A movable joint

Abstract

The present invention belongs to the technical field of baby stroller accessories. Specifically, the present invention relates to a movable joint, comprising a connecting member, a second connecting member, and an unlocking device. The first connecting member is provided with a socket and a slot. The socket is located at one end of the first connecting member and is used to insert the second connecting member. The slot is located on the side wall of the first connecting member and is connected to the socket. The side wall of the second connecting member is provided with a block, which slides with the second connecting member and is used to engage with the slot to lock the second connecting member. The unlocking device is installed on the first connecting member and is located outside the slot. It is used to unlock the second connecting member when rotating. When the present invention is applied to the connection of a child stroller seat, the child seat can be adjusted with less force, which is convenient for use by the elderly and women with children.

Description

Technical Field

[0001] The present invention belongs to the technical field of baby carriage accessories, and in particular, relates to a movable joint. Background Art

[0002] A stroller is a hand-held stroller for children to ride in. Generally speaking, the child seat is fixed to the body of the stroller and cannot move.

[0003] With the diversification of strollers, some existing strollers offer adjustable child seat orientations. Specifically, the child seat can be adjusted so that the child faces the push-pull rod or faces away from the push-pull rod. To adjust the orientation of the child seat, existing strollers typically use a push-pull button to lock or unlock the child seat. For example, the patent application document with application number 201720459416.9, application date April 27, 2017, and invention name "A child stroller with a rotatable seat" discloses a child stroller with a rotatable seat. Specifically, when adjusting the child seat, just push the locking piece downward (i.e., push the partition) so that the locking piece moves downward as a whole, and the first gear moves downward with it until it is completely disengaged from the first tooth groove. At this time, the connecting mechanism is released, and the rotating seat can rotate 360 ​​degrees around the Y-axis relative to the connecting seat, that is, the seat can rotate 360 ​​degrees around the Y-axis relative to the frame. When it rotates to the required angle, the partition is released. Under the action of the first spring, the locking piece moves upward as a whole, and the first gear engages with the first tooth groove again. The seat is locked at this relative angle and cannot rotate relative to the frame.

[0004] Although existing strollers with adjustable seats can adjust the direction of the child seat to a certain extent, their adjustment devices have complex structures. When adjusting the seat direction, the seat needs to be disassembled, which is complicated to operate and inconvenient for women and the elderly. During operation, the stroller may easily move sideways or horizontally, which may cause danger. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides a movable joint, and its technical solution is as follows:

[0006] A movable joint includes a first connecting member, a second connecting member and an unlocking device, wherein the first connecting member is provided with a socket and a slot, the socket is located at one end of the first connecting member and is used to accommodate the insertion of the second connecting member, and the slot is located on the side wall of the first connecting member and is communicated with the socket; a card block is provided on the side wall of the second connecting member, and the card block slides with the second connecting member and is used to be connected with the slot to lock the second connecting member; the unlocking device is installed on the first connecting member and is located on the outside of the slot, and is used to release the lock of the second connecting member when rotating.

[0007] As for the movable joint mentioned above, it is further preferred that: the unlocking device includes a connecting sleeve and a knob; the connecting sleeve is installed on the first connecting member; the knob is movably connected to the connecting sleeve; an unlocking portion is provided on the knob, the unlocking portion protrudes from the end face of the knob, one end is connected to the knob, and the other end is a free end that cooperates with the blocking block; along the circumferential direction around the axis of the knob, the free end of the blocking block gradually extends away from the knob.

[0008] As for the movable joint mentioned above, it is further preferred that: the unlocking device further includes a pin, one end of the pin is fixedly connected to the connecting sleeve, and the other end is movably connected to the knob.

[0009] As for the movable joint mentioned above, it is further preferred that: an opening is provided on the top of the connecting sleeve, and the opening is clearance-fitted or transition-fitted with the second connecting piece.

[0010] As for the movable joint mentioned above, it is further preferred that: there are multiple unlocking parts, and the multiple unlocking parts are located on the same end surface of the knob.

[0011] As for the movable joint mentioned above, it is further preferred that: the plurality of unlocking parts are distributed symmetrically around the center.

[0012] As for the movable joint mentioned above, it is further preferred that: the unlocking device also includes a return member, the return member is installed on the connecting sleeve and connected to the knob, and is used to provide return power for the knob.

