Seat-back linkage type chair seat and seat

Abstract

The invention discloses a seat-back linkage type seat and a seat, and relates to the technical field of furniture manufacturing, the seat-back linkage type seat and the seat provided by the invention have the advantages that through the design of a linkage locking unit and a seat-back connecting piece between a seat-back linkage frame and a sliding frame, the effect that the seat-back linkage frame and the sliding frame only need to naturally lean back on the seat back is realized; the seat-back linkage frame can be driven to extend out along the X-axis direction through the rotation of the chair back, so that the waist can be synchronously stretched when a user needs to lie on the back at a large angle; when a user unlocks the linkage locking unit and adjusts the angle of the chair back, the seat-back linkage frame moves in the X-axis direction relative to the sliding frame, so that a coordinated linkage relation is formed between the chair seat and the chair back; through the seat depth locking unit between the seat back linkage frame and the seat outer frame, the seat depth adjusting function of the seat outer frame in the X-axis direction under the action of external force is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of furniture manufacturing, and in particular to a seat-back linkage type chair seat and a chair. Background Art

[0002] In the prior art, the design of a chair seat usually includes a fixed seat and an adjustable backrest. When the backrest tilt angle is changed, the center of gravity of the seat will also move backward with the change of the backrest tilt angle. When the backrest tilt angle is too large, the center of gravity will tilt backward, resulting in insufficient stability, which in turn affects the safety and comfort of the seat. In order to ensure safety, designers usually need to limit the maximum tilt angle of the backrest, but this in turn limits the comfort and flexibility of the user when using the seat. Summary of the invention

[0003] The purpose of the present invention is: to address the above-mentioned problems, the present invention provides a seat-back linkage type chair seat and seat, so that when the chair back is reclined, it can synchronously drive the seat forward, and through the linkage between the seat and the chair back, it is possible to adjust the center of gravity of the seat accordingly while adjusting the inclination angle of the backrest. This design can improve the stability and comfort of the seat and extend the service life of the seat; at the same time, the seat also has the function of seat depth adjustment. The chair seat of the present invention can independently use the tilting function of the chassis, and can also independently use the synchronous sliding function of the seat back. At the same time, the sliding function and the tilting function of the chassis can be used in combination to achieve the maximum tilting angle to meet the body size and usage habits of different users.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A seat-back linkage chair seat, comprising a seat body, the seat body comprising a seat outer frame, a seat-back linkage frame, a sliding frame and a seat back; the seat outer frame is arranged above the seat-back linkage frame and is movably connected to the seat-back linkage frame along the X-axis direction; the seat-back linkage frame is arranged above the sliding frame and is movably connected to the sliding frame along the X-axis direction; the sliding frame is provided with a support frame for mounting the seat back, the seat back is rotatably connected to the support frame through a rotating shaft, and the seat back is also connected to the seat-back linkage frame through a seat-back connecting piece, one side of the seat-back connecting piece is hinged to the bottom surface of the seat back, and the other side is hinged to a side of the seat-back linkage frame close to the seat back, and when the seat back rotates around the rotating shaft, the seat-back linkage frame can be driven to move relative to the sliding frame along the X-axis direction through the seat-back connecting piece.

[0006] Furthermore, a seat depth locking unit is provided between the seat seat outer frame and the seat back linkage frame, and the seat depth locking unit can be switched between a locked state and an unlocked state. When the seat depth locking unit is in the locked state, the seat seat outer frame and the seat back linkage frame are locked together to form a linkage unit, and when the seat depth locking unit is in the unlocked state, the seat seat outer frame can move along the X-axis direction relative to the seat back linkage frame; a linkage locking unit is provided between the seat back linkage frame and the sliding frame, and the linkage locking unit can be switched between a locked state and an unlocked state. When the linkage locking unit is in the locked state, the seat back linkage frame is locked together with the sliding frame, and when the linkage locking unit is in the unlocked state, the seat back linkage frame can move along the X-axis direction relative to the sliding frame; a state adjustment unit is provided on the seat body, which can switch the states of the seat depth locking unit and the linkage locking unit.

[0007] Further, the state adjustment unit is a toggle switch, which includes a toggle switch seat, a seat depth adjustment paddle, a seat back linkage paddle, a seat depth pull wire, a linkage pull wire, a seat depth pull wire reset member, a linkage pull wire reset member, and a toggle switch shaft pin; the seat depth adjustment paddle and the seat back linkage paddle are rotatably installed in the toggle switch seat through the toggle switch shaft pin, the seat depth adjustment paddle is connected through the seat depth pull wire and acts on the seat depth locking unit, the seat back linkage paddle is connected through the linkage pull wire and acts on the linkage locking unit, the seat depth pull wire is provided with a seat depth pull wire reset member that can reset the seat depth pull wire without external force, and the linkage pull wire is provided with a linkage pull wire reset member that can reset the linkage pull wire without external force.

