阅读说明：本技术 一种用于座具的座腰同步联动装置及座具 (Seat waist synchronous linkage device for seat and seat ) 是由 何基 虞红潮 蒋小兵 于 2019-02-03 设计创作，主要内容包括：本发明公开了一种用于座具的座腰同步联动装置及座具,包括：底座；座框,设置于底座上方；前、后连杆,前、后连杆与底座、座框组成四连杆机构,座框在前、后连杆支撑与导向作用下可相对于底座运动并在空载位置和就坐位置之间进行状态转换；腰支架,且所述腰支架与座框或底座滑动连接,腰支架具有初始位置与顶腰位置；滑移导引机构,带动腰支架沿座框或底座中的一个滑动同时相应的使腰支架与座框或底座中的一个之间产生相对位移；本发明在水平方向腰支架相对于底座的行程大于座框相对于底座的行程,也就是腰支架行程更大,从而可以在人体就坐时快速顶到人体腰部,达到支撑腰部的目的。(The invention discloses a seat waist synchronous linkage device for a seat and the seat, comprising: a base; the seat frame is arranged above the base; the seat frame can move relative to the base under the supporting and guiding action of the front connecting rod and the rear connecting rod and can perform state conversion between an idle position and a sitting position; the waist support is connected with the seat frame or the base in a sliding manner and is provided with an initial position and a waist supporting position; the sliding guide mechanism drives the waist support to slide along one of the seat frame or the base and correspondingly causes the waist support and the one of the seat frame or the base to generate relative displacement; the stroke of the waist support relative to the base in the horizontal direction is larger than that of the seat frame relative to the base, namely the stroke of the waist support is larger, so that the waist support can quickly prop up the waist of a human body when the human body sits, and the aim of supporting the waist is fulfilled.)

1. A seat waist synchronous linkage device for a seating furniture, characterized by including:

the base is used for supporting the whole device;

the seat frame is used for configuring a seat cushion and is arranged above the base;

the two ends of the front connecting rod are respectively hinged with the front end of the seat frame and the front end of the base, and the two ends of the rear connecting rod are respectively hinged with the rear end of the seat frame and the rear end of the base; the front and rear connecting rods, the base and the seat frame form a four-bar linkage mechanism, and the seat frame can move relative to the base under the supporting and guiding action of the front and rear connecting rods and can perform state conversion between an idle position and a sitting position; in the no-load position, the seat frame is upward far away from the base, and a larger elevation angle is formed between the front connecting rod and the base and between the rear connecting rod and the base; in the sitting position, the seat frame is downward close to the base, and a smaller elevation angle is formed between the front connecting rod and the base and between the rear connecting rod and the base;

the waist support is used for configuring a waist rest and is connected with the seat frame or the base in a sliding manner, and the waist support has an initial position and a waist supporting position;

and the sliding guide mechanism responds to the movement of the seat frame and drives the waist support to slide along one of the seat frame or the base while correspondingly enabling the waist support to generate relative displacement with the other of the seat frame or the base.

2. The lumbar synchronization linkage of claim 1, wherein: when the seat frame is shifted from the idling position to the sitting position, the seat frame is moved in the horizontal direction while being lowered relative to the base.

3. The lumbar synchronization linkage of claim 1, wherein: when the lumbar support slides along one of the seat frame or the base, the displacement of the lumbar support relative to the base in the horizontal direction is larger than the displacement of the seat frame relative to the base.

4. The lumbar synchronization linkage of claim 1, wherein: the sliding guide mechanism comprises a connecting rod group which can extend or contract along the horizontal direction, and an upper sliding groove and a lower sliding groove which guide the connecting rod group; the connecting rod group is arranged between the upper sliding groove and the lower sliding groove and comprises a plurality of connecting rods which are sequentially hinged; the upper sliding groove is a linear groove and is arranged on the seat frame along the length direction of the seat frame, and the lower sliding groove is a linear groove and is arranged on the base along the length direction of the base; the connecting rod group is hinged with the base, the hinged point of the connecting rod group and the base does not move, and the connecting rod group is also hinged with the waist support to drive the waist support to slide along one of the seat frame or the base.

