Baby carriage frame

Abstract

The utility model discloses a baby carriage frame, and relates to the technical field of baby carriages. According to the technical scheme, the folding scooter is characterized by comprising two lower folding joints, two upper folding joints, a front wheel mechanism, a rear wheel mechanism, two lower push rods and an upper push rod; the upper folding joint is unlocked through the folding unlocking switch, then the upper push rod rotates around the upper folding joint, and folding of the upper push rod and the lower push rod is achieved. After the upper push rod rotates, the lower folding joint is unlocked through the upper folding joint, the folded upper push rod and the folded lower push rod rotate around the lower folding joint under the action of gravity and drive the front wheel mechanism to rotate around the lower folding joint, and therefore folding is achieved. Unlocking is achieved through rotation in the folding process, folding and unlocking are achieved at the same time, and folding continues after unlocking, so that a folding linkage structure can be reduced, a transmission path is shortened, folding can be smoothly and stably executed, the fault probability is reduced, and user experience is optimized.

Description

Technical Field

[0001] The utility model relates to the technical field of baby carriages, and more particularly to a baby carriage frame. Background Art

[0002] In order to facilitate storage and preservation, today's strollers usually adopt a foldable structure.

[0003] The existing Chinese patent with authorization announcement number CN217198315U discloses a gravity-automatic folding baby carriage frame. After the upper push rod assembly and the lower push rod assembly are locked, due to gravity, the lower push rod assembly rotates downward to drive the upper push rod assembly to rotate, and the rotation of the upper push rod assembly drives the push rod support rod assembly to rotate. The rotation of the push rod support rod assembly drives the basket frame rod connecting piece to move upward and rotate the connected rear basket frame rod assembly toward the rear bracket assembly. The rear basket frame rod assembly drives the front basket frame rod assembly and rotates the connected front bracket assembly toward the rear bracket assembly. At the same time, the push rod support rod assembly drives the front armrest assembly and rotates the connected front armrest support rod assembly toward the rear bracket assembly. The front armrest support rod assembly drives the rear seat rod assembly to rotate toward the front seat rod assembly, thereby folding and stowing each component.

[0004] Although the stroller frame in the above patent can automatically fold using gravity, its structure is relatively complex and the folding transmission path is long. The weight of the stroller frame is usually designed to be smaller, so manual assistance is often required during folding, which affects the user experience. In addition, the long transmission path is prone to failure. Utility Model Content

[0005] In response to the shortcomings of the existing technology, the purpose of the present invention is to provide a baby carriage frame that utilizes rotation during the folding process to achieve unlocking, so that it can be folded and unlocked at the same time, and then continue to fold after unlocking. This can reduce the folding linkage structure, shorten the transmission path, facilitate smooth and stable folding, reduce the probability of failure, and optimize the user experience.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A baby carriage frame, comprising two lower folding joints, two upper folding joints, a front wheel mechanism connected to the two lower folding joints, a rear wheel mechanism connected to the two lower folding joints, two lower push rods, and an upper push rod connected to the two upper folding joints; one end of the lower push rod is connected to the upper folding joint, and the other end is connected to the lower folding joint;

[0008] The upper push rod is provided with a folding unlocking switch acting on the upper folding joint, and the upper folding joint is used to unlock the lower folding joint;

[0009] Among them, the upper folding joint is unlocked by the folding unlocking switch, and then the upper push rod is rotated around the upper folding joint to realize the folding of the upper push rod and the lower push rod; after the upper push rod is rotated, the lower folding joint is unlocked through the upper folding joint, and the folded upper push rod and the lower push rod are rotated around the lower folding joint under the action of gravity, and drive the front wheel mechanism to rotate around the lower folding joint, thereby realizing folding.

[0010] Furthermore, a first unlocking cable is provided between the folding unlocking switch and the upper folding joint.

[0011] Furthermore, a second unlocking cable is provided between the upper folding joint and the lower folding joint.

