stroller

Abstract

The stroller includes a frame (1), a front wheel assembly (2), and a rear wheel assembly (3) that can be folded and unfolded. The frame includes side brackets (11) located on both the left and right sides. When folded, the side brackets include a front wheel bracket (111), a rear wheel bracket (112), a push bar (113), a seat post (114), a rear link (115), a folding pull rod (116), and a first locking device (117). The stroller can be used in a forward-facing state and a rear-facing state. When the stroller is used in a forward-facing state and a rear-facing state, a slide groove (1132) extending along the lower end of the push bar allows the upper end of the folding pull rod to slide and rotate relative to the lower end of the push bar during conversion between the rear-facing state and the forward-facing state. This improved stroller prevents the seat post from moving up and down when the push bar is flipped, improving the child's experience. Furthermore, the stroller has a small volume when folded, making it easy to carry.

Description

Cross-Reference to Related Art Applications

[0001] This application claims priority to a Chinese patent application filed on September 22, 2022, application number CN2022111583516. [Technical Field]

[0002] The present invention relates to the field of children's products, and more particularly to strollers. [Background technology]

[0003] Strollers play an important role in helping users transport infants and young children in their daily lives, and have become one of the essential children's products during a child's development. Most strollers in the prior art can be folded by inverting, but the seat post is prone to bending upwards when the push bar is inverted, which affects the child's experience, and the folded stroller is large in volume, making the folding process relatively simple and cumbersome. Summary of the Invention [Problem to be solved by the invention]

[0004] In order to solve the above technical problems, the present invention aims to provide an improved stroller in which the seat post does not move up and down when the push bar is reversed, improving the child's experience, reducing the volume after folding, and simplifying the folding process. [Means for solving the problem]

[0005] A stroller having an unfolded state and a folded state, the stroller comprising a frame having side brackets located on both the left and right sides, a front wheel assembly, and a rear wheel assembly, The side bracket, in an unfolded state, a front wheel bracket on the lower part of which the front wheel assembly is mounted; a rear wheel bracket on the lower part of which the rear wheel assembly is mounted; a push bar having a lower end connected to the upper end of the front wheel bracket and the upper end of the rear wheel bracket so as to be rotatable relative to each other, and having a slide groove formed in the lower end; a seat post used to connect a seat for a child to sit on, the seat post having a front end pivotally connected to the front wheel bracket; a rear link having a front end pivotally connected to the seat post and a rear end pivotally connected to the rear wheel bracket; a folding pull rod whose lower end is pivotally connected to the seat post and / or the rear link, whose upper end is provided with a guide column, and whose guide column is inserted into the slide groove; a first locking device having a locking operation state that prohibits the push bar from rotating relative to the front wheel bracket and / or the rear wheel bracket, and an unlocking operation state that allows the push bar to rotate relative to the front wheel bracket and / or the rear wheel bracket, The stroller has a forward-facing use state and a rear-facing use state, and when the first locking device is in an unlocking operation state, the push bar rotates forward or rearward relative to the front wheel bracket and the rear wheel bracket so that the stroller is transformed between the rear-facing use state and the forward-facing use state, and during the transformation between the rear-facing use state and the forward-facing use state, the upper end of the folding pull rod and the lower end of the push bar are connected to be able to slide and rotate oppositely along the slide groove, and in the rear-facing use state, when the first locking device is in an unlocking operation state, the frame is allowed to transform from an unfolded state to a folded state, and in the forward-facing use state, when the first locking device is in an unlocking operation state, the frame is allowed to transform from an unfolded state to a folded state.

[0006] In some embodiments, the lower end of the push bar is connected to the upper end of the front wheel bracket and the upper end of the rear wheel bracket so as to be pivotable relative to each other. For example, two of the three components, the lower end of the push bar, the upper end of the front wheel bracket, and the upper end of the rear wheel bracket, are pivotally connected via one pivot, and the third component is pivotally connected to one of the two components via the other pivot.

