CN201658054U - Elastic back - Google Patents

Abstract

The utility model discloses an elastic chair back, which comprises a back support and a backrest, wherein the backrest is pivoted on the back support, a connecting and limiting structure and an elastic component are also arranged between the back support and the backrest, one end of the connecting and limiting structure is fixedly connected with the back support, the other end of the connecting and limiting structure is blocked on the backrest, the overturning distance of the backrest far away from the direction of the back support is limited not to be excessive to overturn outwards, and meanwhile, an activity space is kept between the backrest and the back support; the elastic component is arranged in the movable space, one end of the elastic component is propped against the back support, and the other end of the elastic component is propped against the backrest. The elastic component is elastically supported on the back of the backrest to provide a buffering elasticity for the backrest to act on the back of a user, so that the inclination angle of the backrest can be automatically adjusted according to the backrest force of the user, and the use comfort of the user is improved. In addition, the elastic deformation performance of the elastic component is stable and reliable, the product structure is simple, and the production and the assembly are convenient.

Description

Elastic back

technical field

The utility model relates to the technology in the field of chair backs, in particular to an elastic chair back with simple structure and stable performance.

Background technique

At present, seats are widely used in various aspects of people's lives. According to different places of use, seats include office seats, car seats, conference seats, etc., too numerous to mention. The backrest is one of the important parts equipped on many current seats, and the backrest is used to provide the comfort of people's back leaning against. The backrest is preferably designed to be movable and adjustable, because it needs to be temporarily adjusted according to the differences in the personal physique and habits of different users, and, even for the same user, due to posture changes or the backrest falling down during use Angle changes also present a need to adjust the position and angle relative to the position of the user's back.

However, in the prior art, the backrests of most seats are fixed, so the comfort is relatively poor. Sitting on this chair for a long time, such as listening to reports, watching performances, etc., will make people feel uncomfortable. Although there are currently some chair backs with elastically adjustable inclination angles, the inclination adjustment structures of these chair backs are still too complicated, and the production cost is high. nature, which is not conducive to market competition.

Utility model content

The main purpose of the utility model is to provide an elastic chair back, which has a simple and novel structure, convenient assembly, easy manufacture, and stable and reliable working performance.

In order to achieve the above object, the utility model adopts the following technical solutions:

An elastic chair back, including a back support and a backrest, the backrest is pivotally connected to the back support, so that the backrest can be turned over relative to the back support; and, a connection limiting structure and a Elastic component, one end of the connection limit structure is fixedly connected to the back support, and the other end of the connection limit structure is blocked on the backrest, limiting the turning distance of the backrest away from the direction of the back support, and at the same time maintaining a movement between the backrest and the back support space; the elastic component is arranged in the activity space, one end of the elastic component pushes against the back support, and the other end of the elastic component pushes against the backrest.

As a preferred solution, the connection limiting structure includes a screw and a nut, the first end and the second end of the screw are respectively provided with external threads, and are screwed and fixed by the first end of the screw. On the back support, the second end of the screw rod passes through the back of the back and is screwed in connection with the nut, and the nut is blocked on the front side of the back.

As a preferred solution, the elastic member is an elastic piece, the elastic piece has a first elastic arm and a second elastic arm, the first elastic arm is pushed against the back support, and the second elastic arm is elastically pushed against the backrest; The first elastic arm is sleeved on the first end of the screw rod, the second elastic arm of the elastic piece is sleeved on the second end of the screw rod, and the second elastic arm is provided with a long hole through which the second end of the screw rod passes.

As a preferred solution, the elastic piece is U-shaped and includes an arc-shaped connecting portion, and the first elastic arm and the second elastic arm are formed integrally extending from two ends of the arc-shaped connecting portion.

As a preferred solution, the elastic component is a spring, the spring has a first elastic part and a second elastic part, the first elastic part pushes against the back support, and the second elastic part elastically pushes against the backrest; The first elastic part is sleeved on the first end of the screw rod, and the second elastic part of the spring is sleeved on the second end of the screw rod.

