Seat-back linkage device

Abstract

Disclosed in the present invention is a seat-back linkage device, comprising a base, a bracket plate and a back connecting member, wherein the connecting member comprises cranks and a connecting plate which are connected into a whole, and further comprising a swing support arranged between the base and the bracket plate. Two ends of each crank are hinged to the bracket plate and the swing support, respectively; long grove guide mechanisms are arranged between the bracket plate and the swing support; and the swing support is hinged to the base in the middle position, such that the swing support, the connecting member and the bracket plate can jointly obliquely swing left and right relative to the base. On the basis that an original supporting plate seat can raise / lower relative to the base, the swing support hinged to the base is arranged between the base and the supporting plate seat, such that the swing support can obliquely swing left and right relative to the base. When a user leans on or leaves a backrest of a seat, the seat can adapt to the weight of the user to raise or lower, and on this basis, the seat can also obliquely swing left and right so as to relieve the discomfort of the user due to long-time sitting.

Description

Seat-back linkage Technical Field

[0001] The present invention relates to the technical field of seats, and in particular to a seat back linkage device for a seat. Background Art

[0002] As modern people pursue health, more and more users choose ergonomic chairs to relieve the discomfort of sitting for long periods of time. Similarly, manufacturers have spent time designing ergonomic chairs in terms of backrests, lumbar support, and seats to ensure users' comfort and relieve the discomfort of sitting for long periods of time.

[0003] The invention patent with application publication number CN109419196A discloses a synchronous linkage device for the backrest of an office chair, which includes a base, a bracket for connecting the seat, a rocker for connecting the chair back, and a crank integrated with the rocker, wherein the two ends of the crank are hinged to the front of the bracket and the base respectively; a slide guide mechanism for guiding the rear of the bracket to rise and fall is provided between the rear of the bracket and the base; when the rocker rotates and tilts, the front and rear of the bracket rise or fall at the same time, that is, the user leans back against the backrest to rotate and tilt the rocker, while driving the seat to rise within a certain range. This linkage method adapts to the user's weight and drives the seat to move when the chair back is reclined, but it cannot adapt to the user's left or right leaning sitting posture. If the user sits in the same posture for a long time, it will put great pressure on the spine, and discomfort symptoms will occur over time. Technical issues

[0004] The purpose of the present invention is to overcome the deficiencies existing in the above-mentioned prior art and to provide a seat back linkage device. On the basis of the original tray seat being able to rise and fall relative to the base, a swing bracket hinged to the base is set between the base and the tray seat, so that the tray seat and the swing bracket can be tilted and swung left and right relative to the base. After the user sits down, the seat can adapt to the user's weight when the user leans on or leaves the backrest or the seat user's body tilts left and right and swings, thereby improving the discomfort and even symptoms caused by sitting for a long time. Technical Solutions

[0005] The technical solution of the present invention is achieved as follows:

[0006] A seat-back linkage device comprises a base, a pallet seat for supporting a chair seat, and a connecting piece for connecting the chair back, the connecting piece comprising a crank and a connecting plate arranged along the front-to-back direction of the base and connected as one body, the chassis also comprising a swing bracket, the swing bracket being arranged between the base and the pallet seat, the two ends of the crank being hinged to the pallet seat and the swing bracket respectively, a slide guide mechanism for guiding the pallet seat to rise and fall is provided between the pallet seat and the swing bracket; and the swing bracket is hinged to the base at a middle position, so that the swing bracket, the connecting piece and the pallet seat can tilt and swing left and right relative to the base together. Beneficial effects

[0007] The design starting point, concept and beneficial effects of the present invention using the above technical solution are:

[0008] The technical solution of the present invention is to set a swing bracket hinged to the base between the base and the pallet seat on the basis that the original pallet seat can be lifted and lowered relative to the base, so that the swing bracket can tilt and swing left and right relative to the base.

[0009] Specifically, the two ends of the crank of the connecting member are hinged to the tray seat and the swing bracket respectively. The tray seat can be guided by a slide guide mechanism set between the tray seat and the swing bracket for lifting and lowering. As the user leans on or leaves the backrest, the tray seat can rise or fall adaptively with the user's weight. On this basis, a swing bracket is set between the base and the tray seat. The swing bracket and the base are hinged at a middle position. The tray seat and the swing bracket can tilt and swing left and right relative to the base. The tray seat can also tilt and swing left and right as the user leans left or right, allowing the user to change the sitting posture to relieve the discomfort of sitting for a long time.

