CN214420538U

CN214420538U - Foldable joint and foldable frame

Info

Publication number: CN214420538U
Application number: CN202120367291.3U
Authority: CN
Inventors: 陈贯一
Original assignee: Fujian Rongzhong Renfa Children Products Co ltd
Current assignee: Fujian Rongzhong Renfa Children Products Co ltd
Priority date: 2021-02-07
Filing date: 2021-02-07
Publication date: 2021-10-19
Anticipated expiration: 2031-02-07

Abstract

The application relates to a foldable joint and a foldable frame. Each connecting pipe of the foldable joint can be coaxially hinged through the corresponding control connecting part, the first connecting part or the second connecting part, the hinge structure is simple, an external linkage structure is not needed, and the production efficiency can be effectively improved; when in operation, the second rotating piece and the first rotating piece can be sequentially rotated to be folded or unfolded by controlling the control mechanism and even the connecting part, and the operation process is simple and quick; the second pin shaft can improve the rotation stability between the second rotating mechanism and the control mechanism; meanwhile, the foldable joint is adopted, so that the front foot tube, the rear foot tube and the handle connecting tube of the foldable frame can be folded or unfolded quickly, and the foldable frame is simple in structure and small in potential safety hazard. The folding and unfolding of the folding and unfolding device can be realized through the handle connecting rod.

Description

Foldable joint and foldable frame

Technical Field

The application relates to a foldable joint and a foldable frame.

Background

The support structure is often formed by connecting a plurality of connecting pipes, such as a vehicle frame, a storage basket frame, a table and chair support, a storage rack and the like. In order to facilitate the storage and reduce the occupied space, the connecting pipes of the support structure are connected in a hinged mode, so that the support structure can be folded. When the folding device is folded, a user rotates the connecting pipes to enable the connecting pipes to be close to each other as much as possible and to be folded; when the bracket is unfolded, the connecting pipes are manually operated in sequence by a user, so that the connecting pipes are relatively rotated and separated, and the bracket structure is in a use state. At present, a linkage structure is often installed between each connecting pipe of a support structure, and the folding or unfolding efficiency of the support structure is improved.

Aiming at the related technologies, the inventor thinks that the linkage structure is connected with each connecting pipe, and the formed support structure is complicated and tedious, and the production process is troublesome and time-consuming.

SUMMERY OF THE UTILITY MODEL

In order to simplify the linkage structure of each connecting pipe, improve production efficiency, this application provides a can receive and close joint and collapsible frame.

In a first aspect, the present application provides a foldable joint, which adopts the following technical solutions:

a foldable joint comprises a joint pin shaft, an operation and control mechanism, a first rotating mechanism, a second rotating mechanism and a plug mechanism; the joint pin shaft penetrates through the control mechanism, the first rotating mechanism and the second rotating mechanism, and the first rotating mechanism, the second rotating mechanism and the plug mechanism can rotate around the joint pin shaft;

the control mechanism is provided with a control groove for switching the joint pin shaft in a staggered manner, the control groove is provided with a first pin shaft parallel to the joint pin shaft, and the control mechanism is used for driving the first pin shaft to rotate around the joint pin shaft; the control mechanism is provided with a control connecting part;

the first rotating mechanism is provided with a first track groove for the first pin shaft to slide around the joint pin shaft; the motion track of the first pin shaft, which slides from one end of the first track groove to the other end of the first track groove around the joint pin shaft, is an arc, and the radian is a first radian; the first rotating mechanism is provided with a first connecting part;

the second rotating mechanism is provided with a second track groove for the first pin shaft to slide around the joint pin shaft; the motion track of the first pin shaft, which slides from one end of the second track groove to the other end of the second track groove around the joint pin shaft, is an arc, and the radian is a second radian; the second rotating mechanism is provided with a second connecting part; the first arc is greater than the second arc.

By adopting the technical scheme; during the use, control connecting portion, first connecting portion and second connecting portion and can be used to connect different connecting pipes. Because the first track groove and the second track groove are coaxially arranged, and the first radian is greater than the second radian, when the control mechanism drives the first pin shaft to rotate around the joint pin shaft along one end of the first track groove and one end of the second track groove towards the other end, the first pin shaft firstly abuts against the other end of the second track groove; then the first pin shaft pushes the other end of the second track groove to drive the second rotating mechanism to continuously rotate along with the control mechanism until the first pin shaft abuts against the other end of the first track groove; therefore, the control mechanism drives the control mechanism, the first rotating mechanism and the second rotating mechanism to rotate towards the same direction, the control connecting part, the first connecting part and the second connecting part can mutually form at least two different position relations, and the mutual position change of the control connecting part, the first connecting part and the second connecting part, such as relative folding or relative unfolding, is realized. And control the connecting portion and can rotate the second radian relatively to the second connecting portion alone along with controlling the mechanism at least, do not influence the position of the first connecting portion relative to the second connecting portion.

The joint can be folded, the overall structure is simple, the connecting pipes can be correspondingly connected through the different connecting pipes, the first connecting part or the second connecting part are coaxially hinged, the hinge structure is simple, an external linkage structure is not needed, and the production efficiency is effectively improved. And when the folding and unfolding device is used and operated, the second rotating part and the first rotating part can be sequentially rotated by controlling the control mechanism and even the connecting part, so that the control mechanism, the first rotating mechanism and the second rotating mechanism can be folded or unfolded, and the operation process is simple and quick. The plug mechanism is used for quickly plugging other devices different from the vehicle frame.

Optionally, the second rotating mechanism is provided with a second pin shaft staggered with the second track groove, and the second pin shaft is parallel to the joint pin shaft;

the first rotating mechanism is provided with a first extending track groove for the second pin shaft to slide around the joint pin shaft; the motion track of the second pin shaft, which slides from one end of the first extension track groove to the other end of the first extension track groove around the joint pin shaft, is an arc, and the radian is a first extension radian; the first extension radian is not greater than a radian difference between the first radian and the second radian.

By adopting the technical scheme, the first rotating mechanism and the second rotating mechanism rotate around the joint pin shaft through the second pin shaft and the second extending track groove, and the rotating angle of the first connecting part and the second connecting part which are relatively unfolded or relatively folded is limited. If the second connecting part is unfolded relative to the first connecting part, the second pin shaft is abutted against one end of the first extending track groove; when the second connecting part is folded relative to the first connecting part, the second pin shaft is abutted against the other end of the first extending track groove. And when the first connecting part and the second connecting part are relatively unfolded, the second pin shaft can also abut against one side of the first extending track groove far away from the first folding end, so that the first rotating mechanism is limited to rotate, and the unfolded support structure can be stabilized.

Optionally, the control groove extends along the joint pin shaft in the radial direction to form a strip-shaped groove; the control connecting part is close to the control groove;

the first extending track groove and the first track groove are staggered along the radial direction of the joint pin shaft; the first extending track grooves are communicated, one end of each first extending track groove is abutted against one end of each first track groove, and the other end of each first extending track groove extends towards the other end of each first track groove; the first connecting part is close to one end of the first track groove, which is abutted against the first extending track groove;

one end of the second track groove extends along the joint pin shaft in the radial direction to form a clamping groove matched with the outer diameter of the first pin shaft, and the clamping groove is used for limiting the first pin shaft to slide along the second track groove; when the second rotating mechanism moves to the position that the first pin shaft abuts against the clamping groove, the first pin shaft just moves from the first track groove to the first extending track groove, and the control groove moves from one end to the other end; the second connecting portion is close to the card slot.

