Stroller

Abstract

The present application relates to a kind of child stroller, its frame includes front support, side pole frame, rear support, support frame, rear support frame, push rod frame, connecting frame and bottom support frame, wherein, the lower portion of side pole frame is rotatably connected with the upper portion of front support, the upper portion of side pole frame is rotatably connected on push rod frame, the upper portion of support frame is rotatably connected with the lower portion of side pole frame;Rear support can be slidably arranged on support frame along the length extension direction of support frame;The rear portion of bottom support frame is rotatably connected with the lower portion of support frame, the front portion of the bottom support frame is rotatably connected with first sliding member, and first sliding member is slidably arranged on front support;Rear support frame is rotatably connected with support frame, the upper portion of rear support frame is rotatably connected with the lower portion of push rod frame, the lower portion of rear support frame is rotatably connected with second sliding member, and second sliding member is slidably arranged on bottom support frame;Connecting frame is rotatably connected between second sliding member and rear support frame, and rear support can be folded up and stored relative to support frame when frame is folded.

Description

Technical Field

[0001] This invention relates to the field of children's products, and more specifically to a children's stroller. Background Technology

[0002] Existing strollers have a variety of structures, with different numbers of rods and connections. Consequently, their folding principles, folded shapes, and folded dimensions also vary. The goal that has been continuously pursued by those skilled in the art is to make the stroller frame as simple as possible, folding operation as convenient, and folded size as small as possible while ensuring good stability and normal use performance. Summary of the Invention

[0003] The purpose of this invention is to provide a new type of stroller.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: a children's stroller, 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, wherein the frame in the unfolded state includes:

[0005] A front support bracket that extends rearward at an angle from bottom to top, with the front wheel assembly located at the lower part of the front support bracket;

[0006] A side support frame, which extends backward at an angle from bottom to top, and the lower part of the side support frame is rotatably connected to the upper part of the front support frame;

[0007] A push rod frame that extends backward at an angle from bottom to top, with the upper part of the side rod frame rotatably connected to the push rod frame;

[0008] A support frame that extends forward at an angle from bottom to top, with its upper part rotatably connected to the lower part of the side frame;

[0009] The rear support extends forward at an angle from bottom to top, the rear wheel assembly is located at the lower part of the rear support, and the rear support is slidably mounted on the support frame along the length extension direction of the support frame.

[0010] A bottom support frame extends in a front-to-back direction, the rear part of the bottom support frame is rotatably connected to the lower part of the support frame, and the front part of the bottom support frame is rotatably connected to a first sliding member, which is slidably mounted on the front support frame along the length extension direction of the front support frame.

[0011] The rear support frame extends vertically and is rotatably connected to the support frame. The upper part of the rear support frame is rotatably connected to the lower part of the push rod frame. The lower part of the rear support frame is rotatably connected to a second sliding member, which is slidably disposed on the bottom support frame along the length extension direction of the bottom support frame.

[0012] A connecting frame, one end of which is rotatably connected to the second sliding member, and the other end of which is rotatably connected to the rear support.

[0013] Preferably, the support frame and the rear support extend parallel to each other or along the same length direction, and the support frame and the rear support are slidably connected to each other along the length direction. During the process of the vehicle frame changing from an unfolded state to a folded state, the rear support slides upward along the support frame.

[0014] Preferably, during the process of the frame changing from an unfolded state to a folded state, the rear support frame and the side rod frame flip backward, the first sliding member slides upward along the front support frame, the second sliding member slides forward along the bottom support frame, and the rear support frame slides upward along the support frame, so that the front support frame, the bottom support frame, the rear support frame, the support frame, the rear support frame, the side rod frame, and the push rod frame are folded together in the front-to-back direction.

[0015] In some embodiments, the frame is in a folded state, the rear wheel assembly is suspended, and the lower part of the support frame and the lower part of the push rod frame are jointly supported on the ground.

[0016] In some embodiments, the frame further includes a seat frame extending in a front-rear direction in an unfolded state, the rear of the seat frame being rotatably connected to the rear support frame, and a third slider being rotatably disposed on the side frame, the third slider being slidably disposed on the seat frame along the length extension direction of the seat frame.

