CN217524357U - Elastic supporting structure of seat - Google Patents

Abstract

The utility model discloses an elastic supporting structure of a chair, which comprises a base, a chair back main body and a chair seat main body; the lower end of the chair back main body is rotatably connected to the rear end of the base, connecting arms which are in mirror image and extend towards two sides are further arranged at the bottom of the chair back main body, and the connecting arms are configured to be connected to the rear end of the chair seat main body; the front end of the base is provided with a spring steel plate which extends obliquely upwards, and the spring steel plate is configured to be connected with and support the front end of the seat main body; the upper end of the spring steel plate is in running fit with the chair seat main body; when the chair back main body is subjected to backward acting force to tilt backwards, the chair seat main body moves backwards along with the chair back main body; the spring steel plate is bent backwards relative to the base and provides restoring elasticity; when the spring steel plate is bent, the upper end of the spring steel plate can longitudinally sink; so as to completely or partially offset the lifting trend of the front end of the seat main body; the front end of the chair seat main body can not be obviously raised, and the thigh of a user is prevented from being extruded.

Description

Elastic supporting structure of seat

Technical Field

The utility model relates to a thing to sit on field, in particular to elastic support structure of seat.

Background

The office chair is an indispensable product in office furniture, and is popular with consumers due to good practicability. The lifting of the seat cushion and the inclination angle adjustment of the backrest of the existing office chair are all completed by the chassis. Because the human body can change various postures in the sitting state, the chair back and the chair seat can move back and forth along with the back and the seat of the human body, so that the human body feels more comfortable; therefore, the prior chair back cannot be met, some manufacturers respectively develop a chair with self-adaptive functions, but the functions are all dependent on the chassis, so that the structure of the chassis is complex, the complex structure and the adjustment difficulty of the chassis not only increase the operation difficulty of a user, but also have high cost.

The utility model with the patent number of CN200720094311.4 discloses a chair structure, which belongs to furniture; it comprises a support leg; a base supporting the legs; a back support mounted on the back; a seat support mounted on the seat; a first swing central shaft which inclines backwards and is connected with the chair back support body is arranged on the base; a second swing central shaft which is positioned at the same height or above the front of the first swing central shaft and is connected with the seat support body in a swinging way; a third rocking center shaft which is located between the first and second rocking center shafts and is connected to the upper side of the first and second rocking center shafts, wherein the back support body is vertically rocking-connected to the seat support body, and is linked to the back support body to be tilted backward and lifted up, and the third rocking center shaft is connected to the second rocking center shaft. Has the advantages that: simple structure, convenient use, low cost, more comfortable sitting of the chair and strong practicability.

Most of the existing chairs with the tilting function realize the tilting function of the chair through the chassis with the structure or the structure similar to the structure, so that the chair seat and the chair back can be adaptive to the corresponding movement of the dynamic sitting posture of a user. However, the moving structures are all arranged on the chassis, and the chassis is usually made of metal and correspondingly provided with corresponding structures, so that the overall weight of the chair is heavier and the cost is higher. Some chairs also adopt a four-bar linkage structure between the chair seat and the chassis, so that the chair seat can move relative to the chassis; however, the connecting rod often causes the seat to move and the front end to lift upwards, so that the front end of the seat presses the thighs of the user, and the feet of the seat are pressed by the seat in a backward leaning state. Moreover, in order to improve the use comfort, a spring structure is necessarily required to be arranged in the chassis, so that the chair seat and the chair back have good damping feeling and can automatically reset when moving, and the structure is further complicated. The design of the current seat increasingly pursues a simple and beautiful aesthetic style; therefore, it is necessary to develop a lightweight chair that can achieve the same effect, so as to reduce the overall weight of the chair and reduce the cost.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art and provide an elastic supporting structure of a chair which is simple and beautiful, and through arranging a spring steel plate between the front end of a base and the front end of a chair seat main body, the spring steel plate can respond to the movement of the chair seat main body to generate elastic deformation and provide reset elasticity, so that the chair seat main body is elastically supported all the time, and the structure is very simple; when the spring steel plate is bent, the upper end of the spring steel plate can longitudinally sink, and then the upper end of the spring steel plate can be completely or partially offset with the lifting trend of the front end of the chair seat main body; make under the state of heeling back, the front end height of seat support main part can not obviously be raised to can not extrude user's thigh, improve use comfort.

