Head tube folding mechanism and bicycle

Abstract

The utility model relates to the technical field of bicycles, and particularly discloses a head tube folding mechanism and a bicycle, the head tube folding mechanism comprises a first connecting piece, a second connecting piece, a torsion spring, a connecting buckle and an unlocking assembly; a mounting table is arranged at the upper end of the first connecting piece; the first connecting piece is further provided with a hinge part hinged to the second connecting piece. A connecting cavity with an opening in the lower end is formed in the second connecting piece, and a connecting plate is arranged in the connecting cavity; the second connecting piece has a supporting position and a folding position; one end of the connecting buckle is hinged to the mounting table through a connecting shaft, the other end of the connecting buckle is provided with a lock catch clamped with the connecting plate, and the connecting shaft is sleeved with the torsional spring; when the second connecting piece is located at the supporting position, the lock catch is arranged in the connecting cavity and connected with the connecting plate in a clamped mode, and when the second connecting piece is located at the folding position, the lock catch is separated from the connecting cavity. The unlocking assembly is installed on the side wall of the second connecting piece and is in driving connection with the lock catch, and clamping connection between the lock catch and the connecting plate can be relieved through the unlocking assembly.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of bicycle, especially a folding bicycle spare part. BACKGROUND

[0002] The head tube of the existing folding bicycle is generally composed of a vertical tube and a front fork tube, the vertical tube is used for connecting a handlebar, and the front fork tube is used for connecting a wheel and a frame, the connection between the vertical tube and the front fork tube of the folding bicycle is connected in a hinged manner, so that the vertical tube and the front fork tube can be folded by mutual folding, and then the hinged connection is fixed by setting a locking screw on the inner side of the vertical tube and the front fork tube, when folding is needed, the hinged connection is released by moving the locking screw, this mode only realizes folding by shaft hinging and realizes support by the locking screw, the structure is single and not compact, so that the vertical tube and the front fork tube cannot be reliably and tightly connected, and the reliability is poor. SUMMARY

[0003] Therefore, the utility model provides a head tube folding mechanism and a bicycle, which solve the technical problem of unreliable head tube folding mechanism in the prior art.

[0004] To achieve one or part or all of the above purposes or other purposes, the utility model provides a head tube folding mechanism for connecting a vertical tube and a front fork tube, which comprises a first connecting piece, a second connecting piece, a torsion spring, a connecting shaft, a connecting buckle and an unlocking assembly.

[0005] The upper end of the first connecting piece is provided with a mounting table, and the lower end of the first connecting piece is used for connecting the front fork tube, and the first connecting piece is further provided with a hinge part for hinging with the second connecting piece.

[0006] The upper end of the second connecting piece is used for connecting the vertical tube, the second connecting piece is provided with a connecting cavity with an open lower end, and the connecting cavity is provided with a connecting plate corresponding to the mounting table, the second connecting piece has a support position where the open lower end of the connecting cavity is attached to the upper end wall of the first connecting piece and a folding position where the open lower end of the connecting cavity is away from the upper end wall of the first connecting piece.

[0007] One end of the connecting buckle is hinged to the mounting table through the connecting shaft, the other end of the connecting buckle is provided with a lock buckle for clamping the connecting plate, the torsion spring is sleeved on the connecting shaft, and the torsion spring is connected to the mounting table and the connecting buckle respectively, when the second connecting piece is in the support position, the lock buckle is in the connecting cavity and clamped with the connecting plate, and when the second connecting piece is in the folding position, the lock buckle is separated from the connecting cavity.

[0008] The unlocking assembly is installed on the side wall of the second connecting piece, the unlocking assembly is drivingly connected with the lock buckle, and the clamping of the lock buckle and the connecting plate can be released through the unlocking assembly.

[0009] Preferably, the mounting table comprises two bosses and a limiting piece, the other end of the connecting buckle is hinged between the two bosses through a connecting shaft; the limiting piece is arranged on the two bosses, one end of the torsion spring is hooked on the limiting piece, and the limiting piece limits the rotation angle of the connecting buckle by abutting against the side wall of the connecting buckle.

