Frame of baby carriage

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 mechanism is characterized by comprising a pivot joint used for achieving folding, a fixed push rod and a folding unlocking mechanism borne by the fixed push rod; during unlocking, the lifting handle is moved upwards, the lifting handle drives the unlocking block to move upwards in the fixed push rod through the inhaul cable, the unlocking block can drive the two limiting teeth to move at the same time, and the limiting teeth drive the limiting block to move. According to the utility model, the lifting handle is lifted upwards to unlock the pivoting joint, so that the operation is convenient, the collision noise cannot be generated, and the user experience is optimized.

Description

Technical Field

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

[0002] A stroller is a child's stroller, and its structure mainly includes a frame and a seat. In order to facilitate storage, the frame is usually foldable.

[0003] The existing Chinese patent with authorization announcement number CN220577337U discloses a folding structure of the frame of a baby stroller, which includes a seat assembly, a front wheel bracket, a rear wheel bracket, a push rod assembly and a linkage assembly. The linkage assembly includes a driving member and a link, and the push rod assembly includes a fixed rod and a movable rod; a second locking mechanism is provided between the driving member and the first connecting seat. When the second locking mechanism is locked, the driving member and the first connecting seat are rotationally limited. After the movable rod slides to the lower end of the fixed rod, it drives the second locking mechanism to unlock. After the second locking mechanism is unlocked, the driving member can rotate toward the rear wheel bracket.

[0004] In the above patent, the movable rod is slid downward to achieve unlocking, but this unlocking structure usually requires the movable rod to be pressed down forcefully during actual operation, and it will generate a lot of noise, affecting the user experience. Utility Model Content

[0005] In response to the shortcomings of the existing technology, the purpose of the present invention is to provide a baby stroller frame, which unlocks the pivot joint by pulling the handle upward. This is not only easy to operate, but also does not produce collision noise, thereby optimizing the user experience.

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

[0007] A baby stroller frame includes a pivot joint for folding, a fixed push rod, and a folding unlocking mechanism carried by the fixed push rod;

[0008] The pivot joint includes a fixed base, a push rod pivot portion, and two rear wheel pivot portions respectively provided at both ends of the fixed base; the fixed base includes two pivot fixing portions, the push rod pivot portion is located between the two pivot fixing portions, and a first rotating shaft is provided between the push rod pivot portion and the two pivot fixing portions;

[0009] The fixed base is provided with a positioning groove that cooperates with the rear wheel pivoting part, and a second rotating shaft is passed through the fixed base and the two rear wheel pivoting parts;

[0010] A limiting tooth capable of moving along the axial direction of the first rotating shaft is provided between the push rod pivot portion and the pivot fixing portion; the limiting tooth includes a first locking state in which the limiting tooth is engaged with the push rod pivot portion and the pivot fixing portion respectively, and a first unlocking state in which the limiting tooth is separated from the push rod pivot portion;

[0011] A limit block is provided in the pivot fixing portion and is movable along an axial direction perpendicular to the first rotating shaft; the limit block includes a second locked state in which the limit block extends into the positioning groove and engages with the rear wheel pivot portion, and a second unlocked state in which the limit block is separated from the rear wheel pivot portion;

[0012] The folding unlocking mechanism includes an unlocking block embedded in the bottom end of the fixed push rod, a pulling handle sleeved on the top end of the fixed push rod, and a pull rope arranged between the unlocking block and the pulling handle;

[0013] The bottom end of the fixed push rod is embedded in the push rod pivot portion, so that the unlocking block can act on the two limiting teeth at the same time;

[0014] When unlocking, the lifting handle is moved upward, and the lifting handle drives the unlocking block to move upward in the fixed push rod through the cable. The unlocking block can simultaneously drive two limit teeth to move, and the limit teeth drive the limit block to move; when the limit teeth move to the first unlocking state, the push rod pivot part can rotate around the first rotation axis; when the limit block moves to the second unlocking state, the rear wheel pivot part can rotate around the second rotation axis.

[0015] Furthermore, a transmission block in contact with the limiting tooth is provided in the pivot portion of the push rod, and the transmission block can move along the axial direction of the first rotating shaft; the two transmission blocks are respectively in contact with the unlocking block, and a first driving inclined surface is provided between the transmission block and the unlocking block;

[0016] A second driving inclined surface is provided between the limiting tooth and the limiting block.

[0017] Furthermore, the end face of the push rod pivot portion is provided with a first movable cavity cooperating with the transmission block, and the outer side wall of the push rod pivot portion extends inward to form a push rod installation cavity cooperating with the fixed push rod; the first movable cavity is connected to the push rod installation cavity, so that the unlocking block contacts the transmission block.