The technical scheme of the utility model is realized like this:

an elastic supporting structure of a chair comprises a base, a chair back main body and a chair seat main body; the lower end of the chair back main body is rotatably connected to the rear end of the base, connecting arms which are arranged in a manner of mirroring and extend towards two sides are further arranged at the bottom of the chair back main body, and the connecting arms are configured to be connected to the rear end of the chair seat main body; the front end of the seat body is positioned above the front part of the base, the front end of the base is provided with a spring steel plate extending upwards in an inclined way, and the spring steel plate is configured to be connected with and support the front end of the seat body; the upper end of the spring steel plate is in running fit with the chair seat main body; when the chair back main body is subjected to backward acting force to tilt backwards, the chair seat main body moves backwards along with the chair back main body; the upper end of the spring steel plate is subjected to backward traction force, so that the spring steel plate is bent backwards relative to the base and provides reset elastic force.

Preferably, the chair has an initial state and a reclined state, and in the reclined state, the front end of the seat is raised by 0-10mm relative to the initial state. The deformation distance of the spring steel plate is far less than that of other materials such as plastics, so that when the chair back main body tilts backwards, the front end of the chair seat main body is not obviously lifted, and the lifting is controlled within a reasonable range.

Preferably, when the seat main body is loaded by the weight of a person and in a backward leaning state, the front end of the seat is lifted by 0-5mm relative to the initial state. Similarly, the deformation distance of the spring steel plate is far shorter than that of other materials such as plastics, so that when the chair back leans backwards, the front end of the chair seat is not obviously lifted, and the feeling of pressing thighs cannot be generated; if the force arm is made of plastic, the force arm is easy to break when moving too short, but if the force arm is lengthened, the front end of the chair seat is relatively higher in tilting when deforming, and the leg-pressing feeling is generated.

Preferably, the lower end of the spring steel plate is in plug-in fit with the base; the bottom of the spring steel plate is provided with a first plug-in section which horizontally extends backwards, and the front end surface of the base is correspondingly provided with a slot; the first plugging section is plugged in the slot. The first inserting section is inserted into the base, so that the connection strength between the spring steel plate and the base is high.

Preferably, an embedded groove hollowed out along the front-rear direction is arranged in the middle of the first inserting section, and an opening of the embedded groove is positioned at the front end of the first inserting section; a rib plate is correspondingly arranged in the middle of the slot; when the first inserting section is inserted into the inserting groove, the rib plate is embedded into the embedding groove. The rib plates in the slots of the base are embedded into the slots of the first inserting section, so that the connection strength is further improved, and the spring steel plate can be bent without breaking.

Preferably, after the first plug section is inserted into the slot, the first inserting section is fixedly connected with the base through screws.

Preferably, the upper end of the spring steel plate is connected with a rotating shaft seat, and two sides of the rotating shaft seat are respectively provided with a rotating shaft; two spaced rotating shaft sleeves are correspondingly arranged at the front end of the seat body main body, and connecting circular grooves which can be in running fit with the rotating shaft are correspondingly arranged on the rotating shaft sleeves. The upper end of the spring steel plate can rotate with the connecting part of the seat main body, and then the rotating shaft seat can rotate in a self-adaptive manner when the seat main body moves backwards and pulls the spring steel plate to be stressed and bent, so that the stress direction is changed; the fracture of the joint caused by over-concentrated stress is avoided; ingenious design and improved structural durability.