[0010] When the user leans on or leaves the chair back, the seat can rise or fall adaptively with the user's weight. On this basis, the seat can also tilt and swing left and right. The seat can adaptively rise and fall or swing left and right according to the user's actions of leaning on the backrest and leaning left and right to change the sitting posture, so as to relieve the user's discomfort from sitting for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] FIG1 is a schematic perspective view of an overall structure of an adaptive chassis for a chair seat according to the present invention;

[0012] FIG2 is an exploded schematic diagram of the adaptive chassis of the present invention;

[0013] FIG3 is a side view of the support plate seat of the adaptive chassis of the present invention in a horizontal position;

[0014] FIG4 is a front view of the swing bracket of the adaptive chassis of the present invention in a horizontal position;

[0015] FIG5 is a front view of the swing bracket of the adaptive chassis of the present invention in a left-leaning position;

[0016] FIG6 is a front view of the swing bracket of the adaptive chassis of the present invention in a right-leaning position;

[0017] FIG7 is a perspective view of the connection between the swing bracket, base, and elastic mechanism of the adaptive chassis of the present invention;

[0018] FIG8 is a partial cross-sectional view of the connection between the swing bracket, base, and elastic mechanism of the adaptive chassis of the present invention;

[0019] FIG9 is an exploded schematic diagram of the connection between the swing bracket, base, and elastic mechanism of the adaptive chassis of the present invention;

[0020] FIG10 is a side view of the tray seat of the adaptive chassis of the present invention rising;

[0021] FIG11 is a side perspective view of the self-adaptive chassis of the present invention with the support plate seat raised;

[0022] FIG12 is another side perspective view of the self-adaptive chassis of the present invention with the support plate seat rising;

[0023] FIG13 is a perspective view of the swing locking mechanism of the adaptive chassis of the present invention and the connection between the swing bracket, the base and the elastic mechanism;

[0024] FIG14 is a partial cross-sectional view of the swing bracket of the adaptive chassis of the present invention in an unlocked state;

[0025] FIG15 is a partial cross-sectional view of the swing bracket of the adaptive chassis of the present invention in a locked state;

[0026] FIG16 is a perspective schematic diagram of the lifting and locking mechanism of the adaptive chassis of the present invention;

[0027] FIG17 is a perspective view of the other side of the lifting and locking mechanism of the adaptive chassis of the present invention;

[0028] FIG18 is a diagram of the adaptive chassis left-right swing elastic mechanism of the present invention.

[0029] The reference numerals are: 1 base; 101 front part 2; 1011 side ear; 10111 side ear body; 10112 ear plate; 10113 locking hole; 10114 support ear; 10115 lug; 102 rear part 2; 1021 side plate; 10211 waist-shaped hole; 103 accommodating cavity; 2 support plate seat; 201 support plate; 202 vertical plate; 3 swing bracket; 301 front part 1; 3011 side wing; 30111 Side wing body; 30112 wing plate; 3012 movable hole; 302 rear part one; 304 first pin; 306 baffle; 307 front panel; 308 third pin; 309 rear panel; 4 elastic mechanism; 401 swing pressure spring; 402 bolt; 403 nut; 404 elastic rubber; 5 connecting piece; 501 crank; 502 connecting plate; 6 locking plate; 601 pin hole; 602 boss; 603 fixing pin; 6 031 limit head; 7 lifting and locking mechanism; 701 side plate; 7011 guide hole; 702 latch control mechanism; 7021 wire control bracket; 7022 wire control 1; 70221 outer tube; 70222 pull rope; 70223 pull rope head; 7023 waist-shaped compression spring; 7024 torsion spring 1; 70241 elastic arm 1; 702411 ring; 70242 elastic arm 2; 7025 set screw; 705 plug Pin; 8 slide guide mechanism; 801 limit slide; 802 second pin shaft; 9 swing locking mechanism; 901 locking pin; 902 locking pin control mechanism; 9021 locking bracket; 9022 wire control 2; 90221 outer sleeve; 90222 pull wire; 90223 pull wire head; 903 compression spring; 904 torsion spring 2; 9041 elastic arm 1; 90411 collar; 9042 elastic arm 2; 905 fastening screw. Modes for Carrying Out the Invention

[0030] The present invention is further described below with reference to a specific embodiment. The invention patent with application publication number CN109419196A discloses a synchronous linkage device for the backrest of an office chair. This linkage method adapts to the user's weight and drives the seat to move when the chair back is reclined, but cannot adapt to the user's left or right leaning sitting posture.

[0031] Based on the above reasons, the seat back linkage device of this embodiment is shown in Figure 1-18:

[0032] As shown in Figures 1 and 2, an adaptive chassis for a chair seat includes a base 1, a tray seat 2 for supporting the chair seat, and a connector 5 for connecting the chair back. The connector 5 includes a crank 501 and a connecting plate 502 arranged in the front-to-back direction of the base 1 and connected as one body. In addition, the adaptive chassis also includes a swing bracket 3, which is arranged between the base 1 and the tray seat 2.

