Four-link efficient folding structure and folding scooter

Abstract

The present invention discloses a four-link efficient folding structure, comprising: a vertical rod; a connecting plate, which is arranged at one side of the vertical rod; an upper connecting rod, which is arranged between the vertical rod and the connecting plate, one end of the upper connecting rod is hinged to the upper part of the vertical rod through a first vertical rod rotating shaft, and the other end is hinged to the upper part of the connecting plate through an upper connecting rod rotating shaft; a lower connecting rod, which is arranged between the vertical rod and the connecting plate, one end of the lower connecting rod is hinged to the lower part of the vertical rod through a second vertical rod rotating shaft, and the other end is hinged to the lower part of the connecting plate through a lower connecting rod rotating shaft; a locking assembly, which is arranged between the upper connecting rod and the lower connecting rod, and the locking assembly is used to lock the upper connecting rod or the lower connecting rod when the folding structure is in an unfolded state; and a folding scooter using the above four-link efficient folding structure. The present invention has the advantages of beautiful structure, high folding efficiency, good folding effect, etc.

Description

Technical Field

[0001] The present invention relates to the field of folding structures, and more specifically, to a four-link high-efficiency folding structure and a folding scooter. Background Art

[0002] The folding efficiency and folding effect of portable folding transportation products are contradictory. To achieve an ideal folding effect, the folding steps are often complicated, and simple folding steps often make it difficult to achieve an ideal folding effect. In most cases, one folding action can only solve the folding of one dimension, and objects have three dimensions. Therefore, most folding transportation products often have more than three folding steps to have a better folding effect. It is very difficult to achieve fast folding while ensuring the folding effect.

[0003] The invention patent that has been published: "A High-efficiency Folding Electric Scooter (Patent Application Number: CN201910563644.4)" mentions the upper and lower connecting rod shifting and folding technology, which can achieve folding in two dimensions of height and length in one step. However, this patent locks the upper and lower connecting rods into a rigid structure by locking a certain point in the middle of the upper and lower connecting rods, which requires both the upper and lower connecting rods to have a large structural strength. This makes the folding structure heavy and bulky, making it inconvenient to carry. Summary of the invention

[0004] One object of the present invention is to provide a four-link high-efficiency folding structure, which adopts a simpler single-link locking structure to replace the patented double-link locking structure, so as to achieve folding in two dimensions of height and length in one step, while reducing the locking parts, it is more conducive to improving the aesthetics of the folding structure, reducing the weight of the folding structure, and having high folding efficiency and good folding effect.

[0005] Another object of the present invention is to provide a folding scooter using the four-link efficient folding structure.

[0006] In order to achieve the purpose and other advantages according to the present invention, a four-link efficient folding structure is provided, comprising:

[0007] Pole;

[0008] A connecting plate, which is arranged on one side of the vertical pole;

[0009] An upper connecting rod, which is arranged between the vertical rod and the connecting plate, wherein one end of the upper connecting rod is hinged to the upper part of the vertical rod through the first vertical rod rotating shaft, and the other end of the upper connecting rod is hinged to the upper part of the connecting plate through the upper connecting rod rotating shaft;

[0010] A lower connecting rod is provided between the vertical rod and the connecting plate, one end of the lower connecting rod is hinged to the lower part of the vertical rod through the second vertical rod rotating shaft, and the other end of the lower connecting rod is hinged to the lower part of the connecting plate through the lower connecting rod rotating shaft;

[0011] A locking assembly, which is disposed between the upper connecting rod and the lower connecting rod, and is used to lock the upper connecting rod or the lower connecting rod when the folding structure is in an unfolded state;

[0012] Wherein, the distance between the rotation axis of the first upright rod and the rotation axis of the second upright rod is greater than the distance between the rotation axis of the upper connecting rod and the rotation axis of the lower connecting rod.

