Back chasing device for study chair

Abstract

The utility model relates to the field of chairs, and particularly discloses a back-chasing device for a learning chair, which comprises a fixing piece, a first connecting part, a second connecting part and a back-chasing device, and is characterized in that one end of the fixing piece is provided with a first connecting part for connecting a chair rod of a chair seat; one end of the adjusting part is provided with a second connecting part for mounting the backrest, and the adjusting part moves relative to the fixing part to change the horizontal distance between the first connecting part and the second connecting part; a friction plate is arranged on the fixing piece in the moving direction of the adjusting piece, a locking piece is arranged on the adjusting piece, and the locking piece is provided with a locking plate locked with the friction plate in a friction mode; a notch allowing the lock plate to penetrate through is formed in the adjusting piece, a shifting piece used for driving the lock plate to abut against the friction plate is arranged on the lock piece, and the shifting piece is rotationally arranged on the adjusting piece; and the lock plate has two states of abutting against the friction plate and completely separating from the friction plate when rotating along with the shifting piece. The method has the effect of rapid adjustment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of chairs, in particular to a backrest device for a learning chair. BACKGROUND

[0002] At present, in order to make the children's chair more comfortable, a backrest structure is generally arranged on the children's chair. The existing backrest structure, such as the Chinese patent with the publication number CN220832486U in the related art, mainly adopts the mode of pressing the seat plate to drive the backrest to realize the backrest, which has a specific backrest stroke and cannot well adapt to the situation of each person. CONTENT OF THE UTILITY MODEL

[0003] In order to realize the adjustment of the backrest position and adapt to the needs of different people, the present application provides a backrest device for a learning chair.

[0004] The backrest device for a learning chair provided by the present application adopts the following technical scheme:

[0005] Comprises:

[0006] A fixed part having a first connecting part for connecting a chair rod of a chair seat at one end;

[0007] An adjusting part having a second connecting part for mounting a backrest at one end, the adjusting part moving relative to the fixed part to change the horizontal distance between the first connecting part and the second connecting part;

[0008] The fixed part is provided with a friction plate in the moving direction of the adjusting part, the adjusting part is provided with a lock part, the lock part has a lock plate that rubs and locks with the friction plate; a slot is formed in the adjusting part for the lock plate to pass through, the lock part has a push piece for driving the lock plate to abut on the friction plate, the push piece is rotationally arranged on the adjusting part; the lock plate has two states of abutting on the friction plate and completely separating from the friction plate when the push piece rotates.

[0009] By adopting the above technical scheme, when the lock plate abuts on the friction plate, the fixed part and the adjusting part are axially locked, at this time, the adjusting part cannot move relative to the fixed part. When adjusting, the push piece is rotated to make the protruding part not abut on the lock plate, so that the lock plate completely separates from the friction plate, at this time, the lock plate is spaced apart from the outer wall of the rod body, so that the adjusting part can be moved.

[0010] In one possible implementation, the lock plate is provided with a lock plate for increasing the friction force with the friction plate, the lock part comprises an outer shell fixed to the outer wall of the adjusting part, an elastic part arranged between the outer shell and the lock plate, and a push piece rotationally connected to the outer shell through a pin shaft, one end of the push piece abutting on the lock plate.

[0011] In one possible implementation, the push piece is provided with a protruding part, the protruding part has two states of abutting on the lock plate and completely separating from the lock plate when the push piece rotates.

[0012] In one possible implementation, the locking plate includes a pressing portion, a first extension portion and a second extension portion disposed at both ends of the pressing portion, two elastic members respectively connected to the first extension portion and the second extension portion, and locking teeth located on the pressing portion.

[0013] In one possible implementation, the first extension and the second extension are two opposing "L"-shaped structures.

[0014] In one possible implementation, one end of the paddle is bent and extended away from the adjusting member.

[0015] In one possible implementation, the adjusting member has a receiving cavity, the fixing member has a rod that is inserted into the receiving cavity, the rod has a limiting groove, and the inner wall of the receiving cavity is provided with a limiting block that is embedded in the limiting groove.

[0016] In one possible implementation, the first connecting part is a connecting ring integrally formed with the rod body.

[0017] In one possible implementation, the adjusting member includes a sleeve and a connecting arm integrally formed on one end of the sleeve, with a second connecting portion integrally formed on the connecting arm.