As a preferred solution, the spring is covered with a protective sleeve, the first sleeve end of the protective sleeve is sleeved on the first elastic portion of the spring, and the second sleeve end of the protective sleeve is hooked and sleeved on the second elastic portion of the spring.

As a preferred solution, two support blocks are provided at the same horizontal distance on both sides of the inner surface of the back support, and two joint seats are provided at the same horizontal distance on both sides of the bottom of the back of the backrest. The two support blocks They are pivotally connected with the two joint seats respectively.

As a preferred solution, the support blocks are respectively provided with first transverse shaft holes, and each joint seat is respectively provided with second transverse shaft holes and a groove opening to the rear, and the support block is embedded in the groove In the middle, the first transverse axis hole and the second transverse axis hole are facing each other; a shaft penetrates the first transverse axis hole and the second transverse axis hole transversely to form a pivot structure between the support block and the joint seat .

As a preferred solution, a buffer pad is arranged in the middle of the elastic member.

As a preferred solution, a fence for limiting the elastic component is provided on the back of the backrest.

Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, it can be seen from the above-mentioned technical scheme that the backrest is pivotally connected to the backrest so that the backrest can rotate freely relative to the backrest, and then The backrest and the back support are provided with a connection limit structure and an elastic part. Using the connection limit structure, the backrest and the back support can obtain a separate reclining activity space, and the backrest can be reclined without opening the structure, and the backrest is blocked. To turn outwards too much; use the elastic part to elastically support the back of the backrest, provide the backrest with a cushioning elasticity to act on the back of the person, so that the backrest of the chair can automatically adjust its tilting angle according to the size of the user's backrest force, and improve the user's Comfort of use. At the same time, the connection limit structure of this embodiment adopts the cooperation of screw rod and nut, and the elastic part adopts shrapnel or spring, which can greatly simplify the structure of the product, facilitate production assembly, improve production efficiency, and help reduce product cost. And, since both ends of the elastic component are fitted on the screw rod, the screw rod can be used to restrict the elastic component from shifting left and right, thereby helping to ensure the stability of the elastic component during deformation and improve its elastic working performance.

In order to more clearly illustrate the structural features and effects of the utility model, the utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments:

Description of drawings

Fig. 1 is the assembly perspective view of the embodiment of the utility model;

Fig. 2 is the exploded view of the first preferred embodiment of the utility model;

Figure 3 is an enlarged view of the shrapnel in the first preferred embodiment of the utility model;

Fig. 4 is a three-dimensional enlarged view of the back support in the first preferred embodiment of the present utility model;

Fig. 5 is a diagram of the use state of the first preferred embodiment of the utility model under the unstressed state;

Fig. 6 is a diagram of the use state of the first preferred embodiment of the utility model under a stressed state.

Fig. 7 is the exploded view of the second preferred embodiment of the present utility model;

Fig. 8 is a partial state diagram of the second preferred embodiment of the utility model in use under the unstressed state;

Fig. 9 is a partial view of the second preferred embodiment of the utility model in use under a stressed state.

Explanation of the accompanying drawings:

1. Back support 23. Combined seat

11. Horizontal support plate 24. Groove

12. Vertical support plate 25. Second transverse shaft hole

13. Screw hole 26. Through hole

14. Small square hole 27. Positioning fence

15. Support block 28. Shaft

16. The first transverse shaft hole 3. Connection limit structure

2. Backrest 31. Screw

21. Lower horizontal plate 32. Nut

22. Middle horizontal plate 33. First end

34. Second end 42. Spring

35. Convex ring 421. The first bullet

4. Elastic part 422. The second elastic part

41. Shrapnel 5. Cushion pad

411. Arc connection part 51. Protruding column

412. First elastic arm 6. Protective cover

413. The second elastic arm 61. The first sleeve end

414. Slotted hole 62. Second sleeve end

Detailed ways:

Please refer to Fig. 1 to Fig. 6, which shows the specific structure of the first preferred embodiment of the present utility model, including a back support 1, a backrest 2 and a connection between the back support 1 and the backrest 2 Limiting structure 3 and elastic component 4.

