CN115503807B - Child cart - Google Patents

Abstract

The present invention relates to a child stroller, comprising a frame with an unfolded state and a folded state, a front wheel assembly, and a rear wheel assembly. The frame comprises side brackets located on the left and right sides respectively. The side brackets in the unfolded state comprise: a front wheel bracket, a rear wheel bracket, a push handle rod, a seat rod, a rear connecting rod, a folding pull rod, and a first locking device. The child stroller has a forward use state and a backward use state. During the transformation between the backward use state and the forward use state, the upper end of the folding pull rod and the lower end of the push handle rod slide along a sliding groove and are rotatably connected. The purpose of the present invention is to provide an improved child stroller, in which the seat rod does not move up and down during the reversal of the push handle rod, thereby improving the use experience of the child, and the folded child stroller is small in size and the folding process is simple.

Description

A child stroller

Technical Field

The invention belongs to the technical field of children's products, and in particular relates to a child stroller.

Background Art

Strollers play an important role in helping users carry infants and young children in their daily lives, and have become one of the indispensable children's products in the process of children's growth. Most of the existing child strollers can be turned and folded. However, the current child strollers are prone to cause the seat rod to arch upward during the process of pushing the handlebar to turn, which affects the riding experience of children. In addition, the folded child stroller is relatively large in size, and the folding process is relatively simple and cumbersome.

Summary of the invention

The purpose of the present invention is to provide an improved child stroller, in which the seat rod does not move up and down during the direction change of the handlebar rod, thereby improving the use experience of the child, and the child stroller is smaller in size after folding, and the folding process is simple.

In order to achieve the above object, the technical solution adopted by the present invention is:

A child stroller, comprising a frame having an unfolded state and a folded state, a front wheel assembly, and a rear wheel assembly, wherein the frame comprises side brackets located on left and right sides respectively, and the side brackets in the unfolded state comprise:

A front wheel bracket, wherein the front wheel assembly is arranged at the lower part of the front wheel bracket;

A rear wheel bracket, wherein the rear wheel assembly is arranged at the lower part of the rear wheel bracket;

A push handle rod, wherein the lower end of the push handle rod is coaxially pivotally connected with the upper end of the front wheel bracket and the upper end of the rear wheel bracket through a central rotating shaft, and a sliding groove is formed at the lower end of the push handle rod below the central rotating shaft, and the sliding groove has an end away from the central rotating shaft and an end close to the central rotating shaft;

A seat rod, used to connect a seat for a child to sit on, wherein the front end of the seat rod is pivotally connected to the front wheel bracket via a front wheel bracket rotating shaft, and the front wheel bracket rotating shaft is located below the central rotating shaft;

A rear connecting rod, wherein the front end of the rear connecting rod is pivotally connected to the seat rod via a rear connecting rod front rotating shaft, the rear connecting rod front rotating shaft is located at the rear of the front wheel bracket rotating shaft, the rear end of the rear connecting rod is pivotally connected to the rear wheel bracket via a rear wheel bracket rotating shaft, and the rear wheel bracket rotating shaft is located below the central rotating shaft;

A folding pull rod, wherein the lower end of the folding pull rod is pivotally connected to the seat rod and/or the rear connecting rod through a lower rotating shaft of the folding pull rod, and the upper end of the folding pull rod is provided with a guide column, the guide column is inserted into the sliding groove, and the guide column is located below the central rotating shaft;

A first locking device, wherein the first locking device has a locking working state and an unlocking working state. In the locking working state, the push handle rod is prohibited from rotating relative to the front wheel bracket and/or the rear wheel bracket, and in the unlocking working state, the push handle rod is allowed to rotate relative to the front wheel bracket and/or the rear wheel bracket;

The child stroller has a forward use state and a rearward use state. When the first locking device is in the unlocked working state, the push handle rod rotates forward or backward relative to the front wheel bracket and the rear wheel bracket so that the child stroller is switched between the rearward use state and the forward use state; during the switching process between the rearward use state and the forward use state, the upper end of the folding pull rod and the lower end of the push handle rod slide along the sliding groove and are rotatably connected; in the rearward use state and when the first locking device is in the unlocked working state, the frame is allowed to switch from the unfolded state to the folded state; in the forward use state and when the first locking device is in the unlocked working state, the frame is allowed to switch from the unfolded state to the folded state.

