Seat tube locking structure

Abstract

The utility model discloses a seat tube locking structure which comprises a U-shaped seat tube bundle, the two ends of the seat tube bundle are clamped through a clamping device, and the clamping device comprises a rotating handle which is arranged on the outer side of one end of the seat tube bundle, rotates relative to the seat tube bundle and can compress and enlarge the distance between the two ends of the seat tube bundle. A locking nut is arranged on the outer side of the other end of the seat tube bundle, a bolt is arranged on one side of the rotating handle, and the bolt sequentially penetrates through the rotating handle and the two ends of the seat tube bundle and then is connected with the locking nut. The adjustable seat tube bundle has the advantages that the adjustable seat tube bundle can effectively solve the problem that an existing adjustable seat tube bundle mainly adopts the design that a wrench force arm is short, large operation force is needed, and a user with weak force is inconvenient to operate.

Description

Technical Field

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

[0002] With the popularity of bicycles and electric bicycles as a means of fitness and short-distance travel, riders of different heights have different requirements for saddle height adjustment;

[0003] Existing adjustable seatposts mostly use a design with a short wrench lever arm, which requires a large operating force. This makes operation inconvenient for users with relatively weak strength, especially female riders. Utility Model Content

[0004] The seat tube locking structure provided by the utility model solves the existing problems.

[0005] In order to achieve the above-mentioned object, the present invention adopts the following technical solution: a seat tube locking structure, comprising a U-shaped seat tube bundle, wherein both ends of the seat tube bundle are clamped by a clamping device, the clamping device comprising a rotating handle arranged on the outside of one end of the seat tube bundle, which rotates relative to the seat tube bundle and can compress and expand the distance between the two ends of the seat tube bundle, a locking nut is arranged on the outside of the other end of the seat tube bundle, and a bolt is arranged on one side of the rotating handle, which passes through the rotating handle and the two ends of the seat tube bundle in sequence and is connected to the locking nut.

[0006] Two first bosses are provided on the side of the rotating handle facing the seat tube bundle, which are symmetrical along the central axis of the bolt. The cross-section of the first boss along the circumferential direction of the bolt is trapezoidal. Two second bosses are provided on the end of the seat tube bundle facing the rotating handle, which are symmetrical along the central axis of the bolt. The cross-section of the second boss along the circumferential direction of the bolt is trapezoidal, and the trapezoidal upper end surfaces of the first boss and the second boss abut against each other.

[0007] A first limiting convex strip is provided on one side of the trapezoidal upper end surface of the first boss, and a second limiting convex strip matching the first limiting convex strip is provided on one side of the trapezoidal upper end surface of the second boss.

[0008] A cylindrical first slider is fixed on the rotating handle, a cylindrical second slider is fixed on the seat tube bundle, a first boss and a first limiting convex strip are arranged on the first slider, and a second boss and a second limiting convex strip are arranged on the second slider.

[0009] A cylindrical first slider is fixed on the rotating handle, a cylindrical second slider is fixed on the seat tube bundle, the first boss is arranged on the first slider, and the second boss is arranged on the second slider.

[0010] A second circular groove is provided on the outer side surface of one end of the seat tube bundle, a straight second sliding groove is provided in the second circular groove, a straight second protrusion is provided on the second slider, the second slider is located in the second circular groove and the second protrusion is inserted into the second sliding groove, a first circular groove is provided on the rotating handle, a straight first sliding groove is provided in the first circular groove, a straight first protrusion is provided on the first slider, the first slider is located in the first circular groove and the first protrusion is inserted into the first sliding groove.

[0011] A gasket is provided between the rotating handle and the bolt head, and the gasket and the rotating handle are connected via a ball bearing.

[0012] The beneficial effects of the present invention are as follows: the device reduces the force required to open the seat tube clamp by lengthening the operating rod portion of the rotating handle, so as to be suitable for use by people with weaker strength; the user only needs to pull the rotating handle and use the sloped surface of the boss on the slider to slide from a high point to a low point, and stop when sliding to the opening limit plane, to complete the loosening operation of the seat tube clamp, so that the user can adjust the seat tube up and down; if locking is required, the user can pull the rotating handle and use the sloped surface of the boss to slide from a low point to a high point, and slide until it stops, to complete the locking operation of the seat tube clamp; at the same time, a ball is placed between the gasket and the rotating handle, and the round feature of the ball ensures that the rotating handle is not affected by resistance during the opening and closing process, so that female cyclists and cyclists with weaker strength can also easily adjust the seat tube height. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the present utility model.

