TWI746773B - Chair back curvature adjustment device - Google Patents

Abstract

The chair back curvature adjustment device includes a flexible chair back, a post, a first holding mechanism, a second holding mechanism and a locking mechanism. The first holding mechanism is connected between a first position of the chair back and the post. The second holding mechanism is connected between a second position of the chair back and the post and has a second connecting portion connected to the second position of the chair back and a second moving portion capable of moving on the post, wherein the second connecting portion composed of a fixing portion connected to the second moving portion, an extending portion connected to the chair back and a positioning mechanism connected between the extending portion and the fixing portion. The extending portion can be moved against the fixing portion and positioned by the positioning mechanism. By the movement of the extending portion, the second connecting portion can be retracted or stretched so as to further change the curvature of the chair back.

Description

Chair back curvature adjusting device

The present invention relates to a chair, in particular to a chair back curvature adjustment device that can adjust the curvature and position of the chair back according to the requirements of use, so as to make it more close to the back.

In order to increase the comfort of the ride, the backrest requirement of the chair back is definitely one of the indispensable factors. After sitting for a long time, if the human back is not properly supported, not only will the back pain be felt, but the spine will also be caused. Permanent damage such as deformation.

In the previous technology, the seat back is raised to change the curvature of its surface in an inflatable way, so that the occupant’s back and back can be supported. Although it can achieve a certain effect, it is expensive; and these inflatable elements must be embedded in the seat back. , It will be difficult to repair and maintain if there is a failure or wrong action. Furthermore, these inflatable elements are buried in a fixed position, and after expansion, they can only provide a specific part of the body to support the back, and cause the deformation of the seat back to be limited, which is difficult to fully meet the needs of the occupants.

In addition, the “adjustable seat back device” disclosed in the inventor’s previous application No. 105127965 patent can achieve the function of adjusting the curvature of the seat back with a simple assembly and structure, but the curvature of the seat back can only be adjusted longitudinally. After the displacement of the second holding mechanism changes the curvature of the back of the chair, if the lower part of the back of the chair is bent at a larger angle, it may not be able to completely stick to the back of the human body, and the support is slightly insufficient.

The present invention is a chair back curvature adjustment device. Compared with the prior art, it has the advantages of convenient assembly, easy operation and maintenance, and better ductility of the chair back curvature adjustment. It mainly includes a flexible chair back , A first holding mechanism, a second holding mechanism, a bracket supporting the back of the chair, and at least one locking mechanism. The first holding mechanism is connected between the first position of the seat back and the bracket, and the second holding mechanism is connected between the second position on the same side as the first position of the seat back and the bracket, so that the seat back is held on the bracket On; wherein, the second holding mechanism has a second connecting portion and a second movable portion, the second connecting portion is connected with the second position of the seat back, the second movable portion can be freely slid on the bracket, by The locking mechanism fixes the second movable part on the bracket. When the first holding mechanism is held in place, the sliding of the second movable part can link the chair back to deform and change its curvature, so as to adjust the position of the back support of the human body to have the back-adhesiveness.

In particular, the second connecting portion is composed of a fixed portion connected to the second movable portion, an extension portion connected to the seat back 1, and a positioning mechanism connected between the extension portion and the fixed portion, The extension part can change the position axially relative to the fixed part, and the position is fixed by the positioning mechanism; in this way, by the lateral movement of the extension part, the wheelbase of the second connecting part can be extended or contracted, so that the seat back The curvature of the surface also has some changes to compensate for the adjustment of the curvature.

1‧‧‧Back

10‧‧‧First position

11‧‧‧Second position

110‧‧‧Fixed seat

2‧‧‧The first holding institution

20‧‧‧First connection part

21‧‧‧First Activity Department

210‧‧‧Guide rod

211‧‧‧fixing hole

3‧‧‧Second Holding Organization

30‧‧‧Second connecting part

300‧‧‧Fixed part

301‧‧‧Extension

302‧‧‧Positioning mechanism

3020‧‧‧Axle hole

3021‧‧‧Locating Rod

3022‧‧‧Perforations

3023‧‧‧stop

3024‧‧‧Thread

3025‧‧‧Operation Department

31‧‧‧Second Activity Department

310‧‧‧Sleeve

32‧‧‧Fixed rod

4‧‧‧Bracket

40‧‧‧Hollow part

41‧‧‧Locating hole

5‧‧‧Locking mechanism

Fig. 1 is an external view of a chair equipped with the present invention.

Figure 2 is an exploded view of the present invention.

Figure 3 is a combined diagram of the present invention.

Fig. 4 is an operation diagram of the present invention, showing the active state of the first holding mechanism.

Fig. 5 is another operation diagram of the present invention, showing the active state of the second holding mechanism.

Fig. 6 is a structural diagram of the second connecting portion of the present invention.

Fig. 7 is an exploded view of the second connecting part of the present invention.

Fig. 8 is an operation diagram of the second connecting part of the present invention.

