JP3203669U - Backrest adjustment device and chair provided with the backrest adjustment device - Google Patents

Abstract

An object of the present invention is to increase the ease of operation and safety of a seat or chair, and to give the user excellent comfort when sitting or lying, and the inclination angle of the backrest according to the actual situation and demand by the user The present invention provides a backrest adjustment device that can appropriately adjust the height of the chair and prevent an unexpected danger such as a user falling down when the chair falls down, and a chair provided with the backrest adjustment device. A first connecting part, a second connecting part, a first connecting part and a second connecting part that connect the first connecting part and the second connecting part. An adjustment mechanism that adjusts the relative angle between the backrest support frame, a backrest support frame having a substantially U-shaped rod, two support rods, and a backrest adjustment device; Is provided. [Selection] Figure 3

Description

  The present invention relates to a chair backrest adjustment device, and more particularly to a backrest adjustment device that can be arbitrarily operated by a user and can adjust the relative angle between the backrest and a seat.

  Conventionally, as shown in FIGS. 1A and 1B, a chair and a seat product are provided with a seat portion and a seat portion in order to reduce the packaging volume, reduce the transportation cost, and provide the user with storage convenience. Generally, a mechanism for folding the backrest or tilting it horizontally is provided.

  According to such a well-known seat product design, the upper half of the backrest and the lower half of the backrest can be freely operated at about 0 to 90 degrees at the center portion of the backrest. In many cases, an adjustment tilt angle mechanism that can be adjusted is installed.

  In such various seat products, there are two parts that can be actuated on one backrest. Therefore, a malfunction of the actuable part is often caused by an erroneous operation by the user. If the degree of malfunction due to such improper use is severe, the seat product may be damaged, or in the worst case, the user may fall down and accidents such as injury or scratches may occur. .

  Therefore, it is expected to research and develop a backrest adjustment device that can improve various accidents and problems as described above, and chairs and seat products containing the same.

  In view of the above circumstances, the present invention has been completed by diligent study and research in order to solve the problems caused by the conventional structure. The present invention provides a backrest adjustment device that allows the user to arbitrarily adjust the inclination angle of the backrest, and can be folded or leveled according to actual circumstances and demands. When a user sits down or lies on a seat or a chair, the user can be provided with excellent comfort, good angle adjustment ease, and high storage convenience, and the user can fall down by the chair falling down. The main object is to provide a highly safe chair and seat product that can prevent the occurrence of unexpected dangers such as falling off the floor.

  In order to achieve the above object, a backrest adjustment device according to an aspect of the present invention includes a first pivotal component, a second pivotal component, a pivot that connects the first pivotal component and the second pivotal component. A connection mechanism and an adjustment mechanism for adjusting a relative angle between the first pivot part and the second pivot part are provided.

  An adjustment mechanism according to another aspect of the present invention includes a main drive member having one end penetrating the second pivot part and one end penetrating the first pivot part and the second pivot part. And a driven member that fixes the angle between the two and the interlocking member that is connected to the other end of the main driving member and the driven member. The main moving member moves in conjunction with the interlocking member, and accordingly, the driven member is moved in the same direction, and the first pivotal component and the second pivotal component penetrating and installing are pulled out, The relative angle between the backrest support frame and the seat frame can be adjusted by rotating the first pivot part relative to the pivot coupling mechanism.

  A seat product such as a chair, a seat portion, an exercise seat product, or a child / child safety seat according to still another aspect of the present invention includes the backrest adjustment device as described above.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings in order to further understand the features and technical contents of the present invention. However, the configurations and the illustrations of the drawings for explaining them are merely preferred embodiments for explaining the present invention, and the scope of protection of the rights of the present invention is not limited strictly to those configurations. .