[0018] Furthermore, a second movable cavity cooperating with the limit block is provided in the pivot fixing portion, and a notch communicating with the second movable cavity is provided on the inner side wall of the positioning groove; the rear wheel pivot portion is embedded in the positioning groove, and a limit groove cooperating with the limit block is provided on the outer side wall of the rear wheel pivot portion; in the second locking state, the limit block passes through the notch and is embedded in the limit groove.

[0019] Furthermore, a first elastic member is provided between the limiting tooth and the pivot fixing portion, and the elastic force of the first elastic member causes the limiting tooth to have a tendency to move to the first locking state;

[0020] A second elastic member is provided between the limit block and the pivot fixing portion, and the elastic force of the second elastic member causes the limit block to have a tendency to move to the second locking state;

[0021] A fixing block is embedded in the bottom end of the fixed push rod, and a third elastic member is provided between the unlocking block and the fixing block; the elastic force of the third elastic member causes the unlocking block to have a tendency to move downward.

[0022] Furthermore, a first transmission assembly is provided between the push rod pivot and the rear wheel pivot; a clearance groove is provided on the outer side wall of the push rod pivot, and the first transmission assembly includes a transmission plate embedded in the clearance groove, and a first transmission shaft and a second transmission shaft are respectively passed through the two ends of the transmission plate; a first arc groove is provided on the inner side wall of the clearance groove to cooperate with the first transmission shaft; the second transmission shaft passes through the two rear wheel pivots respectively, and a second arc groove is provided on the inner end face of the positioning groove to cooperate with the second transmission shaft.

[0023] Furthermore, the pivot joint further comprises two seat pocket pivot portions respectively cooperating with the pivot fixing portions, a first rotating shaft is provided between the push rod pivot portion, the two seat pocket pivot portions and the two pivot fixing portions; a second transmission assembly is provided between the rear wheel pivot portion and the seat pocket pivot portion;

[0024] The baby stroller frame further includes a support rod, one end of which is connected to the fixed base, and the other end of which is connected to the front wheel mechanism;

[0025] The second transmission assembly includes a transmission sleeve sleeved on the support rod, a first connecting rod arranged between the transmission sleeve and the rear wheel pivot portion, and a second connecting rod arranged between the transmission sleeve and the seat pivot portion.

[0026] Furthermore, a circumferential limit assembly is provided between the seat pocket pivot portion and the pivot fixing portion; the circumferential limit assembly includes a shaft sleeve provided on the inner end surface of the seat pocket pivot portion, and a third arc groove provided on the pivot fixing portion and cooperating with the shaft sleeve;

[0027] A limiting shaft rod is provided between the two shaft sleeves, and a fourth arc groove is provided on the pivot portion of the push rod to cooperate with the limiting shaft rod;

[0028] When the baby stroller frame is in the unfolded state, the limiting shaft rod contacts the inner end surface of the fourth arc groove, and the push rod pivot portion supports the limiting shaft rod.

[0029] Furthermore, the baby stroller frame also includes a movable push rod embedded in the fixed push rod, and a telescopic unlocking mechanism is provided between the movable push rod and the fixed push rod; the telescopic unlocking mechanism includes an unlocking pin, and the unlocking pin can move along a length direction perpendicular to the movable push rod; the unlocking pin includes a third locking state in which it passes through the fixed push rod and the pulling handle at the same time, and a third unlocking state in which it is retracted into the fixed push rod.

[0030] Furthermore, the telescopic unlocking mechanism further includes an upper push block provided in the movable push rod, a push plate connected to the upper push block, and a lower push block connected to the push plate; a first button is provided at the top of the upper push block; an upper fixed block connected to the movable push rod is provided in the upper push block, a second button is provided in the upper fixed block, and the second button can be moved in a length direction perpendicular to the movable push rod; the second button includes a fourth locked state passing through the movable push rod, and a fourth unlocked state retracted in the movable push rod;

[0031] A lower fixed block is embedded in the bottom end of the movable push rod, and the unlocking pin is arranged in the lower fixed block; a driving shaft is arranged on the side wall of the unlocking pin, and a driving inclined groove cooperating with the driving shaft is arranged on the lower push block;

[0032] Elastic members are respectively provided between the second button and the upper fixing block, between the upper push block and the upper fixing block, and between the lower push block and the lower fixing block.

[0033] In summary, the present invention has the following beneficial effects:

[0034] 1. The folding unlocking mechanism of this utility model performs the unlocking action by pulling the lifting handle upwards. This is not only convenient to operate, but also does not produce collision noise, thus optimizing the user experience.