[0013] Preferably, the four-bar efficient folding structure, the locking assembly includes a limiting hook and a unhooking pressure plate, the limiting hook includes an integrally formed first connection portion and a hook portion, the unhooking pressure plate includes a second connection portion and a push rod arranged on the second connection portion, wherein the first connection portion is hinged to the upper connection portion through an upper connection rod fixed shaft, the hook portion is arranged to be engaged with the lower connection rod rotation shaft when the folding structure is in an unfolded state, the second connection portion is hinged to the lower connection rod rotation shaft, and the push rod is arranged to be able to contact with the open end of the hook portion and to push the hook portion to be separated from the upper connection rod rotation shaft; or, the first connection portion is hinged to the lower connection portion through the lower connection rod fixed shaft, the hook portion is arranged to be engaged with the upper connection rod rotation shaft when the folding structure is in an unfolded state, the second connection portion is hinged to the upper connection rod rotation shaft, and the push rod is arranged to be able to contact with the open end of the hook portion and to push the hook portion to be separated from the upper connection rod rotation shaft.

[0014] Preferably, in the four-link efficient folding structure, a limit plate is provided at one end of the connecting plate away from the vertical rod, and the limit plate and the upper connecting rod are located in the same vertical plane; the other end surface of the upper connecting rod is inwardly recessed to form a cavity, and a through hole is provided on the side wall of the cavity for the upper connecting rod rotating shaft to pass through, and a limit slider is provided in the cavity, and the limit slider is slidably connected to the cavity along the axial direction of the other end of the upper connecting rod, and a waist hole is provided on the limit slider for the upper connecting rod rotating shaft to pass through. The waist hole is arranged axially along the other end of the upper connecting rod, and the length of the waist hole is greater than the diameter of the rotating axis of the upper connecting rod. A screw hole is arranged on the limit sliding block along the length direction of the waist hole, one end of the screw hole is connected with the waist hole, and the other end passes through the limit sliding block and is connected with the outside, and a limit adjustment top screw is arranged in the screw hole; wherein, the limit sliding block can contact with the limit plate under the action of the limit adjustment top screw, and the upper part of the longitudinal section of the contact surface is an arc surface bent toward the rotating axis direction of the upper connecting rod.

[0015] Preferably, the four-link high-efficiency folding structure, the upper link includes a first upper link and a second upper link symmetrically arranged, the lower link includes a first lower link and a second lower link symmetrically arranged, and the locking assembly includes a first locking assembly and a second locking assembly symmetrically arranged, wherein the first upper link, the first lower link and the first locking assembly are located on one side of the connecting plate, and the second upper link, the second lower link and the second locking assembly are located on the other opposite side of the connecting plate; one end of the first upper link and the second upper link is hinged to the upper part of the vertical rod through the first vertical rod rotation axis, and the other end of the first upper link and the second upper link is hinged to the upper part of the vertical rod through the first vertical rod rotation axis The upper connecting rod rotation axis is hinged to both sides of the upper part of the connecting plate, one end of the first lower connecting rod and the second lower connecting rod is hinged to the lower part of the vertical rod through the second vertical rod rotation axis, the other end of the first lower connecting rod and the second lower connecting rod is hinged to both sides of the lower part of the connecting plate through the lower connecting rod rotation axis, and the first upper connecting rod and the first lower connecting rod are respectively located in two parallel vertical planes; the first locking assembly and the second locking assembly are arranged between the corresponding first upper connecting rod and the first lower connecting rod or the second upper connecting rod and the second lower connecting rod, and the unhooking pressure plate of the first locking assembly and the unhooking pressure plate of the second locking assembly are connected as a whole through a connecting plate.

[0016] Preferably, in the four-link efficient folding structure, one end of the second connecting portion is hinged to the lower connecting rod rotation axis or the upper connecting rod rotation axis, and the other end is provided with a pedal, and the pedal is protruding from the second connecting portion.

[0017] Preferably, in the four-link efficient folding structure, a torsion spring is provided at the hinge between the first connecting portion and the upper connecting rod fixed axis or the lower connecting rod fixed axis, and the second connecting portion is provided with a compression spring connected to the upper connecting rod or the lower connecting rod.

[0018] Preferably, in the four-link efficient folding structure, one of the surface of the limit slider and the inner wall of the cavity is provided with a slide groove, and the other is provided with a slide rail, and the limit slider is slidably connected to the cavity through the cooperation of the slide groove and the slide rail.

[0019] Preferably, in the four-bar efficient folding structure, the upper link and the lower link each include an integrally formed first straight portion, a second straight portion and an arc portion disposed therebetween, and the curvature of the arc portion of the upper link is greater than that of the arc portion of the lower link.