[0008] Furthermore, the seat depth locking unit includes a seat depth adjustment tooth groove and a seat depth adjustment locking tooth that can mesh with each other, the seat depth adjustment tooth groove is arranged on the seat seat outer frame / seat back linkage frame, and the seat depth adjustment locking tooth is arranged on the seat back linkage frame / seat seat outer frame; the linkage locking unit includes a linkage tooth groove and a linkage locking tooth that can mesh with each other, the linkage tooth groove is arranged on the seat back linkage frame / sliding frame, and the linkage locking tooth is arranged on the sliding frame / seat back linkage frame; the seat depth pull wire reset member is a seat depth adjustment reset spring, and the linkage pull wire reset member is a linkage reset spring; the seat depth pull wire is connected to and acts on the seat depth adjustment locking tooth, and the seat depth adjustment reset spring is arranged between the seat depth pull wire and the seat depth adjustment locking tooth, when the seat depth adjustment paddle rotates around the toggle switch shaft pin under the action of external force, when the seat depth pull wire is tightened, the seat depth adjustment reset spring is compressed, and the seat depth adjustment locking tooth is in a retracted state under the action of the seat depth pull wire, the seat depth locking unit is unlocked, and the seat seat outer frame can be relative to the seat back linkage frame When the seat back linkage paddle is not acted upon by external force, the seat depth adjustment reset spring is extended, and the seat depth adjustment lock tooth is in an extended state under the action of the seat depth adjustment reset spring, meshing with the corresponding seat depth adjustment tooth groove, and the seat depth locking unit is in a locked state, limiting the movement of the seat seat outer frame relative to the seat back linkage frame; the linkage pull wire is connected to and acts on the linkage lock tooth, and the linkage reset spring is arranged between the linkage pull wire and the linkage lock tooth. When the seat back linkage paddle rotates around the toggle switch shaft pin under the action of external force, when the linkage pull wire is tightened, the linkage reset spring is compressed, and the linkage lock tooth is in a retracted state under the action of the linkage pull wire, and the linkage locking unit is unlocked, and the seat back linkage frame can move relative to the sliding frame along the X-axis direction. When the seat back linkage paddle is not acted upon by external force, the linkage reset spring is extended, and the linkage lock tooth is in an extended state under the action of the linkage reset spring, meshing with the corresponding linkage tooth groove, and the linkage locking unit is in a locked state, limiting the movement of the seat back linkage frame relative to the sliding frame.

[0009] Furthermore, the seat outer frame is provided with a first slide groove in the shape of an elongated strip arranged along the X-axis direction, and a sliding pressure strip A matching it is installed in the first slide groove, and a first mounting portion that can penetrate the first slide groove is provided on the sliding pressure strip A, and the sliding pressure strip A is connected to the seat back linkage frame through the first mounting portion, and a seat tension spring is connected to the side of the seat outer frame away from the seat back along the X-axis direction, and one end of the seat tension spring limits the sliding pressure strip A and the other end is limited to the seat outer frame; the seat outer frame can overcome the elastic force of the seat tension spring under the action of external force and extend in the direction away from the seat back along the X-axis direction. At this time, the first slide groove extends out along the X-axis direction relative to the sliding pressure strip A, so that the seat tension spring is in a stretched state. When the seat outer frame loses the action of external force, the seat outer frame can retract along the X-axis direction under the action of the seat tension spring, and the seat tension spring shrinks and recovers.

[0010] Furthermore, the seat back linkage frame is provided with a second slide groove in the shape of an elongated strip arranged along the X-axis direction, and a sliding pressure strip B matching it is installed in the second slide groove, and a second mounting portion that can penetrate the second slide groove is provided on the sliding pressure strip B, and the sliding pressure strip B is connected to the sliding frame through the second mounting portion, and a seat sliding adjustment spring is provided on the side of the sliding frame close to the seat back along the X-axis direction, and one end of the seat sliding adjustment spring is limited to the seat back linkage frame and the other end is limited to the sliding frame; the seat back linkage frame can overcome the elastic force of the seat sliding adjustment spring under the action of external force and extend in the direction away from the seat back along the X-axis direction. At this time, the second slide groove extends out in the X-axis direction relative to the sliding pressure strip B, so that the seat sliding adjustment spring is in a stretched state. When the seat back linkage frame loses the action of external force, the seat back linkage frame can retract in the X-axis direction under the action of the seat sliding adjustment spring, and the seat sliding adjustment spring shrinks and recovers.

[0011] Furthermore, the sliding strip A is provided with a movable buffer portion A on the side close to the chair back along the X-axis direction, which can generate elastic deformation when abutting against the side wall of the first slide groove, and is connected to a seat tension spring on the side away from the chair back. The first slide groove is provided with a tension spring installation groove extending outward from the side away from the chair back, one end of the seat tension spring is connected to the sliding strip A, and the other end extends into the tension spring installation groove and is restricted to the outer frame of the seat; the two ends of the sliding strip B in the length direction are respectively provided with movable buffer portions B that can generate elastic deformation when abutting against the side wall of the second slide groove.

[0012] Furthermore, when the movable buffer portion A at the end of the sliding pressure strip A abuts against the side wall of the first slide groove, the first mounting portion of the sliding pressure strip A is spaced apart from the side wall of the first slide groove by a buffering distance, and the end of the first slide groove is an arc-shaped structure, and the movable buffer portion A is an arc-shaped baffle A extending from both ends of the sliding pressure strip A in the width direction to the end, and a Y-shaped hollow is formed between the two arc-shaped baffles A and the sliding pressure strip A51, and the curvature of the two arc-shaped baffles A matches the arc-shaped structure at the end of the first slide groove, and the arc-shaped baffle A can bend under the action of external force to produce elastic deformation, so that the area of ​​the Y-shaped hollow is reduced; the movable buffer portion B has the same structure as the movable buffer portion A.

[0013] Furthermore, the first slide groove is a stepped structure, and the sliding strip A is assembled in the stepped structure. The stepped structure of the first slide groove can limit the sliding strip A from escaping from the bottom of the seat frame along the Z-axis direction; the second slide groove has the same structure as the first slide groove.

[0014] Furthermore, the seat outer frame is symmetrically provided with first slide grooves at both ends along the Y-axis direction, and the pairs of sliding strips A are matched with the corresponding first slide grooves respectively; the seat back linkage frame is symmetrically provided with second slide grooves at both ends along the Y-axis direction, and the pairs of sliding strips B are matched with the corresponding second slide grooves respectively; the pairs of sliding strips A are arranged on the outside of the pairs of sliding strips B along the Y-axis direction; the upper surfaces of the seat back linkage frame and the sliding frame are provided with wheel grooves for installing rollers, the rollers can be rotatably installed in the wheel grooves, and the rollers protrude from the wheel grooves, so that the seat outer frame and the seat back linkage frame are in a rolling connection, and the seat back linkage frame and the sliding frame are in a rolling connection.

[0015] The seat-back linkage frame is equipped with a pedal member, which includes a telescopic pull rod and a foot pedal. One end of the telescopic pull rod in the length direction is telescopically connected to the seat-back linkage frame, and the other end is rotatably connected to the foot pedal through a self-locking rotary ratchet mechanism.