[0014] Figure 2 This is a schematic diagram of the structural disassembly of the present utility model.

[0015] Figure 3 This is a schematic diagram of the disassembly of parts of the utility model.

[0016] Figure 4 This is a schematic diagram of the seat tube bundle of the present invention.

[0017] Figure 5 This is a schematic diagram of the first slider of the present invention.

[0018] Figure 6 This is a schematic diagram of the rotary handle of the present utility model.

[0019] Figure 7 It is a schematic diagram of the gasket of the present utility model.

[0020] Figure 8 This is a schematic diagram of the second sliding block of the present invention.

[0021] In the figure: 1. Seat tube clamp; 2. Rotating handle; 3. Locking nut; 4. Bolt; 5. First boss; 6. Second boss; 7. First limiting rib; 8. Second limiting rib; 9. Seat tube; 10. Frame center tube; 11. First slider; 12. Second slider; 13. First protrusion; 14. Second protrusion; 15. First slide groove; 16. Second slide groove; 17. First circular groove; 18. Second circular groove; 19. Ball; 20. Gasket; 21. Washer; 22. Ball groove; 23. Ball slide groove. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0023] Reference Figure 1-Figure 7 A seat tube locking structure includes a U-shaped seat tube bundle 1, the two ends of which are clamped by a clamping device. The clamping device includes a rotating handle 2 arranged on the outside of one end of the seat tube bundle 1 and rotating relative to the seat tube bundle 1 and capable of compressing and expanding the distance between the two ends of the seat tube bundle 1. A locking nut 3 is arranged on the outside of the other end of the seat tube bundle 1, and a bolt 4 is arranged on one side of the rotating handle 2. The bolt 4 passes through the rotating handle 2 and the two ends of the seat tube bundle 1 in sequence and is connected to the locking nut 3.

[0024] The side of the rotating handle 2 facing the seat tube bundle 1 is provided with two first bosses 5 that are centrally symmetrical along the central axis of the bolt 4. The cross-section of the first boss 5 along the circumferential direction of the bolt 4 is trapezoidal. The end of the seat tube bundle 1 facing the rotating handle 2 is provided with two second bosses 6 that are centrally symmetrical along the central axis of the bolt 4. The cross-section of the second boss 6 along the circumferential direction of the bolt is trapezoidal. The trapezoidal upper end surfaces of the first boss 5 and the second boss 6 abut against each other.

[0025] In order to help users know when the tube bundle is locked, a first limiting ridge 7 is provided on one side of the trapezoidal upper end surface of the first boss 5, and a second limiting ridge 8 that cooperates with the first limiting ridge 7 is provided on one side of the trapezoidal upper end surface of the second boss 6.

[0026] like Figure 5 and Figure 8As shown, in order to facilitate installation and parts processing, a cylindrical first slider 11 is fixed to the rotating handle 2, and a cylindrical second slider 12 is fixed to the seat tube bundle 1. The first boss 5 and the first limiting ridge 7 are set on the first slider 11. When the first limiting ridge 7 is actually produced, two can be set and they are symmetrical along the center axis of the bolt 4. The second boss 6 and the second limiting ridge 8 are set on the second slider 12. When the second limiting ridge 8 is actually produced, two can be set and they are symmetrical along the center axis of the bolt 4. The fixing method of the first slider 11 and the second slider 12 can be adopted Figure 2 、 Figure 3 The structure comprises a second circular groove 18 provided on the outer surface of one end of the seat tube bundle 1, a straight second groove 16 provided in the second circular groove 18, a straight second protrusion 14 provided on the second slider 12, the second slider 12 is located in the second circular groove 18 and the second protrusion 14 is inserted into the second groove 16, a first circular groove 17 is provided on the rotating handle 2, a straight first groove 15 is provided in the first circular groove 17, a straight first protrusion 13 is provided on the first slider 11, the first slider 11 is located in the first circular groove 17 and the first protrusion 13 is inserted into the first groove 15.

[0027] In order to ensure that the rotating handle 2 rotates flexibly, a gasket 20 is provided between the rotating handle 2 and the head of the bolt 4. The gasket 20 and the rotating handle 2 are connected by the ball 19. The gasket 20 is provided with a ball groove 22 with an aperture smaller than the diameter of the ball 19. The ball 19 is located in the ball groove 22. The rotating handle 2 is provided with a ball slide groove 23 for facilitating the rolling of the ball 19, which is beneficial for the ball 19 to not get stuck or misaligned when rolling.