[0020] The present invention also provides a folding scooter, comprising a handlebar, a connecting rod, a front wheel assembly, a pedal, a rear wheel assembly and the above-mentioned four-link high-efficiency folding structure, wherein the handlebar is connected to the upper end of the connecting rod, the lower end of the connecting rod is connected to the upper end of the vertical rod, the lower end of the vertical rod is connected to the front wheel assembly, the rear end of the connecting plate is connected to the front end of the pedal, and the rear end of the pedal is connected to the rear wheel assembly.

[0021] Preferably, in the folding scooter, a hook is provided on the upper portion of the upright, and a hook hole is provided on the top of the mudguard of the rear wheel assembly, and the hook can be connected to the hook hole when the folding structure is in a folded state.

[0022] The present invention has at least the following beneficial effects:

[0023] First, the present invention adopts a simpler single-link locking structure to replace the patented double-link locking structure, so as to achieve folding in two dimensions of height and length in one step. While reducing the locking parts, it is more conducive to improving the aesthetics of the folding structure, with high folding efficiency and good folding effect.

[0024] Second, compared with the locking method of the disclosed patent, the present invention has a significant improvement in structural strength. The disclosed patent locks the upper and lower connecting rods by locking a certain point in the middle of the upper and lower connecting rods to turn them into a rigid structure, which requires both the upper and lower connecting rods to have a large structural strength, which will inevitably increase the weight and volume of the folding structure. The locking method of the present invention only locks the rotation position of one of the upper and lower connecting rods, and does not constrain the other connecting rod. In this way, only the locked connecting rod needs to have a large structural strength, and the other connecting rod does not need a large structural strength. Under the same conditions, the structure is lighter.

[0025] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a structural schematic diagram of a four-link efficient folding structure in an unfolded state according to an embodiment of the present invention;

[0027] Figure 2 is a structural schematic diagram of a four-link efficient folding structure according to an embodiment of the present invention when it starts to fold;

[0028] Figure 3 is a structural schematic diagram of a foldable scooter in an unfolded state according to another embodiment of the present invention;

[0029] Figure 4 is a structural schematic diagram of a foldable scooter in a folded state according to another embodiment of the present invention;

[0030] Figure 5 is a schematic cross-sectional structural diagram of a foldable scooter in a fully folded state according to another embodiment of the present invention;

[0031] Figure 6 is an application example diagram of a folding scooter according to another embodiment of the present invention;

[0032] Figure 7 yes Figure 6 Exploded diagram. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with embodiments and drawings so that those skilled in the art can implement the invention with reference to the description.

[0034] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0035] It should be noted that, in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] like Figure 1-7 As shown, the present invention provides a four-link efficient folding structure, comprising:

[0037] Pole 1;

[0038] A connecting plate 2, which is arranged on one side of the vertical pole 1;

[0039] An upper connecting rod 3 is provided between the vertical rod 1 and the connecting plate 2, one end of the upper connecting rod 3 is hinged to the upper part of the vertical rod 1 through the first vertical rod rotation axis, and the other end is hinged to the upper part of the connecting plate 2 through the upper connecting rod rotation axis 4;

[0040] A lower connecting rod 5 is provided between the vertical rod 1 and the connecting plate 2, one end of the lower connecting rod 5 is hinged to the lower part of the vertical rod 1 through the second vertical rod rotation axis, and the other end is hinged to the lower part of the connecting plate 2 through the lower connecting rod rotation axis 6;

[0041] A locking assembly, which is disposed between the upper connecting rod 3 and the lower connecting rod 5, and is used to lock the upper connecting rod 3 or the lower connecting rod 5 when the folding structure is in an unfolded state;

[0042] Wherein, the distance between the first vertical rod rotation axis and the second vertical rod rotation axis is greater than the distance between the upper connecting rod rotation axis 4 and the lower connecting rod rotation axis 6 .