5. Seat waist synchronous linkage according to claim 4, characterized in that: the connecting rod group is provided with a head part and a tail part, the head part of the connecting rod group is hinged with the waist support through a driving shaft, and the tail part of the connecting rod group is hinged with the base through a limiting shaft; and two adjacent connecting rods are hinged through a hinge shaft; the driving shaft and the hinge shaft are respectively and correspondingly inserted into the upper sliding groove or the lower sliding groove according to the positions of the driving shaft and the hinge shaft.

6. Seat waist synchronous linkage according to claim 4, characterized in that: wing plates extending downwards are arranged on the left side and the right side of the seat frame, and the upper sliding groove is arranged on the wing plates along the length direction of the seat frame; the left and right sides of base is equipped with the curb plate that extends up, lower sliding tray set up on the curb plate along base length direction.

7. Seat waist synchronous linkage according to claim 5, characterized in that: the waist support comprises a vertical support and a transverse support, the lateral part of the transverse support is provided with a linear guide groove along the length direction of the transverse support, the transverse support is inserted into the seat frame, and a hinge shaft positioned in the upper sliding groove is simultaneously inserted into the guide groove.

8. The lumbar synchronization linkage of claim 7, wherein: the articulated shaft is a long shaft and penetrates through the left side and the right side of the seat frame or the base.

9. The lumbar synchronization linkage of claim 7, wherein: the driving shaft is a long shaft and penetrates through the left side and the right side of the seat frame or the base.

10. Seat waist synchronous linkage according to claim 4, characterized in that: the connecting rod group comprises at least 3 connecting rods, and two adjacent connecting rods form a V shape.

11. The lumbar synchronization linkage of claim 10, wherein: the connecting rod group comprises 4-6 connecting rods.

12. Seat waist synchronous linkage according to claim 1 or 4, characterized in that: the waist support comprises a vertical support and a transverse support, and the transverse support is inserted into the seat frame and is in sliding fit with the seat frame through a sliding rail.

13. The lumbar synchronization linkage of claim 1, wherein: the seat frame is arranged parallel to the base, and is always parallel to the base when the seat frame is switched between the no-load position and the sitting position.

14. A seat waist synchronous linkage device for a seating furniture, characterized by including:

the base is used for supporting the whole device;

the seat frame is used for configuring a seat cushion and is arranged above the base;

the two ends of the front connecting rod are respectively hinged with the front end of the seat frame and the front end of the base, and the two ends of the rear connecting rod are respectively hinged with the rear end of the seat frame and the rear end of the base; the front and rear connecting rods, the base and the seat frame form a four-bar linkage mechanism, and the seat frame can move relative to the base under the supporting and guiding action of the front and rear connecting rods and can perform state conversion between an idle position and a sitting position; in the no-load position, the seat frame is upward far away from the base, and a larger elevation angle is formed between the front connecting rod and the base and between the rear connecting rod and the base; in the sitting position, the seat frame is downward close to the base, and a smaller elevation angle is formed between the front connecting rod and the base and between the rear connecting rod and the base;

the waist support is used for configuring a waist rest and is connected with the seat frame or the base in a sliding manner, and the waist support has an initial position and a waist supporting position;

the sliding guide mechanism responds to the movement of the seat frame and drives the waist support to slide along one of the seat frame or the base while correspondingly enabling the waist support to generate relative displacement with the other of the seat frame or the base;

and the elastic resetting device is used for assisting the seat frame to move from the sitting position to the no-load position and synchronously assisting the waist support to move from the waist supporting position to the initial position.

15. The lumbar synchronization linkage of claim 14, wherein: the elastic reset device is a spring.

16. The lumbar synchronization linkage of claim 15, wherein: the spring is a pressure spring, one end of the spring is restrained on the seat frame, and the other end of the spring is restrained on the base.

17. The lumbar synchronization linkage of claim 16, wherein: the two ends of the spring are respectively sleeved with a first guide sleeve and a second guide sleeve, the first guide sleeve is hinged with a first supporting rod penetrating through the left side and the right side of the base, and the second guide sleeve is hinged with a second supporting rod penetrating through the left side and the right side of the seat frame.

18. The lumbar synchronization linkage of claim 15, wherein: the spring is a pressure spring, one end of the spring is restrained on the front connecting rod, and the other end of the spring is restrained on the base.