FIG. 1A is a perspective view showing a conventional sofa with a tilted backrest. FIG. 1B is a perspective view showing a conventional sofa with the backrest lying down horizontally. FIG. 2A shows a combination in which the relative angle between the first pivot part and the second pivot part is 180 degrees and the relative angle between the backrest support frame and the support rod is approximately 90 degrees in the first embodiment of the present invention. It is a perspective view which shows an example. In FIG. 2B, in the first embodiment according to the present invention, the relative angle between the first pivot part and the second pivot part is approximately 90 degrees, and the relative angle between the back support frame and the support rod is approximately 90 degrees. It is a perspective view which shows the example of a combination. FIG. 3 is a side perspective view showing a combination example in which the relative angle between the first pivotal part and the second pivotal part is 180 degrees in the first embodiment of the present invention. FIG. 4 is an exploded perspective view showing the configuration of the backrest adjusting apparatus according to the first embodiment of the present invention. FIG. 5A illustrates a first embodiment of the present invention, in which the latch rod is installed so as to penetrate the second through hole and the third hole portion, and the relative angle between the first pivot part and the second pivot part is It is a perspective view which shows the combination which is 180 degree | times. FIG. 5B shows a first embodiment of the present invention, in which the latch rod is pulled out from the second through hole and the third hole portion, and the relative angle between the first pivot part and the second pivot part is approximately 90 degrees. It is a perspective view which shows a certain combination. FIG. 6 is a perspective view showing a combination example in which the relative angle between the first pivotal part and the second pivotal part is approximately 90 degrees in the second embodiment according to the present invention. FIG. 7 is an exploded perspective view showing the configuration of the backrest adjusting apparatus according to the second embodiment of the present invention. FIG. 8A is a perspective view showing an example in which the latch rod is stopped against the end surface of the first pivotal component in the second embodiment according to the present invention. FIG. 8B is a perspective view showing an example in which the latch rod is pulled out from the third hole portion of the second pivotal component in the second embodiment according to the present invention. FIG. 9A is a perspective view showing an example in which the backrest is inclined in the third embodiment according to the present invention. FIG. 9B is a perspective view showing an example in which the backrest is tilted horizontally in the third embodiment according to the present invention.

  First, a first embodiment according to the present invention will be described with reference to FIGS. 2A, 2B, 3, 4, 5, 5A and 5B. In this first embodiment, a chair provided with a backrest adjustment device according to the present invention is mainly composed of a backrest support frame 10 and a seat frame 20, and the backrest support frame 10 includes a substantially U-shaped rod 11, two A support rod 12 and a backrest adjustment device 13 are provided. The backrest adjusting device 13 can couple the substantially U-shaped rod 11 and the support rod 12 and can adjust the angle between the substantially U-shaped rod 11 and the support rod 12. The seat frame 20 is configured by fixing two substantially U-shaped support frames 21 and 22 so as to face each other, and support bases 23 for fixing and joining the support rods 12 are provided at both ends of the substantially U-shaped support frame 21, respectively. It has been. The backrest adjustment device 13 includes a first pivot part 131, a second pivot part 132, a pivot coupling mechanism 133, and an adjustment mechanism 134. FIG. 2A shows a state in which the first pivot part 131 and the second pivot part 132 have a relative angle of 180 degrees and can be used as a chair. FIG. 2B shows a state where the relative angle between the first pivot part 131 and the second pivot part 132 is approximately 90 degrees, and the seat and the backrest are folded.

  The pivotal coupling mechanism 133 couples the first pivotal part 131 and the second pivotal part 132 rotatably. The pivot coupling mechanism 133 is configured to include a latch 133a and a latch bolt 133b. The second pivotal part 132 has a substantially U-shaped cross section, and the first pivotal part 131 is fitted into the substantially U-shaped cross section of the second pivotal part 132. The latch 133a passes through the first through hole 1311 of the first pivot part 131 and the first hole part 1321 of the second pivot part 132, and the latch bolt 133b is orthogonal to the axial direction of the latch 133a. The latch 133a is fixed by being inserted into the formed hole. Thereby, the pivot coupling mechanism 133 can couple the first pivotal part 131 and the second pivotal part 132 and can also couple the substantially U-shaped rod 11 and the two support rods 12.