By adopting the above technical scheme, the control mechanism can drive the first pin shaft to move along the control groove, and control the first pin shaft to move between the first track groove and the first extension track groove, or drive the first pin shaft to move between the second track groove and the clamping groove, so that the control mechanism is improved to drive the first pin shaft, the second rotating mechanism, the second pin shaft and the first rotating mechanism move or rotate along with the first pin shaft, the relative positions of the control connecting part, the first connecting part and the second connecting part are changed, and the control connecting part, the first connecting part and the second connecting part are relatively unfolded or folded.

Further, the unfolding operation of the control mechanism, the first rotating mechanism and the second rotating mechanism can be further performed as follows: the first pin shaft is controlled by the control mechanism to penetrate through the first extending track groove or the clamping groove, the first pin shaft slides from one end, close to the first connecting part, of the first track groove to be abutted against the other end, the second connecting part rotates along with the first pin shaft, the first connecting part and the second connecting part can be unfolded relatively, and at the moment, one end, far away from the first connecting part, of the first track groove is coaxially corresponding to one end, far away from the second connecting part, of the second track groove; then, the control mechanism drives the first pin shaft to be separated from the clamping groove and the first extending track groove, the first pin shaft enters the first track groove and the second track groove, and the first pin shaft slides along the first track groove and the second track groove to the second pin shaft to abut against one end of the first track groove, which is far away from the first connecting part, and abut against one end of the second track groove, which is far away from the second connecting part, so that the control connecting part, the first connecting part and the second connecting part are respectively and relatively unfolded.

Optionally, one end of the first extending track groove, which is far away from the first connecting portion, is provided with a guide surface for the first pin shaft to move from the first extending track groove to the first track groove.

By adopting the technical scheme, the first pin shaft can automatically move from the first extending track groove to the first track groove along the sliding inertia of the first extending track groove through the guide surface, the first pin shaft slides from one end of the control groove to the other end of the control groove, and the first pin shaft is controlled by external force to apply force along the length direction of the control groove; and simultaneously, the first pin shaft is separated from the clamping groove and enters the second track groove.

Optionally, a first limiting hole correspondingly matched with the control slot extends from one end of the first track slot, which is far away from the first connecting part; one end of the second track groove, which is far away from the clamping groove, extends to form a second limiting hole correspondingly matched with the control groove

By adopting the technical scheme, when the first rotating mechanism, the second rotating mechanism and the control mechanism rotate to the unfolding state, the first pin shaft is simultaneously positioned in the control groove, the first limiting hole and the second limiting hole; the foldable joint is stable in the unfolded state structure.

Optionally, the width of the control slot gradually decreases from the end, which drives the first pin to slide around the first track slot, to the other end.

Through adopting above-mentioned technical scheme, the groove width of controlling the groove can improve first round pin axle and control the steadiness that the groove is connected, reduces to receive under the expansion state to close the joint and use and rock, improves the steadiness.

Optionally, the control mechanism comprises a moving member and a rotating member; the control connecting part is fixed on the rotating part; the control slot is positioned on the rotating piece; one end of the first pin shaft penetrates through the control groove and is connected to the moving part; the moving piece is provided with a moving waist hole for the joint pin shaft to move along the length direction of the control groove; the length of the movable waist hole is matched with that of the control slot.

By adopting the technical scheme, the telescopic part between the moving part and the rotating part can drive the first pin shaft to normally abut against one end of the control groove, so that the step of controlling the first pin shaft to move along the control groove in the folding or unfolding process is reduced, and an operator can conveniently confirm that the rotating part or the moving part drives the first pin shaft to move in place.

Optionally, the control mechanism is provided with a control track groove for the second pin shaft to slide around the joint pin shaft; the control track groove is staggered with the control groove; the first track groove and the first extending track groove are through grooves, the control track groove and the control groove are through grooves or the second track groove is a through groove.

By adopting the technical scheme, the control track groove is connected with the second pin shaft, so that the connection stability of the control mechanism and the first rotating mechanism or the second rotating mechanism can be improved, and the control mechanism can drive the second rotating mechanism to rotate around the joint pin shaft more stably. And according to the user demand, the order that the mechanism, first slewing mechanism and second slewing mechanism wear to locate the joint round pin axle can be controlled, and the position that the mechanism that is located the centre wears to locate first round pin axle and second round pin axle then is the through groove.

Optionally, the joint pin shaft connector further comprises a plug mechanism penetrating through the joint pin shaft; the plug mechanism is positioned on one side of the control mechanism; and at least one of the control mechanism, the first rotating mechanism or the second rotating mechanism is provided with a limiting component for limiting the rotation of the plug mechanism.

By adopting the technical scheme, the plug mechanism can be connected with other connecting pipes, and the rotation range of the plug mechanism is controlled by utilizing the limiting assembly and the reversing rotation hole.

Optionally, the plug mechanism is provided with a reversing rotating hole for the limiting assembly to rotate around the joint pin shaft; the limiting assembly comprises a first limiting piece and a second limiting piece, and the first limiting piece and the second limiting piece are both arranged in the reversing rotating hole in a penetrating manner; the maximum radian formed by the rotation of the first limiting part and the second limiting part around the joint pin shaft is not greater than the reversing rotation hole.

By adopting the technical scheme, the limiting assembly can limit the rotation range of the plug mechanism relative to the joint pin shaft, so that the rotation angle of the plug mechanism can be adjusted according to requirements, the stability of the rotated angle can be kept, and the use safety is improved. After the plug mechanism is adjusted in a rotating mode, at least one of the first limiting part and the second limiting part abuts against one end of the reversing rotating hole to limit the reversing rotating hole to rotate, and use safety is affected.

In a second aspect, the present application provides a foldable frame, which adopts the following technical scheme:

a foldable frame comprises two groups of side frames; each side frame comprises a front foot tube, a rear foot tube, a handle connecting tube and the foldable joint; the foldable joint is used for hinging the front foot tube, the rear foot tube and the handle connecting tube; one of the front foot tube and the rear foot tube is connected with the first connecting part, and the other one of the front foot tube and the rear foot tube is connected with the second connecting part; the handle connecting pipe is connected with the control connecting part.

By adopting the technical scheme, the foldable joint is adopted, so that the front foot tube, the rear foot tube and the handle connecting tube of the foldable frame can be quickly folded or unfolded, and the foldable frame is simple in structure and small in potential safety hazard. The folding and unfolding of the folding and unfolding device can be realized through the handle connecting rod.

Optionally, the first rotating mechanism is located between the manipulating mechanism and the second rotating mechanism; the rear foot tube is connected to the first connecting part, and the front foot tube is connected to the second connecting part; the distance between the two front foot tubes, the distance between the two rear foot tubes and the distance between the two handle connecting tubes are sequentially increased.

By adopting the technical scheme, when the bicycle frame is folded, the two front foot tubes are positioned between the two rear foot tubes, the two handle connecting tubes are positioned outside the two rear foot tubes, the front foot tubes, the rear foot tubes and the handle connecting tubes can be close to each other as much as possible, and the occupied space of the bicycle frame is reduced.

Optionally, an arm lock mechanism for limiting the front leg tube from unfolding relative to the rear leg tube is installed between the front leg tube and the rear leg tube.

By adopting the technical scheme, when the front foot tube rotates towards the rear foot tube to the folding state, the front foot tube can be abutted against the rear foot tube, and the arm lock mechanism can be utilized to limit the movement of the front foot tube and the rear foot tube so that the front foot tube and the rear foot tube keep the relative folding state, thereby reducing the influence on folding use caused by the fact that the front foot tube is unfolded relative to the rear foot tube when the folding needs to be kept.

