CN216776528U

CN216776528U - Seat back adjusting mechanism and seat

Info

Publication number: CN216776528U
Application number: CN202220295266.3U
Authority: CN
Inventors: 陈向林; 陶冉
Original assignee: Wuhu Aiguole Intelligent Technology Co ltd
Current assignee: Wuhu Aiguole Intelligent Technology Co ltd
Priority date: 2022-02-14
Filing date: 2022-02-14
Publication date: 2022-06-21
Anticipated expiration: 2032-02-14

Abstract

The utility model discloses a seat backrest adjusting mechanism and a seat; the seat backrest adjusting mechanism comprises a backrest fixing plate, a fixing sleeve, a connecting rod assembly and a locking mechanism; the connecting rod assembly is a two-connecting rod assembly or a four-connecting rod assembly; the two-connecting-rod assembly comprises two hinged connecting rods, and the four-connecting-rod assembly comprises four movably connected connecting rods; one end of the connecting rod component is hinged with the fixed sleeve, and the other end of the connecting rod component is hinged with the backrest fixing plate or connected with a moving part which can move along the backrest fixing plate; the hinged end of two connecting rods in the connecting rod component, which is hinged with the fixed sleeve, or the hinged end of two connecting rods in the connecting rod component, which is hinged with the backrest fixed plate, is provided with a meshing tooth part; the locking mechanism comprises a locking driving piece and a locking gear; the locking gear can be meshed and locked with the meshing tooth part of the connecting rod; the lock driving member can push the lock gear to disengage the lock gear from the meshing tooth portion of the link. The utility model can realize the maximum range adjustment of the seat depth, so that the seat can adapt to children with different body types and different age groups.

Description

Seat backrest adjusting mechanism and seat

Technical Field

The utility model relates to the technical field of learning chairs, in particular to a chair backrest adjusting mechanism and a chair.

Background

The learning chair is used as a tool for accompanying children to learn and plays an important role in the growth learning process of the children. The existing child learning seat basically meets the use requirements of children with different heights through a lifting function, but most of the chair backs of the learning seat are fixed and cannot be adjusted front and back, so that the seat depth cannot be adjusted. The children's position of sitting of different sizes and different age brackets is different, and the seat can't be adjusted then can't make the children of different sizes and different age brackets keep a healthy position of sitting, and the seat is adjusted not to suitable scope deeply moreover, also makes learning chair its back can not laminating children back when children use, makes children back lack the support, and the problem of bow-backed appears after children sit for a long time easily, and then influences children's study and healthy growth. Therefore, it is desirable to provide a chair back adjustment mechanism for a chair for learning to achieve maximum range of adjustment of the seat depth.

SUMMERY OF THE UTILITY MODEL

In order to solve the above technical problems, the present invention provides a seat back adjustment mechanism and a seat; this seat back adjustment mechanism can carry out fore-and-aft regulation to the seat back to the realization is adjusted the deep maximum range of seat, makes the seat can adapt to the children of different sizes and different age brackets, keeps the seat back can laminate children back in order to form the support.

In order to achieve the technical purpose and achieve the technical effect, the utility model is realized by the following technical scheme:

a chair backrest adjusting mechanism comprises a backrest fixing plate, a fixing sleeve, a connecting rod assembly and a locking mechanism; the seat backrest is arranged on the backrest fixing plate; the connecting rod assembly is a two-connecting rod assembly which is unfolded in a V shape or a four-connecting rod assembly which is in a quadrilateral structure; the two connecting rod assemblies comprise two connecting rods which are hinged with each other, and the four connecting rod assemblies comprise four connecting rods which are movably connected end to end; one end of the connecting rod component is hinged with the fixed sleeve, and the other end of the connecting rod component, which is opposite to the fixed backrest plate, is hinged with the movable piece which can move along the fixed backrest plate; the hinged ends of two connecting rods in the connecting rod assembly, which are hinged with the fixed sleeve, or the hinged ends of two connecting rods in the connecting rod assembly, which are hinged with the backrest fixed plate, are respectively provided with a meshing tooth part; the locking mechanism comprises a locking driving piece and a locking gear; the locking gear can be meshed and locked with the meshing tooth part of the connecting rod; the locking driving piece can push the locking gear to enable the locking gear to be separated from the meshing tooth part of the connecting rod.

As a preferred technical scheme of the utility model, in the two-link assembly, the rear ends of the two links are respectively hinged with the fixed sleeve, the front ends of the two links are respectively connected with the corresponding moving parts, and the two moving parts can do relative approaching movement or relative departing movement along the backrest fixing plate; the meshing tooth parts at the rear ends of the two connecting rods are meshed with each other.