19. The lumbar synchronization linkage of claim 18, wherein: the two ends of the spring are respectively sleeved with a first guide sleeve and a second guide sleeve, the first guide sleeve is hinged with a first supporting rod penetrating through the left side and the right side of the base, and the second guide sleeve is hinged with a second supporting rod penetrating through the left side and the right side of the front connecting rod.

20. The lumbar synchronization linkage of claim 14, wherein: when the lumbar support slides along one of the seat frame or the base, the displacement of the lumbar support relative to the base in the horizontal direction is larger than the displacement of the seat frame relative to the base.

21. The lumbar synchronization linkage of claim 14, wherein: the sliding guide mechanism comprises a connecting rod group which can extend or contract along the horizontal direction, and an upper sliding groove and a lower sliding groove which guide the connecting rod group; the connecting rod group is arranged between the upper sliding groove and the lower sliding groove and comprises a plurality of connecting rods which are sequentially hinged; the upper sliding groove is a linear groove and is arranged on the seat frame along the length direction of the seat frame, and the lower sliding groove is a linear groove and is arranged on the base along the length direction of the base; the connecting rod group is hinged with the base, the hinged point of the connecting rod group and the base does not move, and the connecting rod group is also hinged with the waist support to drive the waist support to slide along one of the seat frame or the base.

22. The lumbar synchronization linkage of claim 21, wherein: the connecting rod group is provided with a head part and a tail part, the head part of the connecting rod group is hinged with the waist support through a driving shaft, and the tail part of the connecting rod group is hinged with the base through a limiting shaft; and two adjacent connecting rods are hinged through a hinge shaft; the driving shaft and the hinge shaft are respectively and correspondingly inserted into the upper sliding groove or the lower sliding groove according to the positions of the driving shaft and the hinge shaft.

23. The lumbar synchronization linkage of claim 22, wherein: the waist support comprises a vertical support and a transverse support, the lateral part of the transverse support is provided with a linear guide groove along the length direction of the transverse support, the transverse support is inserted into the seat frame, and a hinge shaft positioned in the upper sliding groove is simultaneously inserted into the guide groove.

24. A seating tool, characterized in that: the seat is a sofa or a chair, and further comprises the waist synchronous linkage device as claimed in any one of claims 1 to 23, wherein the waist synchronous linkage device is arranged on the sofa or the chair.

Technical Field

The invention relates to the technical field of seats, in particular to a seat waist synchronous linkage device for a seat and a seat.

Background

When a person sits down, the waist of the person sitting backwards is generally required to be close to the backrest, and the waist of the person sitting forwards is not close to the seat, so that the waist cannot be supported; generally, people support the waist by putting a back cushion in front of the seat back, which is not convenient enough and troublesome to carry, although it can play a certain role.

French invention patent FR2045120 discloses a seat and backrest linkage system, which uses the lever principle, as shown in fig. 1-4, wherein the rod 6 is a power arm, the rod 4 is a resistance arm, a person sits down and presses the seat board 7, the rod 6 moves downward under pressure, the rod 4 moves downward obliquely around the fulcrum 5, and the backrest 3 pushes downward obliquely with the rod 4, thereby supporting the waist.

Furthermore, german invention patent DE10055951 discloses a seat back, which provides three embodiments, the first two principles being the combination of elastic stress and lever structure: the first method comprises the following steps: after a person sits down, the seat board surface 1 is pressed, the elastic system 5 applies force to the lever 5 after being compressed by pressure, the lever 7 rotates around the rotating shaft 6 after the lever 5 moves downwards, and the waist support 3 pushes forwards to prop against the waist; and the second method comprises the following steps: similarly to the first one, in particular, after the lever is pressed by the springs 10, 12, the lever 7 is caused to rotate around the rotating shaft 6, so that the waist support 3 is pushed forward; and the third is that: the principle is that the elastic system, the pressure rod and the tension roller are interlocked, after a person sits down and goes to the back, the seat 1 moves downwards under the action of gravity, the pressure rod 18 is driven to move downwards, meanwhile, after the belt 16 is dragged by the pressure rod 18, the tension roller 17 drives the support rod 14 to move forwards around the point 15, and then the lumbar support 3 moves forwards.

