Hidden self-locking folding structure and folding bicycle

Abstract

The utility model discloses a hidden self-locking folding structure and a folding bicycle, the self-locking folding structure comprises a first folding piece, a second folding piece, an automatic occlusion lock catch and a safety lock assembly, the first folding piece is hinged to the first end of the second folding piece, the second folding piece is provided with an installation groove, and the safety lock assembly is provided with an automatic occlusion lock catch. The safety lock assembly comprises a tension adjusting handle and a handle lock, and the automatic meshing lock catch and the tension adjusting handle are rotationally arranged in the mounting groove; when the tension adjusting handle is locked through the handle lock, the tension adjusting handle is contained in the mounting groove, and the tension adjusting handle provides locking tensile force for the automatic meshing lock catch which is in a meshing state with the first folding piece. According to the utility model, through the matching of the tension adjusting handle, the mounting groove and the automatic occlusion lock catch, the automatic occlusion lock catch cannot be accidentally opened when the tension adjusting handle is locked, and the problem that the tension adjusting handle and the automatic occlusion lock catch obviously protrude outwards is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical structure technical field especially relates to a hidden self-locking folding structure and folding bicycle. BACKGROUND

[0002] The bicycle frame folder on the market basically all have a lock handle suspended on the outer surface of the frame or obviously protruding from the frame, and the legs of the rider are easily scratched or the trouser legs are hung on the lock handle during riding, which affects the safety of the rider and causes hidden troubles of damaging the property of the user. SUMMARY

[0003] The utility model aims at overcoming the defects of the prior art and provides a hidden self-locking folding structure and a folding bicycle.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] On the one hand, the utility model provides a hidden self-locking folding structure, which comprises a first folding piece, a second folding piece, an automatic snap lock and a safety lock assembly, the first folding piece and the second folding piece both have a first end and a second end arranged oppositely, the first end of the first folding piece and the first end of the second folding piece are hingedly arranged, the second folding piece is provided with a mounting groove, the safety lock assembly comprises a tension adjusting handle and a handle lock, the automatic snap lock and the tension adjusting handle are both rotationally arranged in the mounting groove; when the tension adjusting handle is locked by the handle lock, the tension adjusting handle is accommodated in the mounting groove, and the tension adjusting handle provides a locking tension for the automatic snap lock in the engaged state with the first folding piece.

[0006] Further, the handle lock comprises a latch and a latch elastic piece, the side surface of the tension adjusting handle is provided with a lock hole, the latch is elastically connected with the latch elastic piece, and when the latch is clamped in the lock hole, the tension adjusting handle is locked.

[0007] Further, the bottom of the mounting groove is provided with a latch movable cavity, the latch has at least a movable space in the latch movable cavity in the width direction of the mounting groove, one side of the second folding piece in the width direction is provided with a pressing hole, one end of the latch is located in the pressing hole, the latch is provided with a hook-shaped part matched with the lock hole, and when the tension adjusting handle is locked, the hook-shaped part keeps the state of being matched with the lock hole under the elastic force of the latch elastic piece, the hook-shaped part is separated from the lock hole by pressing the part of the latch in the pressing hole, so that the state of the tension adjusting handle being locked is released.

[0008] Further, the safety lock assembly further comprises a push rod and a push rod elastic element, the push rod is arranged along the height direction of the mounting slot, the push rod elastic element is elastically connected with the push rod, and the tension adjusting handle is locked when the push rod elastically abuts against the tension adjusting handle.

[0009] Further, the hinge hole is arranged obliquely, and the hinge shaft is arranged in the hinge hole.

[0010] Further, the butt joint limiting structure comprises a butt joint limiting groove and a butt joint limiting protrusion, one of the first end of the first folding piece and the first end of the second folding piece is provided with the butt joint limiting groove, and the other is provided with the butt joint limiting protrusion, the butt joint limiting protrusion is located in the butt joint limiting groove when the first folding piece and the second folding piece are in the butt joint state, and the damping element is arranged in the butt joint limiting groove.

[0011] Further, the mounting slot is provided with a connecting shaft and a shaft sleeve, the connecting shaft is arranged along the width direction of the mounting slot, the shaft sleeve is provided with an eccentric sleeve hole, the shaft sleeve is movably sleeved on the connecting shaft through the eccentric sleeve hole, the automatic snap lock is connected with the shaft sleeve and can rotate relative to the shaft sleeve, and the tension adjusting handle is connected with the shaft sleeve and can drive the shaft sleeve to rotate synchronously relative to the connecting shaft.

[0012] Further, the automatic snap lock comprises a snap end and a pressing end, a rotating connection hole is arranged between the snap end and the pressing end, the automatic snap lock is movably sleeved on the shaft sleeve through the rotating connection hole, the snap end is provided with a snap jaw, the first folding piece is provided with a matching jaw matched with the snap jaw, a self-locking elastic element is arranged between the pressing end and the mounting slot, and the self-locking elastic element provides a self-locking snap force to the automatic snap lock when the snap jaw is snapped with the matching jaw.