[0043] In the above technical scheme, the ends of the upper connecting rod 3 and the lower connecting rod 5 are respectively hinged to the corresponding rotating shafts on the vertical rod 1 and the connecting plate 2, so that the vertical rod 1, the connecting plate 2, the upper connecting rod 3 and the lower connecting rod 5 form a trapezoidal four-bar linkage structure. The deformation process of the trapezoidal four-bar linkage structure is utilized to realize the folding and front-to-back displacement of the vertical rod, so as to realize the folding of the height and length dimensions at the same time; when the folding structure is in the unfolded state, the upper connecting rod 3 or the lower connecting rod 5 is locked by the locking assembly, that is, the locking assembly only locks the rotation position of one of the upper and lower connecting rods, and does not constrain the other connecting rod. In this way, only the locked connecting rod needs to have a greater structural strength, and the other connecting rod does not need a greater structural strength, which greatly reduces the weight of the folding structure and makes the folding structure lighter.

[0044] In another technical solution, in the four-bar efficient folding structure, the locking assembly includes a limiting hook 7 and a unhooking pressure plate 8, the limiting hook 7 includes an integrally formed first connecting portion and a hook portion, the unhooking pressure plate 8 includes a second connecting portion and a push rod 9 arranged on the second connecting portion, wherein the first connecting portion is hinged to the upper connecting rod 3 through an upper connecting rod fixed shaft 10, the hook portion is arranged to be engaged with the lower connecting rod rotating shaft 6 when the folding structure is in an unfolded state, the second connecting portion is hinged to the lower connecting rod rotating shaft 6, and the push rod 9 is arranged to be able to contact with the open end of the hook portion and push the hook portion to separate from the lower connecting rod rotating shaft 6; or, the first connecting portion is hinged to the lower connecting rod 5 through a lower connecting rod fixed shaft, the hook portion is arranged to be engaged with the upper connecting rod rotating shaft 4 when the folding structure is in an unfolded state, the second connecting portion is hinged to the upper connecting rod rotating shaft 4, and the push rod 9 is arranged to be able to contact with the open end of the hook portion and push the hook portion to separate from the upper connecting rod rotating shaft 4. Here, a preferred structure of a locking assembly is listed, including a limit hook 7 and a unhooking pressure plate 8, which effectively reduces the number of parts of the locking assembly, has a simple structure and is easy to operate. Specifically, when the folding structure is in the unfolded state, the hook portion of the limit hook 7 is hooked on the upper connecting rod rotating shaft 4 to limit the lower connecting rod from rotating upward, or the hook portion of the limit hook 7 is hooked on the lower connecting rod rotating shaft 6 to limit the upper connecting rod from rotating upward; when the folding structure needs to be folded, the unhooking pressure plate 8 is rotated to make the push rod 9 on the unhooking pressure plate 8 push the limit hook 7 to rotate around the upper connecting rod fixed shaft 10 or the lower connecting rod fixed shaft connected thereto, so as to separate the hook portion of the limit hook 7 from the upper connecting rod rotating shaft 4 or the lower connecting rod rotating shaft 6 connected thereto, and the limit hook 7 no longer limits the upper connecting rod 3 or the lower connecting rod 5, so that the upper connecting rod 3 and the lower connecting rod 5 can rotate upward, thereby achieving folding with high folding efficiency.

[0045] In another technical solution, in the four-link efficient folding structure, a limit plate 11 is provided at one end of the connecting plate 2 away from the vertical rod 1, and the limit plate 11 and the upper connecting rod 3 are located in the same vertical plane; the other end surface of the upper connecting rod 3 is recessed inward to form a cavity 12, and a through hole is provided on the side wall of the cavity 12 for the upper connecting rod rotating shaft 4 to pass through, and a limit slider 13 is provided in the cavity 12, and the limit slider 13 is slidably connected to the cavity 12 along the axial direction of the other end of the upper connecting rod 3, and a waist hole 14 is provided on the limit slider 13 for the upper connecting rod rotating shaft 4 to pass through. The waist hole 14 is axially arranged along the other end of the upper connecting rod 3, and the length of the waist hole 14 is greater than the diameter 4 of the upper connecting rod rotation axis. A screw hole 15 is arranged on the limit slider 13 along the length direction of the waist hole 14, one end of the screw hole 15 is connected with the waist hole 14, and the other end passes through the limit slider 13 and is connected with the outside, and a limit adjustment top screw 16 is arranged in the screw hole 15; wherein, the limit slider 13 can contact with the limit plate 11 under the action of the limit adjustment top screw 16, and the upper part of the longitudinal section of the contact surface is an arc surface bent toward the direction of the upper connecting rod rotation axis 4. Here, further, the distance between the limit slider 13 and the limit plate 11 is adjusted by the limit adjustment top screw 16, so that the limit slider 13 contacts the limit plate 11. At the same time, since the upper part of the longitudinal section of the contact surface between the limit slider 13 and the limit plate 11 is an arc surface bent in the direction of the upper connecting rod rotation axis 4, the upper connecting rod 3 cannot rotate downward. The limit slider 13 cooperates with the locking assembly to lock the upper connecting rod when the folding structure is in the unfolded state, so that the connection is more stable after the folding structure is unfolded.

