. Assembly hole; 6. First positioning block; 7. First fork arm; 8. First fork arm connection part; 9. Second positioning block; 10. Second fork arm; 11. Second fork arm connection part; 12. Base tube hole; 13. Locking block; 13-1. Arc vertical surface; 13-2. Groove on block; 13-3. Strip hole; 13-4. Rear inclined surface of block; 14. Screw hole; 15. Groove in seat; 16. Inclined surface in groove; 17. Threaded hole at bottom of groove; 18. Positioning boss; 19. First vertical fork; 20. Second vertical fork; 21. Frame tube. DETAILED DESCRIPTION

[0021] In order to further understand the content, features and effects of the present invention, the following embodiments are given to explain in detail.

[0022] See also Figure 1 and Figure 6 The seat tube locking structure for a bicycle of the present invention comprises a base 1 with a longitudinally penetrating base tube hole 12 at the front, and a first fork arm 7 and a second fork arm 10 are provided at the rear of the base 1. The seat tube locking structure of the present invention is installed on the frame of the bicycle as an independent component, wherein the base 1 is fixedly mounted on the top of the frame tube 21 of the bicycle, and the first fork arm 7 and the second fork arm 10 are used for fixed connection with the rear fork of the bicycle, that is, the first fork arm 7 is connected with the first fork 19, and the second fork arm 10 is connected with the second fork 20.

[0023] In this embodiment, the base 1, the first fork arm 7 and the second fork arm 10 are an integrally formed structure, and can be formed by integrally milling an aluminum alloy block through a machining center to ensure integrity and improve overall structural strength.

[0024] In this embodiment, a base connection part 2 protruding downward is provided at the bottom of the base 1, and the base connection part 2 is embedded in the upper end of the frame tube 21 and welded, a first fork arm connection part 8 with a first positioning block 6 on the side wall is provided at the rear end of the first fork arm 7, and a second fork arm connection part 11 with a second positioning block 9 on the side wall is provided at the rear end of the second fork arm 10, and the first fork arm connection part 8 and the second fork arm connection part 11 are respectively inserted into the upper ends of the first fork 19 and the second fork 20 and welded. The purpose of providing the first positioning block 6 and the second positioning block 9 is to improve the position accuracy of the butt connection between the first fork arm 7 and the first fork 19, and between the second fork arm 10 and the second fork 20.

[0025] See also Figure 2 , Figure 3 and Figure 5 , we can see that:

[0026] An inner seat groove 15 is provided inside the base 1 and behind the base tube hole 12, and a locking block 13 is provided in the inner seat groove 15. The front part of the locking block 13 has an arc-shaped vertical surface 13-1 that cooperates with the seat tube, and the rear part of the locking block 13 has a block rear inclined surface 13-4. The rear part of the inner seat groove 15 is provided with an inner groove inclined surface 16 that cooperates with the block rear inclined surface 13-4.

[0027] Since the locking block 13 is connected in the inner groove 15 of the seat through the rear inclined surface 13-4 of the block and the inclined surface 16 in the groove, when pressure is applied downward to the locking block 13, due to the cooperation between the inclined surfaces, the locking block 13 moves forward, exerts a squeezing and fixing effect on the seat tube in the base tube hole 12, thereby locking the seat tube.

[0028] A block groove 13-2 is provided in the middle of the locking block 13, a vertically penetrating strip hole 13-3 is provided at the bottom of the block groove 13-2, a groove bottom threaded hole 17 is provided at the bottom of the seat inner groove 15, and a locking screw is also provided, the locking screw passes through the strip hole 13-3 and the lower end is located in the groove bottom threaded hole 17, and the nail head part of the locking screw is located in the block groove 13-2 accordingly. The locking screw can provide downward pressure for the locking block 13, and the strip hole 13-3 can ensure that the locking block 13 can move forward and backward, and the width of the locking block 13 is equal to the width of the seat inner groove 15, so the locking block 13 can only move forward and backward but not left and right.

[0029] In this embodiment, a decorative gland 4 with a gland pipe hole 3 at the front is provided above the base 1. The decorative gland 4 is fixedly connected to the base 1 by screws. The function of the decorative gland 4 is to close the top, play a decorative role, and make the appearance more tidy.

