Angle adjusting structure of baby rocking chair

Abstract

The invention discloses an angle adjusting structure of a baby rocking chair, which comprises a base which is obliquely arranged upwards from back to front, and hinge rods are respectively arranged on the left side and the right side of the front end of the base; the supporting frame is obliquely arranged upwards from front to back, matching rods are arranged on the left side and the right side of the rear end of the supporting frame respectively, and the matching rods and the hinge rods are hinged together; an assembling plate is arranged on the base, a fixing plate is arranged on the supporting frame, the rear end of the adjusting assembly is connected with the assembling plate, the front end of the adjusting assembly is connected with the fixing plate, and the inclination angle of the supporting frame is adjusted through the action of the adjusting assembly. The rocking chair is simple in structure, the inclination angle of the rocking chair can be effectively adjusted, and meanwhile the rocking chair can be stably supported.

Description

Technical Field

[0001] The invention relates to the technical field of rocking chairs, and in particular to an angle adjustment structure of a baby rocking chair. Background Art

[0002] When the baby is born, the stimulation signal of shaking in the mother's body suddenly disappears, which will make the baby feel uneasy and need to be shaken again. Rocking the baby in a baby rocking chair can make the baby feel satisfied, reduce the baby's crying, and is conducive to the healthy growth of the baby. In addition, the baby rocking chair can reduce the burden of parents and free their hands. When parents are working or busy with housework, they can put the baby in the rocking chair, which is safe and convenient for parents to do other things.

[0003] After the existing baby rocking chairs are assembled, the tilt angle of the rocking chair is fixed, and the tilt angle cannot be adjusted, so that the sitting and lying angles of the rocking chair cannot be changed. At the same time, the rocking structures of most rocking chairs have problems such as unstable support and severe vibration. Therefore, they cannot adapt to different needs and have limitations in use. Summary of the invention

[0004] The present invention aims to solve at least one of the problems existing in the existing related technologies to a certain extent. To this end, the present invention proposes an angle adjustment structure for a baby rocking chair, which has a simple structure and can effectively adjust the inclination angle of the rocking chair while also enabling the rocking chair to achieve stable support.

[0005] According to the above-mentioned angle adjustment structure of a baby rocking chair, it is realized by the following technical solutions:

[0006] An angle adjustment structure of a baby rocking chair, comprising:

[0007] A base is arranged from back to front and tilted upward, and hinge rods are respectively arranged on the left and right sides of the front end of the base;

[0008] A support frame is arranged to be tilted upward from front to back, and matching rods are respectively arranged on the left and right sides of the rear end of the support frame, and the matching rods are hingedly connected with the hinge rod;

[0009] An adjusting component is provided with an assembly plate on the base, and a fixing plate is provided on the supporting frame. The rear end of the adjusting component is connected to the assembly plate, and the front end is connected to the fixing plate. The inclination angle of the supporting frame is adjusted through the action of the adjusting component.

[0010] In some embodiments, the adjustment component includes:

[0011] A fixed tube, one end of which is hinged to the fixed plate;

[0012] A connecting pipe, one end of which is connected to the assembly plate, and the other end of which is movably sleeved in the fixed pipe;

[0013] An unlocking mechanism, wherein a plurality of positioning holes are provided on the fixing tube at intervals along the front-rear direction, and the unlocking mechanism is movably arranged on the connecting tube;

[0014] An adjusting mechanism, wherein one end of the adjusting mechanism is connected with the unlocking mechanism so that the unlocking mechanism unlocks or locks the displacement of the adjusting mechanism, and the other end is connected with the positioning hole so that the connecting pipe and the fixing pipe maintain a connection relationship.

[0015] In some embodiments, the adjustment mechanism includes a handle, a connecting rope and an adjusting rod, wherein the handle can be movably mounted on an external position of the connecting tube, the adjusting rod can be movably arranged in the connecting tube, and a slide plate and a positioning rod can be movably arranged in the adjusting rod, respectively. One end of the connecting rope is connected to the handle, and the other end is connected to the slide plate. The positioning rod is driven by the movement of the slide plate to establish or disconnect the connection relationship with the positioning hole, thereby locking or unlocking the connecting tube and the fixed tube.