Preferably, the rotating shaft seat is detachably connected with the rotating shaft sleeve, shaft milling planes are respectively arranged at the front end and the rear end of a single rotating shaft, a limiting notch with a backward opening is further arranged on the rotating shaft sleeve and communicated with the connecting circular groove, the limiting notch is configured to be matched with the space between the two shaft milling planes of the rotating shaft in the opening size, and the opening size of the limiting notch is smaller than the diameter of the rotating shaft. Therefore, during installation, the angle of the seat main body needs to be adjusted firstly, so that the rotating shaft can pass through the avoiding notch and is in rotating fit in the connecting circular groove, and then the seat main body is rotated to the horizontal position; the limiting notch can limit the rotating shaft to be separated from the connecting circular groove; design benefit for can carry out the dismouting, simple to operate fast between seat support main part and the rotating shaft seat.

Preferably, the upper end of the spring steel plate is provided with a second inserting portion, the second inserting portion is in inserting fit with the rotating shaft seat, and the second inserting portion and the rotating shaft seat are connected through screws. The connection mode of the second inserting part and the rotary shaft seat is the same as that of the first inserting part and the base, so that the connection strength of the spring steel plate and the rotary shaft seat is high.

Preferably, the seat main body includes a front surrounding rod at a front end, and an upper end of the spring steel plate is connected to a middle position of the front surrounding rod. Through the spring steel plate, a closed loop is formed between the front end of the seat body and the front end of the base, and the structure is attractive.

Preferably, the seat body is of a frame structure and comprises seat side rods respectively positioned at two sides; the lower end of the chair back main body is provided with a rotary connecting part which is in rotary fit with the base; the mirror image of the connecting arm is arranged on two sides of the connecting part, and the connecting arm is hinged with the rear end of the seat side rod. Then when the chair back main body tilts backwards, the connecting arm drives the chair seat main body to correspondingly move backwards, and the height of the rear end of the chair seat main body is reduced; the hinged part of the seat side lever and the connecting arm correspondingly and adaptively rotates, so that the stress fracture of the connecting part of the seat side lever and the connecting arm is avoided; and the rear end of the seat main body descends, so that the user can be prevented from sliding forwards when the user leans backwards.

Preferably, a flexible cover is provided outside the spring steel plate, and the flexible cover covers a portion of the spring steel plate exposed between the seat main body and the base. Therefore, the existence of the spring steel plate can be hidden, and the structure is simpler and more attractive.

Adopted above-mentioned technical scheme the utility model discloses a design departure point, theory and beneficial effect are:

firstly, the elastic supporting structure of the chair of the utility model is provided with the spring steel plate at the front end of the base and the front end of the chair seat main body; the deformation distance of the spring steel plate is far less than that of other materials such as plastics, so that when the chair back leans backwards, the front end of the chair seat is not obviously lifted, and the lifting is controlled within a reasonable range. When the chair leans backwards, the chair back main body rotates backwards and drives the chair seat main body to move backwards; the spring steel plate is correspondingly stressed and bent, so that the upper end of the spring steel plate moves backwards and upwards, and the front end of the seat body has a lifting trend; however, in the bending process of the spring steel plate, the spring steel plate is changed into a bent shape from a straight plate shape, so that the upper end of the spring steel plate can sink longitudinally; and under the state of facing backward, the gravity that the user's shank applyed at seat support main part front end can increase to can further extrude spring steel plate downwards, make spring steel plate's upper end have further decline trend. Therefore, the ascending trend of the upper end of the spring steel plate is partially or completely offset with the descending trend of the upper end of the spring steel plate, the height of the front end of the seat body main body can not be obviously raised in a backward leaning state, the thigh of a user can not be upwards extruded, and the use is comfortable.

Moreover, the spring steel plate is connected between the front end of the base and the front end of the seat main body, so that a closed loop is formed between the front end of the seat main body and the front end of the base, and the structure is simple and attractive. The lower end of the spring steel plate is connected with the base in an inserting mode and fixed through screws, so that the connection strength between the spring steel plate and the base is high, and bearing stress is better. The upper end of the spring steel plate is provided with a rotating shaft seat and is rotatably connected to the front end of the seat main body; so that the connecting part of the upper end of the spring steel plate and the chair seat main body can rotate, then when the seat main body moves backwards and pulls the spring steel plate to be stressed and bent, the rotating shaft seat can rotate in a self-adaptive manner, so that the stress direction is changed; the fracture of the joint caused by over-concentrated stress is avoided; ingenious design and improved structural durability.

