CN218852287U - Chair with adjustable chair back - Google Patents

Abstract

The utility model relates to an adjustable seat of back of chair belongs to field seat technical field, and the problem to realize the automatically regulated of the back of the chair, adopt technical scheme as follows: the chair comprises a seat, wherein the seat is configured to be a mounting cushion, the lower end of the seat is connected with a seat supporting component, and the rear end of the seat is connected with a chair back support; a cantilever is further arranged between the four-bar linkage mechanism and the chair back support, the lower end of the cantilever is hinged with the four-bar linkage mechanism, and the upper end of the cantilever is rotatably connected to the chair back support; the sliding block is connected to the chair back bracket in a sliding manner, and a locking device is arranged between the sliding block and the chair back bracket; the chair back adjustable seat has an initial state and a back-chasing state, the torsion spring is arranged at any joint of the four-bar mechanism, and acts on the upper connecting rod or the lower connecting rod to enable the four-bar mechanism to have a forward rotating trend.

Description

Chair with adjustable chair back

Technical Field

The utility model relates to the technical field of seats, in particular to adjustable seat of back of the chair.

Background

The chair is an essential article for modern life, is widely applied to various companies, families and other public places, and the comfort degree of the chair directly relates to the working and life quality of people. Many seats all are fixed size batch production on the market at present, the distance of back of the chair and seat support is all fixed, but the user is not fixed, user's age, the difference such as stature is great, the seat of fixed size batch production manufacturing, hardly satisfy all user's requirement, consequently, have some users and break away from human waist back of the body at the seat back of the chair when using, direct formation space leads to the seat back of the chair to lose the support to human waist, human backbone can not effectively be supported, sit for a long time and lead to a great deal of health problem easily.

In order to solve the above problems, those skilled in the art have developed a backrest structure and a seat with patent application No. CN 217524375U, which includes a main body, a frame, a connecting portion and a cushion; the frame is connected with the main body through the connecting part, the connecting part has elasticity, and the connecting part can be telescopically deformed relative to the main body; the back cushion is arranged on the frame. When the connecting part is pressed, the frame can be driven to be automatically adjusted according to the pressure of a user on the connecting part. However, the seat is not capable of generating enough pressure to bring the frame to adjust automatically if the user is light.

Disclosure of Invention

The problem to prior art, the utility model provides an adjustable seat of back of the chair, through the locking device who sets up four-bar linkage and four-bar linkage between the back of the chair and back of the chair support, set up the torsional spring in four-bar linkage, press the torsional spring during installation and form pretension elasticity, lock four-bar linkage through locking device again, after the user sits, open locking device, under the effect of torsional spring reset force, the back of the chair stretches forward and realizes following back the action, even the weight of user is lighter also can realize the automatically regulated to the back of the chair.

The utility model adopts the technical scheme as follows:

a chair with an adjustable chair back comprises a chair seat, a four-bar mechanism, a sliding block, an upper connecting bar, a lower connecting bar and a chair back mounting seat, wherein the chair seat is configured to be a mounting cushion; a cantilever is further arranged between the four-bar linkage mechanism and the chair back support, the lower end of the cantilever is hinged with the four-bar linkage mechanism, and the upper end of the cantilever is rotatably connected to the chair back support; the sliding block is connected to the chair back bracket in a sliding manner, and a locking device is arranged between the sliding block and the chair back bracket; the chair back adjustable seat has an initial state and a back-chasing state, the torsion spring is arranged at any joint of the four-bar linkage mechanism, and acts on the upper connecting bar or the lower connecting bar to enable the four-bar linkage mechanism to have a forward rotating trend; in an initial state, the locking device is in a closed state, the sliding block and the chair back bracket are kept relatively fixed, the upper end of the cantilever is far away from the sliding block, the chair back mounting seat is in a backward position, and the torsion spring deforms to generate elasticity; when the locking device is opened, the elasticity of the torsion spring drives the four-bar mechanism to rotate forwards, the chair back is converted from the initial state to the back-tracing state, the upper end of the cantilever is close to the sliding block, and the chair back mounting seat is in the front position.