Preferably, the lower rotating shaft of the folding pull rod and the front rotating shaft of the rear connecting rod are the same common rotating shaft with the axial center lines coinciding, and the lower end of the folding pull rod is pivotally connected with the front end of the rear connecting rod and the seat rod on the same axis through the common rotating shaft.

Preferably, the length direction of the sliding groove extends along the radial direction of the central rotating shaft.

Preferably, a partial arc-shaped guide groove is formed at the upper end of the rear wheel bracket, and the partial arc-shaped guide groove is arranged around the central rotating shaft.

Furthermore, the two ends of the partially circular guide groove are respectively a front guide groove entrance end and a rear guide groove entrance end; in the forward use state, the guide post is located at the front guide groove entrance end, and in the forward use state and during the conversion of the frame from the unfolded state to the folded state, the guide post does not slide in the sliding groove, and the guide post enters the partially circular guide groove from the front guide groove entrance end and slides along the partially circular guide groove; in the rearward use state, the guide post is located at the rear guide groove entrance end, and in the rearward use state and during the conversion of the frame from the unfolded state to the folded state, the guide post does not slide in the sliding groove, and the guide post enters the partially circular guide groove from the rear guide groove entrance end and slides along the partially circular guide groove.

Furthermore, the upper end of the rear wheel bracket between the front guide groove entrance end and the rear guide groove entrance end has a notch, and the notch is used for the guide column to move in the notch during the transformation of the stroller between the rearward use state and the forward use state.

Preferably, the first locking device comprises:

A lock tongue, wherein the lock tongue is slidably disposed in the inner cavity at the lower part of the push handle rod along the length direction of the push handle rod, an elastic member is disposed between the lock tongue and the push handle rod and the elastic member abuts against the lock tongue;

A forward locking hole, the forward locking hole is opened at the upper end of the front wheel bracket or the upper end of the rear wheel bracket, the opening direction of the forward locking hole is the radial direction of the central shaft, when the stroller is in the forward use state, the locking tongue is inserted into the forward locking hole, and the first locking device is in a locking working state;

A rearward locking hole, the rearward locking hole is opened at the upper end of the front wheel bracket or the upper end of the rear wheel bracket, the opening direction of the rearward locking hole is the radial direction of the central shaft, when the stroller is in the rearward use state, the locking tongue is inserted into the rearward locking hole, and the first locking device is in a locking working state;

A lock tongue driving member, wherein the lock tongue driving member is connected to the lock tongue. When the lock tongue driving member pulls the lock tongue out of the forward locking hole or the rearward locking hole, the first locking device is in an unlocking working state. The elastic member applies an elastic force to the lock tongue, so that the lock tongue has a tendency to be inserted into the forward locking hole or the rearward locking hole.

Preferably, the side bracket further comprises a second locking device, wherein the second locking device is arranged between the front wheel bracket and the rear wheel bracket, and the second locking device has a locking working state and an unlocking working state. In the locking working state, the frame is locked in the unfolded state. When the first locking device and the second locking device are both in the unlocking working state, the child stroller is allowed to be converted from the unfolded state to the folded state in the rearward use state, and the child stroller is also allowed to be converted from the unfolded state to the folded state in the forward use state.

Preferably, a transverse connecting rod is connected between the two side brackets.

A folding method for a child stroller, when the first locking device and the second locking device are both in an unlocked working state, the child stroller can be operated to switch from an unfolded state to a folded state in the rearward use state or the forward use state.

Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

The child stroller of the present invention increases the guide column on the upper part of the folding pull rod, so that the seat rod does not move up and down during the direction change of the push handle rod, thereby improving the use experience of the child; the child stroller can be folded in both the forward use state and the reverse use state; the folding process is simple; and the folded child stroller is small in size and easy to carry.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a perspective view of a child stroller according to an embodiment of the present invention in a forward-facing use state;

FIG2 is a side view of the child stroller according to the embodiment of the present invention in a forward-facing use state;

Fig. 3 is a schematic cross-sectional view along the A-A direction in Fig. 2;

FIG4 is a top view of the child stroller according to the embodiment of the present invention in a forward-facing use state;

Fig. 5 is a schematic cross-sectional view along the B-B direction in Fig. 4;

FIG6 is a side view of the child stroller according to the embodiment of the present invention between the forward use state and the rearward use state;