[0007] In some other embodiments, the lower end of the push bar is pivotally connected to the upper end of the front wheel bracket and the upper end of the rear wheel bracket via a central rotating shaft.

[0008] In some embodiments, the lower end of the push bar is coaxially pivotally connected to the upper end of the front wheel bracket and the upper end of the rear wheel bracket via a central rotation shaft, the slide groove is located below the central rotation shaft, and the slide groove has an end away from the central rotation shaft and an end close to the central rotation shaft.

[0009] In some embodiments, the length of the slide groove extends in a radial direction of the central rotating shaft.

[0010] In some embodiments, the upper end of the rear wheel bracket is provided with a guide groove that is arranged around the central rotation shaft.

[0011] In some embodiments, the guide groove has a first entrance end and a second entrance end, respectively, and in the forward-facing use state, the guide column is located at the first entrance end, and in the forward-facing use state, during the transformation of the frame from the unfolded state to the folded state, the guide column does not slide within the sliding groove, but the guide column enters the guide groove from the first entrance end and slides along the guide groove; and in the rear-facing use state, the guide column is located at the second entrance end, and in the rear-facing use state, during the transformation of the frame from the unfolded state to the folded state, the guide column does not slide within the sliding groove, but the guide column enters the guide groove from the second entrance end and slides along the guide groove.

[0012] The guide groove has a first opening end and a second opening end at both ends, so that the stroller can be folded in both forward and backward facing states and is easy to operate.

[0013] In some embodiments, the upper end of the rear wheel bracket between the first entrance end and the second entrance end has a notch, which is used in the process of converting the stroller between a rear-facing use state and a forward-facing use state, and the guide column moves within the notch.

[0014] In some embodiments, the first locking device a lock tongue provided in an internal cavity below the push bar so as to be slidable along the length of the push bar, and having an elastic part abutting against the push bar; a front lock hole that is opened at an upper end of the front wheel bracket or an upper end of the rear wheel bracket, the hole opening direction being in a radial direction of the central rotation shaft, and into which the lock tongue is inserted and the first lock device is in a locking operating state when the stroller is in the forward use state; a rear lock hole that is opened at an upper end of the front wheel bracket or an upper end of the rear wheel bracket, the hole opening direction being in a radial direction of the central rotation shaft, and into which the lock tongue is inserted and the first locking device is in a locking operating state when the stroller is in the rearward facing use state; and a lock tongue drive part connected to the lock tongue, which, after the lock tongue is pulled to disengage from the front lock hole or the rear lock hole, causes the first locking device to be in an unlocking operation state and the elastic part to impart an elastic force to the lock tongue, causing the lock tongue to have a tendency to be inserted into the front lock hole or the rear lock hole.

[0015] In some embodiments, the front end of the seat post and the front wheel bracket are pivotally connected via a first rotating shaft, and the first rotating shaft is located below the central rotating shaft; a front end of the rear link is pivotally connected to the seat post via a second rotating shaft, the second rotating shaft being located rearward of the first rotating shaft; a rear end of the rear link is pivotally connected to the rear wheel bracket via a third rotating shaft, the third rotating shaft being located below the central rotating shaft; The lower end of the folding pull rod is pivotally connected to the seat post and / or the rear link via a fourth rotating shaft, and the guide column is located at the lower part of the central rotating shaft.

[0016] In some embodiments, the fourth rotating shaft and the second rotating shaft are the same common rotating shaft having the same axis, and a lower end of the folding pull rod is coaxially pivotally connected to a front end of the rear link and the seat post via the common rotating shaft.

[0017] In some embodiments, the side bracket further includes a second locking device disposed between the front wheel bracket and the rear wheel bracket, the second locking device having a locking operation state and an unlocking operation state, in which the frame is locked in an unfolded state, and when both the first locking device and the second locking device are in the unlocking operation state, the stroller is allowed to convert from the unfolded state to a folded state in the rear-facing use state, and also allows the stroller to convert from the unfolded state to a folded state in the forward-facing use state.

[0018] In some embodiments, a tie rod is connected between the left and right side brackets.