[0010] Preferably, the limiting piece comprises a mounting plate and a baffle, the two ends of the mounting plate are respectively fixed to the upper ends of the two bosses, and one end of the torsion spring is hooked on the mounting plate, and the baffle can abut against the side wall of the connecting buckle.

[0011] Preferably, the lower end of the lock buckle is a buckling wall clamped with the connecting plate, the upper end of the lock buckle is provided with an inclined guide wall, and the two ends of the guide wall are provided with rounded corners, when the second connecting piece is switched from the folding position to the supporting position, the lower end of the connecting plate close to the lower side wall of the lower end opening of the connecting cavity is forced to rotate away from the limiting piece by abutting against the guide wall.

[0012] Preferably, a reinforcing rib is arranged between the lower side wall of the connecting plate and the inner wall of the connecting cavity, the reinforcing rib can abut against the guide wall towards the side wall of the lower end opening of the connecting cavity, and the lock buckle is forced to rotate away from the limiting piece by abutting against the guide wall through the reinforcing rib.

[0013] Preferably, the other end of the connecting buckle is provided with two connecting ears, the connecting shaft is hinged through the two connecting ears and the two bosses, the torsion spring is between the two connecting ears, and the other end of the torsion spring is hooked on the side wall of the connecting buckle away from the baffle.

[0014] Preferably, the side wall of the second connecting piece is provided with a mounting hole communicating with the outside and the connecting cavity, the unlocking assembly comprises a button, a return spring and an unlocking rod.

[0015] The button is slidably mounted on the mounting hole, and the inner side of the button is provided with a connecting rod, the return spring is sleeved on the connecting rod, one end of the unlocking bolt extends into the mounting hole and is coaxially fixed with the connecting rod, the other end of the unlocking rod can abut against the lock buckle, and the lock buckle is pushed away from the connecting plate by pressing the button to push the unlocking rod to move.

[0016] Preferably, the mounting table and the hinge part are arranged at intervals at the upper end of the first connecting piece.

[0017] Preferably, the rotation direction of the connecting buckle is the same as the rotation direction of the second connecting piece.

[0018] A bicycle comprising the above head tube folding mechanism, a stem and a front fork tube, the stem is connected with the upper end of the second connecting piece; the front fork tube comprises a front fork part for connecting a wheel and a frame connecting part for connecting a frame body, and the vertical plane where the frame connecting part is located and the vertical plane where the rotation direction of the second connecting piece is located have an included angle α.

[0019] The embodiment of the utility model is implemented, will have the following beneficial effect:

[0020] After adopting the above head tube folding mechanism, the reversible and resettable connecting buckle is arranged on the first connecting piece, and the connecting plate is arranged in the connecting cavity of the second connecting piece, so that when the second connecting piece is in the supporting position, the lock buckle of the connecting buckle is placed in the connecting cavity and is clamped with the connecting plate to realize the stability and firmness when the second connecting piece is docked with the first connecting piece, and then the connection reliability of the stand pipe and the front fork pipe of the folding bicycle is improved; the unlocking assembly for releasing the clamping relationship between the lock buckle and the connecting plate is arranged on the second connecting piece, so that the user can quickly release the clamping relationship and quickly fold the stand pipe installed on the second connecting piece. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creating labor.

[0022] Among them:

[0023] Figure 1 It is the whole structure schematic diagram of the head tube folding mechanism in the utility model Figure 1 ;

[0024] Figure 2 It is the whole structure explosion view of the head tube folding mechanism in the utility model;

[0025] Figure 3 It is the whole structure plan view of the head tube folding mechanism in the utility model;

[0026] Figure 4 It is the partial sectional view of the whole structure of the head tube folding mechanism in the utility model;

[0027] Figure 5 It is the enlarged view of A part in Figure 2 ;

[0028] Figure 6 It is the structure schematic diagram of the connecting buckle and the first connecting piece in the utility model;

[0029] Figure 7 It is the structure schematic diagram of the second connecting piece in the utility model.