[0035] 2. The limiting teeth are used to drive the limit block to move and perform the unlocking action at the same time. That is, the limiting teeth serve as the unlocking mechanism of the limit block. In this way, there is no need to set up a separate unlocking mechanism for the limit block, thereby simplifying the structure and operation, reducing costs, and optimizing user experience;

[0036] 3. The unlocking pin not only locks the movable push rod and the fixed push rod, but also locks the lifting handle and the fixed push rod at the same time; the double locking function can simplify the structure and facilitate operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 The structure of the baby stroller frame in the embodiment is shown in FIG. Figure 1 ;

[0038] Figure 2 The structure of the baby stroller frame in the embodiment is shown in FIG. Figure 2 ;

[0039] Figure 3 The structure of the baby stroller frame in the embodiment is shown in FIG. Figure 3 ;

[0040] Figure 4 The structure of the pivot joint in the embodiment is shown in FIG. Figure 1 ;

[0041] Figure 5 The structure of the pivot joint in the embodiment is shown in FIG. Figure 2 ;

[0042] Figure 6 Schematic diagram of the structure of the push rod pivot portion, unlocking block, transmission block and limiting teeth in the embodiment;

[0043] Figure 7 Schematic diagram of the structure of the unlocking block, the transmission block, the limiting teeth and the limiting block in the embodiment;

[0044] Figure 8 Schematic diagram of the structure of the transmission block, the limiting teeth and the limiting block in the embodiment;

[0045] Figure 9 Schematic diagram of the structure of the fixed base, the rear wheel pivoting portion and the limit block in the embodiment;

[0046] Figure 10 Schematic diagram of the structure of the fixed base and the limit block in the embodiment;

[0047] Figure 11 2 is a schematic structural diagram of the first transmission assembly in the embodiment;

[0048] Figure 12 Schematic diagram of the structure of the folding unlocking mechanism, the push rod mechanism and the telescopic unlocking mechanism in the embodiment;

[0049] Figure 13 Schematic diagram of the structure of the fixed push rod, the unlocking block and the fixed block in the embodiment;

[0050] Figure 14 This is a structural diagram of the folding and unlocking mechanism in the embodiment;

[0051] Figure 15 Schematic diagram of the structure of the telescopic unlocking mechanism in the embodiment.

[0052] In the figure: 1, support rod; 2, front wheel mechanism; 3, pivot joint; 31, fixed base; 311, first sleeve; 312, pivot fixing portion; 313, positioning groove; 314, third arc groove; 315, second arc groove; 316, fifth arc groove; 32, push rod pivot portion; 321, second sleeve; 322, fourth arc groove; 323, clearance groove; 324, first arc groove; 33, seat pivot portion; 331, third sleeve; 332, shaft sleeve; 34, rear wheel pivot portion; 341, fourth sleeve; 342, limiting groove; 35, limiting tooth; 351, second driving inclined plane; 36, limiting block; 361, inclined plane groove; 3 7. Transmission block; 38. Transmission plate; 4. Rear wheel mechanism; 5. Seat support frame; 6. Push rod mechanism; 61. Fixed push rod; 62. Movable push rod; 63. Push rod handle; 71. Transmission sleeve; 72. First connecting rod; 73. Second connecting rod; 81. Unlocking block; 811. First driving inclined plane; 812. First cable slot; 82. Fixed block; 83. Pull handle; 831. Second cable slot; 91. Upper push block; 911. First button; 92. Upper fixed block; 93. Second button; 94. Push plate; 95. Lower push block; 951. Driving inclined slot; 96. Lower fixed block; 97. Unlocking pin; 98. Fixed sleeve. DETAILED DESCRIPTION

[0053] The present invention will be described in further detail below with reference to the accompanying drawings.

[0054] 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

[0055] A baby stroller frame, referring to Figures 1 to 15 It includes a support rod 1, one end of the support rod 1 is connected to the front wheel mechanism 2, and the other end is connected to the pivot joint 3; the pivot joint 3 is respectively connected to the rear wheel mechanism 4, the push rod mechanism 6 and the seat support frame 5; the baby stroller frame includes an unfolded state and a folded state, and folding is achieved by the pivot joint 3; the push rod mechanism 6 includes a fixed push rod 61, a movable push rod 62 telescopically embedded in the fixed push rod 61, and a push rod handle 63 provided at the top of the movable push rod 62; wherein, a folding unlocking mechanism acting on the pivot joint 3 is provided in the fixed push rod 61; a telescopic unlocking mechanism is provided between the movable push rod 62 and the fixed push rod 61; the pivot joint 3 is unlocked by the folding unlocking mechanism, thereby realizing the folding of the frame; the movable push rod 62 is unlocked by the telescopic unlocking mechanism, thereby realizing the contraction of the push rod mechanism 6.

