Baby stroller capable of being folded, unlocked and synchronously unfolded through joints

Abstract

The baby stroller comprises a front stroller set, a rear stroller set and a stroller pushing set, the front stroller set is rotationally connected with the stroller pushing set through a first large joint, the front stroller set is rotationally connected with the rear stroller set, a seat is installed on the front stroller set in a rotating connection mode, and the rear stroller set is installed on the rear stroller set in a rotating connection mode. A folding sheet is mounted on the inner side of the rear vehicle group in a rotary connection manner, and the other end of the folding sheet is rotationally connected with the two sides of the seat; at present, under the condition that a connecting rod mechanism is not arranged, linkage folding and unfolding between frames are achieved through hidden mechanisms at joints.

Description

Technical Field

[0001] The utility model relates to the field of baby strollers, and in particular to a baby stroller which can be folded, unlocked and unfolded synchronously through joints. Background Art

[0002] Current baby strollers are folded mainly through joints and connecting rods between the frames, and are folded by unlocking the joints. When folding, the folding between the various frame parts is generally achieved through a connecting rod mechanism, so multiple sets of connecting rods need to be installed between the frames, which affects the appearance of the frames. The joints on the frames are only used for rotational connection between the various frame parts, and the joints cannot achieve linkage folding between the frames. Current baby strollers are not equipped with a connecting rod mechanism, and cannot achieve linkage folding and unfolding between the various frame parts. Utility Model Content

[0003] In response to the above-mentioned deficiencies in the prior art, the present invention proposes a baby stroller that can be folded, unlocked and unfolded synchronously through joints. Without setting a connecting rod mechanism, the frame can be linked to each other and folded and unfolded through a hidden mechanism at the joint. In this way, the beauty of the frame is ensured without affecting the function of the stroller.

[0004] To achieve the above-mentioned object, the present invention provides a solution: a baby stroller that can be folded, unlocked, and synchronously unfolded by means of joints, comprising a front vehicle group, a rear vehicle group, and a push-carriage group, wherein the front vehicle group and the push-carriage group are rotatably connected by a first major joint, and the front vehicle group and the rear vehicle group are rotatably connected, a seat is mounted on the front vehicle group by means of a rotatable connection, and a folding plate is mounted on the inner side of the rear vehicle group by means of a rotatable connection, and the other end of the folding plate is rotatably connected to both sides of the seat;

[0005] A locking assembly is provided inside the first major joint, and the first major joint is locked by the locking assembly; an unlocking piece is installed on the first major joint, and the unlocking piece rotates coaxially with the first major joint, and the unlocking piece is fixed to the cart group; a cam limit piece is installed on the front car group, and a return torsion spring is provided between the cam limit piece and the front car group; a fixed limit piece is installed on the rear car group, which is in contact with the outer wall of the unlocking piece, and the fixed limit piece is rotationally connected to the front car group, and the fixed limit piece is locked by the unlocking piece and the cam limit piece.

[0006] Preferably, a protrusion is provided on the unlocking piece to press against the side of the fixed limiting piece, and a groove is provided on the other side of the fixed limiting piece for the cam limiting piece to press. A step surface is provided on the outer wall of the unlocking piece to press the cam limiting piece, and the step surface extends outward. A push block is provided on the top surface of the fixed limiting piece. When unfolding, the step surface first pushes the push block to unfold the rear vehicle group.

[0007] Preferably, an armrest mounting seat is installed on the side of the first major joint by a rotational connection, and the armrest mounting seat rotates coaxially with the first major joint. An arc groove is opened on the unlocking piece, and an arc groove is also provided on the side of the armrest mounting seat facing the first major joint. A limiting column is installed on the mounting seat, and the limiting column extends into the arc groove of the unlocking piece. A limiting block is installed on the first major joint, and the limiting block extends into the arc groove of the mounting seat.