In summary, the present application includes at least one of the following beneficial technical effects:

1. each connecting pipe can be coaxially hinged through the corresponding control connecting part, the first connecting part or the second connecting part, the hinge structure is simple, an external linkage structure is not needed, and the production efficiency can be effectively improved;

2. when in operation, the second rotating piece and the first rotating piece can be sequentially rotated to be folded or unfolded by controlling the control mechanism and even the connecting part, and the operation process is simple and quick;

3. the second pin shaft can improve the rotation stability between the second rotating mechanism and the control mechanism;

4. the foldable joint is adopted, so that the front foot tube, the rear foot tube and the handle connecting tube of the foldable frame can be folded or unfolded quickly, and the foldable frame is simple in structure and small in potential safety hazard. The folding and unfolding of the folding and unfolding device can be realized through the handle connecting rod.

Drawings

Fig. 1 is a schematic structural view of a foldable frame of the present application in a folded state;

fig. 2 is an exploded view of the foldable joint of the present application from a first perspective;

fig. 3 is an exploded view of the foldable joint of the present application from a second perspective;

FIG. 4 is an exploded view of the steering mechanism of the present embodiment from a first perspective;

FIG. 5 is a schematic view of the connection structure of the control mechanism and the handle connecting tube according to the embodiment of the present application;

FIG. 6 is an exploded view of the steering mechanism of the present embodiment from a second perspective;

FIG. 7 is an exploded view of the first rotating mechanism in the embodiment of the present application;

FIG. 8 is an exploded view of the second rotation mechanism of the embodiment of the present application from a first perspective;

FIG. 9 is an exploded view of the second rotating mechanism of the embodiment of the present application from a second perspective;

FIG. 10 is a drawing in use of the foldable frame of the embodiment of the present application;

fig. 11 is a schematic position diagram illustrating a retracted state of the manipulation mechanism, the first rotating mechanism, and the second rotating mechanism according to the embodiment of the present disclosure;

fig. 12 is a schematic position diagram of the deployed states of the steering mechanism, the first rotating mechanism and the second rotating mechanism in the embodiment of the present application;

FIG. 13 is a schematic structural view of a plug mechanism in an embodiment of the present application;

FIG. 14 is a schematic structural view of the present application in an unfolded state of the foldable frame;

FIG. 15 is an exploded view of the handle connecting tube and the operating mechanism of the present application;

FIG. 16 is a schematic structural view of an arm lock mechanism in an embodiment of the present application;

fig. 17 is a schematic position diagram of the manipulation track groove, the first track groove, the second track groove, the first pin, etc. in fig. 10;

FIG. 18 is a schematic position diagram of the manipulation track groove, the first track groove, the second track groove, the first pin and the like in the unfolded state of the foldable joint in the embodiment of the present application;

FIG. 19 is a schematic diagram of positions of a manipulation track groove, a first track groove, a second track groove, a first pin and the like in the process of folding the joint according to the embodiment of the present application.

Description of reference numerals: 1. a front leg tube; 11. a wheel; 2. a rear foot tube;

3. a handle connecting pipe; 31. pushing and pulling the pipe; 32. a handle waist hole; 33. handle pin holes; 34. a sliding member; 341. a through hole; 342. sliding waist holes; 35. a lock hole; 36. a lock body; 361. an inclined bar hole; 37. a locking block; 371. a guiding conical surface; 372. a pin rod; 38. a pressure spring;

4. the joint can be folded; 41. a first pin shaft; 42. a second pin shaft; 421. a second limiting member; 5. a joint pin shaft; 51. a cap portion;

6. an operating mechanism; 61. a moving member; 611. a groove; 612. moving the waist hole; 613. moving the pin hole; 62. a rotating member; 621. a joint cover; 622. intra-articular reinforcement patches; 623. a limiting sheet; 6231. an outer limit portion; 6232. an inner ring portion; 6233. a limiting connecting part; 624. a joint side groove; 625. a joint center hole; 626. a joint center tube; 627. a control slot; 628. a manipulation trajectory slot; 6281. controlling a receiving end; 6282. controlling the unfolding end; 629. an outer convex groove; 63. a control connection; 631. a moving groove; 632. a convex column; 64. a telescoping member; 65. an extra-articular augmentation plate; 651. an outer strip hole; 66. an outer cover;

7. a first rotating mechanism; 71. a first rotating cover; 711. a first central aperture; 712. a first center tube; 72. a first reinforcing sheet; 73. a first track groove; 731. a first closing end; 732. a first deployment end; 74. a first connection portion; 75. a first extended track groove; 76. a first limiting hole; 77. a guide surface; 78. a first limit piece;

8. a second rotating mechanism; 81. a second rotating cover; 811. a second central aperture; 812. a second center tube; 82. a second reinforcing sheet; 821. a second track groove; 8211. a second closing end; 8212. a second deployment end; 822. a second pin hole; 83. a second connecting portion; 84. a card slot; 85. a second limiting hole; 86. a limiting rotation hole;

9. a plug mechanism; 91. a plug cover; 92. a plug reinforcing plate; 93. a plug connecting portion; 94. a reversing rotation hole;

10. an arm lock mechanism; 101. fixing the lock seat; 1011. a first arc-shaped chute; 1012. a second arc-shaped chute; 1013. a central hole of the lock seat; 102. a movable locking piece; 1021. a locking piece central hole; 1022. a first clamping block; 1023. a second fixture block; 1024. a locking piece fixing groove; 1025. a locking plate; 1026. locking the groove; 103. a fastener; 104. a lock pin; 105. a torsion spring.

Detailed Description

The present application is described in further detail below with reference to figures 1-19.

A common frame of a foldable baby carriage or a foldable handcart or a wheelchair in daily life belongs to a support structure connected by a plurality of connecting pipes. In the actual production process, in order to facilitate folding or unfolding, a linkage structure is often additionally arranged between the connecting pipes, the additionally arranged linkage structure is generally positioned outside the connecting pipes, the overall structure is relatively complex, and meanwhile, the linkage structure is formed by hinging connecting rods or connecting sheets, so that more parts need to be connected in the production process, the production efficiency is lower, and more time is consumed. When in use, an operator needs to confirm that no other irrelevant objects are clamped in the linkage structure, so as to avoid influencing the unfolding or folding operation.

Furthermore, if the supporting structure is the connection structure of the front leg, the rear leg and the handle of the frame of the baby carriage, such as a joint structure. When the front foot and the rear foot are folded at present, the front foot and the rear foot rotate relatively to be folded until the front foot drives the corresponding wheel 11 to be partially positioned at the rear side of the rear foot; then the handle is turned downwards to the rear side until the handle is positioned at the rear side of the rear foot and is abutted against the rear side of the front foot. Obviously, the space between the lower parts of the folded frame is larger, and the occupied space is small. Therefore, how to simplify the joint structure and make the space occupied by the foldable frame in the folded state is the problem to be solved.

The embodiment of the application discloses collapsible frame.

Referring to FIG. 1, a foldable frame includes two sets of side frames; each side frame comprises a front foot pipe 1, a rear foot pipe 2, a handle connecting pipe 3 and a foldable joint 4. The foldable joint 4 is arranged at one end of the front foot tube 1, the back foot tube 2 and the handle connecting tube 3 which are hinged, and the foldable joint 4 is used for hinging the front foot tube 1, the back foot tube 2 and the handle connecting tube 3.