  The adjustment mechanism 134 can adjust the relative angle between the first pivot part 131 and the second pivot part 132. The adjustment mechanism 134 is configured to include a main driving member 1341, a driven member 1342, and an interlocking member 1343. One end (left side in the figure) of the main moving member 1341 is installed so as to penetrate the second pivotal part 132, and one end (right side in the figure) of the driven member 1342 is the first pivotal part 131 and the second pivotal part. It is installed so as to penetrate 132, and the angle between the two is fixed. The other ends of the main driving member 1341 and the driven member 1342 are coupled to the interlocking member 1343.

  The main moving member 1341 includes a push button lid 13411, a push button rod 13412, a push button rod sleeve 13413, and a spring 13415. The push button rod 13412 has an outer annular portion 13412a, and one end (the left side in the drawing) penetrates the spring 13415, the second hole portion 1322 of the second pivotal part 132, and the hole 13413a of the push button rod sleeve 13413. And is fitted in the end surface through hole 13431 of the interlocking member 1343. The other end (right side in the figure) of the push button rod 13412 penetrates the sleeve 13413 and is connected to the push button lid 13411. Thereby, the outer annular portion 13412a can stop the spring 13415 in the hole 13413a together with the push button rod sleeve 13413. 5A, the small-diameter outer peripheral portion 13413b of the push button rod sleeve 13413 passes through the second hole 1322 of the second pivotal part 132, and the end surface of the large-diameter outer peripheral portion 13413c is the second pivotal portion. The contact part 132 is fixed in contact with the outer edge of the second hole part 1322.

  The driven member 1342 is configured to include a latch rod 13421 and a latch rod sleeve 13422. As shown in FIG. 4, one end (left side in the figure) of the latch rod 13421 passes through the hole 13422 a of the latch rod sleeve 13422 and is fitted and fixed to the through hole 13432 of the interlocking member 1343. (FIG. 4 illustrates one interlocking member 1343.) The other end (the right side in the figure) of the latch rod 13421 is the second through hole 1312 of the first pivot part 131 and the second pivot part 132. It penetrates through the three holes 1323. Further, as shown in FIG. 5B, the latch rod sleeve 13422 is fixed in contact with the end surface of the third hole portion 1323 of the second pivotal part 132.

  As shown in FIGS. 5A and 5B, when the push button lid 13411 of the adjusting mechanism 134 is pressed, the push button rod 13412 of the main moving member 1341 moves to the left in the drawing. The spring 13415 is compressed by the outer annular portion 13412a and the push button rod sleeve 13413, and the interlocking member 1343 is moved together with the push button rod 13412. Accordingly, the latch rod 13421 can be moved in the same direction, and the latch rod 13421 can be pulled out from the second through hole 1312 of the first pivotal component 131 and the third hole portion 1323 of the second pivotal component 132. In this state, the user can adjust the relative angle between the substantially U-shaped rod 11 and the support rod 12 by applying a force to the approximately U-shaped rod 11.

  As shown in FIG. 5A, the first pivotal part 131 and the second pivotal part 132 (substantially U-shaped rod 11 and two support rods 12) can be horizontally laid down. When the push button lid 13411 is pressed, the latch rod 13421 is interlocked by the interlocking member 1343, and the latch rod 13421 is pulled out from the second through hole 1312 and the third hole portion 1323. Subsequently, the user can adjust the relative angle between the approximately U-shaped rod 11 and the support rod 12 by applying a force to the approximately U-shaped rod 11. For example, as shown in FIG. 5B, the relative angle between the approximately U-shaped rod 11 and the support rod 12 is adjusted to approximately 90 degrees. Therefore, since the chair according to the present invention is very safe, when the user uses the chair, the user simply presses the push button lid 13411 to fold the chair into a desired shape, for example, It can be made into the state which was extended in the state of being flat or planar. Therefore, the backrest adjustment apparatus according to the present invention can provide excellent safety, good comfort, and excellent boxing convenience.