Specifically, wherein, the back support 1 in this embodiment is L-shaped, and includes a transverse brace 11 and a vertical brace 12 connected to each other. out) connection, the vertical support plate 12 is used to be connected with the backrest 2. Two screw holes 13 are provided on the same horizontal position on both sides of the inner surface of the vertical brace 12, and two small square holes 14 are arranged on both sides of each screw hole 13; and, inside the vertical brace 12 Two support blocks 15 are provided at the same horizontal position on both sides of the lower part of the side surface, and the first transverse shaft holes 16 on the same axis are respectively provided on the two support blocks 15 .

The backrest 2 in this embodiment is a "day"-shaped frame formed by splicing three horizontal plates and two vertical plates. Wherein, on the back side of this lower transverse plate 21, two combining seats 23 on the same horizontal position are arranged, and the distance between the two combining seats 23 is the same as the distance between the two supporting blocks 15 on the aforementioned back support 1. 23 is provided with a groove 24 opening outwards, the width of the groove 24 is slightly larger than the thickness of the aforementioned support block 15, and the two coupling seats 23 are respectively provided with second transverse shaft holes 25 on the same axis. Two through holes 26 at the same level are arranged on the back side of the middle horizontal plate 22, and a positioning fence 27 is protruded around each through hole 26, and the positioning fence 27 is used for limiting one end of the elastic member 4. .

The aforementioned two support blocks 15 are respectively embedded in the grooves 24 of the two joint seats 23, and the first transverse axis hole 16 on the support block 15 is opposite to the second transverse shaft hole 25 on the joint seat 23. The rod 28 penetrates into the first transverse shaft hole 16 and the second transverse shaft hole 25 transversely, so that the backrest 2 and the back support 1 are pivotally connected to each other, so that the backrest 2 can turn over around the shaft rod 28 .

The connection limiting structure 3 is used to connect between the backrest 2 and the backrest 1 to prevent the backrest 2 from being turned away from the backrest 1 and tilted outward. The connection limiting structure 3 in this embodiment includes a screw rod 31 and a nut 32, the two ends of the screw rod 31 are respectively provided with external threads, and a protruding ring 35 is provided beside the external threads of the first end 33 on the screw rod 31 , and, the first end 33 of the screw 31 is screwed into the screw hole 13 on the back support 1, and the second end 34 of the screw 31 passes through the through hole 26 on the backrest 2 and is screwed into the backrest 2. nut 32, and the nut 32 is blocked on the front side of the cross plate 22 in the backrest 2. Since the screw rod 31 has a considerable length, there remains a movable space between the back of the backrest 2 and the back support 1 .

The elastic member 4 in the present embodiment is an elastic piece 41 of a U-shaped structure with an upward unidirectional opening. The material of the elastic piece 41 is preferably metal with elastic properties such as iron or alloy, which includes an arc-shaped connecting portion 411 and a self-supporting A first elastic arm 412 and a second elastic arm 413 integrally extend from the arc-shaped connecting portion 411 to both sides. Utilizing the deformability of the arc-shaped connecting portion 411 , there is elastic expansion between the first elastic arm 412 and the second elastic arm 413 . The elastic piece 41 is located in the aforementioned movable space, and its first elastic arm 412 is sleeved on the first end 33 of the aforementioned screw rod 31, and is pressed against the back support 1 by the protruding ring 35 on the screw rod 31; the second elastic arm 413 has a long hole 414, utilize this long hole 414 to cover the second end 34 of the aforementioned screw rod 31, the width of the long hole 414 is slightly larger than the outer diameter of the screw rod 31, so that the long hole 414 can be The function of lateral limit can prevent the second elastic arm 413 from shifting left and right during the movement. At the same time, the second elastic arm 413 pushes against the fence 27 on the back of the backrest 2 to provide an outward thrust of the backrest 2, so that the backrest 2 always keeps away from the backrest 1 under normal conditions.