[0018] In one possible implementation, the second connection portion includes a slot, which includes a first groove and a second groove, the first groove being larger than the second groove, and the second groove being located outside the first groove.

[0019] In summary, this application includes at least one of the following beneficial technical effects: the chasing mechanism can be quickly adjusted by rotating the locking member. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0021] Figure 2 This is a structural schematic diagram of a part of the embodiment, mainly showing the fastener;

[0022] Figure 3 This is a structural schematic diagram of a part of the embodiment, mainly showing the adjusting component;

[0023] Figure 4 This is a cross-sectional schematic diagram of an embodiment;

[0024] Figure 5 yes Figure 4 An enlarged schematic diagram of part A in the middle.

[0025] Reference numerals: 1. Fixing component; 2. Adjusting component; 3. First connecting part; 4. Second connecting part; 5. Receiving cavity; 6. Rod body; 7. Connecting ring; 8. Sleeve; 9. Connecting arm; 10. Limiting groove; 11. Limiting block; 12. First groove; 13. Second groove; 14. Friction plate; 15. Locking component; 16. Locking plate; 17. Groove; 18. Outer shell; 19. Locking tooth; 20. Elastic component; 21. Paddle; 22. Protrusion; 23. Extrusion part; 24. First extension; 25. Second extension. Detailed Implementation

[0026] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0027] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0028] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0029] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] Reference Figures 1-5 A backrest support device for a study chair includes a fixing member 1 and an adjusting member 2. One end of the fixing member 1 has a first connecting portion 3 for connecting the chair rod to the seat; one end of the adjusting member 2 has a second connecting portion 4 for mounting the backrest. The adjusting member 2 can move relative to the fixing member 1 to change the horizontal distance between the first connecting portion 3 and the second connecting portion 4.

[0031] Specifically, the adjusting member 2 has a receiving cavity 5, the fixing member 1 has a rod 6 inserted into the receiving cavity 5, and the first connecting part 3 is a connecting ring 7 integrally formed with the rod 6. The connecting ring 7 has a racetrack-shaped structure. During installation, the connecting ring 7 is fitted onto the seat rod and locked with a pin.

[0032] The adjusting component 2 includes a sleeve 8 and a connecting arm 9 integrally formed on one end of the sleeve 8. The second connecting part 4 is integrally formed on the connecting arm 9, and the receiving cavity 5 is located inside the sleeve 8. In order to prevent the sleeve 8 from rotating relative to the other side when it moves, a limiting groove 10 is provided on the rod body 6, and a limiting block 11 embedded in the limiting groove 10 is provided on the inner wall of the receiving cavity 5.

[0033] The second connecting part 4 includes a slot with openings at the top and on the side closest to the human body, and a closed bottom. The slot includes a first groove 12 and a second groove 13, where the first groove 12 is larger than the second groove 13, and the second groove 13 is located outside the first groove 12. During installation, the protruding structure on the backrest corresponding to the slot is inserted into the slot.

[0034] The rod body 6 is provided with a friction plate 14 along the moving direction of the sleeve 8. The sleeve 8 is provided with a locking member 15. The locking member 15 has a locking plate 16 that abuts and rubs against the friction plate 14. The sleeve 8 is provided with a slot 17 for the locking plate 16 to be inserted. When rotating with the locking member 15, the locking plate 16 has two states: abutting against the friction plate 14 and completely disengaging from the friction plate 14.

[0035] The locking component 15 also includes a housing 18, elastic elements 20, and a lever 21. The housing 18 is fixedly mounted on the outer wall of the sleeve 8. There are two elastic elements 20, symmetrically connected to the locking plate 16, with the other end of each elastic element 20 connected to the inner wall of the housing 18. The elastic element 20 is a spring. The lever 21 is rotatably connected to the housing 18 via a pin. The locking plate 16 is provided with locking teeth 19 for increasing friction with the friction plate 14. Specifically, the lever 21 has a protrusion 22, which has two states when the lever 21 rotates: abutting against the locking plate 16 and completely disengaging from the locking plate 16. When the locking plate 16 abuts against the friction plate 14, the fixing component 1 and the adjusting component 2 are axially locked. At this time, the adjusting component 2 cannot move relative to the fixing component 1. During adjustment, the lever 21 needs to be rotated so that the protrusion 22 does not abut against the locking plate 16, so that the locking plate 16 is completely separated from the friction plate 14. At this time, since the locking plate 16 is spaced apart from the outer wall of the rod 6, the adjusting member 2 can be moved.