[0013] Further, the tension adjusting handle comprises oppositely arranged first and second rotating connection arms and a pulling part, one end of the first rotating connection arm and one end of the second rotating connection arm are connected with the pulling part, the other end of the first rotating connection arm and the other end of the second rotating connection arm are provided with polygonal connection holes, both ends of the shaft sleeve are provided with polygonal connection parts matched with the polygonal connection holes, the pressing end is located between the first rotating connection arm and the second rotating connection arm when the tension adjusting handle is locked, and the upper surface of the pressing end and the upper surface of the pulling part are flush with the slot opening of the mounting slot.

[0014] In another aspect, the utility model provides a folding bicycle still, including folding frame and located on the folding frame like above-mentioned one hidden type self -locking folding structure, the folding frame includes first folding pipe and second folding pipe, one hidden type self -locking folding structure is located between first folding pipe and second folding pipe, the second end of first folding piece is connected with first folding pipe, the second end of second folding piece is connected with second folding pipe.

[0015] The utility model discloses compared with prior art has the advantage is: one hidden type self -locking folding structure, including first folding piece, second folding piece, automatic snap lock and safety lock subassembly, first folding piece and second folding piece all have the first end and the second end of relative arrangement, the first end of first folding piece and the first end of second folding piece articulate to set, and second folding piece is equipped with the installation groove, and safety lock subassembly includes tension adjusting handle and handle lock, and automatic snap lock and tension adjusting handle all rotate setting in installation groove, when tension adjusting handle locks through handle lock, tension adjusting handle is received in installation groove, and tension adjusting handle is automatic snap lock with first folding piece in the snap state and provides the locking tension of automatic snap lock.

[0016] The above description is only a summary of the technical scheme of the utility model, in order to can more clearly understand the technical means of the utility model, can be implemented according to the content of specification, and in order to let the above and other purpose characteristics and advantages of the utility model can be more obvious and easy to understand, the following preferred embodiments are described in detail as follows. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be briefly introduced to the drawing needed to be used in the embodiment description, obviously, the drawing in the following description is some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, still can obtain other drawings according to these drawings.

[0018] Figure 1 The structure diagram (snap state) of one hidden type self -locking folding structure provided for the specific embodiment of the utility model is shown in the following figure:

[0019] Figure 2 The structure diagram (not snap state) of one hidden type self -locking folding structure provided for the specific embodiment of the utility model is shown in the following figure:

[0020] Figure 3A structure schematic view of the second folding piece in the hidden self-locking folding structure is provided for the embodiment of the utility model.

[0021] Figure 4 An exploded view of the second folding piece in the hidden self-locking folding structure is provided for the embodiment of the utility model. Figure 1 ;

[0022] Figure 5 An exploded view of the second folding piece in the hidden self-locking folding structure is provided for the embodiment of the utility model. Figure 2 ;

[0023] Figure 6 A partial structure schematic view of the second folding piece in the hidden self-locking folding structure is provided for the embodiment of the utility model.

[0024] Figure 7 An exploded view of the partial structure of the second folding piece in the hidden self-locking folding structure is provided for the embodiment of the utility model.

[0025] Figure 8 A structure schematic view of the first folding piece in the hidden self-locking folding structure is provided for the embodiment of the utility model.

[0026] Reference signs

[0027] 1, first folding piece; 11, cooperation socket; 12, butt joint limiting groove; 121, damping piece; 2, second folding piece; 21, installation groove; 211, clamping tongue movable cavity; 22, butt joint limiting protrusion; 23, pressing hole; 24, hinged hole; 241, hinged shaft; 3, automatic occlusion lock; 31, occlusion end; 311, occlusion socket; 32, pressing end; 33, rotary connection hole; 4, tension adjusting handle; 41, first rotary connection arm; 42, second rotary connection arm; 43, pulling part; 431, lock hole; 44, polygonal connection hole; 5, handle lock; 51, clamping tongue; 511, hook-shaped part; 52, clamping tongue elastic piece; 6, connecting shaft; 61, shaft sleeve; 611, eccentric sleeve hole; 612, polygonal connection part; 7, self-locking elastic piece; 8, push rod; 9, push rod elastic piece. DETAILED DESCRIPTION

[0028] The technical scheme of the utility model will be described clearly and completely in combination with the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, instead of all the embodiment. Based on the embodiment in the utility model, all the other embodiment obtained by the person skilled in the art without making the creative labor belongs to the protection scope of the utility model.

