CN214631134U - Chair back - Google Patents

Abstract

The utility model discloses a chair back, which comprises a back support, a lower back plate and a first elastic part, wherein the lower back plate is rotatably connected with the back support, the first elastic part acts on the lower back plate, and when the lower back plate rotates relative to the back support, the first elastic part deforms; when the lower back plate has no external force, the first elastic piece drives the lower back plate to reset. Due to the fact that the lower back plate is rotatably connected with the back support, when a user leans on, the lower back plate can rotate relative to the back support in a manner of being matched with the waist and the back of the user, and the self-adaptive effect is achieved. And on first elastic component acted on the backplate down, when user's waist and backplate separation down, the backplate automatic re-setting under the restoring force drive of torsional spring does not need user's manual regulation to reset.

Description

Chair back

Technical Field

The utility model relates to a seat technical field, more specifically the utility model relates to a seat back of a chair.

Background

The chair is used as an indispensable seat in work and life, the requirement on the comfort of the chair is higher and higher, so that the chair with the upper and lower separated chair backs is provided, the upper back plate is used for bearing the back of a human body, the lower back plate is attached to the waist of the human body, and the problems can be solved through a more targeted design after the upper back plate and the lower back plate are separated. In the prior art, in most of chairs with upper and lower separating type chair backs, the front back is designed for comfort, and the back is designed for stability of the chair back structure, so that the back is generally rigid, only plays a role in supporting the front back and connecting a chair seat, and the chair back is not easy to damage. But different users are different to the angle demand of lumbar support, and traditional upper and lower disconnect-type back of the chair can't adjust the angle of placing of back board down, can't satisfy different users ' the demand of leaning on.

Disclosure of Invention

In order to solve the above technical problem, the present invention provides a rotatable chair back with a lower back plate for adjusting the angle of the lower back plate.

Solve the technical problem, the utility model discloses take following technical scheme:

a chair back comprises a back support, a lower back plate and a first elastic piece, wherein the upper end of the lower back plate is suspended in the air, the bottom end of the lower back plate is rotatably connected with the back support, the first elastic piece acts on the lower back plate, and when the lower back plate rotates relative to the back support, the first elastic piece deforms; when the lower back plate has no external force, the first elastic piece drives the lower back plate to reset.

In a further scheme, the back support further comprises a rotating shaft, a fixing plate is arranged at the bottom end of the lower back plate, a fixing block is arranged at the bottom end of the back support, the rotating shaft penetrates through the fixing plate and the fixing block along the width direction of the lower back plate, and the lower back plate can rotate around the rotating shaft relative to the back support; the first elastic part is a torsion spring which is sleeved on the rotating shaft, and two ends of the torsion spring are respectively connected with the lower back plate and the back support.

In a further scheme, the back support further comprises a movable limiting part, a second elastic part, a cam and a handle, wherein the movable limiting part is movably arranged on the back support, the second elastic part acts on the movable limiting part, the cam is hinged with the lower back plate, the handle is fixedly connected with the cam, and when the handle drives the cam to rotate relative to the lower back plate, the handle can perform state conversion between a locking position and an unlocking position; in the unlocking position, the cam abuts against the movable limiting part and pushes the movable limiting part to be away from a hinge point of the cam and the lower back plate, so that the lower back plate can rotate relative to the back support, and the second elastic part deforms; when the unlocking position is converted to the locking position, the cam rotates to enable an interval to be formed between the cam and the movable limiting part, and the restoring force of the second elastic part drives the movable limiting part to reset; in the locking position, the movable limiting part is in plug fit with the lower back plate, so that the lower back plate and the back support are relatively fixed.

The cam is driven to push the movable limiting part to move away from the lower back plate by rotating the handle, so that the lower back plate can rotate relative to the back support, and the lower back plate can be conveniently adjusted to meet the seating requirements of different users.

After the adjustment is finished, the movable limiting part is reset only by reversely rotating the handle, the movable limiting part is matched with the lower back plate in an inserting mode, the lower back plate and the back support are relatively fixed, the lower back plate cannot rotate any more, the locking is completed, and the operation is convenient and fast.