[0016] A seat-back linkage chair, characterized in that it includes the above-mentioned seat-back linkage chair seat and also includes a pitch chassis, the pitch chassis is adjustably connected to the seat-back linkage chair seat, and the pitch chassis is rotatably connected to the chair back through a backrest bracket.

[0017] In summary, due to the adoption of the above technical scheme, the beneficial effects of the present invention are as follows: the seat-back linkage chair seat realizes that the seat-back linkage frame can be extended along the X-axis direction by rotating the seat-back simply by naturally reclining the chair back, thereby adjusting the center of gravity of the chair, overcoming the defect of insufficient stability caused by the excessive reclining angle of the chair back. When the user unlocks the linkage locking unit and adjusts the chair back angle, the seat-back linkage frame moves relative to the sliding frame along the X-axis direction, thereby forming a coordinated linkage relationship between the seat and the chair back; at the same time, through the seat depth locking unit between the seat-back linkage frame and the seat outer frame, the seat depth adjustment function of the seat outer frame along the X-axis direction under the action of external force is realized to meet the body size and usage habits of different users. Through the coordinated design of the slide block and the roller, the movement stability is improved, the friction and heat generation are significantly reduced, thereby effectively realizing silent transmission and solving the abnormal noise problem existing in traditional roller transmission. The state adjustment unit is a toggle switch set on the seat frame. The user can adjust and lock the seat back linkage frame and the seat frame as needed by controlling the toggle switch, making the entire seat back linkage seat comfortable and easy to operate. In addition, the design of the mobile buffer and the return spring reduces the impact during the adjustment process and improves the comfort of operation. The matching design of the sliding strip and the slide groove, as well as the setting of the roller, ensures the stable connection and low-friction sliding between the various components of the seat, ensures the smoothness of the adjustment process, and improves the stability and service life of the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is an exploded view of the seat-back linkage chair seat of the present invention;

[0019] Figure 2 It is a schematic diagram of adjusting the seat of the seat-back linkage type chair seat of the present invention;

[0020] Figure 3 It is a structural schematic diagram of the outer frame of the chair seat of the present invention;

[0021] Figure 4 The present invention is about Figure 3 Sectional view in the AA direction;

[0022] Figure 5 It is a structural schematic diagram of the seat back linkage frame of the present invention;

[0023] Figure 6 The present invention is about Figure 5 Cross-sectional view in the BB direction;

[0024] Figure 7 is a cross-sectional view of the chair seat outer frame of the present invention in a retracted state;

[0025] Figure 8 is a cross-sectional view of the chair seat outer frame of the present invention in an extended state;

[0026] Fig. 9 is a top view of the seat-back linkage chair seat of the present invention;

[0027] Fig.10 The seat back linkage frame of the present invention is in a retracted state and about Fig. 9 Step section diagram in the CC direction;

[0028] Fig.11 The seat back linkage frame of the present invention is in an extended state and about Fig. 9 Step section diagram in the CC direction;

[0029] Fig.12 It is a structural schematic diagram of the linkage locking unit of the present invention in a locked state;

[0030] Fig.13 It is a structural schematic diagram of the linkage locking unit of the present invention in an unlocked state;

[0031] Fig.14 It is a structural schematic diagram of the seat-back linkage type chair of the present invention in a state where the seat does not slide and the pitch chassis does not rotate;

[0032] Fig.15 A schematic structural diagram of a seat-back linkage chair of the present invention in a state where the seat slides forward and the pitch chassis does not rotate;

[0033] Fig.16A schematic structural diagram of a seat-back linkage chair of the present invention in a state where the seat does not slide and the pitch chassis rotates;

[0034] Fig.17 A schematic structural diagram of a seat-back linkage type chair of the present invention in a state where the seat slides forward and the pitch chassis rotates.

[0035] Markings in the figure: 22-linkage return spring, 23-linkage tooth groove, 24-linkage lock tooth, 25-seat depth adjustment return spring, 26-seat depth adjustment tooth groove, 27-seat depth adjustment lock tooth, 28-seat depth pull wire, 29-seat depth locking unit, 30-sliding frame, 31-seat seat sliding adjustment spring, 32-roller, 33-linkage pull wire, 34-linkage locking unit, 35-wheel groove, 36-sliding pressure strip B, 37-seat back linkage frame, 38-movable buffer part B, 39-second slide groove, 41-slide switch seat, 42-seat depth adjustment paddle, 43-seat back linkage paddle, 44-slide switch shaft pin, 45-positioning spring, 46-positioning ball 47-seat back connector, 48-chair back, 50-seat outer frame, 51-sliding strip A, 52-seat tension spring, 53-seat cover, 54-first slide groove, 55-movable buffer part A, 56-tension spring mounting groove. DETAILED DESCRIPTION

[0036] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0037] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] Example 1

[0039] A seat-back linkage chair seat, such as Figure 1-13As shown, it includes a seat body, which includes a seat outer frame 50, a seat back linkage frame 37, a sliding frame 30 and a seat back 48; the seat outer frame 50 is arranged above the seat back linkage frame 37 and is movably connected to the seat back linkage frame 37 along the X-axis direction, and the seat cover plate 53 is fixedly installed on the upper surface of the seat outer frame 50 by cross countersunk self-tapping screws; the upper surface of the seat outer frame 50 is wrapped with a seat surface, and the seat back linkage frame 37 is arranged above the sliding frame 30 and is movably connected to the sliding frame 30 along the X-axis direction. The sliding frame 30 is provided with a support frame for mounting a seat back 48, and the seat back 48 is rotatably connected to the support frame through a rotating shaft. The seat back 48 is also connected to the seat back linkage frame 37 through a seat back connecting member 47, and one side of the seat back connecting member 47 is hinged to the bottom surface of the seat back 48, and the other side is hinged to a side of the seat back linkage frame 37 close to the seat back 48. When the seat back 48 rotates around the rotating shaft, the seat back linkage frame 37 can be driven by the seat back connecting member 47 to move relative to the sliding frame 30 along the X-axis direction.