[0017] In some embodiments, the front support includes two front struts respectively disposed on the left and right sides and both extending in the vertical direction; the side strut frame includes two side struts respectively disposed on the left and right sides and both extending in the vertical direction; the support frame includes two support struts respectively disposed on the left and right sides; on each side of the vehicle frame, the upper part of the front strut and the lower part of the side strut are rotatably connected about a first rotation center line; the upper part of the support strut and the lower part of the side strut are rotatably connected about a second rotation center line; the first rotation center line and the second rotation center line extend parallel to each other or collinearly.

[0018] In some embodiments, the lower part of the side rod has a first connector and a second connector, and the upper part of the front support rod is fixed with a third connector. When the frame is in the unfolded state, the first connector extends downward and forward from the lower part of the side rod, the second connector extends downward and backward from the lower part of the side rod, and the third connector extends downward and backward from the upper part of the front support rod. The first connector and the third connector are rotatably connected about a first rotation center line. The upper part of the support rod is rotatably connected to the second connector about a second rotation center line. The first rotation center line is located below the second rotation center line. The upper end of the front support rod abuts against the lower end of the side rod.

[0019] In some embodiments, the rear support includes two rear support rods disposed on the left and right sides, and a set of rear wheel assemblies is provided at the bottom of each rear support rod; the rear support rod and the support rod on the same side extend parallel to each other or along the same length direction, and the rear support rod and the support rod are slidably connected to each other along the length direction; the connecting frame includes two connecting rods disposed on the left and right sides; the bottom support frame includes two bottom support rods disposed on the left and right sides and extending in the front-rear direction; on each side of the frame, the first sliding member is slidably disposed on the front support rod; the second sliding member is slidably disposed on the bottom support rod; the front part of the bottom support rod is rotatably connected to the first sliding member; the rear part of the bottom support rod is rotatably connected to the lower part of the support rod about a third rotation center line; one end of the connecting rod is rotatably connected to the second sliding member about a fourth rotation center line; and the other end of the connecting rod is rotatably connected to the rear support rod about a fifth rotation center line.

[0020] In some embodiments, the rear support frame includes two rear support rods respectively disposed on the left and right sides and extending in the vertical direction, and the push rod frame includes two push rods respectively disposed on the left and right sides and extending in the vertical direction. On each of the left and right sides of the frame, the upper part of the side rod is rotatably connected to the push rod about a sixth rotation center line. The rear support rod and the support rod intersect each other and are rotatably connected about a seventh rotation center line at the intersection. The upper part of the rear support rod and the lower part of the push rod are rotatably connected about an eighth rotation center line. The lower part of the rear support rod is rotatably connected to the second sliding member about a ninth rotation center line. The sixth rotation center line and the eighth rotation center line are parallel to each other, and the ninth rotation center line and the fourth rotation center line extend parallel to each other or collinearly.

[0021] In some embodiments, the rear support rod has a hollow rod cavity extending along its own length direction, and the rear support rod is slidably fitted onto the support rod along its own length direction. The lower part of the support rod passes through the lower part of the rear support rod and is rotatably connected to the rear part of the bottom support rod.

[0022] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: In the stroller of the present invention, during the folding process, the rear support can slide upward relative to the support frame, so that the rear wheel assembly can be lifted upward, thereby reducing the size of the folded stroller frame and bringing convenience to the user's daily carrying and use. Attached Figure Description

[0023] Appendix Figure 1 This is a three-dimensional structural diagram of a children's stroller in its unfolded state according to a specific embodiment of the present invention;

[0024] Appendix Figure 2 For the appendix Figure 1 A side view diagram of the structure of a children's stroller;

[0025] Appendix Figure 3 For the appendix Figure 1 A schematic diagram showing the rotation center lines based on the above;

[0026] Appendix Figure 4 For the appendix Figure 1 A three-dimensional structural diagram of a stroller in a semi-folded state;

[0027] Appendix Figure 5 For the appendix Figure 4 A side view diagram of the structure of a children's stroller;

[0028] Appendix Figure 6 For the appendix Figure 1 A 3D structural diagram of a stroller in its folded state;

[0029] Appendix Figure 7 For the appendix Figure 6 A side view diagram of the structure of a children's stroller;