[0008] Preferably, the first large joint includes a first rotating shell and a second rotating shell, the first rotating shell and the second rotating shell are spliced, the first rotating shell and the second rotating shell pass through a coaxial rotating shaft, a cavity is provided inside the first rotating shell and the second rotating shell, and the inner walls of the cavities of the first rotating shell and the second rotating shell are provided with first tooth grooves distributed in an annular array, a locking assembly is placed in the cavity, the locking assembly is a first gear meshed with multiple first tooth grooves, and the first gear sleeve moves on the rotating shaft; a spiral inclined surface distributed in an annular array is provided on the inner wall of the first rotating shell, a moving ring sleeve is sleeved on the rotating shaft between the first rotating shell and the gear, a pull rope connected to the moving ring sleeve, the pull rope extends through the first large joint and into the trolley group, an inclined groove fitting the spiral inclined surface is opened on the side of the moving ring sleeve facing the spiral inclined surface, and a spring is provided between the gear and the inner wall of the second rotating shell.

[0009] Preferably, a shade awning mounting rod is installed on the inner wall of the cart group, pins are provided at both ends of the shade awning mounting rod, a third large joint is provided between the shade awning mounting rod and the pin, a socket is provided on the inner side of the cart group, a through hole for inserting the pin is provided on the top of the socket, a hole is provided on the side of the socket, a groove is provided on the side of the pin, and a spring piece is installed in the pin groove. When the pin is inserted into the socket, the spring piece extends into the hole on the side of the socket.

[0010] Preferably, a connecting piece and a pin are respectively provided on the sides of the push car group and the rear car group, wherein the end of the connecting piece is inclined outward, and a groove is provided on the connecting piece for the pin to be embedded in the groove.

[0011] Preferably, a U-shaped frame is installed at the top of the push handle group through the second large joint, and a press-unlocking block is installed on the U-shaped frame, and the press-unlocking block is connected to the other end of the pull rope; the second large joint includes a third rotating shell and a fourth rotating shell, and the third rotating shell and the fourth rotating shell are spliced, and the third rotating shell and the fourth rotating shell pass through a coaxial rotating shaft, and a second tooth groove distributed in a circular array is provided on the inner wall of the third rotating shell and the fourth rotating shell, and a second gear moving on the rotating shaft is sleeved on the rotating shaft, and the second gear is meshed with the second tooth groove, and a groove body is opened at the center of the outer wall of the third rotating shell, and a button is embedded in the groove body, and a spring is provided between the bottom of the groove body and the button, and a through hole is opened at the bottom of the groove body, and a block is fixed at the bottom of the button, and the block passes through the through hole and presses on the second gear, and a spring is provided between the second gear and the inner wall of the fourth rotating shell, wherein the U-shaped rod, the second large joint and the trolley group are provided with a channel for the pull rope to pass through.

[0012] Compared with the prior art, the advantages of the present invention are:

[0013] The folding and unfolding of the frames can be realized in a linked manner by a hidden mechanism at the joints without setting a connecting rod mechanism, thereby ensuring the beauty of the frames without affecting the function of the stroller. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional schematic diagram of the present utility model.

[0015] Figure 2 It is a right view of the utility model.

[0016] Figure 3 This is a cross-sectional view of the utility model.

[0017] Figure 4 It is a schematic diagram of the plug, socket and spring of the utility model.

[0018] Figure 5 This is a schematic diagram of the first major joint of the utility model.

[0019] Figure 6 This is a schematic diagram of the articulation of the front and rear car groups of the present invention.

[0020] Figure 7 It is a schematic diagram of the front vehicle group, the rear vehicle group and the first major joint of the utility model.

[0021] Figure 8 It is a schematic diagram of the unlocking piece, cam limiting piece and fixed limiting piece of the utility model.

[0022] Figure 9 This is a schematic diagram of the fixed limiting piece of the utility model.

[0023] Figure 10This is a schematic diagram of the unlocking piece of the utility model.

[0024] Figure 11 It is a schematic diagram of the cam limiter of the utility model.

[0025] Figure 12 This is a schematic diagram of the armrest mounting seat and unlocking piece of the present invention.

[0026] Figure 13 This is a schematic diagram of the second largest joint of the utility model.

[0027] Figure 14 This is a schematic diagram of the press-to-unlock block of the utility model.