[0033] Specifically, as shown in Figures 3 and 10, the two ends of the crank of the connecting member are hinged to the pallet seat and the swing bracket respectively, the crank 501 is in an inclined state, the upper end of the crank 501 is hinged to the pallet seat 2 through the third pin 308; the lower end of the crank 501 is hinged to the swing bracket 3 through the first pin 304; a slide guide mechanism 8 is provided between the pallet seat 2 and the swing bracket 3 to guide the pallet seat 2 to rise and fall, the pallet seat can be guided by the slide guide mechanism between the pallet seat and the swing bracket, and the swing bracket is hinged to the base 1 in the middle position, so that the swing bracket, the connecting member and the pallet seat can tilt and swing left and right relative to the base 1 together, the pallet seat 2 includes a pallet 201 and a vertical plate 202 hanging down on the left and right sides of the pallet 201, the slide guide mechanism 8 includes a limiting slide 801 and a second pin 802, the limiting The positioning slide 801 is opened on one of the vertical plate 202 or the swing bracket 3, and the second pin 802 is connected to the other of the vertical plate 202 or the swing bracket 3, and the second pin 802 is inserted in the limiting slide 801, and the connecting plate 502 is connected to the seat back. When the connecting plate 502 drives the crank 501 to rotate synchronously, the support plate seat 2 rises and falls, and the second pin 802 and the limiting slide 801 slide relative to each other, that is, as the user leans on or leaves the chair back, the chair seat can adapt to the user's weight when the user leans on or leaves the chair back; when the connecting plate drives the crank to rotate relative to the swing bracket, the crank drives the support plate seat to rise and fall. Since the second pin is connected to the vertical plate or the swing bracket, and the second pin can only slide relative to each other in the limiting slide, the lifting and lowering of the support plate seat is smooth and stable; Figure 3 shows the support plate seat 2 in a horizontal state, and Figure 10 shows the support plate seat 2 in a raised state. This embodiment only describes the action of the support seat 2 being able to adapt to the user's weight and rise and fall as the user leans on or leaves the chair back. For other specific details, please refer to the detailed description of the inventor in the invention patent application publication number CN109419196A.

[0034] Further explanation is given, on the basis that the tray seat 2 can adapt to the user's weight and can be raised and lowered as the user leans on or leaves the chair back, a swing bracket 3 is provided between the base 1 and the tray seat 2. The swing bracket is hinged to the base 1 at the middle position, and the tray seat and the swing bracket can tilt and swing left and right relative to the base 1. The tray seat can also tilt and swing left and right as the user leans left or right, and the user can change his sitting posture to relieve the discomfort of sitting for a long time; the swing bracket 3 is a frame structure, and along the front and rear directions of the chassis, the swing bracket 3 includes a front part 1 301 and a rear part 302 connected as one body, and the swing bracket 3 includes a front part 2 101 and a rear part 102 connected as one body for the base 1; the front part 1 301 and the front part 2 101 are rotatably connected on the left-right symmetrical center line of the base, and the rear part 1 302 and the rear part 2 102 are rotatably connected on the left-right symmetrical center line of the base, so as shown in Figures 5 and 6, the swing bracket 3 as a whole can tilt and swing left and right relative to the base. In addition, the above-mentioned chute guide mechanism 8 can be arranged between the rear portion 302 and the pallet seat 2 as shown in Figure 3, or it can be arranged between the front portion 301 and the pallet seat 2. The front and rear parts of the swing bracket are rotatably connected to the front and rear parts of the base 1 respectively, so that the swing bracket can be tilted and swung left and right relative to the base 1; the position of the chute guide structure can be set according to the needs of the chassis structure and the direction of the crank tilt. The chassis also includes a swing locking mechanism for limiting the swing bracket to a horizontal state. The setting of the swing locking mechanism allows the user to activate the swing locking mechanism when the user does not need the seat to swing left and right, and the seat can be fixed in a horizontal position.

[0035] Further explanation, as shown in Figures 8 and 9, on the swing bracket 3, side wings 3011 are symmetrically extended from the left and right sides of the front part 1 301; on the base 1, side ears 1011 are symmetrically extended from the left and right sides of the front part 2 101; the side wings 3011 and the side ears 1011 are arranged opposite to each other in the vertical direction, and a deep accommodating cavity 103 is formed in each of the side wings 3011 and the side ears 1011, and the side of the side wings 3011 opposite to the side ears 1011 is open to communicate in space, and the accommodating cavity The space formed below can accommodate the elastic mechanism, so that the elastic mechanism can operate stably. Elastic mechanisms 4 for providing a restoring force to the swing bracket 3 after it swings are symmetrically provided on the left and right sides of the chassis. The elastic mechanism 4 is between the side wing 3011 and the side ear 1011 on the same side, and the upper and lower parts are in the upper and lower accommodating cavities 103; on the one hand, the structure is simple and compact; on the other hand, when the swing bracket tilts to the left or right relative to the base 1, the elastic mechanism cushions the swinging action of the swing bracket, thereby increasing the user's comfort when using it.

[0036] To further illustrate, as shown in FIG9 , to achieve a compact chassis structure, the swing bracket 3 is configured as a frame-type structure. The swing bracket 3 includes a bilaterally symmetrical baffle 306 and a front panel 307 and a rear panel 309 connected to the front and rear sides of the baffle 306. The base 1 is located within the space enclosed by the baffle 306, the front panel 307, and the rear panel 309. The location of the base 1 within the space enclosed by the baffle, the front panel, and the rear panel makes the entire chassis structure compact.

[0037] To further illustrate, as shown in Figures 8 and 9, the elastic mechanism 4 includes an elastic member capable of generating a restoring force, such as a swinging compression spring 401. When the side wings 3011 swing with the swing bracket 3, the swinging compression spring 401 is compressed to generate a restoring force. The swinging compression spring of the elastic mechanism is an elastic member that compresses when the swing bracket tilts to generate a restoring force. When the user leaves or tilts to the other side, the restoring force acts to restore the seat to a horizontal position or to help the seat tilt to the other side. Alternatively, the elastic member may be a tension spring. When the side wings 3011 swing with the swing bracket 3, the tension spring is stretched to generate a restoring force. The elastic member of the elastic mechanism 4 can generate a restoring force to help the seat return to its original position or tilt, and can also provide a buffering force for the seat's tilt, thereby improving the user's comfort when leaning left or right.