[0016] In some embodiments, a first spring is further included, one end of which abuts against the positioning rod, and the other end of which passes through the through hole and abuts against the inner wall of the fixing tube;

[0017] A second spring, the second spring is connected to the slide plate at one end away from the connecting rope, a convex column is provided at the middle position of the adjusting rod in the direction from the connecting tube to the fixed tube, and the second spring abuts against the convex column at one end away from the slide plate.

[0018] In some embodiments, a limiting rod is further included, wherein the limiting rod is disposed in the fixing tube, and the limiting rod is cooperatively connected with the adjusting rod at an end away from the connecting rope to limit the displacement of the adjusting rod.

[0019] In some embodiments, a driving block is further included, and slide grooves are respectively opened on the two opposite side walls of the connecting tube. The driving block can be movably arranged in the connecting tube, and the two sides of one end of the driving block are respectively connected to the inner wall of the handle through the slide grooves, and the other end of the driving block is connected to the slide plate through the connecting rope.

[0020] In some embodiments, openings and through holes are respectively provided on two opposite side walls of the adjusting rod, the positioning rod can be movably arranged at the opening position, and the positioning rod is provided with a boss at the end away from the opening, and a recessed platform matching the boss is provided at the middle position of the slide plate, the recessed platform is obliquely provided with a pushing portion at the end away from the connecting rope, and a matching portion is correspondingly provided on the boss, the pushing portion is cooperatively connected with the matching portion so that the slide plate drives the positioning rod to perform telescopic movement at the opening position.

[0021] In some embodiments, the unlocking mechanism includes an unlocking rod, a mounting seat is provided on the assembly plate, the connecting tube is connected to the assembly plate via the mounting seat, an opening is provided on the mounting seat, an unlocking key is protrudingly provided at the upper end position of the unlocking rod, the unlocking key is movably arranged at the opening position, the unlocking rod is protrudingly provided with an unlocking portion at an end away from the unlocking key, an opening is provided on the connecting tube, the handle is recessed with a limiting groove at an end close to the assembly plate, the unlocking portion is movably arranged at the opening position, and the unlocking portion passes through the opening and is matched with the limiting groove to limit the movement of the handle.

[0022] In some embodiments, a third spring is further included, one end of the third spring abuts against the lower end of the unlocking key, and the other end of the third spring abuts against the bottom wall of the mounting seat.

[0023] In some embodiments, it further includes a spring sheet and a seat frame, wherein one end of the spring sheet is connected to the support frame, and the other end is connected to the lower end of the seat frame so that the seat frame can swing back and forth in the vertical direction.

[0024] Compared with the prior art, the present invention has at least the following beneficial effects:

[0025] 1. The angle adjustment structure of the baby rocking chair of the present invention has a simple structure and can effectively adjust the inclination angle of the rocking chair while also enabling the rocking chair to achieve stable support. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 is a first structural schematic diagram of a baby rocking chair in an embodiment of the present invention;

[0028] Figure 2 is a second structural schematic diagram of a baby rocking chair according to an embodiment of the present invention;

[0029] Figure 3 is a schematic diagram of the structure of the adjustment component in an embodiment of the present invention;

[0030] Figure 4 is an exploded schematic diagram of an adjustment component in an embodiment of the present invention;

[0031] Figure 5 is a structural schematic diagram of a partial structure of an adjustment component in an embodiment of the present invention;

[0032] Figure 6 Schematic diagram of the structure of the handle in the embodiment of the present invention. DETAILED DESCRIPTION

[0033] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in combination with the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, but not all of the embodiments. The components of the embodiment of the present invention can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of the technical solution claimed for protection of the present invention.

[0035] Example:

[0036] like Figures 1 to 6 As shown, this embodiment provides an angle adjustment structure of a baby rocking chair, comprising:

[0037] A base 1 is arranged to be tilted upward from the back to the front, and hinge rods 11 are respectively arranged on the left and right sides of the front end of the base 1;

[0038] The support frame 2 is arranged to be tilted upward from the front to the back, and a matching rod 21 is respectively arranged on the left and right sides of the rear end of the support frame 2, and the matching rod 21 is hingedly connected with the hinge rod 11;

[0039] The adjusting component 3 has an assembly plate 12 on the base 1 and a fixing plate 22 on the support frame 2. The rear end of the adjusting component 3 is connected to the assembly plate 12, and the front end is connected to the fixing plate 22. The inclination angle of the support frame 2 is adjusted by the action of the adjusting component 3.