[0012] Furthermore, the upper folding joint is unlocked by the folding unlocking switch, and then the upper push rod is rotated counterclockwise around the upper folding joint to achieve folding of the upper push rod and the lower push rod; after the upper push rod is rotated, the lower folding joint is unlocked through the upper folding joint, and the folded upper push rod and the lower push rod are rotated in the clockwise direction around the lower folding joint under the action of gravity, and drive the front wheel mechanism to rotate in the counterclockwise direction around the lower folding joint, thereby achieving folding.

[0013] Furthermore, the upper folding joint includes an upper joint pivot portion connected to the upper push rod, an upper joint base connected to the lower push rod, and a first position-limiting tooth arranged between the upper joint pivot portion and the upper joint base; a first tooth groove and a second tooth groove cooperating with the first position-limiting tooth are respectively arranged in the upper joint pivot portion and the upper joint base;

[0014] A first rotating push block in contact with the first limiting tooth is provided in the upper joint pivot portion; one end of the first unlocking cable is connected to the first rotating push block, and the other end is connected to the folding unlocking switch;

[0015] The first limiting tooth includes a first locking state in which the first tooth groove and the second tooth groove are respectively embedded, and a first unlocking state in which the second tooth groove is embedded;

[0016] Among them, the folding unlocking switch drives the first rotating push block to rotate through the first unlocking cable. The first rotating push block moves axially while rotating and drives the first limiting tooth to move, so that the first limiting tooth switches from the first locking state to the first unlocking state, and the upper joint pivot part can rotate.

[0017] Furthermore, a positioning ring is provided in the upper joint base, and a cable positioning block is provided on the positioning ring, which extends axially into the first tooth groove, and one end of the second unlocking cable is connected to the cable positioning block; a driving boss is provided in the first tooth groove, which cooperates with the cable positioning block;

[0018] The driving boss rotates along with the upper joint pivoting portion, and the driving boss rotates to contact the cable positioning block and drives the cable positioning block to rotate, and the cable positioning block drives the lower folding joint to unlock through the second unlocking cable.

[0019] Furthermore, the lower folding joint includes a lower joint base connected to the rear wheel mechanism, a lower joint first pivot portion connected to the lower push rod, a lower joint second pivot portion connected to the front wheel mechanism, a transmission plate connected between the lower joint first pivot portion and the lower joint second pivot portion, and a second limiting tooth provided between the lower joint base and the lower joint first pivot portion;

[0020] The first pivot portion of the lower joint and the lower joint base are respectively provided with a third tooth groove and a fourth tooth groove that cooperate with the second limiting tooth;

[0021] The second limiting tooth includes a second locking state in which the second limiting tooth is respectively embedded in the third tooth groove and the fourth tooth groove, and a second unlocking state in which the second limiting tooth is embedded in the fourth tooth groove;

[0022] A second rotating push block in contact with the second limiting tooth is provided in the first pivot portion of the lower joint, and the second rotating push block is connected to one end of the second unlocking cable;

[0023] Among them, the second unlocking cable drives the second rotating push block to rotate, and the second rotating push block moves axially while rotating, and drives the second limiting tooth to move, so that the second limiting tooth switches from the second locking state to the second unlocking state; then, the first pivot part of the lower joint can rotate around the first axis, and the first pivot part of the lower joint drives the second pivot part of the lower joint to rotate around the second axis through the transmission plate.

[0024] Furthermore, a first limiting groove is provided in the lower joint base, a limiting block in contact with the second limiting tooth is provided in the first limiting groove, and a second limiting groove cooperating with the limiting block is provided on the second pivot portion of the lower joint;

[0025] The limiting block includes a third locking state respectively embedded in the first limiting groove and the second limiting groove, and a third unlocking state embedded in the first limiting groove;

[0026] Wherein, when the second limiting tooth moves, it drives the limiting block to switch from the third locking state to the third unlocking state, so that the second pivoting part of the lower joint can rotate around the second axis.

[0027] Furthermore, the baby carriage frame also includes a seat mechanism connected to the two lower folding joints respectively, and a foot support bracket hinged to the seat mechanism; a seat locking assembly is provided between the seat mechanism and the lower folding joint; after the seat mechanism is unlocked by the seat locking assembly, the seat mechanism can be rotated and folded around the lower folding joint in the clockwise direction.