[0056] Reference Figures 1 to 15In this embodiment, the pivot joint includes a fixed base 31, a push rod pivot portion 32, two seat pivot portions 33 respectively arranged at both ends of the fixed base 31, and two rear wheel pivot portions 34 respectively arranged at both ends of the fixed base 31; wherein, the fixed base 31 is provided with a first sleeve 311 connected to the support rod 1, the push rod pivot portion 32 is provided with a second sleeve 321 connected to the fixed push rod 61, the seat pivot portion 33 is provided with a third sleeve 331 connected to the seat support frame 5, and the rear wheel pivot portion 34 is provided with a fourth sleeve 341 connected to the rear wheel mechanism 4; the rear wheel pivot portion 34 is located below the seat pivot portion 33, and the rear wheel mechanism 4 is respectively connected to the two fourth sleeves 341.

[0057] Reference Figures 1 to 15 In this embodiment, the fixed base 31 includes a pivot fixing portion 312, the push rod pivot portion 32 is located between the two pivot fixing portions 312, and the two seat pocket pivot portions 33 are respectively connected to the two pivot fixing portions 312; that is, the seat pocket pivot portion 33 and the push rod pivot portion 32 are respectively located on both sides of the pivot fixing portion 312; wherein, a first rotating shaft (not shown in the drawings) is passed through the push rod pivot portion 32, the two seat pocket pivot portions 33 and the two pivot fixing portions 312; that is, the push rod pivot portion 32, the two seat pocket pivot portions 33 and the two pivot fixing portions 312 The rod pivot portion 32 and the seat pivot portion 33 can respectively rotate around the first rotation axis; the end of the fixed base 31 is provided with a positioning groove 313 that cooperates with the rear wheel pivot portion 34, and the two rear wheel pivot portions 34 are respectively embedded in the two positioning grooves 313; a second rotation axis (not shown in the drawings) is passed through the fixed base 31 and the two rear wheel pivot portions 34, that is, the rear wheel pivot portion 34 can rotate around the second rotation axis; wherein the first rotation axis is arranged parallel to the second rotation axis.

[0058] Reference Figures 1 to 15 The first locking state is achieved when the first and second locking portions 312 are engaged with each other, and the first and second unlocking states are achieved when the first and second locking portions 312 are engaged with each other. In other words, the end surfaces of the push rod pivot portion 32 and the pivot fixing portion 312 are respectively provided with tooth grooves that cooperate with the tooth grooves 35. In the first locking state, the tooth grooves 35 are respectively embedded in the two tooth grooves. The push rod pivot part 32, the limiting tooth 35 and the pivot fixing part 312 are locked in the circumferential direction, so that the push rod pivot part 32 cannot rotate; in the first release state, the limiting tooth 35 is only embedded in the tooth groove of the pivot fixing part 312 and is separated from the push rod pivot part 32, so that the push rod pivot part 32 can rotate; in this embodiment, a spring is provided between the pivot fixing part 312 and the limiting tooth 35, and the elastic force of the spring makes the limiting tooth 35 have a tendency to move axially to the first locking state.

[0059] Reference Figures 1 to 15In this embodiment, a limit block 36 that can move along the axial direction perpendicular to the first rotating shaft is provided in the pivot fixing portion 312; a second movable cavity that cooperates with the limit block 36 is provided in the pivot fixing portion 312, and a notch that communicates with the second movable cavity is provided on the inner side wall of the positioning groove 313; a spring is provided between the pivot fixing portion 312 and the limit block 36, and the elastic force of the spring enables the limit block 36 to pass through the notch and extend into the positioning groove 313; a limit block 36 that cooperates with the limit block 36 is provided on the outer side wall of the rear wheel pivot portion 34 Slot 342; then, the limit block 36 includes a second locking state in which it extends into the positioning slot 313 and engages with the rear wheel pivot portion 34, and a second unlocking state in which it is separated from the rear wheel pivot portion 34; in the second locking state, the limit block 36 is embedded in the limit slot 342, and the pivot fixing portion 312, the limit block 36 and the rear wheel pivot portion 34 are circumferentially locked, so that the rear wheel pivot portion 34 cannot rotate; in the second unlocking state, the limit block 36 is separated from the limit slot 342, and the rear wheel pivot portion 34 can rotate.

[0060] Reference Figures 1 to 15 In this embodiment, a second driving inclined surface 351 is provided on the limiting tooth 35, and a bevel groove 361 that cooperates with the second driving inclined surface 351 is opened on the limiting block 36; that is, when the limiting tooth 35 moves axially, the second driving inclined surface 351 of the limiting tooth 35 contacts the inclined inner wall of the bevel groove 361, thereby driving the limiting block 36 to overcome the elastic force of the spring to move, thereby realizing the separation of the limiting block 36 from the limiting groove 342.