A push-pull pipe 31 is connected between the ends of the two handle connecting pipes 3 far away from the foldable joint 4, and wheels 11 are mounted at the ends of the front foot pipe 1 and the rear foot pipe 2 far away from the foldable joint 4. The distance between the two front foot tubes 1, the distance between the two rear foot tubes 2 and the distance between the two handle connecting tubes 3 are increased in sequence. When the folding machine is folded, the two handle connecting pipes 3 are positioned at the outer sides of the rear foot pipes 2, the two front foot pipes 1 are positioned between the two rear foot pipes 2, and the handle connecting pipes 3 and the front foot pipes 1 are folded towards the rear foot pipes 2 in a turning way.

Referring to fig. 2 and 3, the foldable joint 4 includes a joint pin 5, a control mechanism 6, a first rotating mechanism 7, a second rotating mechanism 8 and a plug mechanism 9; one end of the joint pin shaft 5 is connected with the control mechanism 6, and the other end of the joint pin shaft sequentially penetrates through the first rotating mechanism 7 and the second rotating mechanism 8 to be hinged with the plug mechanism 9; the first rotating mechanism 7, the second rotating mechanism 8 and the plug mechanism 9 can rotate around the joint pin shaft 5.

Referring to fig. 4, the manipulation mechanism 6 includes a moving member 61 and a rotating member 62. The rotating piece 62 comprises a joint cover 621, an intra-joint reinforcing piece 622 and a limiting piece 623; a joint side groove 624 for mounting the joint inner reinforcing sheet 622 and the limiting sheet 623 is arranged on one side of the joint cover 621 close to the first rotating mechanism 7; the joint center hole 625 matched with the joint pin shaft 5 is arranged in the middle of the joint cover 621, a joint center tube 626 sleeved on the joint pin shaft 5 extends towards the notch of the joint side groove 624 of the joint center hole 625, and the axial length of the joint center tube 626 is not more than that of the joint side groove 624. The joint internal reinforcement piece 622 and the limiting piece 623 are sleeved on the joint central tube 626. The joint cover 621 and the joint inner reinforcing sheet 622 are provided with matched control grooves 627, and the control grooves 627 extend along the hole diameter of the joint center hole 625 to form strip-shaped holes. The intra-joint reinforcing sheet 622 is further provided with an operation track groove 628, the operation track groove 628 is an arc-shaped hole, and the center of the arc-shaped hole is concentric with the joint center hole 625; the manipulating groove 627 is disposed at one side of the manipulating track groove 628 in a staggered manner.

Referring to fig. 4, a second pin 42 is inserted into the manipulation track groove 628, and the second pin 42 rotates around the joint center hole 625 along the manipulation track groove 628. One end of the second pin 42 abuts against the joint side groove 624, and the other end extends toward the plug mechanism 9. One side of the knuckle side groove 624 protrudes radially outward along the knuckle center hole 625 to form an outward protruding groove 629, and the outward protruding groove 629 communicates with the knuckle side groove 624. The spacing piece 623 comprises an outer spacing part 6231 embedded in the outer convex groove 629, an inner ring part 6232 sleeved in the joint central tube 626 and a spacing connecting part 6233 connected with the outer spacing part 6231 and the inner ring part 6232. The outer wall of the inner ring portion 6232 and one side of the limit connecting portion 6233 are tangent to one side of the control groove 627 close to the joint central tube 626, and the structure considerably prolongs the axial length of one side of the control inner hole. The position-limiting connection portion 6233 and the outer position-limiting portion 6231 are located on a side of the manipulation groove 627 away from the manipulation track groove 628.

Referring to fig. 4, a control connection portion 63 for connecting with the handle connecting tube 3 is provided around the joint cover 621. When the second pin 42 rotates to abut against one side of the control track groove 628 close to the control groove 627, the control connection portion 63 drives the handle connecting tube 3 to be in the retracted state, one end of the control track groove 628 abutting against the second pin 42 in this state is set as a control retracted end 6281, and the other end is set as a control extended end 6282.

Referring to fig. 5, the manipulating connecting portion 63 is inwardly recessed with a moving groove 631 along a direction parallel to the length direction of the manipulating groove 627, and the manipulating groove 627 and the joint center hole 625 are both communicated with the moving groove 631. The slot bottom of the moving slot 631 is provided with two protruding columns 632, and the protruding columns 632 are located on one side of the joint center hole 625 far away from the slot opening of the moving slot 631. The end face of one end of the moving member 61 is provided with a groove 611 matching with the protruding pillar 632, and an expansion member 64 for moving the moving member 61 toward the notch of the moving groove 631 is installed between the groove 611 and the protruding pillar 632, in this embodiment, the expansion member 64 is a spring.

Referring to fig. 5, the moving member 61 is provided with a moving waist hole 612 adjacent to the groove 611 for moving the joint pin 5 along the length direction of the control groove 627; the length of the moving kidney hole 612 is equal to the length of the manipulation groove 627. The moving member 61 is provided with a moving pin hole 613 at a side of the moving waist hole 612 away from the groove 611, and the moving pin hole 613 is provided with a first pin 41.

Referring to fig. 3, one end of the first pin 41 passes through the manipulation groove 627 near one side of the first rotation mechanism 7 and extends toward the plug mechanism 9.

Referring to fig. 6, the side of the joint cover 621 away from the first rotating mechanism 7 is provided with an extra-joint reinforcing sheet 65 and an outer cover 66, and the extra-joint reinforcing sheet 65 is embedded in the joint cover 621 through a ring. The knuckle external reinforcement plate 65 is provided with an external center hole corresponding to the knuckle center hole 625 and an external bar hole 651 corresponding to the manipulation groove 627.

Referring to fig. 6, a cap 51 having an outer diameter larger than the inner diameter of the joint center hole 625 is fixed to one end of the joint pin 5 connected to the operating mechanism 6; the outer cover 66 is detachably clamped to the joint cover 621 and is used for shielding the joint cap portion 51 and limiting the joint pin shaft 5 and the first pin shaft 41 to move away from the first rotating mechanism 7 along the axial direction, so that risks such as pin dropping and the like of the joint pin shaft 5 or the first pin shaft 41 are reduced.

Referring to fig. 7, the first rotating mechanism 7 includes a first rotating cover 71 and a first reinforcing sheet 72. The first rotating cover 71 is provided with a first center hole 711 concentric with the knuckle center hole 625, and a first center pipe 712 is provided on one side of the first center hole 711. The first reinforcing plate 72 is sleeved on the first central tube 712 and embedded on one side surface of the first rotating cover 71; in this embodiment, the first reinforcing piece 72 is located on one side of the first rotating cover 71 close to the operating mechanism 6, and abuts against the limiting piece 623.

The first rotating cover 71 and the first reinforcing plate 72 are provided with the same first track groove 73, and the first track groove 73 is an arc-shaped hole for the first pin shaft 41 to rotate around the first central hole 711 and is a through groove.

The first reinforcing plate 72 extends radially outward along the first central hole 711 to form a first connecting portion 74, the first connecting portion 74 is connected to one end of the first reinforcing plate 72 close to one end of the first track groove 73, and when the first pin 41 rotates to abut against the end of the first track groove 73, the first connecting portion 74 is folded relative to the operating mechanism 6, so that the end of the first track groove 73 is set as a first folded end 731, and the other end is set as a first unfolded end 732. The first connecting portion 74 is used to connect the rear leg tube 2, so as to connect the rear leg tube 2 and the foldable joint 4, and the first connecting portion 74 can be bent toward the first unfolding end 732 or another direction in order to limit the range of the rotation unfolding arc of the rear leg tube 2. In this embodiment, the first connecting portion 74 is bent away from the first opening end 732, so as to reduce the arc-shaped distance between the first connecting portion 74 and other components hinged to the joint pin 5.

