Folding stroller

Abstract

The present application relates to a kind of folding stroller, including the frame with unfolded state and folding state, front wheel assembly and rear wheel assembly are arranged in the bottom of the frame, the frame at least includes in unfolded state respectively along the upper and lower direction and extends front support, rear support and push rod frame, the front support includes two front support rods separately arranged in left and right sides and all along the upper and lower direction and extends, the bottom of each front support rod is equipped with a group of front wheel assembly, in the process of the frame being converted from unfolded state to folding state, the front support, the rear support and the push rod frame are folded along front and back direction, the rear support and the push rod frame along left and right direction width is constant, the lower portion of two sides front support rod is close along left and right direction, so that the distance between two groups of front wheel assembly is reduced, while the front support along left and right direction width reduces, the width of folding frame along left and right direction mainly depends on the width of rear support and push rod frame.

Description

TECHNICAL FIELD

[0001] The present application relates to a folding stroller. BACKGROUND

[0002] In order to reduce the size of the stroller after folding, many strollers can be folded in the left-right direction in addition to being folded longitudinally. However, such a configuration often increases the number of rods of the stroller, complicates the structure of the stroller frame, increases the weight of the stroller, and makes the folding operation cumbersome. SUMMARY

[0003] The present application aims to provide an improved folding stroller to solve one or more problems in the prior art.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present application is: a folding stroller, comprising a stroller frame having an unfolded state and a folded state, a front wheel assembly and a rear wheel assembly arranged at the bottom of the stroller frame, the stroller frame comprising at least a front support, a rear support and a push rod frame each extending in the up-down direction in the unfolded state, the lower part of the push rod frame being rotatably connected to the upper part of the rear support, the rear wheel assembly being arranged at the bottom of the rear support, the front support comprising two front support rods arranged on the left and right sides and each extending in the up-down direction, a set of front wheel assemblies being arranged at the bottom of each front support rod, the upper part of the front support rod being rotatably connected to the upper part of the rear support or the lower part of the push rod frame, during the conversion of the stroller frame from the unfolded state to the folded state, the front support, the rear support and the push rod frame are folded in the front-rear direction, the width of the rear support and the push rod frame in the left-right direction is constant, and the lower parts of the front support rods on both sides are moved closer in the left-right direction, so that the distance between the two sets of front wheel assemblies is reduced.

[0005] Preferably, in the unfolded state of the stroller frame, the front support rods extend outwardly in the left-right direction from top to bottom; in the folded state of the stroller frame, the front support rods extend inwardly in the left-right direction from top to bottom.

[0006] Preferably, the rear wheel assembly has two sets arranged on the left and right sides of the bottom of the rear support, in the unfolded state of the stroller frame, the distance between the two sets of front wheel assemblies in the left-right direction is greater than the distance between the two sets of rear wheel assemblies in the left-right direction; in the folded state of the stroller frame, the two sets of front wheel assemblies are located between the two sets of rear wheel assemblies in the left-right direction.

[0007] Further, the stroller frame further comprises a linkage mechanism, during the rotation and folding of the push rod frame relative to the rear support, the linkage mechanism links to rotate and fold the front support rearward toward the rear support, and to move the lower parts of the front support rods on both sides toward each other in the left-right direction.

[0008] Preferably, the lower part of the push rod frame is rotatably connected to the upper part of the rear support about a first axis line extending in the left-right direction; the front support rod is rotatably connected to the lower part of the push rod frame about a second axis line extending in the left-right direction and downwardly and outwardly in the unfolded state of the frame, and the front support rod rotates inwardly about the second axis line in the left-right direction during the transition of the frame from the unfolded state to the folded state.

[0009] Further, the frame further comprises a linkage frame located between the front support rods in the left-right direction, the upper part of the linkage frame being rotatably connected to the lower part of the push rod frame about a third axis line parallel to the first axis line and below the first axis line; and two connecting rods, one end of each of the connecting rods being rotatably connected to the front support rod about a fourth axis line, and the other end of each of the connecting rods being rotatably connected to the lower part of the linkage frame about a fifth axis line, the fourth and fifth axis lines being parallel to each other and extending in the up-down direction.

[0010] Further, the fourth / fifth axis line is perpendicular to the length direction of the front support rod and perpendicular to the first axis line.

[0011] Further, the linkage frame comprises an upper cross rod and a lower cross rod each extending in the left-right direction, and a connecting rod fixed between the upper and lower cross rods, the lower part of the push rod frame being rotatably connected to the upper cross rod about the third axis line which is collinear with or parallel to the axis line of the upper cross rod; and the two connecting rods each being rotatably connected to the two end parts of the lower cross rod about the fifth axis line.