[0013] As for the movable joint mentioned above, it is further preferred that: the return member is a torsion spring, the torsion spring is sleeved on the circumferential surface of the pin, one end is connected to the connecting sleeve, and the other end is connected to the knob.

[0014] As for the movable joint mentioned above, it is further preferred that: a first limiting portion and a second limiting portion are provided on the connecting sleeve, and a third limiting portion is provided on the knob; the first limiting portion and the second limiting portion are used to provide rotation space for the third limiting portion, thereby limiting the rotation angle range of the knob.

[0015] As for the movable joint mentioned above, it is further preferred that: the angle between the first limiting portion and the limiting portion ranges from 30° to 90°.

[0016] As for the movable joint mentioned above, it is further preferred that: a guide groove is provided on the first connecting member, and the guide groove is used to provide guidance for the unlocking part.

[0017] As for the movable joint mentioned above, it is further preferred that: a plurality of the clamping blocks are provided on the second connecting member, and the plurality of the clamping blocks are distributed on the side wall of the second connecting member and are located at the same height in the axial direction of the second connecting member.

[0018] As for the movable joint mentioned above, it is further preferred that: the end of the second connecting member used for plugging and cooperating with the socket is a cylindrical plug-in portion, and the multiple blocks are distributed in a circular array on the circumferential surface of the cylindrical plug-in portion, and the axis coincides with the axis of the cylindrical plug-in portion.

[0019] As for the movable joint mentioned above, it is further preferred that: the clamping block includes a clamping body and a reset member; the clamping body slides in cooperation with the second connecting member, and the reset member is installed between the second connecting member and the clamping body to provide power for resetting the clamping body.

[0020] As for the movable joint mentioned above, it is further preferred that: a clamping foot is provided on the clamping body, and the clamping foot is clamped and connected to the second connecting member to limit the reset stroke of the clamping body.

[0021] As for the movable joint mentioned above, it is further preferred that: a matching portion is provided on the engaging body, and the matching portion is used to match with the unlocking device.

[0022] As for the movable joint mentioned above, it is further preferred that: the reset member is any one of a rubber block, a compression spring, and a leaf spring.

[0023] As for the movable joint mentioned above, it is further preferred that: a bearing end is provided at the bottom of the socket, and the bearing end is used to bear the second connecting member.

[0024] As for the movable joint mentioned above, it is further preferred that: the cross-section of the socket is circular, and the diameter is larger than the cross-sectional outer contour diameter of the columnar plug-in portion; a plurality of limit strips are provided above the end face of the load-bearing end, and the plurality of limit strips are distributed in a circular array, and the axis coincides with the axis of the socket, and the limit strips are used to limit the radial displacement of the columnar plug-in portion.

[0025] As for the movable joint mentioned above, it is further preferred that: an anti-slip sleeve is provided on the side wall of the knob, and a sealing cover is provided on the end of the knob.

[0026] As for the movable joint mentioned above, it is further preferred that: the anti-slip sleeve is snap-connected to the knob, and the sealing cover is snap-connected to the anti-slip sleeve.

[0027] As for the movable joint mentioned above, it is further preferred that: the anti-slip cover is provided with anti-slip lines.

[0028] As for the movable joint mentioned above, it is further preferred that: the material of the anti-slip cover is any one of plastic, rubber, and thermoplastic elastomer.

[0029] As for the movable joint mentioned above, it is further preferred that: the material of the sealing cover is any one of plastic, rubber, and thermoplastic elastomer.

[0030] Analysis shows that, compared with the prior art, the advantages and beneficial effects of the present invention are:

[0031] The movable joint provided by the present invention is unlocked by rotating the unlocking device. Compared with the push-pull unlocking, the locking is achieved by relying on the cooperation of the structure itself, while the unlocking can be achieved with a relatively small force, and the force is only applied to the structure at the cooperation point when unlocking. When applied to the connection of the child stroller seat, the child seat can be adjusted with a relatively small force, which is convenient for the elderly and women to use with children. At the same time, the movable joint of the present invention is not limited to the application of child stroller seats, but can also be used as a universal interface for shopping carts, baby dining chairs, etc. to achieve angle adjustment and locking. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the movable joint of the present invention.

[0033] Figure 2 for Figure 1 Exploded diagram.

[0034] Figure 3 It is a structural schematic diagram of the knob of the present invention.

[0035] Figure 4 It is a structural schematic diagram of the connecting sleeve of the present invention.