[0019] A method for folding a stroller, in which when both the first locking device and the second locking device are in an unlocking operation state, the stroller is operated so that it can be converted from the unfolded state to the folded state whether in the rear-facing use state or the forward-facing use state. [Effects of the Invention]

[0020] Using the above solution, the present invention has the following advantages over the prior art:

[0021] The stroller of the present invention adds a guide column to the top of the folding pull rod, which prevents the seat post from moving up and down when the push bar is reversed, improving the child's experience. The stroller can be folded in both forward and reverse directions, making the folding process simple and the folded stroller small in volume, making it easy to carry.

[0022] In order to more clearly describe the technical solutions of the present disclosure, the following briefly describes the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can also be obtained by those skilled in the art from these drawings without creative efforts. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a perspective view of a stroller according to an embodiment of the present invention in a forward facing state. [Figure 2] 1 is a side view of a stroller according to an embodiment of the present invention in a forward facing state. [Figure 3] FIG. 3 is a schematic cross-sectional view taken along the AA direction in FIG. 2. [Figure 4] 1 is a plan view of a stroller according to an embodiment of the present invention in a forward-facing state. [Figure 5] FIG. 5 is a schematic cross-sectional view taken along the direction BB in FIG. [Figure 6] 1 is a side view of a stroller according to an embodiment of the present invention, positioned between a forward-facing use position and a rear-facing use position. FIG. [Figure 7] FIG. 7 is a schematic cross-sectional view taken along the CC direction in FIG. [Figure 8] 1 is a plan view of a stroller according to an embodiment of the present invention, positioned between a forward-facing use state and a rear-facing use state. FIG. [Figure 9] FIG. 9 is a schematic cross-sectional view taken along the DD direction in FIG. 8. [Figure 10] 1 is a side view of a stroller according to an embodiment of the present invention in a rearward facing state. [Figure 11] FIG. 11 is a schematic cross-sectional view taken along the EE direction in FIG. [Figure 12] 1 is a plan view of a stroller according to an embodiment of the present invention in a rearward facing state. [Figure 13] 13 is a schematic cross-sectional view taken along the FF direction in FIG. 12. [Figure 14] 1 is a side view of a stroller according to an embodiment of the present invention in a semi-folded state (where the push bar is in the forward use position). FIG. [Figure 15] 1 is a plan view of a stroller according to an embodiment of the present invention in a semi-folded state (where the push bar is in the forward use position). FIG. [Figure 16] FIG. 16 is a schematic cross-sectional view taken along the GG direction in FIG. [Figure 17] 1 is a side view of a stroller according to an embodiment of the present invention in a semi-folded state (where the push bar is in a reverse use state). FIG. [Figure 18] 1 is a plan view of a stroller according to an embodiment of the present invention in a semi-folded state (where the push bar is in a reverse use state). FIG. [Figure 19] FIG. 19 is a schematic cross-sectional view taken along the HH direction in FIG. [Figure 20] FIG. 1 is a side view of a stroller according to an embodiment of the present invention in a folded state (where the push bar is in the forward use position). [Figure 21] 1 is a plan view of a stroller according to an embodiment of the present invention in a folded state (where the push bar is in the forward use position). FIG. [Figure 22] 22 is a schematic cross-sectional view taken along the II direction in FIG. 21. [Figure 23] 1 is a side view of a stroller according to an embodiment of the present invention in a folded state (where the push bar is in a reverse use state). FIG. [Figure 24] 1 is a plan view of a stroller according to an embodiment of the present invention in a folded state (where the push bar is in a reverse use state). FIG. [Figure 25] FIG. 25 is a schematic cross-sectional view taken along the JJ direction in FIG. 24. [Figure 26] 1 is a cross-sectional view of a first locking device of a stroller according to an embodiment of the present invention (where the push bar is in a normal use state). [Figure 27] FIG. 27 is a local enlarged schematic view of part A in FIG. 26. [Figure 28] 1 is a cross-sectional view of a first locking device of a stroller according to an embodiment of the present invention (where the push bar is in a reverse use state); [Figure 29] FIG. 29 is a local enlarged schematic view of part B in FIG. 28. [Figure 30] 4 is a cross-sectional view of a second locking device of the stroller according to the embodiment of the present invention. FIG. [Figure 31]FIG. 31 is a schematic cross-sectional view taken along the KK direction in FIG. 30 (where the second locking device is in a locked state). [Figure 32] 31 is a schematic cross-sectional view taken along the KK direction in FIG. 30 (where the second locking device is in an unlocked state). DETAILED DESCRIPTION OF THE INVENTION