[0028] Furthermore, the lower folding joint includes a third pivot portion of the lower joint connected to the seat plate mechanism, and a lower joint base; the seat plate locking assembly includes a locking pin passed through the third pivot portion of the lower joint, and the lower joint base is provided with a locking groove that cooperates with the locking pin; a third unlocking cable is provided between the foot support bracket and the locking pin; wherein, when the foot support bracket is rotated in the clockwise direction relative to the seat plate mechanism, the foot support bracket drives the locking pin to move out of the locking groove through the third unlocking cable, and the third pivot portion of the lower joint can rotate.

[0029] In summary, the present invention has the following beneficial effects:

[0030] 1. The present invention utilizes rotation during the folding process to achieve unlocking, enabling simultaneous folding and unlocking, and continued folding after unlocking. This reduces the number of folding linkage structures, shortens the transmission path, facilitates smooth and stable folding, reduces the probability of malfunction, and optimizes user experience.

[0031] 2. Connect the third unlocking cable to the foot support bracket, and use the rotation of the foot support bracket during the folding process to unlock the seat mechanism. The foot support bracket acts as a switch for the seat locking assembly. This arrangement can simplify the structure, eliminate an unlocking operation, and optimize the user experience.

[0032] 3. The upper joint pivot rotates during the folding process to unlock the lower folding joint, achieving simultaneous folding and unlocking. The upper joint pivot acts as the unlocking switch for the lower folding joint. This arrangement simplifies the structure, eliminates an unlocking operation, and optimizes the user experience.

[0033] 4. Setting a limit block between the second pivot part of the lower joint and the lower joint base is beneficial to improving the stability of the second pivot part of the lower joint and the front wheel mechanism; using the second limit tooth as the unlocking switch of the limit block can simplify the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The structure of the baby carriage frame in the embodiment is shown in FIG. Figure 1 ;

[0035] Figure 2 The structure of the baby carriage frame in the embodiment is shown in FIG. Figure 2 ;

[0036] Figure 3The structure of the baby carriage frame in the embodiment is shown in FIG. Figure 3 ;

[0037] Figure 4 Schematic diagram of the structure of the foot support bracket, the third unlocking cable and the lower folding joint in the embodiment;

[0038] Figure 5 Schematic diagram of the structure of the locking pin, the third unlocking cable and the lower folding joint in the embodiment;

[0039] Figure 6 The structure diagram of the lower folding joint in the embodiment Figure 1 ;

[0040] Figure 7 2. It is a schematic structural diagram of the third pivot portion of the lower joint in the embodiment;

[0041] Figure 8 The structure diagram of the upper folding joint in the embodiment Figure 1 ;

[0042] Figure 9 The structure diagram of the upper folding joint in the embodiment Figure 2 ;

[0043] Figure 10 Schematic diagram of the structure of the positioning ring and the cable positioning block in the embodiment;

[0044] Figure 11 The structure diagram of the lower folding joint in the embodiment Figure 2 ;

[0045] Figure 12 The structure diagram of the lower folding joint in the embodiment Figure 3 ;

[0046] Figure 13 Schematic diagram of the structure of the lower joint base and the limit block in the embodiment;

[0047] Figure 14 Schematic diagram of the structure of the first pivot portion of the lower joint, the second pivot portion of the lower joint and the transmission plate in the embodiment.

[0048] In the figure: 1, upper folding joint; 11, upper joint base; 111, second tooth groove; 12, upper joint pivot; 121, first tooth groove; 122, drive boss; 13, first limit tooth; 14, first rotating push block; 151, positioning ring; 152, cable positioning block; 2, lower folding joint; 21, lower joint base; 211, locking groove; 212, fourth tooth groove; 213, first limit groove; 22, first pivot of lower joint; 221, third tooth groove; 23, second pivot of lower joint Part; 231, second limiting groove; 24, second limiting tooth; 25, second rotating push block; 26, limiting block; 27, transmission plate; 28, third pivot part of lower joint; 291, fourth pivot part of lower joint; 292, fifth pivot part of lower joint; 31, upper push rod; 32, lower push rod; 33, folding unlocking switch; 41, front wheel mechanism; 42, rear wheel mechanism; 51, seat plate mechanism; 52, foot support bracket; 53, locking pin; 54, third unlocking cable; 6, protective bracket; 7, backrest bracket. DETAILED DESCRIPTION

[0049] The present invention will be described in further detail below with reference to the accompanying drawings.