As another preferable technical solution of the present invention, in the four-bar linkage assembly, two links located on the left side and two links located on the right side are hinged to each other; in the two connecting rods hinged with each other at each side, the front end of one connecting rod is hinged with the backrest fixing plate, and the rear end of the other connecting rod is hinged with the fixing sleeve.

Furthermore, in the four-bar linkage assembly, the outer end parts of the two mutually hinged connecting rods on each side are respectively provided with meshing teeth parts, and the meshing teeth parts of the two connecting rods hinged with the backrest fixing plate and the meshing teeth parts of the two connecting rods hinged with the fixing sleeve are meshed with each other.

Further, for a four bar linkage assembly, the locking mechanism is located on the back plate.

As a further improvement of the above technical solution of the present invention, the locking driving member is a cam wrench, the cam wrench has an operating portion and a cam portion, and the cam portion is hinged to the backrest fixing plate or the fixing sleeve; the cam portion of the cam wrench can push the locking gear.

As a further improvement of the above technical solution of the present invention, a transition block is provided between the lock gear and the cam wrench, and the cam wrench acts on the lock gear through the transition block.

As a further improvement of the above technical solution of the present invention, an elastic member is disposed between the locking gear and the backrest fixing rod or between the locking gear and the fixing sleeve, so that the locking gear ascends under the action of elastic force and is engaged and locked with the engaging tooth portion of the connecting rod.

As a further improvement of the technical scheme of the utility model, a torsion spring is arranged at one end of the connecting rod component, which is hinged with the fixed sleeve; under the action of the torsion spring, a connecting rod in the connecting rod assembly elastically swings.

The utility model also provides a seat which comprises the seat backrest adjusting mechanism, wherein the fixing sleeve is connected to the backrest supporting column of the seat.

The utility model has the beneficial effects that:

the seat back adjusting mechanism drives the seat back to move back and forth through the swinging of the connecting rod in the connecting rod assembly, so that the front and back adjustment of the maximum stroke of the seat back is realized, the maximum range adjustment of the seat depth is further realized, the seat can adapt to children with different body types and different age groups, the seat back can be attached to the back of the child to form support, and the problem that the child bends over and humps after sitting for a long time is solved.

The locking mechanism can realize the locking and unlocking operation of the connecting rod movement of the seat backrest adjusting mechanism; specifically, the locking driving piece is operated to push the locking gear, the locking gear is separated from the meshing tooth part of the connecting rod, the connecting rod assembly is unlocked, and moves, so that the seat backrest is adjusted forwards and backwards; when the seat back is adjusted to a proper position, the locking driving piece is operated again, the locking driving piece does not press the locking gear any more, the locking gear is meshed with the meshing tooth parts of the two connecting rods which swing relatively after rising, the connecting rod assembly is locked, and then the seat back is locked.

The locking mechanism has the advantages of ingenious structural design, realization of locking and unlocking operation of the movement of the connecting rod, good structural stability and reliability and convenient operation.

Drawings

Fig. 1 is an exploded view of a seat back adjustment mechanism according to an embodiment of the present invention.

Fig. 2 is a schematic view of a combination structure of a seat back adjusting mechanism according to an embodiment of the present invention.

Fig. 3 is a partial structural plan view of a seat back adjustment mechanism according to an embodiment of the present invention.

Fig. 4 is a cross-sectional view taken along line a-a of fig. 3.

Fig. 5 is a seat incorporating a seat back adjustment mechanism according to an embodiment of the present invention.

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the utility model easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the utility model.

In the description of the present invention, it is to be understood that the terms "front", "rear", "left", "right", "upper", "lower", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

A preferred embodiment of a seat back adjustment mechanism as shown in figures 1 to 4; the seat backrest adjusting mechanism comprises a backrest fixing plate 1, a fixing sleeve 2, a connecting rod component 3 and a locking mechanism 4; the seat backrest 7 is arranged on the backrest fixing plate 1; in this embodiment, the connecting rod assembly 3 is a four-connecting rod assembly having a parallelogram structure; the four-connecting-rod assembly comprises four connecting rods 31 which are movably connected end to end; one end of the connecting rod component is hinged with the fixed sleeve 2, and the other end of the connecting rod component opposite to the fixed backrest plate 1 is hinged with the fixed backrest plate; the hinged ends of two connecting rods 31 in the connecting rod assembly, which are hinged with the backrest fixing plate 1, are respectively provided with an engaging tooth part 311; the lock mechanism 4 includes a lock driver 41 and a lock gear 42; the lock gear 42 can be locked in mesh with the meshing tooth portion 311 of the link 31; the lock driving member 41 can push the lock gear 42 to disengage the lock gear 42 from the engagement tooth portion 311 of the link 31.