[0030] Reference signs:

[0031] 1 first connecting piece, 10 installation platform, 100 boss, 11 limiting piece, 110 mounting plate, 111 baffle, 12 hinged part,

[0032] 2 second connecting member, 20 connecting cavity, 21 connecting plate, 211 reinforcing rib, 22 mounting hole, 23 connecting protrusion,

[0033] 3 torsion spring, 4 connecting shaft,

[0034] 5 connecting buckle, 50 lock buckle, 500 buckling wall, 501 guide wall, 51 connecting lug,

[0035] 6 unlocking assembly, 60 button, 61 reset spring, 62 unlocking rod,

[0036] 7 riser pipe, 8 front fork pipe, 80 front fork, 81 frame connecting part. DETAILED DESCRIPTION

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application; the description herein and the claims of the application and the above description of the drawings herein is not intended to be complete descriptions of all features of the application; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. Numerous embodiments of the application will be described with reference to the drawings, and then described in more detail below.

[0038] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase that in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that the embodiments described herein are merely examples from a multitude of embodiments that are in substantial compliance with the principles of the application.

[0039] In order to make the technical personnel in the technical field better understand the application scheme, the technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings.

[0040] As shown in the accompanying Figures 1-7 The embodiments provided by the application are shown in the accompanying drawings.

[0041] The utility model discloses a head tube folding mechanism for connecting vertical pipe 7 and front fork pipe 8, which comprises a first connecting piece 1, a second connecting piece 2, a torsion spring 3, a connecting shaft 4, a connecting buckle 5 and an unlocking assembly 6. The upper end of the first connecting piece 1 is provided with a mounting table 10, and the lower end of the first connecting piece 1 is used for connecting the front fork pipe 8. The first connecting piece 1 is further provided with a hinged part 12 hinged with the second connecting piece 2. The upper end of the second connecting piece 2 is used for connecting the vertical pipe 7, and the second connecting piece 2 is provided with a connecting cavity 20 with an open lower end. The connecting cavity 20 is provided with a connecting plate 21 corresponding to the mounting table 10. The second connecting piece 2 has a support position where the lower end opening of the connecting cavity 20 is attached to the upper end wall of the first connecting piece 1, and a folding position where the lower end opening of the connecting cavity 20 is away from the upper end wall of the first connecting piece 1. One end of the connecting buckle 5 is hinged to the mounting table 10 through the connecting shaft 4, and the other end of the connecting buckle 5 is provided with a lock catch 50 clamped with the connecting plate 21. The torsion spring 3 is sleeved on the connecting shaft 4, and the torsion spring 3 is connected to the mounting table 10 and the connecting buckle 5 respectively. When the second connecting piece 2 is in the support position, the lock catch 50 is placed in the connecting cavity 20 and clamped with the connecting plate 21. When the second connecting piece 2 is in the folding position, the lock catch 50 is separated from the connecting cavity 20. The unlocking assembly 6 is installed on the side wall of the second connecting piece 2, and the unlocking assembly 6 is drivingly connected with the lock catch 50. The clamping of the lock catch 50 and the connecting plate 21 can be released through the unlocking assembly 6.