[0061] Reference Figures 1 to 15 In this embodiment, the limiting tooth 35 is used to drive the limiting block 36 to move and perform the unlocking action at the same time, that is, the limiting tooth 35 serves as the unlocking mechanism of the limiting block 36. In this way, there is no need to set a separate unlocking mechanism for the limiting block 36, thereby simplifying the structure and operation, reducing costs, and optimizing user experience.

[0062] Reference Figures 1 to 15 In this embodiment, a transmission block 37 in contact with the limiting teeth 35 is provided in the push rod pivot portion 32, and the transmission block 37 can move along the axial direction of the first rotating shaft; that is, two transmission blocks 37 are provided in the push rod pivot portion 32, and the two transmission blocks 37 are in contact with the two limiting teeth 35 respectively.

[0063] Reference Figures 1 to 15In this embodiment, the folding unlocking mechanism includes an unlocking block 81 and a fixed block 82 embedded in the bottom end of the fixed push rod 61, a lifting handle 83 sleeved on the top of the fixed push rod 61, and a pull rope (not shown in the drawings) provided between the unlocking block 81 and the lifting handle 83; the side wall of the push rod pivot portion 32 is provided with a push rod installation cavity connected to the second sleeve 321, and the fixed push rod 61 is embedded in the push rod installation cavity through the second sleeve 321; the fixed block 82 is fixed relative to the fixed push rod 61 and the push rod pivot portion 32, while the unlocking block 81 can move up and down in the fixed push rod 61; a spring is provided between the unlocking block 81 and the fixed block 82, and the elastic force of the spring makes the unlocking block 81 tend to move downward; a fixed sleeve 98 is embedded in the top of the fixed push rod 61, and the fixed sleeve 98 is fixed relative to the fixed push rod 61; and the movable push rod 62 passes through the fixed sleeve 98.

[0064] Reference Figures 1 to 15 The lifting handle 83 is movably mounted on the top of the fixed push rod 61, and the inner end surface of the lifting handle 83 contacts the end surface of the fixed sleeve 98, thereby realizing the limitation along the length direction of the fixed push rod 61; the unlocking block 81 and the lifting handle 83 are respectively provided with a first cable groove 812 and a second cable groove 831 that cooperate with the two ends of the cable. The cable is located on the inner side of the fixed push rod 61, and the corresponding parts are provided with a wire groove that cooperates with the cable; that is, by moving the lifting handle 83 upward, the unlocking block 81 can be driven to move upward through the cable.

[0065] Reference Figures 1 to 15 The end face of the push rod pivot portion 32 is provided with a first active cavity that cooperates with the transmission block 37, and the first active cavity is connected to the push rod mounting cavity, so that the unlocking block 81 contacts the transmission block 37; in this embodiment, the unlocking block 81 contacts the two transmission blocks 37 at the same time, and a first driving inclined surface 811 is provided between the unlocking block 81 and the transmission block 37; that is, when the unlocking block 81 moves upward, the two first driving inclined surfaces 811 respectively drive the two transmission blocks 37 to move axially.

[0066] Reference Figures 1 to 15 When unlocking, the lifting handle 83 is moved upward, and the lifting handle 83 drives the unlocking block 81 to move upward in the fixed push rod 61 through the cable. The unlocking block 81 can simultaneously drive the two transmission blocks 37 to move, and the transmission block 37 pushes the limit tooth 35 to move, and the limit tooth 35 drives the limit block 36 to move through the second driving inclined surface 351; when the limit tooth 35 moves to the first unlocking state, the push rod pivot part 32 can rotate around the first rotation axis; when the limit block 36 moves to the second unlocking state, the rear wheel pivot part 34 can rotate around the second rotation axis.

[0067] Reference Figures 1 to 15In this embodiment, a transmission block 37 is arranged between the unlocking block 81 and the limiting tooth 35, which can facilitate processing and assembly.

[0068] Reference Figures 1 to 15 In this embodiment, a first transmission assembly is provided between the push rod pivot portion 32 and the rear wheel pivot portion 34, and the push rod pivot portion 32 drives the rear wheel pivot portion 34 to rotate through the first transmission assembly; a give way groove 323 is provided on the outer wall of the push rod pivot portion 32, and the first transmission assembly includes a transmission plate 38 embedded in the give way groove 323, and the two ends of the transmission plate 38 are respectively penetrated by a first transmission shaft and a second transmission shaft (not shown in the drawings); the inner side wall of the give way groove 323 is provided with a first arc groove 324 that cooperates with the first transmission shaft; the second transmission shaft passes through the two rear wheel pivot portions 34 respectively, and the inner end surface of the positioning groove 313 is provided with a second arc groove 315 that cooperates with the second transmission shaft; an axial hole that cooperates with the second transmission shaft is provided on the rear wheel pivot portion 34, so that the second transmission shaft can drive the rear wheel pivot portion 34 to rotate around the second rotation.