[0050] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law. Example

[0051] A baby carriage frame, referring to Figures 1 to 14 It includes two lower folding joints 2, two upper folding joints 1, front wheel mechanisms 41 respectively connected to the two lower folding joints 2, rear wheel mechanisms 42 respectively connected to the two lower folding joints 2, two lower push rods 32, upper push rods 31 respectively connected to the two upper folding joints 1, seat mechanisms 51 respectively connected to the two lower folding joints 2, foot support brackets 52 hinged to the seat mechanism 51, protective brackets 6 respectively connected to the two lower folding joints 2 and backrest brackets 7 respectively connected to the two lower folding joints 2; one end of the lower push rod 32 is connected to the upper folding joint 1, and the other end is connected to the lower folding joint 2; a seat locking assembly is arranged between the seat mechanism 51 and the lower folding joint 2; a folding unlocking switch 33 acting on the upper folding joint 1 is provided on the upper push rod 31, and the upper folding joint 1 is used to unlock the lower folding joint 2.

[0052] Reference Figures 1 to 14In this embodiment, the baby carriage frame can be folded, and includes two folding operations; the first folding operation is used to realize the folding of the seat plate mechanism 51, the foot support bracket 52 and the protective bracket 6, and the second folding operation is used to realize the folding of the upper push rod 31, the lower push rod 32, the front wheel mechanism 41 and the rear wheel mechanism 42; in order to realize the overall folding of the baby carriage frame, the first folding operation is usually performed first, and then the second folding operation is performed; this can optimize the structure, shorten the transmission path, facilitate smooth and stable folding, reduce the probability of failure, and optimize the user experience.

[0053] Reference Figures 1 to 14 In this embodiment, the lower folding joint 2 includes a lower joint base 21 connected to the rear wheel mechanism 42, a lower joint third pivot portion 28 connected to the seat plate mechanism 51, a lower joint fourth pivot portion 291 connected to the protective bracket 6, and a lower joint fifth pivot portion 292 connected to the backrest bracket 7; the lower joint third pivot portion 28, the lower joint fifth pivot portion 292, the lower joint fourth pivot portion 291 and the lower joint base 21 are arranged in sequence along the axial direction, and the lower joint third pivot portion 28, the lower joint fifth pivot portion 292 and the lower joint fourth pivot portion 291 can rotate around the first axis relative to the lower joint base 21; wherein, an axial extension ring is provided at the end of the lower joint fourth pivot portion 291, and the lower joint fifth pivot portion 292 is rotatably mounted on the axial extension ring. In this embodiment, there is no circumferential limit between the lower joint fifth pivot portion 292 and the axial extension ring.

[0054] Reference Figures 1 to 14 A seat locking assembly is provided between the seat mechanism 51 and the lower folding joint 2; specifically, in this embodiment, the seat locking assembly includes a locking pin 53 passed through the third pivot portion 28 of the lower joint, and a locking slot 211 cooperating with the locking pin 53 is provided on the lower joint base 21; a third unlocking cable 54 is provided between the foot support bracket 52 and the locking pin 53; when the stroller frame is in the unfolded state, the foot support bracket 52 is located below the seat mechanism 51, and the angle of the foot support bracket 52 can be adjusted.

[0055] Reference Figures 1 to 14 When performing the first folding operation, the foot support bracket 52 is rotated clockwise relative to the seat plate mechanism 51, that is, the foot support bracket 52 is rotated upward; when the foot support bracket 52 rotates, it applies a pulling force to the third unlocking cable 54, and the third unlocking cable 54 drives the locking pin 53 to move to disengage from the locking slot 211, thereby unlocking the seat plate mechanism 51; then, the foot support bracket 52 drives the seat plate mechanism 51 to continue to rotate in the clockwise direction; after the third pivot part 28 of the lower joint contacts the fourth pivot part 291 of the lower joint, it drives the fourth pivot part 291 of the lower joint to rotate, thereby driving the protective bracket 6 to fold; therefore, the first folding operation realizes the folding of the foot support bracket 52, the seat plate mechanism 51 and the protective bracket 6.