Referring to fig. 7, the first track groove 73 is extended with a first extended track groove 75 along the radial direction, and the first extended track groove 75 is close to the first closing end 731 of the first track groove 73; the first extension track groove 75 is an arc-shaped hole, and the center of the arc is concentric with the first central hole 711. The first flared end 732 of the first track groove 73 has a first limiting hole 76 extending radially therefrom, and the first limiting hole 76 corresponds to, and is preferably identical to, the shape of the manipulation groove 627. In the present embodiment, the first extended track groove 75 and the first limiting hole 76 are located on a side of the first track groove 73 radially outward. The second pin 42 is inserted into the first extending track groove 75.

Referring to fig. 7, a side surface of the first extending track groove 75 away from the first receiving end 731 is provided with a guide surface 77 for facilitating the first pin 41 to move from the first extending track groove 75 to the first track groove 73.

Referring to fig. 8, 9, the second rotating mechanism 8 includes a second rotating cover 81 and a second reinforcing sheet 82. The second rotating cover 81 is provided with a second center hole 811 coaxial with the joint center hole 625, and a second center pipe 812 is provided on one side of the second center hole 811. The second reinforcing plate 82 is sleeved on the second central tube 812 and embedded in one side surface of the second rotating cover 81; the second reinforcing piece 82 is located on the side of the second rotating cover 81 close to the operating mechanism 6 in this embodiment, and abuts against the first rotating cover 71.

The second reinforcement piece 82 extends radially outward along the second center hole 811 with a second coupling portion 83, and the second coupling portion 83 is used for coupling with the front leg tube 1. The second reinforcing plate 82 is provided with a second track groove 821 and a second pin hole 822, and the second track groove 821 is an arc-shaped hole for the first pin shaft 41 to rotate around the second center hole 811. The second pin hole 822 is matched with one end of the second pin shaft 42 far away from the control mechanism 6, and is used for penetrating the second pin shaft 42. The second pin hole 822 is located at one end of the second track groove 821. In this embodiment, the second connecting portion 83 is located outside one end of the second track groove 821 close to the second pin hole 822.

Referring to fig. 8, when the first pin 41 rotates to abut against the side of the second track groove 821 close to the second pin hole 822, the second connecting portion 83 drives the front leg tube 1 to rotate to a retracted state relative to the operating mechanism 6, and one end of the second track groove 821 abutting against the first pin 41 in this state is set as a second retracted end 8211, whereas the other end is set as a second extended end 8212.

The second track groove 821 is radially provided with a locking groove 84 and a second limiting hole 85. The slot 84 is close to the second retracted end 8211, and is spaced from the second retracted end 8211 by a diameter distance of the first pin 41, that is, the first pin 41 does not contact the slot 84 when abutting against the second retracted end 8211; the first pin 41 needs to move a certain distance from the second retracted end 8211 to the second expanded end 8212 before entering the slot 84. Therefore, when the foldable frame is folded, the arm lock mechanism is often arranged between the front foot tube 1 and the rear foot tube 2, the arm lock mechanism needs to be unlocked before the foldable frame is unfolded, and the front foot tube 1 and the rear foot tube 2 after being unlocked are separated by a certain distance. Therefore, the clamping groove 84 is arranged at the position not abutting against the second folding end 8211, so that the first pin shaft 41 can be controlled to move to the clamping groove 84 quickly when the unfolding operation is performed conveniently, the front pin tube 1 does not need to be moved towards the rear pin tube 2 manually, the first pin shaft 41 is aligned to the clamping groove 84, and the unfolding operation efficiency can be improved.

A second limiting aperture 85 is proximate the second flared end 8212. the second limiting aperture 85 is in mating correspondence with the actuation slot 627, preferably the second limiting aperture 85 is identical to the actuation slot 627. The aperture of the locking slot 84 and the width of the second limiting hole 85 are both matched with the first pin shaft 41. When the first pin shaft 41 is disposed through the second track groove 821, one end of the first pin shaft 41 abuts against the second rotating cover 81. The second rotating cover 81 can limit the first pin shaft 41 to move along the axial direction of the first pin shaft, so that the second pin shaft 42 is prevented from being out of alignment.

Referring to fig. 10 and 11, when the handle connecting tube 3 is turned over to the foldable joint 4, the operation track groove 628 is located on the side of the joint spool away from the rear foot tube 2; in other words, in this embodiment, when the foldable frame is folded from the unfolded state, the handle connecting tube 3 is turned over toward the front leg and folded toward the front. The front leg tube 1 and the corresponding wheel 11 of the foldable frame folded in this way rotate towards the rear side of the rear leg tube 2 until the wheel 11 of the front leg tube 1 is partially positioned at the rear side of the rear leg tube 2; at the moment, the wheels 11 of the front foot tubes 1 and the wheels 11 of the rear foot tubes 2 both support the foldable frame against the ground, so that the foldable frame can be conveniently stored; and the front leg tube 1 and the back leg tube 2 are relatively jointed, the push-pull tube 31 after being turned over can be abutted against the front side of the back leg tube 2, and the occupied space is relatively reduced after the front leg tube 1, the back leg tube 2 and the handle connecting tube 3 are folded.

Referring to fig. 11, the movement track of the second pin 42 sliding from one end of the manipulation track groove 628 to the other end around the joint pin 5 is an arc, which is a manipulation arc; the motion track of the first pin shaft 41 sliding from one end of the first track groove 73 to the other end around the joint pin shaft 5 is an arc, and the radian is a first radian; the motion track of the second pin shaft 42 sliding from one end of the first extension track groove 75 to the other end around the joint pin shaft 5 is an arc, and the radian is a first extension radian; the movement locus of the first pin 41 sliding from one end of the second locus groove 821 to the other end around the joint pin 5 is an arc, and the arc is a second arc.

In this embodiment, the control radian is equal to the second radian. The first radian is greater than the second radian; the first extension radian is not larger than the radian difference between the first radian and the second radian, and the first extension radian is equal to the radian difference between the first radian and the second radian in the embodiment, namely matched with the radian of the first connecting part 74 which is unfolded relative to the second connecting part 83.

Referring to fig. 2 and 3, the intra-articular reinforcing piece 622, the limiting piece 623, the extra-articular reinforcing piece 65, the first reinforcing piece 72 and the second reinforcing piece 82 are all made of a material harder than the articular cover 621, so as to improve the use strength of the foldable joint 4 and prolong the service life. In this embodiment, the joint cover 621, the ring, the outer cover 66, the first rotating cover, and the second rotating cover are injection-molded plastic parts, and the joint inner reinforcing sheet 622, the limiting sheet 623, the joint outer reinforcing sheet 65, the first reinforcing sheet 72, and the second reinforcing sheet 82 are all iron sheets. The control groove 627, the first limiting hole 76 and the second limiting hole 85 are gradually reduced in width from one end to the other end in the length direction, and in the embodiment, the control groove 627, the first limiting hole 76 and the second limiting hole 85 are gradually reduced from one end close to the axis of the joint pin shaft 5 to the other end.

Referring to fig. 12, when the control groove 627, the first limiting hole 76 and the second limiting hole 85 are coaxially disposed, the handle connecting tube 3, the front leg tube 1 and the rear leg tube 2 are all in an unfolded use state, at this time, the first pin shaft 41 is under the action of the telescopic member 64, and the moving member 61 drives the first pin shaft 41 to move from one end close to the joint pin shaft 5 to the other end along the control groove 627. In addition, in the moving process, the first pin shaft 41 is gradually attached to the inner wall of the control groove 627, the inner wall of the first limiting hole 76 and the inner wall of the second limiting hole 85, so that the shaking condition of the control connecting part 63, the first connecting part 74 and the second connecting part 83 relative to the joint pin shaft 5 is reduced, and the unfolding state and the structure stability of the handle connecting pipe 3, the front foot pipe 1 and the rear foot pipe 2 are improved.