[0040] A seat depth locking unit 29 is provided between the seat outer frame 50 and the seat back linkage frame 37. The seat depth locking unit 29 can be switched between a locked state and an unlocked state. When the seat depth locking unit 29 is in the locked state, the seat outer frame 50 and the seat back linkage frame 37 are locked together to form a linkage unit. When the seat depth locking unit 29 is in the unlocked state, the seat outer frame 50 can move relative to the seat back linkage frame 37 along the X-axis direction. The seat outer frame 50 can be adjusted in five gears, each gear has a stroke of 10 mm, and the total adjustment stroke is 50 mm. The seat back linkage frame 37 and the sliding frame 30 A linkage locking unit 34 is provided between the seat back and the sliding frame 30, and the linkage locking unit 34 can be switched between a locked state and an unlocked state. When the linkage locking unit 34 is in a locked state, the seat back linkage frame 37 is locked together with the sliding frame 30. When the linkage locking unit 34 is in an unlocked state, the seat back linkage frame 37 can move relative to the sliding frame 30 along the X-axis direction. The seat back linkage frame 37 is adjustable in five gears, each gear has a stroke of 10 mm, and the total adjustment stroke is 50 mm. A state adjustment unit that can switch the states of the seat depth locking unit 29 and the linkage locking unit 34 is provided on the chair seat body.

[0041] The state adjustment unit is a toggle switch, which is arranged on the seat outer frame 50. The toggle switch includes a toggle switch seat 41, a seat depth adjustment paddle 42, a seat back linkage paddle 43, a seat depth pull wire 28, a linkage pull wire 33, a seat depth pull wire reset member, a linkage pull wire reset member, and a toggle switch shaft pin 44; the seat depth adjustment paddle 42 and the seat back linkage paddle 43 are rotatably installed in the toggle switch seat 41 through the toggle switch shaft pin 44, and the seat depth adjustment paddle 42 is connected to the seat depth pull wire 28 and acts on the seat depth locking unit. Element 29, the seat back linkage paddle 43 is connected through the linkage wire 33 and acts on the linkage locking unit 34, the seat depth wire 28 is provided with a seat depth wire reset member capable of resetting the seat depth wire 28 without external force, and the linkage wire 33 is provided with a linkage wire reset member capable of resetting the linkage wire 33 without external force; the seat depth adjustment paddle 42 is provided with a positioning groove, and a positioning spring 45 is also assembled in the toggle switch seat 41, and a positioning ball 46 matching the positioning groove is installed on one side of the positioning spring 45. When the seat depth adjustment paddle 42 is moved up, the positioning ball 46 matches the positioning groove on the seat depth adjustment paddle 42. Under the action of the positioning spring 45, the positioning ball 46 can press against the positioning groove on the seat depth adjustment paddle 42, so that the seat depth adjustment paddle 42 maintains the moved up state, which is convenient for seat depth adjustment. After the seat depth adjustment is completed, the seat depth adjustment paddle 42 can be manually moved down, so that the positioning groove overcomes the elastic constraint of the positioning spring 45 and disengages from the positioning ball 46, and the seat depth pull wire reset member acts on the seat depth pull wire 28 to reset it.

[0042] A seat depth locking unit 29 is provided between the seat outer frame 50 and the seat back linkage frame 37, and the seat depth locking unit 29 can be switched between a locked state and an unlocked state. When the seat depth locking unit 29 is in the locked state, the seat outer frame 50 and the seat back linkage frame 37 are locked together to form a linkage unit. When the seat depth locking unit 29 is in the unlocked state, the seat outer frame 50 can move along the X-axis direction relative to the seat back linkage frame 37; a linkage locking unit 34 is provided between the seat back linkage frame 37 and the sliding frame 30, and the linkage locking unit 34 can be switched between a locked state and an unlocked state. When the linkage locking unit 34 is in the locked state, the seat back linkage frame 37 is locked together with the sliding frame 30. When the linkage locking unit 34 is in the unlocked state, the seat back linkage frame 37 can move along the X-axis direction relative to the sliding frame 30.

[0043] The seat depth locking unit 29 includes a seat depth adjustment locking tooth 27 and a seat depth adjustment tooth groove 26 that can mesh with each other. The seat depth adjustment locking tooth 27 is movably connected to the seat back linkage frame 37. The seat depth pull wire 28 is connected to the seat depth adjustment locking tooth 27. A seat depth adjustment reset spring 25 is also provided between the seat depth pull wire 28 and the seat depth adjustment locking tooth 27. When the seat depth pull wire 28 is tightened, the seat depth adjustment reset spring 25 is compressed, and the seat depth adjustment locking tooth 27 is in a retracted state under the action of the seat depth pull wire 28. When the seat depth pull wire 28 is not tightened, the seat depth adjustment reset spring 25 is extended, and the seat depth adjustment locking tooth 27 is in a retracted state under the action of the seat depth adjustment reset spring 25. The seat depth adjustment tooth groove 26 is arranged on the seat outer frame 50, and when the seat depth adjustment paddle 42 is pulled up, the seat depth adjustment locking tooth 27 can be acted on by the seat depth pull line 28, so that the seat depth adjustment locking tooth 27 is disengaged from the seat depth adjustment tooth groove 26, so that the seat depth locking unit 29 is unlocked, and the seat outer frame 50 can slide relative to the seat back linkage frame 37 at this time; after completing the adjustment of the seat outer frame 50, release the seat depth adjustment paddle 42, and the seat depth adjustment locking tooth 27 is extended under the action of the seat depth adjustment reset spring 25, and meshes with the corresponding seat depth adjustment tooth groove 26, and the seat depth locking unit 29 is locked again, and the adjustment of the seat depth of the seat outer frame 50 is completed.