Although both of the above two patents can drive the backrest to move forward, the backrest moving forward moves obliquely downward. Although the slant back can play certain supporting role to people's waist, because the oblique downstream of back, for the support position of human backbone, can the step-down, lead to people's back to experience comfortable inadequately, in addition, in the back slant downstream, the holding surface angle of back has also changed, lead to the back with the position of human back waist, the angle corresponds not last, thereby the laminating degree of back and waist is not high, and is relatively poor to the support effect of health.

Chinese invention patent CN100556339 discloses a chair, which drives the backrest to move forward by compressing the hydraulic cylinder, although the backrest in the patent is close to horizontal movement, the structure is complex and is not easy to implement; in addition, when the weight is small or the pressure on the air cylinder is small, the backrest is difficult to move forwards, and the effect is unstable; and the hydraulic pressure in the hydraulic cylinder generally adopts oil, and fire behavior is relatively poor, has the potential safety hazard.

Disclosure of Invention

The invention overcomes the defects in the prior art and provides a seat waist synchronous linkage device for a seat, which not only solves the problem that the waist rest of the seat can not support the waist, but also can not incline downwards when the waist rest of the seat waist device moves forwards, and can stop moving forwards after the waist rest is supported to the waist horizontally forwards; in addition, the device adopts the principle of linkage of the connecting rods, and can achieve the effect of supporting the waist no matter the weight of a user; moreover, the device adopts the accessory comparatively simple, and the cost is lower, is fit for extensive, batch production.

Furthermore, the invention also provides a seat waist linkage device for realizing automatic rebound, the device realizes the automatic rebound of the seat by a simple spring principle, and the design of the spring ensures that the waist rest moves more smoothly in the using process of the seat waist device, so that the support of the seat is more comfortable, the seat waist linkage structure is simplified, and the cost is saved in the actual production.

The technical scheme of the invention is realized as follows:

a seat waist synchronous linkage device for a seat, comprising:

the base is used for supporting the whole device;

the seat frame is used for configuring a seat cushion and is arranged above the base;

the two ends of the front connecting rod are respectively hinged with the front end of the seat frame and the front end of the base, and the two ends of the rear connecting rod are respectively hinged with the rear end of the seat frame and the rear end of the base; the front and rear connecting rods, the base and the seat frame form a four-bar linkage mechanism, and the seat frame can move relative to the base under the supporting and guiding action of the front and rear connecting rods and can perform state conversion between an idle position and a sitting position; in the no-load position, the seat frame is upward far away from the base, and a larger elevation angle is formed between the front connecting rod and the base and between the rear connecting rod and the base; in the sitting position, the seat frame is downward close to the base, and a smaller elevation angle is formed between the front connecting rod and the base and between the rear connecting rod and the base;

the waist support is used for configuring a waist rest and is connected with the seat frame or the base in a sliding manner, and the waist support has an initial position and a waist supporting position;

and the sliding guide mechanism responds to the movement of the seat frame and drives the waist support to slide along one of the seat frame or the base while correspondingly enabling the waist support to generate relative displacement with the other of the seat frame or the base.

Preferably, when the seat frame is shifted from the idling position to the sitting position, the seat frame is moved in the horizontal direction while being lowered with respect to the base.

Preferably, when the lumbar support slides along one of the seat frame or the base, a displacement of the lumbar support relative to the base in the horizontal direction is larger than a displacement of the seat frame relative to the base. The waist support moves forwards to prop against the waist, thereby achieving the purpose of supporting the waist.

Preferably, the sliding guide mechanism comprises a linkage capable of extending or contracting along the horizontal direction and an upper sliding groove and a lower sliding groove for guiding the linkage; the connecting rod group is arranged between the upper sliding groove and the lower sliding groove and comprises a plurality of connecting rods which are sequentially hinged; the upper sliding groove is a linear groove and is arranged on the seat frame along the length direction of the seat frame, and the lower sliding groove is a linear groove and is arranged on the base along the length direction of the base; the connecting rod group is hinged with the base, the hinged point of the connecting rod group and the base does not move, and the connecting rod group is also hinged with the waist support to drive the waist support to slide along one of the seat frame or the base. A certain node of the connecting rod group is hinged with the base to play a limiting role, the connecting rod group extends and contracts towards the same side or two sides of the node by taking the node as a boundary, and the connecting rod group plays a role in amplifying the stroke of the waist support, so that the displacement of the waist support relative to the base is larger than that of the seat frame relative to the base, and the human waist can be rapidly supported by forwards moving when a human body sits on the seat frame.