Referring to fig. 12, at least one of the operating mechanism 6, the first rotating mechanism 7 or the second rotating mechanism 8 is provided with a limiting component extending towards the plug mechanism 9 for limiting the rotation of the plug mechanism 9. The limiting assembly comprises a first limiting member 78 and a second limiting member 421, and the first limiting member 78 and the second limiting member 421 are both arranged in the reversing rotation hole 94 in a penetrating manner; the maximum radian formed by the rotation of the first limiting member 78 and the second limiting member 421 around the joint pin 5 is not greater than the reversing rotation hole 94. In this embodiment, the first limiting member 78 is a limiting member fixed to the first reinforcing plate 72, and the second limiting member 421 is an end portion of the second pin 42 passing through the second pin hole 822. The second limiting member 421 is located on one side of the first reinforcing plate 72 close to the first limiting hole 76. The second reinforcing plate 82 and the second rotating cover 81 are provided with a limiting rotation hole 86 for the second limiting member 421 to pass through the second rotating mechanism 8.

The limiting assembly can limit the rotation range of the plug mechanism 9 relative to the joint pin shaft 5, so that the rotation angle can be adjusted according to requirements, the stability of the rotated angle can be kept, and the use safety is improved. After the plug mechanism 9 is adjusted by rotation, at least one of the first limiting member 78 and the second limiting member 421 abuts against one end of the reversing rotation hole 94 to limit the rotation of the reversing rotation hole 94, which affects the safety of use.

Referring to fig. 12 and 13, the plug mechanism 9 includes a plug cover 91 hinged to the joint pin 5 and plug reinforcing pieces 92, the plug reinforcing pieces 92 are embedded in the plug cover 91, and the plug cover 91 extends outward in an axial direction perpendicular to the joint pin 5 to form a plug connecting portion 93. For example, the plug reinforcing tabs 92 may be iron tabs, the plug cover 91 is injection molded, and the plug reinforcing tabs 92 are embedded therein when the plug cover is injection molded. In this embodiment, through plug mechanism 9, but external functional mechanism such as quick assembly disassembly hand-basket, seat pocket improve the availability factor of collapsible frame.

Referring to fig. 12 and 13, the plug cover 91 and the plug reinforcing plate 92 are provided with a reversing rotation hole 94 for the rotation of the stopper assembly about the joint pin 5. The reversing rotating hole 94 is an arc-shaped hole, and the hole width of the reversing rotating hole 94 is consistent with the length of the control groove 627. The radian of the movement track of the reversing rotating hole 94 rotating from one end to the other end around the joint pin 5 is a reversing radian equal to the maximum arc-shaped distance between the first limiting member 78 and the second limiting member 421 around the joint pin 5. Therefore, when the plug mechanism 9 needs to perform a reversing rotation, the first limiting member 78 and the second limiting member 421 need to rotate close to each other until the arc-shaped distance between the two members is smaller than the reversing arc.

Referring to fig. 13 and 14, when the front leg tube 1 and the rear leg tube 2 are relatively unfolded, the plug mechanism 9 can only be in one same state, and keeps relatively fixed, so that the stability of inserting external functional mechanisms such as a basket or a seat pocket is improved, and the use safety is improved. The limiting rotation hole 86 is an arc-shaped hole, and the radian of the running track of the limiting rotation hole 86 rotating from one end to the other end around the joint pin shaft 5 is a limiting radian; the limiting radian is smaller than the reversing radian, that is, the sliding range of the second limiting member 421 along the limiting rotation hole 86 is smaller than the maximum radian interval of the first limiting member 78 relative to the second limiting member 421.

Referring to fig. 10 and 11, when the front leg tube and the rear leg tube are opposite to each other, so that the foldable frame of the present invention can be pushed, pulled, or stored for use, the plug mechanism 9 can be rotated around the joint pin 5, so that the plug connecting portion 93 faces different directions relative to the handle connecting tube 3, thereby realizing that the external functional mechanism is located at the rear side or the front side of the foldable frame, improving the storage efficiency, and eliminating the need of separately storing the external functional mechanism or the foldable frame. Specifically, for example, the external functional mechanism is a seat pocket, and when the plug connecting part 93 rotates to be close to the handle connecting pipe 3, the seat pocket can rotate towards the rear side of the foldable frame for storage, and is suitable for being unfolded, and the seat pocket faces a person pushing a cart; when the plug connecting part 93 rotates to deviate from the handle connecting pipe 3, the seat pocket can rotate towards the front side of the foldable frame for storage, and the seat pocket is suitable for people who lean against the cart in the unfolding state.

Referring to fig. 15, a handle pin hole 32 corresponding to the moving waist hole 612 and a handle waist hole 33 corresponding to the moving pin hole 613 are provided at one end of the handle connecting pipe 3 remote from the push-pull pipe 31. During assembly, the handle connecting pipe 3 is inserted into the moving piece 61, so that the handle pin hole 32, the moving waist hole 612 and the joint center hole 625 are correspondingly matched and provided for the joint pin shaft 5 to penetrate through; meanwhile, the handle waist hole 33, the moving pin hole 613 and the control groove 627 are correspondingly matched, so that the first pin shaft 41 can penetrate through the control groove.

Referring to fig. 5 and 15, a sliding member 34 is disposed in an end portion of the handlebar connecting pipe 3 close to the moving member 61 and can push the moving member 61 to move, and one end of the sliding member 34 abuts against the moving member 61. A through hole 341 is blocked at one side of the sliding piece 34 close to the moving piece 61, and the through hole 341 axially intersects with the axial direction of the handle connecting pipe 3; in this embodiment, the through hole 341 is perpendicular to the handle connecting tube 3; the handle connecting pipe 3 is provided with a locking hole 35 corresponding to the through hole 341. The through hole 341 is provided with a lock body 36 and a lock block 37; a compression spring 38 for moving the lock piece 37 toward the lock hole 35 in the axial direction of the through hole 341 with respect to the lock body 36 is provided between the lock piece 37 and the lock body 36, and one side of the lock piece 37 is engaged with the lock hole 35.

The side of the locking block 37 close to the locking hole 35 is provided with a guiding conical surface 371; the length of the guiding conical surface 371 is smaller than that of the locking hole 35 along the direction parallel to the axial direction of the handle connecting tube 3. The side wall of the sliding piece 34 is provided with a sliding waist hole 342 communicated with the through hole 341, and the length direction of the sliding waist hole 342 is parallel to the axial direction of the through hole 341. The lock body 36 has an inclined hole 361 communicating with the through hole 341, and the inclined hole 361 is inclined in the longitudinal direction with respect to the sliding hole 342, and has one end close to the moving member 61 and the other end distant from the moving member 61. A pin 372 is installed on the side of the lock block 37 far from the lock hole 35 and passes through the inclined hole 361 and the sliding waist hole 342. The pin 372 has a diameter matching the angled slot hole 361 and is smaller than the slip kidney hole 342. When the lock block 37 is clamped in the lock hole 35 under the action of the compression spring 38, the pin 372 abuts against one end of the inclined bar hole 361 far away from the moving part 61.