[0038] To further illustrate, as shown in Figures 8 and 9, when the elastic part of the elastic mechanism 4 is a swinging compression spring 401, the elastic mechanism 4 also includes a bolt 402 and a nut 403. The bolt 402 passes through the side wing 3011 and the side ear 1011, and the part of the bolt 402 that passes through is threadedly connected to the nut 403. The swinging compression spring 401 is sleeved on the section of the bolt 402 between the side wing 3011 and the side ear 1011. In this way, the swinging range of the swing bracket 3 is limited between the nut 403 and the side wing 3011. The swinging compression spring is sleeved on the bolt, and the part of the bolt that passes through the side wing is threadedly connected to the nut. The swinging range of the swing bracket is limited between the nut and the side wing. The limitation of the swinging range of the swing bracket prevents the swing bracket 3 from hitting the base 1 enclosed in the swing bracket 3 when it tilts left and right, causing abnormal noise or even damage.

[0039] To further illustrate, as shown in FIG18 , the elastic member in the elastic mechanism 4 can also be an elastic rubber 404. Mounting posts 4041 are provided at both ends of the elastic rubber 404. The two mounting posts 4041 are fixedly inserted into the holes pre-set in the side wings 3011 and the side ears 1011, respectively. Directly inserting the mounting posts into the holes pre-set in the side wings and side ears results in a simple structure and convenient installation. The elastic rubber has both elasticity and compression and stretching properties. On the one hand, it provides a cushioning force for the swinging action, enhancing the user's swinging comfort. On the other hand, it also generates a restoring force to help the swing bracket reset and keep the swing range of the swing seat within the rubber's stretching range. When the side wings 3011 swing with the swing bracket 3, one side wing 3011 compresses the elastic rubber 404 to generate a restoring force, while the other side wing 3011 stretches the elastic rubber 404, causing the swing bracket 3 to swing within the elastic rubber's stretching range.

[0040] To further explain, as shown in Figures 8 and 9, the base 1 includes a bottom plate, side plates 1021 extending upward from the left and right sides of the bottom plate, and vertical plates 1022 extending upward from the front and rear sides of the bottom plate; a waist-shaped hole 10211 is opened in the side plate 1021, and the crank 501 is hinged to the swing bracket 3 through the first pin shaft 304. The first pin shaft 304 is also passed through the waist-shaped hole 10211. When the swing bracket 3 swings left and right, the first pin shaft 304 moves up and down in the waist-shaped hole 10211. The waist-shaped hole is opened on the side plate, and the first pin shaft has movement space in the waist-shaped hole. The left and right swing of the rear part of the swing bracket 3 is smooth and the range is further limited to avoid the swing bracket 3 hitting the base 1 when swinging and generating abnormal noise.

[0041] However, when the user does not need to tilt and swing the swing bracket 3 left and right, and needs to keep the swing bracket 3 in a horizontal state, the adaptive chassis is provided with a swing locking mechanism 9.

[0042] Further explanation, as shown in Figure 13, the swing locking mechanism 9 includes a locking pin 901 and a locking pin control mechanism 902; the locking pin 901 is inserted into the guide hole 30113; to be more specific, the side wing 3011 includes a horizontally arranged side wing body 30111 and a wing plate 30112 vertically bent from the edge of the side wing body 30111, and the side ear 1011 includes a side ear body 10111 and an ear plate 10112 vertically bent from the edge of the side ear body 10111; the wing plate and the ear plate are staggered up and down in some positions, and the staggered parts are provided with guide holes 30113 and locking holes 10113 corresponding to the horizontal positions.

[0043] The lugs 10112 include lugs 10114 perpendicular to the left and right sidewalls of the base. Lugs 10114 extend upward to form lugs 10115. Lugs 10115 are vertically staggered with adjacent wing plates 30112, and are located outside the adjacent wing plates 30112. Locking holes 10113 are provided on lugs 10115, and guide holes 30113 are provided on wing plates 30112. The staggered arrangement of the lugs and wing plates prevents interference when the swing bracket swings left or right. The proximity of the lugs to the wing plates minimizes the travel distance of the locking pin when the swing bracket switches between locked and unlocked positions, reducing switching errors.

[0044] The locking pin is inserted into the guide hole and is controlled to move. When the locking pin is inserted into both the guide hole and the locking hole, the swing bracket is locked. When the locking pin leaves the locking hole and only inserts into the guide hole, the swing bracket is unlocked. The position of the base is fixed. When the swing bracket needs to be locked, the locking pin is inserted into the guide hole of the swing bracket wing plate and the locking hole of the base ear plate at the same time, and the position of the swing bracket is fixed relative to the base. When the swing bracket needs to swing, the locking pin leaves the locking hole and only inserts into the guide hole, and the swing bracket can swing left and right relative to the base. The swing locking and unlocking of the seat are achieved by the simple cooperation of the pin and the hole. The structure is simple and the cost is low. The pins and holes are arranged on the side wings and side ears on the left and right sides of the swing bracket and the base, which increase the locking force arm for locking the swing bracket and enhance the swing locking effect.