As shown in Figures 1 to 3, the present invention includes a flexible seat back 1, a first holding mechanism 2, a second holding mechanism 3, a bracket 4 supporting the seat back 1, and at least one locking mechanism 5. , Wherein the first holding mechanism 2 is connected between the first position 10 of the chair back 1 and the bracket 4, and the second holding mechanism 3 is connected between the second position 11 of the chair back 1 and the bracket 4, so that the chair The back 1 is held on the bracket 4. When the first holding mechanism 2 is fixed, the second holding mechanism 3 is applied to slide on the bracket 4, and the second position 11 of the seat back 1 can be linked to change its relative to the bracket. 4; or, fix the second holding mechanism 3, and apply force to the first holding mechanism 2 to slide on the bracket 4, and the first position 10 of the seat back 1 can be linked to change its height position relative to the bracket 4 Or, simultaneously applying force to the first and second holding mechanisms 2, 3 to slide on the bracket 4, the first and second positions 10, 11 of the seat back 1 can be linked to change the height position relative to the bracket 4; If the surface of the seat back 1 has a curvature change, it can correspond to the required supporting position of the back of the human body and make it more closely attached.

The first holding mechanism 2 has a first connecting portion 20 and a first movable portion 21, and the second holding mechanism 3 has a second connecting portion 30 and a second movable portion 31. Preferably, the first connecting portion The part 20 is connected to the top end of the seat back 1 when it is placed upright, the second connecting part 30 is connected to the bottom end of the seat back 1 on the same side, and the first and second movable parts 21, 31 are respectively sleeved on the bracket 4 Different height positions are fixed by a locking mechanism 5 and connected to the bracket 4 respectively. After the locking mechanism 5 is unlocked, the height positions of the two movable parts 21 and 31 relative to the bracket 4 can be adjusted. Therefore, as long as any one of the movable parts 21 (31) changes position, or the two movable parts 21, 31 change positions at the same time, the seat back 1 can be compressed or stretched to cause the surface of the seat back to change; in other words, the two movable parts The closer the distance between 21 and 31, the greater the curvature of the surface of the seat back 1, which also means that it can provide stronger support Conversely, the farther the distance between the two movable parts 21 and 31, the smaller the curvature of the surface of the seat back 1, which also means that it provides a softer support, which is a controllable adjustment. And with this adjustment, it is more able to meet the different back-attaching needs and comfort of users. In particular, the position of the raised surface of the seat back 1 can also be controlled by the same operation; that is, when the raised surface of the seat back 1 is in a lower position, it can be adapted to stick to the waist of the human body. 1 When the position of the surface bulge is adjusted to a higher position, it can be attached to the shoulder and neck of the human body as a leaning.

Preferably, the stent 4 of the present invention has a hollow portion 40, the first movable portion 21 has a guide rod 210, and a plurality of axially arranged fixing holes 211 are distributed on the surface, and the guide rod 210 is penetrated in the hollow In the portion 40, when the guide rod 210 moves in the hollow portion 40, the height position of the first position 10 of the seat back 1 is adjustable. The locking mechanism 5 has a fixing bolt (not shown in the figure). When locked, the fixing bolt passes through the bracket 4 and any fixing hole 211 in the interference guide rod 210 to move, so that the first position 10 of the seat back 1 is fixed.

Preferably, a plurality of positioning holes 41 arranged axially are arranged on the bracket 4, and the second movable portion 31 has a set of holes 310 to support the second movable portion 31 to slide on the bracket 4. The second movable part 31 is also equipped with a locking mechanism 5 at the same time. As mentioned above, the locking mechanism 5 has a fixing bolt that passes through the second movable part 31 and then extends into any positioning hole 41 when locked. The sliding of the second movable portion 31 is interfered, and the second position 11 of the seat back 1 is fixed. In addition, a fixing rod 32 is penetrated on the second connecting portion 30, and a fixing seat 110 is provided on the second position 11 of the corresponding seat back 1. The fixing seat 110 is used to assemble the fixing rod 32 so that the The second connecting portion 30 forms a detachable connection with the second position 11 of the seat back 1 to facilitate the replacement of related components after damage.

Fig. 4 is an operation diagram of the present invention. The first position 10 of the seat back 1 can be linked by the guide rod 210 of the first holding mechanism 2, and its height position can be adjusted freely in the bracket 4. At this time, if it is connected to the seat back 1 The second holding mechanism 3 at the second position 11 is fixed. By changing the first position 10 of the chair back 1, the chair back 1 can be deformed to obtain different curvature changes to fit the back of the human body. Finally, after the user confirms the backing requirement, it is fixed by the locking mechanism 5. Fig. 5 is another operation diagram of the present invention. Similarly, after the height of the seat back 1 is determined by the movement of the guide rod 210, the first position 10 is fixed by the locking mechanism 5, and the second holding is adjusted. The mechanism 3 links the second position 11 of the seat back 1 to deform the seat back 1 to obtain different curvature changes to fit against the back of the human body. Generally, it refers to the lower back part. Finally, the user determines the backing requirements Then it is fixed by the locking mechanism 5. Of course, if you want to maximize the extension or contraction of the flexible seat back 1, you can also adjust the positions of the first holding mechanism 2 and the second holding mechanism 3 relative to the bracket 4 at the same time to link the first holding mechanism of the seat back 1. The position 10 and the second position 11 change the curvature of the surface of the seat back 1.