When the foldable device is folded from the unfolded state, an operator presses the lock hole 35 to enable the lock block 37 to be separated from the lock hole 35; under the guiding action of the pin rod 372, the locking piece 37, the locking piece and the sliding piece 34 simultaneously move continuously along the inclined bar hole 361, so that the sliding piece 34 applies force to the moving piece 61, and the moving piece 61 drives the first pin shaft 41 to move towards the bottom of the moving groove 631, so that the first pin shaft 41 is separated from the control groove 627, the first limiting hole 76 and the second limiting hole 85, and the first pin shaft 41 can rotate along the control track groove 628.

Referring to fig. 1 and 10, an arm lock mechanism 10 capable of being unlocked and connected to the front leg tube 1 and the rear leg tube 2 may be further added between the front leg tube 1 and the rear leg tube 2 for keeping the front leg tube 1 and the rear leg tube 2 connected in a relatively folded state, so as to reduce the occurrence of unfolding and influence on the folding requirements.

Referring to fig. 16, the arm lock mechanism 10 in this embodiment includes a fixed lock housing 101, a movable lock 102, and a catch 103. The fixed lock seat 101 is fixedly installed on the rear foot tube 2, and the movable lock piece 102 is hinged on the outer side surface of the fixed lock seat 101 through a lock pin 104; a torsion spring 105 for keeping the movable latch 102 driven in one direction around the latch pin 104 is provided between the movable latch 102 and the fixed latch holder 101. The movable locking piece 102 is provided with a locking piece center hole 1021 for the locking pin 104 to penetrate; a locking piece fixing groove 1024 for the torsion spring 105 to be sleeved and a first clamping block 1022 and a second clamping block 1023 for limiting the rotation range of the torsion spring 105 are arranged on one side of the movable locking piece 102 close to the fixed locking seat 101; the first fixture block 1022 and the second fixture block 1023 are centrosymmetric with the locking piece central hole 1021 as an axis; the locking piece fixing groove 1024 is adjacent to the second latch 1023. The fixed lock base 101 is provided with a lock base center hole 1013 through which the lock pin 104 is inserted. One side of the fixed lock seat 101 close to the movable locking piece 102 is provided with a first arc-shaped sliding groove 1011 matching with the first fixture block 1022 and a second arc-shaped sliding groove 1012 matching with the second fixture block 1023, and the first arc-shaped sliding groove 1011 and the second arc-shaped sliding groove 1012 are coaxial with the lock seat central hole 1013. The first and second

arcuate runners

1011, 1012 rotate about the same range about the central bore 1013 of the lock housing. The outside card of torsional spring 105 is located latch fitting fixed slot 1024, and inboard one end fixed connection is in the one side that fixed lock seat 101 is close to first arc spout 1011.

The movable locking piece 102 is provided with a locking piece 1025 towards the front leg tube 1 at a side of the central hole of the fastener 103 away from the second locking block 1023, and a locking groove 1026 recessed downwards is formed in the upper portion of the locking piece 1025. The locking slot 1026 mates with the fastener 103.

Referring to fig. 16 and 17, when the front leg tube 1 rotates around the joint pin 5 to close the rear leg tube 2, the control handle connecting tube 3 can also be positioned above the folding mechanism. If the handle connecting pipe 3 can be used as a push-pull handle at the moment, the whole foldable frame is pushed and pulled to be similar to a luggage case, the movable carrying is realized, the moving efficiency is improved, and the movable carrying difficulty of the foldable frame is reduced. In the using state, the first foldable end 731 and the second foldable end 8211 are coaxial; the operation groove 627 is coaxial with the second limiting groove and is limited to the first track groove 73, so that when the handle connecting pipe 3 rotates to the upper side of the foldable joint 4 in a state that the second reinforcing plate 82 is locked by the arm lock mechanism 10 relative to the first reinforcing plate 72, the first pin shaft 41 just abuts against the second unfolding end 8212 and the operation track groove 628, and is limited by the first track groove 73 and cannot move away from the second track groove 821 towards the second limiting hole 85; meanwhile, the second pin shaft 42 abuts against the control receiving end 6281 and the second reinforcing piece 82 to limit the handle connecting pipe 3 to continue to turn towards the rear side of the rear foot pipe 2, so that the handle connecting pipe 3 can stably drive the foldable frame to move.

The implementation principle of the foldable frame in the embodiment of the application is as follows:

referring to fig. 18 and 19, when the foldable frame is folded from the unfolded state, the lock block 37 is pressed first and the handle connecting tube 3 is pushed toward the moving slot 631, so that the first pin 41 is disengaged from the operating slot 627 and enters the operating track slot 628, the first pin 41 is disengaged from the first limiting hole 76 and enters the first track slot 73, the second pin 42 is located in the first extending track slot 75, and the first pin 41 is disengaged from the second limiting hole 85 and enters the second track slot 821.

Then, the handle connecting tube 3 is turned over toward the front leg tube 1 by rotating the handle, the first pin shaft 41 rotates toward the first retracting end 731 along the first opening end 732 of the first track groove 73, the first pin shaft 41 rotates along the second opening end 8212 of the second track groove 821 until the first pin shaft 41 abuts against the second retracting end 8211, and the second pin shaft 42 rotates along the control opening end 6282 of the control track groove 628 until the second pin shaft 42 abuts against the control retracting end 6281.

Then, the handle connecting tube 3 is continuously controlled to drive the front leg tube 1, the operating mechanism 6, the first pin shaft 41 and the second pin shaft 42 to approach the rear leg tube 2, and at the same time, the first pin shaft 41 is continuously rotated toward the first folding end 731 along the first unfolding end 732 of the first track groove 73, and the first pin shaft 41 drives the second rotating mechanism 8 and the front leg tube 1 to rotate until the first pin shaft 41 abuts against the first folding end 731, that is, the front leg tube 1 abuts against the rear leg tube 2, and the folding is completed.

Referring to fig. 16 and 17, when the foldable frame is unfolded from the folded state, the handle connecting tube 3 is pulled away from the moving groove 631, and the handle connecting tube 3 is rotated to coaxially arrange the locking groove 84 and the manipulating groove 627, the first pin 41 slides from one end of the manipulating groove 627 close to the joint center tube 626 to the other end, the first pin 41 moves from the first track groove 73 to the first extended track groove 75, and the first pin 41 moves from the second track groove 821 to the locking groove 84.

Then, the handle connecting tube 3 is rotated continuously, so that the front leg tube 1 and the second rotating mechanism 8 are rotated away from the rear leg tube 2, and meanwhile, the second pin shaft 42 is rotated from the manipulation retracting end 6281 toward the manipulation extending end 6282 along the manipulation track groove 628 until the first pin shaft 41 abuts against one side of the first extending track groove 75 away from the first retracting end 731; the first pin shaft 41 moves from the first extending track groove 75 to the first track groove 73 along the guide surface 77, meanwhile, the first pin shaft 41 is separated from the clamping groove 84, and the first pin shaft 41 slides from one end of the control groove 627 far away from the joint center tube 626 to the other end; the first deployment end 732 and the second deployment end 8212 are disposed coaxially, and the first limiting aperture 76 and the second limiting aperture 85 are disposed coaxially. At this time, the wheels 11 of the front foot tubes 1 and the vehicle of the rear foot tubes 2 are separated to support the foldable frame, so that the foldable frame can be stably placed on the ground.

Then, the handle connecting tube 3 is rotated continuously, so that the second pin shaft 42 is rotated continuously along the manipulation track groove 628 towards the manipulation unfolding end 6282, and simultaneously the handle connecting tube 3 is turned over towards the direction departing from the front foot tube 1; until the second pin 42 abuts against the control opening end 6282, the control groove 627 is coaxially disposed with the second limiting hole 85, and the handle connecting tube 3 is rotated to the upper side of the foldable joint 4.