[0044] The linkage locking unit 34 has a similar structural principle to the seat depth locking unit 29, including a linkage lock tooth 24 and a linkage tooth groove 23 that can mesh with each other. The linkage lock tooth 24 can be movably connected to the sliding frame 30, and the linkage pull wire 33 is connected to the linkage lock tooth 24. A linkage reset spring 22 is also provided between the linkage pull wire 33 and the linkage lock tooth 24. When the linkage pull wire 33 is tightened, the linkage reset spring 22 is compressed, and the linkage lock tooth 24 is in a retracted state under the action of the linkage pull wire 33. When the linkage pull wire 33 is not tightened, the linkage reset spring 22 is extended, and the linkage lock tooth 24 is in a retracted state under the action of the linkage reset spring 22. In the extended state; the linkage tooth groove 23 is arranged on the seat back linkage frame 37. When the seat back linkage paddle 43 is pulled up, the linkage lock tooth 24 can be acted on by the linkage pull wire 33, so that the linkage lock tooth 24 is disengaged from the linkage tooth groove 23, so that the linkage locking unit 34 is unlocked. At this time, the rotation of the seat back 48 can drive the seat back linkage frame 37 to move relative to the sliding frame 30; after completing the adjustment of the seat back linkage frame 37, release the seat back linkage paddle 43, and the linkage lock tooth 24 is extended under the action of the linkage reset spring 22, meshing with the corresponding linkage tooth groove 23, and the linkage locking unit 34 is locked again, completing the linkage adjustment of the seat back 48 and the seat surface.

[0045] The seat outer frame 50 is provided with a long first slide groove 54 at both ends along the Y-axis direction, and the paired sliding strips A51 are matched with the corresponding first slide grooves 54 respectively. The sliding strip A51 is provided with a first mounting portion that can penetrate the first slide groove 54. The first mounting portion is arranged at both ends of the sliding strip A51 in the length direction. Screws can be assembled in the first mounting portion so that the sliding strip A51 is fixedly installed on the seat back linkage frame 37. The two ends of the sliding strip A51 in the length direction are matched with the ends of the first slide groove 54 respectively. The sliding strip A51 is provided with a movable buffer portion A55 on the side close to the seat back 48 along the X-axis direction, which can generate elastic deformation when abutting against the side wall of the first slide groove 54. The side away from the seat back 48 is connected with a seat tension spring 52. The first slide groove 54 is away from the seat back. A tension spring mounting groove 56 extends outward from one side of 48, one end of the seat tension spring 52 is connected to the sliding pressure strip A51, and the other end extends into the tension spring mounting groove 56 and is connected to the seat outer frame 50. Specifically, the end of the first slide groove 54 is an arc-shaped structure, and the movable buffer part A55 is an arc-shaped baffle A extending from both ends of the sliding pressure strip A51 in the width direction to the end, and a Y-shaped hollow is formed between the two arc-shaped baffles A and the sliding pressure strip A51. The curvature of the two arc-shaped baffles A matches the arc-shaped structure at the end of the first slide groove 54. When the seat outer frame 50 is in the extreme position, the arc-shaped baffle A abuts against the side wall of the first slide groove 54. Under the further action of external force, the arc-shaped baffle A bends, so that the area of ​​the Y-shaped hollow is reduced, thereby completing the elastic deformation of the movable buffer part A55. The width of the sliding strip A51 matches the width of the first slide groove 54 on the seat outer frame 50, and a groove A is provided in the width direction of the sliding strip A51 to reduce the friction between the side of the sliding strip A51 in the width direction and the first slide groove 54. When the movable buffer portion A55 at the end of the sliding strip A51 abuts against the side wall of the first slide groove 54, the first mounting portion of the sliding strip A51 is separated from the side wall of the first slide groove 54 by a buffering distance. The first slide groove 54 is a stepped structure, which not only avoids the buffering distance from being too large, but also prevents the sliding strip A51 from escaping from the bottom of the seat outer frame 50, so that the seat outer frame 50 and the seat back linkage frame 37 can be slidably connected and form an integral structure. When the seat outer frame 50 slides, the sliding direction and sliding stroke of the seat outer frame 50 horizontally along the X-axis direction are fixed through the sliding cooperation between the first slide groove 54 on the seat outer frame 50 and the sliding strip A51 fixed on the seat back linkage frame 37.

[0046] When there is no external force acting on the seat outer frame 50, the seat outer frame 50 is in the initial position under the action of the seat tension spring 52, and the sliding pressure strip A51 is located on the side of the first slide groove 54 away from the seat back 48. When the seat outer frame 50 is subjected to an external force in the direction away from the seat back 48, the seat outer frame 50 overcomes the elastic force of the seat tension spring 52 and extends in the X-axis direction away from the seat back 48. The first slide groove 54 extends in the X-axis direction relative to the sliding pressure strip A, and the seat tension spring 52 stretches. When the seat outer frame 50 approaches the extended limit position, the movable buffer portion A55 at the end of the sliding pressure strip A51 first abuts against the side wall of the first slide groove 54. At this time, the first mounting portion of the sliding pressure strip A51 is separated from the side wall of the first slide groove 54 by a buffering distance. The seat outer frame 50 continues to extend outward, and the movable buffer portion A55 is elastically deformed by the force. Finally, the first mounting portion of the sliding strip A51 is brought into contact with the side wall of the first slide groove 54, thereby achieving buffering when the seat outer frame 50 is adjusted to the extended limit position. When there is no external force, the seat outer frame can be retracted along the X-axis direction under the action of the seat tension spring, and the seat tension spring returns to its original state, while driving the seat outer frame 50 to return to its initial position under the elastic force of the seat tension spring 52. Since the seat tension spring 52 can form an elastic support, there is no need to set a movable buffer portion A55 on the side of the sliding strip A51 corresponding to the seat tension spring 52. In this way, the impact when the seat outer frame 50 is adjusted to the limit position is reduced, thereby improving the comfort of the user during adjustment.