[0036] The locking plate 16 includes a pressing portion 23, a first extension portion 24, and a second extension portion 25. The first extension portion 24 and the second extension portion 25 are respectively disposed on both ends of the pressing portion 23. The elastic element 20 is connected to the first extension portion 24 and the second extension portion 25 respectively, and the locking tooth 19 is located on the pressing portion 23. Specifically, the first extension portion 24 and the second extension portion 25 are two oppositely arranged "L" shaped structures.

[0037] One end of the lever 21 is bent and extended away from the adjusting element 2.

[0038] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0039] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0040] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A back follower for a learning chair, characterized by: The utility model relates to a backrest adjusting device of learning chair, which comprises: a fixed part (1) having a first connecting part (3) at one end for connecting a chair rod of a chair seat; an adjusting part (2) having a second connecting part (4) at one end for mounting a backrest, the adjusting part (2) being movable relative to the fixed part (1) to change the horizontal distance between the first connecting part (3) and the second connecting part (4); the fixed part (1) is provided with a friction plate (14) in the moving direction of the adjusting part (2), the adjusting part (2) is provided with a lock part (15), the lock part (15) has a lock plate (16) for friction locking with the friction plate (14), the adjusting part (2) is provided with a slot (17) for the lock plate (16) to pass through, the lock part (15) is provided with a push piece (21) for driving the lock plate (16) to abut against the friction plate (14), the push piece (21) is rotatably arranged on the adjusting part (2), and the lock plate (16) has two states of abutting against the friction plate (14) and completely separating from the friction plate (14) when the push piece (21) rotates.

2. The backrest adjusting device of learning chair according to claim 1, wherein: the lock plate (16) is provided with lock teeth (19) for increasing the friction with the friction plate (14), the lock part (15) comprises an outer shell (18) fixedly arranged on the outer wall of the adjusting part (2), an elastic part (20) arranged between the outer shell (18) and the lock plate (16), and the push piece (21) is rotatably connected to the outer shell (18) through a pin shaft, and one end of the push piece (21) abuts against the lock plate (16).

3. The backrest adjusting device of learning chair according to claim 2, wherein: the push piece (21) is provided with a protruding part (22), the protruding part (22) has two states of abutting against the lock plate (16) and completely separating from the lock plate (16) when the push piece (21) rotates.

4. The backrest adjusting device of learning chair according to claim 2, wherein: the lock plate (16) comprises a pressing part (23), a first extension part (24) and a second extension part (25) arranged at two ends of the pressing part (23), the elastic part (20) is two, and is connected with the first extension part (24) and the second extension part (25) respectively, and the lock teeth (19) are located on the pressing part (23).

5. The backrest adjusting device of learning chair according to claim 4, wherein: the first extension part (24) and the second extension part (25) are two oppositely arranged "L" type structures.

6. The backrest adjusting device of learning chair according to claim 1, wherein: one end of the push piece (21) is bent and extended away from the adjusting part (2).

7. The backrest adjusting device of learning chair according to claim 1, wherein: The adjusting piece (2) has a containing cavity (5), the fixing piece (1) has a rod body (6) inserted into the containing cavity (5), the rod body (6) is provided with a limiting slot (10), and the containing cavity (5) is provided with a limiting block (11) embedded into the limiting slot (10).

8. The backrest following device for learning chair according to claim 7, characterized in that: The first connecting part (3) is a connecting ring (7) integrally formed with the rod body (6).

9. The backrest following device for learning chair according to claim 1, characterized in that: The adjusting piece (2) comprises a sleeve (8) and a connecting arm (9) integrally formed on one end of the sleeve (8), and the second connecting part (4) is integrally formed on the connecting arm (9).

10. The backrest following device for learning chair according to claim 9, characterized in that: The second connecting part (4) comprises a slot, and the slot comprises a first slot body (12) and a second slot body (13); the size of the first slot body (12) is greater than the size of the second slot body (13), and the second slot body (13) is located outside the first slot body (12).

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