[0030] See also Figure 3 and Figure 4 In this embodiment, a screw hole 14 is provided on the top of the base 1 and the screw hole 14 is a stepped hole, a positioning boss 18 is provided at the corresponding position of the rear bottom of the decorative pressure cover 4, and an assembly hole 5 is provided at the center position of the positioning boss 18. Anti-dismantling screws are provided in the assembly hole 5 and the screw hole 14 to fix the decorative pressure cover 4 to the base 1. The purpose of using anti-dismantling screws for connection is to avoid arbitrary disassembly and assembly, and only personnel holding special tools can perform disassembly and assembly.

[0031] By providing a positioning boss 18 corresponding to the screw hole 14, the decorative gland 4 is positioned when installed on the base 1, so that the gland tube hole 3 is aligned with the base tube hole 12 below in the longitudinal direction. Furthermore, the assembly hole 5 can be a stepped countersunk hole, so that the nail cap part of the anti-tampering screw used to fix the decorative gland 4 to the base 1 is located in the countersunk hole, thereby avoiding exposure, further improving the neatness of the appearance.

[0032] For usage, see Figure 6 :

[0033] Insert the base connection part 2 of the base 1 into the upper end of the frame tube 21 below and weld it, insert the first fork arm connection part 8 of the first fork arm 7 into the upper end of the first fork 19 and weld it, insert the second fork arm connection part 11 of the second fork arm 10 into the upper end of the second fork 20 and weld it, then the seat tube locking structure is assembled with the main part of the frame; insert the seat tube of the seat assembly into the interior of the locking structure from top to bottom, let the seat tube pass through the gland tube hole 3 and the base tube hole 12 in turn, adjust the seat to a suitable height, first use a tool to rotate the locking screw to provide downward pressure to the locking block 13, and the locking block 13 moves forward under the cooperation of the conical surface during the process of being pressed downward, so as to have a locking effect of squeezing and fixing the front seat tube, and then use a tool to rotate and tighten the anti-disassembly screw to combine the decorative gland 4 with the base 1 as a whole.

Claims

1. A seat tube locking structure for a bicycle, characterized by: The invention comprises a base (1) with a base tube hole (12) running longitudinally through the front, a first fork arm (7) and a second fork arm (10) being arranged opposite to each other at the rear of the base (1), a seat inner groove (15) being arranged inside the base (1) and behind the base tube hole (12), a locking block (13) being arranged in the seat inner groove (15), the front of the locking block (13) having an arc-shaped vertical surface (13-1) cooperating with the seat tube, and the rear of the locking block (13) having a block rear inclined surface (13- 4), an inner groove inclined surface (16) matched with the rear inclined surface (13-4) of the block is provided at the rear portion of the inner groove (15) of the seat, an upper groove (13-2) of the block is provided at the middle portion of the locking block (13), a vertically penetrating strip hole (13-3) is provided at the bottom of the upper groove (13-2), a groove bottom threaded hole (17) is provided at the bottom of the inner groove (15) of the seat, and a locking screw is also included, the locking screw passes through the strip hole (13-3) and the lower end of the locking screw is located in the groove bottom threaded hole (17).

2. The seat tube locking structure for a bicycle as claimed in claim 1, characterized in that: A decorative gland (4) having a gland pipe hole (3) at the front is provided above the base (1), and the decorative gland (4) is fixedly connected to the base (1) by means of screws.

3. The seat tube locking structure for a bicycle as claimed in claim 2, characterized in that: A screw hole (14) is provided at the top of the base (1) and the screw hole (14) is a stepped hole. A positioning boss (18) is provided at a corresponding position at the rear bottom of the decorative pressure cover (4). An assembly hole (5) is provided at the center of the positioning boss (18). Anti-disassembly screws are provided in the assembly hole (5) and the screw hole (14) to fix the decorative pressure cover (4) to the base (1).

4. The seat tube locking structure for a bicycle as claimed in claim 3, characterized in that: The base (1) and the first fork arm (7) and the second fork arm (10) are integrally formed structures. A base connection portion (2) protruding downward is provided at the bottom of the base (1). The base connection portion (2) is embedded in the upper end of the frame tube (21) and is welded.

5. The seat tube locking structure for a bicycle as claimed in claim 4, characterized in that: A first fork arm connecting portion (8) having a first positioning block (6) on its side wall is provided at the rear end of the first fork arm (7), and a second fork arm connecting portion (11) having a second positioning block (9) on its side wall is provided at the rear end of the second fork arm (10). The first fork arm connecting portion (8) and the second fork arm connecting portion (11) are respectively inserted into the upper ends of the first upright fork (19) and the second upright fork (20) and are welded together.

Images