[0047] The two ends of the seat back linkage frame 37 along the Y-axis direction are respectively provided with a second long-strip shaped slide groove 39, and the paired sliding pressure strips B36 are respectively matched with the corresponding second slide grooves 39, and the sliding pressure strips B36 are respectively provided with a second mounting portion that can penetrate the second slide groove 39, and the second mounting portion is arranged at both ends of the sliding pressure strip B36 in the length direction, and screws can be assembled in the second mounting portion, so that the sliding pressure strip B36 is fixedly installed on the sliding frame 30, and the two ends of the sliding pressure strip B36 in the length direction are respectively matched with the end of the second slide groove 39, and the two ends of the sliding pressure strip B36 in the length direction are respectively provided with a movable buffer portion B that can generate elastic deformation when abutting against the side wall of the second slide groove 39 38, specifically, the end of the second slide groove 39 is an arc-shaped structure, and each of the movable buffer parts B38 has the same structure as the movable buffer part A55, which is an arc-shaped baffle B extending from both ends of the sliding pressure strip B36 in the width direction to the end, and a Y-shaped hollow is formed between the two arc-shaped baffles B and the sliding pressure strip B36. The curvature of the two arc-shaped baffles B matches the arc-shaped structure of the end of the second slide groove 39. When the seat back linkage frame 37 is at the extreme position, the arc-shaped baffle B abuts against the side wall of the second slide groove 39. Under the further action of external force, the arc-shaped baffle B bends, so that the area of ​​the Y-shaped hollow is reduced, thereby completing the elastic deformation of the movable buffer part B38. The width of the sliding pressure strip B36 matches the width of the second slide groove 39 on the seat back linkage frame 37, and a groove B is provided in the width direction of the sliding pressure strip B36 to reduce the friction between the side of the sliding pressure strip B36 in the width direction and the second slide groove 39. When the movable buffer portion B38 at the end of the sliding pressure strip B36 abuts against the side wall of the second slide groove 39, the second mounting portion of the sliding pressure strip B36 is separated from the side wall of the second slide groove 39 by a buffering distance, and the second slide groove 39 is a stepped structure, which not only avoids the buffering distance being too large, but also prevents the sliding pressure strip B36 from slipping out from under the seat back linkage frame 37, so that the seat back linkage frame 37 and the sliding frame 30 can be slidably connected and form an integral structure. When the seat back linkage frame 37 slides, the sliding direction and sliding stroke of the seat back linkage frame 37 are fixed horizontally along the X-axis direction through the sliding cooperation between the second slide groove 39 on the seat back linkage frame 37 and the sliding pressure strip B36 fixed on the sliding frame 30. One end of the seat sliding adjustment spring 31 is assembled on the seat back linkage frame 37, and the other end is assembled on the sliding pressure strip B36. When the seat back linkage frame 37 slides, the sliding direction and sliding stroke of the seat back linkage frame 37 are fixed horizontally along the X-axis direction through the sliding cooperation between the second sliding groove 39 on the seat back linkage frame 37 and the sliding pressure strip B36 fixed on the sliding frame 30.

[0048] When there is no external force acting on the seat back linkage frame 37, the seat back linkage frame 37 is located in the initial position under the action of the seat sliding adjustment spring 31, and the sliding pressure strip B36 is located on the side of the second slide groove 39 away from the seat back 48. When the seat back linkage frame 37 is subjected to an external force in the direction away from the seat back 48, the seat back linkage frame 37 overcomes the elastic force of the seat sliding adjustment spring 31 and extends in the direction away from the seat back 48, and the seat sliding adjustment spring 31 is compressed. When the seat back linkage frame 37 approaches the extended limit position, the moving buffer portion B38 at the end of the sliding pressure strip B36 first abuts against the side wall of the second slide groove 39, and the second mounting portion of the sliding pressure strip B36 is separated from the side wall of the second slide groove 39 by a buffering distance, and the seat back linkage frame 37 continues to extend outward, and the moving buffer portion B38 at the end of the sliding pressure strip B36 first abuts against the side wall of the second slide groove 39. The punching portion B38 is subjected to force and produces elastic deformation, which eventually causes the second mounting portion of the sliding strip B36 to abut against the side wall of the second slide groove 39, thereby achieving buffering when the seat back linkage frame 37 is adjusted to the extended limit position. When there is no external force, the seat back linkage frame 37 returns to its initial position under the elastic force of the seat sliding adjustment spring 31, and the movable buffer portion B38 away from the side of the seat back 48 completes the buffering when the seat back linkage frame 37 moves to the retracted position. In this way, the impact when the seat back linkage frame 37 is adjusted to the limit position is reduced, thereby improving the comfort of the user when adjusting.

[0049] The upper surfaces of the seat back linkage frame 37 and the sliding frame 30 are both provided with a wheel groove 35 for installing the roller 32, and the roller 32 can be rotatably installed in the wheel groove 35, and the roller 32 protrudes from the wheel groove 35, so that the seat outer frame 50 and the seat back linkage frame 37 are in rolling connection, and the seat back linkage frame 37 and the sliding frame 30 are in rolling connection, which effectively reduces the friction force when the seat outer frame 50, the seat back linkage frame 37, and the sliding frame 30 are in relative motion. Among them, four rollers 32 are provided between the seat outer frame 50 and the seat back linkage frame 37, and the pairs of rollers 32 are correspondingly arranged at the two ends of the length direction of the sliding pressure strip A51; four rollers 32 are provided between the seat back linkage frame 37 and the sliding frame 30, and the pairs of rollers 32 are correspondingly arranged at the two ends of the length direction of the sliding pressure strip B36.

[0050] The seat-back linkage frame 37 is equipped with a pedal member, which includes a telescopic pull rod and a foot pedal. One end of the telescopic pull rod in the length direction is telescopically connected to the seat-back linkage frame, and the other end is rotatably connected to the foot pedal through a self-locking rotary ratchet mechanism.

[0051] When the user pulls the foot pedal, the foot pedal extends from the seat-back linkage frame 37 through the telescopic pull rod, and the foot pedal is rotated upward. When the foot pedal is rotated to a set angle, the self-locking rotary ratchet mechanism can be automatically locked. Usually, the set angle keeps the foot pedal in a horizontal state, so that the foot pedal can be used for load bearing; when the user does not use the foot pedal, the foot pedal continues to be rotated upward so that the rotation angle of the foot pedal is greater than the set angle, and the self-locking rotary ratchet mechanism can be unlocked, so that the foot pedal can be rotated downward to reset to the initial downward state. The self-locking rotary ratchet mechanism is a prior art, and its structure and working principle are not described in detail here.