[0024] The present invention will be further described below with reference to examples. However, the present invention is not limited to the following examples. The operating conditions adopted in the examples can be further adjusted according to different requirements of specific use, and the operating conditions not specified are general conditions in the industry. The technical features according to various embodiments of the present invention can be combined with each other as long as they are not contradictory to each other.

[0025] The following is a brief description of merely some exemplary embodiments. As those skilled in the art will appreciate, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

[0026] Furthermore, the terms "first" and "second" are used merely for descriptive purposes and cannot be understood to indicate or imply the relative importance or number of the indicated technical features. Therefore, a feature qualified by "first" or "second" may explicitly or implicitly include one or more of the feature. In describing embodiments of the present invention, "plurality" means two or more, unless otherwise clearly and specifically limited.

[0027] In embodiments of the present invention, unless expressly stated or limited otherwise, a first feature being "above" or "below" a second feature may include direct contact between the first and second features, or may include contact between the first and second features via other features between them rather than direct contact. Furthermore, a first feature being "above," "above," and "on the upper surface" of a second feature may include the first feature being directly above or diagonally above the second feature, or may simply indicate that the horizontal height of the first feature is higher than that of the second feature. A first feature being "below," "below," and "on the lower surface" of a second feature may include the first feature being directly below or diagonally below the second feature, or may simply indicate that the horizontal height of the first feature is lower than that of the second feature.

[0028] The following disclosure provides and implements various embodiments or examples to realize different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, the following describes specific example components and installations. Of course, the following is merely an example and is not intended to limit the embodiments of the present invention. Furthermore, the embodiments of the present invention may repeat reference numerals and / or characters in different examples; such repetition is for the purposes of brevity and clarity and does not in itself indicate a relationship between the various embodiments and / or installations discussed.

[0029] In describing the present invention, the directions such as "front," "back," "left," "right," "up," and "down" mentioned are all defined with reference to the direction observed when a child is seated. As shown in FIG. 2, the left side of the figure is "front," the right side of the figure is "back," the upper side of the figure is "up," the lower side of the figure is "down," and the direction perpendicular to the viewing angle of the figure is the left-right direction. The definitions of the above directions are merely intended to facilitate and simplify the description of the present invention, and are not intended to indicate or suggest that the designated devices or elements must be constructed or operated in a particular orientation, and therefore should not be construed as limiting the present invention.

[0030] As shown in Figures 1 to 32, the stroller of this embodiment comprises a frame 1 having an unfolded state and a folded state, a front wheel assembly 2 and a rear wheel assembly 3, wherein the frame 1 has side brackets 11 located on both the left and right sides, and a tie rod 4 is connected between the two side brackets 11.

[0031] The specific structure of the stroller and the connection relationships of each assembly will be described in detail below.