[0069] Reference Figures 1 to 15 When the push rod pivot portion 32 rotates, the rear wheel pivot portion 34 is driven to rotate through the transmission plate 38, the first transmission shaft and the second rotation shaft, thereby realizing the linkage between the push rod pivot portion 32 and the rear wheel pivot portion 34; the embedded transmission plate 38 is used for transmission, the structure is simple and clever, and it is easy to arrange and occupies a small space; in this embodiment, circumferential limit assemblies are respectively provided between the push rod pivot portion 32 and the fixed base 31, and between the rear wheel pivot portion 34 and the positioning groove 313, so as to improve stability; the circumferential limit assemblies can adopt a variety of structures, which are not limited here.

[0070] Reference Figures 1 to 15 In this embodiment, a second transmission assembly is provided between the rear wheel pivot portion 34 and the seat pocket pivot portion 33, and the rear wheel pivot portion 34 drives the seat pocket pivot portion 33 to rotate through the second transmission assembly; the second transmission assembly includes a transmission sleeve 71 sleeved on the support rod 1, a first connecting rod 72 provided between the transmission sleeve 71 and the rear wheel pivot portion 34, and a second connecting rod 73 provided between the transmission sleeve 71 and the seat pocket pivot portion 33; when the rear wheel pivot portion 34 rotates, the transmission sleeve 71 is driven to slide on the support rod 1 through the first connecting rod 72, and the transmission sleeve 71 drives the seat pocket pivot portion 33 to rotate through the second connecting rod 73.

[0071] Reference Figures 1 to 15In this embodiment, the linkage between the push rod pivot part 32 and the rear wheel pivot part 34 is realized by the first transmission component, and the linkage between the rear wheel pivot part 34 and the seat pocket pivot part 33 is realized by the second transmission component. Then, in the unlocked state, the push rod mechanism 6 is rotated downward to drive the rear wheel mechanism 4 and the seat pocket support frame 5 to rotate, thereby realizing the folding of the frame, which is convenient to operate; in this embodiment, the transmission sleeve 71 is sleeved on the support rod 1, which not only has good transmission stability, but also can improve the structural strength and stability.

[0072] Reference Figures 1 to 15 The circumferential limiter assembly is provided between the seat pivot portion 33 and the pivot fixing portion 312 in this embodiment; the circumferential limiter assembly includes a sleeve 332 provided on the inner end surface of the seat pivot portion 33, and a third arc groove 314 provided on the pivot fixing portion 312 and cooperating with the sleeve 332; the sleeve 332 is embedded in the third arc groove 314, thereby achieving the circumferential limit between the seat pivot portion 33 and the pivot fixing portion 312; a limiter assembly is provided between the two sleeves 332 The shaft rod (not shown in the drawings) is provided with a fourth arc groove 322 on the push rod pivot portion 32 for cooperating with the limit shaft rod, and the pivot fixing portion 312 is provided with a fifth arc groove 316 for cooperating with the limit shaft rod; when the frame is in the unfolded state, the limit shaft rod contacts the inner end surface of the fourth arc groove 322, and the push rod pivot portion 32 supports the limit shaft rod, that is, the push rod pivot portion 32 supports the seat pocket pivot portion 33, thereby improving the stability and safety of the frame.

[0073] Reference Figures 1 to 15 In this embodiment, the telescopic unlocking mechanism includes an upper push block 91 arranged in the movable push rod 62, a push piece 94 connected to the upper push block 91, and a lower push block 95 connected to the push piece 94; a first button 911 is provided at the top of the upper push block 91; an upper fixed block 92 connected to the movable push rod 62 is provided in the upper push block 91, and a second button 93 is provided in the upper fixed block 92, and the second button 93 can be moved in a length direction perpendicular to the movable push rod 62; the first button 911 passes through the top of the push rod grip 63, and the second button 93 passes through the side wall of the push rod grip 63, so as to facilitate operation.

[0074] Reference Figures 1 to 15 A lower fixed block 96 is embedded in the bottom end of the movable push rod 62, and an unlocking pin 97 is provided in the lower fixed block 96. The unlocking pin 97 can move in a length direction perpendicular to the movable push rod 62; a driving shaft is provided on the side wall of the unlocking pin 97, and the lower push block 95 is embedded in the lower fixed block 96, and a driving inclined groove 951 that cooperates with the driving shaft is provided on the lower push block 95; springs are respectively provided between the second button 93 and the upper fixed block 92, between the upper push block 91 and the upper fixed block 92, and between the lower push block 95 and the lower fixed block 96.