Drawings

Fig. 1 is a side view of a seat in an embodiment of the present invention;

fig. 2 is a schematic perspective view of the front end of the seat according to the embodiment of the present invention;

fig. 3 is a schematic perspective view of the rear end of the seat according to the embodiment of the present invention;

fig. 4 is a schematic perspective view of the base and the rotation connection portion of the present invention;

FIG. 5 is an exploded view of the connection between the spring steel plate and the base and seat body according to an embodiment of the present invention;

fig. 6 is a schematic perspective view illustrating a connection between a spring steel plate and a base according to an embodiment of the present invention;

FIG. 7 is a schematic perspective view of the embodiment of the present invention, wherein the spring steel plate is hinged to the seat main body;

fig. 8 is a schematic structural view illustrating a reclining motion of the seat according to an embodiment of the present invention;

fig. 9 is a schematic structural view illustrating another state of the reclining seat according to the embodiment of the present invention.

The figures are numbered: a base 1; a seat back main body 2; the rotation connecting portion 2a; a seat main body 3; a seat side lever 3a; a connecting arm 4; a spring steel plate 5; a first plug section 5a; a second plug section 5b; a connecting shaft 6; the mounting base 7 is rotated; a slot 8; a caulking groove 9; a rib plate 10; a front rail 11; a rotary shaft seat 12; a rotating shaft 13; the shaft milling plane 13a; a rotary sleeve 14; a connecting circular groove 15; a limit notch 16; a flexible cover 17.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. 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 therefore 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 unless explicitly defined otherwise. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The present embodiment relates to reference positions of respective portions, and uses a position of a seat back main body as a rear end as a reference.

The specific implementation manner of the utility model is as follows:

as shown in fig. 1-9, the present invention provides an elastic supporting structure of a chair, which comprises a base 1, a chair back main body 2 rotatably connected to the rear end of the base 1, and a chair seat main body 3 connected to the upper side of the base 1; the bottom of the chair back main body 2 is also provided with connecting arms 4 which extend towards two sides in a mirror image manner, and the connecting arms 4 are configured to be connected to the rear end of the chair seat main body 3; so that the chair seat main body 3 can tilt and rotate along with the chair back main body 2; the front end of the seat main body 3 is positioned at the front upper part of the base 1, the front end of the base 1 is provided with a spring steel plate 5 which extends obliquely upwards, and the spring steel plate 5 is configured to be connected with and support the front end of the seat main body 3; the upper end of the spring steel plate 5 is in running fit with the seat body 3; then, when the chair back main body 2 is subjected to backward acting force to tilt backwards, the chair seat main body 3 moves backwards along with the chair back main body 2; the upper end of the spring steel plate 5 is subjected to backward traction force, so that the spring steel plate 5 is bent backwards relative to the base and provides reset elasticity; and the upper end of the spring steel plate 5 will sink a distance in the longitudinal direction during the bending of the spring steel plate 5. In addition, the front end height of the seat main body 3 is raised when the spring steel plate 5 is bent backwards; then the distance of the front end of the seat main body 3 rising and the distance of the upper end of the spring steel plate 5 sinking due to bending are offset; so that the front end of the seat main body 3 is not raised significantly in the reclining state, and the thighs of the user are not squeezed. In addition, the deformation distance of the spring steel plate 5 is far less than that of other materials such as plastics, so that when the chair back main body 2 tilts backwards, the front end of the chair seat main body 1 is not obviously lifted and is controlled within a reasonable range; the spring steel plate 5 is adopted to support the chair seat main body 3, the structural strength is high, and the chair seat main body 3 can be elastically supported; need not to set up spring assembly in addition, it is comfortable to use for the structure is succinct pleasing to the eye.