[0046] In another technical solution, in the four-bar efficient folding structure, the upper link 3 includes a first upper link and a second upper link symmetrically arranged, the lower link 5 includes a first lower link and a second lower link symmetrically arranged, and the locking assembly includes a first locking assembly and a second locking assembly symmetrically arranged, wherein the first upper link, the first lower link and the first locking assembly are located on one side of the connecting plate 2, and the second upper link, the second lower link and the second locking assembly are located on the other opposite side of the connecting plate 2; one end of the first upper link and the second upper link are hinged to the upper part of the vertical rod 1 through the first vertical rod rotation axis, and the other end of the first upper link and the second upper link are hinged to the upper part of the vertical rod 1 through the first vertical rod rotation axis, and the other end of the first upper link and the second upper link are hinged to the upper part of the vertical rod 1 through the first vertical rod rotation axis. The upper connecting rod rotating shaft 4 is hinged to the upper two sides of the connecting plate 2, one end of the first lower connecting rod and the second lower connecting rod is hinged to the lower part of the vertical rod 1 through the second vertical rod rotating shaft, the other end of the first lower connecting rod and the second lower connecting rod is hinged to the lower two sides of the connecting plate 2 through the lower connecting rod rotating shaft 6, and the first upper connecting rod and the first lower connecting rod are respectively located in two parallel vertical planes; the first locking assembly and the second locking assembly are arranged between the corresponding first upper connecting rod and the first lower connecting rod or the second upper connecting rod and the second lower connecting rod, and the unhooking pressure plate 8 of the first locking assembly and the unhooking pressure plate 8 of the second locking assembly are connected as a whole through a connecting plate 17. Here, a preferred structure of the folding structure is listed, by providing two upper connecting rods 3, two lower connecting rods 5 and two locking assemblies, and dividing them into two groups, symmetrically arranged on both sides of the connecting plate 2, so that the folding structure can stand stably on the ground after being unfolded; the unhooking pressure plate 8 of the first locking assembly and the second locking assembly are connected as a whole through the connecting plate 17, so as to synchronously lock the first upper connecting rod and the second upper connecting rod or the first lower connecting rod and the second lower connecting rod when the folding structure is in the unfolded state, thereby simplifying the folding or locking operation.

[0047] In another technical solution, in the four-link efficient folding structure, one end of the second connecting portion is hinged to the lower connecting rod rotating shaft 6 or the upper connecting rod rotating shaft 4, and the other end is provided with a pedal 18, and the pedal 18 protrudes from the second connecting portion, so that by stepping on the pedal 18 with the foot, the unhooking pressure plate 8 is driven to rotate, thereby realizing the separation of the hook portion of the limiting hook 7 from the upper connecting rod rotating shaft 4 or the lower connecting rod rotating shaft 6 connected thereto, making the folding operation simpler and more labor-saving.

[0048] In another technical solution, the four-link efficient folding structure is provided with a torsion spring 19 at the hinge between the first connection portion and the upper link fixed shaft 10 or the lower link fixed shaft, and the second connection portion is provided with a compression spring 20 connected to the upper link 3 or the lower link 5. Here, the torsion spring 19 and the compression spring 20 are used to limit the rotation angle of the limit hook 7 and the unhooking pressure plate 8, respectively, and when the external force is removed, the limit hook 7 and the unhooking pressure plate 8 are reset.

[0049] In another technical solution, in the four-link efficient folding structure, one of the surface of the limit slider 13 and the inner wall of the cavity 12 is provided with a slide groove, and the other is provided with a slide rail. The limit slider 13 is slidably connected with the cavity 12 through the cooperation of the slide groove and the slide rail. Specifically, the longitudinal sections of the slide groove and the slide rail can be set to a dovetail shape, or the longitudinal section of the slide groove can be set to a "C-shape", and the longitudinal section of the slide rail can be set to a "G" shape, so as to prevent the slide rail from falling out of the slide groove, so that the connection between the slide groove and the slide rail is more stable.