[0029] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0030] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0031] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the communication or interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0032] In the utility model, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0033] It is to be understood that when an element such as a layer, region or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements can be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. It will be understood that, when a member is referred to as being "coupled" or "connected" to another member, it can be directly coupled or connected to the other member or intervening members can be present. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0034] As shown in Figures 1 to 8 The utility model discloses a hidden self-locking folding structure, including first folding piece 1, second folding piece 2, automatic snap lock 3 and safety lock assembly, first folding piece 1 and second folding piece 2 are tubular or rod structure, first folding piece 1 and second folding piece 2 all have the first end and the second end of relative arrangement, the first end of first folding piece 1 and the first end of second folding piece 2 are hingedly arranged, through the design of hinging, make two folding pieces (first folding piece 1 and second folding piece 2) can rotate around the hinge point relatively, to realize the action of folding and unfolding. Second folding piece 2 is equipped with installation groove 21, and safety lock assembly includes tension adjusting handle 4 and handle lock 5, and automatic snap lock 3 and tension adjusting handle 4 are rotationally arranged in installation groove 21, when tension adjusting handle 4 is locked by handle lock 5, tension adjusting handle 4 is housed in installation groove 21, and tension adjusting handle 4 provides the locking tension of automatic snap lock 3 in the occlusion state with first folding piece 1.

[0035] Installation groove 21 is the important area of housing and installing key components in the whole structure. It provides installation space for automatic snap lock 3 and tension adjusting handle 4, and plays a protective and hidden role while ensuring that these components can rotate normally.

[0036] Tension adjusting handle 4 is one of the core components in safety lock assembly, which is rotationally arranged in installation groove 21. When the folding structure needs to be locked, tension adjusting handle 4 is locked by handle lock 5, at this time, it is housed in installation groove 21 and does not protrude to affect the overall appearance, and can provide the required tension for locking automatic snap lock 3 in the occlusion state with first folding piece 1.

[0037] By setting the cooperation structure of tension adjusting handle 4 and automatic snap lock 3, and the locking function of handle lock 5, the accidental folding of the folding structure during use can be effectively prevented, and the safety of the user is ensured. Since tension adjusting handle 4 and automatic snap lock 3 can be housed in installation groove 21 in the locked state, the problem of obvious protrusion of the components is avoided.

[0038] In one embodiment, the handle lock 5 includes a latch 51 and a latch elastic member 52. The side of the tension adjusting handle 4 is provided with a lock hole 431. The latch 51 and the latch elastic member 52 are elastically connected. When the latch 51 is locked in the lock hole 431, the tension adjusting handle 4 is locked.

[0039] like Figures 6 to 7 As shown, the latch 51 is a key component for achieving the locking function. It is connected to the latch elastic element 52, and the extension, retraction, and reset of the latch 51 are achieved through the elastic force of the elastic element. Specifically, the latch elastic element 52 can be made of materials with good elastic properties, such as coil springs or leaf springs, to provide elastic force for the latch 51. A locking hole 431 is provided on the side of the tension adjusting handle 4. The position and size of the locking hole 431 should match the shape and size of the latch 51 to ensure that the latch 51 can be smoothly inserted and firmly fixed in the locking hole 431. The locking hole 431 can be round, square, or other suitable shapes. Its size should ensure that the latch 51 will not easily wobble after insertion, while also taking into account the wear and deformation of the latch 51 during long-term use, and allowing for a certain tolerance range.

[0040] In one embodiment, such as Figures 6 to 7 As shown, the bottom of the mounting groove 21 is provided with a latch movable cavity 211. The latch 51 has at least a movable space in the latch movable cavity 211 that moves along the width direction of the mounting groove 21. A pressing hole 23 is provided on one side of the second folding member 2 in the width direction. One end of the latch 51 is located in the pressing hole 23. The latch 51 is provided with a hook-shaped part 511 that engages with the locking hole 431. When the tension adjusting handle 4 is locked, the hook-shaped part 511 remains engaged with the locking hole 431 under the elastic force of the latch elastic member 52. By pressing the latch 51 at the pressing hole 23, the hook-shaped part 511 is disengaged from the locking hole 431, thereby releasing the state of the tension adjusting handle 4 being locked.

[0041] The length of the movable cavity must ensure that the latch 51 has sufficient room to move in that direction, so that the hook-shaped part 511 of the latch 51 can smoothly engage and disengage with the lock hole 431. This length can be determined based on the length of the latch 51, the length of the hook-shaped part 511, and the amount of displacement required for operation. The width of the movable cavity should match the width of the latch 51 to prevent the latch 51 from swaying or shaking in the width direction of the movable cavity, thereby improving the smoothness of movement.

[0042] The depth of the pressing hole 23 should ensure that one end of the latch 51 can be stably positioned therein, while not affecting the normal movement of the latch 51 within the latch movable cavity 211.