[0045] The locking pin control mechanism 902 includes a locking bracket 9021 fixed on the front wall of the swing bracket 3, and a wire control 2 9022. The wire control 2 9022 includes an outer sleeve 90221 and a pull wire 90222 that moves telescopically in the outer sleeve 90221. The outer sleeve 90221 is installed on the locking bracket 9021. The part of the pull wire 90222 exposed from the outer sleeve 90221 is connected to a pull wire head 90223. A compression spring 903 is also provided between the pull wire head 90223 and the locking bracket 9021. The compression spring 903 is arranged along the direction in which the pull wire 90222 extends. The left side of the pull wire head 90223 Torsion springs 904 are symmetrically provided on both sides of the right side. The loop in the middle of torsion spring 904 is put on a fastening screw 905 connected to the upper part of the swing bracket 3, so that torsion spring 904 as a whole rotates around the fastening screw 905. Torsion spring 904 has elastic arm 1 9041 and elastic arm 2 9042 respectively arranged on both sides of the fastening screw 905. The end of elastic arm 1 9041 is rolled into a ring 90411, and the ring 90411 passes through the pull wire 90222 and abuts against the pull wire head 90223. The elastic arm 2 9042 is bent and passes through the movable hole 3012 reserved on the wing plate 30112 to connect with the locking pin 901.

[0046] To further illustrate, when the pull wire 90222 moves in the shortening direction, the pull wire head 90223 drives the elastic arm 1 9041 to rotate while the compression spring 903 is compressed to generate a reset elastic force, as shown in Figure 15, when the locking pin 901 moves synchronously and is inserted into the guide hole 30113 and the locking hole 10113 at the same time, the swing bracket 3 is in a locked state; when the pull wire 90222 is released, that is, moves in the lengthening direction, the compression spring 903 releases the elastic force to help the pull wire head 90223 and the torsion spring 2 904 and the locking pin 901 to reset, and the torsion spring 2 at both ends of the swing bracket is rotated at the same time through the wire-controlled pull wire shortening or lengthening method, and drives the locking pin to move, thereby realizing the locking and unlocking of the swing bracket. This method has a simple structure, is easy to operate, and is convenient to arrange. As shown in Figure 14, when the locking pin 901 leaves the locking hole 10113 and is only inserted into the guide hole 30113, the swing bracket 3 is unlocked.

[0047] Furthermore, unlike the locking mechanism used in the invention patent application with publication number CN109419196A to maintain the tray seat 2 in a raised or lowered horizontal position, the adaptive chassis for the seat of the present invention further includes a lifting and locking mechanism 7 for maintaining the tray seat in a raised or lowered horizontal position. The provision of the lifting and locking mechanism allows the seat to be maintained in a desired position by activating the lifting and locking mechanism when the user does not need the seat to be raised or lowered.

[0048] Specifically, as shown in Figure 16, the lifting locking mechanism 7 includes a locking plate 6, which is located between the third pin shaft 308 and the second pin shaft 802. The locking plate 6 is movably connected to the second pin shaft 802, and the locking plate 6 is fixedly connected to the third pin shaft 308. The front end of the locking plate 6 exceeds the third pin shaft 308 and is provided with multiple pin holes 601; the lifting locking mechanism 7 also includes opposing side plates 701, which are fixed on the front wall of the swing bracket 3, and the side plates 701 are parallel to the locking plate 6. Guide holes 7011 are provided on the side plates 701. When the latch is inserted into the guide hole and the pin hole at the same time, since the side plate is fixed to the front wall of the swing bracket, the position of the locking plate is fixed and the position of the third pin shaft fixedly connected thereto is also fixed, so the lifting and lowering of the pallet seat is locked; when the latch leaves the pin hole and is only inserted into the guide hole, the locking plate is unlocked and the position of the third pin shaft fixedly connected to the locking plate is also unlocked, so the lifting and lowering of the pallet seat is unlocked; by setting up a locking plate between the third pin shaft and the second pin shaft, the pin hole on the locking plate is combined with the latch to achieve the purpose of locking and unlocking the pallet seat, which reasonably utilizes the chassis structure space and makes the chassis structure compact.

[0049] Further explanation, as shown in Figure 16, the lifting and locking mechanism 7 also includes a latch 705 and a latch control mechanism 702. The latch 705 is inserted into the guide hole 7011, and the latch is controlled to move. The latch control mechanism 702 includes a wire control bracket 7021 fixed to the periphery of the side stand 701, and a wire control 1 7022. The wire control 1 7022 includes an outer tube 70221 and a pull rope 70222 that moves telescopically in the outer tube 70221. The outer tube 70221 is installed on the wire control bracket 7021. The part of the pull rope 70222 exposed in the outer tube is connected to a pull rope head 70223. A waist-shaped compression spring 7 is also provided between the pull rope head 70223 and the wire control bracket 7021. 023. The waist-shaped compression spring 7023 is arranged along the extension direction of the pull rope 7022. A torsion spring 1 7024 is provided on the right side of the pull rope head. The loop in the middle of the torsion spring 1 7024 is put on the tightening screw 7025 on the upper part of the wire control bracket 7021, so that the torsion spring 1 7024 rotates around the tightening screw 7025 as a whole. The torsion spring 1 7024 has an elastic arm 1 70241 and an elastic arm 2 70242 respectively arranged on both sides of the tightening screw 7025. The end of the elastic arm 1 70241 is rolled into a loop 702411, which passes through the pull rope 70222 and abuts against the pull rope head 70223, and the elastic arm 2 70242 is bent and inserted on the right side of the pin 705.

