One-button linkage backrest retraction mechanism and backrest retraction method

Abstract

The application discloses a one-key linkage backrest folding mechanism and relates to the technical field of folding stroller equipment. The one-key linkage backrest folding mechanism comprises a stroller front wheel, a stroller rear wheel, a front wheel connecting rod, a rear wheel connecting rod, a first pushing rod, a second pushing rod, a first linkage supporting rod, a supporting backrest and a backrest locking part. When the whole equipment is folded, a user only needs to open the lock of the whole equipment, then pushes the first pushing rod to be folded, so that the second pushing rod, the front wheel connecting rod, the first linkage supporting rod and the second linkage supporting rod are simultaneously folded towards the position of the rear wheel connecting rod, the first transmission steel cable drives the backrest locking part to be released under the pulling of the driving supporting rod, at this time, the supporting backrest is in a relaxed state and rotates towards the position of the rear wheel connecting rod under the pulling of the first transmission steel cable, so that the whole stroller can be folded in one step.

Description

Technical Field

[0001] The present invention relates to the technical field of folding stroller equipment, and in particular to a one-button linkage backrest folding mechanism and a backrest folding method thereof. Background Art

[0002] In addition to being a baby's favorite means of transportation for walking, a baby stroller is also a necessity for mothers when taking their babies shopping. However, baby strollers can be divided into many types according to the baby's growth and usage.

[0003] In order to facilitate users to move around normally in areas that are not suitable for carts, various manufacturers provide a variety of different foldable carts.

[0004] The patent with publication number CN106004965B in the prior art provides a foldable stroller, comprising a main body and a front wheel frame arranged on the main body, the main body comprising a front frame, a push rod, a rear frame and a rear wheel frame, the push rod having a first connecting rod section, the rear wheel frame having a second connecting rod section, the front frame, the first connecting rod section, the rear frame and the second connecting rod section being pivotally connected end to end to form a foldable connecting rod mechanism. The patent can realize the folding and storage of the stroller quickly, but the backrest of the stroller cannot be automatically bent during the folding and storage process of the stroller. Therefore, the user needs to adjust the backrest position of the stroller after the stroller is folded, thereby increasing the folding process of the stroller, and because the user may still hold the child with one hand when folding the stroller, the difficulty of folding the stroller is further increased. Summary of the Invention

[0005] The present invention provides a one-button linkage backrest folding mechanism to solve the technical problem in the prior art that the backrest cannot be automatically folded during the folding process of the trolley.

[0006] The one-button linkage backrest retracting mechanism includes a front wheel of the cart, a rear wheel of the cart, a front wheel connecting rod, a rear wheel connecting rod, a first push rod, a second push rod, a first linkage support rod, a support backrest and a backrest locking member. The front wheel of the cart, the front wheel connecting rod, the rear wheel of the cart and the rear wheel connecting rod are each provided with two, and the two front wheels of the cart are respectively connected to the bottom ends of the two front wheel connecting rods, and the two rear wheels of the cart are connected to the bottom ends of the two rear wheel connecting rods. The two front wheel connecting rods and the two rear wheel connecting rods are arranged on both sides and the top of the single front wheel connecting rod on the same side is connected to the top of the single rear wheel connecting rod. The first push rod is U-shaped, and the second push rod is provided with Two, one end of the two second push rods are respectively connected to the two sides of the first push rod, and the other side of the two second push rods are connected to the two front wheel connecting rods, the first link support rods are provided with two, the two first link support rods are respectively connected to the second push rods and the rear wheel connecting rods on both sides, the backrest locking parts are provided with two, the two backrest locking parts are respectively arranged on the first link support rods on both sides, and the two sides of the supporting backrest are respectively fixedly installed on the two backrest locking parts, a first transmission steel cable is respectively provided in the two backrest locking parts, a driving support rod is provided between the two second push rods, and the two first transmission steel cables are limited on the driving support rod.