The backrest has the advantages that the backrest pursuing function can be controlled to be opened or closed according to the needs of a user, for example, when the backrest pursuing function is not needed, the position of the four-bar linkage mechanism is fixed through the locking device to form an initial state, and the backrest is at a rear position; when the back-chasing function is needed, namely the locking device is opened, the chair back mounting seat extends forwards to form a back-chasing state under the action of the reset force of the torsion spring, and the back is very easy to be jacked to support by the chair back after a human body sits on the chair.

Furthermore, the lower end of the cantilever is hinged with the four-bar linkage mechanism, namely: the lower end of the cantilever is hinged with the upper connecting rod or the lower connecting rod. The cantilever reversely provides a supporting force for the four-bar mechanism, the movement of the four-bar mechanism is not influenced, and the lower end of the cantilever can be hinged with the upper connecting bar or the lower connecting bar to play the same role.

Furthermore, the lower end of the cantilever is hinged with the upper connecting rod; the lower end of the cantilever is spherical, a concave hole matched with the upper connecting rod is arranged in the middle of the upper connecting rod, and the lower end of the cantilever is hinged in the concave hole. Such an arrangement may prevent the hinged connection of the cantilever arm to the upper link from being pinched to an object or person.

Furthermore, two ends of the upper connecting rod are respectively hinged with the upper end of the sliding block and the upper end of the chair back mounting seat, and two ends of the lower connecting rod are respectively hinged with the lower end of the sliding block and the lower end of the chair back mounting seat to form a four-bar mechanism.

The four-bar mechanism can rotate relatively at the movable joint, and when the chair back installation seat positioned at the front side rotates relatively to move, the chair back installation seat keeps horizontal and vertical stretching or retracting action, so that the chair back can not deflect at an angle, and can be tightly attached to the waist and the back of a human body.

Furthermore, the upper connecting rod is a U-shaped body which is arranged in a U shape, and the open end of the U-shaped body faces downwards. The lower connecting rod is positioned in the space surrounded by the U-shaped body. The torsion spring is sleeved on a hinged shaft at the upper ends of the upper connecting rod and the sliding block, one elastic arm of the torsion spring is arranged on the bottom edge inside the U-shaped body of the upper connecting rod in a lap mode, and the other elastic arm of the torsion spring is arranged on the upper surface of the lower connecting rod in a lap mode.

The upper connecting rod is arranged in a U shape, and the lower connecting rod is hidden in the U-shaped body of the upper connecting rod, so that when the upper connecting rod and the lower connecting rod move, a gap is not generated in the middle, foreign objects are not clamped between the upper connecting rod and the lower connecting rod, and the use is safer. The torsional spring penetrates through the hinged shaft at the upper end of the upper connecting rod and the upper end of the sliding block and then is pressed between the upper connecting rod and the lower connecting rod to generate reset force, when the locking device is opened, the sliding block can slide per se, the torsional spring props the upper connecting rod and the lower connecting rod open under the action of the reset force, the sliding block slides upwards, and the chair back mounting seat extends forwards until the chair back mounting seat is abutted against the waist and back of a human body to form a back-chasing state.

More preferably, the sliding block is slidably connected to the backrest support by: the chair back support comprises an embedded frame and a connecting frame, a door-shaped hole for the sliding block to slide up and down is longitudinally arranged on the connecting frame, and the door-shaped hole is communicated front and back. The slider both sides are equipped with the lug, inlay between frame and the link be equipped with lug complex spout, the spout is located the both sides in door shape hole, inlay frame and link with the lug clamp in the spout after, inlay the frame and pass through the connecting piece and link fixed linking to each other. The convex block slides in the sliding groove, so that the sliding block is connected to the chair back support in a sliding mode.

The chair back support is divided into an embedded frame and a connecting frame which are detachably connected, the sliding block is positioned in the door-shaped hole, the two sides of the sliding block are provided with convex blocks, a sliding groove is formed between the embedded frame and the connecting frame, the convex blocks are clamped in the sliding groove, the sliding block can freely slide in the sliding groove, and the sliding block is arranged on the chair back support through the arrangement.