[0028] Among them, 1. front car group, 2. rear car group, 3. cart group, 4. first large joint, 5. first rotating shell, 6. second rotating shell, 7. first tooth groove, 8. locking assembly, 9. first gear, 10. spiral bevel, 11. moving ring, 12. pull rope, 13. seat, 14. folding piece, 16. unlocking piece, 17. cam limit piece, 18. torsion spring, 19. fixed limit piece, 20. bump, 21. give way groove, 22. step surface, 23. arc block, 24. push Block, 25. Handrail mounting seat, 26. Limit column, 27. Limit block, 28. Awning mounting rod, 29. Pin, 30. Third large joint, 31. Socket, 32. Shrapnel, 33. Connecting piece, 34. Lock column, 35. U-shaped frame, 36. Press to unlock block, 37. Second large joint, 38. Third rotating shell, 39. Fourth rotating shell, 40. Second tooth groove, 41. Second gear, 42. Button, 43. Block, 44. First arc groove, 45. Second arc groove. DETAILED DESCRIPTION

[0029] The present invention will now be further described with reference to the accompanying drawings.

[0030] As shown in Figure 1-14, a baby stroller that is folded, unlocked, and unfolded synchronously by means of joints comprises a front vehicle group 1, a rear vehicle group 2, and a stroller group 3. The front vehicle group 1 comprises a front vehicle group and a front wheel mounted on the front vehicle group, the rear vehicle group 2 comprises a front vehicle group and a rear wheel mounted on the rear frame, and the stroller group 3 is a straight rod, wherein the front vehicle group 1 and the stroller group 3 are rotationally connected by a first large joint 4, and the front vehicle group 1 and the rear vehicle group 2 are rotationally connected (the rotational connection is an articulation), so that the front vehicle group 1, the rear vehicle group 2, and the stroller group 3 are folded, and the front vehicle group 1 is rotated by rotating on the front vehicle group 1. A seat 13 is installed in a rotational connection manner (the front end of the seat 13 is riveted to the inner wall of the front vehicle group 1 by rivets, and the seat 13 rotates around the front vehicle group 1). A folding piece 14 is installed on the inner side of the rear vehicle group 2 by a rotational connection manner (one end of the folding piece 14 is riveted to the rear vehicle group 2 by rivets), and the other end of the folding piece 14 is rotationally connected to both sides of the rear end of the seat 13 (the other end of the folding piece 14 is riveted to both sides of the seat 13 by rivets). When the front vehicle group 1 and the rear vehicle group 2 are folded, the seat 13 is also folded;

[0031] The first large joint 4 is provided with a locking assembly 8, which locks the first large joint 4 through the locking assembly 8. When the first large joint 4 is locked, the trolley group 3 and the front car group 1 cannot rotate relative to each other; an unlocking piece 16 is installed on the first large joint 4, and the locking piece is a circular ring and the locking piece is sleeved on the first large joint 4 to rotate, and the unlocking piece 16 rotates coaxially with the first large joint 4. The unlocking piece 16 and the trolley group 3 are fixed by bolt locking. In this way, when the trolley group 3 rotates, the unlocking piece 16 also rotates. A cam limiting piece 17 is installed on the front car group 1 in a hinged manner, and a return torsional spring 18 is sleeved at the hinged joint of the cam limiting piece 17 and the front car group 1. The torsion spring 18 is used to swing the cam limiting piece 17 upward and fit the outer wall of the unlocking piece 16. A fixed limiting piece 19 that fits the outer wall of the unlocking piece 16 is installed on the rear car group 2 by bolt fastening. The fixed limiting piece 19 rotates with the rear car group 2;