[0043] The hook-shaped part 511 of the clamping tongue 51 is an important structure for clamping with the lock hole 431. The shape and size of the hook-shaped part 511 need to be adapted to the lock hole 431, and the angle and curvature of the hook-shaped part 511 need to be ensured to firmly hook the lock hole 431 under the elastic force of the clamping tongue elastic member 52.

[0044] When the tension adjusting handle 4 is in the locked position, the hook-shaped part 511 is tightly clamped into the lock hole 431 under the elastic force of the clamping tongue elastic member 52, ensuring that the tension adjusting handle 4 will not be accidentally rotated due to external disturbances. At this time, the elastic force of the clamping tongue elastic member 52 needs to be just right, neither too large to cause unlocking difficulty, nor too small to make the locking not firm. By adjusting the elastic coefficient of the clamping tongue elastic member 52, the ideal locking effect can be achieved.

[0045] The unlocking operation is achieved by pressing the hole 23, providing an intuitive and simple operation method for the user, without the need for complex tools or steps. Only by pressing the part of the clamping tongue 51 located in the pressing hole 23, the locked state of the tension adjusting handle 4 can be released. At the same time, the design of the clamping tongue 51, the clamping tongue movable cavity 211 and the pressing hole 23 enables the entire locking structure to be integrated into the mounting groove 21, not only making the overall structure more compact, but also hiding the locking mechanism, avoiding damage or interference with the surrounding environment caused by exposed components. During normal use, since the hook-shaped part 511 can maintain the clamping state with the lock hole 431 under the elastic force of the clamping tongue elastic member 52, the locked state of the tension adjusting handle 4 is stable and reliable, preventing accidental unlocking during use.

[0046] In an embodiment, as shown in Figures 5 to 7 The safety lock assembly further includes a push rod 8 and a push rod elastic member 9. The push rod 8 is arranged along the height direction of the mounting groove 21, and the push rod elastic member 9 is elastically connected with the push rod 8. When the tension adjusting handle 4 is locked, the push rod 8 elastically abuts against the tension adjusting handle 4.

[0047] The push rod 8 can be a cylindrical or square rod structure, and its material can be selected from metal or engineering plastic with certain strength and wear resistance to ensure that it will not deform or be damaged during long-term use.

[0048] The push rod elastic member 9 is elastically connected with the push rod 8, and the push rod elastic member 9 can be a compression spring, a rubber elastic body, etc. In this embodiment, a compression spring is used, one end of which is connected with the push rod 8, and the other end is fixed in the mounting groove 21, providing elastic force by compression or expansion.

[0049] The installation position of the push rod 8 and the push rod elastic member 9 should ensure that the push rod 8 can be in elastic abutment with the tension adjusting handle 4 in the height direction. When installing, the axis of the push rod 8 should be perpendicular to the contact surface of the tension adjusting handle 4 to ensure the accurate transmission direction of the elastic force and avoid side force that affects the stability of the structure.

[0050] When the tension adjusting handle 4 is locked, the push rod 8 will be in elastic abutment with the tension adjusting handle 4 under the elastic force of the push rod elastic member 9. This elastic abutment has multiple effects. First, when the tension adjusting handle 4 is unlocked, the elastic force of the push rod 8 can directly push the tension adjusting handle 4 upwards, making it easier for the user to rotate the tension adjusting handle 4 with their fingers. Second, it can provide a certain amount of pre-tightening force to the tension adjusting handle 4, making it more stable in the locked state and preventing it from loosening due to slight vibrations or external disturbances. Third, when subjected to external impact, the elastic force of the push rod 8 can act as a buffer to protect the tension adjusting handle 4 and the entire locking structure.

[0051] In an embodiment, the hinge hole 24 is inclined, and the hinge hole 24 is provided with a hinge shaft 241. In actual application, the angle of the inclined hinge hole 24 can change the folding angle of the first folding piece 1 and the second folding piece 2. For example, when this structure is applied to a folding bicycle, the front and rear wheels of the folded bicycle can be in the same plane, making the folded bicycle smaller and more stable when placed on the ground.

[0052] In an embodiment, as shown in Figure 6 , Figure 8 The hidden self-locking folding structure also includes a docking limiting structure, which includes a docking limiting slot 12 and a docking limiting protrusion 22. One of the first end of the first folding piece 1 and the first end of the second folding piece 2 is provided with the docking limiting slot 12, and the other is provided with the docking limiting protrusion 22. When the first folding piece 1 and the second folding piece 2 are in the docking state, the docking limiting protrusion 22 is located in the docking limiting slot 12. The docking limiting slot 12 is provided with a damping member 121.

[0053] The docking limiting structure is composed of the docking limiting slot 12 and the docking limiting protrusion 22, which is an important component to ensure accurate alignment and stable connection of the first folding piece 1 and the second folding piece 2 in the docking state. Specifically, the docking limiting slot 12 and the docking limiting protrusion 22 can be rectangular, circular, trapezoidal or other shapes, and their design should ensure sufficient contact area between them to achieve stable limiting function.