  Next, a second embodiment according to the present invention will be described with reference to FIGS. 2A, 6, 7, 7, 8A, 8B, 9A, and 9B. In the second embodiment, the chair provided with the backrest adjusting device according to the present invention is configured to mainly include the backrest support frame 10 and the seat frame 20. The backrest support frame 10 includes a substantially U-shaped rod 11, two support rods 12, and a backrest adjustment device 13. The backrest adjustment device 13 can couple the substantially U-shaped rod 11 and the support rod 12 and can adjust the angle between the substantially U-shaped rod 11 and the support rod 12. The seat frame 20 is configured by fixing two substantially U-shaped support frames 21 and 22 so as to face each other, and support bases 23 for fixing and supporting the support rods 12 are provided at both ends of the substantially U-shaped support frame 21. ing. The backrest adjustment device 13 includes a first pivot part 131, a second pivot part 132, a pivot coupling mechanism 133, and an adjustment mechanism 134. The first pivot part 131 is provided with an inclination angle regulating tank 1313 instead of the second through hole 1312 in the first embodiment. Further, by providing the inclination angle restriction tank 1313, the angle at which the first pivotal part 131 and the latch rod 13421 cooperate to rotate along the inclination angle restriction tank 1313 can be restricted. Further, the latch rod 13421 can be pulled out simultaneously from the inclination angle regulating tank 1313 of the first pivotal part 131 and the third hole part 1323 of the second pivotal part 132.

  The pivot coupling mechanism 133 includes a pivotable shaft 1331, a first steel sleeve 1332, a steel thin piece spring 1333, a second steel sleeve 1334, and a lever 1335. The pivotable shaft 1331 is installed so as to penetrate the first through hole 1311 of the first pivotal part 131, and has a polygonal structure 1331a (an example of a hexagonal structure is illustrated in FIG. 7) on the outer periphery thereof. ing. The first through hole 1311 of the first pivot part 131 is formed in a polygonal hole (a hexagonal hole is exemplified) correspondingly. Thereby, the first pivot part 131 and the pivotable shaft 1331 can be rotated together. Note that the polygonal structure 1331a and the polygonal hole 1311 are not particularly limited as long as the geometric shape is appropriate, and may be any shape. The pivotable shaft 1331 is provided so as to penetrate the first hole portion 1321, the first steel sleeve 1332, the steel flake spring 1333, and the second steel sleeve 1334 of the second pivotal part 132. The pivotable shaft 1331 is provided with an insertion slot 1331b, and the fixed end 13331 of the steel thin piece spring 1333 is inserted into the insertion slot 1331b to fix the pivotable shaft 1331 and the steel thin piece spring 1333. The lever 1335 is fixed to the fourth hole portion 1324 of the second pivot part 132. Note that the lever 1335 may be directly fixed to the second pivotal part 132 without providing the fourth hole portion 1324. The other end 13332 of the steel thin piece spring 1333 is a stopper end that contacts the lever 1335. Accordingly, the pivotable shaft 1331 includes the first through hole 1311 of the first pivot part 131, the first hole part 1321 of the second pivot part 132, the first steel sleeve 1332, the steel flake spring 1333, and the second steel sleeve. 1334 is provided so as to be able to rotate together with the first pivot part 131. The pivotable shaft 1331 is fitted into the fixed end 13331, and the steel flake spring 1333 rotates with the rotation of the both, so that the steel flute spring 1333 is subsequently brought into the original state of the first pivotal part 131. The elastic force for returning to a sufficient amount is accumulated.

  The adjusting mechanism 134 is provided in one of the first pivotal part 131 and the second pivotal part 132 that are coupled to each other, and the relative relationship between the first pivotal part 131 and the second pivotal part 132 is provided. The angle can be adjusted. The adjustment mechanism 134 is configured to include a main driving member 1341, a driven member 1342, and an interlocking member 1343. One end of the main moving member 1341 is provided so as to penetrate the second pivotal part 132, and one end of the driven member 1342 penetrates the first pivotal part 131 and the second pivotal part 132 to fix the angle between the two. It is provided to let you. The other ends of the main moving member 1341 and the driven member 1342 are fitted and fixed in through holes 13431 and 13432 on the end face of the interlocking member 1343, respectively. When the adjustment mechanism 134 is pressed, as shown in FIGS. 8A and 8B, the main driving member 1341 moves in conjunction with the interlocking member 1343 and moves the driven member 1342 in the same direction, whereby the driven member 1342 is moved to the first direction. The relative angle between the U-shaped rod 11 and the support rod 12 can be adjusted by being pulled out from the pivotal part 131 and the second pivotal part 132.