[0032] by Figure 8As a reference, a protrusion 20 is fixed on the unlocking piece 16 by an integral injection molding method, which rests on the right side of the fixed limiting piece 19. The protrusion 20 protrudes from the circumferential outer wall of the unlocking piece 16, and a clearance groove 21 for the cam limiting piece 17 to press is opened on the left top surface of the fixed limiting piece 19. A step surface 22 for pressing the cam limiting piece 17 is provided on the outer wall of the unlocking piece 16 by an integral injection molding method. The step surface 22 extends outward to form multiple step surfaces 22. When the outermost step surface 22 presses on the cam limiting piece 17, the cam limiting piece 17 extends into the clearance groove 21 for pressing. A push block 24 protruding upward is provided on the top surface of the left side of the fixed limiting piece 19 by an integral injection molding method. When unfolding, the step surface 22 first pushes the pushing block 24 to unfold the rear car group 2. When folding, the first large joint 4 is unlocked first, so that the front car group 1 and the cart group 3 can rotate with each other. Taking the right view as an example, the cart group 3 is swung counterclockwise to fold it together with the front car group 1, so that the unlocking piece 16 also rotates counterclockwise. When the unlocking piece 16 rotates counterclockwise, the arc-shaped step surface 22 also rotates counterclockwise. When the inwardly concave step surface 22 of the unlocking piece 16 moves to above the fixed limiting piece 19, the step surface 22 gives way to the fixed limiting piece 19, and the fixed limiting piece 19 swings clockwise under the action of the gravity of the rear car group 2, so that the front car group 1 and the rear car group 2 are brought together to fold, thus completing the folding;When the cam 20 on the unlocking piece 16 contacts the right side of the fixed limiting piece 19, the push rod stops rotating, and the unlocking piece 16 limits the cam limit on the front car group 1. The positioning piece 17 is pressed downward, and one end of the cam limiting piece 17 extends into the clearance groove 21 on the left side of the fixed limiting piece 19 and presses into the clearance groove 21. In this way, the cam limiting piece 17 limits the clockwise rotation of the fixed limiting piece 19. Since the protrusion 20 abuts the right side of the fixed unlocking piece 16, the fixed limiting piece 19 is limited to rotate counterclockwise, thereby locking the fixed limiting piece 19. In this way, the rear vehicle group 2 is locked. The cam limiting piece presses on the fixed unlocking piece 16 mainly through the step surface 22 pressing on the top surface of the cam limiting piece 17. When the unlocking piece 16 rotates clockwise, the step surface 22 of the unlocking piece 16 presses the cam limiting piece downward, and the cam limiting piece is pressed into the clearance groove 21 of the fixed unlocking piece 16. In this way, the locking after deployment is completed, and the front vehicle group 1 and the cart group 3 are locked through the first large joint 4.

[0033] An armrest mounting seat 25 is mounted on the inner side of the first large joint 4 by means of a rotational connection (a pin hole is opened at the center of the armrest mounting seat 25, a center hole is opened at the center of the first large joint 4, a rotating shaft is inserted into the center hole of the first large joint 4, and the rotating shaft extends into the pin hole, so that the armrest mounting seat 25 rotates around the rotating shaft), the armrest mounting seat 25 rotates coaxially with the first large joint 4, a first arc-shaped groove 44 is opened on the unlocking piece 16, and a second arc-shaped groove 44 is provided on the side of the armrest mounting seat 25 facing the first large joint 4. The arc groove 45 (that is, a second arc groove 45 is opened on the outward side of the armrest mounting seat 25), the limiting column 26 is installed on the armrest mounting seat 25 (a hole is opened on the armrest mounting seat 25, the limiting column 26 is inserted into the hole, the limiting column 26 passes through the hole on the armrest mounting seat 25 and is fixed by glue), the limiting column 26 extends into the first arc groove 44 of the unlocking piece 16, and the limiting block 27 is installed on the inner wall of the first large joint 4 by an integral injection molding method. The limiting block 27 is located at the connection between the first large joint 4 and the front vehicle group 1 On the joint, the limit block 27 extends into the arc groove of the armrest mounting seat 25. When the trolley group 3 is folded, the armrest needs to be folded along with it. The first large joint 4 is unlocked, the push handle frame rotates counterclockwise, and the limit column 26 moves in the first arc groove 44. When the push handle frame overlaps with the armrest, the limit column 26 moves to the end of the first arc groove 44. In this way, under the action of the limit column 26 and the first arc groove 44, the armrest mounting seat 25 moves with the trolley frame. When the armrest mounting seat 25 is rotated and folded, the limit block 27 slides along the second arc groove 45 on the armrest mounting seat 25. When the limit block 27 slides from the starting end to the end of the second arc groove 45, the armrest fits with the front vehicle group 1, thus completing the folding. When it is fully unfolded, the armrest mounting seat 25 is locked by the first arc groove 44 and the second arc groove 45 (when the armrest frame needs to continue to swing upward, the first arc groove 44 is locked with the limit column 26, and when the armrest frame needs to continue to swing downward, the limit block 27 is locked with the second arc groove 45).