Preferably, the connecting rod group is provided with a head part and a tail part, the head part of the connecting rod group is hinged with the waist support through a driving shaft, and the tail part of the connecting rod group is hinged with the base through a limiting shaft; and two adjacent connecting rods are hinged through a hinge shaft; the driving shaft and the hinge shaft are respectively and correspondingly inserted into the upper sliding groove or the lower sliding groove according to the positions of the driving shaft and the hinge shaft. The drive shaft drives the waist support and moves forward, and the spacing axle sets for an effective distance for the removal of waist support, prevents that the waist support from leaning on too far ahead, influencing human result of use.

Preferably, the left side and the right side of the seat frame are provided with wing plates extending downwards, and the upper sliding grooves are arranged on the wing plates along the length direction of the seat frame; the left and right sides of base is equipped with the curb plate that extends up, lower sliding tray set up on the curb plate along base length direction.

Preferably, the waist support comprises a vertical support and a horizontal support, the lateral part of the horizontal support is provided with a linear guide groove along the length direction of the horizontal support, the horizontal support is inserted into the seat frame, and the hinge shaft in the upper sliding groove is simultaneously inserted into the guide groove. Therefore, the hinged shaft simultaneously plays a role in supporting the transverse support, so that the transverse support can move back and forth along the seat frame.

Preferably, the hinge shaft is a long shaft, and penetrates through the left and right sides of the seat frame or the base. The support performance is better, the connecting rod groups on the two sides can move synchronously, and the moving track is more stable.

Preferably, the driving shaft is a long shaft, and penetrates through the left and right sides of the seat frame or the base.

Preferably, the linkage comprises at least 3 connecting rods, and two adjacent connecting rods form a V shape.

Preferably, the linkage comprises 4-6 connecting rods. The number of the connecting rods is set according to different requirements, so that a more comfortable lumbar support effect is achieved.

Preferably, the waist support comprises a vertical support and a horizontal support, and the horizontal support is inserted into the seat frame and is in sliding fit with the seat frame through a sliding rail. The sliding mode enables the waist support to move forward more smoothly and the moving speed is higher.

Preferably, the seat frame is arranged parallel to the base and is always parallel to the base when the seat frame is switched between the unloaded position and the sitting position. When the device is used for supporting the waist of a human body, the supporting position of the waist support relative to the spine of the human body is unchanged, so that the back experience of the human body is more comfortable.

A seat waist synchronous linkage device for a seat, comprising:

the base is used for supporting the whole device;

the seat frame is used for configuring a seat cushion and is arranged above the base;

the two ends of the front connecting rod are respectively hinged with the front end of the seat frame and the front end of the base, and the two ends of the rear connecting rod are respectively hinged with the rear end of the seat frame and the rear end of the base; the front and rear connecting rods, the base and the seat frame form a four-bar linkage mechanism, and the seat frame can move relative to the base under the supporting and guiding action of the front and rear connecting rods and can perform state conversion between an idle position and a sitting position; in the no-load position, the seat frame is upward far away from the base, and a larger elevation angle is formed between the front connecting rod and the base and between the rear connecting rod and the base; in the sitting position, the seat frame is downward close to the base, and a smaller elevation angle is formed between the front connecting rod and the base and between the rear connecting rod and the base;

the waist support is used for configuring a waist rest and is connected with the seat frame or the base in a sliding manner, and the waist support has an initial position and a waist supporting position;

the sliding guide mechanism responds to the movement of the seat frame and drives the waist support to slide along one of the seat frame or the base while correspondingly enabling the waist support to generate relative displacement with the other of the seat frame or the base;

and the elastic resetting device is used for assisting the seat frame to move from the sitting position to the no-load position and synchronously assisting the waist support to move from the waist supporting position to the initial position. The setting of elasticity resetting means makes this seat have automatic re-setting's function, and at the human in-process of sitting up, the comparatively releiving that the seat frame moved down for human experience feels better.

Preferably, the elastic return device is a spring.