[0054] The depth and width of the abutting limiting groove 12 are matched with the size of the abutting limiting protrusion 22, and generally the depth of the abutting limiting groove 12 is greater than the depth of the abutting limiting protrusion 22, so as to leave installation space for the damping member 121, and the damping member 121 can be installed by pasting, embedding or clamping in the abutting limiting groove 12.

[0055] The damping member 121 arranged in the abutting limiting groove 12 can be a gasket, a bushing or the like made of rubber, silica gel or other elastic materials, or can be an adjustable compression spring, and the main function of the damping member 121 is to absorb and buffer the energy generated by collision or vibration when the folding members are abutted, so as to reduce the impact on the structure. For example, when the first folding member 1 and the second folding member 2 are abutted, the abutting limiting protrusion 22 will enter the abutting limiting groove 12, and the damping member 121 will be extruded, and the elastic deformation of the damping member 121 can buffer the impact force generated in the abutting moment, so as to avoid damage of the components due to rigid collision.

[0056] In an embodiment, as shown in Figures 4 to 7 , the mounting groove 21 is provided with a connecting shaft 6 and a shaft sleeve 61, the connecting shaft 6 is arranged along the width direction of the mounting groove 21, the shaft sleeve 61 is provided with an eccentric sleeve hole 611, the shaft sleeve 61 is movably sleeved on the connecting shaft 6 through the eccentric sleeve hole 611, the automatic snap lock 3 is connected with the shaft sleeve 61 and can rotate relative to the shaft sleeve 61, and the tension adjusting handle 4 is connected with the shaft sleeve 61 and can drive the shaft sleeve 61 to rotate synchronously relative to the connecting shaft 6.

[0057] Specifically, the shaft sleeve 61 is installed on the connecting shaft 6 through the eccentric sleeve hole 611, so that the shaft sleeve 61 can rotate around the connecting shaft 6 while maintaining its eccentric characteristic, when the shaft sleeve 61 rotates, the relative position and angle of the automatic snap lock 3 relative to the connecting shaft 6 will be changed, and the tension adjusting handle 4 is connected to the shaft sleeve 61, so that the shaft sleeve 61 can be rotated on the connecting shaft 6 by applying external force or adjusting torque, so as to adjust the tension applied to the automatic snap lock 3, when the bottom of the automatic snap lock 3 is in contact with the mounting groove 21 by the action force applied by the tension adjusting handle 4, in this case, the automatic snap lock 3 is forced to be in a tense state, and only when the tension applied to the automatic snap lock 3 is removed, the automatic snap lock 3 can rotate relative to the shaft sleeve 61.

[0058] In an embodiment, as shown in Figure 3 , Figure 8As shown, the automatic snap lock 3 includes a snap end 31 and a pressing end 32, and a rotating connection hole 33 is arranged between the snap end 31 and the pressing end 32. The automatic snap lock 3 is movably sleeved on the shaft sleeve 61 through the rotating connection hole 33. The snap end 31 is provided with a snap jaw 311, and the first folding piece 1 is provided with a matching jaw 11 that is snap-fit with the snap jaw 311. A self-locking elastic piece 7 is arranged between the pressing end 32 and the mounting groove 21. When the snap jaw 311 is snap-fit with the matching jaw 11, the self-locking elastic piece 7 provides a self-locking snap force to the automatic snap lock 3.

[0059] Specifically, the snap end 31 is mainly responsible for snap-fitting with the matching jaw 11 on the first folding piece 1 to realize the locking function of the folding structure. The pressing end 32 mainly provides an operation interface for the user to control the unlocking action of the automatic snap lock 3 by pressing or other operations. The snap jaw 311 of the snap end 31 is an important part to realize the locking function. Its shape and size need to be matched with the matching jaw 11 on the first folding piece 1 to ensure that the two can be tightly snap-fitted.

[0060] The rotating connection hole 33 is a key structure for the automatic snap lock 3 to be movably sleeved on the shaft sleeve 61, so as to ensure that the automatic snap lock 3 can smoothly rotate on the shaft sleeve 61. The self-locking elastic piece 7 is arranged between the pressing end 32 and the mounting groove 21, and provides a self-locking snap force to the automatic snap lock 3. The self-locking elastic piece 7 can be a spring or elastic rubber, and its elastic coefficient needs to be selected according to the specific application scenario and the required snap force.

[0061] The installation of the self-locking elastic piece 7 needs to ensure that it can effectively apply an elastic force when the snap jaw 311 is snap-fitted with the matching jaw 11. In this embodiment, the mounting groove 21 is provided with a vertical spring groove, and the self-locking elastic piece 7 is installed in the spring groove.