[0036] Figure 5 It is a structural schematic diagram of the first connecting member of the present invention.

[0037] Figure 6 It is a structural schematic diagram of the card body of the present invention.

[0038] Figure 7 This is a schematic diagram of the structure of the unlocking device based on the sleeve and the screw.

[0039] Figure 8 This is a schematic diagram of the structure of the unlocking device based on the mounting sleeve, nut and stud.

[0040] In the figure: 1-first connecting member; 2-unlocking device; 3-second connecting member; 4-connecting sleeve; 5-pin shaft; 6-return member; 7-knob; 8-clamping body; 9-reset member; 10-sealing cover; 11-anti-slip sleeve; 12-unlocking part; 13-third limiting part; 14-first limiting part; 15-second limiting part; 16-guide groove; 17-clamping slot; 18-matching part; 19-clamping foot; 20-sleeve; 21-screw; 22-mounting sleeve; 23-nut; 24-stud. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a direct connection or an indirect connection through an intermediate component. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0043] Please refer to Figures 1 to 8 ,in, Figure 1 It is a structural schematic diagram of the movable joint of the present invention; Figure 2 for Figure 1 Exploded diagram; Figure 3 It is a structural schematic diagram of the knob of the present invention; Figure 4 It is a structural schematic diagram of the connecting sleeve of the present invention; Figure 5 is a schematic structural diagram of the first connecting member of the present invention; Figure 6 It is a structural schematic diagram of the card connection body of the present invention; Figure 7 This is a schematic diagram of the structure of the unlocking device based on the sleeve and the screw rod; Figure 8 This is a schematic diagram of the structure of the unlocking device based on the mounting sleeve, nut and stud.

[0044] like Figure 1 and Figure 2 As shown, the present invention discloses a movable joint, which mainly includes a first connecting member 1, a second connecting member 3 and an unlocking device 2. The first connecting member 1 is provided with a socket and a slot 17. The socket is located at one end of the first connecting member 1 and can accommodate the insertion of the second connecting member 3. The slot 17 is located on the side wall of the first connecting member 1 and is communicated with the socket. A card block is provided on the side wall of the second connecting member 3. The card block slides with the second connecting member 3 and can be connected with the slot 17 to lock the second connecting member 3. The unlocking device 2 is installed on the first connecting member 1, located on the outside of the slot 17, and is used to release the lock of the second connecting member 3 during rotation.

[0045] The movable joint provided by the present invention is unlocked by rotating the unlocking device 2. Compared with the push-pull unlocking, the locking is achieved by relying on the cooperation of the structure itself, while the unlocking can be achieved with a smaller force (only the force is applied to the structure at the cooperation point when unlocking, so it can be unlocked by applying a smaller force). When applied to mechanical structures, such as the connection of a child stroller seat, the child seat can be adjusted with a smaller force, which is convenient for the elderly and women to use with children. At the same time, the movable joint of the present invention is not limited to application in child stroller seats, but can also be used as a universal interface in shopping carts, baby dining chairs, etc. to complete angle adjustment and locking.

[0046] Specifically, in the present invention, the unlocking device 2 can have various forms. Figure 7 As shown, in one embodiment of the present invention, the unlocking device 2 includes a sleeve 20 and a screw 21. The sleeve 20 is installed at one end of the first connector 1 where a socket is provided. The sleeve 20 is provided with an internal thread, and the screw 21 is threadedly connected to the internal thread. When the first connector 1 and the second connector 3 are in a locked state, the block on the second connector 3 is stuck in the slot 17 of the first connector 1, thereby preventing the second connector 3 from rotating in the first connector 1. When the second connector 3 needs to be unlocked, the screw 21 is rotated, and the screw 21 extends into the first connector 1 through threaded engagement, thereby pressing the block and pushing the block out of the slot 17 to achieve the purpose of unlocking the second connector 3.