[0032] 1 to 13, in the unfolded state, the side bracket 11 includes a front wheel bracket 111, a rear wheel bracket 112, a push bar 113, a seat post 114, a rear link 115, and a folding pull rod 116. Here, the front wheel assembly 2 is provided below the front wheel bracket 111, and the rear wheel assembly 3 is provided below the rear wheel bracket 112. The lower end of the push bar 113 is connected to the upper end of the front wheel bracket 111 and the upper end of the rear wheel bracket 112 so as to be rotatable relative to each other. For example, two of the three members, i.e., the lower end of the push bar 113, the upper end of the front wheel bracket 111, and the upper end of the rear wheel bracket 112, are rotatably connected via one pivot, and the third member is rotatably connected to one of the two aforementioned members via the other pivot. In some other embodiments, the lower end of the push bar 113 is pivotally connected to the upper end of the front wheel bracket 111 and the upper end of the rear wheel bracket 112, and in this embodiment, preferably, the lower end of the push bar 113 is coaxially pivotally connected to the upper end of the front wheel bracket 111 and the upper end of the rear wheel bracket 112 via the central rotation shaft 1131 (i.e., the rotation shaft between the push bar 113 and the front wheel bracket 111 and the rotation shaft between the push bar 113 and the rear wheel bracket 112 are the same rotation shaft). As shown in FIGS. 2 and 6 , the lower end of the push bar 113 has a portion below the central rotation shaft 1131, and this portion of the push bar 113 is formed with a slide groove 1132, and the slide groove 1132 has a first end 11321 that is away from the central rotation shaft 1131 and a second end 11322 that is close to the central rotation shaft 1131. The seat post 114 is used to connect a seat for a child to sit on, and the front end of the seat post 114 is pivotally connected to the front wheel bracket 111 via a first rotating shaft 1111, which is located below the central rotating shaft 1131.The front end of the rear link 115 is pivotally connected to the seat post 114 via a second rotating shaft 1151, which is located rearward of the first rotating shaft 1111, and the rear end of the rear link 115 is pivotally connected to the rear wheel bracket 112 via a third rotating shaft 1121, which is located below the central rotating shaft 1131. The lower end of the folding pull rod 116 is pivotally connected to the seat post 114 and the rear link 115 via a fourth rotating shaft 1161, the fourth rotating shaft 1161 and the second rotating shaft 1151 being a common rotating shaft with the same axis, and the lower end of the folding pull rod 116 is coaxially pivotally connected to the front end of the rear link 115 and the seat post 114 via the common rotating shaft (i.e., the above-mentioned rotating shaft 1151 or 1161), and in some other embodiments, the lower end of the folding pull rod 116 may be pivotally connected to either the seat post 114 or the rear link 115. A guide column 1162 is provided at the upper end of the folding pull rod 116, and the guide column 1162 is inserted into a slide groove 1132, which is located below the central rotating shaft 1131. The length direction of the slide groove 1132 extends radially of the central rotating shaft 1131.

[0033] The side bracket 11 further 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 part 1172, a rear locking hole 1173, a front locking hole 1174, and a lock tongue drive part 1175. The first locking device 117 has a locking operation state and an unlocking operation state. In the locking operation state, the push bar 113 is prohibited from rotating relative to the front wheel bracket 111 or the rear wheel bracket 112. In some other embodiments, the push bar 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 operation state, the push bar 113 is allowed to rotate oppositely relative to the front wheel bracket 111 or the rear wheel bracket 112. In some other embodiments, the push bar 113 is allowed to rotate oppositely relative to the front wheel bracket 111 and the rear wheel bracket 112 at the same time.

[0034] The stroller has a forward-facing use state and a rear-facing use state. When the first locking device 117 is in the unlocking operation state, the push bar 113 rotates forward or backward relative to the front wheel bracket 111 and the rear wheel bracket 112 so that the stroller can be transformed between the rear-facing use state and the forward-facing use state. During the transformation between the rear-facing use state and the forward-facing use state, the upper end of the folding pull rod 116 and the lower end of the push bar 113 are connected to each other so that they can slide and rotate oppositely along the sliding groove 1132. Specifically, the guide column 1162 slides in the sliding groove 1132. In the rear-facing use state, when the first locking device 117 is in the unlocking operation state, the frame 1 can be transformed from the unfolded state to the folded state. In the forward-facing use state, when the first locking device 117 is in the unlocking operation state, the frame 1 can be transformed from the unfolded state to the folded state.