In a further scheme, one of the movable limiting piece and the lower back plate is provided with a multistage step, and the other of the movable limiting piece and the lower back plate is provided with a bulge; in the locking position, the protrusions are inserted into the corresponding steps and abut against each other, so that the lower back plate and the back support are kept relatively fixed.

Through being provided with multistage step on one in activity locating part and the backplate down, be provided with the arch on another in activity locating part and the backplate down, support each other in the protruding step that inserts the correspondence of latched position and lean on each other, play limiting displacement to the arch through the step, realize the locking function.

In a further scheme, the protrusion is arranged on the lower back plate, the multistage steps are arranged on one side end face, opposite to the protrusion, of the movable limiting part and are arranged along the thickness direction of the movable limiting part, and the cam is gradually kept away from the side wall of each step from one side end face, close to the back support, of the movable limiting part to one side end face, far away from the back support, of the movable limiting part.

In a further scheme, the end face of one side of the protrusion, which is in contact with the step face of the step, is an arc-shaped face. The end face of one side, contacting with the step face of the step, of the protrusion is set to be an arc-shaped face, and therefore the protrusion is prevented from being broken due to stress concentration.

In a further scheme, the second elastic member is a spring, a stop block is arranged on the back support, two ends of the spring respectively abut against the stop block and a movable limiting member, and the movable limiting member is located between the stop block and the cam; in the unlocked position, the spring compresses itself.

In a further scheme, a limiting plate is arranged on the back support, a limiting groove is formed in one of the limiting plate and the movable limiting part, a limiting block is arranged on the other one of the limiting plate and the movable limiting part, and when the cam pushes the movable limiting part to be away from a hinge point of the cam and the lower back plate, the limiting block slides in the limiting groove. The movable limiting block is provided with a sliding guide function through the matching of the limiting groove and the limiting block.

In a further scheme, a boss is arranged on the cam, the cam is unlocked, the boss abuts against the movable limiting part, and two end faces, which are contacted with the movable limiting part, of the boss are two planes which can be mutually attached. Through the bellying with two terminal surfaces that contact between the activity locating part are two planes that can laminate each other, increase the cam and the activity locating part when offseting frictional force between the two, avoid the cam self to take place to rotate when adjusting backplate turned angle and lead to the locking of activity locating part gliding.

Advantageous effects

1. Due to the fact that the lower back plate is rotatably connected with the back support, when a user leans on, the lower back plate can rotate relative to the back support in a manner of being matched with the waist and the back of the user, and the self-adaptive effect is achieved. And on first elastic component acted on the backplate down, when user's waist and backplate separation down, the backplate automatic re-setting under the restoring force drive of torsional spring does not need user's manual regulation to reset.

2. And the movable limiting part is movably arranged on the back support, the second elastic part acts on the cam on the movable limiting part to be rotatably connected with the lower back plate, and the handle is fixedly connected with the cam. If the user wants to fix lower backplate on appointed angle, only need the reverse rotation handle make the activity locating part reset, the activity locating part with backplate grafting cooperation down, lower backplate and back of the body support keep relatively fixed, and lower backplate just can not rotate again, accomplishes the locking, convenient and fast. When the user wants to adjust the lower back plate, the user only needs to rotate the handle to drive the cam to push the movable limiting part to move away from the lower back plate, and then unlocking can be completed.

Drawings

Fig. 1 is a schematic structural view, i.e., a partially enlarged view, of a seat back in embodiment 1;

FIG. 2 is a schematic view showing the structure of a back support in example 1;

FIG. 3 is a seat with a seat back of embodiment 2;

FIG. 4 is a front view of a seat back in embodiment 2;

FIG. 5 is a cross-sectional view A-A of FIG. 4;

FIG. 6 is an enlarged view of portion A of FIG. 5;

FIG. 7 is an isometric cross-sectional view A-A of FIG. 4;

FIG. 8 is an enlarged view of portion B of FIG. 7;

fig. 9 is a schematic structural view of a movable limiting member in embodiment 2;

fig. 10 is a schematic view and a partial enlarged view of the structure of the lower back plate with the handle and the cam in embodiment 2.