[0050] To further explain, when the pull rope 70222 moves in the shortening direction, the elastic arm 70241 is driven to rotate by the pull rope head 70223, and the waist-shaped compression spring 7023 is compressed to generate a reset elastic force. When the pin 705 moves synchronously and is inserted into the guide hole 7011 and the pin hole 601 at the same time, the locking plate 6 is in a locked state; when the pull rope 70222 is released, that is, moves in the lengthening direction, the waist-shaped compression spring 7023 releases the elastic force to help the pull rope head 70223, the torsion spring 7024, and the pin 705 to reset. When the pin 705 leaves the pin hole 601 and is only inserted into the guide hole 7011, the locking plate 6 is unlocked.

[0051] To further explain, the swing locking mechanism 9 and the lifting locking mechanism 7 both use wire control to control the length of the pull wire in the wire control to twist the torsion spring, and at the same time drive the pin to move and insert or leave the locking hole to achieve the purpose of locking or unlocking. This locking method has a simple and compact structure. Since the wire control is soft, the wire control can be flexibly arranged and can be arranged front to back or left to right; the terminal of the wire control is provided with a switch to keep the wire control shortened or extended; the switches of the swing locking mechanism 9, the lifting locking mechanism 7 and even the seat gas spring can be concentrated in a certain place on the seat.

[0052] To further explain, in order to further limit the lifting range of the seat, as shown in Figure 12, the locking plate 6 has upper and lower limit bosses 602 on its front end, facing outward. A fixing pin 603 is fixed to the upper end of the side plate 701. The fixing pin 603 protrudes from the side plate 701 toward one end of the locking plate 6 to form a limit head 6031. When the support plate seat 2 is raised or restored to a horizontal position, the fixing pin 603 is always located between the two bosses 602. This allows the support plate seat to be raised or lowered within the distance between the two bosses, allowing the seat to be raised or lowered within the range.

Claims

1. A seat-back linkage device, comprising a base (1), a support plate (2) for supporting a seat, and a connector (5) for connecting the seat-back, the connector (5) comprising a crank (501) and a connecting plate (502) arranged in a front-to-rear direction of the base (1) and connected as one body, characterized in that: The invention also includes a swing bracket (3), wherein the swing bracket (3) is arranged between the base (1) and the support plate seat (2), and the two ends of the crank (501) are respectively hinged to the support plate seat (2) and the swing bracket (3), and a slide guide mechanism (8) for guiding the support plate seat (2) to rise and fall is provided between the support plate seat (2) and the swing bracket (3); and the swing bracket (3) is hinged to the base (1) at a middle position, so that the swing bracket (3), the connecting member (5) and the support plate seat (2) can tilt and swing left and right relative to the base (1).

2. The seat back linkage device according to claim 1, characterized in that: Along the front-to-back direction of the chassis, the swing bracket (3) is a frame structure, the swing bracket (3) includes a front part one (301) and a rear part one (302) connected as one body, and the base (1) includes a front part two (101) and a rear part two (102) connected as one body; the front part one (301) and the front part two (101) are rotatably connected on a left-right symmetrical center line of the base, and the rear part one (302) and the rear part two (102) are rotatably connected on a left-right symmetrical center line of the base; the slide guide mechanism (8) is arranged between the front part one (301) and the support plate seat (2), or the slide guide mechanism (8) is arranged between the rear part one (302) and the support plate seat (2).

3. The seat back linkage device according to claim 2, characterized in that: On the swing bracket (3), side wings (3011) are symmetrically extended from the left and right sides of the front part (301); on the base (1), side ears (1011) are symmetrically extended from the left and right sides of the front part (101); and elastic mechanisms (4) for providing a restoring force to the swing bracket (3) when it swings are symmetrically provided on the left and right sides of the chassis, and the elastic mechanisms (4) are between the side wings (3011) and the side ears (1011) on the same side.

4. The seat back linkage device according to claim 3, characterized in that: The side wings (3011) and the side ears (1011) are arranged opposite to each other in the upper and lower directions. The elastic mechanism (4) includes a swinging compression spring (401). When the side wings (3011) swing along with the swinging bracket (3), the swinging compression spring (401) is compressed to generate a restoring elastic force.

5. The seat back linkage device according to claim 4, characterized in that: The elastic mechanism (4) further comprises a bolt (402) and a nut (403), wherein the bolt (402) penetrates the side wing (3011) and the side ear (1011), and the portion of the bolt (402) passing through is threadedly connected to the nut (403), and the swing compression spring (401) is sleeved on the section of the bolt (402) between the side wing (3011) and the side ear (1011), and the swing range of the swing bracket (3) is limited to between the nut (403) and the side wing (3011).