Furthermore, the locking device means that the sliding block comprises a panel, two sides of the panel extend forwards to form side plates, the lower end of the panel extends to form a bottom plate, a knob is arranged on the panel, the knob penetrates through the panel to be connected with an oval block, and two ends of the oval block outwards abut against the abutting pieces on the two sides respectively; the abutting piece consists of a head end and a main body, the main body is provided with a through hole, a circle of convex ribs extend into the main body, the head end seals the abutting end of the abutting piece, and the tail end of the abutting piece is opened; the abutting piece is sequentially provided with a first spring and a bolt from the inner horizontal surface to the outer side, one end of the first spring abuts against the inner wall of the head end of the abutting piece, and the other end of the first spring extends into the bolt; one end of the bolt is provided with a boss, after the other end of the bolt passes through a hole in the center of the convex edge, the boss abuts against the convex edge, the second spring is sleeved in the boss, one end of the second spring abuts against the convex edge, the other end of the second spring abuts against a side plate of the sliding block, and an avoidance hole for the bolt to pass in and out is formed in the side plate; a transverse partition plate is arranged on the inner side of the panel, a channel for the abutting piece to slide is formed between the transverse partition plate and the bottom plate, and two rows of jacks are respectively arranged on two sides of the portal hole on the connecting frame; rotating the knob to enable the long shaft end of the oval block connected with the knob to be in a horizontal position, pushing the abutting piece outwards by the oval block to drive the first spring to be in a compressed state and push the plug pin into the jack, enabling the second spring to be in a compressed state, and enabling the locking device to be in a closed state at the moment; and then the knob is rotated to enable the short shaft end of the oval block connected with the knob to be in a horizontal position, a gap is formed between the oval block and the abutting piece, the abutting piece and the first spring move inwards under the action of the reset force of the second spring to drive the bolt to retract and separate from the jack, and the locking device is in an open state at the moment.

The first spring is arranged in the abutting piece, when the knob is rotated, the first spring gives a rebounding force to the bolt, and the situation that the bolt is not clamped due to the fact that the bolt is not aligned with the jack when the bolt is ejected out is avoided. The second spring is used for giving a resilience force to retract the bolt to be separated from the jack, and the two springs are matched with each other to enable the bolt to be ejected and rebounded more smoothly. A channel is formed between the transverse partition plate on the inner side of the panel and the bottom plate, and the longitudinal position of the leaning piece is fixed, so that after the bolt is inserted into the jack, the slide block and the chair back support can be fixed in position, the relative position of the four-bar mechanism is fixed, the four-bar mechanism is not linked, and the position of the chair back is fixed.

The utility model discloses beneficial effect who has:

1. a four-bar mechanism is arranged between the chair back bracket and the chair back, a locking device is arranged on the four-bar mechanism, a torsion spring is arranged at the joint of the four-bar mechanism, the torsion spring is pressed to form pre-tightening elasticity during installation, and the four-bar mechanism is locked into an initial state after the chair back is leaned by the locking device; when the user sits on the utility model discloses behind the seat, open locking device, under the drive of torsional spring restoring force, the four-bar linkage motion drives the back of the chair and stretches forward, until contacting user's back to provide the holding power to the back of the waist. The reset force of the torsion spring is used as the driving force of the back-tracing action, and the back-tracing effect of the chair back is not affected even if the weight of a user is light.

2. The lower end of the cantilever is arranged in a spherical shape, a concave hole is formed in the corresponding position of the upper connecting rod, and the lower end of the cantilever is hinged in the concave hole of the upper connecting rod, so that a human body or clothes can be prevented from being clamped at the hinged position.

3. Set up the knob on the slider, the knob passes the slider and connects oval piece, oval piece butt piece, and the butt end of butt piece is sealed, and other end opening, from blind end to open end, first spring, bolt are installed in proper order to the butt piece. A convex edge is arranged in the abutting piece and abuts against a boss on the bolt, the bolt penetrates out of a central hole of the convex edge and then is sleeved with a second spring, and the tail end of the second spring abuts against the side plate. The first spring is arranged in the abutting piece, when the knob is rotated, the first spring gives a rebounding force to the bolt, and the condition that the bolt is not clamped because the bolt is not aligned with the jack when the bolt is ejected is avoided; when the knob is rotated, the second spring gives the bolt a resilience force which retracts to be separated from the jack, and the two springs are matched with each other to ensure that the bolt is ejected and rebounded more smoothly. A channel is formed between the transverse partition plate on the inner side of the panel and the bottom plate, and the longitudinal position of the leaning piece is fixed, so that the sliding block and the chair back support can be fixed after the bolt is inserted into the jack.