[0042] Specifically, the first connecting piece 1 and the second connecting piece 2 are both cylindrical structures, so as to connect the vertical pipe 7 and the front fork pipe 8, and the unified shape is convenient for production, wherein the mounting table 10 and the hinged part 12 are arranged at the upper end of the first connecting piece 1 and spaced from each other, specifically, the upper end surface of the first connecting piece 1 is a concave structure, the mounting table 10 is arranged at one end of the concave structure, and the hinged part 12 is arranged outside the concave structure, and the concave structure and the connecting cavity 20 of the second connecting piece 2 are enclosed to form a cavity for the rotation of the connecting buckle 5, so as to miniaturize the first connecting piece 1 and the second connecting piece 2 and improve the overall compactness of the structure; the hinged part 12 of the embodiment is a protruding structure with a through hole, the lower end of the second connecting piece 2 is correspondingly provided with a connecting protrusion 23, the hinged part 12 and the connecting protrusion 23 are hinged by the locking bolt, so that the second connecting piece 2 can be in the folded position and the supporting position by turning over the second connecting piece 2, when the second connecting piece 2 is in the folded position, the outer wall of the vertical pipe 7 can be attached to the outer wall of the front fork pipe 8, so as to realize the folding operation of the head part of the bicycle; when the second connecting piece 2 is in the supporting position, the second connecting piece 2 is coaxially connected with the first connecting piece 1, and the upper end wall of the first connecting piece 1 covers the lower end opening of the connecting cavity 20, at this time, the upper half of the mounting table 10 is arranged in the connecting cavity 20, in order to make the second connecting piece 2 can be kept in the supporting position for a long time and stably, and ensure that the user can stably hold the head, the connecting buckle 5 and the torsion spring 3 for the tight buckle reset of the connecting buckle 5 are installed at the mounting table 10, specifically, the lower end of the lock buckle 50 forms a buckling wall 500, which is attached to the upper end wall of the connecting plate 21, and the connecting buckle 5 always has a rotating trend of buckling to the connecting plate 21 by the torsion spring 3, one or more torsion springs 3 can be arranged on the connecting shaft 4 to improve the tight buckle force of the connecting buckle 5, and then improve the fastening effect when the second connecting piece 2 is in the supporting position. In order to facilitate the user to release the limiting of the connecting buckle 5 to the second connecting piece 2 and realize the folding and turning over of the second connecting piece 2, the unlocking assembly 6 is arranged on the side wall of the second connecting piece 2, and the lock buckle 50 is abutted or pulled by the unlocking assembly 6, so that one end of the lock buckle 50 of the connecting buckle 5 rotates away from the connecting plate 21, and when the lock buckle 50 is completely separated from the connecting plate 21, the second connecting piece 2 can be turned over and folded.

[0043] In summary, the embodiment sets the reversible and resettable connecting buckle 5 on the first connecting piece 1, sets the connecting plate 21 in the connecting cavity 20 of the second connecting piece 2, so that when the second connecting piece 2 is in the supporting position, the locking buckle 50 of the connecting buckle 5 is placed in the connecting cavity 20 and is clamped with the connecting plate 21 to realize the stability and firmness when the second connecting piece 2 is connected with the first connecting piece 1, and then the connection reliability of the stand pipe 7 and the front fork pipe 8 of the folding bicycle is improved; and the unlocking assembly 6 for releasing the clamping relationship between the locking buckle 50 and the connecting plate 21 is correspondingly arranged on the second connecting piece 2, so that the user can quickly release the clamping relationship and quickly fold the stand pipe 7 installed on the second connecting piece 2.

[0044] It also needs to be explained that the rotating direction of the connecting buckle 5 is the same as the rotating direction of the second connecting piece 2, the folding and unlocking directions are set to be the same, the relative symmetry of the two rotating centers is realized, the internal structure is more compact and reasonable, and then the structural stability and firmness of the head tube folding mechanism are improved; the second connecting piece 2 can be integrally formed at the end of the stand pipe 7, or can be formed by independent processing and then fixed at the end of the stand pipe 7 by welding or other methods.

[0045] Referring to the accompanying drawings Figure 5 and the accompanying drawings Figure 6 , the mounting table 10 includes two convex platforms 100 and a limiting piece 11, the other end of the connecting buckle 5 is hinged between the two convex platforms 100 through the connecting shaft 4; the limiting piece 11 is arranged on the two convex platforms 100, one end of the torsion spring 3 is hooked on the limiting piece 11, the limiting piece 11 limits the rotating angle of the connecting buckle 5 by abutting against the side wall of the connecting buckle 5, specifically, the other end of the connecting buckle 5 is provided with two connecting ears 51, the two connecting ears 51 and the two convex platforms 100 are provided with through holes, and the maximum distance between the two connecting ears 51 is less than or equal to the minimum distance between the two convex platforms 100, in the embodiment, a gap is arranged between the two to facilitate the rotation of the connecting buckle 5 and improve the compactness and stability of the structure; during installation, the torsion spring 3 is arranged between the two connecting ears 51, the connecting shaft 4 penetrates the two convex platforms 100, the two connecting ears 51 and the torsion spring 3 to realize the hinge connection between the connecting buckle 5 and the mounting table 10, and then one end of the torsion spring 3 is hooked on the limiting piece 11 and the other end of the torsion spring 3 is hooked on the side wall of the connecting buckle 5 away from the limiting piece 11, in normal state, the torsion spring 3 always forces the side wall of the connecting buckle 5 to abut against the limiting piece 11, in other words, when the second connecting piece 2 is in the supporting position, the locking buckle 50 of the connecting buckle 5 is always buckled on the connecting plate 21 without the action of the unlocking assembly 6, and has good connection stability; and since the locking buckle 50 and the connecting plate 21 are both arranged in the connecting cavity 20, external other forces cannot interfere with the locking buckle 50 and the torsion spring 3, and the situation that the second connecting piece 2 cannot be in the supporting position due to accidents during cycling is avoided.