Specifically, in the four-bar linkage assembly, two links positioned on the left side and two links positioned on the right side are hinged with each other; of the two connecting rods hinged with each other at each side, the front end of one connecting rod 31 is hinged with the backrest fixing plate 1 through a step bolt 8, and the rear end of the other connecting rod 31 is hinged with the fixing sleeve 2 through the step bolt 8. The step bolt connected with the fixed sleeve 2 is provided with a torsion spring 5, and the connecting rod assembly 3 elastically swings under the action of the torsion spring 5.

In the four-bar linkage assembly, the outer ends of the two links 31 hinged to each other on each side (the hinged end of one link hinged to the backrest fixing plate and the hinged end of the other link hinged to the fixing sleeve) have meshing teeth 311, and the meshing teeth 311 of the two links 31 hinged to the backrest fixing plate 1 (the two links on the front side) and the meshing teeth 311 of the two links 31 hinged to the fixing sleeve 2 (the two links on the rear side) mesh with each other to achieve synchronous linkage of the four links 31. More specifically, in the present embodiment, the number of the meshing teeth 311 of each link 31 is two, and the two meshing teeth 311 are disposed up and down. The backrest fixing plate 1 and the fixing sleeve 2 are respectively provided with a U-shaped structure; the two meshing teeth 311 of the connecting rod are positioned in the corresponding U-shaped structures; the step bolt 8 passes through the two meshing teeth 311 and is connected with the corresponding U-shaped structure.

In this embodiment, the locking mechanism 4 is located on the backrest fixing plate 1. The locking drive 41 in the locking mechanism 4 is a cam wrench; the cam wrench has an operating portion 411 and a cam portion 412, and the cam portion 412 is hinged to the top of the backrest fixing plate 1. The number of the locking gears 42 is two corresponding to two engaging tooth portions 311 provided up and down of the link 31, and the two locking gears 42 are connected up and down by the connecting shaft 43. The upper end of the connecting shaft 43 is also connected with a transition block 44; the top of the U-shaped structure of the backrest fixing plate 1 is provided with a mounting groove 11, and a transition block 44 is embedded into the mounting groove; the lower end of the connecting shaft 43 passes through the bottom cover 12 arranged on the bottom of the backrest fixing plate; an elastic member 6 is disposed between the lower locking gear 42 and the bottom cover 12, and in this embodiment, the elastic member 6 is a spring. The cam portion 412 of the cam wrench is located above the transition block 44; when the operating part 411 of the cam wrench is lifted, the cam part 412 of the cam wrench can push the transition block 44, and the transition block 44 pushes the locking gear 42, so that the locking gear 42 descends to be separated from the meshing tooth part 311 of the connecting rod 31, the four-bar connecting rod assembly is unlocked, and the seat back 7 can move back and forth. When the operating portion 411 of the cam wrench is pressed down, the cam portion 412 of the cam wrench no longer presses the transition block 44, and the locking gear 42 is lifted up by the elastic force of the spring and engaged and locked with the engagement tooth portions 311 of the two links 31 that swing relative to each other to lock the four-link assembly, and the seat back 7 is locked.

When the locking mechanism is used, the operating part 411 of the cam wrench is lifted, the cam wrench rotates around the hinge point, the cam part 412 of the cam wrench pushes the transition block 44, the transition block 44 pushes the locking gear 42, so that the locking gear 42 descends to be separated from the meshing tooth parts 311 of the two connecting rods 31, and the four-connecting-rod assembly is unlocked; the user can exert force through the back to move the seat back 7 back and forth under the synchronous linkage of the connecting rod assembly 3. When the seat back 7 is adjusted to a proper position, the operating part 411 of the cam wrench is pressed down, the cam part 412 of the cam wrench does not press against the transition block 44 any more, the locking gear 42 rises under the action of the elastic force of the spring, and is simultaneously engaged and locked with the engaging tooth parts 311 of the two relatively swinging connecting rods 31, and the four-connecting-rod assembly is locked, so that the seat back 7 is locked, and the seat depth is adjusted. After the seat depth is adjusted, the seat backrest 7 is well attached to the back of the child, and the back of the child is well supported.

A seat as shown in fig. 5 includes the seat back adjusting mechanism of this embodiment, in which the cover 2 is attached to the back attachment post 9 at the rear side of the seat.