[0030] Among them: 1. Front bracket; 11. Front support rod; 12. Front crossbar; 13. Third connector;

[0031] 2. Side frame; 21. Side rod; 22. First connector; 23. Second connector;

[0032] 3. Rear bracket; 31. Rear support rod;

[0033] 4. Support frame; 41. Support rod; 42. Rear crossbar; 43. Fourth connector;

[0034] 5. Rear support frame; 51. Rear support rod;

[0035] 6. Push rod holder; 61. Push rod; 61a. Lower push rod; 61b. Middle push rod; 61c. Upper push rod; 62. Upper crossbar; 63. Handle bar;

[0036] 7. Connecting frame; 71. Connecting rod;

[0037] 8. Base support frame; 81. Base support rod;

[0038] 9. First sliding member; 10. Second sliding member;

[0039] 20. Seat frame; 201. Seat post; 202. Third sliding component;

[0040] 30. Front wheel assembly; 40. Rear wheel assembly. Detailed Implementation

[0041] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0042] The following descriptions of directions such as front, back, left, right, up, and down are defined with reference to the directions observed by the user when pushing the stroller with the frame in the unfolded state. The purpose is solely to clearly illustrate the relative positional relationships of the various rods / components in the stroller.

[0043] See Figures 1 to 7 The stroller shown includes a frame having an unfolded state and a folded state, a front wheel assembly 30 and a rear wheel assembly 40 located at the bottom of the frame, and a locking mechanism for locking the frame in the unfolded state.

[0044] The frame includes a front support 1, side struts 2, rear support 3, support frame 4, rear support frame 5, push rod frame 6, connecting frame 7, and bottom support frame 8. The frame is in its unfolded state. (See attached image.) Figures 1 to 3 As shown, the front support 1 extends backward at an angle from bottom to top, and the front wheel assembly 30 is located at the bottom of the front support 1; the side rod 2 extends backward at an angle from bottom to top, and the lower part of the side rod 2 is rotatably connected to the upper part of the front support 1; the push rod 6 extends backward at an angle from bottom to top, and the upper part of the side rod 2 is rotatably connected to the push rod 6; the support frame 4 and the rear support 3 each extend forward at an angle from bottom to top, and the rear wheel assembly 40 is located at the lower part of the rear support 3. The rear support 3 is slidably mounted on the support frame 4 along the length extension direction of the support frame 4. Specifically, the support frame 4 and the rear support 3 are parallel to each other or extend along the same length direction, so that the two are slidably connected to each other along the length direction.

[0045] The upper part of the support frame 4 is rotatably connected to the lower part of the side rod frame 2; the bottom support frame 8 extends in the front-rear direction, and the rear part of the bottom support frame 8 is rotatably connected to the lower part of the support frame 4. The front part of the bottom support frame 8 is rotatably connected to a first sliding member 9, which is slidably mounted on the front support 1 along the length extension direction of the front support 1; the rear support frame 5 is rotatably connected to the support frame 4, and the upper part of the rear support frame 5 is rotatably connected to the lower part of the push rod frame 6. The lower part of the rear support frame 5 is rotatably connected to a second sliding member 10, which is slidably mounted on the bottom support frame 8 along the length extension direction of the bottom support frame 8; one end of the connecting frame 7 is rotatably connected to the second sliding member 10, and the other end is rotatably connected to the rear support 3.

[0046] The frame also includes a seat frame 20 that extends in the front-rear direction when unfolded. The rear of the seat frame is rotatably connected to the rear support frame 5. A third sliding member 202 is rotatably provided on the side frame 2. The third sliding member 202 is slidably provided on the seat frame 20 along the length extension direction of the seat frame 20.

[0047] Specifically, referring to the accompanying drawings, in this embodiment, the rods / components on the frame are arranged as follows:

[0048] The front support 1 includes two front support rods 11 located on the left and right sides and extending in the vertical direction, and a front crossbar 12 fixed between the lower parts of the two front support rods 11 and extending in the horizontal direction. The front wheel assembly 30 has two sets located on the left and right sides. Here, the front wheel assembly 30 is a caster wheel assembly, which is installed on the end of the front crossbar 12.