[0012] Further preferably, the length of the upper cross rod is greater than that of the lower cross rod, the two connecting rods and the lower cross rod extending in the same length direction in the unfolded state of the frame, and the two connecting rods extending in the up-down direction and below the lower cross rod in the folded state of the frame.

[0013] Preferably, in the left-right direction, the upper part of the front support rod is connected to the outer side of the push rod frame; the frame further comprises a push handle frame, the lower part of the push handle frame being rotatably connected to the upper part of the push rod frame about a sixth axis line parallel to the first axis line, and the push handle frame and the push rod frame being folded together and behind the rear support in the folded state of the frame.

[0014] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: When the folding trolley of the present invention is folded, the front support is folded in the left and right direction, while the rear support and push rod frame are not folded in the left and right direction. The width of the folded frame is basically the same as the width of the rear support and push rod frame. In this way, the number of frame members is reduced as much as possible while the frame is folded laterally. Attached Figure Description

[0015] Appendix Figure 1 This is a three-dimensional structural diagram of a folding trolley in its unfolded state according to a specific embodiment of the present invention.

[0016] Appendix Figure 2 For the appendix Figure 1 An exploded view of the components of a folding trolley;

[0017] Appendix Figure 3 For the appendix Figure 1 A front view diagram of the folding cart in its unfolded state;

[0018] Appendix Figure 4 For the appendix Figure 3 A side view of the folding trolley;

[0019] Appendix Figure 5 For the appendix Figure 1 A front view diagram of the folding cart after the first step of the folding process is completed;

[0020] Appendix Figure 6 For the appendix Figure 5 A side view diagram;

[0021] Appendix Figure 7 For the appendix Figure 1 A front view of the folding trolley during the second folding process;

[0022] Appendix Figure 8 For the attached Figure 7 Schematic diagram of the sectional view along the central AA direction;

[0023] Appendix Figure 9 For the appendix Figure 1 A three-dimensional structural diagram of a folding trolley in its folded state;

[0024] Appendix Figure 10 For the appendix Figure 9 Front view diagram;

[0025] Appendix Figure 11 For the appendix Figure 9 A side view diagram;

[0026] The components are: 100, frame; 200, front wheel assembly; 300, rear wheel assembly;

[0027] 1, front support; 11, front support rod; 12, front connecting head; 2, rear support; 21, rear support rod; 3, push rod holder; 31, push rod; 32, front cross rod; 4, linkage mechanism; 41, linkage holder; 411, upper cross rod; 412, lower cross rod; 412a, main body; 412b, rod sleeve; 413, connecting rod; 42, connecting rod; 5, push handle holder; 51, push handle rod;

[0028] X1, first axis; X2, second axis; X3, third axis; X4, fourth axis; X5, fifth axis; X6, sixth axis. DETAILED DESCRIPTION

[0029] The following description of up, down, left, right, front, back, inner, outer and other directions is based on the observation of a person pushing the folding stroller in an unfolded state, and is only for the purpose of clearly describing the relative position of the rods and components on the folding stroller.

[0030] The technical solutions of the present application will be further described below in conjunction with the drawings and specific embodiments.

[0031] Referring to Figures 1 to 11 The folding stroller shown in the drawings comprises a frame 100 having an unfolded state and a folded state, a front wheel assembly 200 and a rear wheel assembly 300 arranged at the bottom of the frame 100, the frame 100 comprising at least a front support 1, a rear support 2 and a push rod holder 3 each extending in the up-down direction in the unfolded state, the lower part of the push rod holder 3 being rotatably connected to the upper part of the rear support 2, and the rear wheel assembly 300 being arranged at the bottom of the rear support 2. The front support 1 comprises two front support rods 11 arranged on the left and right sides and each extending in the up-down direction, a set of front wheel assemblies 200 being arranged at the bottom of each front support rod 11, and the upper part of the front support rod 11 being rotatably connected to the upper part of the rear support 2 or the lower part of the push rod holder 3. During the conversion of the frame 100 from the unfolded state to the folded state, the front support 1, the rear support 2 and the push rod holder 3 are folded in the front-back direction, the width of the rear support 2 and the push rod holder 3 in the left-right direction remains constant, the lower parts of the two front support rods 11 on the left and right sides are moved closer in the left-right direction, and the distance between the two sets of front wheel assemblies 200 is reduced, so that the width of the folded frame 100 is reduced.