Drawings

Fig. 1 is a schematic perspective view of an adjustable chair back according to an embodiment of the present invention;

fig. 2 is an exploded view of an embodiment of the adjustable back seat of the present invention;

fig. 3 is a schematic diagram of a split structure of a four-bar linkage mechanism according to an embodiment of the present invention;

fig. 4 is a schematic structural view of an embodiment of the present invention, wherein the chair back adjustable seat is in an initial state;

fig. 5 is a schematic structural view of an embodiment of the present invention, wherein the seat back is adjustable;

FIG. 6 is a partial cross-sectional view of a locking device of an adjustable back rest seat according to an embodiment of the present invention;

fig. 7 is a schematic view of a disassembled structure of a backrest bracket of an adjustable backrest seat according to an embodiment of the present invention;

fig. 8 is a schematic view of the detached structure of the cantilever and the upper connecting rod according to the embodiment of the present invention;

fig. 9 is a schematic view of a disassembled structure of a locking device in an embodiment of the present invention;

fig. 10 is a schematic structural diagram of the locking device when the locking device is unlocked according to the embodiment of the present invention.

The symbols in the figures are as follows:

1. a chair seat; 2. a cushion; 3. a seat support assembly; 4. a chair back bracket; 5. a slider; 6. an upper connecting rod; 7. a lower connecting rod; 8. a chair back mounting seat; 9. a chair back; 10. a cantilever; 11. a locking device; 12. a torsion spring; 13. embedding a frame; 14. a connecting frame; 15. a bump; 16. a panel; 17. a side plate; 18. a base plate; 19. a knob; 20. an oval block; 21. an abutting member; 22. a first spring; 23. a bolt; 24. a boss; 25. a second spring; 26. a diaphragm plate; 27. a jack; 28. a chute; 29. a head end; 30. a main body; 31. buckling; 32. mounting holes; 33. and (7) a rib.

Detailed Description

The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the embodiment, other embodiments obtained by those skilled in the art without any creative work belong to the protection scope of the present invention.

In the description of the present invention, the term "at least one" means one or more unless explicitly defined otherwise. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The utility model discloses a specific embodiment as follows:

as shown in fig. 1-10, the utility model provides a chair with adjustable back, which comprises a chair seat 1, a cushion 2 arranged on the chair seat 1, a seat supporting component 3 fixedly connected with the lower end of the chair seat 1 and used for supporting the chair, and a back support 4 fixedly connected with the rear end of the chair seat 1. As shown in fig. 2,3, the seat back bracket 4 is further connected with a slide block 5, and the slide block 5 is slidably connected with the seat back bracket 4 and can slide at the upper and lower positions of the seat back bracket 4. The upper end and the lower end of the sliding block 5 are provided with hinged joints, the upper end of the sliding block 5 is hinged with the lower end of the upper connecting rod 6, and the lower end of the sliding block 5 is hinged with the lower end of the lower connecting rod 7. The upper end of the upper connecting rod 6 is hinged with the upper end of the chair back mounting seat 8, and the upper end of the lower connecting rod 7 is hinged with the lower end of the chair back mounting seat 8. The slide block 5, the upper connecting rod 6, the lower connecting rod 7 and the chair back mounting seat 8 form a four-bar mechanism, and the chair back 9 is mounted on the chair back mounting seat 8. The four-bar mechanism can rotate relatively at the movable joint, and when the chair back installation seat 8 positioned at the front side rotates relatively to move, the chair back installation seat 8 keeps horizontal and vertical extension or retraction, so that the chair back 9 can not deflect at an angle and can be tightly attached to the waist and the back of a human body.