And, preferably a buffer pad 5 is set on the protruding ring 35 of the screw rod 31, and the buffer pad 5 is located between the first elastic arm 412 and the second elastic arm 413, and is used for when the first elastic arm 412 and the second elastic arm 412 When the two arms of the elastic arm 413 are squeezed, they play the role of cushioning and protection. The buffer pad 5 is provided with two protruding posts 51, and the two protruding posts 51 are inserted and fixed in the small square hole 14 on the back support 1, so that the buffer pad 5 wraps the protruding ring 35 of the screw rod 31, and the first spring Arm 412 acts as a second level of stabilization.

The working principle of this embodiment is described in detail as follows:

When the chair back is not in use, referring to FIG. 5 , the backrest 2 leans forward against the nut 32 under the elastic support of the elastic piece 41 to maintain an upright posture. When the user leans on the backrest 2 of the chair back, as shown in Figure 6, under the thrust of the user's back, the backrest 2 turns backward around the shaft 28, and the backrest 2 pushes the second elastic arm 413 of the elastic piece 41 to the second elastic arm 413. As the elastic arms 412 move closer together, the elastic force of the elastic piece 41 gradually increases, and the elastic buffer force of the backrest 2 provided by the elastic piece 41 acts on the back of the person, so that the user can obtain a comfortable backrest experience. When the user uses too much force to make the second elastic arm 413 close to the first elastic arm 412, the second elastic arm 413 is squeezed on the buffer pad 5 without colliding with the first elastic arm 412, so as to avoid long-term collision and cause damage.

With reference to shown in Fig. 7, it shows the decomposition structure of the second preferred embodiment of the present utility model, and the difference of this embodiment and aforementioned first preferred embodiment is the difference of its elastic member, and the elastic member among the present embodiment It is a spring 42 with telescopic elasticity. The spring 42 has a first elastic part 421 and a second elastic part 422. The first elastic part 421 is pushed against the back support, and the second elastic part 422 is elastically pushed against the backrest. 42. There is a protective cover 6 on the outside, which is in the shape of folds and can be stretched elastically. The spring 42 is sleeved in the protective cover 6 so that it is protected from external interference and damage, which affects its service life. The first sleeve end 61 of the protective cover 6 is sleeved on the first elastic portion 421 of the spring 42, the second sleeve end 62 of the protective sleeve 6 is hooked and sleeved on the second elastic portion 422 of the spring 42, and the first elastic portion 421 of the spring 42 is set The first end 33 of the screw rod 31 is embedded in the back support 1 together with the first sleeve end 61 , and the second elastic portion 422 of the spring 42 is sleeved on the second end 34 of the screw rod 31 together with the second sleeve end 62 Embedded in the back of the backrest 2. When the chair back is not in use, referring to FIG. 8 , the backrest 2 leans forward against the nut 32 under the elastic support of the spring 42 to maintain an upright posture. When the user leans on the backrest 2 of the chair back, as shown in Figure 9, under the thrust of the user's back, the backrest 2 turns backward around the shaft 28, and the backrest 2 pushes the second elastic part 422 of the spring 42 to the second spring 42. As soon as the elastic part 421 gets closer, the elastic force of the spring 42 gradually increases, and the spring 42 provides the elastic buffer force of the backrest 2 to act on the back of the person, so that the user can obtain a comfortable backrest experience.