[0035] Specifically, the lock tongue 1171 is provided in the internal cavity at the bottom of the push bar 113 so as to be slidable along the length of the push bar 113, and an elastic part 1172 that abuts against the lock tongue 1171 is provided between the lock tongue 1171 and the push bar 113, and the front lock 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 front lock hole 1174 is the radial direction of the central rotating shaft 1131. When the stroller is in the forward-facing use state, as shown in Figures 26 and 27, the lock tongue 1171 is inserted into the front lock hole 1174, and the first locking device 117 is in the locking operation state, and the rear lock hole 1173 is opened at the upper end of the front wheel bracket 111 or the upper end of the rear wheel bracket 112. or the upper end of the rear wheel bracket 112, the opening direction of the rear locking hole 1173 is in the radial direction of the central rotating shaft 1131, when the stroller is in the rearward facing use state, as shown in Figures 28 and 29, the lock tongue 1171 is inserted into the rear locking hole 1173, the first locking device 117 is in the locking operation state, the lock tongue driving part 1175 is connected to the lock tongue 1171, and after the lock tongue driving part 1175 pulls the lock tongue 1171 to disengage from the front locking hole 1174 or the rear locking hole 1173, the first locking device 117 is in the unlocking operation state, and the elastic part 1172 imparts an elastic force to the lock tongue 1171, causing the lock tongue 1171 to have a tendency to be inserted into the front locking hole 1174 or the rear locking hole 1173.

[0036] The upper end of the rear wheel bracket 112 is provided with a partially arcuate guide groove 118, which is arranged around the central rotating shaft 1131. The guide groove 118 has a first entrance end 1181 and a second entrance end 1182, respectively. As shown in FIGS. 2 to 5, when the rear wheel bracket 112 is used in a forward facing position, the guide column 1162 is located at the first entrance end 1181 and at the same time at the first end 11321 of the slide groove 132. As shown in FIGS. 10 to 13, when the rear wheel bracket 112 is used in a backward facing position, the guide column 1162 is located at the second entrance end 1181. The upper end of the rear wheel bracket 112 between the first entrance end 1181 and the second entrance end 1182 has a notch 1183, which is used in the process of the stroller converting between the rear-facing use state and the forward-facing use state. The guide column 1162 is restricted by the limit block 1184 to move within the notch 1183, and at this time, the guide column 1162 is located at the second end 11322 of the slide groove 132.

[0037] The side bracket 11 further includes a second locking device 119 arranged between the front wheel bracket 111 and the rear wheel bracket 112, and the second locking device 119 has a locking operation state and an unlocking operation state. In the locking operation state, the frame 1 is locked in the unfolded state, and when the first locking device 117 and the second locking device 119 are both in the unlocking operation state, the stroller is converted from the unfolded state to the folded state in the rear-facing use state, and is also allowed to be converted from the unfolded state to the folded state in the forward-facing use state. Specifically, as shown in Figures 30 to 32, the second locking device specifically includes an intermediate gear 1191, a first gear groove 1192, and a second gear groove 1193, and the second locking device 119 has a locking operation state and an unlocking operation state. As shown in Figure 31, in the locking operation state, the frame 1 is locked in the unfolded state, and the intermediate gear 1191 is inserted into the first gear groove 1192 and the second gear groove 1193, respectively, and the intermediate gear 1191 is simultaneously engaged with the first gear groove 1192 and the second gear groove 1193. As shown in Figure 32, in the unlocking operation state, the intermediate gear 1191 is disengaged from one of the gear grooves and inserted into only the other gear groove, and the intermediate gear 1191 is engaged with one of the first gear groove 1192 and the second gear groove 1193.

[0038] When the stroller in this embodiment is unfolded, as shown in Figures 1 to 5, the push bar 113 and the front wheel bracket 111 extend in substantially the same direction when the stroller is facing forward, so that pushing the push bar 113 forward moves the stroller forward. As shown in Figures 10 to 13, when the stroller is facing backward, the push bar 113 and the rear wheel bracket 112 extend in substantially the same direction.