[0032] Referring to the drawings, the detailed structure of the folding stroller frame 100 of the present embodiment is as follows:

[0033] The lower part of the push rod holder 3 is rotatably connected to the upper part of the rear support 2 about the first axis X1, the front support rod 11 is rotatably connected to the lower part of the push rod holder 3 about the second axis X2, the first axis X1 extends in the left-right direction, and the second axis X2 extends downwardly and inwardly from the outside to the inside in the left-right direction when the frame 100 is in the unfolded state.

[0034] In the embodiment, the push rod frame 3 comprises two push rods 31 extending rearwardly and downwardly in the unfolded state, and a front cross rod 32 extending in the left-right direction, the two push rods 31 are arranged in parallel and located on the left and right sides respectively, and the front cross rod 32 is fixedly arranged between the lower ends of the two push rods 31; the rear support frame 2 comprises two rear support rods 21 extending in the up-down direction and arranged on the left and right sides respectively, the two rear support rods 21 are arranged in parallel, and the two rear wheel assemblies 300 are arranged on the bottom of the two rear support rods 21 respectively. The lower part of the push rod 31 is rotatably connected to the upper end of the rear support rod 21 on the left and right sides of the frame 100 about the first axis X1, and the front support rod 11 is rotatably connected to the lower part of the push rod 31 about the second axis X2.

[0035] Referring to Figures 1 to 3 As shown in the figure, the connection between the rear support rod 21 and the push rod 31, and the connection between the front support rod 11 and the push rod 31 are all located above the front cross rod 32 along the length direction of the push rod 31; the front support rod 11 is rotatably connected to the outside of the push rod frame 3 in the left-right direction, and the rear support frame 2 is rotatably connected to the inside of the two push rods 31 in the left-right direction.

[0036] Referring to Figures 1 to 3 As shown in the figure, the frame 100 further comprises a linkage mechanism 4, which is used to link the front support frame 1 to rotate and fold relative to the rear support frame 2, and to link the lower parts of the front support rods 11 on the left and right sides to move towards each other in the left-right direction during the folding of the push rod frame 3 relative to the rear support frame 2, so as to realize the folding of the front support frame 1 in the left-right direction.

[0037] Specifically, the linkage mechanism 4 comprises a linkage frame 41 and two connecting rods 42, wherein the linkage frame 41 is located between the front support rods 11 on the left and right sides in the left-right direction, and the upper part of the linkage frame 41 is rotatably connected to the lower part of the push rod frame 3 about the third axis X3; the two connecting rods 42 are arranged on the left and right sides of the linkage frame 41 respectively, one end of the connecting rod 42 is rotatably connected to the front support rod 11 about the fourth axis X4, and the other end of the connecting rod 42 is rotatably connected to the lower part of the linkage frame 41 about the fifth axis X5. In the embodiment, the linkage frame 41 comprises an upper cross rod 411 and a lower cross rod 412 extending in the left-right direction respectively, and a connecting rod 413 fixedly arranged between the upper cross rod 411 and the lower cross rod 412, the lower part of the push rod frame 3 is rotatably connected to the upper cross rod 411 about the third axis X3, and the third axis X3 is co-linear with the axis of the upper cross rod 411 or parallel to each other; the two connecting rods 42 are rotatably connected to the two ends of the lower cross rod 412 about the fifth axis X5 respectively.

[0038] In this embodiment, the upper crossbar 411 has a hollow cavity extending along its length. The front crossbar 32 of the push rod frame 3 is slidably fitted into this hollow cavity. The axis of the upper crossbar 411, the axis of the front crossbar 32, and the third axis X3 extend collinearly. The push rod frame 3 can rotate relative to the upper crossbar 411 around its own axis. The third axis X3 is parallel to the first axis X1, and both extend horizontally in the left-right direction. When the frame 100 is in the unfolded state, the third axis X3 is located below the first axis X1.

[0039] In this embodiment, the lower crossbar 412 includes a main body 412a and a sleeve 412b. The sleeve 412b also has a cavity extending along its own length. The main body 412a is slidably fitted into the cavity. The axis of the main body 412a and the axis of the sleeve 412b extend collinearly. The main body 412a can rotate around its own axis and relative to the sleeve 412b.

[0040] See Figure 1 , Figure 3 As shown, in this embodiment, the connecting rod 413 extends in the vertical direction, with its upper end connected to the middle of the upper crossbar 411 and its lower end connected to the middle of the rod sleeve 412b. The length of the upper crossbar 411 is greater than the length of the lower crossbar 412, and the linkage frame 41 is in the shape of an "I".