Preferably, the spring is a compression spring, one end of the spring is constrained on the seat frame, and the other end of the spring is constrained on the base.

Preferably, the two ends of the spring are respectively sleeved with a first guide sleeve and a second guide sleeve, the first guide sleeve is hinged with a first support rod penetrating through the left side and the right side of the base, and the second guide sleeve is hinged with a second support rod penetrating through the left side and the right side of the seat frame.

Preferably, the spring is a compression spring, one end of the spring is constrained on the front connecting rod, and the other end of the spring is constrained on the base. Therefore, under the condition of not changing the action effect, the length of the spring is shorter than that of the spring which is restrained on the seat frame by one end, and the cost is saved.

Preferably, the two ends of the spring are respectively sleeved with a first guide sleeve and a second guide sleeve, the first guide sleeve is hinged with a first support rod penetrating through the left side and the right side of the base, and the second guide sleeve is hinged with a second support rod penetrating through the left side and the right side of the front connecting rod.

Preferably, when the lumbar support slides along one of the seat frame or the base, a displacement of the lumbar support relative to the base in the horizontal direction is larger than a displacement of the seat frame relative to the base. The waist support moves forwards to prop against the waist, thereby achieving the purpose of supporting the waist.

Preferably, the sliding guide mechanism comprises a linkage capable of extending or contracting along the horizontal direction and an upper sliding groove and a lower sliding groove for guiding the linkage; the connecting rod group is arranged between the upper sliding groove and the lower sliding groove and comprises a plurality of connecting rods which are sequentially hinged; the upper sliding groove is a linear groove and is arranged on the seat frame along the length direction of the seat frame, and the lower sliding groove is a linear groove and is arranged on the base along the length direction of the base; the connecting rod group is hinged with the base, the hinged point of the connecting rod group and the base does not move, and the connecting rod group is also hinged with the waist support to drive the waist support to slide along one of the seat frame or the base. A certain node of the connecting rod group is hinged with the base to play a limiting role, the connecting rod group extends and contracts towards the same side or two sides of the node by taking the node as a boundary, and the connecting rod group plays a role in amplifying the stroke of the waist support, so that the displacement of the waist support relative to the base is larger than that of the seat frame relative to the base, and the human waist can be rapidly supported by forwards moving when a human body sits on the seat frame.

Preferably, the connecting rod group is provided with a head part and a tail part, the head part of the connecting rod group is hinged with the waist support through a driving shaft, and the tail part of the connecting rod group is hinged with the base through a limiting shaft; and two adjacent connecting rods are hinged through a hinge shaft; the driving shaft and the hinge shaft are respectively and correspondingly inserted into the upper sliding groove or the lower sliding groove according to the positions of the driving shaft and the hinge shaft. The drive shaft drives the waist support and moves forward, and the spacing axle sets for an effective distance for the removal of waist support, prevents that the waist support from leaning on too far ahead, influencing human result of use.

Preferably, the waist support comprises a vertical support and a horizontal support, the lateral part of the horizontal support is provided with a linear guide groove along the length direction of the horizontal support, the horizontal support is inserted into the seat frame, and the hinge shaft in the upper sliding groove is simultaneously inserted into the guide groove. The design of the guide groove ensures that the waist support can not deviate from the horizontal position to move, thereby giving better and more comfortable experience to the human body.

A seat is a sofa or a chair and also comprises the seat waist synchronous linkage device, and the seat waist synchronous linkage device is arranged on the sofa or the chair.

The design starting point, the idea and the beneficial effects of the invention adopting the technical scheme are as follows:

the seat frame and the base form a four-bar linkage through the front connecting rod and the rear connecting rod, the waist support is connected with one of the seat frame or the base in a sliding mode, the seat frame moves forwards or backwards while moving downwards when being stressed, the forward or backward movement of the seat frame depends on the arrangement direction of the front connecting rod and the rear connecting rod, the waist support is dragged to slide forwards through the sliding guide mechanism while moving, the stroke of the waist support relative to the base in the horizontal direction is larger than that of the seat frame relative to the base, namely the stroke of the waist support is larger, so that a human body can be quickly jacked to the waist of the human body when the human body sits on the seat, and the purpose of supporting the waist is achieved.