[0047] like Figure 8 As shown, in another embodiment of the present invention, the unlocking device 2 includes a mounting sleeve 22, a nut 23, and a stud 24. The mounting sleeve 22 is mounted on the end of the first connector 1 where the socket is located. The mounting sleeve 22 has a circular hole that is clearance-fitted with the stud 24. The nut 23 is mounted on the mounting sleeve 22 and is rotatably connected to the mounting sleeve 22. The stud 24 is threadedly connected to the nut 23 and extends into the circular hole, which corresponds to the slot 17. When the first connecting member 1 and the second connecting member 3 are in a locked state, the block on the second connecting member 3 is stuck in the slot 17 of the first connecting member 1; when the second connecting member 3 needs to be unlocked, the nut 23 is rotated, and the stud 24 threadedly engaged with the nut 23 extends from the circular hole into the slot 17 and presses against the surface of the block. As the stud 24 goes deeper, the block is gradually pushed out of the slot 17 by the stud 24, thereby unlocking the second connecting member 3, and the second connecting member 3 can rotate in the first connecting member 1 (rotate along the direction parallel to or overlapping with the axis of the second connecting member 3 as the rotation axis).

[0048] In the above embodiment, in order to automatically reset the unlocking device 2, a torsion spring can also be provided on the unlocking device 2. One end of the torsion spring is fixed to the first connecting member 1, and the other end is connected to the screw rod 21. When the screw rod 21 rotates, torque is gradually accumulated. When the force from the user disappears, the torsion spring relies on the accumulated torque to rotate the screw rod 21 in the opposite direction (opposite to the rotation direction during unlocking), thereby realizing automatic reset of the unlocking device 2.

[0049] In the above embodiment, although the first connecting member 1 and the second connecting member 3 can be unlocked by the rotation unlocking device 2, the screw rod 21 itself has axial movement during the rotation process, which brings certain disadvantages: the movement form is complex, the screw rod 21 used to receive external force includes both rotational movement and linear movement, and is prone to getting stuck and failing during movement; the spiral feed is also a big test for the thread, which is easy to be scratched, and there are certain requirements for torque during movement. Based on the above shortcomings, as an improvement to the present invention, Figures 1 to 6 As shown, the present invention also provides the following improved solution:

[0050] To smoothly unlock the second connector 3, the unlocking device 2 in the present invention includes a connecting sleeve 4 and a knob 7. The connecting sleeve 4 is mounted on the first connector 1, and the knob 7 is rotatably connected to the connecting sleeve 4. The knob 7 is provided with an unlocking portion 12. The unlocking portion 12 protrudes from the end surface of the knob 7, one end of which is connected to the knob 7 and the other end is a free end that engages with the block. The free end of the unlocking portion 12 gradually extends away from the knob 7 along the circumference of the knob 7. In the present invention, the free end of the unlocking portion 12 is a wedge-shaped surface along the circumference of the knob 7. When the card block is located in the card slot 17 (that is, when the first connecting member 1 and the second connecting member 3 are in a locked state), the free end of the unlocking portion 12 is close to the end of the knob 7 and fits with the card block; when the second connecting member 3 needs to be unlocked, the knob 7 is turned, and the position where the free end of the unlocking portion 12 fits with the card block changes. As the knob 7 is rotated, the unlocking portion 12 gradually presses the card block, and then pushes the card block out of the card slot 17, thereby unlocking the second connecting member 3.

[0051] In the present invention, the knob 7 and the connecting sleeve 4 are rotatably connected. The knob 7 can be clamped on the connecting sleeve 4 in the direction of its own axis, and a matching gap is left in the radial direction, thereby realizing a rotatable connection with the connecting sleeve 4 and ensuring that it does not disengage. However, the direct matching of the knob 7 and the connecting sleeve 4 will complicate the connection structure of the present invention and be inconvenient to manufacture. Therefore, the structure between the connecting sleeve 4 and the knob 7 can be simplified by adding a connecting medium. Specifically, a pin 5 is added between the connecting sleeve 4 and the knob 7, one end of the pin 5 is fixedly connected to the connecting sleeve 4, and the other end is rotatably connected to the knob 7, that is, the pin 5 is used as the rotating shaft of the knob 7, which can avoid the direct connection of the complex structure (knob 7, connecting sleeve 4) and facilitate manufacturing and assembly.

[0052] In the present invention, the inner diameter of the socket is larger than the outer diameter of the columnar plug-in portion of the second connector 3 that is used to plug into the socket, so that a radial margin can be left for the second connector 3. An opening is provided at the top of the connecting sleeve 4, and the opening is clearance-fitted or transition-fitted with the second connector 3, which can reduce the radial movable margin of the second connector 3. That is, the inner diameter of the socket is larger than the inner diameter of the opening, and the inner diameter of the opening is larger than the outer diameter of the columnar plug-in portion. In this way, the radial movable margin of the second connector 3 can be limited, and the axial movable margin of the second connector 3 can be limited (the inner diameter of the opening is smaller than the inner diameter of the socket, and when the second connector 3 is plugged into the first connector 1, the block on the second connector 3 cannot pass through the opening and can only stay in the first connector 1).