[0041] In this embodiment, the front bracket 1 is further provided with a front connector 12, which includes two sets located on the left and right sides of the frame 100. The front connector 12 is connected to the lower part of the front support rod 11 and extends horizontally inward in the left-right direction. One end of the two connecting rods 42 is rotatably connected to the front connector 12 on the same side around the fourth axis X4, and the other end is rotatably connected to the same side end of the main body 412a of the lower crossbar 412 around the fifth axis X5. The aforementioned fourth axis X4 and fifth axis X5 are parallel to each other and both extend in the vertical direction. At the same time, the extension direction of the two is perpendicular to the length extension direction of the front support rod 11 and the first axis X1.

[0042] The frame 100 also includes a handlebar holder 5, the lower part of which is rotatably connected to the upper part of the pushrod holder 5 about a sixth axis X6. See specifically... Figure 1 , Figure 2 As shown, the push handle frame 5 includes two push handle rods 51 located on the left and right sides. In the unfolded state, both push handle rods 51 extend backward from bottom to top. In this embodiment, the two push handle rods 51 are integrally set and form a U-shaped rod with the opening facing downward in the unfolded state. On each side of the frame 100, the lower end of the push handle rod 51 and the upper end of the push rod 41 are rotatably connected together around the sixth axis X6. The sixth axis X6 extends horizontally in the left and right direction and is parallel to the first axis X1.

[0043] The frame 100 is in the unfolded state, see [reference]. Figures 1 to 5 As shown, the push rod frame 3 and the push handle frame 5 extend forward from top to bottom along the same length direction, and the front support rod 11 extends outward from top to bottom along the left and right directions. Along the left and right directions, the upper crossbar 411 is located between the two front support rods 11, and the two connecting rods 42 and the lower crossbar 412 extend along the same length direction. Located at the bottom of the frame 100, the front wheel assembly 200 is located in front of the rear wheel assembly 300, and the two are supported on the ground together. The distance between the two sets of front wheel assemblies 200 in the left and right directions is greater than the distance between the two sets of rear wheel assemblies 300 in the left and right directions. In this state, pushing the push handle frame 5 can drive the cart forward.

[0044] When folding the frame 100, see [link / reference]. Figures 6 to 9 As shown, first, the push handle frame 5 is flipped forward and folded relative to the push rod frame 3. Then, the user can flip the folded push rod frame 3 and push handle frame 5 together backward and fold them relative to the rear support 2. During the process of the push rod frame 3 rotating and folding relative to the rear support 2, the linkage mechanism 4 is activated, causing the front support 1 to rotate inward along the second axis X2 in the left-right direction while simultaneously rotating backward toward the rear support 2. Specifically, during the process of the push rod frame 3 flipping backward, the front crossbar 32 rotates backward around the first axis X1 and drives the upper crossbar 411 to move upward. The upper crossbar 411 drives the entire linkage mechanism. As the frame 41 moves upward, the upper crossbar 411 and the front crossbar 32, as well as the main body 412a and the sleeve 412b of the lower crossbar 412, all rotate relative to each other. During the movement, the lower crossbar 412 drives its connection with the connecting rod 42 to move upward together, causing the two connecting rods 42 to rotate downward relative to each other around the fifth axis X5. The two connecting rods 42 drive the lower parts of the front support rods 11 on both sides to move towards each other in the left and right directions through the front connectors 12 on each side. While moving towards each other, the front support rods 11 on both sides rotate backward around the second axis X2 and retract relative to the rear support 2.

[0045] When folding the frame 100, the user can also lift the upper crossbar 411 directly after folding the push handle 5 and push rod 3 together. This allows the front support 1 to fold in the left and right directions and to fold back relative to the rear support 2. During the lifting process, the upper crossbar 411 will also cause the folded push handle 5 and push rod 3 to flip backward and fold back relative to the rear support 2, so that the frame 100 can be folded up as a whole during the lifting process.

[0046] The frame 100 in its folded state, see [link / reference]. Figures 10 to 11As shown, the front support 1, the rear support 2, the push rod support 3 and the push handle support 5 are folded together in the front-rear direction, wherein the front support 1 is folded in front of the rear support 2, the push handle support 5 and the push rod support 3 are folded together and in rear of the rear support 2; the two front support rods 11 of the front support 1 extend inwardly in the left-right direction from top to bottom, the two connecting rods 42 extend in the up-down direction and below the lower cross rod 412, the two groups of front wheel assemblies 200 below the front support 1 are between the two groups of rear wheel assemblies 300 in the left-right direction, the lower part of the push handle support 5 is supported on the ground together with the front wheel assemblies 200 and the rear wheel assemblies 300; the width of the folded rear body is basically the same as the width of the rear support 2 or the push rod support 3, at this time the upper cross rod 411 is above the whole frame 100, the user can directly hold and lift the upper cross rod 411 to carry the frame 100.