[0062] The self-locking elastic piece 7 provides a self-locking snap force to the automatic snap lock 3, which ensures the firm snap-fitting between the snap jaw 311 and the matching jaw 11 and enhances the locking stability of the folding structure. After the tension applied to the automatic snap lock 3 is removed, the user only needs to press the pressing end 32 to release the locking state of the automatic snap lock 3, which is simple and intuitive and does not require complex tools or operation steps. For ordinary users, this operation method is very convenient and can easily complete the folding and unfolding operations.

[0063] In an embodiment, as shown in FIG. 6, the automatic snap lock 3 is provided with a rotating handle 4. The rotating handle 4 is arranged on the pressing end 32 of the automatic snap lock 3, and the rotating handle 4 is provided with a rotating handle hole 41. The rotating handle hole 41 is arranged to be rotatable with the rotating handle 4, and the rotating handle hole 41 is arranged to be rotatable with the rotating handle 4. Figure 1 、 Figure 5As shown, the tension adjusting handle 4 includes oppositely arranged first and second rotary connecting arms 41 and 42 and a pulling portion 43, one end of each of the first and second rotary connecting arms 41 and 42 is connected with the pulling portion 43, the other end of each of the first and second rotary connecting arms 41 and 42 is provided with a polygonal connecting hole 44, both ends of the shaft sleeve 61 are provided with polygonal connecting portions 612 connected with the polygonal connecting holes 44, when the tension adjusting handle 4 is locked, the pressing end 32 is between the first and second rotary connecting arms 41 and 42, and the upper surface of the pressing end 32 and the upper surface of the pulling portion 43 are flush with the slot of the mounting groove 21.

[0064] Specifically, both ends of the shaft sleeve 61 are provided with polygonal connecting portions 612 connected with the polygonal connecting holes 44, and such a polygonal connection mode can realize close connection and accurate torque transmission. When installing, the polygonal connecting portions 612 at both ends of the shaft sleeve 61 are accurately inserted into the polygonal connecting holes 44 of the first and second rotary connecting arms 41 and 42, and by using the shape characteristics of the polygon, synchronous rotation and stable connection are realized. In order to facilitate assembly, chamfers can be provided at the edges of the connecting portions and the connecting holes to facilitate insertion and positioning.

[0065] The upper surface of the pressing end 32 and the upper surface of the pulling portion 43 are flush with the slot of the mounting groove 21, which not only has an aesthetic appearance, but also can avoid collision danger or affect the overall appearance caused by protruding parts.

[0066] The working process of the hidden self-locking folding structure is as follows:

[0067] The unfolding process:

[0068] In the initial state, the folding structure is in the folded state, the first and second folding pieces 1 and 2 are close to each other, the engagement notch 311 of the automatic engagement lock 3 is in a separated state with the matching notch 11 of the first folding piece 1, and the tension adjusting handle 4 is in an unlocked state.

[0069] The first and second folding pieces 1 and 2 are unfolded outward, so that they rotate around the hinge shaft 241, at this time the abutting limiting structure begins to play a role. The abutting limiting protrusions 22 at the first ends of the first and second folding pieces 1 and 2 gradually approach the abutting limiting grooves 12, and finally the abutting limiting protrusions 22 accurately enter the abutting limiting grooves 12. Since the abutting limiting grooves 12 are provided with damping members 121, when the abutting limiting protrusions 22 enter the abutting limiting grooves 12, the damping members 121 are compressed to absorb the impact force in the abutting process, so that the abutting process is more stable, and the accuracy and stability of the two folding pieces at the abutting position are also ensured.

[0070] When the first folding piece 1 and the second folding piece 2 are unfolded to the predetermined position, the clamping socket 311 of the automatic clamping lock 3 is close to the matching socket 11 of the first folding piece 1. Because the pressing end 32 of the automatic clamping lock 3 is provided with the self-locking elastic member 7 between the mounting groove 21, the clamping socket 311 is automatically clamped with the matching socket 11 under the elastic force of the self-locking elastic member 7, forming a preliminary locking state.

[0071] Then, the user operates the tension adjusting handle 4. The tension adjusting handle 4 includes the oppositely arranged first rotating connecting arm 41, the second rotating connecting arm 42 and the pulling part 43. The user holds the pulling part 43 and rotates the tension adjusting handle 4. Because the tension adjusting handle 4 is connected with the shaft sleeve 61 through the polygonal connecting hole 44 and the polygonal connecting part 612 at both ends of the shaft sleeve 61, the tension adjusting handle 4 will drive the shaft sleeve 61 to rotate synchronously relative to the connecting shaft 6. The shaft sleeve 61 is movably sleeved on the connecting shaft 6 through the eccentric sleeve hole 611. The rotation of the shaft sleeve 61 will change the relative position and angle of the automatic clamping lock 3 relative to the connecting shaft 6, and will adjust the tension applied to the automatic clamping lock 3, further strengthening the locking effect of the automatic clamping lock 3, and ensuring that the folding structure is firmly kept in the unfolded state.