6. The seat back linkage device according to claim 3, characterized in that: In the longitudinal direction, the side wings (3011) and the side ears (1011) each form a deep accommodating cavity (103), and the side of the side wings (3011) opposite to the side ears (1011) is open to communicate in space, and the upper and lower parts of the elastic mechanism (4) are located in the upper and lower accommodating cavities (103).

7. The seat back linkage device according to claim 3, characterized in that: The side ears (1011) and the side wings (3011) are arranged opposite to each other in the upper and lower directions. The elastic mechanism (4) includes a tension spring. When the side wings (3011) swing along with the swing bracket (3), the tension spring is stretched to generate a restoring elastic force.

8. The seat back linkage device according to claim 1, characterized in that: The base (1) comprises a bottom plate, side plates (1021) extending upward from the left and right sides of the bottom plate, and vertical plates (1022) extending upward from the front and rear sides of the bottom plate; a waist-shaped hole (10211) is opened in the side plates (1021), the crank (501) is hinged to the swing bracket (3) through a first pin (304), and the first pin (304) is simultaneously inserted into the waist-shaped hole (10211). When the swing bracket (3) swings left and right, the first pin (304) moves up and down in the waist-shaped hole (10211).

9. The seat back linkage device according to claim 1 or 8, characterized in that: The swing bracket (3) is a frame-type structure. The swing bracket (3) includes a left-right symmetrical baffle (306) and a front panel (307) and a rear panel (309) connected to the front and rear sides of the baffle (306). The base (1) is located in a space surrounded by the baffle (306) and the front panel (307) and the rear panel (309).

10. The seat back linkage device according to claim 1, characterized in that: The crank (501) is in an inclined state, and the upper end of the crank (501) is hinged to the support plate seat (2) through a third pin shaft (308); the lower end of the crank (501) is hinged to the swing bracket (3) through a first pin shaft (304); the support plate seat (2) includes a support plate (201) and vertical plates (202) hanging down on the left and right sides of the support plate (201); the chute guide mechanism (8) includes a limiting chute (801) and a second pin shaft (802), and the limiting The limiting slide groove (801) is provided on one of the vertical plate (202) or the swing bracket (3), and the second pin shaft (802) is connected to the other of the vertical plate (202) or the swing bracket (3), and the second pin shaft (802) is inserted into the limiting slide groove (801). When the connecting plate (502) drives the crank (501) to rotate synchronously, the support plate seat (2) rises and falls, and the second pin shaft (802) and the limiting slide groove (801) slide relative to each other.

11. The seat back linkage device according to claim 3, characterized in that: It also includes a swing locking mechanism (9) for limiting the swing bracket (3) to a horizontal state.

12. The seat back linkage device according to claim 11, characterized in that: The side wing (3011) includes a horizontally arranged side wing body (30111) and a wing plate (30112) vertically bent from the edge of the side wing body (30111); the side ear (1011) includes a side ear body (10111) and an ear plate (10112) vertically bent from the edge of the side ear body (10111); the swing locking mechanism (9) includes a locking pin (901); the wing plate (30112) and the ear plate (10112) are staggered up and down at some positions and the staggered parts are staggered up and down. A guide hole (30113) and a locking hole (10113) corresponding to horizontal positions are provided. The locking pin (901) is inserted into the guide hole (30113). The locking pin (901) is controlled to move. When the locking pin (901) is inserted into the guide hole (30113) and the locking hole (10113) at the same time, the swing bracket (3) is in a locked state; when the locking pin (901) leaves the locking hole (10113) and is only inserted into the guide hole (30113), the swing bracket (3) is unlocked.

13. The seat back linkage device according to claim 12, characterized in that: The ear plate (10112) includes a support ear (10114) perpendicular to the left and right side walls of the base, and the support ear (10114) continues to extend upward to form a lug (10115). The lug (10115) and the adjacent wing plate (30112) are staggered up and down, and the lug (10115) is located on the outside of the adjacent wing plate (30112). The locking hole (10113) is provided on the lug (10115), and the guide hole (30113) is provided on the wing plate (30112).