[0046] In order to further improve the connection stability between the mounting table 10 and the connecting buckle 5, and avoid the connecting buckle 5 from being turned over too much under the action of the torsion spring 3, the limiting piece 11 comprises a mounting plate 110 and a baffle 111. The two ends of the mounting plate 110 are respectively attached and fixed on the upper ends of the two bosses 100, and one end of the torsion spring 3 is hooked on the mounting plate 110. The baffle 111 can abut against the side wall of the connecting buckle 5. Specifically, the mounting plate 110 and the baffle 111 of the embodiment are perpendicular to each other and are integrally formed. The two ends of the mounting plate 110 are provided with through holes connected with the bosses 100. The mounting plate 110 can be fixed on the two bosses 100 by means of fastening bolts. The upper plate surface of the mounting plate 110 provides a hooking basis for one end of the torsion spring 3. Since the mounting plate 110 is above the connecting shaft 4, when the connecting buckle 5 is turned away from the connecting plate 21, the torsion spring 3 can be twisted and stored energy. The plate surface of the baffle 111 is used to abut against the side wall of the connecting buckle 5. When the second connecting piece 2 is in the supporting position, the distance between the plate surface of the baffle 111 and the axis of the connecting cavity 20 is less than or equal to the distance between the side wall of the connecting plate 21 and the axis of the connecting cavity 20. When the second connecting piece 2 is in the folded position, the connecting buckle 5 is limited by the baffle 111, and the connecting buckle 5 cannot be turned in the direction of the outer wall of the first connecting piece 1. It is ensured that when the second connecting piece 2 is turned from the folded position to the supporting position, the lower end wall of the connecting plate 21 can abut against the upper end wall of the lock catch 50 of the connecting buckle 5. The abutment of the lower end wall of the connecting plate 21 and the lock catch 50 forces the connecting buckle 5 to rotate away from the baffle 111. When the upper end of the first connecting piece 1 completely covers the lower end opening of the connecting cavity 20, the clamping wall 500 of the lock catch 50 and the upper end wall of the connecting plate 21 are clamped and connected with each other.

[0047] Referring to the drawings Figure 6 and the drawings Figure 7 The upper end of the lock catch 50 is provided with an inclined guide wall 501, and the two ends of the guide wall 501 are rounded. The lower side wall of the connecting plate 21 and the inner wall of the connecting cavity 20 are provided with a reinforcing rib 211. The side wall of the reinforcing rib 211 facing the lower end opening of the connecting cavity 20 can abut against the guide wall 501. When the second connecting piece 2 is switched from the folded position to the supporting position, the abutment of the reinforcing rib 211 and the guide wall 501 can force the lock catch 50 to rotate away from the limiting piece 11. Specifically, the reinforcing rib 211 can not only strengthen the strength of the connecting plate 21, but also ensure that the connecting plate 21 is not easy to deform and break under repeated pressing and clamping of the lock catch 50. The abutment and abutment of the reinforcing rib 211 and the guide wall 501 can quickly abut and tighten the upper end wall of the connecting plate 21 and the clamping wall 500 of the lock catch 50. It should be noted that the two ends of the reinforcing rib 211 are seamlessly connected with the end of the connecting plate 21 and the opening end of the connecting cavity 20, and are rounded. This improves the smoothness when the second connecting piece 2 is turned from the folded position to the supporting position.