[0072] Finally, the tension adjusting handle 4 is rotated to the locking position. At this time, the tension adjusting handle 4 is locked by the handle lock 5. The handle lock 5 includes the clamping tongue 51 and the clamping tongue elastic member 52. The side surface of the tension adjusting handle 4 is provided with the lock hole 431. The clamping tongue 51 is elastically connected with the clamping tongue elastic member 52. The clamping tongue 51 is clamped in the lock hole 431, locking the tension adjusting handle 4. Moreover, the tension adjusting handle 4 is accommodated in the mounting groove 21. The pressing end 32 is between the first rotating connecting arm 41 and the second rotating connecting arm 42. The upper surface of the pressing end 32 and the upper surface of the pulling part 43 are flush with the slot of the mounting groove 21, forming a compact and beautiful appearance. At the same time, the push rod 8 and the push rod elastic member 9 in the safety lock assembly also play a role. The push rod 8 is arranged along the height direction of the mounting groove 21. The push rod elastic member 9 is elastically connected with the push rod 8. The push rod 8 will elastically abut against the tension adjusting handle 4, providing additional stability for the tension adjusting handle 4, preventing it from loosening due to external vibration or slight interference.

[0073] Folding process:

[0074] Firstly, the tension adjusting handle 4 needs to be unlocked. The user presses the clamping tongue 51 at the pressing hole 23. Because the clamping tongue 51 is provided with the hook-shaped part 511 matched with the lock hole 431, the elastic force of the clamping tongue elastic member 52 will keep the hook-shaped part 511 in the lock hole 431. Pressing the clamping tongue 51 will overcome the elastic force of the clamping tongue elastic member 52, making the hook-shaped part 511 separate from the lock hole 431, thereby releasing the locked state of the tension adjusting handle 4.

[0075] Then, the user pulls the pulling part 43 of the tension adjusting handle 4 to drive the shaft sleeve 61 to rotate reversely to release the tension force applied to the automatic snap lock 3. Then, the pressing end 32 of the automatic snap lock 3 is pressed to separate the snap-in notch 311 from the cooperating notch 11. With the separation of the snap-in notch 311 from the cooperating notch 11, the first folding part 1 and the second folding part 2 can rotate relative to each other around the hinge shaft 241 to realize the folding operation. During the folding process, the hinge shaft 241 in the hinge hole 24 can make the first folding part 1 and the second folding part 2 move along a specific inclined track due to the inclined arrangement of the hinge hole 24, so that the folding structure is more compact.

[0076] Finally, the folding structure is folded to the required position to complete the folding operation.

[0077] The utility model embodiment further provides a folding bicycle, including folding frame and set in folding frame like above-mentioned one kind of hidden type self locking folding structure, folding frame includes first folding pipe and second folding pipe, one kind of hidden type self locking folding structure is located between first folding pipe and second folding pipe, first folding part 1's second end is connected with first folding pipe, second folding part 2's second end is connected with second folding pipe.

[0078] In actual application, in order to guarantee the consistency of the hidden type self locking folding structure and the appearance of the folding bicycle, the first folding part 1 and the second folding part 2 are same as the first folding pipe and the second folding pipe of the folding bicycle in the appearance size and the material, and the second end of the first folding part 1 and the second end of the second folding part 2 are connected by nesting.

[0079] When the folding bicycle needs to be unfolded for normal riding, the first folding pipe and the second folding pipe are unfolded to make the first folding part 1 and the second folding part 2 return to the unfolded position, and the snap-in notch 311 of the automatic snap lock 3 and the cooperating notch 11 of the first folding part 1 can be automatically snapped under the action of the self locking elastic member 7. Then, the tension adjusting handle 4 is operated to rotate the adjusting shaft sleeve 61 to provide the locking tension force for the automatic snap lock 3, and the tension adjusting handle 4 is locked by the handle lock 5 to ensure that the bicycle frame is in a stable unfolded state and can be normally ridden. The whole unfolding process is simple and convenient, and the user can complete it in a short time, which is convenient for daily use and travel.

[0080] In order to facilitate the user to fold and unfold, the tension adjusting handle 4 is designed as a lever ratio of about 60 times, so that the strength required by the user during folding / unfolding can be obviously reduced, thereby better meeting the user's needs and improving the user experience.

[0081] It should be noted that the so-called 60 times or so lever ratio refers to the distance from the point of action of the force exerted by the user on the tension adjusting handle 4 to the rotating shaft as the power arm, and the distance from the point of action of the force received on the automatic snap lock 3 to the rotating shaft as the resistance arm. Then the lever ratio of 60 times means that the length of the power arm is about 60 times the length of the resistance arm.