[0049] The side frame 2 includes two side rods 21 located on the left and right sides and extending in the vertical direction. The support frame 4 includes two support rods 41 located on the left and right sides and extending in the vertical direction. On each side of the frame, the upper part of the front support rod 11 is rotatably connected to the lower part of the side rod 21 around the first rotation center line X1, and the upper part of the support rod 41 is rotatably connected to the lower part of the side rod 21 around the second rotation center line X2. The first rotation center line X1 and the second rotation center line X2 extend parallel to each other or collinearly.

[0050] See here. Figure 2As shown, the lower part of the side rod 21 has a first connector 22 and a second connector 23, and the upper part of the front support rod 11 has a third connector 13. When the frame is in the unfolded state, the first connector 22 extends downward and forward from the lower part of the side rod 21, the second connector 23 extends downward and backward from the lower part of the side rod 21, and the third connector 13 extends downward and backward from the upper part of the front support rod 11. The first connector 22 and the third connector 13 are rotatably connected about the first rotation center line X1. The upper part of the support rod 41 is rotatably connected to the second connector 23 around the second rotation center line X2. The first rotation center line X1 and the second rotation center line X2 are parallel to each other and the first rotation center line X1 is located below the second rotation center line X2. The upper end of the front support rod 11 abuts against the lower end of the side rod 21. When the frame is folded, the lower part of the side rod 21 and the upper part of the front support rod 11 can be separated from each other, which is conducive to the tight folding of other rods on the frame between the front support rod 11 and the side rod 21.

[0051] The rear support 3 includes two rear support rods 31 located on the left and right sides and extending vertically. A set of rear wheel assemblies 40 is provided at the bottom of each rear support rod 31. The rear support rods 31 and support rods 41 on the same side extend parallel to each other or along the same length direction, and are slidably connected along their length. In this embodiment, the rear support rod 31 has a hollow cavity extending along its own length, and can be slidably fitted onto the support rod 41, allowing them to slide relative to each other along their own length. The rear wheel assembly 40 is installed on the rear side of the rear support rod 31. The support frame 4 also includes a rear crossbar 42 fixed between the lower parts of the two support rods 41 and extending horizontally. A fourth connector 43 is fixedly provided at each of the left and right ends of the rear crossbar 42. When the frame is in the unfolded state, the fourth connector 43 extends forward and downward at an angle for rotatably connecting to the rear of the bottom support frame 8.

[0052] The connecting frame 7 includes two connecting rods 71 ​​respectively located on the left and right sides, and the bottom support frame 8 includes two bottom support rods 81 respectively located on the left and right sides and extending in the front-rear direction. On each side of the frame, a first sliding member 9 is slidably mounted on the front support rod 11 along the length extension direction of the front support rod 11, and a second sliding member 10 is slidably mounted on the bottom support rod 81 along the length extension direction of the bottom support rod 81. Here, both the first sliding member 9 and the second sliding member 10 are sliding sleeves.

[0053] The front part of the bottom support rod 81 is rotatably connected to the first sliding member 9, and the rear part of the bottom support rod 81 is rotatably connected to the lower part of the support rod 41 around the third rotation center line X3, specifically rotatably connected to the fourth connector 43; one end of the connecting rod 71 is rotatably connected to the second sliding member 10 around the fourth rotation center line X4, and the other end of the connecting rod 71 is rotatably connected to the rear support rod 31 around the fifth rotation center line X5.

[0054] The push rod frame 6 includes two push rods 61 located on the left and right sides and extending in the vertical direction. Here, the push rods 61 are telescopic rods, specifically including a lower push rod 61a, a middle push rod 61b, and an upper push rod 61c that are slidably connected in sequence. The push rod frame 6 also includes an upper crossbar 62 fixed between the tops of the upper push rods 61c on both sides and extending in the horizontal direction, and push handles 63 located at the left and right ends of the upper crossbar 62 and extending forward. The rear support frame 5 includes two rear support rods 51 located on the left and right sides and extending vertically. On each side of the frame, the upper part of the side rod 21 is rotatably connected to the lower push rod 61a around the sixth rotation center line X6. The rear support frame 5 is located between two sets of support rods 31 in the left-right direction. The rear support rods 51 and the support rods 31 intersect each other and are rotatably connected around the seventh rotation center line X7 at the intersection. The upper part of the rear support rod 51 is rotatably connected to the lower part of the lower push rod 61a around the eighth rotation center line X8. The lower part of the rear support rod 51 is rotatably connected to the second sliding member 10 around the ninth rotation center line X9. In the direction of extension of the lower push rod 61a, the sixth rotation center line X6 is located at the eighth rotation center line X8. The ninth rotation center line X9 extends parallel to or collinear with the fourth rotation center line X4. In the direction of extension of the support rod 41, the seventh rotation center line X7 is located below the second rotation center line X2 and above the fifth rotation center line X5.