[0040] In this embodiment, since the base 1 is arranged from back to front and tilted upward, and the support frame 2 is arranged from front to back and tilted upward, the base 1 is respectively hingedly provided with a hinge rod 11 on the left and right sides close to one end of the support frame 2, and the support frame 2 is respectively hingedly provided with a matching rod 21 on the left and right sides close to one end of the base 1, and the matching rod 21 is hingedly connected to the end of the hinge rod 11 away from the base 1 at one end away from the support frame 2, so that the rocking chair can be stably supported. In addition, since the base 1 and the support frame 2 They are all U-shaped structures, so that an assembly plate 12 is provided on the base 1, that is, the assembly plate 12 is respectively connected to the left and right sides of the base 1, and a fixing plate 22 is provided on the support frame 2, that is, the fixing plate 22 is respectively connected to the left and right sides of the support frame 2. The rear end of the adjustment component 3 is connected to the assembly plate 12, and the front end thereof is connected to the fixing plate 22. The inclination angle of the support frame 2 is adjusted by the action of the adjustment component 3. The structure is simple, the inclination angle of the rocking chair can be effectively adjusted, and the rocking chair can also be stably supported.

[0041] Furthermore, the adjustment component 3 includes:

[0042] A fixed pipe 4, one end of which is hinged to the fixed plate 22;

[0043] A connecting pipe 5, one end of which is connected to the mounting plate 12, and the other end of which is movably sleeved in the fixed pipe 4;

[0044] The unlocking mechanism 6 is provided with a plurality of positioning holes 41 spaced apart in the front-rear direction on the fixing tube 4, and the unlocking mechanism 6 is movably arranged on the connecting tube 5;

[0045] The adjusting mechanism 7 has one end matched with the unlocking mechanism 6 so that the unlocking mechanism 6 can unlock or lock the displacement of the adjusting mechanism 7, and the other end matched with the positioning hole 41 so that the connecting pipe 5 and the fixing pipe 4 can maintain the connection relationship.

[0046] Preferably, the adjustment mechanism 7 includes a handle 71, a connecting rope 72, an adjusting rod 73, a positioning rod 74, a first spring 76 and a second spring 77, wherein the handle 71 can be movably sleeved at an external position of the connecting tube 5, the adjusting rod 73 can be movably arranged in the connecting tube 5, and a slide plate 75 and a positioning rod 74 can be movably arranged in the adjusting rod 73, respectively. One end of the connecting rope 72 is connected to the handle 71, and the other end is connected to the slide plate 75. The movement of the slide plate 75 drives the positioning rod 74 to establish or disconnect a connection relationship with the positioning hole 41, thereby locking or unlocking the connecting tube 5 and the fixing tube 4.

[0047] Specifically, it also includes a first spring 76, one end of which abuts against the positioning rod 74, and the other end of which passes through the through hole and abuts against the inner wall of the fixing tube 4;

[0048] The second spring 77 is connected to the slide plate 75 at one end away from the connecting rope 72. A convex column is provided at the middle position of the adjusting rod 73 in the direction from the connecting tube 5 to the fixed tube 4. The second spring 77 abuts against the convex column at one end away from the slide plate 75.

[0049] Preferably, a limiting rod 78 is further included. The limiting rod 78 is disposed in the fixing tube 4 . The limiting rod 78 is cooperatively connected with the adjusting rod 73 at one end away from the connecting rope 72 to limit the displacement of the adjusting rod 73 .

[0050] Furthermore, it also includes a driving block 79, on which slide grooves are respectively opened on the opposite side walls of the connecting tube 5. The driving block 79 can be movably arranged in the connecting tube 5, and the two sides of one end of the driving block 79 are respectively connected to the inner wall of the handle 71 through the slide groove, and the other end of the driving block 79 is connected to the slide plate 75 through the connecting rope 72.