[0047] In summary, the folding stroller of the embodiment has less rod members and simple structure, in the folding process, the lower part of the two side front support rods 11 is folded inwardly to approach, so that the width of the front support 1 in the left-right direction is reduced, the width of the folded stroller in the left-right direction is basically the same as the width of the rear support or the push handle support, which realizes the lateral folding of the frame and reduces the number of rod members of the frame as much as possible, which is beneficial to the simplification of the overall structure of the frame and the reduction of the overall weight.

[0048] The above embodiments are only for illustrating the technical concept and characteristics of the present application, the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application, any equivalent changes or modifications made according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A folding trolley, comprising a frame having an unfolded state and a folded state, a front wheel assembly and a rear wheel assembly disposed at the bottom of the frame, characterized in that: The frame includes at least a front bracket, a rear bracket, and a push rod bracket, each extending vertically in the unfolded state. The lower part of the push rod bracket is rotatably connected to the upper part of the rear bracket about a first axis extending horizontally. The rear wheel assembly is located at the bottom of the rear bracket. The front support includes two front support rods located on the left and right sides and extending in the vertical direction. Each front support rod has a set of front wheel assemblies at its bottom. The front support rods are rotatably connected to the lower part of the push rod frame around a second axis. When the frame is in the unfolded state, the second axis extends downward from the outside to the inside in the left and right direction. The chassis also includes: A linkage frame is located between the front support rods on both sides in the left-right direction. The upper part of the linkage frame is rotatably connected to the lower part of the push rod frame around a third axis line. The third axis line is parallel to the first axis line and is located below the first axis line. The connecting rod has two rods respectively disposed on the left and right sides of the linkage frame. One end of the connecting rod is rotatably connected to the front support rod around a fourth axis, and the other end of the connecting rod is rotatably connected to the lower part of the linkage frame around a fifth axis. The fourth axis and the fifth axis are parallel to each other and both extend in the vertical direction. During the transition of the frame from the unfolded state to the folded state, the front support, the rear support, and the push rod frame retract in the front-to-back direction. The width of the rear support and the push rod frame in the left-to-right direction remains constant. The front support rod rotates inward in the left-to-right direction around the second axis, and the lower parts of the front support rods on both sides move closer in the left-to-right direction, thereby reducing the distance between the two sets of front wheel assemblies.

2. The folding trolley according to claim 1, characterized in that: When the frame is in the unfolded state, the front support rod extends outward from top to bottom along the left and right directions; when the frame is in the folded state, the front support rod extends inward from top to bottom along the left and right directions.

3. The folding trolley according to claim 1, characterized in that: The rear wheel assembly has two sets located on the left and right sides of the bottom of the rear support. When the frame is in the unfolded state, the distance between the two sets of front wheel assemblies in the left and right direction is greater than the distance between the two sets of rear wheel assemblies in the left and right direction. When the frame is in the folded state, the two sets of front wheel assemblies are located between the two sets of rear wheel assemblies in the left and right direction.

4. The folding trolley according to claim 1, characterized in that: The frame also includes a linkage mechanism. During the rotation and retraction of the push rod frame relative to the rear support, the linkage mechanism causes the front support to rotate and retract toward the rear support, and causes the lower parts of the front support rods on both sides to move toward each other in the left-right direction.

5. The folding trolley according to claim 1, characterized in that: The fourth axis / the fifth axis is perpendicular to the length extension direction of the front support rod and is perpendicular to the first axis.

6. The folding trolley according to claim 5, characterized in that: The linkage frame includes an upper crossbar and a lower crossbar extending in the left-right direction, and a connecting rod fixed between the upper crossbar and the lower crossbar. The lower part of the push rod frame is rotatably connected to the upper crossbar around the third axis, which extends collinearly with or parallel to the axis of the upper crossbar. The two connecting rods are rotatably connected to the two ends of the lower crossbar around the fifth axis.

7. The folding trolley according to claim 6, characterized in that: The length of the upper crossbar is greater than the length of the lower crossbar. When the frame is in the unfolded state, the two connecting rods and the lower crossbar extend along the same length direction. When the frame is in the folded state, the two connecting rods extend in the vertical direction and are located below the lower crossbar.

8. The folding trolley according to claim 1, characterized in that: Along the left-right direction, the upper part of the front support rod is connected to the outside of the push rod frame; the frame also includes a push handle frame, the lower part of the push handle frame is rotatably connected to the upper part of the push rod frame about a sixth axis line, the sixth axis line is parallel to the first axis line, the frame is in a folded state, the push handle frame and the push rod frame are retracted to each other and retracted behind the rear support.

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