14. The seat back linkage device according to claim 12, characterized in that: The swing locking mechanism (9) includes a lock pin control mechanism (902), the lock pin control mechanism (902) includes a locking bracket (9021) fixed on the front wall of the swing bracket (3), and a second wire control (9022), the second wire control (9022) includes an outer sleeve (90221) and a pull wire (90222) that moves telescopically in the outer sleeve (90221), the outer sleeve (90221) is installed on the locking bracket (9021), and the pull wire (90222) The portion exposed from the outer sleeve (90221) is connected to a pull wire head (90223), and a compression spring (903) is provided between the pull wire head (90223) and the locking bracket (9021). The compression spring (903) is provided along the direction in which the pull wire (90222) extends. A second torsion spring (904) is symmetrically provided on the left and right sides of the pull wire head (90223). A ferrule in the middle of the second torsion spring (904) is placed on a fastening screw (905) connected to the upper part of the swing bracket (3) so that the second torsion spring (904) The whole body rotates around the fastening screw (905), and the torsion spring (904) has an elastic arm (9041) and an elastic arm (9042) respectively arranged on both sides of the fastening screw (905). The end of the elastic arm (9041) is rolled into a ring (90411), and the ring (90411) passes through the pull wire (90222) and abuts against the pull wire head (90223). The elastic arm (9042) is bent and passes through the movable hole (3012) reserved on the wing plate (30112) and then connected to the lock. Fixed pin (901); when the pull wire (90222) moves in the shortening direction, the pull wire head (90223) drives the elastic arm 1 (9041) to rotate, and at the same time the compression spring (903) is compressed to generate a reset elastic force, and the locking pin (901) moves synchronously to insert into or leave the locking hole (10113). When the pull wire (90222) is released, that is, moves in the lengthening direction, the compression spring (903) releases the elastic force to help the pull wire head (90223) and the second torsion spring (904) and the locking pin (901) to reset.

15. The seat back linkage device according to claim 8, characterized in that: It also includes a lifting and locking mechanism (7) for keeping the support plate seat (2) raised or lowered to a horizontal state.

16. The seat back linkage device according to claim 15, characterized in that: The lifting locking mechanism (7) includes a locking plate (6), the locking plate (6) is located between the third pin shaft (308) and the second pin shaft (802), the locking plate (6) is movably connected to the second pin shaft (802), the locking plate (6) is fixedly connected to the third pin shaft (308), and the front end of the locking plate (6) beyond the third pin shaft (308) is provided with a plurality of pin holes (601); the lifting locking mechanism (7) also includes opposite side vertical plates (701), the side vertical plates (701) are fixed on the front wall of the swing bracket (3), and the side vertical plates (701) is parallel to the locking plate (6), and a guide hole (7011) is provided on the side plate (701). The lifting and locking mechanism (7) further comprises a latch (705), which is inserted into the guide hole (7011). The latch (705) is controlled to move. When the latch (705) is inserted into the guide hole (7011) and the pin hole (601) at the same time, the locking plate (6) is in a locked state; when the latch (705) leaves the pin hole (601) and is only inserted into the guide hole (7011), the locking plate (6) is unlocked.

17. The seat back linkage device according to claim 15, characterized in that: The lifting and locking mechanism (7) further comprises a latch control mechanism (702), wherein the latch control mechanism (702) comprises a wire control bracket (7021) fixed to the periphery of the side stand (701), and a wire control 1 (7022), wherein the wire control 1 (7022) comprises an outer tube (70221) and a pull rope (70222) that moves telescopically within the outer tube (70221), wherein the outer tube (70221) is mounted on the wire control bracket (7021), and the pull rope (70222) is mounted on the wire control bracket (7021). The portion of the pull rope head (70223) exposed on the outer tube is connected to the pull rope head (70223), and a waist-shaped compression spring (7023) is provided between the pull rope head (70223) and the wire control bracket (7021). The waist-shaped compression spring (7023) is provided along the direction in which the pull rope (70222) extends. A torsion spring 1 (7024) is provided on the right side of the pull rope head. The middle loop of the torsion spring 1 (7024) is placed on the set screw (7025) on the upper part of the wire control bracket (7021), so that the torsion spring 1 (702 4) The entire torsion spring rotates around the set screw (7025), and the torsion spring (7024) has an elastic arm (70241) and an elastic arm (70242) respectively arranged on both sides of the set screw (7025). The end of the elastic arm (70241) is rolled into a loop (702411), and the loop (702411) passes through the pull rope (70222) and abuts against the pull rope head (70223). The elastic arm (70242) is bent and inserted into the right side of the latch (705). When the pull rope (70222) moves in the shortening direction, the elastic arm 1 (70241) is driven to rotate by the pull rope head (70223), and the waist-shaped compression spring (7023) is compressed to generate a reset elastic force, and the latch (705) moves synchronously to be inserted into the pin hole (601). When the pull rope (70222) is released, that is, moves in the lengthening direction, the waist-shaped compression spring (7023) releases the elastic force to help the pull rope head (70223), the torsion spring 1 (7024), and the latch (705) to reset.

18. The seat back linkage device according to claim 16, characterized in that: The front end of the locking plate (6) is provided with upper and lower limiting bosses (602) facing outward, and a fixing pin (603) is fixed to the upper end of the side plate (701). The fixing pin (603) protrudes from the side plate (701) toward one end of the locking plate (6) to form a limiting head (6031). When the support plate seat (2) is lifted or restored to a horizontal position, the fixing pin (603) is always located between the two bosses (602).

19. The seat back linkage device according to claim 3, characterized in that: The side wings (3011) and the side ears (1011) are arranged opposite to each other in the upper and lower parts. The elastic mechanism (4) includes an elastic rubber (404). When the side wings (3011) swing along with the swing bracket (3), the elastic rubber (404) is compressed to generate a restoring elastic force.

20. The seat back linkage device according to claim 19, characterized in that: The two ends of the elastic rubber (404) are provided with mounting posts (4041), and the two mounting posts (4041) are fixedly inserted into the holes preset in the side wings (3011) and the side ears (1011), respectively.

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