[0075] Reference Figures 1 to 15 In this embodiment, the unlocking pin 97 includes a third locking state in which it passes through the fixed push rod 61 and the lifting handle 83 at the same time, and a third unlocking state in which it is retracted into the fixed push rod 61; the second button 93 includes a fourth locking state in which it passes through the movable push rod 62, and a fourth unlocking state in which it is retracted into the movable push rod 62.

[0076] Reference Figures 1 to 15 In this embodiment, the unlocking pin 97 not only realizes the locking between the movable push rod 62 and the fixed push rod 61, but also realizes the locking between the pulling handle 83 and the fixed push rod 61; the double locking function can simplify the structure and facilitate operation.

[0077] Reference Figures 1 to 15 , press the second button 93 to the fourth unlocking state, and then press the first button 911 downward, the upper push block 91, the push piece 94 and the lower push block 95 move downward, and the lower push block 95 drives the unlocking pin 97 to retract inward to the third unlocking state through the driving inclined slot 951, thereby being able to push the movable push rod 62 downward to the retracted state; the lower fixed block 96 moves to contact the fixed block 82 at the bottom end of the fixed push rod 61. At this time, there is a gap between the lower fixed block 96 and the unlocking block 81 for the movement of the unlocking block 81; then, pull the lifting handle 83 upward, and drive the unlocking block 81 upward through the cable, thereby unlocking the pivot joint 3, and then the frame can be folded.

[0078] Reference Figures 1 to 15 The folding unlocking mechanism of this embodiment performs the unlocking action by pulling the lifting handle 83 upward, which is not only convenient to operate but also does not produce collision noise, thereby optimizing the user experience; the limiting tooth 35 is used to achieve locking between the push rod pivot 32 and the fixed base 31, and the limiting block 36 is used to achieve locking between the rear wheel pivot 34 and the fixed base 31. The rear wheel pivot 34 and the seat pivot 33 are locked through the second transmission assembly, thereby ensuring the stability and safety of the frame when it is unfolded.

Claims

1. A baby stroller frame, characterized by: It comprises a pivot joint for realizing folding, a fixed push rod and a folding unlocking mechanism carried by the fixed push rod; The pivot joint includes a fixed base, a push rod pivot portion, and two rear wheel pivot portions respectively provided at both ends of the fixed base; The fixed base includes two pivot fixing parts, the push rod pivot part is located between the two pivot fixing parts, and a first rotating shaft is provided between the push rod pivot part and the two pivot fixing parts; The fixed base is provided with a positioning groove that cooperates with the rear wheel pivoting part, and a second rotating shaft is passed through the fixed base and the two rear wheel pivoting parts; A limiting tooth capable of moving along the axial direction of the first rotating shaft is provided between the push rod pivot portion and the pivot fixing portion; the limiting tooth includes a first locking state in which the limiting tooth is engaged with the push rod pivot portion and the pivot fixing portion respectively, and a first unlocking state in which the limiting tooth is separated from the push rod pivot portion; A limit block is provided in the pivot fixing portion and is movable along an axial direction perpendicular to the first rotating shaft; the limit block includes a second locked state in which the limit block extends into the positioning groove and engages with the rear wheel pivot portion, and a second unlocked state in which the limit block is separated from the rear wheel pivot portion; The folding unlocking mechanism includes an unlocking block embedded in the bottom end of the fixed push rod, a pulling handle sleeved on the top end of the fixed push rod, and a pull rope arranged between the unlocking block and the pulling handle; The bottom end of the fixed push rod is embedded in the push rod pivot portion, so that the unlocking block can act on the two limiting teeth at the same time; When unlocking, the lifting handle is moved upward, and the lifting handle drives the unlocking block to move upward in the fixed push rod through the cable, and the unlocking block can simultaneously drive the two limiting teeth to move, and the limiting teeth drive the limiting block to move; when the limiting teeth move to the first unlocking state, the push rod pivot portion can rotate around the first rotation axis; When the limiting block moves to the second unlocking state, the rear wheel pivoting portion can rotate around the second rotating axis.

2. The baby stroller frame according to claim 1, characterized in that: A transmission block in contact with the limiting tooth is provided in the pivot portion of the push rod, and the transmission block can move along the axial direction of the first rotating shaft; the two transmission blocks are respectively in contact with the unlocking block, and a first driving inclined surface is provided between the transmission block and the unlocking block; A second driving inclined surface is provided between the limiting tooth and the limiting block.