[0007] Furthermore, the backrest locking member consists of a locking bottom shell, a locking gear, a locking mounting rod, a locking spring and a locking shell, the locking bottom shell is installed on the first linkage support rod, the interior of the locking bottom shell is provided with a circle of tooth grooves, the locking mounting rod is inserted into the locking bottom shell, the locking gear is sleeved on the locking mounting rod, the locking shell and the locking bottom shell cover each other and wrap the locking gear inside, the support backrest is fixedly connected to the locking shell, the inner wall of the locking shell is provided with a circle of movable grooves, the locking gear is located between the locking bottom shell and the locking shell, and the teeth of a circle of teeth on the locking gear are located in the tooth grooves inside the locking bottom shell and the movable groove on the locking shell, the locking spring is arranged between the locking gear and the locking shell, and the first transmission cable passes through the locking shell and is transmission-connected to the locking gear.

[0008] Furthermore, a manual adjustment member is provided on the support backrest, and two second transmission steel cables are connected to the manual adjustment member for transmission, and the other ends of the two second transmission steel cables are respectively fixedly connected to the locking gears inside the backrest locking members on both sides.

[0009] Furthermore, it also includes a second linkage support rod, which is provided with two second linkage support rods. One end of the two second linkage support rods is respectively connected to the top of the two rear wheel connecting rods, and the other end of the two second linkage support rods is respectively connected to both sides of the first push rod.

[0010] Furthermore, connecting foot plates are provided at the intersection of the front wheel connecting rods and the rear wheel connecting rods on both sides, a table board connecting rod is provided in the middle of the connecting foot plates, the bottom of the table board connecting rod is connected to the connecting foot plates, and the top of the table board connecting rod is provided with a table board placement.

[0011] Furthermore, a cup holder is provided at the side end of the first push rod.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] When the stroller is folded, the user only needs to unlock the entire device and then push the first push rod to bend it, so that the second push rod, the front wheel connecting rod, the first linkage support rod and the second linkage support rod are folded toward the position of the rear wheel connecting rod at the same time, and the first transmission cable drives the backrest locking member to be released under the pulling of the driving support rod. At this time, the support backrest is in a relaxed state and rotates toward the position of the rear wheel connecting rod under the pulling of the first transmission cable, thereby realizing the folding of the entire stroller in one step; on the contrary, when the user opens the device as a whole, the first transmission cable loses its tension, and under the action of the locking spring, the locking gear is pushed into the inside of the locking bottom shell, so that the support backrest is in a locked state, so as to provide support for the back of the child in the stroller, thereby effectively solving the technical problem that the stroller in the prior art cannot automatically fold the backrest during the folding process.

[0014] Secondly, the present invention provides a manual adjustment piece on the support backrest. When the user turns the manual adjustment piece, the second transmission cable is driven to pull up, so that the locking gears on both sides move inward, so that the locking gears on both sides lose coordination with the locking bottom shells on both sides. At this time, the user can adjust the setting angle of the support backrest according to needs. When the adjustment of the support backrest angle is completed, the manual adjustment piece is released, and the locking gear is pushed to the locking bottom shell under the action of the locking spring, so that the locking bottom shell and the locking outer shell are in a fixed connection state. At this time, the support backrest can provide sufficient supporting force to support the back of the child in the stroller. Therefore, the present invention can adjust the angle of the support backrest at multiple angles for children of different heights, which greatly improves the practicality and comfort of use of the present invention.

[0015] Thirdly, the present invention provides a second linkage support rod at the top of the rear wheel connecting rod on both sides, and the second linkage support rod can limit the positions of the front wheel connecting rod, the rear wheel connecting rod and the first push rod, so that the device as a whole can generate a larger supporting force to support the heavy objects inside the cart, and when the device is folded, the user only needs to bend the first push rod to fold the front wheel connecting rod through the linkage support member, thereby reducing the folding steps and increasing the convenience of use of the present invention.

