Hidden seat post fixing mechanism, vertical pipe assembly and bicycle

Abstract

The utility model belongs to the field of bicycles, and discloses a hidden type seat post fixing mechanism, a stand pipe assembly and a bicycle, the hidden type seat post fixing mechanism comprises a locking frame arranged on a stand pipe, the locking frame is provided with a locking block fixing cavity, a locking block and a locking screw are arranged in the locking block fixing cavity, and the locking block is used for pressing a seat post; a screw head of the locking screw is located at the opening of the lower side of the locking frame and abuts against the locking frame in the axial direction, and a screw rod of the locking screw extends into the locking frame and is in threaded connection fit with the locking block. The utility model has the advantages of convenient installation, convenient operation, safety and reliability.

Description

Technical Field

[0001] This utility model relates to the field of bicycles, specifically a concealed seatpost fixing mechanism, a stem assembly, and a bicycle. Background Technology

[0002] The seatpost and seat tube of a bicycle are usually detachable, allowing for adjustments and replacements to accommodate different seat heights. The seatpost is secured to the seat tube with a locking mechanism. The seatpost is inserted into the seat tube from top to bottom, and the locking mechanism is located at the top of the seat tube. After insertion, the locking mechanism must be used to lock the seatpost in place, ensuring it cannot be pulled out of the seat tube without being unlocked.

[0003] Existing locking mechanisms have various structures, such as those using locking rings for fixation. However, these mechanisms are prone to loosening, and while convenient to operate by hand, they are also easily stolen. Some solutions propose using screws for locking, but this still presents challenges, such as the screws being susceptible to the influence of rain and dust, making unlocking difficult. Utility Model Content

[0004] The purpose of this invention is to provide a concealed seat post fixing mechanism, a riser assembly, and a bicycle to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A concealed seat post fixing mechanism, comprising:

[0007] A locking bracket installed on the riser has a locking block fixing cavity, in which a locking block and a locking screw are installed. The locking block is used to press the seat rod. The screw head of the locking screw is located at the opening on the lower side of the locking bracket, and the screw head abuts against the locking bracket in the axial direction. The screw rod of the locking screw extends into the locking bracket and is screwed into the locking block.

[0008] Furthermore, the locking frame is hollowed out on the side facing the riser, allowing the locking block to contact the seat rod. The inner wall of the locking block fixing cavity on the side away from the riser is provided with a first ramp structure, which gradually approaches the riser from top to bottom. The locking block on the side facing away from the riser is provided with a second ramp structure that matches the first ramp structure. The first ramp structure and the second ramp structure fit together, and the locking block can slide up and down along the first ramp structure in the locking block fixing cavity.

[0009] Furthermore, the locking bracket is also provided with a countersunk hole and a screw mounting hole. The countersunk hole, the screw mounting hole and the locking block fixing cavity are connected in sequence. The countersunk hole is used to accommodate the screw head of the locking screw. The screw head abuts against the inner wall of the countersunk hole in the axial direction. The screw mounting hole is for the screw of the locking screw to pass through.

[0010] Furthermore, the countersunk hole is clearance-fitted with the screw head of the locking screw, and the screw mounting hole is clearance-fitted with the screw of the locking screw.

[0011] Furthermore, the locking block is provided with an inclined threaded hole for screwing with the locking screw. The locking block is provided with a guide surface and a pressing surface on the side facing the riser, respectively. The guide surface is a slope structure or a curved surface structure to guide the seat rod to be inserted into the riser, and the pressing surface is used to press the seat rod.

[0012] Furthermore, the shape of the pressing surface matches the shape of the outer circumferential surface of the seat rod.

[0013] Furthermore, the locking screw is inclined or vertically arranged, and its screw head is provided with a tightening hole for cooperating with a wrench.

[0014] Furthermore, the upper end of the locking frame is provided with a first opening that communicates with the fixing cavity of the locking block.

[0015] This utility model also provides a riser assembly, including a riser and a concealed seat rod fixing mechanism as described above. The cavity of the riser is used to accommodate the seat rod. The concealed seat rod fixing mechanism is disposed on the riser, and the riser locks the seat rod through the concealed seat rod fixing mechanism. The riser has a second opening corresponding to the locking block on the side facing the locking block.