[0051] Specifically, openings and through holes are respectively provided on the two opposite side walls of the adjustment rod 73, the positioning rod 74 is movably arranged at the opening position, and the positioning rod 74 is provided with a boss 741 at the end away from the opening, and a recessed platform 751 matching with the boss 741 is recessed at the middle position of the slide plate 75, and the recessed platform 751 is obliquely provided with a pushing portion at the end away from the connecting rope 72, and a matching portion is correspondingly provided on the boss 741. The pushing portion and the matching portion are matched and connected so that the slide plate 75 drives the positioning rod 74 to perform telescopic movement at the opening position.

[0052] Preferably, the unlocking mechanism 6 includes an unlocking rod 61, a mounting seat 13 is provided on the assembly plate 12, the connecting tube 5 is connected to the assembly plate 12 through the mounting seat 13, an opening is opened on the mounting seat 13, an unlocking key 62 is protrudingly provided at the upper end position of the unlocking rod 61, the unlocking key 62 is movably arranged at the opening position, the unlocking rod 61 is protrudingly provided with an unlocking portion 63 at the end away from the unlocking key 62, an opening is opened on the connecting tube 5, the handle 71 is recessed with a limiting groove 72 at the end close to the assembly plate 12, the unlocking portion 63 is movably arranged at the opening position, and the unlocking portion 63 passes through the opening and is matched with the limiting groove 72 to limit the movement of the handle 71.

[0053] Furthermore, a third spring 64 is included, one end of the third spring 64 abuts against the lower end of the unlocking key 62 , and the other end of the third spring 64 abuts against the bottom wall of the mounting seat 13 .

[0054] In this embodiment, a mounting seat 13 is provided on the assembly plate 12, one end of the connecting tube 5 is connected to the assembly plate 12 through the mounting seat 13, and the other end can be movably mounted in the fixed tube 4, the fixed tube 4 is hinged to the fixed plate 22 at the end away from the connecting tube 5, and a plurality of positioning holes 41 are spaced apart along the front-to-back direction on the fixed tube 4, so that the plurality of positioning holes 41 form a plurality of gears, the handle 71 can be movably mounted at the external position of the connecting tube 5, and sliding grooves are respectively provided on the opposite side walls of the connecting tube 5, the driving block 79 can be movably arranged in the connecting tube 5, and the two sides of one end of the driving block 79 are respectively connected to the inner wall of the handle 71 through the sliding grooves, the connecting rope 72 is connected to the driving block 79 at the end away from the handle 71, and preferably, the connecting rope 72 is made of steel wire rope.

[0055] In addition, the adjustment rod 73 is movably arranged in the connecting tube 5, and a limiting rod 78 is fixedly installed in the connecting tube 5. The limiting rod 78 is connected with the adjustment rod 73 at the end away from the connecting rope 72 to limit the displacement of the adjustment rod 73, so as to limit the angle adjustment of the seat frame 9, thereby effectively improving the reliability of the angle adjustment of the seat frame 9. A sliding groove is defined in the adjustment rod 73, and a slide plate 75 is movably arranged on the sliding groove. The connecting rope 72 is connected to the slide plate 75 at the end away from the driving block 79. An opening and a through hole are respectively provided on the opposite sides of the adjustment rod 73. One end of the positioning rod 74 is suitable for passing through the opening and then being connected with the positioning hole 41. The positioning rod 74 is provided with a boss 741 protruding downward at the end away from the opening. A concave platform 751 matching with the boss 741 is concavely provided at the middle position of the slide plate 75. The concave platform 751 is provided with a pushing portion obliquely at the end away from the connecting rope 72. A corresponding through hole is provided on the boss 741. A matching portion is provided, and the pushing portion is matched and connected with the matching portion so that the slide plate 75 drives the positioning rod 74 to perform telescopic movement at the opening position, so that the slide plate 75 drives the positioning rod 74 to establish or disconnect the connection relationship with the positioning hole 41. One end of the first spring 76 abuts on the positioning rod 74, and the other end passes through the through hole and abuts on the inner wall of the fixed tube 4. The slide plate 75 is connected to the second spring 77 at the end away from the connecting rope 72. A convex column is provided at the middle position of the adjusting rod 73 in the direction from the connecting tube 5 to the fixed tube 4, and the second spring 77 abuts on the convex column at the end away from the slide plate 75.