[0016] Fourthly, the present invention provides a connecting foot plate at the intersection of the front wheel connecting rod and the rear wheel connecting rod. The connecting foot plate enables children on the stroller to exercise their feet, which increases the comfort of the present invention. In addition, the connecting foot plate can increase the connection strength of the front wheel connecting rod and the rear wheel connecting rod on both sides.

[0017] Fifthly, the present invention provides a table board connecting rod in the middle of the connecting footboard, the bottom of the table board connecting rod is connected to the connecting footboard, and the top of the table board connecting rod is provided with a placing table board, and some sundries can be placed on the provided placing table board. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0020] Figure 2 is a side view of the present invention;

[0021] Figure 3 Schematic diagram of the matching structure of the support backrest and the backrest locking member in the present invention;

[0022] Figure 4 This is a schematic diagram of the first angle split structure of the backrest locking member of the present invention;

[0023] Figure 5 This is a schematic diagram of the second angle split structure of the backrest locking member in the present invention;

[0024] Figure numerals: cart front wheel 1, cart rear wheel 2, front wheel connecting rod 3, rear wheel connecting rod 4, second linkage support rod 41, connecting foot plate 42, table board connecting rod 43, placing table board 44, first push rod 5, cup holder 51, second push rod 6, driving support rod 61, first linkage support rod 7, supporting backrest 8, manual adjustment part 81, second transmission steel cable 811, backrest locking part 9, first transmission steel cable 91, locking bottom shell 92, locking gear 93, locking mounting rod 94, locking spring 95, locking shell 96. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention.

[0027] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0030] Example 1

[0031] A one-button linkage backrest retraction mechanism includes a cart front wheel 1, a cart rear wheel 2, a front wheel connecting rod 3, a rear wheel connecting rod 4, a first push rod 5, a second push rod 6, a first linkage support rod 7, a support backrest 8 and a backrest locking member 9. The cart front wheel 1, the front wheel connecting rod 3, the cart rear wheel 2 and the rear wheel connecting rod 4 are each provided with two, and the two cart front wheels 1 are respectively connected to the bottom ends of the two front wheel connecting rods 3, and the two cart rear wheels 2 are connected to the bottom ends of the two rear wheel connecting rods 4. The two front wheel connecting rods 3 and the two rear wheel connecting rods 4 are arranged on both sides and are a single member on the same side. The top of the front wheel connecting rod 3 is connected to the top of the single rear wheel connecting rod 4. When the device is folded and stored, the front wheel connecting rod 3 can be rotated toward the direction of the rear wheel connecting rod 4 to achieve folding. The first push rod 5 is set in a U shape, and two second push rods 6 are provided. One end of the two second push rods 6 is connected to the two sides of the first push rod 5 respectively, and the other sides of the two second push rods 6 are connected to the two front wheel connecting rods 3. When the device is folded and stored, the first push rod 5 and the second push rod 6 can be rotated and folded with the connection point as the center of the circle, and move toward the rear wheel connecting rod 4. The two backrest locks 9 are respectively arranged on the first linkage support rods 7 on both sides, and the two sides of the support backrest 8 are respectively fixedly mounted on the two backrest locks 9. A first transmission steel cable 91 is respectively provided in the two backrest locks 9, and a driving support rod 61 is provided between the two second push rods 6. The two first transmission steel cables 91 are limited to the driving support rod 6. 1, when the device is folded, the first push rod 5 and the second push rod 6 are folded against each other, and the driving support rod 61 on the two second push rods 6 moves outward, and the driving support rod 61 pulls the first transmission steel cable 91 to trigger the backrest locking member 9, so that the support backrest 8 loses its lock and drives the support backrest 8 to fold during the folding process. During the folding process, the present invention uses the first transmission steel cable 91 to trigger the backrest locking member 9 to make the support backrest 8 lose its lock and automatically fold, so that the entire trolley can be folded in one step, further increasing the folding convenience of the device.