[0016] This utility model also provides a bicycle, including a seat tube assembly as described above; it also includes a top tube, a concealed seat post fixing mechanism is disposed at the connection between the top tube and the seat tube, and the countersunk hole is exposed from the bottom of the top tube.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1) Design a new locking bracket structure that allows the locking block and locking screw to move smoothly, enabling locking and unlocking, facilitating the installation of the locking block and locking screw, and fixing the seat post.

[0019] 2) The locking block's structure facilitates seat post insertion and self-locks during seat post use. Even if the screws loosen, it remains locked and does not affect riding safety.

[0020] 3) This utility model has a compact structure, allowing it to be installed entirely inside the top tube of a bicycle. The orientation of the countersunk hole and the screw mounting hole conceals the locking screw, making it difficult to observe during daily use and improving the overall aesthetics of the vehicle. The concealed structure does not affect the overall appearance of the vehicle and is less likely to be seen by others, reducing the possibility of seat theft. The top tube of various bicycle models can be completely encased and concealed by this utility model.

[0021] 4) The opening direction of the screw head can reduce the impact of rainwater, dust and other factors on the locking screw, thereby reducing the difficulty of unlocking later. Attached Figure Description

[0022] Figure 1 This is a longitudinal cross-sectional schematic diagram of the connection structure between the concealed seat post fixing mechanism of this utility model and the riser, seat post, and seat.

[0023] Figure 2 This is one of the longitudinal cross-sectional schematic diagrams of the connection structure between the concealed seat rod fixing mechanism and the riser and seat rod of this utility model. In the figure, the concealed seat rod fixing mechanism is in a locked state.

[0024] Figure 3 This is the second longitudinal cross-sectional schematic diagram of the connection structure between the concealed seat rod fixing mechanism and the riser and seat rod of this utility model. In the figure, the concealed seat rod fixing mechanism is in the unlocked state.

[0025] Figure 4 This is a schematic diagram showing the connection structure between the concealed seat rod fixing mechanism and the riser of this utility model.

[0026] Figure 5 This is a schematic diagram of the connection structure between the locking bracket and the riser of this utility model.

[0027] Figure 6 This is one of the three-dimensional structural diagrams of the locking frame of this utility model.

[0028] Figure 7 This is the second schematic diagram of the three-dimensional structure of the locking frame of this utility model.

[0029] Figure 8 This is a three-dimensional structural diagram of the connection between the locking block and the locking screw of this utility model.

[0030] Figure 9 This is a schematic diagram of the locking block structure of this utility model.

[0031] In the picture:

[0032] Concealed seat post fixing mechanism 1, locking bracket 100, locking block fixing cavity 1000, first ramp structure 1001, countersunk hole 1002, screw mounting hole 1003, first opening 1004, locking block 101, second ramp structure 1010, threaded hole 1011, guide surface 1012, pressing surface 1013, locking screw 102, screw head 1020, screw 1021, tightening hole 1022, riser 2, second opening 200, seat post 3, seat 4. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Please see Figures 1-9 A concealed seat post fixing mechanism includes a locking frame 100, a locking block 101, and a locking screw 102. The locking frame 100 is welded or bolted to the riser 2. Alternatively, the locking frame 100 can be snapped onto the riser 2 using a known snap-fit ​​and slot structure. The locking frame 100 has a locking block fixing cavity 1000, within which the locking block 101 and the locking screw 102 are disposed. The locking block 101 is used to press the seat post 3. The screw head 1020 of the locking screw 102 is located at an opening on the lower side of the locking frame 100, allowing for manual operation. The screw head 1020 abuts against the locking frame 100 axially. The screw shank 1021 of the locking screw 102 is upwardly positioned and extends into the locking frame 100, engaging with the locking block 101. The concealed seat post fixing mechanism 1 uses the rotating locking screw 102 to move the locking block 101 closer to or further away from the seat post 3, thereby locking or unlocking the seat post 3 with the locking block 101.

[0035] It is understood that in the above technical solution, the present invention adjusts the insertion depth of the locking screw 102 into the locking block 101, thereby adjusting the distance between the locking block 101 and the riser cavity, so as to lock or unlock the seat rod 3 inserted into the riser cavity. The structure is simple and the operation is convenient. Moreover, the screw head 1020 of the locking screw 102 is set downward, which is not easily corroded by rainwater and dust.