Finally, under the action of the telescopic member 64, the moving member 61 drives the first pin shaft 41 to move toward the notch of the moving groove 631, so that the first pin shaft 41 is limited at one end of the control groove 627 far from the joint center tube 626, the first pin shaft 41 is located in the first limiting hole 76 and the second limiting hole 85, and meanwhile, the locking block 37 is correspondingly clamped in the locking hole 35, and the expansion is completed.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A foldable joint, comprising: comprises a joint pin shaft (5), an operation mechanism (6), a first rotating mechanism (7), a second rotating mechanism (8) and a plug mechanism (9); the joint pin shaft (5) penetrates through the control mechanism (6), the first rotating mechanism (7) and the second rotating mechanism (8), and the first rotating mechanism (7), the second rotating mechanism (8) and the plug mechanism (9) can rotate around the joint pin shaft (5);

the control mechanism (6) is provided with a control groove (627) for switching the joint pin shaft (5) in a staggered manner, a first pin shaft (41) parallel to the joint pin shaft (5) is installed in the control groove (627), and the control mechanism (6) is used for driving the first pin shaft (41) to rotate around the joint pin shaft (5); the control mechanism (6) is provided with a control connecting part (63);

the first rotating mechanism (7) is provided with a first track groove (73) for the first pin shaft (41) to slide around the joint pin shaft (5); the motion track of the first pin shaft (41) which slides from one end of the first track groove (73) to the other end of the first pin shaft (5) around the joint pin shaft is an arc, and the radian is a first radian; the first rotating mechanism (7) is provided with a first connecting part (74);

the second rotating mechanism (8) is provided with a second track groove (821) for the first pin shaft (41) to slide around the joint pin shaft (5); the motion track of the first pin shaft (41) which slides from one end of the second track groove (821) to the other end of the first pin shaft (41) around the joint pin shaft (5) is an arc, and the radian is a second radian; the second rotating mechanism (8) is provided with a second connecting part (83);

the first arc is greater than the second arc.

2. The foldable joint of claim 1, wherein: the second rotating mechanism (8) is provided with a second pin shaft (42) which is staggered with the second track groove (821), and the second pin shaft (42) is parallel to the joint pin shaft (5);

the first rotating mechanism (7) is provided with a first extending track groove (75) for the second pin shaft (42) to slide around the joint pin shaft (5); the motion track of the second pin shaft (42) which slides from one end of the first extension track groove (75) to the other end of the first extension track groove is an arc around the joint pin shaft (5), and the radian is a first extension radian; the first extension radian is not greater than a radian difference between the first radian and the second radian.

3. The foldable joint of claim 2, wherein: the control groove (627) radially extends along the joint pin shaft (5) to form a strip-shaped groove; the control connecting part (63) is close to the control groove (627);

the first extending track groove (75) and the first track groove (73) are staggered along the radial direction of the joint pin shaft; the first extending track grooves (75) are communicated, one end of each first extending track groove (75) is abutted against one end of each first track groove (73), and the other end of each first extending track groove (75) extends towards the other end of each first track groove (73); the first connecting part (74) is close to one end of the first track groove (73) which is abutted against the first extending track groove (75);

one end of the second track groove (821) radially extends along the joint pin shaft (5) to form a clamping groove (84) matched with the outer diameter of the first pin shaft (41), and the clamping groove (84) is used for limiting the first pin shaft (41) to slide along the second track groove (821); when the second rotating mechanism (8) moves to the position that the first pin shaft (41) abuts against the clamping groove (84), the first pin shaft (41) just moves from the first track groove (73) to the first extending track groove (75), and the control groove (627) moves from one end to the other end; the second connecting portion (83) is close to the catching groove (84).

4. The foldable joint of claim 3, wherein: one end, far away from the first connecting portion (74), of the first extending track groove (75) is provided with a guide surface (77) for the first pin shaft (41) to move from the first extending track groove (75) to the first track groove (73).

5. The foldable joint of claim 3, wherein: a first limiting hole (76) correspondingly matched with the control groove (627) extends from one end, far away from the first connecting part (74), of the first track groove (73); and a second limiting hole (85) correspondingly matched with the control groove (627) extends from one end, away from the clamping groove (84), of the second track groove (821).

6. The foldable joint of claim 3, wherein: the width of the control groove (627) is gradually reduced from one end, which drives the first pin shaft (41) to slide around the first track groove (73), to the other end.

7. The foldable joint of claim 3, wherein: the control mechanism (6) comprises a moving part (61) and a rotating part (62); the control connecting part (63) is fixed on the rotating part (62); the control groove (627) is positioned on the rotating piece (62); a telescopic piece (64) for driving the moving piece (61) to be far away from the rotating piece (62) is arranged between the moving piece (61) and the control connecting part (63);

one end of the first pin shaft (41) penetrates through the control groove (627) and is connected to the moving piece (61);

the moving piece (61) is provided with a moving waist hole (612) for the joint pin shaft (5) to move along the length direction of the control groove (627); the length of the moving kidney hole (612) is matched with that of the control groove (627).

8. The foldable joint of claim 2, wherein: the control mechanism (6) is provided with a control track groove (628) for the second pin shaft (42) to slide around the joint pin shaft (5); the control track groove (628) is staggered with the control groove (627);

the first track groove (73) and the first extending track groove (75) are through grooves, the control track groove (628) and the control groove (627) are through grooves, or the second track groove (821) is a through groove.

9. The foldable joint of claim 1, wherein: the plug mechanism (9) is positioned at one side of the control mechanism (6); and at least one of the control mechanism (6), the first rotating mechanism (7) or the second rotating mechanism (8) is provided with a limiting component for limiting the rotation of the plug mechanism (9).

10. The foldable joint of claim 9, wherein: the plug mechanism (9) is provided with a reversing rotating hole (94) for the limiting assembly to rotate around the joint pin shaft (5); the limiting assembly comprises a first limiting piece (78) and a second limiting piece (421), and the first limiting piece (78) and the second limiting piece (421) are arranged in the reversing rotating hole (94) in a penetrating manner; the maximum radian formed by the rotation of the first limiting piece (78) and the second limiting piece (421) around the joint pin shaft (5) is not larger than the reversing rotation hole (94).

11. A foldable frame, characterized in that: comprises two groups of side frames; each side frame comprises a front foot tube (1), a rear foot tube (2), a handle connecting tube (3) and the foldable joint (4) of any one of claims 1-8; the foldable joint (4) is used for hinging the front foot tube (1), the rear foot tube (2) and the handle connecting tube (3);

one of the front foot tube (1) and the rear foot tube (2) is connected with the first connecting part (74), and the other one is connected with the second connecting part (83); the handle connecting pipe (3) is connected with the control connecting part (63).

12. The folding frame of claim 11, wherein: the first rotating mechanism (7) is positioned between the control mechanism (6) and the second rotating mechanism (8); the rear foot tube (2) is connected to the first connecting part (74), and the front foot tube (1) is connected to the second connecting part (83);

the distance between the two front foot tubes (1), the distance between the two rear foot tubes (2) and the distance between the two handle connecting tubes (3) are sequentially increased.

13. The foldable frame of claim 11, wherein: an arm lock mechanism (10) used for limiting the front foot tube (1) to be unfolded relative to the rear foot tube (2) is arranged between the front foot tube (1) and the rear foot tube (2).