[0050] In another technical solution, in the four-link efficient folding structure, the upper link 3 and the lower link 5 each include an integrally formed first straight portion, a second straight portion, and an arc portion disposed therebetween, and the arc of the arc portion of the upper link 3 is greater than the arc of the arc portion of the lower link 5. This lists a preferred structure of the upper link 3 and the lower link 5 to make the appearance of the folding structure more compact and beautiful.

[0051] like Figure 1-7 As shown, the present invention also provides a folding scooter, comprising a handlebar 21, a connecting rod 22, a front wheel assembly 23, a pedal 24, a rear wheel assembly 25 and the above-mentioned four-link efficient folding structure, wherein the handlebar 21 is connected to the upper end of the connecting rod 22, the lower end of the connecting rod 22 is pivotally connected to the upper end of the vertical rod 1, the lower end of the vertical rod 1 is connected to the front wheel assembly 23, the rear end of the connecting plate 2 is connected to the front end of the pedal 24, and the rear end of the pedal 24 is connected to the rear wheel assembly 25.

[0052] In the above technical solution, the four-link high-efficiency folding structure is applied to the folding scooter, which can realize the folding of the folding scooter in two dimensions of height and length in one step, with high folding efficiency and good folding effect; in addition to being applied to folding scooters, the above four-link high-efficiency folding structure can also be applied to other portable vehicles such as folding bicycles and folding electric vehicles. Specifically, the pedal 24 is integrally formed with the connecting plate 2, and a limit hook 7 is installed on the upper connecting rod 3. One end of the limit hook 7 is connected to the upper connecting rod 3 through the upper connecting rod fixed axis 10 and can rotate around this axis, and the other end is a hook-shaped structure. When the vehicle body is in the open position, the hooked end will hook on the lower connecting rod rotating axis 6, limiting the upper connecting rod 3 from rotating upward around the upper connecting rod rotating axis 4. At the same time, it cannot rotate downward under the action of the limit slider 13 at the other end of the upper connecting rod 3. The limit adjustment top screw 16 in the limit slider 13 plays a role The function of adjusting the tightness is that the upper connecting rod 3 is locked. When it is necessary to park or fold, the unhooking pressure 8 is stepped on with the foot, and the push rod 9 on the unhooking pressure plate 8 will press the limit hook 7, so that it withdraws from the lower connecting rod rotating shaft 6, so that the upper connecting rod 3 can be rotated upward. At the same time, under the joint action of the lower connecting rod 5, the handlebar upright is flipped to a horizontal angle, and the two-dimensional folding is completed in one step, which maximizes the folding efficiency and folding effect; in addition to locking the upper connecting rod 3, the above-mentioned connecting rod locking method can also lock the lower connecting rod 5, which will not be repeated here.

[0053] In another technical solution, in the folding scooter, a hook 26 is provided on the upper portion of the upright 1, and a hook hole 28 is provided on the top of the mudguard 27 of the rear wheel assembly 25. The hook 26 can be connected to the hook hole 28 when the folding structure is in a folded state to lock the position of the folded state. When it needs to be opened, just move the hook 26 to disengage it from the hook hole 28.