[0055] The seat frame 20 includes two seat posts 201 located on the left and right sides and extending in the front-rear direction. On each side of the frame, the rear part of the seat post 201 is rotatably connected to the upper part of the rear support rod 51. A third sliding member 202 is rotatably connected to the side rod 21. The third sliding member 202 is a sliding sleeve that is slidably fitted onto the seat post 201.

[0056] See Figures 1 to 3 As shown, with the frame in the unfolded state, the upper part of the front support 1 abuts against the lower part of the side support 2, the support frame 3 and the bottom support frame 8 extend forward from bottom to top and support the side support 2 and the lower rear of the front support 1, the rear support 3 is located under the support frame 4, and the front wheel assembly 30 and the rear wheel assembly 40 are supported on the ground together.

[0057] When the frame needs to be folded up, see [link / reference]. Figure 4 , Figure 5As shown, the operator can hold the handles 63 on both sides with both hands and press them down, causing the push rods 61 on both sides to shorten in length. At the same time, the push rod frame 6 moves downward as a whole, causing the upper part of the side rod frame 2 and the upper part of the rear support frame 5 to move backward and downward, and the lower part of the rear support frame 5 to move forward and upward, driving the second sliding member 10 to move forward along the bottom support frame 8. Under the action of the connecting frame 7, the rear support 3 slides upward along the support frame 4, causing the bottom support frame 8, the rear support 3, and the support frame 4 to retract in the front-back direction; the first sliding member 9 slides upward along the front support 1, causing the front support 1 to retract backward and the bottom support frame 8 in the front-back direction.

[0058] The folded frame is like Figure 6 , Figure 7 As shown, the front support 1, bottom support 8, rear support 3, support frame 4, rear support frame 5, side rod frame 2, and push rod frame 6 are folded together in the front-to-back direction. The two sets of front wheel assemblies 30 are located between the rod assemblies on the left and right sides of the frame in the left-to-right direction. The two sets of rear wheel assemblies 40 are suspended in the air. The lower part of the support frame 4 and the lower part of the push rod frame 6 are supported on the ground together, forming the self-supporting structure of the folded frame. The height of the folded frame is approximately the same as the length of the support frame 3, and its relatively small size brings convenience to users' daily storage and carrying.

[0059] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A stroller, 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: In its unfolded state, the frame includes: A front support bracket that extends rearward at an angle from bottom to top, with the front wheel assembly located at the lower part of the front support bracket; A side support frame, which extends backward at an angle from bottom to top, and the lower part of the side support frame is rotatably connected to the upper part of the front support frame; A push rod frame that extends backward at an angle from bottom to top, with the upper part of the side rod frame rotatably connected to the push rod frame; A support frame that extends forward at an angle from bottom to top, with its upper part rotatably connected to the lower part of the side frame; The rear support extends forward at an angle from bottom to top, the rear wheel assembly is located at the lower part of the rear support, and the rear support is slidably mounted on the support frame along the length extension direction of the support frame. A bottom support frame extends in a front-to-back direction, the rear part of the bottom support frame is rotatably connected to the lower part of the support frame, and the front part of the bottom support frame is rotatably connected to a first sliding member, which is slidably mounted on the front support frame along the length extension direction of the front support frame. The rear support frame extends vertically and is rotatably connected to the support frame. The upper part of the rear support frame is rotatably connected to the lower part of the push rod frame. The lower part of the rear support frame is rotatably connected to a second sliding member, which is slidably disposed on the bottom support frame along the length extension direction of the bottom support frame. A connecting frame, one end of which is rotatably connected to the second sliding member, and the other end of which is rotatably connected to the rear support. The base support frame includes two base support rods located on the left and right sides, each extending in a front-rear direction. A second sliding member is slidably mounted on the base support rod. The front part of the base support rod is rotatably connected to the first sliding member, and the rear part of the base support rod is rotatably connected to the lower part of the support frame around a third rotation center line. During the transition of the frame from the unfolded state to the folded state, the rear support frame and the side rod frame flip backward, the first sliding member slides upward along the front support frame, the second sliding member slides forward along the bottom support frame, and the rear support frame slides upward along the support frame, so that the front support frame, the bottom support frame, the rear support frame, the support frame, the rear support frame, the side rod frame, and the push rod frame are folded together in the front-to-back direction.