[0082] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A concealed self-locking folding structure, characterized in that, The utility model provides a safety lock assembly, automatic snap lock and first folding piece, second folding piece, automatic snap lock and first folding piece and second folding piece all have opposite first end and second end, first end of first folding piece and first end of second folding piece are hinged arrangement, second folding piece is equipped with installation groove, safety lock assembly includes tension adjusting handle and handle lock, automatic snap lock and tension adjusting handle all rotation arrangement in installation groove, when tension adjusting handle is locked by handle lock, tension adjusting handle is received in installation groove, and tension adjusting handle is the automatic snap lock that is in snap state with first folding piece and provides locked tension for automatic snap lock.

2. A concealed self-locking folding structure according to claim 1, characterized in that, Handle lock includes latch and latch spring, the side of tension adjusting handle is equipped with lock hole, latch and latch spring are elastically connected, when latch is clamped in lock hole, tension adjusting handle is locked.

3. A concealed self-locking folding structure according to claim 2, characterized in that, The bottom of installation groove is equipped with latch movable cavity, and the latch has at least a moving space in the latch movable cavity along the width direction of the installation groove, one side of the second folding piece in the width direction is provided with a pressing hole, one end of the latch is located in the pressing hole, the latch is provided with a hook portion matched with the lock hole, when the tension adjusting handle is locked, the hook portion keeps the state of being matched with the lock hole under the elastic force of the latch spring, by pressing the part of the latch in the pressing hole, the hook portion is separated from the lock hole, so that the state of the tension adjusting handle being locked is released.

4. The hidden self-locking folding structure according to claim 1, wherein, The safety lock assembly further includes a push rod and a push rod spring, the push rod is arranged along the height direction of the installation groove, and the push rod spring is elastically connected with the push rod, when the tension adjusting handle is locked, the push rod elastically abuts against the tension adjusting handle.

5. The hidden self-locking folding structure according to claim 1, wherein, The hinge hole is obliquely arranged, and the hinge shaft is arranged in the hinge hole.

6. A concealed self-locking folding structure according to claim 1, characterized in that, The butt joint limiting structure includes a butt joint limiting groove and a butt joint limiting protrusion, one of the first end of the first folding piece and the first end of the second folding piece is provided with the butt joint limiting groove, and the other is provided with the butt joint limiting protrusion, when the first folding piece and the second folding piece are in the butt joint state, the butt joint limiting protrusion is located in the butt joint limiting groove, and the damping piece is arranged in the butt joint limiting groove.

7. The hidden self-locking folding structure according to claim 1, wherein, The installation groove is provided with a connecting shaft and a shaft sleeve, the connecting shaft is arranged along the width direction of the installation groove, the shaft sleeve is provided with an eccentric sleeve hole, the shaft sleeve is movably sleeved on the connecting shaft through the eccentric sleeve hole, the automatic snap lock is connected with the shaft sleeve and can rotate relative to the shaft sleeve, and the tension adjusting handle is connected with the shaft sleeve and can drive the shaft sleeve to synchronously rotate relative to the connecting shaft.

8. A concealed self-locking folding structure according to claim 7, characterized in that, The automatic snap lock comprises a snap end and a pressing end, a rotating connection hole is arranged between the snap end and the pressing end, the automatic snap lock is movably sleeved on the shaft sleeve through the rotating connection hole, the snap end is provided with a snap jaw, the first folding piece is provided with a matching jaw matched with the snap jaw, a self-locking elastic piece is arranged between the pressing end and the mounting groove, and the automatic snap lock is provided with a self-locking snap force by the self-locking elastic piece when the snap jaw is matched with the matching jaw.

9. A concealed self-locking folding structure according to claim 8, characterized in that, The tension adjusting handle comprises oppositely arranged first rotating connecting arms and second rotating connecting arms and a pulling part, one end of the first rotating connecting arms and one end of the second rotating connecting arms are connected with the pulling part, the other end of the first rotating connecting arms and the other end of the second rotating connecting arms are provided with polygonal connecting holes, both ends of the shaft sleeve are provided with polygonal connecting parts matched with the polygonal connecting holes, and the pressing end is located between the first rotating connecting arms and the second rotating connecting arms when the tension adjusting handle is locked, and the upper surface of the pressing end and the upper surface of the pulling part are flush with the groove of the mounting groove.

10. A folding bicycle, characterized by The folding bicycle frame comprises a first folding pipe and a second folding pipe, and a hidden self-locking folding structure as claimed in any one of claims 1-9 is arranged between the first folding pipe and the second folding pipe, the second end of the first folding piece is connected with the first folding pipe, and the second end of the second folding piece is connected with the second folding pipe.

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