A cantilever 10 is arranged on the chair back support 4, the upper end of the cantilever 10 is rotatably connected with the chair back support 4, the lower end of the cantilever 10 is hinged with the upper connecting rod 6 or the lower connecting rod 7, the effect is the same whether the cantilever is hinged with the upper connecting rod 6 or the lower connecting rod 7, and the cantilever 10 reversely provides supporting force for the four-bar mechanism. The cantilever 10 is rotatably connected with the chair back bracket 4 and then is hinged with the upper connecting rod 6 or the lower connecting rod 7, so that the linkage of the four-bar linkage is not influenced while the supporting force of the four-bar linkage is provided.

As shown in fig. 2-5, a locking device 11 is arranged between the slider 5 and the backrest support 4, the adjustable chair back of the utility model has an initial state and a back-tracking state, a torsion spring 12 can be installed at any joint of the four-bar linkage, and the torsion spring 12 acts on the upper link 6 or the lower link 7 and makes the four-bar linkage have a tendency of forward rotation; in an initial state, the locking device 11 is in a closed state, the sliding block 5 and the chair back bracket 4 are relatively fixed, the upper end of the cantilever 10 is far away from the sliding block 5, the chair back mounting seat 8 is in a backward position, and the torsion spring 12 deforms to generate elasticity; when the locking device 11 is opened, the elasticity of the torsion spring 12 drives the four-bar linkage to rotate forwards, the chair back 9 is switched from the initial state to the back-tracking state, the upper end of the cantilever 10 is close to the slider 5, and the chair back mounting seat 8 is in the front position.

The suspension arm 10 and the four-bar mechanism are arranged between the chair back 9 and the chair back bracket 4, the torsion spring 12 is arranged in the four-bar mechanism, the torsion spring 12 is hidden in the four-bar mechanism, and does not occupy extra space, so that the appearance is more attractive and concise, the torsion spring 12 is pressed to form pre-tightening elasticity during installation, the pre-tightening elasticity generated by the torsion spring 12 also becomes driving force for driving the four-bar mechanism to rotate to be pushed forward, and the locking device 11 has the significance that the back-tracking function can be controlled to be opened or closed according to the needs of a user, for example, when the back-tracking function is not needed, the position of the four-bar mechanism is fixed by the locking device 11 to form an initial state, and the chair back 9 is at the back position; when the back chasing function is needed, namely the locking device 11 is opened, the chair back mounting seat 8 extends forwards to form a back chasing state under the action of the reset force of the torsion spring 12, and the back is easily jacked and supported by the chair back 9 after a human body sits.

More preferably, as shown in fig. 8, the lower end of the cantilever 10 is hinged to the upper connecting rod 6, the lower end of the cantilever 10 is spherical, a concave hole is formed in the middle of the upper connecting rod 6, and the spherical lower end of the cantilever 10 is hinged to the concave hole of the upper connecting rod 6, so that the hinged point can be prevented from clamping a human body or an article, and the use is safer.

More preferably, as shown in fig. 2-5, in this embodiment, the torsion spring 12 is inserted through the hinge shaft of the upper link 6 and the slider 5, the upper link 6 is a U-shaped body with an open end facing downward, the lower link is located in the space surrounded by the U-shaped body, one elastic arm of the torsion spring 12 is overlapped on the bottom edge inside the U-shaped body of the upper link 6, and the other elastic arm of the torsion spring 12 is overlapped on the upper surface of the lower link 7. When the torsion spring 12 is assembled, the torsion spring penetrates through the hinge shaft at the upper ends of the upper connecting rod 6 and the sliding block 5 and then is pressed between the upper connecting rod 6 and the lower connecting rod 7 to generate a reset force, after the locking device 11 is opened, the sliding block 5 can freely slide, the torsion spring 12 props open the upper connecting rod 6 and the lower connecting rod 7 under the action of the reset force, the sliding block 5 slides upwards, and the chair back mounting seat 8 is stretched forwards until the chair back mounting seat is propped against the waist and the back of a human body to form a back-tracing state.

The upper connecting rod 6 is arranged in a U shape, and the lower connecting rod 7 is hidden in the U-shaped body of the upper connecting rod 6, so that no gap is generated between the upper connecting rod 6 and the lower connecting rod 7 when the upper connecting rod 6 and the lower connecting rod 7 move, foreign objects cannot be clamped between the upper connecting rod 6 and the lower connecting rod 7, and the use is safer.