  The main moving member 1341 includes a push button lid 13411, a push button rod 13412, a push button rod sleeve 13413, and a spring 13415, and the push button rod 13412 includes an outer annular portion 13412a. One end of the push button rod 13412 is provided so as to penetrate the hole 13413a of the push button rod sleeve 13413, and is fitted and fixed to the through hole 13431 of the interlocking member 1343. The other end of the push button rod 13412 is connected to the push button lid 13411. One end of the push button rod 13412 is provided so as to penetrate the hole 13413a of the push button rod sleeve 13413 after penetrating the spring 13415. The spring 13415 is brought into contact with the hole 13413a by the outer annular portion 13412a. The through-hole 1343 on the end surface of the interlocking member 1343 is fitted and fixed. The small-diameter outer peripheral portion 13413b of the push button rod sleeve 13413 is provided so as to penetrate the second hole portion 1322 of the second pivotal part 132, and the end surface of the large outer peripheral portion 13413c is the second hole portion. Abuts against the outer edge of 1322.

  The driven member 1342 includes a latch rod 13421 and a latch rod sleeve 13422, and one end of the latch rod 13421 passes through the hole 13422 a of the latch rod sleeve 13422 and is fitted and fixed to the through hole 13432 of the interlocking member 1343. . (FIG. 7 illustrates one interlocking member 1343.) The other end of the latch rod 13421 is connected to the third hole 1323 of the second pivotal part 132 and the tilt angle regulating tank 1313 of the first pivotal part 131. To penetrate. Further, the latch rod sleeve 13422 is fixed in contact with the end surface of the third hole portion 1323 of the second pivotal part 132.

  8A and 8B, when the latch rod 13421 is pulled out, it is possible to limit the relative angle between the first pivotal part 131 and the second pivotal part 132 by the tilt angle regulating tank 1313. Disappear. Further, since the latch rod 13421 is stopped against the first pivotal part 131 in the axial direction, the latch rod 13421 does not fit into the third hole portion 1323 and there is no restriction on the inclination angle. Generally, at both ends of the tilt angle regulating tank 1313, the angle between the first pivotal part 131 and the second pivotal part 132 is generally designed to be 125 to 145 degrees. For example, according to the present invention, the angle between the first pivot part 131 and the second pivot part 132 can be set to 145 degrees. Therefore, when the push button lid 13411 of the adjusting mechanism is pressed, the push button rod 13412 of the main driving member 1341 is moved, and the spring 13415 is stopped by the outer annular portion 13412a against the hole 13413a inside the push button rod sleeve 13413. . Further, when the push button lid 13411 is pressed, the push button rod 13412, the interlocking member 1343, and the latch rod 13421 are further moved in the same direction, and the latch rod 13421 is moved to the tilt angle regulating tank 1313 of the one pivotal part 131 and the second pivot. The third hole portion 1323 of the contact part 132 can be pulled out. At that time, the user can adjust the relative angle between the substantially U-shaped rod 11 and the support rod 12 by applying a force to the approximately U-shaped rod 11. Further, the pivotable shaft 13421 is stopped in its axial direction by the first pivot part 131, and the first pivot part 131 is hit against the bottom end of the second pivot part 132, thereby fixing them. can do.

  That is, as shown in FIGS. 8A and 8B, the backrest support frame 10 and the seat frame 20 have a predetermined inclination angle (see FIGS. 9A and 9B). When the push button lid 13411 is pressed, the latch rod 13421 is interlocked by the interlocking member 1343, and the latch rod 13421 is pulled out from the tilt angle regulating tank 1313 and the third hole portion 1323. Thereafter, by applying a force to the substantially U-shaped rod 11 of the back support frame 10 and adjusting the relative angle between the back support frame 10 and the seat frame 20, the back support frame 10 and the seat frame 20 are tilted horizontally. be able to. Since the chair according to the present invention is excellent in safety, when the user uses the chair, the chair is folded into a desired shape, for example, simply by pressing the push button lid 13411. It can be in a state or a state expanded in a planar shape. Therefore, the backrest adjustment apparatus according to the present invention can provide excellent safety, good comfort, and excellent boxing convenience.