[0034] The first large joint 4 includes a first rotating shell 5 and a second rotating shell 6. The first rotating shell 5 is fixed to the trolley group 3 by bolts, and the second rotating shell 6 is fixed to the front car group 1 by bolts. The second rotating shell 6 is located on the inner side of the first rotating shell 5. The limit block 27 is fixed to the outer wall of the second rotating shell 6 by integral injection molding. The first rotating shell 5 and the second rotating shell 6 are spliced. The first rotating shell 5 and the second rotating shell 6 pass through a coaxial rotating shaft. The first rotating shell 5 and the second rotating shell 6 rotate around the rotating shaft. A cavity is opened inside the rotating shell 6, and first tooth grooves 7 distributed in a ring array are opened on the inner wall of the cavity of the first rotating shell 5 and the second rotating shell 6. The first tooth grooves 7 on the first rotating shell 5 and the second rotating shell 6 are arranged opposite to each other, and a locking assembly 8 is placed in the cavity. The locking assembly 8 is a first gear 9 meshing with the multiple first tooth grooves 7. The first gear 9 is sleeved on the rotating shaft for movement. In the normal state, the first gear 9 is stuck in the first tooth groove 7 of the first rotating shell 5 and the second rotating shell 6, so that the first rotating shell 5 and the second rotating shell 6 are locked. When the first gear 9 slides and is completely inserted into the first rotating shell 5 or the second rotating shell 6, thereby locking the relative rotation; a spiral bevel 10 distributed in a ring array is fixed on the inner wall of the first rotating shell 5 by an integral injection molding method, and a mobile ring sleeve 11 is sleeved on the rotating shaft between the first rotating shell 5 and the gear. The mobile ring sleeve 11 is riveted to one end of a pull rope 12, and the pull rope 12 extends through the first large joint 4 and extends into the trolley group 3. The rotation of the mobile ring is achieved by pulling the pull rope 12. A groove is opened on the side of the mobile ring sleeve 11 facing the spiral bevel 10 to fit the spiral bevel 10. The inclined groove is provided, and the spring is on the rotating shaft between the first gear 9 and the inner wall of the second rotating shell 6. The rotation of the mobile ring 11 is realized by pulling the pull rope 12, and it moves toward the second rotating shell 6 under the action of the spiral inclined surface 10. In this way, the mobile ring 11 pushes the first gear 9 toward the second rotating shell 6, so that the first gear 9 is separated from the first rotating shell 5, so that the first large joint 4 is unlocked. When the pull rope 12 is released, the spring pushes the first gear 9 into the first rotating shell 5, so that the first gear 9 is re-engaged in the first rotating shell 5 and the second rotating shell 6, thereby locking.

[0035] A shade awning mounting rod 28 is installed on the inner wall of the cart group 3. The shade awning mounting rod 28 is a U-shaped rod. Pins 29 are installed at both ends of the shade awning mounting rod 28. A third large joint 30 is provided between the shade awning mounting rod 28 and the pin (the third large joint is formed by rotating through two joint seats. A hole is opened at the center of the joint seat, and a pin is inserted into the hole, so that the rotation connection of the joint seat is realized. The two joint seats are fixed to the shade awning mounting rod and the pin respectively by bolt fastening). A socket 31 is fixed to the inside of the cart group 3 by bolt fastening. A through hole for inserting the pin is opened at the top of the socket 31, a hole is opened on the side of the socket 31, and a groove is opened on the side of the pin. A spring piece 32 is fixed in the groove of the pin by bolt fastening. When the pin is inserted into the socket 31, the spring piece 32 extends into the hole on the side of the socket 31, thus completing the locking.

[0036] The sides of the trolley group 3 and the rear group 2 are respectively provided with a connecting piece 33 and a locking column 34. Taking the right view as an example, the end (front end) of the connecting piece 33 is inclined outward, and one end (rear end) of the connecting piece 33 is fixed to the outer wall of the rear group 2 by bolt fastening. A groove is provided on the connecting piece 33 for the locking column 34 to be embedded in. When the trolley group 3 rotates counterclockwise and folded with the front group 1, the locking column 34 is inserted into the groove of the connecting piece 33 to complete the locking, thereby completing the bundling of the front group 1, the rear group 2 and the trolley group 3.