[0056] In this embodiment, an opening is provided at the upper end of the mounting seat 13, and an unlocking key 62 is protrudingly provided at the upper end of the unlocking rod 61. The upper end of the unlocking key 62 is movably arranged at the opening position. One end of the third spring 64 abuts against the lower end of the unlocking key 62, and the other end abuts against the bottom wall of the mounting seat 13. The unlocking rod 61 is provided with an unlocking portion 63 at the end away from the unlocking key 62, and an opening is provided on the connecting tube 5. The handle 71 is provided with a limiting groove 72 at the end close to the assembly plate 12, and the unlocking portion 63 is suitable for passing through the opening and then cooperating with the limiting groove 72 to limit the movement of the handle 71.

[0057] When the locking cam 75 is in the unlocking state, the locking cam 71 is in the unlocking state, and the locking cam 71 is in the unlocking state, so that the locking cam 71 is unlocked and the locking cam 71 is in the unlocking state. The fitting connection between the tube 5 and the fixed tube 4 is unlocked, and then the connecting tube 5 is driven by external force to move from the support frame 2 to the base 1 or from the base 1 to the support frame 2 until the positioning rod 74 moves to the next positioning hole 41. The positioning rod 74 makes a reset movement under the elastic force of the first spring 76 to allow the positioning rod 74 to pass through the positioning hole 41, thereby establishing a connection relationship between the positioning rod 74 and the positioning hole 41, and at the same time locking the connecting tube 5 and the fixed tube 4 together. In addition, the unlocking key 62 makes a reset movement under the elastic force of the third spring 64 to allow the unlocking portion 63 to establish a connection relationship with the limiting groove 72, thereby locking the locking state of the handle 71.

[0058] In this embodiment, since the base 1 is arranged to be tilted from back to front and upward, and the support frame 2 is arranged to be tilted from front to back and upward, the lower end of the base 1 abuts against the ground, and the lower end of the support frame 2 abuts against the ground. Anti-slip pads 14 are respectively arranged at the lower end of the base 4 and on the left and right sides of the lower end of the support frame 5. A plurality of connecting sections are sequentially arranged on the anti-slip pad 14 along the front-to-back direction, and a circular arc transition connection is formed between two adjacent connecting sections. Therefore, no matter what gear position the inclination angle of the support frame 2 is in, the lower end of the base 1 and the lower end of the support frame 2 can fit well with the ground, thereby effectively improving the anti-slip performance of the anti-slip pad 14.

[0059] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. An angle adjustment structure for a baby rocking chair, characterized in that: include: A base (1) is arranged to be inclined from the back to the front and upward, and hinge rods (11) are respectively arranged on the left and right sides of the front end of the base (1); A support frame (2) is arranged to be tilted upward from front to back, and matching rods (21) are respectively arranged on the left and right sides of the rear end of the support frame (2), and the matching rods (21) are hingedly connected to the hinge rod (11); An adjusting component (3) is provided with an assembly plate (12) on the base (1), and a fixing plate (22) is provided on the support frame (2); the rear end of the adjusting component (3) is connected to the assembly plate (12), and the front end is connected to the fixing plate (22); the inclination angle of the support frame (2) is adjusted through the action of the adjusting component (3).

2. A baby rocking chair according to claim 1, characterized in that: The regulating component (3) comprises: A fixed tube (4), one end of which is hinged to the fixed plate (22); A connecting pipe (5), one end of which is connected to the assembly plate (12), and the other end of which is movably sleeved in the fixed pipe (4); An unlocking mechanism (6), wherein a plurality of positioning holes (41) are provided on the fixing tube (4) at intervals along the front-rear direction, and the unlocking mechanism (6) is movably arranged on the connecting tube (5); An adjusting mechanism (7), one end of the adjusting mechanism (7) is connected in cooperation with the unlocking mechanism (6) so that the unlocking mechanism (6) unlocks or locks the displacement of the adjusting mechanism (7), and the other end is connected in cooperation with the positioning hole (41) so that the connecting tube (5) and the fixing tube (4) maintain a connection relationship.