[0056] Reference Figures 1 to 14 Preferably, an elastic member is provided between the third pivot portion 28 of the lower joint and the locking pin 53, and the elastic force of the elastic member causes the locking pin 53 to have a tendency to be embedded in the locking groove 211; in this embodiment, the third unlocking cable 54 is arranged at the bottom of the seat plate mechanism 51, and one end of the third unlocking cable 54 is fixedly connected to the locking pin 53, and the other end is fixedly connected to the foot support bracket 522.

[0057] Reference Figures 1 to 14 In this embodiment, the third unlocking cable 54 is connected to the foot support bracket 52, and the rotation of the foot support bracket 52 during the folding process is used to unlock the seat mechanism 51, so that folding and unlocking can be achieved at the same time. The foot support bracket 52 is equivalent to the switch of the seat locking assembly; such an arrangement can simplify the structure, eliminate an unlocking operation, and optimize the user experience.

[0058] Reference Figures 1 to 14 In this embodiment, a first unlocking cable is provided between the folding unlocking switch 33 and the upper folding joint 1, and a second unlocking cable is provided between the upper folding joint 1 and the lower folding joint 2; the first unlocking cable is provided in the upper push rod 31, and the second unlocking cable is provided in the lower push rod 32.

[0059] Reference Figures 1 to 14 When the second folding operation is performed, the folding unlocking switch 33 applies a pulling force to the first unlocking cable, and the first unlocking cable unlocks the upper folding joint 1, and then the upper push rod 31 is rotated counterclockwise around the upper folding joint 1, that is, the upper push rod 31 is rotated downward, so as to realize the folding of the upper push rod 31 and the lower push rod 32; after the upper push rod 31 rotates, the upper folding joint 1 applies a pulling force to the second unlocking cable, and the second unlocking cable unlocks the lower folding joint 2; then, the folded upper push rod 31 and the lower push rod 32 rotate around the lower folding joint 2 in the clockwise direction under the action of gravity, that is, rotate downward toward the direction close to the rear wheel mechanism 42; through the lower folding joint 2, the front wheel mechanism 41 is driven to rotate clockwise around the lower folding joint 2, so that the front wheel mechanism 41 is close to the rear wheel mechanism 42, thereby realizing folding.

[0060] Reference Figures 1 to 14 The upper push rod 31 rotates downward around the upper folding joint 1 until it contacts the folded seat plate mechanism 51. Then, the folded upper push rod 31, the foot support bracket 52, the seat plate mechanism 51, the protective bracket 6, the backrest bracket 7 and the lower push rod 32 rotate around the lower folding joint 2 in the clockwise direction under the action of gravity, thereby realizing the folding of the entire frame.

[0061] Reference Figures 1 to 14Specifically, in this embodiment, the upper folding joint 1 includes an upper joint pivot part 12 connected to the upper push rod 31, an upper joint base 11 connected to the lower push rod 32, and a first limiting tooth 13 arranged between the upper joint pivot part 12 and the upper joint base 11; the upper joint pivot part 12 and the upper joint base 11 are respectively provided with a first tooth groove 121 and a second tooth groove 111 that cooperate with the first limiting tooth 13; the first limiting tooth 13 can move axially, and includes a first locking state respectively embedded in the first tooth groove 121 and the second tooth groove 111, and a first unlocking state embedded in the second tooth groove 111; an elastic member is provided between the first limiting tooth 13 and the upper joint base 11, and the elastic force of the elastic member makes the first limiting tooth 13 have a tendency to move to the first locking state.