Fig. 7 is a schematic cross-sectional view along the C-C direction in Fig. 6;

FIG8 is a top view of the child stroller according to the embodiment of the present invention between the forward use state and the rearward use state;

Fig. 9 is a schematic cross-sectional view along the D-D direction in Fig. 8;

FIG10 is a side view of the child stroller according to the embodiment of the present invention in a rearward-facing use state;

Fig. 11 is a schematic cross-sectional view along the E-E direction in Fig. 10;

FIG12 is a top view of the child stroller according to the embodiment of the present invention in a rearward-facing use state;

Fig. 13 is a schematic cross-sectional view along the F-F direction in Fig. 12;

FIG14 is a side view of the child stroller in a semi-folded state according to an embodiment of the present invention, wherein the push handle is in a forward use state;

FIG15 is a top view of the child stroller according to the embodiment of the present invention in a semi-folded state, wherein the push handle is in a forward use state;

Fig. 16 is a schematic cross-sectional view along the G-G direction in Fig. 15;

FIG17 is a side view of the child stroller in a semi-folded state according to an embodiment of the present invention, wherein the push handle is in a reverse use state;

FIG18 is a top view of the child stroller according to the embodiment of the present invention in a semi-folded state, wherein the push handle is in a reverse use state;

Fig. 19 is a schematic cross-sectional view along the H-H direction in Fig. 18;

FIG20 is a side view of the child stroller in a folded state according to an embodiment of the present invention, wherein the push handle is in a forward use state;

FIG21 is a top view of the child stroller according to the embodiment of the present invention in a folded state, wherein the push handle is in a forward use state;

Fig. 22 is a schematic cross-sectional view along line I-I in Fig. 21;

FIG23 is a side view of the child stroller according to the embodiment of the present invention in a folded state, wherein the push handle is in a reverse use state;

FIG24 is a top view of the child stroller according to the embodiment of the present invention in a folded state, wherein the push handle is in a reverse use state;

Fig. 25 is a schematic cross-sectional view along the J-J direction in Fig. 24;

26 is a cross-sectional view of a first locking device of a child stroller according to an embodiment of the present invention, wherein the push handle is in a forward use state;

FIG27 is a partial enlarged schematic diagram of point A in FIG26;

28 is a cross-sectional view of a first locking device of a child stroller according to an embodiment of the present invention, wherein the push handle is in a reverse use state;

FIG29 is a partial enlarged schematic diagram of point B in FIG28;

FIG30 is a cross-sectional view of a second locking device of a child stroller according to an embodiment of the present invention;

Fig. 31 is a cross-sectional view along the K-K line in Fig. 30 , wherein the second locking device is in a locked state;

Fig. 32 is a cross-sectional view along the K-K line in Fig. 30 , wherein the second locking device is in an unlocked state;

Among them, 1, frame; 11, side bracket; 111, front wheel bracket; 1111, front wheel bracket shaft; 112, rear wheel bracket; 1121, rear wheel bracket shaft; 113, push handle rod; 1131, center shaft; 1132, sliding groove; 11321, first end; 11322, second end; 114, seat rod; 115, rear connecting rod; 1151, rear connecting rod front shaft; 116, folding pull rod; 1161, folding pull rod lower shaft; 1162, guide column; 117, first Locking device; 1171, lock tongue; 1172, elastic member; 1173, rearward locking hole; 1174, forward locking hole; 1175, lock tongue driving member; 118, partially arc-shaped guide groove; 1181, front guide groove entrance end; 1182, rear guide groove entrance end; 1183, notch; 1184, limit block; 119, second locking device; 1191, intermediate gear; 1192, first tooth groove; 1193, second tooth groove; 2, front wheel assembly; 3, rear wheel assembly; 4, cross connecting rod.

DETAILED DESCRIPTION

The present invention is further described below in conjunction with the examples. However, the present invention is not limited to the following examples. The implementation conditions used in the examples can be further adjusted according to the different requirements of specific use, and the implementation conditions not specified are conventional conditions in the industry. The technical features involved in each embodiment of the present invention can be combined with each other as long as they do not conflict with each other.

In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

In the embodiments of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

The disclosure below provides many different embodiments or examples to realize different structures of the embodiments of the present invention. In order to simplify the disclosure of the embodiments of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present invention. In addition, the embodiments of the present invention can repeat reference numbers and/or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and/or settings discussed.