To sum up, the key point of the design of this utility model is to pivotally connect the backrest to the backrest, so that the backrest can rotate freely relative to the backrest, and then set a connection limit structure and elastic support between the backrest and the backrest. Parts, use the connection limit structure to obtain a separate reclining activity space between the backrest and the back support, you can recline without opening the structure, and block the backrest from turning outwards too much; use the elastic component to elastically support the backrest The back of the back provides a cushioning elasticity to act on the back of the person, so that the back of the chair can automatically adjust its reclining angle according to the size of the user's backrest force, improving the comfort of the user. At the same time, the connection limit structure of this embodiment adopts the cooperation of screw rod and nut, and the elastic part adopts shrapnel or spring, which can greatly simplify the structure of the product, facilitate production assembly, improve production efficiency, and help reduce product cost. And, since both ends of the elastic component are fitted on the screw rod, the screw rod can be used to restrict the elastic component from shifting left and right, thereby helping to ensure the stability of the elastic component during deformation and improve its elastic working performance.

The above are only preferred embodiments of the present utility model, and are not intended to limit the technical scope of the present utility model, so any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present utility model are still valid. It belongs to the scope of the technical solution of the utility model.

Claims (10)

1. An elastic chair back, including a back support and a backrest, is characterized in that: the backrest is pivotally connected to the back support, so that the backrest can be turned over with respect to the back support; There is a connection limit structure and an elastic part. One end of the connection limit structure is fixedly connected to the back support, and the other end of the connection limit structure is blocked on the backrest to limit the turning distance of the backrest away from the direction of the back support, and at the same time make the backrest and backrest An activity space is kept between the braces; the elastic component is arranged in the activity space, one end of the elastic component pushes against the back support, and the other end of the elastic component pushes against the backrest. 2. The elastic chair back according to claim 1, characterized in that: the connection limiting structure includes a screw and a nut, and the first end and the second end of the screw are respectively provided with external threads, The first end of the screw is screwed and fixed on the back support, the second end of the screw passes through the back of the back and is screwed with a nut, and is blocked by the nut on the front side of the back. 3. The elastic chair back according to claim 2, characterized in that: the elastic member is an elastic piece, and the elastic piece has a first elastic arm and a second elastic arm, the first elastic arm pushes against the back support, and the second elastic arm pushes against the back support. The two elastic arms are elastically pushed against the backrest; the first elastic arm of the elastic piece is sleeved on the first end of the screw rod, the second elastic arm of the elastic piece is sleeved on the second end of the screw rod, and the second elastic arm is provided with a support for the screw rod. The elongated hole through which the second end passes. 4. The elastic chair back according to claim 3, characterized in that: the elastic piece is U-shaped, which includes an arc-shaped connecting portion, and the first elastic arm and the second elastic arm are formed from two arc-shaped connecting portions. The ends are integrally extended. 5. The elastic chair back according to claim 2, characterized in that: the elastic member is a spring, the spring has a first elastic part and a second elastic part, the first elastic part pushes against the back support, and the second elastic part The two elastic parts elastically push against the backrest; the first elastic part of the spring is sleeved on the first end of the screw rod, and the second elastic part of the spring is sleeved on the second end of the screw rod. 6. The elastic chair back according to claim 5, characterized in that: said spring is covered with a protective cover, the first cover end of the protective cover is placed on the first elastic part of the spring, and the second cover end of the protective cover The hook is set on the second elastic part of the spring. 7. The elastic chair back according to claim 1, characterized in that: two support blocks are arranged at the same horizontal position on both sides of the inner surface of the back support, corresponding to the same horizontal position on both sides of the back bottom of the backrest Two coupling seats are arranged at intervals, and the two support blocks are pivotally connected with the two coupling seats respectively. 8. The elastic chair back according to claim 7, characterized in that: first transverse shaft holes are respectively provided on the support blocks, and second transverse shaft holes and rearward openings are respectively provided on each combination seat. A groove, the support block is embedded in the groove, the first transverse axis hole and the second transverse axis hole are facing each other; a shaft penetrates the first transverse axis hole and the second transverse axis hole transversely to form the A pivotal structure between the support block and the joint seat. 9. The elastic chair back according to claim 1, wherein a buffer pad is arranged in the middle of the elastic member. 10. The elastic chair back according to claim 1, characterized in that: a fence for limiting the elastic component is arranged on the back of the backrest.

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