[0053] In the present invention, the card block is strip-shaped, with its length aligned with the axis of the second connector 3. To balance the forces acting on the card block, two unlocking portions 12 are provided, located on the same end face of the knob 7. During unlocking, one unlocking portion 12 presses against the top of the card block, while the other unlocking portion 12 presses against the bottom of the card block, allowing the card block to translate without tilting. In other embodiments, the card block may also be rectangular, circular, or polygonal, with three, four, or even more unlocking portions 12, distributed symmetrically around the center, thereby ensuring balanced forces and translation during displacement.

[0054] To facilitate automatic reset of the knob 7, in the present invention, the unlocking device 2 further includes a return member 6, which is mounted on the connecting sleeve 4 and connected to the knob 7, providing a return force for the knob 7. Preferably, the return member 6 is a torsion spring, which is sleeved on the circumference of the pin 5, with one end connected to the connecting sleeve 4 and the other end connected to the knob 7, providing a return force for the knob 7.

[0055] In the present invention, when the knob 7 is rotatably connected to the connecting sleeve 4, the optimal solution is not to allow the knob 7 to rotate uncontrollably, but to limit the knob 7 to an angular range. Within this angular range, when the knob 7 is rotated to the maximum value, the second connecting member 3 can be unlocked. At the initial position of the angular range, the first connecting member 1 and the second connecting member 3 are locked, thereby facilitating the user's unlocking and avoiding wasted effort. In order to achieve convenient unlocking, a first limiting portion 14 and a second limiting portion 15 are provided on the connecting sleeve 4, and a third limiting portion 13 is provided on the knob 7. The first limiting portion 14 and the second limiting portion 15 can provide rotation space for the third limiting portion 13, that is, the third limiting portion 13 can only swing between the first limiting portion 14 and the second limiting portion 15, thereby limiting the rotation angle range of the knob 7. The angle range between the first limiting portion 14 and the second limiting portion 15 can be determined according to needs. Preferably, the angle range between the first limiting portion 14 and the limiting portion is 30° to 90°, which is in line with the wrist force application habit. For example, the angle can be 30°, 40°, 50°, 60°, 70°, 80°, 90°, etc.

[0056] In the present invention, the card slot 17 is engaged with the card block. At the same time, the card slot 17 needs to reserve an accommodating space for the unlocking portion 12 of the knob 7 (when the first connecting member 1 and the second connecting member 3 are in a locked state, most of the free ends of the unlocking portion 12 do not contact the card block). Therefore, the card slot 17 needs to be opened larger, and a large range of slots will destroy the structural strength. For this reason, a guide groove 16 is provided on the first connecting member 1. The guide groove 16 is clearance-matched with the unlocking portion 12, which can provide guidance for the unlocking portion 12 and accommodate the unlocking portion 12, thereby avoiding a reduction in the structural strength of the first connecting member 1.

[0057] In the present invention, the first connector 1 and the second connector 3 can have a variety of angles when locked. For example, with the first locking position being 0°, the angles can also be ±30°, ±60°, ±90°, ±120°, ±150°, and 180° when locked. Specifically, a card block can be provided at each locking position, so a plurality of card blocks can be provided on the second connector 3, and the plurality of card blocks are distributed on the side wall of the second connector 3 and are located at the same height in the axial direction of the second connector 3. More specifically, the end of the second connector 3 used for mating with the socket is a columnar plug-in portion, and the plurality of card blocks are distributed in a circular array on the circumferential surface of the columnar plug-in portion, and the axis coincides with the axis of the columnar plug-in portion. When different card blocks are mated with the card slot 17, different locking angles of the first connector 1 and the second connector 3 can be achieved.

[0058] In the present invention, in order to improve the service life of the card block, the card block includes a card body 8 and a reset member 9. The card body 8 is slidably matched with the second connecting member 3 and is made of a hard material, such as metal or plastic, which can ensure the reliability of the clamping. The reset member 9 is installed between the second connecting member 3 and the card body 8 and is made of an elastic material or a material that can be elastically deformed, such as a rubber block, a compression spring, a leaf spring, etc., which can provide power for the reset of the card body 8. Furthermore, in order to prevent the card body 8 from detaching from the second connecting member 3, the card body 8 is provided with a clamping foot 19, which is clamped and connected to the second connecting member 3, and can limit the reset stroke of the card body 8, thereby preventing the card body 8 from falling and reducing the number of scattered parts. In order to facilitate the contact and cooperation between the unlocking part 12 and the card body 8, the card body 8 is provided with a matching part 18, which is a concave groove and fits with the unlocking part 12, thereby facilitating the sliding of the unlocking part 12 when the knob 7 is rotated.