[0062] Reference Figures 1 to 14 A first rotating push block 14 in contact with the first limiting tooth 13 is provided in the upper joint pivot part 12, and a guide slope is provided between the first rotating push block 14 and the upper joint pivot part 12; through the guide slope, the first rotating push block 14 moves axially relative to the upper joint pivot part 12 while rotating; one end of the first unlocking cable is connected to the first rotating push block 14, and the other end is connected to the folding unlocking switch 33; the folding unlocking switch 33 is used to apply tension to the first unlocking cable, and can adopt various structures in the existing technology, which will not be repeated here.

[0063] Reference Figures 1 to 14 The folding unlocking switch 33 drives the first rotating push block 14 to rotate through the first unlocking cable. The first rotating push block 14 moves axially while rotating and drives the first limiting tooth 13 to move. The first limiting tooth 13 moves to disengage from the first tooth groove 121 and is embedded in the second tooth groove 111. The first limiting tooth 13 switches from the first locking state to the first unlocking state, and the upper joint pivot part 12 can rotate.

[0064] Reference Figures 1 to 14 In this embodiment, a positioning ring 151 is provided in the upper joint base 11, and a cable positioning block 152 is provided on the positioning ring 151, which extends axially into the first tooth groove 121, and one end of the second unlocking cable is connected to the cable positioning block 152; a driving boss 122 that cooperates with the cable positioning block 152 is provided in the first tooth groove 121; when the upper joint pivot part 12 rotates, the driving boss 122 rotates along with the upper joint pivot part 12, and the driving boss 122 rotates until it contacts the cable positioning block 152 and drives the cable positioning block 152 to rotate. After rotation, the cable positioning block 152 applies tension to the second unlocking cable, thereby driving the lower folding joint 2 to be unlocked by the second unlocking cable.

[0065] Reference Figures 1 to 14In this embodiment, the upper joint pivot part 12 is used to rotate during the folding process to realize the unlocking of the lower folding joint 2, so that folding and unlocking can be achieved at the same time. The upper joint pivot part 12 is equivalent to the unlocking switch of the lower folding joint 2. Such an arrangement can simplify the structure, eliminate an unlocking operation, and optimize the user experience.

[0066] Reference Figures 1 to 14 In this embodiment, the lower folding joint 2 also includes a first pivot portion 22 of the lower joint connected to the lower push rod 32, a second pivot portion 23 of the lower joint connected to the front wheel mechanism 41, a transmission plate 27 connected between the first pivot portion 22 of the lower joint and the second pivot portion 23 of the lower joint, and a second limiting tooth 24 arranged between the lower joint base 21 and the first pivot portion 22 of the lower joint; a third tooth groove 221 and a fourth tooth groove 212 that cooperate with the second limiting tooth 24 are respectively provided in the first pivot portion 22 of the lower joint and the lower joint base 21; the second limiting tooth 24 can move along the axial direction and includes a third tooth groove 221 and a fourth tooth groove 212 respectively embedded in the third tooth groove 22 1 and a second locked state in the fourth tooth groove 212, and a second unlocked state embedded in the fourth tooth groove 212; a second rotating push block 25 in contact with the second limiting tooth 24 is provided in the first pivot portion 22 of the lower joint, and the second rotating push block 25 is connected to one end of the second unlocking cable; that is, one end of the second unlocking cable is connected to the cable positioning block 152, and the other end is connected to the second rotating push block 25; a guiding inclined surface is provided between the second rotating push block 25 and the first pivot portion 22 of the lower joint, through which the second rotating push block 25 moves axially relative to the first pivot portion 22 of the lower joint while rotating.

[0067] Reference Figures 1 to 14 After the cable positioning block 152 rotates, a pulling force is applied to the second unlocking cable, and the second unlocking cable drives the second rotating push block 25 to rotate. The second rotating push block 25 moves axially while rotating and drives the second limiting tooth 24 to move; the second limiting tooth 24 moves to disengage from the third tooth groove 221 and is embedded in the fourth tooth groove 212, and the second limiting tooth 24 switches from the second locking state to the second unlocking state; an elastic member is provided between the second limiting tooth 24 and the lower joint base 21, and the elastic force of the elastic member makes the second limiting tooth 24 have a tendency to move to the second locking state.