[0048] In order to facilitate the user to release the clamping relationship between the lock catch 50 and the connecting plate 21, the utility model also has an unlocking assembly 6, which can adopt bolt ejection, bolt pulling and the like, and specifically, a threaded hole can be arranged on the outer wall of the second connecting piece 2, the lock catch 50 is separated from the connecting plate 21 by rotating the bolt, or a threaded hole is arranged on the outer wall of the second connecting piece 2 in other directions, a rope is arranged between the bolt and the lock catch 50, the lock catch 50 is pulled away from the connecting plate 21 by rotating the bolt, and then the clamping of the lock catch 50 on the connecting plate 21 is released. In order to enable the user to release the clamping of the lock catch 50 on the connecting plate 21 more conveniently and quickly, the embodiment provides the unlocking assembly 6 shown in the accompanying drawings to drive the lock catch 50. Figure 4 and the accompanying drawings Figure 5 The unlocking assembly 6 shown in the accompanying drawings drives the lock catch 50:

[0049] The side wall of the second connecting piece 2 is provided with a mounting hole 22 connected to the outside and the connecting cavity 20, the unlocking assembly 6 comprises a button 60, a reset spring 61 and an unlocking rod 62; the button 60 is slidably mounted on the mounting hole 22, the inner side of the button 60 is provided with a connecting rod, the reset spring 61 is sleeved on the connecting rod, one end of the unlocking bolt extends into the mounting hole 22 and is coaxially fixed with the connecting rod, the other end of the unlocking rod 62 can abut against the lock catch 50, and the lock catch 50 is pushed away from the connecting plate 21 by pressing the button 60 to push the unlocking rod 62 to move. Specifically, the hole diameter of the mounting hole 22 is slightly larger than the outer diameter of the button 60, so that when the button 60 is axially displaced in the mounting hole 22, the bottom wall of the mounting hole 22 is provided with a through hole smaller than the hole diameter, the button 60 adopts a T-shaped structure, the connecting rod can not only install the reset spring 61, but also facilitate the connection of the unlocking rod 62, the unlocking rod 62 adopts a T-shaped bolt, one end of the T-shaped bolt passes through the bottom wall through hole of the mounting hole 22 and is threadedly fixedly connected with the connecting rod, the other end of the T-shaped bolt abuts against the lock catch 50, and the T-shaped bolt can also limit the button 60 and the reset spring 61 in the mounting hole 22, so as to avoid the disengagement of the button 60 from the mounting hole 22; in the embodiment, the axial movement distance of the button 60 in the mounting hole 22 is greater than the width of the connecting plate 21, so as to ensure that the unlocking rod 62 can completely separate the lock catch 50 from the connecting plate 21. It should be noted that the reset spring 61 of the embodiment adopts a conical spiral spring, the conical spiral spring can effectively limit the length or space, and through the folding capacity of the conical spiral spring, it can store more energy in a smaller occupied space than a cylindrical spring, thereby reducing the occupied space of the unlocking assembly 6 and improving the compactness of the head tube folding mechanism.

[0050] Refer to the accompanying drawings Figure 1 - the accompanying drawings Figure 3The embodiment also provides a bicycle comprising the head tube folding mechanism, the stand tube 7 and the front fork tube 8, the stand tube 7 being connected with the upper end of the second connecting piece 2, the front fork tube 8 comprising a front fork part 80 for connecting a wheel and a frame connecting part 81 for connecting a frame body, a vertical plane where the frame connecting part 81 is located and a vertical plane where the rotating direction of the second connecting piece 2 are at an angle α, in the embodiment, the angle α is equal to 45°, through the angle α, the handlebar installed on the stand tube 7 can be attached to the wheel of the front fork part 80, so that the handlebar is attached to the wheel after the bicycle is folded, and the occupied space of the bicycle after being folded is reduced.

[0051] Obviously, the above-described embodiments are only some embodiments of the present application, not all the embodiments, the preferred embodiments of the present application are given in the drawings, but do not limit the patent scope of the present application. The present application can be realized in many different forms, and conversely, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing specific embodiments, or equivalently replace some technical features. Any equivalent structure made by using the content of the present application specification and drawings, directly or indirectly used in other related technical fields, is also within the patent protection scope of the present application.