The reference numerals in the schematic drawings illustrate:

1-back support, 2-upper back plate, 3-lower back plate, 4-fixing plate, 5-fixing block, 6-movable limiting piece, 7-second elastic piece, 8-step, 9-protrusion, 10-cam, 11-handle, 12-protrusion, 13-limiting plate, 14-limiting piece, 15-limiting groove, 16-first elastic piece, 17-stop block and 18-rotating shaft.

Detailed Description

For a further understanding of the present invention, reference will now be made in detail to the present invention, examples of which are illustrated in the accompanying drawings.

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

Example 1: referring to fig. 1 and fig. 2, the present embodiment provides a chair back, including a back support 1, an upper back plate 2 and a lower back plate 3 are disposed on the back support 1, wherein the lower back plate 3 is rotatably connected to the back support 1. In order to realize that the lower back plate 3 can rotate relative to the back support 1, the back support device further comprises a rotating shaft 18, the bottom end of the lower back plate 3 is provided with a fixing plate 4, the bottom end of the back support 1 is provided with a fixing block 5, and the rotating shaft 18 penetrates through the fixing plate 4 and the fixing block 5 along the width direction of the lower back plate 3, so that the lower back plate 3 can rotate relative to the back support 1 around the rotating shaft 18.

Meanwhile, the back support comprises a first elastic piece 16, the first elastic piece 16 acts on the lower back plate 3, and when the lower back plate 3 rotates relative to the back support 1, the first elastic piece 16 deforms. When the lower back plate 3 has no external force, the first elastic member 16 drives the lower back plate 3 to reset. In a specific embodiment, the first elastic member 16 is a torsion spring, the torsion spring is sleeved on the rotating shaft 18, and two ends of the torsion spring are respectively connected to the lower back plate 3 and the back bracket 1.

The user can rely on lower backplate 3 to make lower backplate 3 take place to rotate in certain angle for lower backplate 3 can play self-adaptation to hold the effect of leaning on to user's back. And when the lower back plate 3 rotates within a certain angle, the torsion spring deforms at the moment. And when the waist of the user is separated from the lower back plate 3, the restoring force of the torsion spring drives the lower back plate 3 to automatically reset without manual adjustment of the user.

Example 2: referring to fig. 3 to 10, the present embodiment is different from the chair back of the above embodiment 1 mainly in that the present embodiment further includes a handle 11 and a cam 10, the handle 11 is fixedly connected to the cam 10, and the cam 10 is rotatably connected to the lower back plate 3. Specifically, as shown in fig. 8, the cam 10 is located beside the fixing plate 4, and the cam 10 penetrates through the rotating shaft 18 such that the cam 10 can rotate around the rotating shaft relative to the lower back plate 3.

Referring to fig. 5-9, a movable limiting member 6 is movably disposed on the back bracket 1, a second elastic member 7 acts on the movable limiting member 6, and as shown in fig. 9, a plurality of steps 8 are disposed on the movable limiting member 6, the plurality of steps 8 are arranged along the thickness direction of the movable limiting member 6, and the side wall of the step 8 gradually gets away from the cam 10 from the end surface of the movable limiting member 6 near the back bracket 1 to the end surface of the movable limiting member 6 far away from the back bracket 1. Meanwhile, the lower back plate 3 is further provided with a protrusion 9 which can be matched with the step 8 in an inserting manner, and in the scheme, the protrusion 9 is positioned on one side end face of the fixed plate 4 close to the movable limiting part 6.