In a more preferable scheme, as shown in fig. 6-7, the seat back support 4 comprises an embedded frame 13 and a connecting frame 14, a door-shaped hole for the sliding block 5 to slide up and down is longitudinally arranged on the connecting frame 14, and the door-shaped hole is communicated front and back. The two sides of the sliding block 5 are provided with convex blocks 15, sliding grooves 28 matched with the convex blocks 15 are arranged between the embedded frame 13 and the connecting frame 14, the sliding grooves 28 are positioned on the two sides of the door-shaped hole, and after the embedded frame 13 and the connecting frame 14 clamp the convex blocks 15 in the sliding grooves 28, the embedded frame 13 is fixedly connected with the connecting frame 14 through fixed connecting pieces such as screws or bolts. The cam 15 slides in the sliding groove 28, so that the sliding block 5 is slidably connected to the seat back bracket 4. The chair back support 4 is divided into an embedded frame 13 and a connecting frame 14 which are detachably connected, the sliding block 5 is arranged in a door-shaped hole, the two sides of the sliding block 5 are provided with convex blocks 15, a sliding groove 28 is formed between the embedded frame 13 and the connecting frame 14, the convex blocks 15 are clamped in the sliding groove 28, the sliding block 5 can freely slide in the sliding groove 28, and the sliding block 5 is arranged on the chair back support 4 through the arrangement.

In a more preferable embodiment, as shown in fig. 7-10, the locking device 11 means that the sliding block 5 includes a panel 16, two sides of the panel 16 extend forward to form side plates 17, a bottom plate 18 extends from a lower end of the panel 16, a knob 19 is disposed on the panel 16, the knob 19 penetrates through the panel 16 to be connected with an oval block 20, and two ends of the oval block 20 outwards abut against the abutting pieces 21 on the two sides respectively. The abutting member 21 is composed of a head end 29 and a main body 30, the main body 30 is provided with a through hole, a circle of convex ribs 33 extend in the main body 30, the head end 29 closes the abutting end of the abutting member 21, and the tail end of the abutting member 21 is opened.

The abutting piece 21 is provided with a first spring 22 and a bolt 23 in sequence from the inner level to the outer side, one end of the first spring 22 abuts against the inner wall of the head end 29 of the abutting piece 21, and the other end of the first spring 33 extends into the bolt 23. One end of the bolt 23 is provided with a boss 24, after the other end of the bolt 23 passes through a hole in the center of the convex rib 33, the boss 24 abuts against the convex rib 33, the second spring 25 is sleeved in the boss, one end of the second spring 25 abuts against the convex rib 33, the other end of the second spring 25 abuts against the side plate 17 of the sliding block 5, and the side plate 17 is provided with a avoiding hole for the bolt 23 to go in and out. The inner side of the panel 16 is provided with a diaphragm 26, a channel for the abutting piece 21 to slide is formed between the diaphragm 26 and the bottom plate 18, and two sides of the door-shaped hole on the connecting frame 14 are respectively provided with a row of insertion holes 27.

As shown in fig. 10, the head 29 is a sheet with a buckle 31, and the body 30 is a square body with a through hole, and one end of the body is provided with a mounting hole 32 for matching with the buckle 31. During assembly, the bolt 23 penetrates into the main body, the boss 24 abuts against the convex rib 33, a hole is formed in the end portion of the bolt 23 with the boss 24, one end of the first spring 22 is inserted into the hole of the bolt 23, the first spring 22 is pressed, the buckle 31 on the head end 29 is inserted into the mounting hole 32 on the main body 30, one end of the abutting piece 21 is closed by the head end 29 to form an abutting end, the second spring 25 is sleeved on the other end of the bolt 23, the second spring 25 abuts against the side plate 17, and the bolt 23 penetrates into the avoiding hole in the side plate 17.