Please continue to refer to Figures 6 and 7, the second connecting portion 30 of the present invention is composed of a fixed portion 300 connected to the second movable portion 31, an extension portion 301 connected to the seat back 1, and a The positioning mechanism 302 between the extension portion 301 and the fixing portion 300 is formed. The extension portion 301 can change its position axially relative to the fixing portion 300 and the position is fixed by the positioning mechanism 302.

The positioning mechanism 302 includes a long shaft hole 3020 provided on two opposite sides of the fixed portion 300, and a positioning rod 3021 passing through the extension portion 301, and the positioning rod 3021 also penetrates the The two-axis hole 3020 connects the extension portion 301 with the fixed portion 300 in series. When the extension portion 301 changes position relative to the fixed portion 300, the positioning rod 3021 slides in the two-axis hole 3020; in addition, in one of the shaft holes 3020 A plurality of perforations 3022 are arranged below. When the positioning rod 3021 falls into any perforation 3022, the extension 301 is stuck and cannot be moved. Preferably, one end of the positioning rod 3021 is provided with a stop portion 3023, and the other end has a section of thread 3024 connected to an operating portion 3025. The positioning rod 3021 can be separated from the perforation 3022 by the operating portion 3025 to make The extension 301 can continue to move.

With the movement of the extension portion 301, the wheelbase of the second connecting portion 30 can be extended or contracted, and the curvature of the surface of the seat back 1 can also be changed. Please also refer to Fig. 5 disclosed above. After the curvature of the seat back 1 is changed by the displacement of the second holding mechanism 3, the lower part of the seat back 1 is The bending angle is relatively large, and it may not be able to completely stick to the back of the human body, which may cause insufficient support; however, by using the extension of the length of the second connecting portion 30, the bending angle of the chair back 1 can be reduced, as shown in Fig. 8 It shows that it can fit better on the back of the human body so that it can get proper compensation. Of course, in addition to the second connecting portion 30, the first connecting portion 20 can also be configured with the same structure to change the curvature of the seat back 1, which will not be repeated here.

1‧‧‧Back

300‧‧‧Fixed part

301‧‧‧Extension

3020‧‧‧Axle hole

3021‧‧‧Locating Rod

3022‧‧‧Perforations

31‧‧‧Second Activity Department

Claims (6)

A chair back curvature adjustment device, comprising: a flexible chair back; a bracket supporting the chair back; a first holding mechanism connected between the first position of the chair back and the bracket In between, the first holding mechanism has a first connecting portion and a first movable portion, the first connecting portion is connected to the first position of the seat back, and the first movable portion is sleeved on the bracket to be freely slidable ; A second holding mechanism, the second holding mechanism is connected between the second position of the seat back and the bracket, the second holding mechanism has a second movable portion and a second connecting portion, the second movable The part is sleeved on the bracket to be freely slidable, and the second connecting part consists of a fixed part connected to the second movable part, an extended part connected to the back of the chair, and an extended part connected to the extended part and the fixed part The position of the extension part can be changed relative to the fixed part, and the position can be fixed by the positioning mechanism; and, at least one locking mechanism is used for the first movable part or the second movable part The part is fixed on the bracket; by means of the above, any movable part slides on the bracket to change its height position on the bracket to compress or stretch the back of the chair to change the curvature of the surface. The chair back curvature adjusting device according to claim 1, wherein the positioning mechanism includes a long shaft hole provided on two opposite sides of the fixing part, and a shaft hole penetrating the extension part. The positioning rod also penetrates the two-axis hole to connect the extension part and the fixed part in series. When the extension part changes position relative to the fixed part, the positioning rod slides in the two-axis hole. The chair back curvature adjustment device according to claim 2, wherein a plurality of perforations are arranged below any of the shaft holes, and when the positioning rod falls into any of the perforations, the extension is stuck And can no longer move. The chair back curvature adjusting device according to claim 3, wherein one end of the positioning rod is provided with a stop part, and the other end is connected with an operating part, by which the positioning rod can be detached from the perforation, And so that the extension can continue to move. The chair back curvature adjusting device according to any one of claims 1 to 4, wherein a plurality of positioning holes arranged in an axial direction are distributed on the bracket, and the second movable part has a set of holes to support the second movable The locking mechanism has a fixing bolt that passes through the second movable part and then extends into any positioning hole to interfere with the sliding of the second movable part when locked. The chair back curvature adjustment device according to claim 1, wherein the bracket has a hollow portion, the first movable portion has a guide rod that can extend into the hollow portion of the bracket to move, and the guide rod is fixed by the locking mechanism Relative position in the bracket.

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