[0052] Example 2

[0053] A seat-back linkage chair, such as Figure 14-17 As shown, it includes the seat-back linkage chair seat described in Example 1, and also includes a pitch chassis, the pitch chassis is adjustably connected to the seat-back linkage chair seat, and the pitch chassis is rotatably connected to the chair back 48 through the backrest bracket. The pitch chassis is a prior art, and reference can be made to the patent previously applied for by the applicant, application number: 202323190954.7, invention name: An adjustable chair back and a chair with an adjustable chair back, such as Fig.14 As shown, when the seat-back linkage chair seat is in the initial state, the angle between the seat back 48 and the horizontal plane is 98°. In the prior art, Fig.16 As shown, the pitch base can be unlocked and tilted backward until the angle between the chair back 48 and the horizontal plane is 134°. Due to the use of the seat-back linkage chair seat described in Example 1, as shown in FIG. Fig.17 As shown, the seat back 48 can further increase the tilt angle to 156°, and the seat back linkage frame 37 and the seat seat outer frame 50 can extend forward to move the center of gravity forward, so that the seat back linkage type seat can achieve a larger tilt angle while ensuring safety and avoiding the risk of tipping over due to excessive backward movement of the tilt center of gravity. Of course, the tilt chassis can also be locked, and the seat back 48 can be adjusted only through the seat back linkage seat, such as Fig.15 As shown, by using the seat-back linkage chair seat alone, the seat back 48 can obtain a tilt angle of 120°.

[0054] The principles and implementation methods of the present invention are described in this article using specific embodiments. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0055] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0056] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A seat-back linkage chair seat, comprising a chair seat body, characterized in that: The seat body includes a seat outer frame, a seat back linkage frame, a sliding frame and a seat back; the seat outer frame is arranged above the seat back linkage frame and is movably connected to the seat back linkage frame along the X-axis direction; the seat back linkage frame is arranged above the sliding frame and is movably connected to the sliding frame along the X-axis direction; the sliding frame is provided with a support frame for mounting the seat back, the seat back is rotatably connected to the support frame through a rotating shaft, and the seat back is also connected to the seat back linkage frame through a seat back connecting piece, one side of the seat back connecting piece is hinged to the bottom surface of the seat back, and the other side is hinged to a side of the seat back linkage frame close to the seat back, and when the seat back rotates around the rotating shaft, the seat back linkage frame can be driven to move relative to the sliding frame along the X-axis direction through the seat back connecting piece.

2. The seat-back linkage chair seat as claimed in claim 1, characterized in that: A seat depth locking unit is provided between the seat outer frame and the seat back linkage frame, and the seat depth locking unit can be switched between a locked state and an unlocked state. When the seat depth locking unit is in the locked state, the seat outer frame and the seat back linkage frame are locked together to form a linkage unit, and when the seat depth locking unit is in the unlocked state, the seat outer frame can move relative to the seat back linkage frame along the X-axis direction; a linkage locking unit is provided between the seat back linkage frame and the sliding frame, and the linkage locking unit can be switched between a locked state and an unlocked state. When the linkage locking unit is in the locked state, the seat back linkage frame is locked together with the sliding frame, and when the linkage locking unit is in the unlocked state, the seat back linkage frame can move relative to the sliding frame along the X-axis direction; a state adjustment unit is provided on the seat body, which can switch the states of the seat depth locking unit and the linkage locking unit.

3. The seat-back linkage chair seat as claimed in claim 2, characterized in that: The state adjustment unit is a toggle switch, which includes a toggle switch seat, a seat depth adjustment paddle, a seat back linkage paddle, a seat depth pull wire, a linkage pull wire, a seat depth pull wire reset member, a linkage pull wire reset member, and a toggle switch shaft pin; the seat depth adjustment paddle and the seat back linkage paddle are rotatably installed in the toggle switch seat through the toggle switch shaft pin, the seat depth adjustment paddle is connected through the seat depth pull wire and acts on the seat depth locking unit, the seat back linkage paddle is connected through the linkage pull wire and acts on the linkage locking unit, the seat depth pull wire is provided with a seat depth pull wire reset member that can reset the seat depth pull wire without external force, and the linkage pull wire is provided with a linkage pull wire reset member that can reset the linkage pull wire without external force.

4. The seat-back linkage chair seat as claimed in claim 3, characterized in that; The seat depth locking unit includes a seat depth adjustment tooth groove and a seat depth adjustment locking tooth that can mesh with each other, the seat depth adjustment tooth groove is arranged on the seat seat outer frame / seat back linkage frame, and the seat depth adjustment locking tooth is arranged on the seat back linkage frame / seat seat outer frame; the linkage locking unit includes a linkage tooth groove and a linkage locking tooth that can mesh with each other, the linkage tooth groove is arranged on the seat back linkage frame / sliding frame, and the linkage locking tooth is arranged on the sliding frame / seat back linkage frame; the seat depth pull wire reset member is a seat depth adjustment reset spring, and the linkage pull wire reset member is a linkage reset spring; the seat depth pull wire is connected and acts on the seat depth adjustment locking tooth, and the seat depth adjustment reset spring is arranged between the seat depth pull wire and the seat depth adjustment locking tooth, and when the seat depth adjustment paddle rotates around the toggle switch shaft pin under the action of external force, when the seat depth pull wire is tightened, the seat depth adjustment reset spring is compressed, and the seat depth adjustment locking tooth is in a retracted state under the action of the seat depth pull wire, the seat depth locking unit is unlocked, and the seat seat outer frame can be relative to the seat back linkage frame along the X-axis When the seat back linkage paddle is not acted upon by external force, the linkage reset spring extends, and the linkage lock tooth is in an extended state under the action of the linkage reset spring, meshing with the corresponding seat depth adjustment tooth groove, and the seat depth locking unit is in a locked state, limiting the movement of the seat back linkage frame relative to the seat back linkage frame; the linkage pull wire is connected and acts on the linkage lock tooth, and the linkage reset spring is arranged between the linkage pull wire and the linkage lock tooth. When the seat back linkage paddle rotates around the toggle switch shaft pin under the action of external force, when the linkage pull wire is tightened, the linkage reset spring is compressed, and the linkage lock tooth is in a retracted state under the action of the linkage pull wire, and the linkage locking unit is unlocked, and the seat back linkage frame can move relative to the sliding frame along the X-axis direction. When the seat back linkage paddle is not acted upon by external force, the linkage reset spring extends, and the linkage lock tooth is in an extended state under the action of the linkage reset spring, meshing with the corresponding linkage tooth groove, and the linkage locking unit is in a locked state, limiting the movement of the seat back linkage frame relative to the sliding frame.