[0059] In the present invention, the axial displacement of the second connector 3 in one direction is limited by the connecting sleeve 4, while the displacement in the other direction is limited by the load-bearing end. Specifically, the load-bearing end is provided at the bottom of the socket. The load-bearing end can support the second connector 3, thereby limiting the axial position of the second connector 3 and bearing the weight of the second connector 3. For example, when the present invention is applied to a baby stroller, the load-bearing end can bear the weight of the second connector 3, the seat, and the child, while the connecting sleeve 4 can prevent the second connector 3 from being pulled out of the stroller body.

[0060] During use, the axial movement of the second connector 3 is already limited. The socket has a circular cross-section and a diameter larger than the outer diameter of the cylindrical plug section. Therefore, the radial movement of the second connector 3 is limited solely by the connecting sleeve 4, which can easily cause the second connector 3 to wobble. To address this issue, multiple limiting bars can be provided above the end face of the load-bearing end. These bars are arranged in a circular array, with their axes coinciding with the axis of the socket. This limits the radial displacement of the cylindrical plug section and prevents wobble of the second connector 3.

[0061] Based on the above improvements, for the convenience and humanization of use, in the present invention, an anti-slip cover 11 is provided on the side wall of the knob 7. The anti-slip cover 11 is snap-connected to the knob 7, and the two are circumferentially fixed. The anti-slip cover 11 is provided with anti-slip grooves, which can prevent the user's hand from slipping when rotating the knob 7. The material of the anti-slip cover 11 can be any one of plastic, rubber, and thermoplastic elastomer, and has a certain elasticity without hurting the hand. A sealing cover 10 is provided at the end of the knob 7. The sealing cover 10 is snap-connected to the anti-slip cover 11, which can provide protection for the unlocking device 2, thereby increasing the service life of the present invention. The material of the sealing cover 10 can be any one of plastic, rubber, and thermoplastic elastomer.

[0062] like Figures 1 to 6As shown, taking the application of adjusting the orientation of a child seat in a child stroller as an example, the working process of the present invention is described in detail below:

[0063] The first connecting member 1 is connected to the vehicle frame, and the second connecting member 3 is connected to the child seat. When adjusting from a locked orientation state to another expected orientation state, for example, the locked orientation state is the child facing the push-pull rod, and the expected orientation state is the child facing away from the push-pull rod. During adjustment, the knob 7 is rotated, and the unlocking portion 12 pushes the block out of the slot 17. At this time, the second connecting member 3 is unlocked, and the second connecting member 3 rotates along its own axis. When the block does not fit the edge of the slot 17, the knob 7 can be loosened. The knob 7 is reset under the action of the return member 6 (torsion spring), and the second connecting member 3 is rotated 180°. When the block corresponding to 180° completely enters the range of the slot 17, it can automatically snap into the slot 17 under the action of the reset member 9, and the second connecting member 3 is locked. At this time, the locked state is the child facing away from the push-pull rod, and the child seat is locked and cannot be rotated.

[0064] It is understood from common technical knowledge that the present invention may be implemented by other embodiments that do not depart from its spirit or essential features. Therefore, the embodiments disclosed above are, in all respects, merely illustrative and not exclusive. All modifications within the scope of the present invention or equivalent to the scope of the present invention are intended to be encompassed by the present invention.