When the handle 11 drives the cam 10 to rotate relative to the lower backboard 3, the handle 11 can be switched between the locking position and the unlocking position. As shown in fig. 10, the cam 10 is provided with a boss 12 protruding outward. When the handle 11 drives the cam 10 to rotate in one direction, the protrusion 12 on the cam 10 gradually approaches to and abuts against the movable limiting part 6, and along with the rotation of the cam 10, the protrusion 12 on the cam 10 pushes the movable limiting part 6 to move, and the movable limiting part 6 gradually leaves away from the hinge point between the cam 10 and the lower back plate 3, so as to force the second elastic part 7 to deform. As a specific embodiment, as shown in fig. 4, the second elastic member 7 is a spring, a stopper 17 is disposed on the back bracket 1, two ends of the spring respectively abut against the stopper 17 and the movable limiting member 6, and the movable limiting member 6 is located between the stopper 17 and the cam 10. When the cam 10 is pushed by the boss 12 to move the movable limiting member 6, the spring is compressed. When the handle rotates continuously along the direction until the handle is located at the unlocking position, the movable limiting part 6 is far away from the hinge point of the cam 10 and the lower back plate 3, and the bulge 9 on the lower back plate 3 is separated from the step 8 on the movable limiting part 6 and is provided with a space. At this moment, lower backplate 3 loses can rotate for back support 1 after protruding 9 and step 8's cooperation is spacing, and the user can rely on making lower backplate 3 take place to rotate in certain angle on lower backplate 3 for lower backplate 3 can play self-adaptation to hold the effect of leaning on to user's back. And when the lower back plate 3 rotates within a certain angle, the torsion spring deforms at the moment. And when the waist of the user is separated from the lower back plate 3, the restoring force of the torsion spring drives the lower back plate 3 to automatically reset without manual adjustment of the user.

When a user wants to fix the lower back plate 3 at a specific position, the user only needs to rotate the handle 11 in the reverse direction, the handle 11 drives the cam 10 to rotate in the reverse direction, the handle 11 rotates from the unlocking position to the locking position, and the boss 12 on the cam 10 is staggered with the movable limiting part 6, so that a gap is formed between the cam 10 and the movable limiting part 6. And in the process that the handle 11 rotates from the unlocking position to the locking position, the restoring force of the spring drives the movable limiting part 6 to retreat and reset. When the handle 11 is rotated to the locking position, the protrusions 9 on the lower back plate 3 are inserted into the corresponding steps 8 and abut against each other, and the step surfaces on the steps 8 form a limit position to the protrusions 9 on the lower back plate 3, so that the lower back plate 3 cannot rotate relative to the back support 1, and the locking is completed.

Through the structure, the user can rely on the lower back plate 3 to rotate the lower back plate 3 within a certain angle, so that the lower back plate 3 can play a self-adaptive bearing effect on the waist and back of the user. The user can also lock the lower back plate 3 so that the lower back plate 3 stays at a comfortable angle.

And as a better embodiment, the end surface of one side of the bulge 9, which is contacted with the step surface of the step 8, is an arc-shaped surface. One side end face of the protrusion 9 contacting with the step face of the step 8 is set to be an arc-shaped face, so that the protrusion 9 is prevented from being broken due to stress concentration.

Meanwhile, two end faces of the protruding portion 12 contacting with the movable limiting member 6 are two planes capable of being attached to each other. When the backboard 3 is adjusted to rotate, the cam 10 rotates to cause the movable limiting part 6 to slide downwards so as to lock the backboard 3.

It should be noted that, in the present embodiment, the multistage step 8 is disposed on the movable limiting member 6, and the protrusion 9 is disposed on the lower back plate 3. However, it is also feasible that the multistage steps 8 are disposed on the fixed plate 4, the protrusions 9 are disposed on the movable limiting member 6, the lower back plate 3 drives the fixed plate 4 to rotate until the corresponding steps 8 are aligned with the protrusions 9 on the movable limiting member 6, and the protrusions 9 on the movable limiting member 6 are inserted into the steps 8 on the fixed plate 4 to form limiting.

It should be noted that, in this embodiment, a plug-in manner is adopted in which a step 8 is disposed on the movable limiting member 6 and the step 8 is matched with the protrusion 9 on the lower back plate 3. However, under the condition that the lower back plate 3 cannot rotate relative to the back support 1 when the lower back plate is in the locking position, a plurality of insertion holes may be formed in the movable limiting member 6 along the thickness direction, and the protrusions 9 on the fixing plate 4 may be inserted into the corresponding insertion holes to form an insertion fit.