5. The seat-back linkage chair seat according to any one of claims 1 to 4, characterized in that: The seat outer frame is provided with a first slide groove in the shape of an elongated strip arranged along the X-axis direction, and a sliding pressure strip A matching it is installed in the first slide groove, and the sliding pressure strip A is provided with a first mounting portion that can penetrate the first slide groove, and the sliding pressure strip A is connected to the seat back linkage frame through the first mounting portion, and the seat outer frame is connected to a seat tension spring on the side away from the seat back along the X-axis direction of the seat outer frame, and one end of the seat tension spring limits the sliding pressure strip A and the other end is limited to the seat outer frame; the seat outer frame can overcome the elastic force of the seat tension spring under the action of external force and extend in the direction away from the seat back along the X-axis direction. At this time, the first slide groove extends relative to the sliding pressure strip A in the X-axis direction, so that the seat tension spring is in a stretched state. When the seat outer frame loses the external force, the seat outer frame can be retracted in the X-axis direction under the action of the seat tension spring, and the seat tension spring shrinks and recovers; the seat back linkage frame is provided with a There is a second slide groove in the shape of an elongated strip arranged along the X-axis direction, and a sliding pressure strip B matching it is installed in the second slide groove, and a second mounting portion that can penetrate the second slide groove is provided on the sliding pressure strip B, and the sliding pressure strip B is connected to the sliding frame through the second mounting portion, and a seat sliding adjustment spring is provided on the side of the sliding frame close to the seat back along the X-axis direction, and one end of the seat sliding adjustment spring is limited to the seat back linkage frame and the other end is limited to the sliding frame; the seat back linkage frame can overcome the elastic force of the seat sliding adjustment spring under the action of external force and extend in the direction away from the seat back along the X-axis direction. At this time, the second slide groove extends out in the X-axis direction relative to the sliding pressure strip B, so that the seat sliding adjustment spring is in a stretched state. When the seat back linkage frame loses the action of external force, the seat back linkage frame can retract in the X-axis direction under the action of the seat sliding adjustment spring, and the seat sliding adjustment spring shrinks and recovers.

6. The seat-back linkage chair seat as claimed in claim 5, characterized in that: The sliding strip A is provided with a movable buffer part A which can generate elastic deformation when abutting against the side wall of the first slide groove on the side close to the chair back along the X-axis direction, and is connected with a seat tension spring on the side away from the chair back. A tension spring mounting groove extends outward from the side of the first slide groove away from the chair back, one end of the seat tension spring is connected to the sliding strip A, and the other end extends into the tension spring mounting groove and is restricted to the outer frame of the seat; the two ends of the sliding strip B in the length direction are respectively provided with movable buffer parts B which can generate elastic deformation when abutting against the side wall of the second slide groove.

7. The seat-back linkage chair seat as claimed in claim 6, characterized in that: When the movable buffer portion A at the end of the sliding pressure strip A abuts against the side wall of the first slide groove, the first mounting portion of the sliding pressure strip A is spaced apart from the side wall of the first slide groove by a buffer spacing, the end of the first slide groove is an arc-shaped structure, and the movable buffer portion A is an arc-shaped baffle A extending from both ends of the sliding pressure strip A in the width direction to the end, and a Y-shaped hollow is formed between the two arc-shaped baffles A and the sliding pressure strip A51, and the curvature of the two arc-shaped baffles A matches the arc-shaped structure at the end of the first slide groove, and the arc-shaped baffle A can be bent under the action of external force to produce elastic deformation, so that the area of ​​the Y-shaped hollow is reduced; the movable buffer portion B has the same structure as the movable buffer portion A; the first slide groove is a stepped structure, and the sliding pressure strip A is assembled in the stepped structure, and the stepped structure of the first slide groove can limit the sliding pressure strip A from the bottom of the seat outer frame to escape from the first slide groove along the Z-axis direction; The second sliding groove has the same structure as the first sliding groove.

8. The seat-back linkage chair seat according to any one of claims 5 to 7, characterized in that: The seat outer frame is symmetrically provided with first sliding grooves at both ends along the Y-axis direction, and the pairs of sliding strips A are matched with the corresponding first sliding grooves respectively. The seat back linkage frame is symmetrically provided with second sliding grooves at both ends along the Y-axis direction, and the pairs of sliding strips B are matched with the corresponding second sliding grooves respectively; the pairs of sliding strips A are arranged on the outside of the pairs of sliding strips B along the Y-axis direction.

9. The seat-back linkage chair seat as claimed in claim 1, characterized in that: The seat-back linkage frame is equipped with a pedal member, which includes a telescopic pull rod and a foot pedal. One end of the telescopic pull rod in the length direction is telescopically connected to the seat-back linkage frame, and the other end is rotatably connected to the foot pedal through a self-locking rotary ratchet mechanism.

10. A seat-back linkage chair, characterized in that: It comprises the seat-back linkage chair seat as claimed in any one of claims 1 to 9, and also comprises a pitch chassis, the pitch chassis is adjustably connected to the seat-back linkage chair seat, and the pitch chassis is rotatably connected to the chair back via a backrest bracket.

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