[0036] Continue reading Figures 2-5 , Figures 8-9In one embodiment of this utility model, the locking frame 100 is hollowed out on the side facing the riser 2, allowing the locking block 101 to penetrate into the riser cavity and contact the seat rod 3. The inner wall of the locking block fixing cavity 1000 away from the riser 2 is provided with a first slope structure 1001, which gradually approaches the riser 2 from top to bottom. The side of the locking block 101 facing away from the riser 2 is provided with a second slope structure 1010 that matches the first slope structure 1001, which also gradually approaches the riser 2 from top to bottom. The first slope structure 1001 and the second slope structure 1010 fit together, and the size of the locking block fixing cavity 1000 is larger than the size of the locking block 101. The locking block 101 can slide up and down along the first slope structure 1001 in the locking block fixing cavity 1000 by relying on the second slope structure 1010.

[0037] It is understandable that the inner wall of the locking block fixing cavity 1000, facing away from the riser tube 2, has a sloping structure, with the slope direction descending towards the riser tube cavity. The locking block 101 also fits the structure of the locking block fixing cavity 1000. Therefore, even if the locking screw 102 accidentally loosens, due to the sloping structure, the wedge-shaped locking block 101 will tend to slide downwards. At this time, due to the weight of the seat post 3 or the weight of the rider sitting on the seat post 3, friction will drive the locking block 101 downwards, thus allowing the locking block 101 to continue to clamp and limit the seat post 3 at the bottom of the locking block fixing cavity 1000, preventing the seat post 3 from loosening and affecting the locking effect.

[0038] Continue reading Figure 5 In one embodiment of this utility model, the lower end of the locking bracket 100 is further provided with a countersunk hole 1002 and a screw mounting hole 1003. The countersunk hole 1002, the screw mounting hole 1003, and the locking block fixing cavity 1000 are connected in sequence. The countersunk hole 1002 is used to accommodate the screw head 1020 of the locking screw 102. The screw head 1020 abuts against the countersunk hole 1002 in the axial direction. The screw mounting hole 1003 allows the screw 1021 of the locking screw 102 to pass through. In this utility model, the countersunk hole 1002 and the screw mounting hole 1003 are inclined as a whole, and their axes gradually approach the riser 2 from bottom to top. Correspondingly, the locking screw 102 is also inclined. During installation, the locking screw 102 is inserted into the locking bracket 100 from one end of the countersunk hole 1002 and screwed into the locking block 101.

[0039] Accordingly, the bottom-up design of the countersunk hole 1002, the screw mounting hole 1003, and the locking block fixing cavity 1000 ensures that the locking screw 102 is inserted into the locking block 101 from bottom to top. This prevents the locking screw 102 from being affected by rainwater or dust during daily use, reducing the likelihood of corrosion between the locking screw 102 and the locking block 101, and ensuring smooth assembly and disassembly. Simultaneously, the locking screw 102 is located on the lower side, making it less likely to be observed, reducing the possibility of unauthorized personnel attempting to disassemble it.

[0040] In addition, the countersunk hole 1002 provides axial limit for the locking screw 102. When the locking screw 102 is tightened, the locking screw 102 cannot be screwed upward in the axial direction. Instead, the locking block 101 can only move downward along the ramp structure, thereby allowing the locking block 101 to approach and press against the seat rod 3.

[0041] In another embodiment of this utility model, the locking screw 102, the countersunk hole 1002, and the screw mounting hole 1003 are all vertically arranged, and the screw head 1021 of the locking screw 102 is still arranged downwards.

[0042] Continue reading Figure 4 and Figure 5 In one embodiment of this utility model, the countersunk hole 1002 is clearance-fitted with the screw head 1020 of the locking screw 102, that is, the size of the countersunk hole 1002 is larger than the size of the screw head 1020 in the radial direction. The screw mounting hole 1003 is clearance-fitted with the screw 1021 of the locking screw 102, that is, the size of the screw mounting hole 1003 is larger than the size of the screw 1021 in the radial direction. Accordingly, the locking screw 102 has radial movement space on the locking bracket 100 (in the direction where the locking block 101 is close to or far from the riser 2), so that when the concealed seat rod fixing mechanism 1 is locked, the locking screw 102 and the locking block 101 can move down together (the movement distance is small enough to achieve fixation, so as to reduce the rotation time), and at the same time, so that the locking screw 102 is aligned with the threaded hole 1011 of the locking block 101.