In this scheme, still be provided with limiting plate 13 on the back of the body support 1, be provided with stopper 14 on the limiting plate 13, and then be provided with spacing groove 15 on the activity locating part 6. The limiting block 14 is located in the limiting groove 15, and when the cam 10 pushes the movable limiting block 6 to be away from the hinge point between the cam 10 and the lower back plate 3, the limiting block 14 slides in the limiting groove 15. As shown in fig. 6, the movable limiting block 14 is guided in a sliding manner by the matching of the limiting groove 15 and the limiting block 14, so that the movable limiting block 6 is limited, and the movable limiting block 6 cannot slide left and right. And the limiting plate 14 covers the upper part of the movable limiting part 6, so that the movable limiting part 14 is prevented from being separated from the back support 1.

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.

Claims (9)

1. A chair back is characterized by comprising a back support, a lower back plate and a first elastic piece, wherein the upper end of the lower back plate is suspended in the air, the bottom end of the lower back plate is rotatably connected with the back support, the first elastic piece acts on the lower back plate, and when the lower back plate rotates relative to the back support, the first elastic piece deforms; when the lower back plate has no external force, the first elastic piece drives the lower back plate to reset.

2. The chair back of claim 1, further comprising a rotating shaft, wherein a fixed plate is disposed at the bottom end of the lower back plate, a fixed block is disposed at the bottom end of the back support, the rotating shaft penetrates through the fixed plate and the fixed block along the width direction of the lower back plate, and the lower back plate can rotate around the rotating shaft relative to the back support; the first elastic part is a torsion spring which is sleeved on the rotating shaft, and two ends of the torsion spring are respectively connected with the lower back plate and the back support.

3. The chair back of claim 1, further comprising a movable limiting member, a second elastic member, a cam and a handle, wherein the movable limiting member is movably disposed on the back bracket, the second elastic member acts on the movable limiting member, the cam is hinged to the lower back plate, the handle is fixedly connected to the cam, and when the handle drives the cam to rotate relative to the lower back plate, the handle can perform state conversion between a locking position and an unlocking position; in the unlocking position, the cam abuts against the movable limiting part and pushes the movable limiting part to be away from a hinge point of the cam and the lower back plate, so that the lower back plate can rotate relative to the back support, and the second elastic part deforms; when the unlocking position is converted to the locking position, the cam rotates to enable an interval to be formed between the cam and the movable limiting part, and the restoring force of the second elastic part drives the movable limiting part to reset; in the locking position, the movable limiting part is in plug fit with the lower back plate, so that the lower back plate and the back support are relatively fixed.

4. The chair back according to claim 3, wherein one of the movable limiting piece and the lower back plate is provided with a multi-step, and the other of the movable limiting piece and the lower back plate is provided with a protrusion; in the locking position, the protrusions are inserted into the corresponding steps and abut against each other, so that the lower back plate and the back support are kept relatively fixed.

5. The chair back of claim 4, wherein the protrusion is disposed on the lower back plate, the multistage steps are disposed on a side end surface of the movable limiting member opposite to the protrusion, the multistage steps are arranged along a thickness direction of the movable limiting member, and the cam is gradually separated from a side end surface of the step, close to the back support, of the movable limiting member to a side end surface of the movable limiting member, far away from the back support.

6. The chair back according to claim 4, wherein an end surface of the protrusion contacting the step surface of the step is an arc surface.

7. The chair back according to claim 3, wherein the second elastic member is a spring, a stopper is disposed on the back bracket, two ends of the spring respectively abut against the stopper and a movable limiting member, and the movable limiting member is located between the stopper and the cam; in the unlocked position, the spring compresses itself.

8. The chair back according to claim 3, wherein the back bracket is provided with a limiting plate, one of the limiting plate and the movable limiting member is provided with a limiting groove, the other of the limiting plate and the movable limiting member is provided with a limiting block, and when the cam pushes the movable limiting member to be away from a hinge point of the cam and the lower back plate, the limiting block slides in the limiting groove.

9. The chair back according to claim 3, wherein the cam is provided with a protrusion, the protrusion abuts against the movable limiting member in the unlocking position, and two end surfaces of the protrusion contacting with the movable limiting member are two planes capable of being attached to each other.

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