[0068] Reference Figures 1 to 14A first limiting groove 213 is provided in the lower joint base 21, and a limiting block 26 in contact with the second limiting tooth 24 is provided in the first limiting groove 213. A second limiting groove 231 cooperating with the limiting block 26 is provided on the second pivot portion 23 of the lower joint; the limiting block 26 can move axially, and includes a third locking state respectively embedded in the first limiting groove 213 and the second limiting groove 231, and a third unlocking state embedded in the first limiting groove 213; an elastic member is provided between the lower joint base 21 and the limiting block 26, and the elastic force of the elastic member makes the limiting block 26 have a tendency to move to the third locking state.

[0069] Reference Figures 1 to 14 In this embodiment, the second limiting tooth 24 contacts the limiting block 26, and the second limiting tooth 24 drives the limiting block 26 to move out of the second limiting groove 231 and be embedded in the first limiting groove 213, that is, the limiting block 26 switches from the third locked state to the third unlocked state.

[0070] Reference Figures 1 to 14 After the second limit tooth 24 switches to the second unlocked state, the first pivot part 22 of the lower joint can rotate around the first axis; after the limit block 26 switches to the third unlocked state, the second pivot part 23 of the lower joint can rotate around the second axis; wherein, the first axis is parallel to the second axis; a transmission plate 27 is hinged between the first pivot part 22 of the lower joint and the second pivot part 23 of the lower joint, and when the first pivot part 22 of the lower joint rotates, the second pivot part 23 of the lower joint is driven to rotate through the transmission plate 27, thereby realizing the automatic folding of the front wheel mechanism 41.

[0071] Reference Figures 1 to 14 In this embodiment, a limit block 26 is set between the second pivot part 23 of the lower joint and the lower joint base 21, which is beneficial to improving the stability of the second pivot part 23 of the lower joint and the front wheel mechanism 41; using the second limit tooth 24 as the unlocking switch of the limit block 26 can simplify the structure.

Claims

1. A baby carriage frame, characterized in that: It includes two lower folding joints, two upper folding joints, front wheel mechanisms respectively connected to the two lower folding joints, rear wheel mechanisms respectively connected to the two lower folding joints, two lower push rods and upper push rods respectively connected to the two upper folding joints; One end of the lower push rod is connected to the upper folding joint, and the other end is connected to the lower folding joint; The upper push rod is provided with a folding unlocking switch acting on the upper folding joint, and the upper folding joint is used to unlock the lower folding joint; Among them, the upper folding joint is unlocked by the folding unlocking switch, and then the upper push rod is rotated around the upper folding joint to realize the folding of the upper push rod and the lower push rod; After the upper push rod rotates, the lower folding joint is unlocked through the upper folding joint. The folded upper push rod and the lower push rod rotate around the lower folding joint under the action of gravity, and drive the front wheel mechanism to rotate around the lower folding joint, thereby achieving folding.

2. The baby carriage frame according to claim 1, characterized in that: A first unlocking cable is provided between the folding unlocking switch and the upper folding joint.

3. The baby carriage frame according to claim 2, characterized in that: A second unlocking cable is provided between the upper folding joint and the lower folding joint.

4. The baby carriage frame according to claim 1, characterized in that: Unlock the upper folding joint through the folding unlocking switch, and then rotate the upper push rod counterclockwise around the upper folding joint to fold the upper push rod and the lower push rod; After the upper push rod rotates, the lower folding joint is unlocked through the upper folding joint. The folded upper push rod and the lower push rod rotate clockwise around the lower folding joint under the action of gravity, and drive the front wheel mechanism to rotate counterclockwise around the lower folding joint, thereby achieving folding.