3. A baby rocking chair according to claim 2, characterized in that: The adjustment mechanism (7) comprises a handle (71), a connecting rope (72) and an adjusting rod (73), wherein the handle (71) is movably sleeved at an external position of the connecting tube (5), the adjusting rod (73) is movably arranged in the connecting tube (5), a slide plate (75) and a positioning rod (74) are movably arranged in the adjusting rod (73), one end of the connecting rope (72) is connected to the handle (71), and the other end is connected to the slide plate (75), and the positioning rod (74) is driven by the movement of the slide plate (75) to establish a connection relationship with or disconnect a connection relationship with the positioning hole (41), thereby locking or unlocking the connecting tube (5) and the fixing tube (4).

4. A baby rocking chair according to claim 3, characterized in that: It also includes a first spring (76), one end of which abuts against the positioning rod (74), and the other end of which passes through the through hole and abuts against the inner wall of the fixing tube (4); A second spring (77), the second spring (77) is connected to the slide plate (75) at one end away from the connecting rope (72), a convex column is provided at the middle position of the adjusting rod (73) in the direction from the connecting tube (5) to the fixing tube (4), and the second spring (77) abuts against the convex column at one end away from the slide plate (75).

5. The baby rocking chair according to claim 3, characterized in that: It also includes a limiting rod (78), which is arranged in the fixing tube (4), and the limiting rod (78) is cooperatively connected with the adjusting rod (73) at one end away from the connecting rope (72) to limit the displacement of the adjusting rod (73).

6. The baby rocking chair according to claim 3, characterized in that: It also includes a driving block (79), on which slide grooves are respectively provided on two opposite side walls of the connecting tube (5), the driving block (79) is movably arranged in the connecting tube (5), and the two sides of one end of the driving block (79) are respectively connected to the inner wall of the handle (71) through the slide grooves, and the other end of the driving block (79) is connected to the slide plate (75) through the connecting rope (72).

7. The baby rocking chair according to claim 3, characterized in that: An opening and a through hole are respectively provided on the two opposite side walls of the adjusting rod (73); the positioning rod (74) is movably arranged at the position of the opening; and the positioning rod (74) is provided with a boss (741) at one end away from the opening; a recess (751) matching with the boss (741) is provided at the middle position of the slide plate (75); a pushing portion is obliquely provided on the recess (751) at one end away from the connecting rope (72); a matching portion is correspondingly provided on the boss (741); the pushing portion is matched with the matching portion so that the slide plate (75) drives the positioning rod (74) to perform telescopic movement at the position of the opening.

8. The baby rocking chair according to claim 2, characterized in that: The unlocking mechanism (6) comprises an unlocking rod (61). A mounting seat (13) is provided on the assembly plate (12). The connecting tube (5) is connected to the assembly plate (12) via the mounting seat (13). An opening is provided on the mounting seat (13). An unlocking key (62) is provided at the upper end of the unlocking rod (61). The unlocking key (62) is movably provided at the opening. An unlocking portion (63) is provided at an end of the unlocking rod (61) away from the unlocking key (62). An opening is provided on the connecting tube (5). A limiting groove (72) is provided at an end of the handle (71) close to the assembly plate (12). The unlocking portion (63) is movably provided at the opening. After passing through the opening, the unlocking portion (63) is matched with the limiting groove (72) to limit the movement of the handle (71).

9. A baby rocking chair according to claim 8, characterized in that: It also includes a third spring (64), one end of which abuts against the lower end of the unlocking key (62) and the other end of which abuts against the bottom wall of the mounting seat (13).

10. A baby rocking chair according to any one of claims 1 to 9, characterized in that: It also comprises a spring sheet (8) and a seat frame (9), wherein one end of the spring sheet (8) is connected to the support frame (2), and the other end is connected to the lower end of the seat frame (9) so that the seat frame (9) can swing back and forth in the vertical direction.

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