When the locking device 11 is used, the knob 19 is turned, as shown in fig. 9, the long axis end of the oval block 20 connected with the knob 19 is in a horizontal position, the oval block 20 pushes the abutting piece 21 outwards, the first spring 22 is driven to be in a compressed state and the bolt 23 is pushed into the inserting hole 27, the second spring 25 is also in a compressed state, the locking device 11 is in a closed state, and the sliding block 5 is fixed on the chair back bracket 4. Turning the knob 19, as shown in fig. 10, the short axis end of the oval block 20 connected to the knob 19 is in a horizontal position, and a gap is formed between the oval block 20 and the abutting member 21, and under the action of the restoring force of the second spring 25, the abutting member 21 and the first spring 22 move inwards, and the bolt 23 is driven to retract and disengage from the insertion hole 27, and at this time, the locking device 11 is in an open state, and the slider can slide freely on the seat back bracket 4.

The first spring 22 is mounted inside the abutment 21, and when the knob 19 is turned, the first spring 22 gives a resilient force to the latch 23, ensuring that the latch 23 is ejected without jamming due to misalignment with the receptacle 27. The second spring 25 is then to give the latch 23 a force to retract out of the socket 27, and the cooperation of the first spring 22 and the second spring 25 allows for smoother ejection and recoil of the latch 23. A channel is formed between the diaphragm plate 26 on the inner side of the panel 16 and the bottom plate 18, the longitudinal position of the abutting piece 21 is fixed, after the bolt 23 is inserted into the insertion hole 27, the slide block 5 and the chair back support 4 can be fixed, the relative position of the four-bar mechanism is fixed, the four-bar mechanism is not linked, and the position of the chair back 9 is fixed.

The utility model discloses the concrete use of the adjustable seat of the back of the chair does: as shown in fig. 2-10, when the back of the chair back 9 is not needed to be backed up, the bolt 23 is inserted into the insertion hole 27 by rotating the knob 19, at this time, the adjustable chair seat of the chair back of the utility model is in an initial state, the position of the four-bar mechanism is fixed, and the chair back 9 does not move any more. When the user is sitting in the embodiment of the utility model provides an adjustable seat of back of the chair, rotating knob 19 is deviate from bolt 23 from jack 27, and four-bar linkage can the free motion, and four-bar linkage stretches forward under torsional spring 19's effort, and until back of the chair 9 pushes up user's waist back, back of the chair 9 motionless after the power that the back of the chair 9 stretched forward reaches balance with user's leaning force. At this moment, the utility model discloses adjustable seat support of the back of the chair is for following up the back state, and when user's position of sitting changed, the back of the chair 9 atress balance was broken, and the back of the chair 9 stretches out again really to reaching new atress balance, the utility model discloses adjustable seat of the back of the chair can be according to the position of the adjustable back of the chair 9 of user's position of sitting self-adaptation. When the user does not need to adjust the back-chasing function of the chair back 9, the knob 19 can be turned to insert the bolt 23 into the insertion hole 27 of the connecting frame 14, and the position of the chair back 9 is fixed.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above detailed description. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.

Claims (7)

1. A chair with an adjustable chair back comprises a chair seat, wherein the chair seat is configured to be provided with a cushion, the lower end of the chair seat is connected with a chair support component, and the rear end of the chair seat is connected with a chair back support; a cantilever is further arranged between the four-bar linkage mechanism and the chair back support, the lower end of the cantilever is hinged with the four-bar linkage mechanism, and the upper end of the cantilever is rotatably connected to the chair back support; the sliding block is connected to the chair back bracket in a sliding manner, and a locking device is arranged between the sliding block and the chair back bracket; the chair back adjustable seat has an initial state and a back-chasing state, the torsion spring is arranged at any joint of the four-bar linkage mechanism, and acts on the upper connecting bar or the lower connecting bar to enable the four-bar linkage mechanism to have a forward rotating trend; in an initial state, the locking device is in a closed state, the sliding block and the chair back bracket are relatively fixed, the upper end of the cantilever is far away from the sliding block, the chair back mounting seat is in a backward position, and the torsion spring deforms to generate elasticity; when the locking device is opened, the elasticity of the torsion spring drives the four-bar mechanism to rotate forwards, the chair back is converted from the initial state to the back-tracing state, the upper end of the cantilever is close to the sliding block, and the chair back mounting seat is in the front position.

2. The chair back adjustable seat as claimed in claim 1, wherein the lower end of the cantilever is hinged to a four bar linkage by: the lower end of the cantilever is hinged with the upper connecting rod or the lower connecting rod.

3. The chair back adjustable seat as claimed in claim 2, wherein the lower end of the cantilever is hinged to the upper link; the lower end of the cantilever is spherical, a concave hole matched with the upper connecting rod is arranged in the middle of the upper connecting rod, and the lower end of the cantilever is hinged in the concave hole.

4. The chair back adjustable seat according to claim 1, wherein two ends of the upper connecting rod are respectively hinged to the upper end of the sliding block and the upper end of the chair back mounting seat, and two ends of the lower connecting rod are respectively hinged to the lower end of the sliding block and the lower end of the chair back mounting seat to form a four-bar mechanism.

5. The chair back adjustable seat of claim 4, wherein the upper link is a U-shaped body disposed in a U-shape, the U-shaped body having an open end facing downward; the lower connecting rod is positioned in a space surrounded by the U-shaped body; the torsion spring is sleeved on a hinged shaft at the upper ends of the upper connecting rod and the sliding block, one elastic arm of the torsion spring is arranged on the bottom edge inside the U-shaped body of the upper connecting rod in a lap mode, and the other elastic arm of the torsion spring is arranged on the upper surface of the lower connecting rod in a lap mode.

6. The chair back adjustable seat as claimed in claim 1, wherein the sliding connection of the slider to the chair back bracket is: the chair back support comprises an embedded frame and a connecting frame, a door-shaped hole for the sliding block to slide up and down is longitudinally arranged on the connecting frame, and the door-shaped hole is communicated with the front and the back; the two sides of the sliding block are provided with convex blocks, sliding grooves matched with the convex blocks are arranged between the embedded frame and the connecting frame, the sliding grooves are positioned on the two sides of the door-shaped hole, and after the embedded frame and the connecting frame clamp the convex blocks in the sliding grooves, the embedded frame is fixedly connected with the connecting frame through a connecting piece; the convex block slides in the sliding groove, so that the sliding block is connected to the chair back support in a sliding mode.

7. The chair back adjustable seat as claimed in claim 6, wherein the locking means is: the sliding block comprises a panel, side plates extend forwards from two sides of the panel, a bottom plate extends from the lower end of the panel, a knob is arranged on the panel, the knob penetrates through the panel to be connected with an oval block, and two ends of the oval block outwards abut against abutting pieces on two sides respectively; the abutting piece consists of a head end and a main body, the main body is provided with a through hole, a circle of convex ribs extend into the main body, the head end seals the abutting end of the abutting piece, and the tail end of the abutting piece is opened; the abutting piece is sequentially provided with a first spring and a bolt from inside to outside, one end of the first spring abuts against the inner wall of the head end of the abutting piece, and the other end of the first spring extends into the bolt; one end of the bolt is provided with a boss, after the other end of the bolt passes through a hole in the center of the convex edge, the boss abuts against the convex edge, the second spring is sleeved in the boss, one end of the second spring abuts against the convex edge, the other end of the second spring abuts against a side plate of the sliding block, and an avoidance hole for the bolt to pass in and out is formed in the side plate; a transverse partition plate is arranged on the inner side of the panel, a channel for the abutting piece to slide is formed between the transverse partition plate and the bottom plate, and two rows of jacks are respectively arranged on two sides of the door-shaped hole on the connecting frame; rotating the knob to enable the long shaft end of the oval block connected with the knob to be in a horizontal position, pushing the abutting piece outwards by the oval block to drive the first spring to be in a compressed state and push the plug pin into the jack, enabling the second spring to be in a compressed state, and enabling the locking device to be in a closed state at the moment; and then the knob is rotated to enable the short shaft end of the oval block connected with the knob to be in a horizontal position, a gap is formed between the oval block and the abutting piece, the abutting piece and the first spring move inwards under the action of the reset force of the second spring to drive the bolt to retract and separate from the jack, and the locking device is in an open state at the moment.

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