In the description of the present invention, the directions involved, such as “front”, “rear”, “left”, “right”, “up” and “down”, are all defined with reference to the directions observed by a child when riding. As shown in FIG2 , the left direction in the figure is “front”, the right direction in the figure is “rear”, the upper direction in the figure is “up”, the lower direction in the figure is “down”, and the direction perpendicular to the paper surface in the figure is the left and right direction. The definitions of the above directions are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

As shown in Figures 1 to 32, the child stroller of this embodiment includes a frame 1 with unfolded and folded states, a front wheel assembly 2 and a rear wheel assembly 3, wherein the frame 1 includes side brackets 11 located on the left and right sides respectively, and a transverse connecting rod 4 is connected between the two side brackets 11.

The following is a detailed introduction to the specific structure of the stroller and the connection relationship between the various components:

In this embodiment, as shown in FIGS. 1 to 13 , the side bracket 11 comprises a front wheel bracket 111, a rear wheel bracket 112, a push handle rod 113, a seat rod 114, a rear connecting rod 115 and a folding pull rod 116 in the unfolded state. The front wheel assembly 2 is arranged at the lower part of the front wheel bracket 111, and the rear wheel assembly 3 is arranged at the lower part of the rear wheel bracket 112; the lower end of the push handle rod 113 is coaxially pivotally connected with the upper end of the front wheel bracket 111 and the upper end of the rear wheel bracket 112 through a central rotating shaft 1131. As shown in FIGS. 2 and 6 , the lower end of the push handle rod 113 has a portion located below the central rotating shaft 1131, and a sliding groove 1132 is formed on the portion of the push handle rod 113, and the sliding groove 1132 has a first end 11321 away from the central rotating shaft 1131 and a second end 11322 close to the central rotating shaft 1131. The seat bar 114 is used to connect a seat for children to sit on. The front end of the seat bar 114 is pivotally connected to the front wheel support 111 through the front wheel support shaft 1111, and the front wheel support shaft 1111 is located below the central shaft 1131. The front end of the rear link 115 is pivotally connected to the seat bar 114 through the rear link front shaft 1151, and the rear link front shaft 1151 is located behind the front wheel support shaft 1111. The rear end of the rear link 115 is pivotally connected to the rear wheel support 112 through the rear wheel support shaft 1121, and the rear wheel support shaft 1121 is located below the central shaft 1131. The lower end of the folding rod 116 is pivotally connected with the seat bar 114 and the rear link 115 through the folding rod lower rotating shaft 1161. The folding rod lower rotating shaft 1161 and the rear link front rotating shaft 1151 are the same common rotating shaft with the axis center line coincident. The lower end of the folding rod 116 is pivotally connected with the front end of the rear link 115 and the seat bar 114 through the common rotating shaft (i.e. the above rotating shaft 1151 or 1161) on the same axis. In some other embodiments, the lower end of the folding rod 116 can be pivotally connected with any one of the seat bar 114 or the rear link 115. The upper end of the folding rod 116 is provided with a guide column 1162, which is inserted into the sliding groove 1132 and is located at the lower part of the central rotating shaft 1131. The length direction of the sliding groove 1132 extends along the radial direction of the central rotating shaft 1131.

The side bracket 11 also includes a first locking device 117, as shown in Figures 26 to 29, the first locking device 117 specifically includes a lock tongue 1171, an elastic member 1172, a rearward locking hole 1173, a forward locking hole 1174 and a lock tongue driving member 1175, the first locking device 117 has a locking working state and an unlocking working state, in the locking working state, the push handle rod 113 is prohibited from rotating relative to the front wheel bracket 111 or the rear wheel bracket 112, in some other embodiments, the push handle rod 113 is prohibited from rotating relative to the front wheel bracket 111 and the rear wheel bracket 112 at the same time; in the unlocking working state, the push handle rod 113 is allowed to rotate relative to the front wheel bracket 111 or the rear wheel bracket 112, in some other embodiments, the push handle rod 113 is allowed to rotate relative to the front wheel bracket 111 and the rear wheel bracket 112 at the same time.