[0032] Preferably, the backrest locking member 9 is composed of a locking bottom shell 92, a locking gear 93, a locking mounting rod 94, a locking spring 95 and a locking shell 96. The locking bottom shell 92 is installed on the first linkage support rod 7. The interior of the locking bottom shell 92 is provided with a circle of teeth. The locking mounting rod 94 is inserted into the locking bottom shell 92. The locking gear 93 is sleeved on the locking mounting rod 94. The locking shell 96 and the locking bottom shell 92 cover each other and wrap the locking gear 93 inside. The support backrest 8 is fixedly connected to the lock The locking housing 96 has a circle of movable grooves on its inner wall. The locking gear 93 is located between the locking bottom housing 92 and the locking housing 96, and the teeth of a circle of teeth on the locking gear 93 are located in the tooth grooves on the inner side of the locking bottom housing 92 and the movable grooves on the locking housing 96. The locking gear 93 can move laterally between the locking bottom housing 92 and the locking housing 96. The locking spring 95 is provided between the locking gear 93 and the locking housing 96. The locking spring 95 provided can move the locking gear 93 toward the locking bottom housing 92. The bottom shell 92 is pushed out, the first transmission cable 91 passes through the locking shell 96 and is connected to the locking gear 93. When the device is folded and stored, the first transmission cable 91 is pulled, and the locking gear 93 is pulled by the first transmission cable 91 to make it lose the match with the internal tooth groove of the locking bottom shell 92. When the device is in the expanded state, the locking gear 93 is pushed between the locking bottom shell 92 and the locking shell 96 under the action of the locking spring 95. The teeth on the locking gear 93 are in the tooth groove inside the locking bottom shell 92 and the locking shell 96. In the internal interactive groove, the locking bottom shell 92 is fixedly connected to the locking outer shell 96, so that the support backrest 8 is in a fixed state. When the device is folded, the first transmission steel cable 91 is pulled, and the locking gear 93 is pulled inward by the first transmission steel cable 91, so that the locking gear 93 loses the cooperation with the internal tooth groove of the locking bottom shell 92. At this time, the locking bottom shell 92 and the locking outer shell 96 are in an active connection state, so the support backrest 8 installed on the locking outer shell 96 can be rotated in conjunction to achieve folding.

[0033] Preferably, the support backrest 8 is provided with a manual adjustment member 81, and the manual adjustment member 81 is connected to two second transmission cables 811, and the other ends of the two second transmission cables 811 are respectively fixedly connected to the locking gears 93 inside the backrest locking members 9 on both sides. When the user pries the manual adjustment member 81, the second transmission cables 811 are driven to pull up, so that the locking gears 93 on both sides are moved inward, so that the locking gears 93 on both sides lose their match with the locking bottom shells 92 on both sides. At this time, the user can adjust the position of the backrest 8 according to the needs The setting angle of the support backrest 8 is adjusted. When the adjustment of the angle of the support backrest 8 is completed, the manual adjustment member 81 is released, and the locking gear 93 is pushed to the locking bottom shell 92 under the action of the locking spring 95, so that the locking bottom shell 92 and the locking outer shell 96 are in a fixed connection state. At this time, the support backrest 8 can provide sufficient supporting force to support the back of the child in the stroller. Therefore, the present invention can adjust the angle of the support backrest 8 at multiple angles for children of different heights, which greatly improves the practicality and comfort of use of the present invention.

[0034] Preferably, the present invention further provides a second linkage support rod 41, and two second linkage support rods 41 are provided, one end of the two second linkage support rods 41 is respectively connected to the top of the two rear wheel connecting rods 4, and the other end of the two second linkage support rods 41 is respectively connected to the two sides of the first push rod 5. When the device is in the unfolded state, the two second linkage support rods 41 can limit the positions of the front wheel connecting rod 3, the rear wheel connecting rod 4 and the first push rod 5, so that the device as a whole generates a larger supporting force to support the heavy objects inside the cart, and when the device is folded, the user only needs to bend the first push rod 5 to drive the front wheel connecting rod 3 to fold through the linkage support, thereby reducing the folding steps and increasing the convenience of use of the present invention.