Fig. 1 to 4 show a preferred embodiment. For the four-bar linkage assembly, in other embodiments, the locking mechanism 4 may also be disposed on the fixing sleeve 2 through a structural design to lock the two links 31 hinged to the fixing sleeve through the locking gear 42. In addition, in other embodiments, the connecting rod assembly can also be a two-connecting-rod assembly; in the two-connecting-rod assembly, the rear ends of the two connecting rods are respectively hinged with the fixed sleeve, and the two connecting rods are unfolded in a V shape; the front ends of the two connecting rods are respectively connected with moving parts, and the two moving parts can move relatively close to or move relatively away from each other along the backrest fixing plate; the rear ends of the two connecting rods are provided with meshing tooth parts, and the meshing tooth parts of the two connecting rods are meshed with each other. The moving part can be designed into a sliding block structure which can slide along the backrest fixing plate, and the relative approaching movement or the relative departing movement of the two connecting rods is realized through sliding; the moving piece can be designed into a gear structure, and the gear structure is matched with a rack on the backrest fixing plate to move, so that the relative approaching movement or the relative departing movement of the two connecting rods is realized. For the two-link assembly, the locking mechanism is arranged on the fixed sleeve to lock the two links hinged with the fixed sleeve through the locking gear.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A chair backrest adjusting mechanism is characterized by comprising a backrest fixing plate, a fixing sleeve, a connecting rod assembly and a locking mechanism; the seat backrest is arranged on the backrest fixing plate; the connecting rod assembly is a two-connecting rod assembly which is unfolded in a V shape or a four-connecting rod assembly which is in a quadrilateral structure; the two connecting rod assemblies comprise two connecting rods which are hinged with each other, and the four connecting rod assemblies comprise four connecting rods which are movably connected end to end; one end of the connecting rod component is hinged with the fixed sleeve, and the other end of the connecting rod component, which is opposite to the fixed sleeve, is hinged with the backrest fixed plate or connected with a moving part which can move along the backrest fixed plate; the hinged ends of two connecting rods in the connecting rod assembly, which are hinged with the fixed sleeve, or the hinged ends of two connecting rods in the connecting rod assembly, which are hinged with the backrest fixed plate, are respectively provided with a meshing tooth part; the locking mechanism comprises a locking driving piece and a locking gear; the locking gear can be meshed and locked with the meshing tooth part of the connecting rod; the locking driving piece can push the locking gear to enable the locking gear to be separated from the meshing tooth part of the connecting rod.

2. A seat back adjustment mechanism according to claim 1, wherein: in the two-link assembly, the rear ends of the two links are respectively hinged with the fixed sleeve, the front ends of the two links are respectively connected with corresponding moving parts, and the two moving parts can do relative approaching movement or relative deviating movement along the backrest fixing plate; the meshing tooth parts at the rear ends of the two connecting rods are meshed with each other.

3. A seat back adjustment mechanism according to claim 1, wherein: in the four-bar linkage assembly, two connecting rods positioned on the left side and two connecting rods positioned on the right side are hinged with each other, in the two connecting rods hinged with each other on each side, the front end of one connecting rod is hinged with the backrest fixing plate, and the rear end of the other connecting rod is hinged with the fixing sleeve.

4. A seat back adjustment mechanism according to claim 3, wherein: the outer ends of the two connecting rods hinged with each other on each side are respectively provided with an engaging tooth part; the meshing tooth parts of the two connecting rods hinged with the backrest fixing plate and the meshing tooth parts of the two connecting rods hinged with the fixing sleeve are meshed with each other.

5. A seat back adjustment mechanism according to claim 4, wherein: the locking mechanism is positioned on the backrest fixing plate.

6. A seat back adjustment mechanism according to claim 1, wherein: the locking driving piece is a cam wrench, the cam wrench is provided with an operating part and a cam part, and the cam part is hinged with the backrest fixing plate or the fixing sleeve; the cam portion of the cam wrench can push the locking gear.

7. A seat back adjustment mechanism according to claim 6, wherein: a transition block is arranged between the locking gear and the cam wrench, and the cam wrench acts on the locking gear through the transition block.

8. A seat back adjustment mechanism according to claim 1, wherein: an elastic part is arranged between the locking gear and the backrest fixing plate or between the locking gear and the fixing sleeve.

9. A seat back adjustment mechanism according to claim 1, wherein: and a torsional spring is arranged at one end of the connecting rod component, which is hinged with the fixed sleeve.

10. A seat, characterized by: a seat back adjustment mechanism comprising a seat back as claimed in any one of claims 1 to 9, wherein the harness is attached to a back support post of the seat.