The child stroller has a forward use state and a rearward use state. When the first locking device 117 is in the unlocked working state, the push handle rod 113 rotates forward or backward relative to the front wheel bracket 111 and the rear wheel bracket 112 to switch the child stroller between the rearward use state and the forward use state; during the switch between the rearward use state and the forward use state, the upper end of the folding pull rod 116 and the lower end of the push handle rod 113 slide along the sliding groove 1132 and are rotatably connected, specifically, the guide column 1162 slides in the sliding groove 132; in the rearward use state and when the first locking device 117 is in the unlocked working state, the frame 1 is allowed to switch from the unfolded state to the folded state; in the forward use state and when the first locking device 117 is in the unlocked working state, the frame 1 is allowed to switch from the unfolded state to the folded state.

Specifically, the locking tongue 1171 is slidably arranged in the inner cavity at the lower part of the push handle rod 113 along the length direction of the push handle rod 113, and an elastic member 1172 is arranged between the locking tongue 1171 and the push handle rod 113, and the elastic member 1172 abuts against the locking tongue 1171; the forward locking hole 1174 is opened at the upper end of the front wheel bracket 111 or the upper end of the rear wheel bracket 112, and the opening direction of the forward locking hole 1174 is the radial direction of the central rotation axis 1131. When the child stroller is in the forward use state, as shown in Figures 26 and 27, the locking tongue 1171 is inserted into the forward locking hole 1174, and the first locking device 117 is in the locking working state; the rearward locking hole 1173 is opened at the upper end of the front wheel bracket 111 or the upper end of the rear wheel bracket 112, and the opening direction of the rearward locking hole 1173 is the radial direction of the central rotation axis In the radial direction of 1131, when the stroller is in the rearward use state, as shown in Figures 28 and 29, the locking tongue 1171 is inserted into the rearward locking hole 1173, and the first locking device 117 is in the locked working state; the locking tongue driving member 1175 is connected to the locking tongue 1171. When the locking tongue driving member 1175 pulls the locking tongue 1171 out of the forward locking hole 1174 or the rearward locking hole 1173, the first locking device 117 is in the unlocked working state, and the elastic member 1172 applies an elastic force to the locking tongue 1171, so that the locking tongue 1171 has a tendency to be inserted into the forward locking hole 1174 or the rearward locking hole 1173.

The upper end of the rear wheel bracket 112 is provided with a partially arc-shaped guide groove 118, which is circumferentially oriented around the central rotation axis. 1131 is set, and the two ends of the partial arc-shaped guide groove 118 are respectively a front guide groove entrance end 1181 and a rear guide groove entrance end 1182; as shown in Figures 2 to 5, in the forward use state, the guide column 1162 is located at the front guide groove entrance end 1181, and is also located at the first end 11321 of the sliding groove 132; as shown in Figures 10 to 13, in the rearward use state, the guide column 1162 is located at the rear guide groove entrance end 1182, and is also located at the first end 11321 of the sliding groove 132; the upper end of the rear wheel bracket 112 between the front guide groove entrance end 1181 and the rear guide groove entrance end 1182 has a notch 1183, and the notch 1183 is used for the guide column 1162 to be restricted by the limit block 1184 and move in the notch 1183 during the transformation of the stroller between the rearward use state and the forward use state, and at this time the guide column 1162 is located at the second end 11322 of the sliding groove 132.

The side bracket 11 further includes a second locking device 119, which is disposed between the front wheel bracket 111 and the rear wheel bracket 112. The second locking device 119 has a locked working state and an unlocked working state. In the locked working state, the frame 1 is locked in the unfolded state. The first locking device 117 and the second locking device 119 are both in the unlocked working state, allowing the child stroller to be converted from the unfolded state to the folded state in the rearward use state, and also allowing the child stroller to be converted from the unfolded state to the folded state in the forward use state. Specifically, as shown in Figures 30 to 32, the second locking device specifically includes an intermediate gear 1191, a first tooth groove 1192, and a second tooth groove 1193. The second locking device 119 has a locked working state and an unlocked working state; as shown in Figure 31, in the locked working state, the frame 1 is locked in the unfolded state, and the intermediate gear 1191 is respectively inserted into the first tooth groove 1192 and the second tooth groove 1193, so that the intermediate gear 1191 is meshed with the first tooth groove 1192 and the second tooth groove 1193 at the same time; as shown in Figure 32, in the unlocked working state, the intermediate gear 1191 is disengaged from one of the tooth grooves and only inserted into the other tooth groove, so that the intermediate gear 1191 is only meshed with one of the first tooth groove 1192 and the second tooth groove 1193.