  A third embodiment according to the present invention will be described with reference to FIGS. 9A and 9B. As shown in FIGS. 9A and 9B, in the main driving member 13411, an adjustment handle 1344 and a connecting member 1345 can be further provided on the interlocking member 1343. When the back support frame 10 and the seat frame 20 are placed in a horizontal state, the push button lid 13411 is pressed, the handle 1344 is flipped, and the connecting member 1345 is adjusted or operated, whereby the back support frame 10 and the seat frame. The angle with 20 can be adjusted. When the angle between the back support frame 10 and the seat frame 20 is adjusted within the range of 90 to 145 degrees, the latch rod 13421 automatically fits into the third hole portion 1323, so that the first pivoting part 131 can be activated. This range is restricted within the inclination angle restriction tank 1313 due to the restriction of the latch rod 13421, so that the inclination angle between the backrest support frame 10 and the seat frame 20 can be limited to a range of 90 to 145 degrees ( (See FIG. 4). When the user stores the chair according to the present invention in a horizontal state, the connecting member 1345 can be adjusted or operated by pressing the push button lid 13411 and flipping the handle 1344. Furthermore, the latch rod 13421 can be pulled out from the third hole portion 1323 by adjusting the inclination angle between the backrest support frame 10 and the seat frame 20. Accordingly, the first pivotal part 131 is not limited by the latch rod 13421, and the backrest support frame 10 and the seat frame 20 can freely operate within an inclination angle range of 90 to 180 degrees. The chair according to the present invention can be accommodated under a horizontal state where the angle is 180 degrees. Therefore, according to this invention, the effect which improves the storage convenience can be exhibited.

  In summary, the first pivot part, the second pivot part, the pivot coupling mechanism coupling the first pivot part and the second pivot part, and the first pivot part and the second pivot part. In the backrest adjustment device according to the present invention, which is configured to include an adjustment mechanism that adjusts the relative angle between the pushbutton and the pushbutton that adjusts and changes the angle between the backrest and the seat by pressing by the user. Therefore, the user can proceed with the operation accurately without causing a malfunction. In addition, it is very easy for the user to adjust the inclination angle of the backrest, and the chair can be easily folded or leveled. Therefore, according to the backrest adjustment device according to the present invention, it provides superior effects such as excellent operational safety, excellent angle adjustment operation ease, good storage convenience, etc., as well as a chair, seat part, exercise seat product or It can be applied to industries that manufacture various seat products such as safety seats for children and young people.

  In addition, in various seat products such as a chair, a seat portion, an exercise seat product or a safety seat for children and young people having the back adjustment device according to the present invention, as described above, excellent operational safety, In addition to maintaining various advantageous effects such as excellent angle adjustment ease of operation and good storage convenience, it is possible to support safety, comfort when sitting and lying down, and convenience of packaging.

  Although the above description has described the preferred embodiments of the present invention, the configurations and drawings illustrated in those embodiments are merely examples for explaining the present invention, and are intended to protect the rights of the present invention. The scope is not narrowly limited to only those configurations.

1 backrest
2 Seat part 3 Push button 10 Back support frame 11 Substantially U-shaped rod 12 Support rod 13 Backrest adjustment device 131 First pivot part 1311 First through hole 1312 Second through hole 1313 Inclination angle regulating tank 132 Second pivot part 1321 1st hole part 1322 2nd hole part 1323 3rd hole part 1324 4th hole part 133 Pivot coupling mechanism 133a Latch 133b Latch bolt 1331 Pivotable shaft 1331a Polygon structure 1331b Insertion slot 1332 1st steel sleeve 1333 Steel thin piece spring 13331 Fixed end 13332 Stopping end 1334 Second steel sleeve 1335 Lever 134 Adjustment mechanism 1341 Main moving member 13411 Push button lid 13412 Push button rod 13412a Outer annular part 13413 Push button Sleeve 13413a hole 13413b small-diameter outer periphery 13413c large-diameter outer periphery 13415 spring 1342 driven member 13421 latch rod 13422 latch rod sleeve 13422a hole 1343 interlocking member 13431 through hole 13432 through hole 1344 adjusting handle 1345 connecting member 20 seat frame 21 U-shaped support frame 22 Substantially U-shaped support frame 23 Support base