[0054] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. Four-link efficient folding structure, characterized by: include: Pole; A connecting plate, which is arranged on one side of the vertical pole; An upper connecting rod, which is arranged between the vertical rod and the connecting plate, wherein one end of the upper connecting rod is hinged to the upper part of the vertical rod through the first vertical rod rotating shaft, and the other end of the upper connecting rod is hinged to the upper part of the connecting plate through the upper connecting rod rotating shaft; A lower connecting rod is provided between the vertical rod and the connecting plate, one end of the lower connecting rod is hinged to the lower part of the vertical rod through the second vertical rod rotating shaft, and the other end of the lower connecting rod is hinged to the lower part of the connecting plate through the lower connecting rod rotating shaft; A locking assembly, which is disposed between the upper connecting rod and the lower connecting rod, and is used to lock the upper connecting rod or the lower connecting rod when the folding structure is in an unfolded state; Wherein, the distance between the rotation axis of the first upright rod and the rotation axis of the second upright rod is greater than the distance between the rotation axis of the upper connecting rod and the rotation axis of the lower connecting rod, The locking assembly comprises a limiting hook and a disengaging pressure plate, the limiting hook comprises an integrally formed first connection portion and a hook portion, the disengaging pressure plate comprises a second connection portion and a push rod arranged on the second connection portion, wherein the first connection portion is hinged to the upper connection portion through an upper connecting rod fixed shaft, the hook portion is arranged to be clamped with the rotating shaft of the lower connecting rod when the folding structure is in an unfolded state, the second connection portion is hinged to the rotating shaft of the lower connecting rod, and the push rod is arranged to be able to contact with the open end of the hook portion and to push the hook portion to be separated from the rotating shaft of the upper connecting rod; or, the first connection portion is hinged to the lower connecting rod fixed shaft and the lower connecting rod is hinged to the The cam is provided with a stopper at one end away from the vertical rod, and the stopper and the upper connecting rod are located in the same vertical plane; the end surface of the other end of the upper connecting rod is recessed inwardly to form a cavity, and a through hole is provided on the side wall of the cavity for the rotation axis of the upper connecting rod to pass through the through hole, and a limit slider is provided in the cavity, and the limit slider is slidably connected to the cavity along the axial direction of the other end of the upper connecting rod, and the limit slider is provided with a waist hole for the rotation axis of the upper connecting rod to pass through, and the waist hole is arranged along the axial direction of the other end of the upper connecting rod, and the length of the waist hole is greater than the diameter of the rotation axis of the upper connecting rod, and a screw hole is provided on the limit slider along the length direction of the waist hole, one end of the screw hole is connected with the waist hole, and the other end passes through the limit slider and is connected with the outside, and a limit adjustment screw is provided in the screw hole; wherein, the limit slider can contact the limit plate under the action of the limit adjustment screw, and the upper part of the longitudinal section of the contact surface is an arc surface bent in the direction of the rotation axis of the upper connecting rod, The upper connecting rod comprises a first upper connecting rod and a second upper connecting rod symmetrically arranged, the lower connecting rod comprises a first lower connecting rod and a second lower connecting rod symmetrically arranged, and the locking assembly comprises a first locking assembly and a second locking assembly symmetrically arranged, wherein the first upper connecting rod, the first lower connecting rod and the first locking assembly are located on one side of the connecting plate, and the second upper connecting rod, the second lower connecting rod and the second locking assembly are located on the other opposite side of the connecting plate; one end of the first upper connecting rod and the second upper connecting rod is hinged to the upper part of the vertical rod through the first vertical rod rotation axis, and the other end of the first upper connecting rod and the second upper connecting rod is hinged to the upper part of the vertical rod through the upper connecting rod rotation axis The upper two sides of the connecting plate are hinged, one end of the first lower link and the second lower link is hinged to the lower part of the vertical rod through the second vertical rod rotation axis, the other ends of the first lower link and the second lower link are hinged to the lower two sides of the connecting plate through the lower link rotation axis, and the first upper link and the first lower link are respectively located in two parallel vertical planes; the first locking assembly and the second locking assembly are arranged between the corresponding first upper link and the first lower link or the second upper link and the second lower link, and the unhooking pressure plate of the first locking assembly and the unhooking pressure plate of the second locking assembly are connected as a whole through the connecting plate, One end of the second connecting portion is hinged to the lower connecting rod rotating shaft or the upper connecting rod rotating shaft, and the other end is provided with a pedal, and the pedal is protruding from the second connecting portion. A torsion spring is provided at the hinged position between the first connecting portion and the upper connecting rod fixed shaft or the lower connecting rod fixed shaft, and a compression spring connected to the upper connecting rod or the lower connecting rod is provided on the second connecting portion. One of the surface of the limit slider and the inner wall of the cavity is provided with a slide groove, and the other is provided with a slide rail. The limit slider is slidably connected with the cavity through the cooperation of the slide groove and the slide rail. The upper connecting rod and the lower connecting rod each include an integrally formed first straight portion, a second straight portion and an arc portion disposed therebetween, and the arc of the arc portion of the upper connecting rod is greater than that of the arc of the lower connecting rod.

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