Claims

1. A movable joint comprising a first connecting member, a second connecting member and an unlocking device, characterized in that: The first connector is provided with a socket and a slot. The socket is located at one end of the first connector and is used to accommodate the insertion of the second connector. The slot is located on the side wall of the first connector and communicates with the socket. A clamping block is provided on the side wall of the second connecting member, and the clamping block is slidably engaged with the second connecting member and is used to be clamped and connected with the clamping slot to lock the second connecting member; The unlocking device is installed on the first connecting member and is located outside the slot, and is used to unlock the second connecting member when rotating. The block is in the shape of a strip, and its length direction is the same as the axis direction of the second connecting member. The clamping block includes a clamping body and a reset member. The clamping body is slidably matched with the second connecting member, and the reset member is installed between the second connecting member and the clamping body to provide power for resetting the clamping body. The clamping body is provided with a matching portion, which is used to match with the unlocking device. The clamping body is provided with a clamping foot, which is clamped and connected to the second connecting member to limit the reset stroke of the clamping body. The unlocking device includes a connecting sleeve and a knob. The first locking position of the first connecting member and the second connecting member is 0°, and a plurality of the clamping blocks are provided at positions corresponding to ±30°, ±60°, ±90°, ±120°, ±150°, and 180° of the second connecting member. The plurality of the clamping blocks are distributed on the side wall of the second connecting member and are located at the same height in the axial direction of the second connecting member. The end portion of the second connector for plugging into the socket is a cylindrical plug-in portion, and a plurality of the clamping blocks are distributed in a circumferential array on the circumferential surface of the cylindrical plug-in portion, with their axes coinciding with the axis of the cylindrical plug-in portion. When different clamping blocks are engaged with the clamping slots, different locking angles of the first connector and the second connector can be achieved; The connecting sleeve is mounted on the first connecting member; the knob is movably connected to the connecting sleeve; an unlocking portion is provided on the knob, the unlocking portion protruding from the end surface of the knob, one end of the unlocking portion is connected to the knob, and the other end is a free end that cooperates with the block; along the circumferential direction around the axis of the knob, the free end of the unlocking portion gradually extends away from the knob, and along the circumferential direction of the knob, the free end of the unlocking portion is a wedge-shaped surface, The first connecting member is provided with a guide groove, which is used to provide guidance for the unlocking portion, and the guide groove is penetrated by the clamping slot. When the card block is located in the card slot, the free end of the unlocking portion is close to the end of the knob and fits with the card block; when unlocking the second connecting member, the knob is rotated, and the position where the free end of the unlocking portion and the card block fit changes. As the knob is rotated, the unlocking portion gradually presses the card block, and then pushes the card block out of the card slot, thereby unlocking the second connecting member.

2. The movable joint according to claim 1, characterized in that: The unlocking device further includes a pin, one end of which is fixedly connected to the connecting sleeve, and the other end of which is movably connected to the knob; An opening is provided on the top of the connecting sleeve, and the opening is clearance-fitted or transition-fitted with the second connecting piece.

3. The movable joint according to claim 2, characterized in that: There are multiple unlocking parts, and the multiple unlocking parts are located on the same end surface of the knob; The plurality of unlocking portions are distributed symmetrically about the center.

4. The movable joint according to claim 2, characterized in that: The unlocking device further includes a return member, which is mounted on the connecting sleeve and connected to the knob, and is used to provide return power for the knob; The return member is a torsion spring, which is sleeved on the circumferential surface of the pin shaft, with one end connected to the connecting sleeve and the other end connected to the knob.

5. The movable joint according to claim 2, characterized in that: The connecting sleeve is provided with a first limiting portion and a second limiting portion, and the knob is provided with a third limiting portion; The first limiting portion and the second limiting portion are used to provide a rotation space for the third limiting portion, thereby limiting the rotation angle range of the knob; The included angle between the first limiting portion and the second limiting portion is in the range of 30° to 90°.

6. The movable joint according to claim 1, characterized in that: The reset member is any one of a rubber block, a compression spring and a leaf spring.

7. The movable joint according to claim 1, characterized in that: A bearing end is provided at the bottom of the socket, and the bearing end is used to bear the second connecting member; The cross section of the socket is circular, and the diameter is larger than the outer contour diameter of the cross section of the columnar plug-in portion; A plurality of limit strips are provided above the end surface of the bearing end. The limit strips are distributed in a circular array, and their axes coincide with the axis of the socket. The limit strips are used to limit the radial displacement of the columnar plug-in portion.

8. The movable joint according to claim 1, characterized in that: An anti-slip cover is provided on the side wall of the knob, and a sealing cover is provided on the end of the knob; The anti-slip sleeve is connected to the knob in a snap-fitting manner, and the sealing cover is connected to the anti-slip sleeve in a snap-fitting manner; The anti-slip cover is provided with anti-slip lines; The anti-slip cover is made of any one of plastic, rubber, and thermoplastic elastomer; The sealing cover is made of any one of plastic, rubber and thermoplastic elastomer.

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