2. The stroller according to claim 1, characterized in that: The support frame and the rear support extend parallel to each other or along the same length direction. The support frame and the rear support are slidably connected to each other along the length direction. During the process of the frame changing from an unfolded state to a folded state, the rear support slides upward along the support frame.

3. The stroller according to claim 1, characterized in that: With the frame folded, the rear wheel assembly is suspended in the air, and the lower part of the support frame and the lower part of the push rod frame are supported on the ground together.

4. The stroller according to claim 1, characterized in that: The frame also includes a seat frame that extends in the front-rear direction when unfolded. The rear of the seat frame is rotatably connected to the rear support frame. A third sliding member is rotatably provided on the side frame. The third sliding member is slidably provided on the seat frame along the length extension direction of the seat frame.

5. The stroller according to any one of claims 1 to 4, characterized in that: The front support includes two front support rods located on the left and right sides and extending vertically; the side support includes two side rods located on the left and right sides and extending vertically; the support frame includes two support rods located on the left and right sides; on each side of the frame, the upper part of the front support rod is rotatably connected to the lower part of the side rod around a first rotation center line, and the upper part of the support rod is rotatably connected to the lower part of the side rod around a second rotation center line, wherein the first rotation center line and the second rotation center line extend parallel to each other or collinearly.

6. The stroller according to claim 5, characterized in that: The lower part of the side rod has a first connector and a second connector, and the upper part of the front support rod is fixed with a third connector. When the frame is in the unfolded state, the first connector extends downward and forward from the lower part of the side rod, the second connector extends downward and backward from the lower part of the side rod, and the third connector extends downward and backward from the upper part of the front support rod. The first connector and the third connector are rotatably connected around the first rotation center line. The upper part of the support rod is rotatably connected to the second connector around the second rotation center line. The first rotation center line is located below the second rotation center line. The upper end of the front support rod and the lower end of the side rod abut against each other.

7. The stroller according to claim 5, characterized in that: The rear support includes two rear support rods located on the left and right sides, and each rear support rod on one side has a set of rear wheel assemblies at its bottom; the rear support rod on the same side extends parallel to or along the same length direction as the support rod, and the rear support rod and the support rod are slidably connected to each other along the length direction. The connecting frame includes two connecting rods disposed on the left and right sides. On each side of the frame, the first sliding member is slidably mounted on the front support rod. One end of the connecting rod is rotatably connected to the second sliding member around a fourth rotation center line, and the other end of the connecting rod is rotatably connected to the rear support rod around a fifth rotation center line.

8. The stroller according to claim 7, characterized in that: The rear support frame includes two rear support rods located on the left and right sides and extending vertically. The push rod frame includes two push rods located on the left and right sides and extending vertically. On each side of the frame, the upper part of the side rod is rotatably connected to the push rod around the sixth rotation center line. The rear support rod and the support rod intersect each other and are rotatably connected around the seventh rotation center line at the intersection. The upper part of the rear support rod and the lower part of the push rod are rotatably connected around the eighth rotation center line. The lower part of the rear support rod is rotatably connected to the second sliding member around the ninth rotation center line. The sixth rotation center line and the eighth rotation center line are parallel to each other, and the ninth rotation center line and the fourth rotation center line extend parallel to each other or collinearly.

9. The stroller according to claim 7, characterized in that: The rear support rod has a hollow rod cavity that extends through its own length. The rear support rod can be slidably fitted onto the support rod along its own length. The lower part of the support rod passes under the rear support rod and is rotatably connected to the rear part of the bottom support rod.

Images