Furthermore, the sliding guide mechanism adopts a telescopic connecting rod group, the connecting rod group transmits force between the seat frame and the waist support, the response is quick, the function of amplifying the stroke of the waist support is achieved, and the stroke of the waist support depends on the number and the length of the connecting rods forming the connecting rod group.

The waist support moves close to horizontal movement when moving, moves forwards and horizontally relative to the seat frame, does not change the angle of the waist support of the human body, does not turn in a slant downward direction, and therefore, the support has better fitness; especially, when the waist support slides back and forth along the base, the height and the angle of the waist support are not changed, and the waist support only moves in the horizontal direction, so that the human body feels more comfortable when sitting for a long time.

Furthermore, the seat waist synchronous linkage device is simple in structure, can be used for various seats such as office chairs, sofas, leisure chairs and the like, and is beneficial to modular production, popularization and application.

Drawings

Fig. 1 is a schematic perspective view of the invention applied to the empty sofa in example 1;

FIG. 2 is a perspective view of the sofa of embodiment 1 in an intermediate state of the invention when the sofa is converted between unloaded and seated states;

FIG. 3 is a schematic perspective view of the present invention applied to a sofa in the embodiment 1;

fig. 4 is a side view of the invention according to example 1, applied when the sofa is empty;

fig. 5 is a side view of the invention in example 1 applied to an intermediate position of the sofa in the unloaded and seated position transition;

fig. 6 is a side view of the present invention applied to a sofa seat in example 1;

FIG. 7 is a front view showing the internal structure of the present invention in an unloaded state in accordance with embodiment 1;

FIG. 8 is a front view showing an intermediate state of the present invention in the idling and sitting posture in the embodiment 1;

FIG. 9 is a front view showing the internal structure in the sitting state of the invention in embodiment 1;

FIG. 10 is a side view of the internal structure of the present invention in an unloaded state in accordance with embodiment 1;

FIG. 11 is a side view of the invention in an intermediate state during an empty and seated transition in accordance with embodiment 1;

fig. 12 is a side view of the internal structure in the sitting state of the invention in embodiment 1;

FIG. 13 is a first perspective view showing the internal structure of the present invention in an unloaded state according to embodiment 1;

FIG. 14 is a first perspective view of the present invention in an intermediate state during the empty and sitting transition in accordance with embodiment 1;

FIG. 15 is a first perspective view showing the internal structure of the present invention in a sitting position according to embodiment 1;

FIG. 16 is a second perspective view showing the internal structure of the present invention in an unloaded state in accordance with embodiment 1;

FIG. 17 is a second perspective view of the present invention in an intermediate state during the empty and sitting transition of embodiment 1;

FIG. 18 is a second perspective view showing the internal structure of the present invention in a sitting position in accordance with embodiment 1;

fig. 19 is a schematic perspective view of the internal structure of the seat frame and the base of the present invention in the unloaded state according to embodiment 1;

FIG. 20 is a perspective view of the present invention in embodiment 1, showing an intermediate state between unloaded and seated states, with the seat frame and the base disassembled;

fig. 21 is a schematic perspective view of the internal structure of the seat frame and the base of the present invention in the sitting state according to embodiment 1;

fig. 22 is a schematic perspective view illustrating an internal structure of the seat frame, the lumbar support, the sliding guide mechanism, the elastic return device, and the base in an unloaded state according to embodiment 1 of the present invention;

FIG. 23 is a side view showing the internal structure of the present invention in an unloaded state in accordance with embodiment 2;

FIG. 24 is a first perspective view showing the internal structure of the present invention in an unloaded state according to embodiment 2;

FIG. 25 is the second perspective view showing the internal structure of the present invention in the unloaded state in accordance with embodiment 2;

fig. 26 is a schematic perspective view illustrating an internal structure of the seat frame and the base in an unloaded state according to embodiment 2 of the present invention;

fig. 27 is a third perspective view showing the internal structure of the present invention in an unloaded state in embodiment 2;

fig. 28 is a first perspective view of the empty sofa of the present invention according to embodiment 1;

fig. 29 is a schematic perspective view of the empty sofa of the present invention according to embodiment 1.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the scope of the present invention is not limited by the specific embodiments disclosed below.

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

The specific embodiment of the invention is as follows: