CN114587102A

CN114587102A - Rocking chair back structure and chair

Info

Publication number: CN114587102A
Application number: CN202210309042.8A
Authority: CN
Inventors: 李伟元
Original assignee: Anji Ka Bei Long Furniture Co ltd
Current assignee: Anji Ka Bei Long Furniture Co ltd
Priority date: 2022-03-28
Filing date: 2022-03-28
Publication date: 2022-06-07
Also published as: WO2023184701A1

Abstract

The invention relates to the technical field of chairs, in particular to a swingable chair back structure and a chair, which comprise a main supporting keel, a front supporting keel and a bottom keel, wherein the front supporting keel is arranged and connected on the front side of the main supporting keel, the bottom keel is fixedly connected with a chair seat and used for enabling the main supporting keel to swing left and right after the main supporting keel is arranged, a chair back component is arranged on the front supporting keel, a supporting shaft sleeve which is axially arranged in the front and back direction and can swing left and right after the main supporting keel is sleeved with the supporting shaft sleeve is integrally connected onto the bottom keel, a swinging sleeve hole which penetrates through the main supporting keel from front to back and is sleeved on the supporting shaft sleeve is formed in the main supporting keel, and a switch device used for switching the on-off state of the left and right swinging function of the main supporting keel is arranged between the bottom keel and the main supporting keel, so that the swinging effect is better.

Description

Rocking chair back structure and chair

Technical Field

The invention relates to the technical field of chairs, in particular to a rocking chair back structure and a chair.

Background

The existing chairs are of various types, structures and countless numbers, and are necessary articles for daily life of people. Particularly for office workers and students with heavy learning, a comfortable and decompressed chair is essential. The chairs in the society of today are also subject to a lot of modifications, wherein many chairs are adjustable and movable, and the chair with a rocking chair back structure is a rare one, and the chair has a good relaxing effect for users.

For example, chinese patent application No. 201920939364.4 discloses a rocking chair back, including back support, swing mechanism and back of the body frame, back support mounting is on swing mechanism, back of the body frame is installed on back support, swing mechanism includes mount pad, rotating member, spring and support column, back support rotates and installs on the mount pad, the rotating member sets up in the mount pad, and the rotating member rotates with back support to be connected, and back support does swing operation for the pivot through the rotating member, the support column is provided with two, and two support columns set up the both sides that are located the rotating member in the mount pad respectively, the spring is provided with two, and two springs set up respectively on corresponding support column, and the top and the bottom of two springs support back support and mount pad respectively, and this kind of back of chair back can the left and right rocking, but there are some inadequacies, and the rotating member in this document includes screw rod, a, The back support comprises a sleeve and a nut, wherein a through hole is formed between the bottom end of the back support and the mounting seat in a through mode, the sleeve is arranged in the through hole in a penetrating mode, two ends of the sleeve correspond to two ends of the through hole in the mounting seat respectively, the screw rod is arranged in the sleeve in a penetrating mode and matched with the nut, and the screw rod and the nut are fixed in a matched mode so that the sleeve is fixed in the through hole. It can be seen that the screw rod is a structure which is used as a carrier through a chair backrest supporting structure and is provided with other corresponding auxiliary accessories, but in the use process of the structure, the screw rod is easy to loosen and displace, and the like, and the problems that other accessories are easy to deform, the noise is high, and the like are caused. Structural integrity and comfort may be inadequate.

Disclosure of Invention

The invention aims to provide a swingable chair back structure with a better swinging effect.

The technical purpose of the invention is realized by the following technical scheme: the utility model provides a can sway back of chair structure, includes the main tributary support fossil fragments front side erection joint has preceding support fossil fragments with be used for with seat support fixed connection and supply enable after the installation of main tributary support fossil fragments the main tributary support fossil fragments sway's end fossil fragments from side to side, install back of the chair subassembly on the preceding support fossil fragments, an organic whole be connected with the axial on the end fossil fragments in the front and back direction and main tributary support fossil fragments cover can sway the support axle sleeve after establishing, run through and establish around having seted up on the main tributary support fossil fragments and establish the hole is established to the cover that sways on the support axle sleeve, the end fossil fragments with be provided with the switching device that is used for switching to the on-off state of main tributary support fossil fragments function of swaying from side to side between the main tributary support fossil fragments.

Preferably, the switch device comprises an unlocking hole which is formed in the main support keel and is arranged at the position close to the bottom of the main support keel, and a locking bolt which is arranged on the bottom keel and can be lifted up and down to complete the closing and opening of the left-right swinging function of the main support keel in a mode of entering and exiting the unlocking hole.

Preferably, the bottom keel is provided with a pull wire which is pulled to enable the locking bolt to descend and be separated from the unlocking hole, and an elastic resetting device which can enable the locking bolt to ascend and enter the unlocking hole to reset after the pull wire retracts.

Preferably, the elastic reset device comprises a spring for switching a swing function switch sleeved on the locking bolt.

Preferably, a bolt base for mounting the locking bolt is fixed in the bottom keel, the bolt base comprises a top base plate and a left base plate and a right base plate which are fixed on the left side and the right side of the top base plate and extend downwards, the locking bolt is provided with a top insertion part which is inserted upwards into the unlocking hole, a limiting sleeve for limiting the upper part of a spring for switching the swinging function switch in an abutting mode is fixedly sleeved on the periphery of the part, below the top insertion part, of the locking bolt, the lower part of the spring for switching the swinging function switch abuts against the upper surface of the top base plate, and the spring for switching the swinging function switch is located between the limiting sleeve and the top base plate.

Preferably, the elastic reset device further comprises a shifting fork which is arranged between the left base plate and the right base plate and is positioned below the top base plate and is used for driving the locking bolt to move downwards, one end of the stay wire is used as a connecting end and connected with the shifting fork, and the other end of the stay wire is used as an operating end.

Preferably, the locking bolt has a lower insertion portion passing through the top substrate and located below the top substrate, a shifted shaft rod extending left and right is inserted into the lower insertion portion, the left end of the shifted shaft rod is inserted into the left substrate and can move up and down, the right end of the shifted shaft rod is inserted into the right substrate and can move up and down, the left substrate is provided with a left lifting guide slot extending up and down for inserting the left end of the shifted shaft rod and moving up and down, the right substrate is provided with a right lifting guide slot extending up and down for inserting the right end of the shifted shaft rod and moving up and down, the shifting fork includes an upper shifting plate located above the shifted shaft rod and capable of vertically abutting against the shifted shaft rod, and left shifting claws and right shifting claws arranged at left and right intervals are formed at positions behind the upper shifting plate, the left toggle claw is positioned between the lower insertion part and the left base plate and above the part of the toggled shaft rod between the lower insertion part and the left base plate, the left toggle claw can be vertically abutted against the part of the toggled shaft rod between the lower insertion part and the left base plate, the right toggle claw is positioned between the lower insertion part and the right base plate and above the part of the toggled shaft rod between the lower insertion part and the right base plate, the right toggle claw can be vertically abutted against the part of the toggled shaft rod between the lower insertion part and the right base plate, the upper toggle plate is further integrally connected with a lower toggle plate positioned below the upper toggle plate, and the lower end part of the lower toggle plate is connected with the connecting end of the pull wire.

Preferably, the upper end of the lower dial plate is integrally connected to the front end of the upper dial plate, and a fork driving shaft extending in the left-right direction and allowing the fork to rotate is inserted into the integral connection.

Preferably, a sway-restoring spring extending in the left-right direction and used for sway-buffering and restoring of the main support keel is embedded in the main support keel, and a sway-blocking limiting rod which penetrates the main support keel forward and is clamped into a position between the left end and the right end of the sway-restoring spring at the front end part is fixed on the bottom keel.

Preferably, a spring guide sleeve extending upward and allowing the spring for switching the swing function switch to be inserted is integrally connected to the upper surface of the top substrate.

The utility model provides a chair, includes aforementioned a can sway back of the chair structure, still including being located the place ahead of end fossil fragments and with the seat support that the end fossil fragments were fixed, be provided with in the seat support with the operating end of acting as go-between is connected and is used for the pulling and rolls back the function adjustment handle that sways about the acting as go-between.

The invention has the beneficial effects that: the whole chair back swinging structure has better integrity, more stable structure, less possibility of being damaged and deformed, less noise in use and better comfort.

The operation is simpler and more convenient.

Drawings

FIG. 1 is a perspective view of a chair according to embodiment 1;

FIG. 2 is a rear elevational view of the chair back construction of FIG. 1, as rocked to the right;

FIG. 3 is a rear elevational view of the chair back structure of FIG. 1 shown without rocking;

FIG. 4 is a schematic exploded view of a portion of the chair back swing and fore/aft adjustment combination shown in FIG. 1;

FIG. 5 is a schematic view of the interior of the main support keel and seat portion of the arrangement of FIG. 1 after attachment;

FIG. 6 is a perspective view of the seat portion of FIG. 5;

figure 7 is a perspective view of the structure of figure 1 with the bottom runners removed from the seat and main support runners;

FIG. 8 is a perspective view of FIG. 7 from another perspective;

FIG. 9 is a perspective view of the portion of the latch base of the structure of FIG. 8;

FIG. 10 is a schematic view of the internal structure of the structure of FIG. 9;

FIG. 11 is a perspective view of the lower side of FIG. 9;

figure 12 is a perspective view of the structure of figure 9 as it would be mounted to a furring channel;

FIG. 13 is a perspective view of the structure of FIG. 9 with the spring guide sleeve removed;

FIG. 14 is a perspective view of the upper portion of the front support keel of the chair according to example 1;

FIG. 15 is a perspective view of the underside of the front support keel of the chair of embodiment 1;

FIG. 16 is a right side view of the structure of FIG. 1 taken along the front-to-rear direction from the right-to-left center of the chair;

FIG. 17 is a cross-sectional view of the chair construction of embodiment 1 at the bottom keel with the back swing function closed;

FIG. 18 is a cross-sectional view of the arrangement of FIG. 17 with the seat back swing function open;

FIG. 19 is a front elevational view of the chair construction of embodiment 1 with the main support runner broken away with the seat-back sway function closed;

FIG. 20 is a cross-sectional view of the arrangement of FIG. 19 with the seat back recline function open;

fig. 21 is a right side view of the chair back forward-backward adjustment function section of the chair according to embodiment 1;

FIG. 22 is a cross-sectional view of the arrangement of FIG. 21 with the front support keel forwardly adjusted;

figure 23 is a view of the upper portion of the front support keel as it moves after adjustment of the structure of figure 22;

fig. 24 is a state diagram of the chair back of the chair according to embodiment 1 deformed by being twisted leftward from a normal state;

fig. 25 is a state diagram in the process of mounting the back forward-backward adjusting function portion of the chair according to embodiment 1;

FIG. 26 is a view of the structure of FIG. 25 with additional components mounted thereto;

FIG. 27 is a view showing a front side member further mounted to the structure of FIG. 26;

FIG. 28 is a view showing the front member further mounted to the structure of FIG. 27;

fig. 29 is a disassembled perspective view of the headrest structure of the chair according to embodiment 1;

FIG. 30 is a perspective view of the bottom side of FIG. 29;

FIG. 31 is a perspective view of the headrest assembly of FIG. 29 in a disassembled state;

fig. 32 is a perspective view of the chair according to embodiment 1 with the left and right headrests rotated horizontally;

FIG. 33 is a view of the upper support beam in the configuration of FIG. 29 as adjusted by moving it forward;

FIG. 34 is a perspective view of the upper support beam of FIG. 33 about to adjust to a forward most position;

FIG. 35 is a perspective view of the upper support beam of FIG. 34 in a forward most position and with the snap retainer fully collapsed;

FIG. 36 is a schematic perspective view of the upper support beam of FIG. 35 about to adjust to a final position;

FIG. 37 is a perspective view of the upper support beam of FIG. 36 in a rearward most position and with the spring biased clips open to a working position;

FIG. 38 is a right side elevational view of the upper support beam and headrest assembly of the configuration of FIG. 29, shown in the pivot connection;

figure 39 is a right side elevational view of the swivel base and upper support runner pivot joint of the structure of figure 29;

fig. 40 is a perspective view of a chair according to example 1, with a cut-away structure of a headrest structure portion connected to a front support keel;

FIG. 41 is a perspective view of the base support portion of the swivel base of the structure of FIG. 29 shown with the upper support beam removed;

FIG. 42 is a perspective view of the headrest assembly of FIG. 29, with the front portion of the headrest removed;

FIG. 43 is a perspective view of the structure of FIG. 42, after the front base plate of the middle headrest has been attached thereto;

fig. 44 is a disassembled perspective view of the armrest structure of the chair according to embodiment 1;

FIG. 45 is a perspective view of the lower portion of FIG. 44;

FIG. 46 is a schematic view of the armrest of the configuration of FIG. 44, as assembled with the right and left lateral movement guides;

FIG. 47 is a schematic perspective view of the lift adjustment linkage of FIG. 44 as assembled;

FIG. 48 is a schematic perspective view of the armrest substrate support plate of FIG. 44 shown in an exploded top view;

FIG. 49 is a bottom view of the armrest center of rotation block of FIG. 44 with the resilient stop structure mounted therein;

FIG. 50 is a bottom view of the armrest forward-rearward movement adjustment guide in the configuration of FIG. 44, with an elastic stop feature mounted therein;

FIG. 51 is an explanatory view of the armrest body part of the configuration of FIG. 44, as adjusted in different positions;

FIG. 52 is a top view of the armrest of FIG. 44, shown assembled with another structure at the forward and backward movement adjustment limit slot;

FIG. 53 is an assembly view of the armrest side-to-side shift guide and armrest base support plate of the configuration of FIG. 44;

FIG. 54 is an assembly view of the underside position of the armrest structure in the configuration of FIG. 44;

FIG. 55 is a view of the armrest structure of FIG. 44 in a raised or lowered height adjustment position;

FIG. 56 is a view showing the structure of FIG. 55 when the height of the armrest is adjusted;

fig. 57 is a perspective view of an armrest sleeve portion of a chair according to example 1;

FIG. 58 is a sectional view of the armrest structure of the chair according to example 1, taken along the armset socket portion;

fig. 59 is a disassembled perspective view of the chair back assembly of the chair of embodiment 1.

Detailed Description

The following specific examples are given by way of illustration only and not by way of limitation, and it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made in the examples without inventive faculty, and yet still be protected by the scope of the claims.

Embodiment 1, as shown in fig. 1-59, a rocking chair back structure, including main support keel 1, the preceding support keel 2 that main support keel 1 front side erection joint has and be used for with seat support fixed connection and supply main support keel 1 installation back enable main support keel 1 sways from side to side bottom keel 3, main support keel 1 and bottom keel 3 all can be formed through plastic materials such as aluminum alloy or pp integrated processing, but preceding support keel adopts plastics material processing as far as possible, for example pp material or PA adds glass fiber material etc. processing and forms, because preceding support keel needs certain plasticity to supply the human body to support the use in the front. The utility model discloses a chair, including preceding support keel 2, back of the chair subassembly is the structure that directly supplies people's back to lean on, can adopt current back of the chair leaning on structure also can adopt the structure in the embodiment at the back, an organic whole is connected with the axial in front and back direction on end keel 3 and main support keel 1 cover is established the back can the left and right sides support axle sleeve 31 that sways, run through around and the cover is established on main support keel 1 sway cover establishing hole 11 on the support axle sleeve 31, in this kind of structural design, support axle sleeve 31 is integrated into one piece on the support structure of this kind of chair basis on end keel, also is end keel and support axle sleeve 31 be the structure that same material integrated into one piece produced, main support keel 1 is direct to rotate and realize wobbling function around end keel's support axle sleeve 31, main support keel 1 and preceding support keel 2 are the front and back connection and form a holistic back of the chair structure, thus, the chair back component can swing left and right together with the main support keel 1 after being connected to the front support keel 2, thereby realizing the function of the left and right swing of the chair back. And the above-mentioned supporting shaft sleeve 31 and the integrative structure of keel 3 for whole swing structure's wholeness can be higher, and the result of use also can promote.

Of course, the end keel 3 with be provided with between the main tributary joist 1 and be used for carrying out the switching device that switches to the on-off state of main tributary joist 1 yaw function, also be a structure to the function switch that sways of the back of the chair promptly for when needs, the back of the chair can sway, when not required, just closes, can select according to user's actual conditions.

The specific structure is as follows: the switch device comprises an unlocking hole 101 which is arranged at the position, close to the bottom, of the main support keel 1 and is formed from top to bottom, and a locking bolt 301 which is arranged on the bottom keel 3 and can lift up and down to complete the closing and opening of the left-right swinging function of the main support keel 1 in a mode of passing in and out the unlocking hole 101. The main support keel 1 may be in the form of an elongated standing keel structure extending in an up-down direction. The bottom keel 3 is preferably an L-shaped keel structure, which includes an upright bottom keel portion 331 and a lying bottom keel portion 332, the upright bottom keel portion 331 and the lying bottom keel portion 332 are integrally connected, the supporting sleeve 31 is integrally connected and formed on the front side portion of the upright bottom keel portion 331, and the front side portion of the lying bottom keel portion 332 is fixedly connected with the seat. An arc-shaped step swing guide groove 333 positioned below the support shaft sleeve 31 is formed at the integral connection position of the bottom keel vertical part 331 and the bottom keel horizontal part 332, the arc-shaped step swing guide groove 333 is of a downward arc-shaped groove structure, the overall outer contour of the bottom of the main support keel 1 is consistent with the shape of the arc-shaped step swing guide groove 333 and is also of a downward arc shape, the bottom of the main support keel 1 is close to the groove bottom of the arc-shaped step swing guide groove 333 as much as possible, the compactness of the structure is ensured by reducing gaps, and the left-right swing of the main support keel 1 is not influenced. However, such a structure needs to be optimized, and can not swing without limitation, so a certain swing limiting structure is needed, specifically, a swing limiting protrusion 334 protruding upwards is integrally connected to the bottom keel at the position near the middle of the left and right sides of the groove bottom of the arc-shaped step swing guiding groove 333, the bottom of the main support keel 1 is formed with a left-right rocking restricting groove 134 which is upwardly concave and extends left and right, the rocking restricting protrusion 334 is upwardly inserted into the left-right rocking restricting groove 134, when the main supporting keel 1 swings left and right, the swing limiting protrusion 334 touches the left side groove wall or the right side groove wall of the left and right swing limiting groove 134, which is the limiting position of swinging right and left, thereby avoiding excessive swinging, ensuring the use safety, of course, the rocking motion of the rocking restricting projection 334 does not affect the smooth progress of the rocking motion at the position between the left and right groove walls of the left and right rocking motion restricting groove 134. The unlocking hole 101 is formed in a portion of the main support keel 1 above the yaw restricting groove 134 and is vertically communicated with the yaw restricting groove 134, and the unlocking hole 101 is preferably a strip-shaped hole extending in the front-rear direction, so that sufficient margin is provided in the front-rear direction to ensure the insertion reliability of the locking bolt 301. Meanwhile, the swing limiting protrusion 334 is provided with a corresponding reference hole 3340 which is through up and down and is used for the locking bolt 301 to pass through up and down and communicated with the area below the bottom keel, so that the locking bolt 301 can enter the unlocking hole 101 after passing through the bottom keel, and particularly the locking bolt 301 is arranged in a penetrating manner in the downward direction of the integral connecting part of the upright part 331 and the horizontal part 332 of the bottom keel.

The operation of moving the locking bolt 301 up and down can be realized by the following structure: the bottom keel 3 is provided with a pull wire 302 which is pulled to enable the locking bolt 301 to descend and be separated from the unlocking hole 101, and an elastic resetting device which can enable the locking bolt 301 to ascend and enter the unlocking hole 101 to reset after the pull wire 302 retracts. When the pull wire 302 is pulled, the locking bolt 301 descends, the swinging function is started, and after the pull wire is loosened, the elastic resetting device can elastically lift the locking bolt 301 upwards, so that the locking bolt 301 is upwards inserted into the unlocking hole 101 to close the swinging function. Further, the elastic reset device comprises a spring 303 for switching the swing function switch, which is sleeved on the locking bolt 301. The specific application case is as follows: a bolt base 4 for installing the locking bolt 301 is fixed in the bottom keel 3, the bolt base 4 is fixed at the lower side part of the integral connection part of the locking bolt 301 located at the upright part 331 and the horizontal part 332 of the bottom keel, the bolt base 4 comprises a top base plate 41 and a left base plate 42 and a right base plate 43 which are respectively fixed at the left side and the right side of the top base plate 41 and extend downwards, the top base plate 41, the left base plate 42 and the right base plate 43 of the bolt base 4 can be structures manufactured by plastic integral forming, and the bolt base 4 can be fixedly connected with the bottom keel 3 through the existing fixing modes such as screw thread connection, glue bonding and the like. The locking bolt 301 is provided with a top inserting part 3011 which is upwards inserted into the unlocking hole 101, a limiting sleeve 3012 which is used for limiting the upper part of the spring 303 for switching the swing function switch in an abutting mode is fixedly sleeved on the periphery of the part, below the top inserting part 3011, of the locking bolt 301, the locking bolt 301 and the limiting sleeve 3012 can be made of steel materials and can be fixed in the existing fixing mode of integral casting forming or welding and the like, the lower part of the spring 303 for switching the swing function switch abuts against the upper surface of the top substrate 41, and the spring 303 for switching the swing function switch is located between the limiting sleeve 3012 and the top substrate 41. The lower portion of the spring 303 for switching the swing function switch may abut against the upper side portion of the upper dial plate 441 or the upper side portions of the left and

right toggle claws

4411 and 4412 of the upper dial plate 441, which will be mentioned later, but it is preferable that the lower portion of the spring 303 for switching the swing function switch abuts against a relatively fixed portion inside or outside the latch base 4 as much as possible because the upper dial plate 441 is deflected downward, that is, has a falling component, which is smaller than that of the latch 301, and the spring 303 for switching the swing function switch is not compressed and restored in the course of the latch 301 being ensured to fall.

In order to better use the pull wire, the design is as follows: the elastic resetting device further comprises a shifting fork 44 which is positioned between the left side base plate 42 and the right side base plate 43 and is positioned below the top base plate 41 and used for driving the locking bolt 301 to move downwards, wherein one end of the stay wire 302 is used as a connecting end 3021 to be connected with the shifting fork 44, and the other end of the stay wire 302 is used as an operating end 3022, so that a lever structure is formed, pulling is easier, and the operating end 3022 can extend into a seat, and operation is facilitated for a user.

More specifically, the locking latch 301 has a lower insertion portion 3013 passing through the top board 41 downward and located below the top board 41, the lower insertion portion 3013 is provided with a toggled shaft 30133 extending left and right, the left end of the toggled shaft 30133 is inserted into the left board 42 and can move up and down, the right end of the toggled shaft 30133 is inserted into the right board 43 and can move up and down, the left board 42 is provided with a left lifting guide slot 421 extending up and down for the left end of the toggled shaft 30133 to be inserted and move up and down, the right board 43 is provided with a right lifting guide slot 431 extending up and down for the right end of the toggled shaft 30133 to be inserted and move up and down, the shift fork 44 comprises an upper toggle plate 441 located above the toggled shaft 30133 and can abut against the toggled shaft 30133 up and down, a left toggle 4411 and a right toggle claw 4412 arranged left and right at an interval are formed at a position behind the upper toggle plate 441, left toggle gripper 4411 is located between lower insert portion 3013 and left baseplate 42 and above the portion of toggled shaft 30133 between lower insert portion 3013 and left baseplate 42, and the left toggle gripper 4411 can abut up and down with the portion of the toggled shaft 30133 between the lower insertion portion 3013 and the left baseplate 42, right toggle claw 4412 is located between lower insert section 3013 and right baseplate 43 and above the section of toggled shaft 30133 between lower insert section 3013 and right baseplate 43, and the right toggle claw 4412 can abut up and down with the portion of the toggled shaft 30133 between the lower insertion portion 3013 and the right baseplate 43, the shift fork 44 further includes a lower shift plate 442 integrally connected to the upper shift plate 441 and located below the upper shift plate 441, the lower dial plate 442 is connected to the connection end 3021 of the wire 302 at a lower end portion thereof. In such a structure, the locking bolt 301 can be more stably lowered in a labor-saving manner by pulling the pull wire 302 to start the swing function, the pull wire 302 is retracted and elastically restored by loosening the pull wire 302, and the locking bolt 301 is raised to close the swing function. Preferably, the upper end of the lower driving plate 442 is integrally connected to the front end of the upper driving plate 441, a shift fork driving shaft 443 extending left and right is inserted into the integrally connected position, the shift fork driving shaft 443 is mounted on the left base plate 42 and the right base plate 43, and the left base plate 42 and the right base plate 43 are respectively provided with a hole structure for positioning and mounting the shift fork driving shaft 443, so that the shift fork 44 can be preferably rotated as a transfer structure to switch the swing function. Here, when the left-right rocking function of the main support keel 1 is in a closed state, the lower toggle plate 442 tilts to the rear lower side, the pull wire 302 is located in front of the lower toggle plate 442, at this time, if the pull wire is pulled forward in the front direction, the pull wire 302 drives the shift fork to rotate forward, the lower toggle plate 442 deflects forward, and the left-right toggle claw can toggle the toggled shaft 30133 downward and drive the locking bolt 301 to descend at the same time, so that the chair back rocking function can be opened, and once the retracting pull wire is released, the locking bolt 301 can elastically reset upward, and the chair back rocking function is closed.

The left-right swinging function of the chair back is better improved, a swinging reset spring 1000 which extends left and right and is used for buffering and resetting the left-right swinging of the main support keel 1 is arranged in the main support keel 1, a left-right swinging blocking limiting rod 1001 which penetrates the main support keel 1 forwards and is clamped into the position between the left end and the right end of the swinging reset spring 1000 by the front end part is fixed on the bottom keel 3, a spring bin 1002 which extends left and right and seals the left and right sides and is used for embedding the swinging reset spring 1000 is arranged on the main support keel 1, the spring bin 1002 can be directly formed on the main support keel 1 or embedded and fixed on the main support keel 1 by an embedding piece which is formed with the spring bin 1002, the embedding piece can be integrally formed by plastic, and preferably and respectively and integrally connected with a positioning bulge which can be inserted into the left end of the swinging reset spring 1000 and a positioning bulge which is inserted into the right end of the swinging reset spring 1000 on the bin walls of the left and right sides of the spring bin 1002, in order to ensure the good positioning of the left and right sides of the rocking return spring 1000, the left and right rocking blocking limiting rod 1001 is preferably clamped into the position near the center between the left end and the right end of the rocking return spring 1000, so that the rocking return spring 1000 is divided into two sections, one section is between the left bin wall of the spring bin 1002 and the left and right rocking blocking limiting rod 1001, and the other section is between the right bin wall of the spring bin 1002 and the left and right rocking blocking limiting rod 1001, when in use, the left and right rocking blocking limiting rod 1001 is not in the left and right position, even when the rocking function is turned on, the left and right rocking blocking limiting rod 1001 is not in the right position, and the left and right bin walls of the spring bin 1002 rock left and right along with the main supporting keel, so that when the main supporting keel rocks to the left, one section on the right side of the rocking return spring 1000 is compressed, and has the buffering and resetting effects, if the main support keel swings rightwards, the section on the left side has a corresponding effect, and when a human body does not apply force, the main support keel can restore to a position close to the middle left and right, wherein the position of the left and right swing blocking limiting rod 1001 is not fixed, and the main support keel can swing leftwards and rightwards, so that the main support keel allows the left and right swing blocking limiting rod 1001 to pass through the opened hole and extends leftwards and rightwards, so that the left and right swing of the main support keel is not blocked by the left and right swing blocking limiting rod 1001, the main support keel is an avoiding hole 1003 close to the middle position at the position of the spring bin 1002, the avoiding hole 1003 is in a waist shape or a fan ring shape to match the left and right swing of the main support keel, for example, the left and right swing blocking limiting rod 1001 is preferably arranged above the support shaft sleeve 31, namely, the avoiding hole 1003 is preferably in a fan ring shape with an upward arc arch shape, because the main support keel is located at the avoiding hole 1003 and circularly swings along the upper half of a circular path formed by the radius from the left-right swinging barrier limiting rod 1001 to the center of the support shaft sleeve 31, the avoiding hole can be well matched with the left-right swinging barrier limiting rod 1001 for use. In the swing function off state or the initial state after the swing function is turned on, the left-right swing blocking limiting rod 1001, the unlocking hole 101 and the locking bolt 301 are all in the left-right center positions after being installed as far as possible, so that the left-right structure is ensured to be symmetrical and stable. During installation, a circular wear-resistant ring can be sleeved in the swinging sleeving hole 11, and then the supporting shaft sleeve 31 is sleeved in the wear-resistant ring. In addition, the front side surface of the bottom keel upright part 331 and the rear side of the main support keel are abutted as much as possible to ensure the compactness of the structure, and a wear-resistant washer or gasket and the like can be clamped between the front side surface of the bottom keel upright part 331 and the rear side of the main support keel, so as to reduce the wear when the chair back swings.

Preferably, a spring guide protection sleeve 3033 extending upwards and allowing the spring 303 for switching the swing function switch to be inserted is integrally connected to the upper surface of the top substrate 41, so as to provide better guiding and protecting effects for the spring 303 for switching the swing function switch, a protection sleeve insertion slot 33033 extending upwards from the bottom of the swing limit protrusion 334 and communicating with the reference hole 3340 is formed on the swing limit protrusion 334, the spring guide protection sleeve 3033 can be inserted into the protection sleeve insertion slot 33033, and the spring guide protection sleeve 3033 can carry the locking pin 301 to be better assembled and connected to the bottom keel during installation without affecting the lifting and lowering of the locking pin 301.

Of course, the above embodiment is a comparative optimization case. There are numerous ways of implementing the concepts of the present application. For example, the pull wire 302 may be directly connected to the lower portion of the dead bolt 301.

Based on the above structure, the present embodiment further provides a chair, which includes the above rocking chair back structure, and further includes a chair seat z located in front of the bottom frame 3 and fixed with the bottom frame 3, the seat z is provided with a left-right rocking function adjusting handle z1 connected to the operation end 3022 of the pulling wire 302 for pulling and retracting the pulling wire 302, the existing structure can be adopted, and the operation is convenient for users, for example, the left-right rocking function adjusting handle z1 adopts a handle moving left and right, so the left end of the left-right rocking function adjusting handle z1 is positioned in the chair seat and connected with the operation end 3022 of the pull wire 302, the right end of the left-right rocking function adjusting handle z1 extends out of the chair seat for the pulling operation of users, and the right end part of the left-right rocking function adjusting handle z1 can be a sheet structure which is convenient for the left-right push-pull of hands and is exposed outside the chair seat. The seat is provided with a plurality of stay wire guide grooves z2, and the stay wires are guided to the left end of the left-right rocking function adjusting handle z1 and connected. The chair seat is also internally provided with a transverse push-pull guide groove z3 for guiding the left-right rocking function adjusting handle z1 to move left and right in a push-pull way, the front and rear groove walls of the transverse push-pull guide groove z3 are respectively provided with a chair back rocking function closing position groove z31 and a chair back rocking function opening position groove z32 which are distributed at intervals left and right, the front and rear sides of the left-right rocking function adjusting handle z1 are respectively connected with a clamping elastic sheet z33 which protrudes forwards and a clamping elastic sheet z33 which protrudes backwards, the front clamping elastic sheet z33 is matched with the front rocking chair back function closing position groove z31 and the chair back rocking function opening position groove z32, the rear clamping elastic sheet z33 is matched with the rear chair back rocking function closing position groove z31 and the chair back rocking function opening position groove z32, the clamping elastic sheet z33 is preferably an arc-shaped sheet body structure with the chair back deformation capability, the rocking function closing position groove z31 and the chair back rocking function opening position groove z32 are preferably arc-shaped groove structures, at the beginning, the elastic sheet z33 for clamping is clamped in the closed position groove z31 for the chair back swinging function, at the moment, the stay wire is not pulled, the stay wire is in a balanced state pulled by the elastic resetting device, the locking bolt 301 is inserted into the unlocking hole 101, the chair back swinging function is closed, when the left-right swinging function adjusting handle z1 is pulled rightwards, the operating end of the stay wire is also pulled rightwards and acts on the connecting end to enable the shifting fork 44 to act to drive the locking bolt 301 to descend, meanwhile, the elastic sheet z33 for clamping is also moved rightwards and enters the unlocking position groove z32 for the chair back swinging function to be clamped, the locking bolt 301 is separated downwards from the unlocking hole 101, the chair back swinging function is opened, and at the moment, the chair back can swing leftwards and rightwards. When the left-right rocking function adjusting handle z1 is pushed back to the left, and in the process, because the pull wire is in a relaxed state after being retracted, the rocking function switch switching spring 303 of the elastic resetting device is reset and opened from a compressed state when the rocking function is started, the locking bolt 301 is inserted into the unlocking hole 101 again, and at the moment, the clamping elastic piece z33 is clamped into the chair back rocking function closing gear groove z 31. In order to have good protection effect on the whole structure, a swinging function opening buffer spring z34 for slowing down the left-right swinging function adjusting handle z1 to move rightwards to open the swinging function is further arranged in the chair seat, the swinging function opening buffer spring z34 extends leftwards and rightwards, the left end of the swinging function opening buffer spring can be connected to the left-right swinging function adjusting handle z1, the right end of the swinging function opening buffer spring is connected with a structure in the chair seat, the effect lies in that the buffering effect is achieved when the swinging function opening buffer spring is opened, so that the whole starting structures such as a stay wire and a shifting fork cannot be damaged by pulling, and the effect of resetting and saving labor is achieved when the chair seat is closed.

Through foretell structural design for the function of swaying of the back of the chair is further optimized, and not only easy operation is convenient laborsaving, and structural stability is better when swaying, and it is also more comfortable to use, more does benefit to and relaxs and decompress.

Embodiment 2, referring to the drawings in embodiment 1, a swingable chair back structure is further optimized as the structure in embodiment 1, and may be used on the basis of the structure in embodiment 1, that is, the structural features of the embodiments may all be applied to this embodiment, and of course, the structure in this embodiment may also be applied to chairs of other structures alone.

The rocking chair back structure comprises a main supporting keel 1, a front supporting keel 2 which is arranged and connected with the front side of the main supporting keel 1, and a bottom keel 3 which is used for fixedly connecting and supplying the seat with the seat, the main supporting keel 1 is installed and then the main supporting keel 1 swings left and right, a chair back component is arranged on the front supporting keel 2, a supporting shaft sleeve 31 which can swing left and right is arranged on the bottom keel 3 in the axial direction and in the front and back direction, the main supporting keel 1 is sleeved with the main supporting keel 1, a hole 11 is arranged on the supporting shaft sleeve 31 in the front and back direction in a penetrating way and sleeved with the rocking sleeve, a front and back extending way is arranged in the supporting shaft sleeve 31 and used for adjusting the front supporting keel 2 relative to the front and back position adjusting rotating shaft 5 of the main supporting keel 1, the back end of the front and back position adjusting rotating shaft 5 penetrates out the bottom keel 3 and is fixedly connected with a hand wheel 51, the hand wheel 51 rotates to enable the front and rear position adjusting rotating shaft 5 to rotate, the axial direction of the front and rear position adjusting rotating shaft 5 is the front and rear direction, the front end of the front and rear position adjusting rotating shaft 5 penetrates out of the bottom keel 3 forwards and penetrates through the swinging sleeve arranging hole 11 simultaneously, namely the front and rear position adjusting rotating shaft 5 penetrates through the bottom keel 3 forwards and backwards and passes through the inner space of the supporting shaft sleeve 31, the swinging sleeve arranging hole 11 is formed in the periphery of the supporting shaft sleeve 31 in a sleeved mode, the front and rear position adjusting rotating shaft 5 can penetrate through the main supporting keel 1, and therefore the front end of the front and rear position adjusting rotating shaft 5 can penetrate through the main supporting keel 1 forwards to serve as an operation and control component. The method specifically comprises the following steps: the front and rear position adjusting rotating shaft 5 is located in front of the swinging sleeve hole 11 as a driving end part 50, the driving end part 50 is connected with a driving gear set in an installing manner, the driving gear set is also connected with a connecting rotating shaft 52 which extends forwards and can extend forwards into the bottom part of the front support keel 2 in an installing manner, the front and rear position adjusting rotating shaft 5 is used as an input end part of the driving gear set, the connecting rotating shaft 52 is used as an output end part of the driving gear set, the outer surface of the connecting rotating shaft 52 is provided with an external thread 521, a front support keel bottom inner cavity 21 which extends backwards and forwards and is used for the connecting rotating shaft 52 to extend forwards is arranged in the bottom part of the front support keel 2, a driving threaded sleeve 22 which extends forwards and backwards and forwards is integrally connected in the front support keel bottom inner cavity 21 and enables the connecting rotating shaft 52 to be screwed and can move forwards and backwards and forwards after extending forwards, the driving threaded sleeve 22 has a front and rear through internal threaded hole 221 that is engaged with the external thread 521 of the connecting shaft 52. In the above structure, the front and rear position adjusting rotating shaft 5 rotates to drive the driving end portion 50 to rotate, the driving end portion 50 rotates to drive the driving gear set, the driving gear set may adopt the existing gear box structure or a more practical structure provided in the present embodiment, mainly for realizing transmission effectiveness and labor saving, the gear set is connected with the connecting rotating shaft 52, the connecting rotating shaft 52 is also driven to rotate, the connecting rotating shaft 52 has an external thread 521 on the outer surface, which can be nested and matched with the internal thread hole 221, and through rotating clockwise rotation or counterclockwise rotation, the connecting rotating shaft 52 can not only be connected with the driving threaded sleeve 22 through the matching of threads, but also can realize the front and rear position adjustment of the driving threaded sleeve 22 through rotation, and thus can complete the front and rear position adjustment of the front and rear support keels 2 and the chair back component mounted on the front and rear support keels 2 for the back of a person to lean directly, the connection shaft 52 is fixedly connected after stopping rotating, the main operation is to rotate clockwise or counterclockwise through a hand wheel, so that the connection shaft 52 also rotates counterclockwise and clockwise correspondingly, the position of the connection shaft 52 is ensured to be immovable forward and backward after being installed on the driving gear set, that is, the connection shaft 52 is axially locked in a limited way and cannot be moved, so that the connection shaft 52 which is not axially moved can enable the driving threaded sleeve 22 to move forward and backward on the connection shaft 52 through rotation, of course, when the chair is produced and installed, the connection shaft 52 can first connect a part with the external thread 521 and a part of the driving threaded sleeve 22 through threads, in addition, the connection shaft 52 is not provided with the external thread in the whole section, and only one section in front of the connection shaft can be provided with the external thread, but the external thread is ensured to be enough to drive the threaded sleeve 22 to move forward and backward without departing, in addition, it is needless to say that the front support runner 2 itself needs to be provided with a structure having a certain position restriction, and the use is prevented from being affected by the fact that the front-rear position adjustment is not controlled.

It can be seen from the above structure that, the design of the supporting shaft sleeve 31 not only sets the main supporting keel at the periphery for the swing of the chair back, but also can adjust the front and rear positions of the chair back by penetrating the front and rear position adjusting rotating shaft 5 in the supporting shaft sleeve 31, through such a middle transition structure, the whole chair structure is connected in series, the integrity is better, and the chair back is more compact, and what needs to be supplemented is that, for example, under the condition that the front and rear position adjusting rotating shaft 5 is not penetrated in the middle, or when the supporting shaft sleeve 31 is only used for realizing the swing function, the solid shaft can be filled in the sleeve of the supporting shaft sleeve 31, that is, under this condition, the supporting shaft sleeve 31 is the same as the solid shaft, and all should fall into the protection scope of the present application.

Preferably, the driving gear set includes an upper gear 501 mounted and connected to the driving end portion 50 and a lower gear 502 mounted and connected to the rear end portion of the connecting shaft 52, the upper gear 501 and the lower gear 502 are disposed up and down and engaged, and the diameter of the upper gear 501 is larger than that of the lower gear 502. The upper gear 501 can be connected to the driving end portion 50 of the front-rear position adjusting rotating shaft 5 by the existing installation method, for example, installation connection is performed by a spline assembly method, mainly circumferential positioning, but in the existing gear installation method, preferably axial positioning is performed, structures such as snap spring positioning, shaft shoulder positioning, step positioning, retaining ring positioning or shaft sleeve positioning are assembled on the front and rear sides of the upper gear 501 in the axial direction of the front-rear position adjusting rotating shaft 5, so that relative rest between the upper gear 501 and the front-rear position adjusting rotating shaft 5 is appropriate, transmission effectiveness is ensured, similarly, the lower gear 502 is fixedly connected to the connecting rotating shaft 52 by the installation method, the diameter is set to be labor-saving, and force application can be easier by driving the upper gear with a larger diameter size to transmit to the pinion with a smaller diameter, the teeth of the upper gear 501 and the lower gear 502 may be identical in size and shape, but the root circle diameter of the upper gear 501 may preferably be 1.2-2 times the root circle diameter of the lower gear 502, for example, the root circle diameter of the upper gear 501 may be 12cm, the root circle diameter of the lower gear 502 may be 6-10cm, and the radial dimension of the teeth may be 1cm, the radial dimension of the teeth should be as small as possible, and typically, the root circle diameter of the upper gear 501 may be 10-20 times the radial dimension of the teeth thereon. The structure through two axles is more optimized like this, of course, can only with front and back position adjustment pivot 5 and set up the screw thread on front and back position adjustment pivot 5 with drive threaded sleeve 22 direct coordination, also need not the gear drive structure, but such structure operation is very hard, in addition, to this condition front and back position adjustment pivot 5 need be spacing to keep the stability of front and back position adjustment pivot 5 front and back position around main tributary strut fossil fragments in the side around this condition, there is the great pressure of axial, it produces great extrusion force exactly at the spacing structure of axial and main strut fossil fragments, can make the hand wheel rotate more hard. Of course, although the front-back position of the front-back position adjusting rotating shaft 5 should be kept stable as much as possible under the above two-shaft structure, in addition, in order to make the rotation more smooth, in this embodiment, a circular and smooth rear pressing plate h2 located between the hand wheel and the rear side of the main supporting keel and a circular and smooth front pressing plate h1 located between the front side of the main supporting keel and the upper gear 501 may be installed on the front-back position adjusting rotating shaft 5, the hand wheel is installed and fixed at the rear end of the front-back position adjusting rotating shaft 5 and axially abuts against the rear pressing plate h2, and the upper gear 501 is installed and fixed at the front end of the front-back position adjusting rotating shaft 5 and abuts against the front pressing plate h1, so as to maintain the stability of the driving structure and facilitate the operation of rotation.

In order to further improve the effectiveness of the connecting rotating shaft 52, the lower gear 502 is firstly fixedly installed on the connecting rotating shaft 52, it is also mentioned that the lower gear 502 needs to be axially and circumferentially limited, particularly, in the axial direction, a step can be directly formed on the shaft of the connecting rotating shaft 52 and abuts against the front side of the lower gear 502, a bearing k can be arranged on the shaft of the connecting rotating shaft 52 and positioned at the rear side of the lower gear 502, a circular embedding groove is formed on the front side part of the main support keel 1 for the bearing k to be embedded in, preferably, the rear end part of the connecting rotating shaft 52 passes through the bearing k backwards, and the rear side part of the lower gear 502 close to the position where the connecting rotating shaft 52 is sleeved is axially abutted against the front side part of the inner ring of the bearing k, so that the rotation adjusting process is smoother, and on the other hand, the front and rear positions of the connecting rotating shaft 52 are ensured to be stable to ensure the stability of the connection with the front support keel, a round and smooth shaft end rear positioning ring 555 which can be abutted against the rear part is arranged on the rear part of the main support keel 1, a shaft end positioning bolt 556 is axially arranged in the front and back of the shaft end rear positioning ring 555 in a penetrating manner, the screw head of the shaft end positioning bolt 556 is abutted against the rear side of the shaft end rear positioning ring 555, the screw rod part of the shaft end positioning bolt 556 forwards penetrates through the main support keel 1 and can be connected with the rear end part of the connecting rotating shaft 52, a positioning screw hole which is recessed from the front of the rear end surface and is used for the screw rod part of the shaft end positioning bolt 556 to be screwed and fixed is arranged in the rear end part of the connecting rotating shaft 52, the mounting mode is that the rear end part of the connecting rotating shaft 52 can be connected with the main support keel 1 without being penetrated backwards, and the mounting mode can be that the rear end part of the connecting rotating shaft 52 penetrates through the main support keel 1 backwards, the rear end part of the connecting rotating shaft 52 is directly sleeved with the shaft end rear positioning ring 555, in this way, the inner ring of the shaft end rear positioning ring 555 and the outer surface of the rear end part of the connecting rotating shaft 52 need to form corresponding thread structures, and are fixed in a sleeving and threaded connection mode. The two modes can stabilize the front and back positions of the connecting rotating shaft 52, and in the operation process of the front and back position adjusting rotating shaft 5, the connecting rotating shaft 52 only rotates and cannot move back and forth, so that the front and back positions of the front support keel 2 are changed, and the most effective and stable front and back positions of the chair back component are achieved.

Preferably, the front side cover of the main support keel 1 is provided with a driving gear group protecting cover 53 capable of covering the upper gear 501 and the lower gear 502, the driving gear group protecting cover 53 can be a plastic cover or an aluminum alloy cover, and can be mounted on the main support keel 1 through a buckling structure or a screw structure and other mounting manners, so that the function of protecting each part of the internal driving gear group part is mainly achieved, in addition, when the front side part of the main support keel 1 is provided with a spring bin 1002, and the bin mouth of the spring bin 1002 faces forwards, the swinging return spring 1000 is exposed and separated after being placed into the spring bin 1002, and the driving gear group protecting cover 53 can cover the bin mouth of the spring bin 1002 and block the swinging return spring 1000 at the front side so as to seal the swinging return spring 1000 in the spring bin 1002, so that the swinging return spring 1000 follows the compressing and expanding actions caused by the left-right swinging of the chair back as far as possible, the swing effectiveness and the structural stability are ensured, and unnecessary disturbance is reduced. The bottom part of preceding support keel 2 is grafting portion 20 at the bottom of the bellied preceding support keel backward, the leading flank department an organic whole of drive gear group protective cover 53 be connected with extend forward and with the confession of the regional intercommunication that drive gear group protective cover 53 covered the grafting portion 20 is inserted the socket pipe 531 that inserts the access backward at the bottom of the preceding support keel, grafting portion 20 can overlap earlier with the socket pipe 531 around at the bottom of the preceding support keel and catch for the periphery of connecting pivot 52 has and leans on outer protective structure and joint, and the wholeness and the protectiveness of whole structure all can be better like this. The socket 531 and the bottom inserting part 20 of the front support keel can adopt a rectangular structure, and are practical in strength and production and installation. Then, the front support keel bottom inner cavity 21 is arranged in the front support keel bottom inserting part 20, the front support keel bottom inner cavity 21 is formed by the fact that the front support keel bottom inserting part 20 extends backwards and forwards and is sunken, of course, the sleeve 531 and the front support keel bottom inserting part 20 can be used for enabling the connecting rotating shaft 52 to extend forwards, therefore, the connecting rotating shaft 52 is externally provided with the sleeve 531, the front support keel bottom inserting part 20 is arranged outside the sleeve 531, and the structure is more hierarchical and more optimal.

Preferably, the main support keel 1 is further provided with an outer protective sleeve 54 capable of covering the driving gear set protective cover 53 and the socket 531. To further improve the protection and the aesthetic appearance of the exterior, the protecting cover 53 of the driving gear set and the sleeve 531 are integrally connected as described above, so that the outer protecting cover 54 may have an overall structure similar to the overall structure formed by the protecting cover 53 of the driving gear set and the sleeve 531, and may have a substantially L-shaped structure, but the front side surface and the peripheral portion of the outer protecting cover 54 may be modified better, and may have more streamline structures, because the detailed shape of the protecting cover 53 of the driving gear set may have a structure of a gear, a spring, etc. due to the covering position, so that corresponding convex and concave structures may be formed for the adaptation, and it is also important that the front end of the front and rear position adjusting shaft 5 generally extends forward beyond a portion of the upper gear for better installation and axial positioning of the upper gear, the part of the front end of the front and rear position adjusting rotating shaft 5 beyond the front end can pass through the driving gear set protecting cover 53 to ensure the compactness of the internal structure, corresponding holes are required to be formed in the driving gear set protecting cover 53 to enable the front end of the front and rear position adjusting rotating shaft 5 to penetrate through the front end of the front and rear position adjusting rotating shaft to avoid the front end of the front and rear position adjusting rotating shaft, the internal structure is exposed, and the front and rear position adjusting rotating shaft can be better protected and can be covered through the outer protecting sleeve 54 to improve the attractiveness. The outer protective sleeve 54 is preferably secured to the main support keel 1 by conventional means such as clips and the like. The protective cover 53 and the outer protective sleeve 54 of the driving gear set can be made of plastic, such as PA6+33% glass fiber plastic.

In addition, for better front and back adjustment, a front and back adjustment guide post 222 which extends backwards into the inner cavity 21 of the bottom of the front support keel and is close to the front side of the connecting rotating shaft 52 is embedded and arranged in the front side part of the insertion part 20 at the bottom of the front support keel, a guide groove which is formed by extending forwards and backwards is formed in the front end part of the connecting rotating shaft 52, and the guide groove can be used for the rear insertion and matching of the front and back adjustment guide post 222. Also, the front-rear position adjusting shaft 5 and the connecting shaft 52 are extended forward and rearward and slightly raised upward and forward by an angle of as small as possible within 10 degrees, or even within 5 degrees, because the seat itself is sometimes slightly raised by some degrees for the comfort of use.

Preferably, the front supporting keel 2 has a middle arc supporting section 23 formed with a section arched in a forward arc in the section above the bottom inserting section 20 of the front supporting keel, which improves the strength of forward support because the waist of the human body is leaned backwards, and the structure is more optimized.

Further, in the above-mentioned structure, the front support keel 2 is connected with the main support keel 1 through a bottom structure, if only there is connection, the whole support structure is unstable, and the front-rear position limitation of the front support keel 2 is insufficient, so that further optimization is required, as follows:

the part of the front support keel 2 above the middle arc-shaped support section 23 is used as an upper side adjusting connecting section 24, and the upper side adjusting connecting section 24 is movably connected with the main support keel 1 in the front and back. Through the connection of the upper front support keel 2 and the main support keel 1, the strength of the connection between the front and the rear can be ensured, the stability is improved, and the connection between the upper front support keel and the lower front support keel is preferably movable to adapt to the lower front and rear adjustable connection structure because the connection between the lower front support keel and the lower front support keel is that the bottom structure of the front support keel 2 can be adjusted and moved back and forth. On this basis, specifically, the rear side of the upper side adjusting connecting section 24 is fixedly connected with an upper supporting reinforced connecting shaft rod 251 which extends backwards, the upper supporting reinforced connecting shaft rod 251 is connected with the main supporting keel 1 through a universal connecting mechanism, the universal connecting mechanism can adopt an existing universal joint structure, but the universal connecting mechanism is applied to a chair, does not need a too complex mechanical structure, and can adopt a simpler universal structure as follows:

the universal connection mechanism comprises a universal ball head 252 fixed at the rear end of the upper support reinforcing connection shaft 251 and a ball cage 19 arranged on the main support keel 1 and used for installing and connecting the universal ball head 252, a movable inner bin 191 used for movably placing the universal ball head 252 in is formed in the ball cage 19, an inner bin outlet 192 of the movable inner bin 191 is opened forwards, the diameter of the inner bin outlet 192 is smaller than that of the universal ball head 252, a part of the universal ball head 252 is exposed out of the movable inner bin 191 forwards, and the diameter of the rear end of the upper support reinforcing connection shaft 251 is smaller than that of the inner bin outlet 192. The inner chamber outlet 192 is preferably a circular outlet, and the design of the above dimensions can make the upper supporting reinforcing connecting shaft 251 flexibly run around the ball cage 19, wherein the ball cage 19 is preferably a structure capable of being spliced and fixed, for example, the main body part of the ball cage 19 is formed on the main supporting keel 1, but the rear side of the main body part is not closed, and the ball cage is closed on the rear side of the main supporting keel 1 by a structure that a rear ball cage cover 190 can be detachably arranged on the main body part by screws and the like, so that the design can make the upper supporting reinforcing connecting shaft 251 pass through the ball cage and the inner chamber outlet 192 from the position where the rear side of the ball cage is not sealed and the front and rear side installation and fixation can be completed by the universal ball head 252 being arranged into the ball cage from the rear to the front, because the upper supporting reinforcing connecting shaft 251 and the universal ball head 252 are usually in an integrally connected structure, this design is more adaptable because it is a single component that is installed, and in this example the upper support stiffening connecting shaft 251 and the universal ball head 252 are preferably integrally formed of plastic, such as POM plastic. And the connection structure of the universal joint is always connected, the adjustment of the front and back positions of the bottom of the front support keel 2 can be effectively limited, and the plasticity of the keel and the plastic connecting piece is limited, for example, under the condition that the bottom of the front support keel 2 moves a lot of before, the structures of the front support keel and the upper universal connection part can not meet the deformation capacity required by the overlarge forward movement component, and the limitation of the front and back adjustment can be avoided.

Through the design of above-mentioned structure, just can make the back of the chair not only left and right rocking pendulum, can also make back of the chair subassembly longitudinal adjustment, satisfy user's different demands, the operation is also simpler, as long as just can easily adjust front and back position through the hand wheel, it is also very convenient that the operation also can be seen through embodiment 1 to the function of rocking pendulum in left and right sides in addition to the compatibility of two kinds of functions is better, makes overall structure's compactness and intensity all promoted better.

Of course, based on the above-mentioned swingable backrest structure, the present embodiment also provides a chair including the aforementioned swingable backrest structure, and the swingable backrest structures mentioned in

embodiments

1 and 2 can be adopted and used in combination.

Embodiment 3, referring to the drawings of embodiment 1, a headrest structure of this embodiment can be applied to the chair structures of

embodiments

1 and 2, and can be used together with a swingable backrest structure and the like in the same chair, so that the effect is better.

Specifically, the headrest structure of the present embodiment includes an upper support frame 6 in an upright shape for being mounted and connected to the front support frame 2, the upper support frame 6 is in an upright shape and may be integrally formed by a plastic material, an upper end portion of the upper support frame 6 is connected to an upper support beam 61 which rotates around the upper support frame 6 and is in a horizontal shape, that is, the upper support frame 6 and the upper support beam 61 are rotatably connected, a front side portion of the upper support beam 61 is connected to a headrest body assembly which can rotate around the upper support beam 61 and is used for leaning on the head, the upper support beam 61 and the headrest body assembly are also rotatably connected, further, a rotation seat 62 for being connected to the upper support frame 6 is installed at a lower side of the upper support beam 61, that is, the rotation connection of the upper support beam 61 and the upper support frame 6 is connected by the rotation seat 62, and the upper support beam 61 can perform a front-back position adjustment movement along the rotation seat 62, go up supporting beam 61 like this and can not only rotate from top to bottom, make the holistic angle of headrest body subassembly obtain the rotation regulation, go up the back-and-forth movement of supporting beam 61, make the holistic front and back position of headrest body subassembly can obtain the regulation, it is exactly that headrest body subassembly rotates round last supporting beam 61 makes when headrest body subassembly follows supporting beam 61 after angle adjustment on a large scale, can also further finely tune in order to satisfy user's head and rely on more comfortable position selection.

Specifically, a left rack 601 and a right rack 602 which are spaced from each other and symmetrical are formed at the lower part of the upper support beam 61, the left rack 601 has a plurality of left-side inverted teeth 6011 continuously arranged in front and rear directions and inclined to the right and rear directions and forms a left-side inverted tooth limiting groove 60111, the right rack 602 has a plurality of right-side inverted teeth 6021 inclined to the left and rear in a front-rear continuous arrangement and forming a right-side inverted tooth stopper 60211, an upwardly extending positioning pile 621 is installed in the rotating seat 62, an elastic positioning clip 622 for adjusting the front and rear positions of the upper supporting beam 61 is sleeved on the positioning pile 621, the resiliently positioning clip 622 includes clip left and right extending clip return springs 6220 respectively provided between and cooperating with the left and right inverted

tooth limiting grooves

60111 and 60211, respectively, to enable the upper support beam 61 to be adjusted forward and backward and limited in position. In this structure, the elastic positioning clip 622 is mounted and positioned on the rotating base 62, the elastic positioning clip 622 does not move back and forth relative to the rotating base 62, and the position of the elastic positioning clip 622 moving back and forth relative to the upper supporting beam 61 is actually the clip channel 661122 for the elastic positioning clip 622 to be inserted at the interval between the left rack 601 and the right rack 602, or at the interval between the left inverted tooth limiting groove 60111 and the right inverted tooth limiting groove 60211, that is, the lower part of the upper supporting beam 61 is formed at the interval between the left rack 601 and the right rack 602, because the racks and the corresponding inverted tooth limiting grooves are arranged at both sides of the clip channel 661122, and the design of the inverted tooth shape is adopted, the left and right side parts of the elastic positioning clip 622 move back relative to the upper supporting beam 61 and form a position lock position, and because of the elastic clip return spring 6220 between the left and right sides, the elastic positioning clip 622 can continuously do the actions of folding, backing and unfolding for stopping along the inverted teeth, and the actions are realized by operating the upper supporting beam 61 to push forwards, and the upper supporting beam 61 can be adjusted forwards relative to the elastic positioning clip 622 and can form the clamping position when the elastic positioning clip 622 stops due to each group of left inverted teeth 6011 and right inverted teeth 6021 which are opposite left and right, namely the forward adjustment of the upper supporting beam 61 needs to overcome the elastic force of the clip return spring 6220 on the elastic positioning clip 622 to complete the forward position adjustment, but the inverted teeth have the limitation that the upper supporting beam 61 can not move backwards and retreat relative to the elastic positioning clip 622 under the structure, namely can not move backwards and retreat relative to the rotating seat 62 and the front supporting keel 2, so how to enable the upper supporting beam 61 to move backwards and retreat relative to the elastic positioning clip 622 and then can have a further design, or other structure that allows the resilient retaining clip 622 to collapse, allows the upper support beam 61 to be easily retracted rearwardly relative to the resilient retaining clip 622.

Next, we will describe the structure of the above upper support beam 61 for forward adjustment in detail: the left part of the clamp comprises a left rotary base plate 6221 of the clamp sleeved on the positioning pile 621, and a left clamping plate 6222 which is integrally connected with the left rotary base plate 6221 close to the left and can extend into the left inverted tooth limiting groove 60111 towards the left front, the right part of the clamp comprises a right rotary clamp plate 6223 sleeved on the positioning pile 621 and a right clamping plate 6224 integrally connected to the right part of the right rotary clamp plate 6223 and capable of extending into the right inverted tooth limiting groove 60211 towards the front right, the left rotary clamp plate 6221 and the right rotary clamp plate 6223 can adopt a round cake-shaped structure and be in a flat laying state, the left clamping plate 6222 and the right clamping plate 6224 are preferably in a strip-shaped structure, because left-hand catch plate 6222 and right-hand catch plate 6224 are the portions of the clip that directly engage the inverted teeth, both the left-hand portion of the clip and the right-hand portion of the clip can be integrally formed of plastic.

Further, the clip return spring 6220 is sandwiched between the left and right

side catch plates

6222 and 6224, the structure is similar to that of the prior elastic clips, namely the difficulty of folding the clip is improved, so that the clip is preferentially kept in an open state, in particular, in this embodiment, the resilient positioning clip 622 resiliently presses the left-side catch plate 6222 and the right-side catch plate 6224 into the grooves formed by the inverted teeth when not adjusted, i.e., by the resiliency of the spring, in the case where the upper support beam is pushed forward without pushing force, the elastic positioning clips 622 keep the upper support beam 61 in a stationary state, when the upper support beam 61 is pushed forward, the left-side catch plate 6222 and the right-side catch plate 6224 are pressed and gathered a little toward the middle by the saw teeth, but at this time, the gathering degree is not large and the gathering state is unstable, the upper support beam 61 is adjusted and positioned forward because it will expand to form a detent to the next serration.

Further, the right side position of the left side cardboard 6222 is integrally connected with a left sleeve terminal 62220 for sleeving the left end inner ring of the clip return spring 6220, and the left side position of the right side cardboard 6224 is integrally connected with a right sleeve terminal 62240 for sleeving the right end inner ring of the clip return spring 6220, so that the mounting stability of the clip return spring 6220 is improved, and the better work of the clip return spring 6220 is ensured. Preferably, a left spring end limiting groove 62221 is further formed in the right side of the left side catch plate 6222, the left spring end limiting groove 62221 is located in the periphery of the left sleeve terminal 62220 and used for placing the left end of the clip return spring 6220, a right spring end limiting groove 62241 is further formed in the left side of the right side catch plate 6224, the right spring end limiting groove 62241 is located in the periphery of the right sleeve terminal 62240 and used for placing the right end of the clip return spring 6220, the left spring end limiting groove 62221 and the right spring end limiting groove 62241 are located in the periphery of the spring end, and positioning of the end of the clip return spring 6220 is further improved, so that reliability of the structure is guaranteed. In addition, the clip left-side rotating base 6221 and the clip right-side rotating base 6223 are stacked in the vertical direction, and a scissors or the like can be used here, so that the clip left-side rotating base 6221 and the clip right-side rotating base 6223 are stacked by some step structure or other structure which can be nested up and down to ensure that the left-side catch plate 6222 and the right-side catch plate 6224 are at the same horizontal position, because the aforesaid left-side rack 601 and the right-side rack 602 are preferably at the same horizontal position. While the spud 621 is simultaneously passed up through the left hand swivel base 6221 and the right hand swivel base 6223 of the clip, and preferably the three are concentric.

Preferably, the lower portion of the upper support beam 61 is recessed upward at a position spaced between the left rack 601 and the right rack 602 to form a front and rear linear rectangular groove 66 extending forward and rearward, that is, the front and rear linear rectangular grooves 66 are formed on the upper side of the clip channel 661122 and are communicated with each other vertically, and a rectangular positioning guide plate 63 for guiding the front and rear linear rectangular grooves 66 forward and rearward is embedded in the front and rear linear rectangular grooves 66, that is, the upper support beam 61 can better have a linear forward and rearward guiding effect along the rectangular positioning guide plate 63 by forming the front and rear linear rectangular grooves 66, and the rectangular positioning guide plate 63 is formed with a positioning hole 630 penetrating vertically and allowing the positioning pile 621 to be inserted and mounted upward, that is, the positioning pile 621 also penetrates upward through the rectangular positioning guide plate 63, and the holes for allowing the positioning pile 621 to penetrate upward are preferably single circular holes formed in the left rotary base plate 6221 of the clip and the right rotary base plate 6223 of the clip The structure and diameter of the positioning posts 621 are equal or almost equal, so that the left-side rotating base plate 6221 and the right-side rotating base plate 6223 of the clamp do not move horizontally relative to the positioning posts 621 in an equal manner, and if the positioning holes 630 are also of a single circular hole structure, the rectangular positioning guide plate 63 does not move horizontally relative to the positioning posts 621, so as to make the upper support beam 61 move linearly back and forth along with the front and rear linear rectangular grooves 66 in a better manner. However, in order to enable the upper support beam 61 to retract after being adjusted forward to achieve back and forth adjustment of the front and rear positions, the structure including the positioning hole 630 is designed as follows:

the positioning hole 630 includes a front circular portion 6301 and a rear circular portion 6302 spaced from each other in a front-rear direction, and a contraction portion 6303 communicating between the front circular portion 6301 and the rear circular portion 6302, the diameter of the front circular portion 6301 and the diameter of the rear circular portion 6302 are the same or nearly the same as the diameter of the positioning post 621, the contraction portion 6303 is rectangular and has a smaller distance between the left and right than the diameter of the positioning post 621, the portion of the rectangular positioning guide plate 63 located in the positioning hole 630 is a plastic portion, left and right spaced apart strips 6311 and right spaced apart 6312 are integrally connected to the lower surface of the rectangular positioning guide plate 63 and located on the left and right sides of the elastic positioning clip 622 respectively, and can fold the elastic positioning clip 622 when the positioning post 621 is inserted into the rear circular portion 6302 from the front circular portion 6301, the left gathering bar 6311 and the right gathering bar 6312 extend back and forth. The left gathering stop 6311 abuts against the left outer root of the left catch plate 6222, the right gathering stop 6312 abuts against the right outer root of the right catch plate 6224, and when the spud 621 is installed in the front circular portion 6301 at the time of initial installation, the elastic positioning clip 622 is in an open state, if the spud 621 enters the rear circular portion 6302 through the contracting portion 6303 by horizontal force, the elastic positioning clip 622 is in a gathered state, when the upper support beam 61 is adjusted by pushing forward from the rear direction, when the rectangular positioning guide plate 63 is in the middle position from the front to the rear in the front and rear linear rectangular slots 66, the pushing is smooth, the pressing friction force on both sides of the elastic positioning clip 622 is ensured not to push the spud 621 from the front circular portion 6301 into the rear circular portion 6302, of course, the surface of the contact portion needs to be smooth in order to reduce the friction force, at this time, the positioning pile 621 is located in the front circular portion 6301 and the contracted portion 6303 restrains the positioning pile 621, but after the upper supporting beam 61 moves forward all the time, the rear side wall of the front and rear linear rectangular slots 66 finally abuts against the rear side portion of the rectangular positioning guiding plate 63, and then the upper supporting beam 61 is pushed forward by the force, so that due to the design of the positioning hole 630 and the plastic property of the rectangular positioning guiding plate, the contracted portion 6303 can be deformed and expanded by the external force, that is, the positioning pile 621 forms a larger force to support the contracted portion 6303 apart and pass through the contracted portion 6303, and then enter the rear circular portion 6302, and due to the lever force formed by the abutting of the left folding bar 6311 and the right folding bar 6312, the left clamping board 6222 and the right clamping board 6224 are retracted to the left and right middle, that is, the clip is folded and wrapped between the left folding bar 6311 and the right folding bar 6312, the clip is folded completely and stably, so that the upper support beam 61 can return to the last position without being affected by the elastic positioning clip 622, and the adjustment of the forward position is performed again, so that the process can be repeated, and the adjustment of each position can be repeatedly performed. The design that the part of the rectangular positioning guide plate 63 located in the positioning hole 630 is a plastic part is necessary, and certainly, the rectangular positioning guide plate 63 can also be integrally formed by plastic, in addition, in order to improve the plasticity of the positioning hole 630, plastic lifting grooves 63000 which are penetrated up and down can be respectively arranged on two sides of the positioning hole 630, the plastic lifting grooves 63000 can be wavy, or the plastic lifting groove 63000 on the left side is similar to the shape of the left half of the positioning hole 630, the plastic lifting groove 63000 on the right side is similar to the shape of the right half of the positioning hole 630, and by planing off materials, the plasticity of the part around the positioning hole 630 is larger, so that the positioning pile 621 is reliable when being pushed through.

Furthermore, a front transitional opening area 6000 is formed at the lower part of the upper support beam 61, which is located in front of the left-side inverted tooth limiting groove 60111 and the right-side inverted tooth limiting groove 60211, and is used for placing the left-side catch plate 6222 and the right-side catch plate 6224 when the elastic positioning clip 622 opens after the part of the positioning pile 621 inserted into the positioning hole 630 enters the front circular part 6301 from the rear circular part 6302. This design follows the previous design because after the spud 621 is in the rear circular portion 6302, the upper support beam 61 can be retracted smoothly, but when the upper support beam 61 is retracted to a very rear position, the front portion of the rectangular positioning guide plate 63 will also abut against the front wall of the front linear rectangular groove 66, and at this time, the upper support beam 61 is pushed rearward by the force, and the rectangular positioning guide plate 63 will follow the upper support beam 61 to move forward by a certain amount and return the spud 621 to the front circular portion 6301, and at this time, the resilient positioning clip 622 will be opened, which is equivalent to the operative state of the resilient positioning clip 622 when it is adjusted forward, and a recovery area for putting in and putting in the folded state of the left-side catch plate 6222 and the right-side catch plate 6224 of the resilient positioning clip 622 is provided in the front transition open area 6000 in front of the clip channel 661122, is a preparation area for the next forward adjustment process to suggest that forward adjustment of the upper support beam 61 is a repeatable process. The whole design does not cause the problem that the front adjustment cannot be carried out and the back adjustment cannot be carried out, and the position can be repeatedly adjusted and positioned at any position.

In addition, the installation of the rotating base 62, the upper supporting beam 61 and the upper supporting keel 6 is described simply, the rotating base 62 can be a double-lug hinge base, and is arranged in an inverted manner, the hinge part of the rotating base 62 is arranged below and is inserted with the hinge part of the upper end of the upper supporting keel 6 to form a single lug, and the single lug hinge part is connected in series from left to right through a hinge shaft, the axial direction of the hinge shaft is in the left-right direction, and in order to improve the position after the rotation to have a certain degree of stability, the friction damping sheets 6006 sleeved on the hinge shaft are arranged at the left-right close interval of the hinge part of the rotating base 62 and the upper supporting keel 6 after the insertion, of course, the damping type rotating connection mode is a more conventional existing design, of course, other existing damping type rotating connection structures can be adopted, mainly for the purpose of rotating, but the rotating requires a larger force, and the position after the rotating is ensured to have a certain degree of stability, cannot be easily turned and cannot be loosened during use, so that on the one hand the adjustment is possible and on the other hand the structure is available on many pieces of furniture or machinery for safety and comfort during use. Also, the connection between the front side portion of the upper support beam 61 and the headrest body assembly can be made by such a damped rotational connection structure, so that the headrest body assembly can finely adjust the angle up and down around the front side portion of the upper support beam 61, the axial direction of the hinge shaft provided therebetween is also the left-right direction, but here, since the headrest main body assembly and the upper support beam 61 are simply rotated, therefore, a hinge portion or an existing hinge seat may be directly formed at the front side portion of the upper support beam 61, and a corresponding hinge portion or an existing hinge seat may be directly formed at the rear side portion of the headrest body assembly, so that the front side portion of the upper support beam 61 and the corresponding hinge structure at the rear side portion of the headrest body assembly may be connected in series by the hinge shaft, and the friction damping plate 6006 may be provided. It should be noted that the pivoting portion 62 is preferably hinged to the upper support frame 6, or the pivoting portion of the upper support beam 61 is preferably hinged to the headrest body assembly with limited range, and the pivoting portion of the upper support beam 61 is preferably hinged to the headrest body assembly with adjustable range, so that the existing design can be adopted, for example, a pivoting stop 6666 extending in the left-right direction and protruding in the upward arc shape is formed on the upper end of the upper support frame 6, a slot 6667 for the pivoting stop 6666 to be adjusted and inserted can be formed on the pivoting portion of the pivoting portion 62, a stop portion 6668 for stopping the pivoting stop 6666 from rotating in the circumferential direction can be formed on the pivoting portion of the pivoting portion 62, and the pivoting stop 6666 and the headrest body assembly can be formed on the pivoting portion of the upper support beam 61, The gear grooves, the blocking parts and the like mainly enable the rotation to be adjustable and limited, and other existing structures are feasible and are not described in detail herein.

The mounting connection between the rotating base 62 and the upper support beam 61 can be further optimized, the rotating base 62 is arranged upside down, the upper part is a part of the base support and the lower part is a hinged part, in order to better enable the upper support beam 61 to be adjusted back and forth on the rotating base 62 and ensure the connectivity between the structures, the rotating base 62 is on the base support of the upper part of the rotating base 62, namely the base support part of the double-lug type hinge base, the common base support part of the rotating base 62 is a rectangular block-shaped structure, a dovetail mounting groove t1 which extends through from front to back and the top of which is communicated with the outside is arranged on the upper surface of the base support part, the cross section of the dovetail mounting groove t1 vertical to the front and back direction is in an isosceles trapezoid shape, and the front and back through is convenient for the upper support beam 61 to move back and forth, the upper side of the dovetail mounting groove t1 is opened and the distance between the left and right groove walls of the dovetail mounting groove t1 is gradually reduced from bottom to top to form a slope structure, the peripheral contour of the lower part of the upper support beam 61 is matched with the groove shape of the dovetail mounting groove t1, the lower part of the upper support beam 61 forms a dovetail t2, the left and right racks, the left and right inverted tooth limiting grooves, the front and rear linear rectangular grooves 66, the front transition open area 6000 and the clip channel 661122 are formed in the dovetail t2, the positioning peg 621 is inserted and positioned in the groove bottom of the dovetail mounting groove t1 of the rotating seat 62 and cannot move horizontally, here, in order to smoothly mount the positioning peg 621 and the rotating seat 62, the rotating seat 62 base supporting part and the hinge part are divided into two structures which are spliced up and down and respectively a rotating seat base supporting part j1 and a rotating seat hinge part 2, then, during installation, the rectangular positioning guide plate 63 is first placed into the front and rear linear rectangular grooves 66, the elastic positioning clip 622 is placed on the lower side of the rectangular positioning guide plate 63 and is clamped in the clip channel 661122, the upper support beam 61 carries the rectangular positioning guide plate 63 and the elastic positioning clip 622 to be forwardly inserted into the dovetail mounting groove t1 formed in the rotating seat base support portion j1 of the rotating seat 62 through the dovetail portion t2, due to the arrangement of the groove type, the upper support beam 61 cannot move up and down relative to the rotating seat base support portion j1, the positioning pile 621 is then upwardly inserted from the bottom of the rotating seat base support portion j1 and is upwardly inserted through the bottom of the dovetail mounting groove t1 until the positioning pile 621 upwardly and simultaneously inserted into the corresponding hole positions of the elastic positioning clip 622 and the rectangular positioning guide plate 63, and finally, the rotating seat base support portion j1 and the rotating seat hinge portion j2 are connected through bolts or are transversely inserted into wedge blocks, and other detachable fixing holes are formed The installation is performed in a splicing manner, the lower end of the positioning pile 621 is abutted against the junction part of the top of the hinge part j2 of the rotating seat or after the positioning pile 621 is upwards penetrated, the bottom of the base supporting part j1 of the rotating seat is provided with a filling piece to abut against the lower end of the positioning pile 621. In this way, the headrest can be smoothly mounted, and the front-rear position and the vertical angle of the headrest can be appropriately adjusted.

On the other hand, the headrest is preferably adjustable in height, the structure can be realized in the existing manner and is realized in the connecting structure of the front support keel 2 and the upper support keel 6, the lower part of the upper support keel 6 forms a fully-enclosed or fully-enclosed surrounding frame 6k, the surrounding frame 6k forms a passage extending in the up-down direction, the front support keel 2 is penetrated with the surrounding frame 6k through the passage of the surrounding frame 6k, for example, the upper side adjusting connecting section 24 of the front support keel 2 is penetrated, the front part of the upper side adjusting connecting section 24 of the front support keel 2 forms upper and lower gear adjusting grooves 2s arranged at intervals in the up-down direction, the upper and lower gear adjusting grooves 2s can be circular arc-shaped concave grooves, and the rear part of the upper support keel 6 is embedded with upper and lower gear adjusting columns 6s capable of abutting against the upper and lower gear adjusting grooves 2s, the upper and lower gear adjusting columns 6s are extended forward and backward, the rear side parts of the upper and lower gear adjusting columns 6s are preferably arc-shaped structures, so as to be better matched with the upper and lower gear adjusting grooves 2s, and based on the above structure, the upper and lower gear adjusting columns 6s preferably adopt structures such as wave ball screws or wave ball springs, for example, wave ball screws, which are derivative products of fastening screws and are composed of springs, steel balls and shells, and the steel balls are exposed to one part, wherein the steel balls can be just used as the rear side parts of the upper and lower gear adjusting columns 6s and are also spherical, so as to be better matched with the upper and lower gear adjusting grooves 2s, and meanwhile, due to the springs extending forward and backward inside, the steel balls are elastic, when the upper supporting keel 6 is adjusted in the up and down direction of the front supporting keel 2, the steel balls can be retracted forward for a certain distance, so that the upper supporting keel 6 can conveniently move up and down, then when the position of the corresponding upper and lower gear adjusting grooves 2s is reached, the steel balls can be ejected backwards and abutted against the upper and lower gear adjusting grooves 2s, if the upper supporting keel 6 is pushed up and down without force, the upper and lower gear adjusting columns 6s are in place and positioned in the upper and lower gear adjusting grooves 2s without moving up and down, so the connecting structure is convenient for the upper supporting keel 6 to drive the headrest assembly to adjust and position up and down.

This embodiment also provides a chair including the headrest structure described above, but of course, this chair continues to employ the swingable backrest structure of

embodiments

1 and 2.

Embodiment 4, referring to the drawings in embodiment 1, a headrest structure of this embodiment is a further optimization of the headrest structure of embodiment 3, and can be used on the basis of the basic structure of embodiment 3, or can be used alone.

Specifically, this headrest structure is including being used for supplying the headrest main part subassembly that the head leaned on, headrest main part subassembly include well headrest and well headrest left and right sides be connected with respectively and can round well headrest left part left and right sides pivoted left headrest with can round well headrest right side part left and right pivoted right headrest, left side headrest pass through left side hinge 71 with well headrest left part articulates and connects, right side headrest pass through right side hinge 72 with well headrest right side part articulates and connects, left side hinge 71 is located the outside of well headrest, right side hinge 72 also is located the outside of well headrest. The headrest through three left-middle-right designs can better cladding the head, let the head obtain better cladding, the axial of the articulated shaft of left side hinge 71 and right side hinge 72 is upper and lower direction, let left side headrest and right headrest all in the horizontal direction horizontal hunting can, cladding to the head is mainly in the horizontal side, additionally, left side hinge 71 and right side hinge 72 are in the outside of well headrest, also can make things convenient for the hinge and control the change maintenance etc. of headrest, because they are the part that can often move about, relatively speaking easy problem appears.

Preferably, the middle headrest comprises a front middle headrest base plate a1 and a rear middle headrest frame a2 which are spliced front and back, and a middle headrest foam cushion a3 fixed on the front side surface of the front middle headrest base plate a1, the front middle headrest base plate a1 and the rear middle headrest frame a2 can be made of plastic materials and spliced by the existing methods such as buckles or screw threads to form the whole basic structure of the middle headrest, and the inside of the basic structure is hollow, so that a good pillow shape structure can be formed, and then the middle headrest foam cushion a3 can be comfortably used, similarly, the left headrest comprises a front left headrest base plate b1 and a left headrest rear frame b2 which are spliced front and back, and a left headrest foam cushion b3 fixed on the front side surface of the front left headrest base plate b1, the right headrest comprises a front right headrest base plate c1 and a right headrest rear frame c2 which are spliced front and back, and a right headrest foam cushion c3 fixed on the front side surface of the front right headrest base plate c1, the three headrests can adopt the same structural design concept. For the requirement of installation, the splice position department of the well headrest left and right sides is formed with first installation mouth a01 and second installation mouth a02 respectively, and first installation mouth a01 and second installation mouth a02 are just the erection joint who makes things convenient for interior outer structure, specifically, well headrest pass through left headrest connecting seat with left side hinge 71 connects, well headrest pass through right headrest connecting seat with right side hinge 72 connects, left headrest connecting seat includes that at least the left side has some to stretch out first installation mouth a01 and fixes left first board a211 on well headrest rear frame a2 front side position and the left side of left first board a211 stretches out the part of first installation mouth a01 and is connected forward and be located the left second board a212 that is used for installing left side hinge 71 that the headrest left side first board a212 that the left side is connected to the left side of left headrest that the left side stretches out the portion of first installation mouth a01, right headrest connecting seat includes that at least the right side has some to stretch out second installation mouth a02 and fix right headrest first board a221 and right side board a221 and fix on well headrest rear frame a2 front side position The right side of the right first plate a221, which extends out of the second mounting opening a02, is integrally connected with a part which extends forwards and is positioned on the right side of the middle headrest, and the right second plate a222 of the right hinge 72 is used for mounting.

Preferably, one hinge leaf of the left hinge 71 is fixed on the left second plate a212, the other hinge leaf of the left hinge 71 extends into the left headrest as the left movable leaf 710 and is fixed with the left headrest, a corresponding mounting opening is formed after the right side of the left headrest is spliced so that the left movable leaf 710 extends into the left headrest for fixing, the left movable leaf 710 can be fixed on the rear side of the left headrest front base plate b1, namely on the side of the left headrest front base plate b1 leaning against the inside of the left headrest, of course, the left movable leaf 710 can also be fixed on the front side of the left headrest rear frame b 2; one hinge blade of the right hinge 72 is fixed to the right second plate a222, the other hinge blade of the right hinge 72 extends into the right headrest as a right movable blade 720 and is fixed to the right headrest, a corresponding mounting opening is formed after the left side of the right headrest is spliced, the right movable blade 720 extends into the mounting opening to be fixed, the right movable blade 720 can be fixed to the rear side of the right headrest front base plate c1, namely, to the side of the right headrest front base plate c1 close to the right headrest, and of course, the right movable blade 720 can also be fixed to the front side of the right headrest rear frame c 2. By the design, the left headrest and the right headrest can smoothly rotate left and right to be adjusted.

Of course, for the rotation amplitude control, the following modifications are made: a left rotation limiting plate a213 extending leftward and limiting the left movable blade 710 to rotate leftward and rearward is integrally connected to a front portion of the left second plate a 212. The front part of the right second plate a222 is integrally connected with a right rotation limiting plate a223 which extends rightwards and is used for limiting the right movable blade 720 to rotate rightwards and backwards. The left rotation restriction plate a213 and the right rotation restriction plate a223 are both for preventing excessive backward rotation.

Furthermore, at least one part of the left second plate a212 is also arranged in the left headrest, and at least one part of the right second plate a222 is also arranged in the right headrest, so that the mechanical structure is less exposed, and a better protection effect and a better aesthetic degree are achieved.

In order to better protect and cover the left headrest connecting seat and the right headrest connecting seat, a left rear shielding protection plate a100 close to the rear side of the left headrest connecting seat can be fixed on the front side of the middle headrest rear frame a2, the left rear shielding protection plate a100 can be wrapped on the left and right side of the left headrest connecting seat and fixed on the front side of the middle headrest rear frame a2, the outer surface part of the left rear shielding protection plate a100 at the left rear side is a 90-degree arc surface, the structure is similar to a fillet, a reinforcing rib can be formed on the wrapping part of the left rear shielding protection plate a100 to abut against the left headrest connecting seat, the left headrest connecting seat is shielded and more attractive in appearance better at the rear side, and similarly, a right rear shielding protection plate a200 close to the rear side of the right headrest connecting seat is further fixed on the front side of the middle headrest rear frame a2, and the right rear shielding protection plate a200 and the left rear shielding protection plate a100 are arranged in a left-right mirror mode and matched with the right headrest connecting seat. The two shielding protection plates can also be processed by plastic.

Preferably, the left side hinge 71 is a damped hinge, and the right side hinge 72 is a damped hinge. Therefore, the left headrest and the right headrest rotate left and right only by applying certain strength, and can be stably supported against the head without applying strength, so that the pillow has better comfort and safety, and is not uncontrollable and easy to rotate.

The installation of the entire headrest assembly on the chair is also easy, as in the installation manner mentioned in embodiment 3: therefore, the front side of the upper support beam 61 can be directly hinged or fixed with an existing hinged seat, the rear side of the headrest body assembly can be directly hinged or fixed with an existing hinged seat, then the front side of the upper support beam 61 and the corresponding hinged structure on the rear side of the headrest body assembly are connected in series through the hinged shaft, and the friction damping sheet 6006 can be also arranged. Particularly, in conjunction with the functions of back swing and front-rear position adjustment as mentioned in the previous embodiments, the pivoting structure of the left and right headrests in the headrest assembly can better match these functions and also adjust the position of the human body to maintain a very good comfort level.

Of course, the present embodiment also provides a chair including the headrest structure.

Embodiment 5, referring to the drawings in embodiment 1, an armrest structure is provided, and the armrest structure of this embodiment can be applied to the aforementioned chairs, and used in combination, or used alone in other existing chairs.

Specifically, the armrest structure comprises an armrest assembly, wherein the armrest assembly comprises an armrest outer sleeve f, an armrest lifting keel f1 vertically penetrating through the armrest outer sleeve f and capable of being adjusted vertically on the armrest outer sleeve f, an armrest base supporting plate f2 mounted at the top of the armrest lifting keel f1, an armrest left-right moving guide seat f3 capable of moving left and right and an armrest main body part capable of driving the armrest left-right moving guide seat f3 to move left and right and capable of moving horizontally around the armrest left-right moving guide seat f3 and allowing a hand to lean against. The armrest housing f can be directly mounted on the seat or the back of the chair, so that the armrest structure can be used on the chair. The armrest outer sleeve f, the armrest lifting keel f1, the armrest base supporting plate f2 and the armrest left-right moving guide seat f3 can be integrally molded and processed by plastic materials. The armrest riser f1 is preferably a three-dimensional T-shaped structure or inverted L-shaped structure with a hollow interior to form a basic armrest support structure. The handrail base supporting plate f2 is laid flat and fixed on the top of the handrail lifting keel f1 by means of clamping or screw fixation and the like, and covers the hollow area inside the handrail lifting keel f1, the upper surface of the handrail base supporting plate f2 needs to be as smooth as possible, so that when the handrail main body part moves horizontally on the handrail base supporting plate f2, a large frictional resistance cannot be generated. Through the design of the armrest left-right moving guide seat f3, the armrest left-right moving guide seat f3 is used as a moving center, on one hand, the armrest main body part and the armrest left-right moving guide seat f3 can move together in a public mode, namely, move left and right, on the other hand, the armrest main body part can also do actions which are not left and right translation, such as rotation and the like relative to the armrest left-right moving guide seat f3, and therefore the position adjusting movement of the armrest main body part is more diversified.

Specifically, the armrest main body portion can move back and forth along the armrest left-right movement guide seat f3 and can also horizontally rotate around the armrest left-right movement guide seat f3, that is, in addition to the common left-right translation motion of the armrest main body portion and the armrest left-right movement guide seat f3, the armrest main body portion can rotate around the armrest left-right movement guide seat f3 and move back and forth in a regulating manner relative to the armrest left-right movement guide seat f3, so that the adjustability of the armrest is further improved.

Further, the handrail left-right moving guide seat f3 comprises a handrail left-right moving guide plate f31 placed in the lower surface of the handrail base support plate f2 and a handrail left-right moving guide center post f32 integrally connected to the upper portion of the handrail left-right moving guide plate f31 and penetrating through the handrail base support plate f2, the handrail base support plate f2 is provided with a handrail left-right moving through hole f21 which penetrates through the handrail left-right moving guide center post f32 up and moves left and right for adjustment, the handrail left-right moving through hole f21 is a strip-shaped hole extending left and right so that the handrail left-right moving guide center post f32 can translate left and right and guide, the handrail main body portion comprises a handrail bottom plate f4 positioned on the upper side of the handrail base support plate f2 and a handrail surface base plate f44 covered and fixed on the handrail bottom plate f4, and the handrail bottom plate f4 is in contact with the handrail base support plate f2 up and down, the armrest bottom plate f4 horizontally moves along the upper surface of the armrest base support plate f2, so that the armrest main body part can correspondingly move, the armrest surface substrate f44 is the uppermost structure for directly supporting the armrest and is installed and connected to the upper side of the armrest bottom plate f4, the upper surface of the armrest surface substrate f44 can be paved with a leather layer or a spongy cushion and other flexible structure layers to improve comfort, the armrest bottom plate f4 and the armrest base support plate f2 can be integrally formed by plastics, the armrest bottom plate f4 is provided with an armrest front-and-back movement passing hole f41 which penetrates through the armrest left-and-right movement guiding central column f32 up and is adjusted in a front-and-back movement mode, namely, the armrest left-and-right movement guiding central column f32 penetrates through the armrest left-and-right movement passing hole f21 and the armrest front-and-back movement passing hole f41 upwards at the same time, and the front-and back sizes of the armrest left-and-right movement passing hole f21 and the armrest front-and-back movement passing hole f41 are as large as possible in left-and right movement mode as possible The diameters of the guide central columns f32 are equal to or slightly larger, so that the limit in the non-moving direction is ensured, and the handrail left-right moving through hole f21 and the handrail front-back moving through hole f41 are crossed in the projection in the vertical direction, so that the handrail left-right moving guide central column f32 can upwards and simultaneously pass through the two holes. The movement adjustment of the armrest bottom plate f4 represents the movement of the entire armrest body, and may be regarded as movement adjustment of the armrest. Furthermore, the top of the handrail left and right moving guide central post f32 is fixedly connected with a handrail rotating central block f5 for horizontally rotating the handrail bottom plate f4, the upper surface part of the handrail bottom plate f4 is provided with a handrail front and back moving adjusting guide seat f6 which is capable of horizontally rotating the handrail bottom plate f4 around the handrail rotating central block f5 and is capable of adjusting and guiding the handrail bottom plate f4 in the front and back direction, the top of the handrail left and right moving guide central post f32 also passes through the handrail front and back moving adjusting guide seat f6 upwards, from the above structure, it can be seen that the handrail bottom plate f4 can flexibly rotate around the handrail left and right moving guide central post f32, but the rotation is too flexible and too loose, so the handrail rotating central block f5 is provided, so that the rotation of the handrail bottom plate f4 is limited and the front and back movement and force of the handrail bottom plate f4 can be further optimized, the front and rear sides of the armrest rotation center block f5 are configured to provide some rotational stops.

Further, an armrest front-rear movement adjusting limiting groove f42 which extends back and forth and is used for installing and placing the armrest front-rear movement adjusting guide seat f6 is formed on the upper surface of the armrest bottom plate f4, the armrest front-rear movement passing hole f41 is formed in the groove bottom of the armrest front-rear movement adjusting limiting groove f42, the armrest bottom plate f4 is positioned on the left and right side groove walls of the armrest front-rear movement adjusting limiting groove f42 and comprises a front-rear extending straight guide part f421 and a front-rear adjusting arc limiting part f422 which is connected with the straight guide part f421 in a front-rear manner, the front-rear adjusting arc limiting part f422 comprises a plurality of front-rear continuous front-rear adjusting single arc walls f4220 which are arched back to the direction of the armrest front-rear movement adjusting guide seat f6, the front-rear adjusting single arc walls f4220 are single front-rear limiting side walls and form a single arc groove, the left front-rear adjusting single arc wall f4220 forms an arc groove which is arched to the left, the right side is arched rightwards, the front and back movement of the handrail bottom plate f4 can be adjusted by multiple gears and limited by the limiting grooves arranged in front and back, of course, the handrail front and back movement adjusting guide seat f6 also needs to be provided with a structure matched with the handrail front and back movement adjusting limiting grooves f42 on the left side and the right side, specifically: the armrest front-back movement adjusting guide seat f6 is provided with a front-back adjusting spring f611 extending from left to right and a left front-back adjusting end block f612 and a right front-back adjusting end block f613 which are respectively connected with the left end and the right end of the front-back adjusting spring f611 and can respectively abut against the left front-back adjusting single arc-shaped wall f4220 on the left side and the right front-back adjusting end block f4220 on the right side, namely the left front-back adjusting end block f612 and the right front-back adjusting end block f613 can be clamped into arc-shaped grooves formed by the front-back adjusting single arc-shaped walls, so that elastic limiting is achieved, front-back movement adjustment can be achieved only by applying certain force, and therefore front-back adjustment of the armrest bottom plate f4 needs to overcome the elastic limiting structure, and the front-back position of the armrest bottom plate f4 is still in a relatively stable state under the condition that too large external force is not applied after adjustment.

Preferably, the peripheral contour of the armrest front-and-back movement adjusting guide seat f6 is rectangular, the front-and-back adjusting spring f611 extends left and right to penetrate through the armrest front-and-back movement adjusting guide seat f6, a handrail rotation limiting groove f52 is formed on the upper surface of the armrest front-and-back movement adjusting guide seat f6, the handrail rotation limiting groove f5 is recessed to allow the armrest rotation central block f5 to rotate relative to the armrest front-and-back movement adjusting guide seat f6 is located at the bottom of the handrail rotation limiting groove f52, and a handrail rotation central encircling hole f51 is formed in the bottom of the handrail rotation limiting groove f52, the handrail rotation central hole f51 is vertically penetrated through by the top of the armrest left-and-right movement guiding central column f 32. Through the design, the armrest bottom plate f4 can horizontally rotate around the armrest rotating center block f5 fixed on the top of the armrest left-right moving guide center post f32 with the armrest front-back moving adjustment guide seat f6 and can rotate in a limited mode, and the armrest rotating limit groove f52 is arranged. Further, the groove walls of the armrest front-and-rear movement adjusting guide seat f6 on the left and right sides of the armrest rotation limiting groove f52 are both straight walls extending forward and backward, the armrest front-and-rear movement adjusting guide seat f6 on the front side groove wall and the rear side groove wall of the armrest rotation limiting groove f52 form a front side rotation adjusting arc limiting portion f651 and a rear side rotation adjusting arc limiting portion f652, respectively, the front side rotation adjusting arc limiting portion f651 is composed of a plurality of front side rotation adjusting single arc walls f6510 which are continuous in an arc line shape and arched back to the direction of the armrest rotation center encircling hole f51, the front side rotation adjusting single arc walls f6510 form a single forward arched arc limiting groove, the front side rotation adjusting single arc walls f6510 are arranged in the left-and right direction and are preferably on an arc line type forward arched trajectory, the arc trajectory of this arc is preferably the center of the armrest center post left-and right movement guiding arc 32, the handrail front-back movement adjusting guide seat f6 is positioned on the back side groove wall of the handrail rotation limiting groove f52, and the front side groove wall and the back side groove wall are designed to be of a front mirror image structure, and the handrail front-back movement adjusting guide seat specifically comprises the following steps: the rear-side rotation regulation arc restricting portion f652 is composed of a plurality of rear-side rotation regulation single body arc walls f6520 which are continuous in an arc line shape and arched in a direction away from the armrest rotation center surrounding hole f 51.

Further, a front rotation adjusting spring f6511 and a rear rotation adjusting spring f6521 which extend forward and backward and are arranged forward and backward are embedded in the armrest rotation center block f5, the front end of the front rotation adjusting spring f6511 is connected with a front rotation adjusting end block f6512 which can be clamped into the front rotation adjusting single arc-shaped wall f6510, and the rear end of the rear rotation adjusting spring f6521 is connected with a rear rotation adjusting end block f6522 which can be clamped into the rear rotation adjusting single arc-shaped wall f 6520. Through the design of the structure, the front side groove wall and the rear side groove wall of the handrail rotation limiting groove f52 of the rotation adjusting end block can be limited after rotation, the control of the rotation amplitude can be achieved by controlling the left-right distance of the handrail rotation limiting groove f52 and the number of the arc-shaped walls of the rotation adjusting single bodies, and the rotation can be prevented only by the side walls on the left side and the right side of the handrail rotation limiting groove f 52. Moreover, the structure is more stable in the left-right translation.

Preferably, the armrest base support plate f2 has an armrest left-right adjustment limiting groove f22 formed at a lower portion thereof for receiving the armrest left-right adjustment guide plate f31, the armrest base support plate f2 is located at front and rear side walls of the armrest left-right adjustment limiting groove f22 to respectively form a front left-right adjustment arc limiting portion f221 and a rear left-right adjustment limiting portion f222, the front left-right adjustment arc limiting portion f221 is formed by a plurality of front left-right adjustment single arc walls f2210 linearly continuous in left and right directions and arched back to the armrest left-right adjustment guide plate f31, the rear left-right adjustment limiting portion f222 is formed by a plurality of rear left-right adjustment single arc walls f2220 linearly continuous in left and right directions and arched back to the armrest left-right adjustment guide plate f31, and a front left-right adjustment positioning convex portion f311 abutted against the front left-right adjustment arc limiting portion f311 is integrally connected to a front side of the armrest left-right adjustment guide plate f31, the rear side of the left and right handrail moving guide plate f31 is integrally connected with a rear left and right adjusting and positioning arc-shaped protruding part f312 which can abut against the rear left and right adjusting and limiting part f222, elastic limiting of a spring is not adopted, the protruding structure is directly adopted, and certain deformation capacity is directly used as a limiting structure by utilizing plastic property of a plastic material, so that the force application requirement of adjustment is larger, the limiting effect is better, the whole handrail needs larger stability in left and right adjustment, and the structural design of the spring and the end block can be adopted.

Preferably, the armrest ascending/descending keel f1 is provided with an ascending/descending adjustment link lever f7 for ascending/descending adjustment. A lifting adjusting spring f77 which extends downwards and abuts against the lifting adjusting linkage rod f7 to perform lifting adjustment is arranged in the lower side part of the armrest substrate supporting plate f2, a button structure which extends out of the armrest lifting keel f1 can be arranged at the position, below the lifting adjusting spring f77, of the lifting adjusting linkage rod f7, the lifting adjustment of the armrest lifting keel f1 is completed by operating a button and acting on the lifting adjusting spring f77, and therefore the upper position and the lower position of the armrest can also be adjusted.

Like this, whole handrail main part can not only go up and down, can also control the translation to can adjust and control the rotation regulation around with on the basis of controlling the translation, the position of regulation is wider, lets the user have better experience.

The present embodiment also provides a chair, which includes the armrest structure, and other structures of the chair may also adopt the structures of the backrest and the headrest portions of the chair in the previous embodiments.

Embodiment 6, refer to the drawings in embodiment 1, and is an armrest structure, which is an extension design of the armrest structure in embodiment 5, and can be used in combination or separately, and can be better engaged with a chair back and added with various functions.

The method specifically comprises the following steps: the utility model provides an armrest structure, includes main tributary support fossil fragments 1 front side erection joint have preceding support fossil fragments 2 with be used for with seat support fixed connection and supply enable after the installation of main tributary support fossil fragments 1 yaw's end fossil fragments 3, install back of the chair subassembly on the preceding support fossil fragments 2, still include preceding support fossil fragments 2 left side and right side erection joint have an handrail suspension beam d respectively, and mirror symmetry sets up about the handrail suspension beam d of the left and right sides and all install a handrail subassembly in the handrail suspension beam d's of the left and right sides front side position, and mirror symmetry sets up about the handrail subassembly of the left and right sides, and left handrail suspension beam d arches left rear side arc, and right rear side arc arches right side suspension beam d. Through the design of this kind of suspension type for the handrail subassembly just can follow front support fossil fragments 2, perhaps follow the back of the chair and can rock left and right, front and back regulation etc. rather than be the rigid like installing on the seat support, thereby can not cooperate the back of the chair to be suitable for more new functions. The left handrail suspension beam d and the left part of the front support keel 2 are fixedly installed in a bolt fixing installation mode or a clamping mode, and the right handrail suspension beam d and the right part of the front support keel 2 can be fixedly installed in the same fixing mode.

Preferably, the armrest assembly comprises an armrest outer sleeve f, an armrest lifting keel f1 vertically penetrating through the armrest outer sleeve f and capable of being vertically adjusted on the armrest outer sleeve f, an armrest base support plate f2 mounted at the top of the armrest lifting keel f1, and an armrest main body part mounted on the armrest base support plate f2 and used for a hand to lean against, wherein a sleeving clamping block f01 used for being mounted on an armrest suspension beam d is integrally connected to the outer surface of the armrest outer sleeve f, an armrest sleeving pipe d1 vertically penetrating through the armrest outer sleeve f and used for downward sleeving of the armrest suspension beam d is formed at the front side part of the armrest suspension beam d, an armrest sleeving clamping groove d11 clamped with the sleeving clamping block f01 is formed on the inner wall of the armrest sleeving pipe d1, and the armrest outer sleeve f can be clamped on the armrest suspension beam d through the structural design.

Preferably, a lifting adjustment linkage rod f7 for lifting adjustment is installed in the armrest lifting keel f1, the lifting adjustment linkage rod f7 is arranged in a hollow area in the armrest lifting keel f1, the lifting adjustment linkage rod f7 comprises a transverse rod body f71 and a longitudinal rod body f72 which is integrally connected with the rear end of the transverse rod body f71 and extends downwards, a button part f710 is integrally connected to the lower side of the transverse rod body f71, the button part f710 can penetrate downwards out of the armrest lifting keel f1, a lifting adjustment clamping block f720 is integrally connected to the rear side of the longitudinal rod body f72, the lifting adjustment clamping block f720 penetrates backwards out of the armrest lifting keel f1, a row of lifting adjustment ports f00 which are arranged at intervals up and down and penetrate through the lifting adjustment clamping block f720 in front and back are formed in the rear side arm of the armrest f71, the lifting adjustment linkage rod f 56 is fixedly connected with the longitudinal rod body f72, and extends left and right to rotate to adjust the lifting adjustment linkage rod f7 to lift the lifting adjustment The lifting adjusting rotating shaft f73 is used for adjusting the lifting, the lifting adjusting rotating shaft f73 is arranged in the armrest lifting keel f1 in a mounting mode, the button part f710 is located on the front side of the lifting adjusting rotating shaft f73, the button part f710 is pressed upwards on the front side, the lifting adjusting linkage rod f7 deflects around the lifting adjusting rotating shaft f73, the longitudinal rod body f72 moves forwards and downwards to enable the lifting adjusting clamping block f720 to be separated from the lifting adjusting opening f00, so that the armrest lifting keel f1 can freely move up and down in the armrest outer sleeve f, when the armrest lifting adjusting linkage rod f1 moves to a corresponding position, the button part f710 is loosened, the lifting adjusting linkage rod f7 resets, and the lifting adjusting clamping block f720 is clamped into the corresponding lifting adjusting opening f00 to complete positioning.

Then, in order to make the lifting adjustment linkage rod f7 reset well, the following design is made: and a lifting adjusting spring f77 which extends up and down is abutted between the upper side part of the transverse rod body f71 at the button part f710 and the lower surface part of the armrest base supporting plate f 2. Further, an upper spring sleeve f771 for the upper end of the lifting adjusting spring f77 to be sleeved in is formed on the lower surface part of the armrest substrate supporting plate f2, a lower spring sleeve f772 for the lower end of the lifting adjusting spring f77 to be sleeved in is formed on the upper part of the transverse rod body f71, the upper part and the lower part of the transverse rod body f71 are limited to the end part of the spring, and the position of the spring is guaranteed to be stable.

Preferably, the outer side of the handrail elevating keel f1 is further integrally connected with an elevating limiting block f101, the side of the handrail outer sleeve f is provided with an elevating limiting groove f102 which extends up and down and is used for limiting the elevating of the elevating limiting block f101 after being inserted, and the limiting structure is used for ensuring that the handrail elevating keel f1 is limited by the up and down movement on the handrail outer sleeve f and cannot fall out of the handrail outer sleeve f, thereby ensuring the use safety.

Preferably, the chair back component comprises a middle chair back body y1 which is arranged and connected with the front side of the front support keel 2, and a left chair back body y2 and a right chair back body y3 which are arranged and connected with the left side and the right side of the front support keel 2 respectively, the basic structures of the middle chair back body y1, the left chair back body y2 and the right chair back body y3 can be the same, the existing structure can be adopted, only the back of a human body can be relied on, or the spliced structure of the middle headrest in the previous embodiment is adopted, the appearance is different, namely the spliced structure of the sponge cushion, the front side substrate and the rear frame is more practical. And the design of the three chair back bodies can better wrap the waist and abdomen of a human body, and the chair back is more comfortable and safer to use when the swinging function of the chair back is opened.

Furthermore, the middle chair back body y1, the left chair back body y2 and the right chair back body y3 can twist around the front support keel 2, so that a human body can move all the time when leaning on, and the chair back structure with the deformation capability is more comfortable. Then, the design can be made, namely, the middle chair back body y1, the left chair back body y2 and the right chair back body y3 are all connected with the front support keel 2 through the rubber connecting piece x, so after the rubber connecting piece x with better strength is connected through the existing installation and connection mode of screws, as the rigidity of the rubber connecting piece x is not very large, the rubber connecting piece x has good twisting deformation capability, so that certain deformation capability can be provided, the rubber connecting piece x can be in a concave shape or an L shape, and only has certain twisting capability, and the twisting amplitude can be configured according to different crowds, of course, the connection mode of the rubber connecting piece x, the front support keel 2 and the chair back body is preferably detachable, so that the replacement is convenient, and more use requirements of users can be met.

The application also provides a chair, which comprises the armrest structure, and the armrest structure can be compatible with the armrest structure in the embodiment 5, and the structure of other parts of the chair can also adopt the structure design in other embodiments, and the effect of the armrest is more optimal when the armrest is used in the chair with adjustable chair back and headrest.

While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A rocking chair back structure is characterized by comprising a main supporting keel (1), a front supporting keel (2) arranged and connected with the front side of the main supporting keel (1), and a bottom keel (3) which is fixedly connected with a chair seat and used for enabling the main supporting keel (1) to rock left and right after the main supporting keel (1) is arranged, a chair back component is arranged on the front supporting keel (2), a supporting shaft sleeve (31) which is axially connected with the front and back direction and can swing left and right after the main supporting keel (1) is sleeved is integrally connected with the bottom keel (3), the main supporting keel (1) is provided with a swinging sleeving hole (11) which penetrates through the main supporting keel in the front-back direction and is sleeved on the supporting shaft sleeve (31), the bottom keel (3) and a switch device for switching the switching state of the main support keel (1) in a left-right swinging mode is arranged between the main support keel (1).

2. The rocking chair back structure as claimed in claim 1, wherein the switch means comprises a vertically open unlocking hole (101) provided at a lower portion of the main support keel (1) and a locking latch (301) mounted on the bottom keel (3) and capable of being lifted up and down to complete the closing and opening of the side-to-side rocking function of the main support keel (1) by entering and exiting the unlocking hole (101).

3. A swingable backrest structure according to claim 2, wherein the base keel (3) is provided with a pull wire (302) which is pulled to lower the locking latch (301) out of the unlocking hole (101) and a resilient return means which is capable of returning the locking latch (301) into the unlocking hole (101) when the pull wire (302) is retracted.

4. A swingable backrest structure according to claim 3, wherein said elastic return means comprises a spring (303) for switching the swing function switch fitted over the locking pin (301).

5. The structure of claim 4, wherein a pin base (4) for mounting the locking pin (301) is fixed in the bottom keel (3), the pin base (4) comprises a top base plate (41) and a left base plate (42) and a right base plate (43) which are fixed on the left and right sides of the top base plate (41) and extend downwards, respectively, the locking pin (301) has a top inserting portion (3011) which is inserted upwards into the unlocking hole (101), a limiting sleeve (3012) for limiting the upper part of the spring (303) for switching the swinging function switch is sleeved on the periphery of the part of the locking pin (301) below the top inserting portion (3011), the lower part of the spring (303) for switching the swinging function switch is abutted on the upper surface of the top base plate (41), the swing function switch switching spring (303) is located between the limit sleeve (3012) and the top substrate (41).

6. A swingable chair back structure according to claim 5, wherein said elastic return means further comprises a shift fork (44) located between said left base plate (42) and said right base plate (43) and below said top base plate (41) for moving a lock bolt (301) downward, one end of said pull wire (302) being connected to said shift fork (44) as a connecting end (3021), and the other end of said pull wire (302) being an operating end (3022).

7. The structure of claim 6, wherein the locking bolt (301) has a lower insertion portion (3013) passing downward through the top base plate (41) and located below the top base plate (41), the lower insertion portion (3013) is provided with a shifted shaft rod (30133) extending left and right, the left end of the shifted shaft rod (30133) is inserted into the left base plate (42) and can move up and down, the right end of the shifted shaft rod (30133) is inserted into the right base plate (43) and can move up and down, the left base plate (42) is provided with a left lifting guide slot (421) extending up and down for the left end of the shifted shaft rod (30133) to be inserted and move up and down, the right base plate (43) is provided with a right lifting guide slot (431) extending up and down for the right end of the shifted shaft rod (30133) to be inserted and move up and down, the shifting fork (44) comprises an upper shifting plate (441) which is positioned above the shifted shaft rod (30133) and can be abutted with the shifted shaft rod (30133) up and down, a left shifting claw (4411) and a right shifting claw (4412) which are arranged at left and right intervals are formed on the rear part of the upper shifting plate (441), the left shifting claw (4411) is positioned between a lower inserting part (3013) and a left side base plate (42) and positioned above the part of the shifted shaft rod (30133) between the lower inserting part (3013) and the left side base plate (42), the left shifting claw (4411) can be abutted with the part of the shifted shaft rod (30133) between the lower inserting part (3013) and the left side base plate (42) up and down, the right shifting claw (4412) is positioned between the lower inserting part (3013) and the right side base plate (43) and positioned above the part of the shifted shaft rod (30133) between the lower inserting part (3013) and the right side base plate (43), and the right poking claw (4412) can be abutted up and down with the part of the poked shaft rod (30133) between the lower insertion part (3013) and the right side substrate (43), the upper poking plate (441) is also integrally connected with a lower poking plate (442) positioned below the upper poking plate (441), and the lower poking plate (442) is connected with the connecting end (3021) of the pull wire (302) by the lower end part.

8. The structure of a swingable seatback as claimed in claim 7, wherein an upper end of said lower dial plate (442) is integrally connected to a front end of said upper dial plate (441) and a fork driving shaft (443) extending left and right for rotating said fork (44) is inserted at the integral connection, said lower dial plate (442) is inclined rearward and downward when the side-to-side swinging function of said main support keel (1) is in a closed state, and said stay (302) is located forward of said lower dial plate (442).

9. The structure of the rocking chair back according to claim 1, wherein a rocking return spring (1000) extending left and right for buffering and returning the left and right rocking of the main support keel (1) is inserted into the main support keel (1), and a left and right rocking blocking stopper rod (1001) is fixed to the bottom keel (3) and penetrates the main support keel (1) forward and is inserted into a position between the left and right ends of the rocking return spring (1000) by the front end portion.

10. A chair, characterized in that it comprises a swingable backrest structure as claimed in any one of claims 1 to 9, and further comprises a seat (z) fixed to said bottom frame (3) in front of said bottom frame (3), said seat (z) being provided with a side-to-side function adjusting knob (z 1) connected to an operating end (3022) of said pull wire (302) for pulling and retracting said pull wire (302).