Claims (14)

A chair backrest adjustment device comprising a first pivotal part, a second pivotal part, a pivotal coupling mechanism and an adjustment mechanism,
The pivot connection mechanism connects the first pivot part and the second pivot part, and adjusts the relative angle between the first pivot part and the second pivot part. Adjustment device. The adjustment mechanism includes a main driving member, a driven member, and an interlocking member,
One end of the main driving member is provided so as to penetrate the second pivotal part,
One end of the driven member is provided so as to penetrate the first pivotal part and the second pivotal part, and has a function of fixing an angle between the two.
The backrest adjustment device according to claim 1, wherein the other end of the main moving member and the other end of the driven member are coupled to the interlocking member. The main driving member includes a push button lid, a push button rod, a push button rod sleeve, and a spring,
The push button rod includes an outer annular portion, one end of which is coupled to the interlock member through the hole of the push button rod sleeve, the other end is coupled to the push button lid, and the one end is the spring. Through the hole of the push button rod sleeve, and the outer annular portion stops the spring against the hole and is coupled to the end surface of the interlocking member,
The push button rod sleeve is characterized in that a small-diameter outer peripheral portion penetrates the second pivotal part, and a large-diameter outer peripheral end face abuts an outer edge of the second pivotal part. The backrest adjustment device according to claim 2. The driven member comprises a latch rod and a latch rod sleeve;
One end of the latch rod penetrates the hole of the latch rod sleeve and is coupled to the interlocking member, and the other end penetrates the first pivot part and the second pivot part,
The backrest adjustment device according to claim 3, wherein the latch rod sleeve penetrates the second pivot part and abuts on an end surface of the second pivot part.   The backrest adjustment device according to claim 4, wherein the interlocking member is an interlocking part.   The backrest adjustment apparatus according to any one of claims 1 to 5, wherein the pivot coupling mechanism includes a latch and a latch bolt. The pivot coupling mechanism comprises a pivotable shaft and a steel flake spring;
The pivotable shaft is provided to pass through the first pivot part and to rotate with the first pivot part, and to the second pivot part and the steel. The backrest adjustment device according to any one of claims 1 to 5, wherein the backrest adjustment device is provided so as to penetrate the flaky spring. An insertion slot is opened in the pivotable shaft,
8. The backrest adjustment device according to claim 7, wherein one end of the steel flake spring is a fixed end that is fitted in the insertion slot and fixes the pivotable shaft. The pivot coupling mechanism further includes a lever fixedly installed on the second pivot part.
The backrest adjustment device according to claim 8, wherein a contact end for stopping the lever is provided at the other end of the steel thin piece spring. The pivotable shaft has a polygonal structure;
The first pivot part has a polygonal hole formed corresponding to the polygon structure so as to rotate the pivotable shaft and the first pivot part together. The backrest adjustment device according to claim 7.   The first pivot part is further provided with a tilt angle regulating tank, thereby limiting the angle at which the first pivot part and the latch rod rotate together along the tilt angle regulating tank, and 5. The backrest adjustment device according to claim 4, wherein when the latch rod is pulled out, the backrest adjusting device is pulled out together from the tilt angle regulating tank of the first pivotal part and the second pivotal part.   The backrest adjustment device according to claim 2, wherein the main moving member is a push button lid.   The backrest adjustment device according to claim 2, wherein the main driving member further includes an adjustment handle and a connecting part. A chair comprising a back support frame and a seat frame,
The backrest support frame includes a substantially U-shaped rod, two support rods, and the backrest adjusting device according to any one of claims 1 to 14, wherein the backrest adjusting device is the substantially U-shaped. While connecting the rod and the support rod, the angle between the substantially U-shaped rod and the support rod can be adjusted,
The seat frame is configured by fixing and joining two substantially U-shaped support frames so as to oppose each other, and a support pedestal for fixing the support rod is provided at each end of the substantially U-shaped support frame. A chair characterized by that.