5. The baby carriage frame according to claim 3, characterized in that: The upper folding joint includes an upper joint pivot portion connected to the upper push rod, an upper joint base connected to the lower push rod, and a first position-limiting tooth arranged between the upper joint pivot portion and the upper joint base; the upper joint pivot portion and the upper joint base are respectively provided with a first tooth groove and a second tooth groove that cooperate with the first position-limiting tooth; A first rotating push block in contact with the first limiting tooth is provided in the upper joint pivot portion; one end of the first unlocking cable is connected to the first rotating push block, and the other end is connected to the folding unlocking switch; The first limiting tooth includes a first locking state in which the first tooth groove and the second tooth groove are respectively embedded, and a first unlocking state in which the second tooth groove is embedded; Among them, the folding unlocking switch drives the first rotating push block to rotate through the first unlocking cable. The first rotating push block moves axially while rotating and drives the first limiting tooth to move, so that the first limiting tooth switches from the first locking state to the first unlocking state, and the upper joint pivot part can rotate.

6. The baby carriage frame according to claim 5, characterized in that: A positioning ring is provided in the upper joint base, and a cable positioning block is provided on the positioning ring and extends axially into the first tooth groove. One end of the second unlocking cable is connected to the cable positioning block; a driving boss is provided in the first tooth groove to cooperate with the cable positioning block; The driving boss rotates along with the upper joint pivoting portion, and the driving boss rotates to contact the cable positioning block and drives the cable positioning block to rotate, and the cable positioning block drives the lower folding joint to unlock through the second unlocking cable.

7. The baby carriage frame according to claim 3, characterized in that: The lower folding joint includes a lower joint base connected to the rear wheel mechanism, a lower joint first pivot portion connected to the lower push rod, a lower joint second pivot portion connected to the front wheel mechanism, a transmission plate connected between the lower joint first pivot portion and the lower joint second pivot portion, and a second limiting tooth provided between the lower joint base and the lower joint first pivot portion; The first pivot portion of the lower joint and the lower joint base are respectively provided with a third tooth groove and a fourth tooth groove that cooperate with the second limiting tooth; The second limiting tooth includes a second locking state in which the second limiting tooth is respectively embedded in the third tooth groove and the fourth tooth groove, and a second unlocking state in which the second limiting tooth is embedded in the fourth tooth groove; A second rotating push block in contact with the second limiting tooth is provided in the first pivot portion of the lower joint, and the second rotating push block is connected to one end of the second unlocking cable; Among them, the second unlocking cable drives the second rotating push block to rotate, and the second rotating push block moves axially while rotating, and drives the second limiting tooth to move, so that the second limiting tooth switches from the second locking state to the second unlocking state; then, the first pivot part of the lower joint can rotate around the first axis, and the first pivot part of the lower joint drives the second pivot part of the lower joint to rotate around the second axis through the transmission plate.

8. The baby carriage frame according to claim 7, characterized in that: The lower joint base is provided with a first limiting groove, the first limiting groove is provided with a limiting block in contact with the second limiting tooth, and the second pivot portion of the lower joint is provided with a second limiting groove cooperating with the limiting block; The limiting block includes a third locking state respectively embedded in the first limiting groove and the second limiting groove, and a third unlocking state embedded in the first limiting groove; Wherein, when the second limiting tooth moves, it drives the limiting block to switch from the third locking state to the third unlocking state, so that the second pivoting part of the lower joint can rotate around the second axis.

9. The baby carriage frame according to claim 1, wherein: The baby carriage frame further includes a seat plate mechanism connected to the two lower folding joints, and a foot support bracket hinged to the seat plate mechanism; a seat plate locking assembly is provided between the seat plate mechanism and the lower folding joints; After the seat plate mechanism is unlocked by the seat plate locking assembly, the seat plate mechanism can be rotated and folded around the lower folding joint in the clockwise direction.

10. The baby carriage frame according to claim 9, characterized in that: The lower folding joint includes a third pivot part of the lower joint connected to the seat plate mechanism, and a lower joint base; the seat plate locking assembly includes a locking pin passed through the third pivot part of the lower joint, and the lower joint base is provided with a locking groove that cooperates with the locking pin; a third unlocking cable is provided between the foot support bracket and the locking pin; wherein, when the foot support bracket is rotated in the clockwise direction relative to the seat plate mechanism, the foot support bracket drives the locking pin to move out of the locking groove through the third unlocking cable, and the third pivot part of the lower joint can rotate.

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