Claims

1. A head tube folding mechanism for connecting a stand tube and a front fork tube, characterized by, The head tube folding mechanism comprises a first connecting piece, a second connecting piece, a torsion spring, a connecting shaft, a connecting buckle and an unlocking assembly; The upper end of the first connecting piece is provided with a mounting table, and the lower end of the first connecting piece is used for connecting a front fork tube; the first connecting piece is further provided with a hinged part hinged with the second connecting piece; The upper end of the second connecting piece is used for connecting a vertical tube, and the second connecting piece is internally provided with a connecting cavity with an open lower end; the connecting cavity is internally provided with a connecting plate corresponding to the mounting table; the second connecting piece has a support position where the open lower end of the connecting cavity is attached to the upper end wall of the first connecting piece and a folding position where the open lower end of the connecting cavity is away from the upper end wall of the first connecting piece; One end of the connecting buckle is hinged with the mounting table through the connecting shaft, and the other end of the connecting buckle is provided with a lock buckle for clamping the connecting plate; the torsion spring is sleeved on the connecting shaft, and the torsion spring is connected with the mounting table and the connecting buckle respectively; when the second connecting piece is in the support position, the lock buckle is placed in the connecting cavity and clamped with the connecting plate; when the second connecting piece is in the folding position, the lock buckle is separated from the connecting cavity. The unlocking assembly is installed on the side wall of the second connecting piece, and the unlocking assembly is drivingly connected with the lock buckle; the clamping of the lock buckle and the connecting plate can be released through the unlocking assembly.

2. The head tube folding mechanism of claim 1, wherein The mounting table comprises two convex tables and a limiting piece, and the other end of the connecting buckle is hinged between the two convex tables through the connecting shaft; the limiting piece is arranged on the two convex tables, one end of the torsion spring is hooked on the limiting piece, and the limiting piece limits the rotation angle of the connecting buckle by abutting against the side wall of the connecting buckle.

3. The head tube folding mechanism of claim 2, wherein The limiting piece comprises a mounting plate and a baffle; the two ends of the mounting plate are respectively attached to the upper ends of the two convex tables, and one end of the torsion spring is hooked on the mounting plate; the baffle can abut against the side wall of the connecting buckle.

4. The head tube folding mechanism of claim 2, wherein The lower end of the lock buckle is a clamping wall for clamping the connecting plate, and the upper end of the lock buckle is provided with an inclined guide wall; the two ends of the guide wall are rounded; when the second connecting piece is switched from the folding position to the support position, the lower side wall of the connecting plate close to the open lower end of the connecting cavity is forced to rotate away from the limiting piece by abutting against the guide wall.

5. The head tube folding mechanism of claim 4, wherein A reinforcing rib is arranged between the lower side wall of the connecting plate and the inner wall of the connecting cavity; the reinforcing rib can abut against the guide wall towards the side wall of the open lower end of the connecting cavity; the reinforcing rib and the guide wall can force the lock buckle to rotate away from the limiting piece.

6. The head tube folding mechanism of claim 3, wherein The other end of the connecting buckle is provided with two connecting ears; the connecting shaft is hinged with the two convex tables by penetrating the two connecting ears; the torsion spring is between the two connecting ears, and the other end of the torsion spring is hooked on the side wall of the connecting buckle away from the baffle.

7. The head tube folding mechanism of claim 2, wherein The side wall of the second connecting piece is provided with a mounting hole connected with the outside and the connecting cavity; the unlocking assembly comprises a button, a return spring and an unlocking rod; The button is slidably installed on the mounting hole, and the inner side of the button is provided with a connecting rod; the return spring is sleeved on the connecting rod; one end of the unlocking rod is inserted into the mounting hole and fixed coaxially with the connecting rod; the other end of the unlocking rod can abut against the lock buckle; the lock buckle can be pushed away from the connecting plate by pressing the button to push the unlocking rod to move.

8. The head tube folding mechanism of claim 2, wherein The mounting table and the hinged part are arranged at intervals on the upper end of the first connecting piece.

9. The head tube folding mechanism of claim 8, wherein The rotation direction of the connecting buckle is the same as the rotation direction of the second connecting piece.

10. A bicycle comprising a head tube folding mechanism according to any one of claims 1-9, characterized in that The vertical pipe is connected with the upper end of the second connecting piece, and the front fork pipe includes a front fork part for connecting a wheel and a frame connecting part for connecting a frame body, and a vertical plane where the frame connecting part is located and a vertical plane where the rotating direction of the second connecting piece are at an angle α.

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