[0039] When the stroller is transformed from the unfolded state to the folded state, as shown in Figures 14 to 19, the push bar 113 bends downward around the central rotating shaft 1131, the folding pull rod 116 tends to move upward, and the front wheel bracket 111 and the rear wheel bracket 112 gradually move closer to each other. As shown in Figures 14 to 16, in the forward-facing use state, when the frame 1 is in the process of converting 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 within the sliding groove 1132. Instead, the guide column 1162 enters the guide groove 118 from the first entrance end 1181 and slides along the guide groove 118. As shown in Figures 17 to 19, in the backward-facing use state, when the frame 1 is in the process of converting 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 within the sliding groove 1132. Instead, the guide column 1162 enters the guide groove 118 from the second entrance end 1182 and slides along the guide groove 118.

[0040] When the stroller is folded, as shown in Figures 20 to 25, the extension directions of the push bar 113, front wheel bracket 111 and rear wheel bracket 112 are approximately the same, the upper end of the push bar 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 each other in the left-right direction, at which point the volume of the stroller is at its smallest, making it easy to transport and carry.

[0041] In summary, the stroller of the present invention adds a guide column to the top of the folding pull rod, which prevents the seat post from moving up and down when the push bar is reversed, improving the child's experience. The stroller can be folded in both forward and reverse directions, making the folding process simple and the folded stroller small in volume, making it easy to carry.

[0042] The above examples are merely for the purpose of illustrating the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand and practice the contents of the present invention, but are not intended to limit the scope of protection of the present invention. [Explanation of symbols]

[0043] 1, frame 11, side bracket 111, front wheel bracket 1111, first rotating shaft 112, rear wheel bracket 1121, third rotating shaft 113, push bar 1131, central rotating shaft 1132, slide groove 11321, first end 11322, second end 114, seat post 115, rear link 1151, second rotating shaft 116, folding pull rod 1161, fourth rotating shaft 1162, guide column 117, first locking device 1171, lock tongue 1172, elastic part 1173, rear lock hole 1174, front lock hole 1175, lock tongue drive part 118, guide groove 1181, first inlet end 1182, second inlet end 1183, notch 1184, limit block 119, second locking device 1191, intermediate gear 1192, first gear groove 1193, second gear groove 2, front wheel assembly 3, rear wheel assembly 4, tie rod

Claims

1. A stroller having an unfolded state and a folded state, the stroller comprising a frame having side brackets located on both the left and right sides, a front wheel assembly, and a rear wheel assembly, The side bracket, in an unfolded state, a front wheel bracket on the lower part of which the front wheel assembly is mounted; a rear wheel bracket on the lower part of which the rear wheel assembly is mounted; a push bar having a lower end connected to the upper end of the front wheel bracket and the upper end of the rear wheel bracket so as to be rotatable relative to each other, and having a slide groove formed in the lower end; a seat post used to connect a seat for a child to sit on, the seat post having a front end pivotally connected to the front wheel bracket; a rear link having a front end pivotally connected to the seat post and a rear end pivotally connected to the rear wheel bracket; a folding pull rod whose lower end is pivotally connected to the seat post and / or the rear link, whose upper end is provided with a guide column, and whose guide column is inserted into the slide groove; a first locking device having a locking operation state that prohibits the push bar from rotating relative to the front wheel bracket and / or the rear wheel bracket, and an unlocking operation state that allows the push bar to rotate relative to the front wheel bracket and / or the rear wheel bracket, the stroller has a forward-facing use state and a rear-facing use state, and when the first locking device is in an unlocking operation state, the push bar rotates forward or rearward relative to the front wheel bracket and the rear wheel bracket so that the stroller is transformed between the rear-facing use state and the forward-facing use state, and during the transformation between the rear-facing use state and the forward-facing use state, the upper end of the folding pull rod and the lower end of the push bar are connected to be able to slide and rotate against each other along the slide groove, and in the rear-facing use state, when the first locking device is in the unlocking operation state, the frame is allowed to transform from the unfolded state to the folded state, and in the forward-facing use state, when the first locking device is in the unlocking operation state, the frame is allowed to transform from the unfolded state to the folded state.