When the stroller in this embodiment is in the unfolded state, as shown in FIGS. 1 to 5 , when the stroller is in the forward use state, the extension directions of the push handle 113 and the front wheel bracket 111 are substantially the same, and the push handle 113 can be pushed forward to move the stroller forward. As shown in FIGS. 10 to 13 , when the stroller is in the backward use state, the extension directions of the push handle 113 and the rear wheel bracket 112 are substantially the same.

When the stroller is converted from the unfolded state to the folded state, as shown in FIGS. 14 to 19 , the push handle 113 is folded downward around the central axis 1131 , the folding pull rod 116 tends to move upward, and the front wheel bracket 111 and the rear wheel bracket 112 are gradually retracted relative to each other. As shown in Figures 14 to 16, in the forward use state and during the conversion of the frame 1 from the unfolded state to the folded state, the guide column 1162 is located at the first end 11321 of the sliding groove 1132 and does not slide in the sliding groove 1132, and the guide column 1162 enters the partially circular guide groove 118 from the front guide groove entrance end 1181 and slides along the partially circular guide groove 118; as shown in Figures 17 to 19, in the rearward use state and during the conversion of the frame 1 from the unfolded state to the folded state, the guide column 1162 is located at the first end 11321 of the sliding groove 1132 and does not slide in the sliding groove 1132, and the guide column 1162 enters the partially circular guide groove 118 from the rear guide groove entrance end 1182 and slides along the partially circular guide groove 118.

When the child stroller is in a folded state, as shown in Figures 20 to 25, the extension directions of the handlebar 113, the front wheel bracket 111 and the rear wheel bracket 112 are substantially the same, the upper end of the handlebar 113, the lower end of the front wheel bracket 111 and the lower end of the rear wheel bracket 112 are close to each other, and the front wheel assembly 2 and the rear wheel assembly 3 overlap in the left-right direction. At this time, the volume of the child stroller is the smallest, which is convenient for transportation and carrying.

In summary, the child stroller of the present invention improves the use experience of children by adding a guide column on the upper part of the folding pull rod, so that the seat rod will not move up and down during the direction change of the push handle rod, and the child stroller can be folded in both the forward use state and the reverse use state. The folding process is simple, and the folded child stroller is small in size and easy to carry.