[0035] Preferably, connecting foot plates 42 are provided at the intersection of the front wheel connecting rods 3 and the rear wheel connecting rods 4 on both sides. The connecting foot plates 42 can enable children on the stroller to exercise their feet, which increases the comfort of the present invention. In addition, the connecting foot plates 42 can increase the connection strength between the front wheel connecting rods 3 and the rear wheel connecting rods 4 on both sides, further improving the stability of the present invention. A table board connecting rod 43 is provided in the middle of the connecting foot plates 42, and the bottom of the table board connecting rod 43 is connected to the connecting foot plates 42. A placement table board 44 is provided on the top of the table board connecting rod 43. Some sundries can be placed on the placement table board 44, thereby increasing the practicality and convenience of the present invention.

[0036] Preferably, a cup holder 51 is provided at the side end of the first push rod 5 , and the user can place the cup in the cup holder 51 at the side end of the first push rod 5 , thereby increasing the convenience of the user in taking the cup.

[0037] Example 2

[0038] The method for retracting a backrest with a one-button linkage backrest retraction mechanism comprises the following steps:

[0039] Step 1. When the user needs to fold the entire device in half during use, the user only needs to unlock the entire device and then push the first push rod 5 to bend it, thereby causing the second push rod 6, the front wheel connecting rod 3, the first linkage support rod 7, and the second linkage support rod 41 to fold toward the position of the rear wheel connecting rod 4 at the same time. The first transmission cable 91 drives the backrest locking member 9 to release under the pull of the driving support rod 61. At this time, the support backrest 8 is in a relaxed state and rotates toward the position of the rear wheel connecting rod 4 under the pull of the first transmission cable 91, thereby achieving the folding of the entire trolley in one step.

[0040] Step 2. When the user opens the entire device, the first transmission cable 91 loses its tension, and the locking spring 95 pushes the locking gear 93 into the interior of the locking bottom housing 92, thereby locking the support backrest 8 to provide support for the child's back in the stroller.

[0041] Step 3. When the user needs to adjust the angle of the support backrest 8, the manual adjustment part 81 will be pulled up to drive the second transmission cable 811, so that the locking gears 93 on both sides move inward, causing the locking gears 93 on both sides to lose coordination with the locking bottom shells 92 on both sides. At this time, the user can adjust the setting angle of the support backrest 8 according to needs, and release the manual adjustment part 81 after the adjustment is completed, so that the backrest locking part 9 is in a locked state again.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. One-button linkage backrest retraction mechanism, characterized by: The invention comprises a cart front wheel (1), a cart rear wheel (2), a front wheel connecting rod (3), a rear wheel connecting rod (4), a first push rod (5), a second push rod (6), a first linkage support rod (7), a support backrest (8) and a backrest locking member (9), wherein the cart front wheel (1), the front wheel connecting rod (3), the cart rear wheel (2) and the rear wheel connecting rod (4) are each provided with two, and the two cart front wheels (1) are respectively connected to the bottom ends of the two front wheel connecting rods (3), and the two cart rear wheels (2) are connected to the bottom ends of the two rear wheel connecting rods (4), the two front wheel connecting rods (3) and the two rear wheel connecting rods (4) are arranged on both sides, and the top of the single front wheel connecting rod (3) on the same side is connected to the top of the single rear wheel connecting rod (4), the first push rod (5) is arranged in a U shape, and the second push rod (6) is provided with two One end of the two second push rods (6) is connected to the two sides of the first push rod (5), and the other side of the two second push rods (6) is connected to the two front wheel connecting rods (3). Two first linkage support rods (7) are provided. The two first linkage support rods (7) are respectively connected to the second push rods (6) and the rear wheel connecting rod (4) on both sides. Two backrest locking members (9) are provided. The two backrest locking members (9) are respectively arranged on the first linkage support rods (7) on both sides. The two sides of the support backrest (8) are respectively fixedly installed on the two backrest locking members (9). A first transmission steel cable (91) is respectively provided in the two backrest locking members (9). A driving support rod (61) is provided between the two second push rods (6). The two first transmission steel cables (91) are limited on the driving support rod (61). The support backrest (8) is provided with a manual adjustment member (81), and the manual adjustment member (81) is connected to two second transmission cables (811), and the other ends of the two second transmission cables (811) are respectively fixedly connected to the locking gears (93) located inside the backrest locking members (9) on both sides; It also includes a second linkage support rod (41), wherein two second linkage support rods (41) are provided, one end of the two second linkage support rods (41) are respectively connected to the top of the two rear wheel connecting rods (4), and the other end of the two second linkage support rods (41) are respectively connected to the two sides of the first push rod (5).