[0043] More specifically, such as Figure 7 As shown, the countersunk hole 1002 and the screw mounting hole 1003 are both waist-shaped hole structures, that is, the two sides are semi-circular arcs, and the middle is provided with a straight line or other shape extension.

[0044] Continue reading Figure 8 and Figure 9In one embodiment of this utility model, the locking block 101 is provided with an inclined threaded hole 1011 for screwing with the locking screw 102. The threaded hole 1011 is connected to the screw mounting hole 1003. The inclination direction and angle of the threaded hole 1011 correspond to the aforementioned countersunk hole 1002 and screw mounting hole 1003. The locking block 101 is provided with a guide surface 1012 and a pressing surface 1013 on the side facing the riser 2, respectively. The guide surface 1012 is a slope structure or a curved surface structure, that is, the distance from the upper part of the guide surface 1012 to the pressing surface 1013 is greater. The slope structure or curved surface structure gradually approaches the axis of the riser 2 from top to bottom to guide the seat rod 3 to be inserted into the riser 2. The shape of the pressing surface 1013 matches the shape of the outer peripheral surface of the seat rod 3 and is used to press the seat rod 3.

[0045] It is understandable that the locking block 101 is provided with a guide surface 1012. When the seat rod 3 needs to be installed, it can be guided into the riser tube 2 from top to bottom by the guide surface 1012. The seat rod 3 will not be difficult to insert because the locking block 101 is in a loose state (when the locking screw 102 is not tightened, the locking block 101 will naturally move downwards towards the center of the riser tube 2 due to gravity).

[0046] Continue reading Figures 2-6 In one embodiment of this utility model, the upper end of the locking bracket 100 is provided with a first opening 1004 communicating with the locking block fixing cavity 1000. When the concealed seat rod fixing mechanism 1 is in the unlocked state, the locking block 101 blocks the first opening 1004. When the concealed seat rod fixing mechanism 1 is in the locked state, the locking block 101 will move down to the lowest position. The first opening 1004 is a process hole, which plays a role in weight reduction and material saving.

[0047] It should be noted that a top tube (not shown in the figure) connects the bicycle's seat tube 2 and head tube. The installation position of the concealed seat post fixing mechanism 1 of this utility model is located directly below the top tube. The aforementioned first opening 1004 is inside the top tube, and the top tube covers the first opening 1004, preventing water from entering the first opening 1004. In some embodiments, if the bicycle does not have a top tube, the first opening 1004 can be omitted, ensuring that dust, rainwater, and other debris do not enter the upper part of the locking bracket 100.

[0048] Continue reading Figure 2 and Figure 3 In one embodiment of this utility model, the screw head 1020 of the locking screw 102 is provided with a screw hole 1022 for cooperating with a wrench. The screw hole 1022 is preferably an internal hexagonal hole, but it can also be designed as a square hole, a triangular hole, a slotted slot, a cross slot, etc.

[0049] Usage: In daily use, adjusting the locking screw 102 outwards will unlock the seat rod 3. At this point, pull out the seat rod 3, or adjust it to a suitable height. When it is necessary to install the locking seat rod 3, insert it into the riser cavity. The bottom of the seat rod 3 will follow the guide surface 1012 into the pressing surface 1013. After reaching the predetermined position, tighten the locking block 101. As the locking screw 102 tightens, the locking block 101 will move to the lower right side of the locking block fixing cavity 1000, thereby achieving a tight fixation of the seat rod 3 (refer to...). Figure 3 Transformation to Figure 2 (state).

[0050] Please see Figure 1 The present invention also provides a riser assembly, including a riser 2 and a concealed seat rod fixing mechanism 1 as described above. The cavity of the riser 2 is used to accommodate the seat rod 3. The concealed seat rod fixing mechanism 1 is disposed at the upper end of the riser 2, and the riser 2 locks the seat rod 3 through the concealed seat rod fixing mechanism 1.

[0051] Among them, the riser 2 has a second opening 200 corresponding to the locking block 101 on the side facing the locking block 101. When the hidden seat rod fixing mechanism 1 is locked, the locking block 101 extends into the second opening 201 and presses the seat rod 3.