2. 2. The stroller of claim 1, wherein the lower end of the push bar is coaxially pivotally connected to the upper end of the front wheel bracket and the upper end of the rear wheel bracket via a central rotation shaft, the slide groove is located below the central rotation shaft, and the slide groove has an end away from the central rotation shaft and an end close to the central rotation shaft.

3. The stroller according to claim 2, wherein the length of the slide groove extends in a radial direction of the central rotation shaft.

4. 3. The stroller according to claim 2, wherein a guide groove is formed around the central rotation shaft at an upper end of the rear wheel bracket.

5. 5. The stroller of claim 4, wherein both ends of the guide groove are a first entrance end and a second entrance end, and when in the forward-facing state, the guide column is located at the first entrance end, and when in the forward-facing state, during the transition of the frame from the unfolded state to the folded state, the guide column does not slide within the sliding groove, but enters the guide groove from the first entrance end and slides along the guide groove; and when in the rear-facing state, the guide column is located at the second entrance end, and when in the rear-facing state, during the transition of the frame from the unfolded state to the folded state, the guide column does not slide within the sliding groove, but enters the guide groove from the second entrance end and slides along the guide groove.

6. 6. The stroller of claim 5, wherein the upper end of the rear wheel bracket between the first entrance end and the second entrance end has a notch, the notch is used in the process of converting the stroller between a rear-facing use state and a forward-facing use state, and the guide column moves within the notch.

7. The first locking device is a lock tongue provided in an internal cavity below the push bar so as to be slidable along the length of the push bar, and having an elastic part abutting against the push bar; a front lock hole that is opened at an upper end of the front wheel bracket or an upper end of the rear wheel bracket, the hole opening direction being in a radial direction of the central rotation shaft, and into which the lock tongue is inserted and the first lock device is in a locking operating state when the stroller is in the forward use state; a rear lock hole that is opened at an upper end of the front wheel bracket or an upper end of the rear wheel bracket, the hole opening direction being in a radial direction of the central rotation shaft, and into which the lock tongue is inserted and the first locking device is in a locking operating state when the stroller is in the rearward facing use state; a lock tongue driving part connected to the lock tongue, which, after the lock tongue is pulled to disengage from the front locking hole or the rear locking hole, when the first locking device is in an unlocking operation state, applies an elastic force to the lock tongue, causing the lock tongue to have a tendency to be inserted into the front locking hole or the rear locking hole; 3. The stroller according to claim 2, further comprising:

8. a first rotating shaft pivotally connected to the front end of the seat post and the front wheel bracket, the first rotating shaft being located below the central rotating shaft; a front end of the rear link is pivotally connected to the seat post via a second rotating shaft, the second rotating shaft being located rearward of the first rotating shaft; a rear end of the rear link is pivotally connected to the rear wheel bracket via a third rotating shaft, the third rotating shaft being located below the central rotating shaft; 3. The stroller of claim 2, wherein the lower end of the folding pull rod is pivotally connected to the seat post and / or the rear link via a fourth rotating shaft, and the guide column is located at the lower part of the central rotating shaft.

9. 9. The stroller of claim 8, wherein the fourth rotating shaft and the second rotating shaft are a common rotating shaft having the same axis, and the lower end of the folding pull rod is coaxially pivotally connected to the front end of the rear link and the seat post via the common rotating shaft.

10. 2. The stroller of claim 1, wherein the side bracket further comprises a second locking device disposed between the front wheel bracket and the rear wheel bracket, the second locking device having a locking state and an unlocking state, in which the frame is locked in the unfolded state, and when the first locking device and the second locking device are both in the unlocking state, the stroller is allowed to be transformed from the unfolded state to the folded state in the rear-facing use state, and is also allowed to be transformed from the unfolded state to the folded state in the forward-facing use state.

11. 2. The stroller according to claim 1, wherein a tie rod is connected between the left and right side brackets.

12. A method for folding a stroller according to any one of claims 1 to 11, comprising the steps of: A stroller folding method characterized in that, when both the first locking device and the second locking device are in an unlocking operation state, the stroller is operated so that it can be converted from the unfolded state to the folded state whether in the rear-facing use state or the forward-facing use state.

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