[0037] A U-shaped frame 35 is installed on the top of the push handle group through the second large joint 37, and a push-unlocking block 36 is installed on the top of the U-shaped frame 35. The push-unlocking block 36 is connected to the other end of the pull rope 12, and the first large joint 4 is unlocked by pressing the push-unlocking block 36; the second large joint 37 includes a third rotating shell 38 and a fourth rotating shell 39, and the third rotating shell 38 and the fourth rotating shell 39 are spliced ​​together. The third rotating shell 38 and the fourth rotating shell 39 pass through a coaxial rotating shaft, and the inner walls of the third rotating shell 38 and the fourth rotating shell 39 are opened with a circular array of divided parts. The second tooth groove 40 of the cloth is sleeved with a second gear 41 that moves on the rotating shaft. The second gear 41 is meshed with the second tooth groove 40. A groove body is opened at the center of the outer wall of the third rotating shell 38. A button 42 that slides in the groove body is embedded in the groove body. A spring is clamped between the bottom of the groove body and the button 42. The button 42 is pushed outward and returned to its position by the spring. A through hole is opened at the bottom of the groove body. A stop block 43 is fixed to the bottom of the button 42 by integral injection molding. The stop block 43 passes through the through hole and abuts on the second gear 41. When the second gear 41 and the fourth rotating shell are connected, a spring is provided between the bottom of the groove body and the button 42. A spring is clamped on the rotating shaft between the inner walls of the body 39, and the second gear 41 is pushed outward by the spring, wherein the U-shaped rod, the second large joint 37 and the trolley group 3 have a channel for the pull rope 12 to pass through. When the button 42 is pressed, the second gear 41 moves inward and separates from the second tooth groove 40 of the third rotating shell 38, so that the third rotating shell 38 and the fourth rotating shell 39 can rotate relative to each other, so that the angle of the U-shaped rod can be adjusted; the unlocking block 36 is pressed to extend into the U-shaped rod through the notch of the U-shaped rod, and a mounting block is fixed in the U-shaped rod by bolts. There are sliding grooves on the upper and lower surfaces of the mounting block, and a moving block sliding in the sliding groove is provided in the sliding groove. The left side of the top of the moving block is a triangular inclined surface, and an inclined surface that fits the triangular inclined surface of the moving block is provided on one end of the push-unlocking block 36 extending into the U-shaped rod. A spring is fixed between the push-unlocking block 36 and the handle frame by welding, and the push-unlocking block 36 is pushed outward by the spring. When the push-unlocking block 36 is pressed, the cable is pulled, and the first large joint 4 is unlocked. Unlocking the large joint by pressing the unlocking block 36 and the pull rope 12 is a conventional technical means in the field of carts.

Claims

1. A baby stroller that folds, unlocks, and unfolds synchronously via joints, comprising a front carriage group, a rear carriage group, and a pushchair group, wherein the front carriage group and the pushchair group are rotationally connected via a first major joint, and the front carriage group and the rear carriage group are rotationally connected, a seat is rotationally mounted on the front carriage group, and a folding plate is rotationally mounted on the inner side of the rear carriage group, with the other end of the folding plate being rotationally connected to both sides of the seat; It is characterized in that A locking assembly is provided inside the first major joint, and the first major joint is locked by the locking assembly; an unlocking piece is installed on the first major joint, and the unlocking piece rotates coaxially with the first major joint, and the unlocking piece is fixed to the cart group; a cam limit piece is installed on the front car group, and a return torsion spring is provided between the cam limit piece and the front car group; a fixed limit piece is installed on the rear car group, which is in contact with the outer wall of the unlocking piece, and the fixed limit piece is rotationally connected to the front car group, and the fixed limit piece is locked by the unlocking piece and the cam limit piece.