The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A stroller for children, comprising a frame having an unfolded state and a folded state, a front wheel assembly, and a rear wheel assembly, wherein the frame comprises side brackets located on the left and right sides respectively, wherein the side brackets in the unfolded state comprise: A front wheel bracket, wherein the front wheel assembly is arranged at the lower part of the front wheel bracket; A rear wheel bracket, wherein the rear wheel assembly is arranged at the lower part of the rear wheel bracket; A push handle rod, wherein the lower end of the push handle rod is coaxially pivotally connected with the upper end of the front wheel bracket and the upper end of the rear wheel bracket through a central rotating shaft, and a sliding groove is formed at the lower end of the push handle rod below the central rotating shaft, and the sliding groove has an end away from the central rotating shaft and an end close to the central rotating shaft; A seat rod, used to connect a seat for a child to sit on, wherein the front end of the seat rod is pivotally connected to the front wheel bracket via a front wheel bracket rotating shaft, and the front wheel bracket rotating shaft is located below the central rotating shaft; A rear connecting rod, wherein the front end of the rear connecting rod is pivotally connected to the seat rod via a rear connecting rod front rotating shaft, the rear connecting rod front rotating shaft is located at the rear of the front wheel bracket rotating shaft, the rear end of the rear connecting rod is pivotally connected to the rear wheel bracket via a rear wheel bracket rotating shaft, and the rear wheel bracket rotating shaft is located below the central rotating shaft; A folding pull rod, wherein the lower end of the folding pull rod is pivotally connected to the seat rod and/or the rear connecting rod through a lower rotating shaft of the folding pull rod, and the upper end of the folding pull rod is provided with a guide column, the guide column is inserted into the sliding groove, and the guide column is located below the central rotating shaft; A first locking device, wherein the first locking device has a locking working state and an unlocking working state. In the locking working state, the push handle rod is prohibited from rotating relative to the front wheel bracket and/or the rear wheel bracket, and in the unlocking working state, the push handle rod is allowed to rotate relative to the front wheel bracket and/or the rear wheel bracket; The child stroller has a forward use state and a rearward use state. When the first locking device is in the unlocked working state, the push handle rod rotates forward or backward relative to the front wheel bracket and the rear wheel bracket so that the child stroller is switched between the rearward use state and the forward use state; during the switching process between the rearward use state and the forward use state, the upper end of the folding pull rod and the lower end of the push handle rod slide along the sliding groove and are rotatably connected; in the rearward use state and when the first locking device is in the unlocked working state, the frame is allowed to switch from the unfolded state to the folded state; in the forward use state and when the first locking device is in the unlocked working state, the frame is allowed to switch from the unfolded state to the folded state; The side bracket also includes a second locking device, which is arranged between the front wheel bracket and the rear wheel bracket. The second locking device has a locking working state and an unlocking working state. In the locking working state, the frame is locked in the unfolded state. When the first locking device and the second locking device are both in the unlocking working state, the child stroller is allowed to be converted from the unfolded state to the folded state in the rearward use state, and the child stroller is also allowed to be converted from the unfolded state to the folded state in the forward use state. 2. The stroller according to claim 1 is characterized in that the lower rotating shaft of the folding pull rod and the front rotating shaft of the rear connecting rod are the same common rotating shaft with the axis center lines coinciding with each other, and the lower end of the folding pull rod is pivotally connected with the front end of the rear connecting rod and the seat rod on the same axis through the common rotating shaft. 3. The stroller according to claim 1, characterized in that the length direction of the sliding groove extends along the radial direction of the central rotating shaft. 4. The stroller according to claim 1, characterized in that a partial arc-shaped guide groove is opened at the upper end of the rear wheel bracket, and the partial arc-shaped guide groove is arranged around the central rotating shaft. 5. The stroller according to claim 4, characterized in that the two ends of the partially circular guide groove are respectively a front guide groove entrance end and a rear guide groove entrance end; in the forward use state, the guide post is located at the front guide groove entrance end, and in the forward use state and during the conversion of the frame from the unfolded state to the folded state, the guide post does not slide in the sliding groove, and the guide post enters the partially circular guide groove from the front guide groove entrance end and slides along the partially circular guide groove; in the rearward use state, the guide post is located at the rear guide groove entrance end, and in the rearward use state and during the conversion of the frame from the unfolded state to the folded state, the guide post does not slide in the sliding groove, and the guide post enters the partially circular guide groove from the rear guide groove entrance end and slides along the partially circular guide groove. 6. The stroller according to claim 5, characterized in that the upper end of the rear wheel bracket between the front guide groove entrance end and the rear guide groove entrance end has a notch, and the notch is used for the guide column to move in the notch during the transformation of the stroller between the rearward use state and the forward use state. 7. The stroller according to claim 1, wherein the first locking device comprises: A lock tongue, wherein the lock tongue is slidably disposed in the inner cavity at the lower part of the push handle rod along the length direction of the push handle rod, an elastic member is disposed between the lock tongue and the push handle rod and the elastic member abuts against the lock tongue; A forward locking hole, the forward locking hole is opened at the upper end of the front wheel bracket or the upper end of the rear wheel bracket, the opening direction of the forward locking hole is the radial direction of the central shaft, when the stroller is in the forward use state, the locking tongue is inserted into the forward locking hole, and the first locking device is in a locking working state; A rearward locking hole, the rearward locking hole is opened at the upper end of the front wheel bracket or the upper end of the rear wheel bracket, the opening direction of the rearward locking hole is the radial direction of the central shaft, when the stroller is in the rearward use state, the locking tongue is inserted into the rearward locking hole, and the first locking device is in a locking working state; A lock tongue driving member, wherein the lock tongue driving member is connected to the lock tongue. When the lock tongue driving member pulls the lock tongue out of the forward locking hole or the rearward locking hole, the first locking device is in an unlocking working state. The elastic member applies an elastic force to the lock tongue, so that the lock tongue has a tendency to be inserted into the forward locking hole or the rearward locking hole. 8. The baby stroller according to claim 1, characterized in that a transverse connecting rod is connected between the two side brackets. 9. A folding method for a child stroller as claimed in any one of claims 1 to 8, characterized in that when the first locking device and the second locking device are both in the unlocked working state, the child stroller can be operated to switch from the unfolded state to the folded state in the rearward use state or the forward use state.