2. The one-button linkage backrest retracting mechanism according to claim 1, characterized in that: The backrest locking member (9) is composed of a locking bottom shell (92), a locking gear (93), a locking mounting rod (94), a locking spring (95) and a locking shell (96). The locking bottom shell (92) is installed on the first linkage support rod (7). A circle of tooth grooves is provided inside the locking bottom shell (92). The locking mounting rod (94) is inserted into the locking bottom shell (92). The locking gear (93) is sleeved on the locking mounting rod (94). The locking shell (96) and the locking bottom shell (92) are mutually covered and the locking gear (93) is wrapped therein. The support backrest (8) is fixedly connected to the locking shell (96), and the inner wall of the locking shell (96) is provided with a circle of movable grooves. The locking gear (93) is located between the locking bottom shell (92) and the locking shell (96), and the teeth of a circle of teeth on the locking gear (93) are located in the tooth grooves on the inner side of the locking bottom shell (92) and the movable groove on the locking shell (96). The locking spring (95) is arranged between the locking gear (93) and the locking shell (96), and the first transmission cable (91) passes through the locking shell (96) and is transmission-connected to the locking gear (93).

3. The one-button linkage backrest retracting mechanism according to claim 2, characterized in that: A connecting foot plate (42) is provided at the intersection of the front wheel connecting rod (3) and the rear wheel connecting rod (4) on both sides. A table board connecting rod (43) is provided in the middle of the connecting foot plate (42). The bottom of the table board connecting rod (43) is connected to the connecting foot plate (42). The top of the table board connecting rod (43) is provided with a table board (44) for placing.

4. The one-button linkage backrest retracting mechanism according to claim 3, characterized in that: A cup holder (51) is provided at the side end of the first push rod (5).

5. The backrest folding method of the one-button linkage backrest folding mechanism according to claim 4, characterized in that: The following steps are involved: Step 1. When the user needs to fold the device as a whole, the user only needs to open the lock of the device as a whole, and then push the first push rod (5) to bend, so that the second push rod (6), the front wheel connecting rod (3), the first linkage support rod (7) and the second linkage support rod (41) are folded toward the position of the rear wheel connecting rod (4) at the same time, and the first transmission steel cable (91) drives the backrest locking member (9) to release under the pull of the driving support rod (61). At this time, the support backrest (8) is in a relaxed state and rotates toward the position of the rear wheel connecting rod (4) under the pull of the first transmission steel cable (91), thereby realizing the folding of the entire trolley in one step; Step 2. When the user opens the device as a whole, the first transmission steel cable ( 91) loses its pulling force, and under the action of the locking spring (95), the locking gear (93) is pushed into the interior of the locking bottom shell (92), thereby putting the support backrest (8) in a locked state, so as to provide support for the back of the child in the stroller; Step 3. When the user needs to adjust the angle of the support backrest (8), the manual adjustment member (81) is moved to drive the second transmission cable (811) to pull up, thereby moving the locking gears (93) on both sides inward, causing the locking gears (93) on both sides to lose their coordination with the locking bottom shell (92) on both sides. At this time, the user can adjust the setting angle of the support backrest (8) as needed, and release the manual adjustment member (81) after the adjustment is completed, so that the backrest locking member (9) is in a locked state again.

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