3. The baby stroller frame according to claim 2, characterized in that: The end face of the push rod pivot portion is provided with a first movable cavity cooperating with the transmission block, and the outer side wall of the push rod pivot portion extends inward to form a push rod installation cavity cooperating with the fixed push rod; the first movable cavity is connected to the push rod installation cavity, so that the unlocking block contacts the transmission block.

4. The baby stroller frame according to claim 1, characterized in that: A second movable cavity cooperating with the limit block is provided in the pivot fixing portion, and a notch communicating with the second movable cavity is provided on the inner side wall of the positioning groove; the rear wheel pivot portion is embedded in the positioning groove, and a limit groove cooperating with the limit block is provided on the outer side wall of the rear wheel pivot portion; in the second locking state, the limit block passes through the notch and is embedded in the limit groove.

5. The baby stroller frame according to claim 1, characterized in that: A first elastic member is provided between the limiting tooth and the pivot fixing portion, and the elastic force of the first elastic member causes the limiting tooth to have a tendency to move to the first locking state; A second elastic member is provided between the limit block and the pivot fixing portion, and the elastic force of the second elastic member causes the limit block to have a tendency to move to the second locking state; A fixing block is embedded in the bottom end of the fixed push rod, and a third elastic member is provided between the unlocking block and the fixing block; the elastic force of the third elastic member causes the unlocking block to have a tendency to move downward.

6. The baby stroller frame according to claim 1, characterized in that: A first transmission assembly is provided between the push rod pivot and the rear wheel pivot; a clearance groove is provided on the outer side wall of the push rod pivot, and the first transmission assembly includes a transmission plate embedded in the clearance groove, and a first transmission shaft and a second transmission shaft are respectively passed through the two ends of the transmission plate; a first arc groove is provided on the inner side wall of the clearance groove to cooperate with the first transmission shaft; the second transmission shaft passes through the two rear wheel pivots respectively, and a second arc groove is provided on the inner end surface of the positioning groove to cooperate with the second transmission shaft.

7. The baby stroller frame according to claim 1, characterized in that: The pivot joint further includes two seat pocket pivot portions respectively cooperating with the pivot fixing portions, a first rotating shaft is provided between the push rod pivot portion, the two seat pocket pivot portions and the two pivot fixing portions; a second transmission assembly is provided between the rear wheel pivot portion and the seat pocket pivot portion; The baby stroller frame further includes a support rod, one end of which is connected to the fixed base, and the other end of which is connected to the front wheel mechanism; The second transmission assembly includes a transmission sleeve sleeved on the support rod, a first connecting rod arranged between the transmission sleeve and the rear wheel pivot portion, and a second connecting rod arranged between the transmission sleeve and the seat pivot portion.

8. The baby stroller frame according to claim 7, characterized in that: A circumferential limit assembly is provided between the seat pocket pivot portion and the pivot fixing portion; the circumferential limit assembly comprises a shaft sleeve provided on the inner end surface of the seat pocket pivot portion, and a third arc groove provided on the pivot fixing portion and cooperating with the shaft sleeve; A limiting shaft rod is provided between the two shaft sleeves, and a fourth arc groove is provided on the pivot portion of the push rod to cooperate with the limiting shaft rod; When the baby stroller frame is in the unfolded state, the limiting shaft rod contacts the inner end surface of the fourth arc groove, and the push rod pivot portion supports the limiting shaft rod.

9. The baby stroller frame according to claim 1, characterized in that: The baby stroller frame also includes a movable push rod embedded in the fixed push rod, and a telescopic unlocking mechanism is provided between the movable push rod and the fixed push rod; the telescopic unlocking mechanism includes an unlocking pin, which can move along a length direction perpendicular to the movable push rod; the unlocking pin includes a third locking state in which it passes through the fixed push rod and the pulling handle at the same time, and a third unlocking state in which it is retracted into the fixed push rod.

10. The baby stroller frame according to claim 9, characterized in that: The telescopic unlocking mechanism further includes an upper push block provided in the movable push rod, a push plate connected to the upper push block, and a lower push block connected to the push plate; a first button is provided at the top of the upper push block; an upper fixed block connected to the movable push rod is provided in the upper push block, a second button is provided in the upper fixed block, and the second button can be moved in a length direction perpendicular to the movable push rod; the second button includes a fourth locking state that passes through the movable push rod and a fourth unlocking state that is retracted in the movable push rod; A lower fixed block is embedded in the bottom end of the movable push rod, and the unlocking pin is arranged in the lower fixed block; a driving shaft is arranged on the side wall of the unlocking pin, and a driving inclined groove cooperating with the driving shaft is arranged on the lower push block; Elastic members are respectively provided between the second button and the upper fixing block, between the upper push block and the upper fixing block, and between the lower push block and the lower fixing block.

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