[0052] This utility model also provides a bicycle, which includes a top tube and a seat tube assembly as described above. A concealed seatpost fixing mechanism 1 is disposed at the connection between the top tube and the seat tube 2, and a countersunk hole 1002 protrudes from the bottom of the top tube. The top tube is a common structure in the bicycle industry, and is generally disposed between the seat tube and the head tube to increase the overall strength of the frame.

[0053] Similarly, this invention is also applicable to other multi-wheeled human-powered bicycles, electric bicycles, E-bikes, motorcycles, etc., to meet the locking requirements of the seat post.

[0054] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A concealed seat post fixing mechanism, characterized in that, include: A locking frame (100) is installed on the riser (2). The locking frame (100) has a locking block fixing cavity (1000). A locking block (101) and a locking screw (102) are installed in the locking block fixing cavity (1000). The locking block (101) is used to press the seat rod (3). The screw head (1020) of the locking screw (102) is located at the opening on the lower side of the locking frame (100). The screw head (1020) abuts against the locking frame (100) in the axial direction. The screw rod (1021) of the locking screw (102) extends into the locking frame (100) and is screwed into the locking block (101).

2. The concealed seat post fixing mechanism according to claim 1, characterized in that, The locking frame (100) is hollowed out on the side facing the riser (2) so that the locking block (101) can contact the seat rod (3). The inner wall of the locking block fixing cavity (1000) away from the riser (2) is provided with a first slope structure (1001). The first slope structure (1001) gradually approaches the riser (2) from top to bottom. The locking block (101) is provided with a second slope structure (1010) matching the first slope structure (1001) on the side facing away from the riser (2). The first slope structure (1001) and the second slope structure (1010) fit together. The locking block (101) can slide up and down along the first slope structure (1001) in the locking block fixing cavity (1000).

3. The concealed seat post fixing mechanism according to claim 2, characterized in that, The locking bracket (100) is also provided with a countersunk hole (1002) and a screw mounting hole (1003). The countersunk hole (1002), the screw mounting hole (1003) and the locking block fixing cavity (1000) are connected in sequence. The countersunk hole (1002) is used to accommodate the screw head (1020) of the locking screw (102). The screw head (1020) abuts against the inner wall of the countersunk hole (1002) in the axial direction. The screw mounting hole (1003) is for the screw (1021) of the locking screw (102) to pass through.

4. The concealed seat post fixing mechanism according to claim 3, characterized in that, The countersunk hole (1002) is clearance-fitted with the screw head (1020) of the locking screw (102), and the screw mounting hole (1003) is clearance-fitted with the screw (1021) of the locking screw (102).

5. The concealed seat post fixing mechanism according to claim 1, characterized in that, The locking block (101) is inclinedly provided with a threaded hole (1011) for screwing with the locking screw (102). The locking block (101) is provided with a guide surface (1012) and a pressing surface (1013) on the side facing the riser (2). The guide surface (1012) is a slope structure or a curved surface structure, which is used to guide the seat rod (3) to be inserted into the riser (2). The pressing surface (1013) is used to press the seat rod (3).

6. The concealed seat post fixing mechanism according to claim 5, characterized in that, The shape of the pressing surface (1013) matches the shape of the outer circumferential surface of the seat rod (3).

7. The concealed seat post fixing mechanism according to claim 1, characterized in that, The locking screw (102) is inclined or vertical, and its screw head (1020) is provided with a screw hole (1022) for cooperating with a wrench.

8. The concealed seat post fixing mechanism according to claim 1, characterized in that, The upper end of the locking frame (100) is provided with a first opening (1004) that communicates with the locking block fixing cavity (1000).

9. A riser assembly, characterized in that, Includes a riser (2) and a concealed seat rod fixing mechanism (1) as described in any one of claims 1-8, wherein the cavity of the riser (2) is used to accommodate the seat rod (3); the concealed seat rod fixing mechanism (1) is disposed on the riser (2), and the riser (2) locks the seat rod (3) through the concealed seat rod fixing mechanism (1), and the riser (2) has a second opening (200) corresponding to the locking block (101) on the side facing the locking block (101).

10. A bicycle, characterized in that, It includes a riser assembly as described in claim 9; it also includes an upper pipe, a concealed seat rod fixing mechanism (1) is provided at the connection between the upper pipe and the riser (2), and the countersunk hole (1002) is exposed from the bottom of the upper pipe.

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