[0028] Working principle: First, the traditional short lever arm wrench is changed to design the rotating handle 2 into a semicircular long lever arm, so that the user needs to exert less force during operation. When using, the user adjusts the height of the seat tube 9 as needed, such as Figure 1 As shown, it is in the locked state at this time, the trapezoidal upper end surfaces of the first boss 5 and the second boss 6 are against each other, and the distance between the rotating handle 2 and the second slider 12 is the largest, as shown in FIG. Figure 2As shown, the user holds the rotating handle 2 and pulls it upward. At this time, the rotating handle 2 drives the rotating handle 2 to rotate through the lever principle. Since the second boss 6 is fixed, the trapezoidal upper end surfaces of the first boss 5 and the second boss 6 first move and slide relative to each other. When the trapezoidal upper end surfaces of the first boss 5 and the second boss 6 are disengaged, the trapezoidal waist end surfaces of the first boss 5 and the second boss 6 contact and slide relative to each other. At this time, the axial distance between the first slider 11 and the second slider 12 is relatively shortened. Since the distance between the rotating handle 2 and the head of the bolt 4 is fixed, the second slider 12 gradually approaches the rotating handle 2. In this way, the distance between the two ends of the seat tube bundle 1 will expand under the action of its own elasticity, thereby realizing the opening of the end of the frame middle tube 10, and the seat tube 9 can move up and down in the frame middle tube 10, thereby realizing adjustment. After adjustment, to tighten, simply turn the handle 2 downward. The process is the reverse of the previous one. When the first stop rib 7 and the second stop rib 8 abut against each other, the handle 2 stops rotating. At this point, the trapezoidal upper end surfaces of the first and second bosses 5 and 6 abut against each other, locking the frame center tube 10 against the seat tube 9. Because the process is relatively smooth, even women with less strength can easily tighten and loosen the seat tube.

Claims

1. A seat tube locking structure comprising a U-shaped seat tube assembly, characterized in that: The two ends of the seat tube bundle are clamped by a clamping device, which includes a rotating handle arranged on the outside of one end of the seat tube bundle and rotating relative to the seat tube bundle and capable of compressing and expanding the distance between the two ends of the seat tube bundle. A locking nut is arranged on the outside of the other end of the seat tube bundle, and a bolt is arranged on one side of the rotating handle. The bolt passes through the rotating handle and the two ends of the seat tube bundle in sequence and is connected to the locking nut.

2. The seat tube locking structure according to claim 1, characterized in that: Two first bosses are provided on the side of the rotating handle facing the seat tube bundle, which are symmetrical along the central axis of the bolt. The cross-section of the first boss along the circumferential direction of the bolt is trapezoidal. Two second bosses are provided on the end of the seat tube bundle facing the rotating handle, which are symmetrical along the central axis of the bolt. The cross-section of the second boss along the circumferential direction of the bolt is trapezoidal, and the trapezoidal upper end surfaces of the first boss and the second boss abut against each other.

3. The seat tube locking structure according to claim 2, characterized in that: A first limiting convex strip is provided on one side of the trapezoidal upper end surface of the first boss, and a second limiting convex strip matching the first limiting convex strip is provided on one side of the trapezoidal upper end surface of the second boss.

4. The seat tube locking structure according to claim 3, characterized in that: A cylindrical first slider is fixed on the rotating handle, a cylindrical second slider is fixed on the seat tube bundle, a first boss and a first limiting convex strip are arranged on the first slider, and a second boss and a second limiting convex strip are arranged on the second slider.

5. The seat tube locking structure according to claim 2, characterized in that: A cylindrical first slider is fixed on the rotating handle, a cylindrical second slider is fixed on the seat tube bundle, the first boss is arranged on the first slider, and the second boss is arranged on the second slider.

6. The seat tube locking structure according to claim 4 or 5, characterized in that: A second circular groove is provided on the outer side surface of one end of the seat tube bundle, a straight second sliding groove is provided in the second circular groove, a straight second protrusion is provided on the second slider, the second slider is located in the second circular groove and the second protrusion is inserted into the second sliding groove, a first circular groove is provided on the rotating handle, a straight first sliding groove is provided in the first circular groove, a straight first protrusion is provided on the first slider, the first slider is located in the first circular groove and the first protrusion is inserted into the first sliding groove.

7. The seat tube locking structure according to claim 1, characterized in that: A gasket is provided between the rotating handle and the bolt head, and the gasket and the rotating handle are connected via a ball bearing.

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