2. A baby stroller that can be folded, unlocked and unfolded synchronously by means of joints according to claim 1, characterized in that: The unlocking piece is provided with a protrusion that presses against the side of the fixed limiting piece, and the other side of the fixed limiting piece is provided with a yield groove for the cam limiting piece to press. The outer wall of the unlocking piece is provided with a step surface for pressing the cam limiting piece, and the step surface extends outward. A push block is provided on the top surface of the fixed limiting piece. When unfolding, the step surface first pushes the push block to unfold the rear vehicle group.

3. A baby stroller that can be folded, unlocked and unfolded synchronously by means of joints according to claim 2, characterized in that: An armrest mounting seat is installed on the side of the first major joint through a rotational connection. The armrest mounting seat rotates coaxially with the first major joint. An arc groove is opened on the unlocking piece, and an arc groove is also provided on the side of the armrest mounting seat facing the first major joint. A limiting column is installed on the mounting seat, and the limiting column extends into the arc groove of the unlocking piece. A limiting block is installed on the first major joint, and the limiting block extends into the arc groove of the mounting seat.

4. A baby stroller that can be folded, unlocked and unfolded synchronously by means of joints according to claim 3, characterized in that: The first major joint includes a first rotating shell and a second rotating shell, which are spliced ​​with the first rotating shell and the second rotating shell, and the first rotating shell and the second rotating shell pass through a coaxial rotating shaft, and a cavity is provided inside the first rotating shell and the second rotating shell, and the inner walls of the cavities of the first rotating shell and the second rotating shell are provided with first tooth grooves distributed in an annular array, and a locking assembly is placed in the cavity, and the locking assembly is a first gear meshed with multiple first tooth grooves, and the first gear sleeve moves on the rotating shaft; a spiral inclined surface distributed in an annular array is provided on the inner wall of the first rotating shell, and a moving ring sleeve is sleeved on the rotating shaft between the first rotating shell and the gear, and a pull rope connected to the moving ring sleeve extends through the first major joint and into the trolley group, and an inclined groove that fits the spiral inclined surface is opened on the side of the moving ring sleeve facing the spiral inclined surface, and a spring is provided between the gear and the inner wall of the second rotating shell.

5. A baby stroller that can be folded, unlocked and unfolded synchronously by means of joints according to claim 4, characterized in that: A shade awning mounting rod is installed on the inner wall of the cart group, and pins are provided at both ends of the shade awning mounting rod. A third joint is provided between the shade awning mounting rod and the pin. A socket is provided on the inner side of the cart group, and a through hole for inserting the pin is provided on the top of the socket, a hole is provided on the side of the socket, and a groove is provided on the side of the pin. A spring is installed in the pin groove, and when the pin is inserted into the socket, the spring extends into the hole on the side of the socket.

6. The baby stroller that can be folded, unlocked and unfolded synchronously by means of joints according to claim 5, characterized in that: The sides of the push car group and the rear car group are respectively provided with connecting pieces and pins, wherein the ends of the connecting pieces are inclined outwards, and grooves are provided on the connecting pieces for the pins to be embedded in.

7. A baby stroller that can be folded, unlocked and unfolded synchronously by means of joints according to claim 6, characterized in that: A U-shaped frame is installed at the top of the push handle group through the second large joint, and a press-unlocking block is installed on the U-shaped frame, and the press-unlocking block is connected to the other end of the pull rope; the second large joint includes a third rotating shell and a fourth rotating shell, and the third rotating shell and the fourth rotating shell are spliced, and the third rotating shell and the fourth rotating shell pass through a coaxial rotating shaft, and a second tooth groove distributed in a circular array is provided on the inner wall of the third rotating shell and the fourth rotating shell, and a second gear moving on the rotating shaft is sleeved on the rotating shaft, and the second gear is meshed with the second tooth groove. A groove body is opened at the center of the outer wall of the third rotating shell, and a button is embedded in the groove body. A spring is provided between the bottom of the groove body and the button, and a through hole is opened at the bottom of the groove body. A resist block is fixed at the bottom of the button, and the resist block passes through the through hole and resists the second gear, and a spring is provided between the second gear and the inner wall of the fourth rotating shell. The U-shaped rod, the second large joint and the trolley group are provided with a channel for the pull rope to pass through.

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