As shown in fig. 1-4, a lower end of the chair back main body 2 is provided with a rotary connecting part 2a, and two sides of the rear end of the base 1 are respectively provided with connecting shafts 6 extending outwards; two rotary mounting seats 7 which are spaced left and right are correspondingly arranged at the front end of the rotary connecting part 2a; the connecting shaft 6 on each side is rotatably connected to the rotating mounting seat 7 on the corresponding side; so that the rotation connecting portion 2a can rotate back and forth relative to the base 1 about the connecting shaft 6; so that the seat back main body 2 can tilt back and forth with respect to the base 1. The connecting arms 4 are arranged on two sides of the rotating connecting part 2a in a mirror image manner, and the connecting arms 4 extend upwards and obliquely from the rotating connecting part 2a; seat support main part 3 is frame rack type structure, and seat support main part 3 is including the seat side pole 3a that is located both sides respectively, the rear end of seat side pole 3a is connected on linking arm 4, just seat side pole 3a and linking arm 4 articulated cooperation. Then, when the chair back main body 2 tilts backwards, the connecting arm 4 drives the chair seat main body 3 to correspondingly move backwards, and the height of the rear end of the chair seat main body 3 is reduced; the hinged part of the seat side rod 3a and the connecting arm 4 correspondingly and adaptively rotates, so that the stress fracture of the connecting part of the seat side rod and the connecting arm is avoided; and the rear end of the seat main body 3 descends, so that the user can be prevented from sliding forwards when the user leans backwards.

As shown in fig. 5 to 7, the lower end of the spring steel plate 5 is inserted into and matched with the base 1, specifically: a first plug-in section 5a extending horizontally and backwards is arranged at the lower end of the spring steel plate 5, a slot 8 is correspondingly arranged on the front end surface of the base 1, and the first plug-in section 5a can be just plugged in the slot 8; a hollow caulking groove 9 is arranged in the middle of the first inserting section 5a along the front-back direction, and an opening of the caulking groove 9 is positioned at the front end of the first inserting section 5a; a rib plate 10 is correspondingly arranged in the middle of the slot 8 of the base; the rib plate 10 will be embedded into the caulking groove 9 while the first plug section 5a is inserted into the slot 8. The connection between the first plug section 5a and the base 1 is tighter, and the connection strength is further increased. As shown in fig. 6, after the first inserting section 5a is completely inserted into the slot 8, the first inserting section 5a is fixedly connected to the base 1 through a screw, and the screw vertically penetrates through the base 1 and the first inserting section 5a from the upper end of the base 1, so that the two are connected stably.

From back to front, the spring steel plate 5 extends from the front end of the base 1 to the front upper part and is hinged at the middle position of the front end of the seat main body 3; the front end of the seat body 3 forms a closed loop with the base 1 through the spring steel plate 5, and the structure is attractive. Further comprising: the upper end of the spring steel plate 5 is connected with a rotating shaft seat 12, the upper end of the spring steel plate 5 is provided with a second inserting section 5b, the second inserting section 5b is inserted and matched with the rotating shaft seat 12 and is fixedly connected with the rotating shaft seat 12 through a screw, and the connecting mode of the second inserting section 5b and the rotating shaft seat 12 is the same as that of the first inserting section 5b and the base 1; so that the rotating shaft seat 12 is firmly connected with the spring steel plate 5. Two sides of the rotating shaft seat 12 are respectively provided with a rotating shaft 13; the seat body 3 comprises a front surrounding rod 11 positioned at the front end, two spaced rotating shaft sleeves 14 are arranged in the middle of the front surrounding rod 11, and a connecting circular groove 15 capable of being in rotating fit with the rotating shaft 13 is arranged on the inner side of each rotating shaft sleeve 14; and the rotating shaft sleeve 14 and the rotating shaft seat 12 are detachably connected, specifically: the front end and the rear end of each rotating shaft 13 are respectively provided with a shaft milling plane 13a, the rotating shaft sleeve 14 is also provided with a limiting notch 16 with a backward opening, the limiting notch 16 is communicated with the connecting circular groove 15, the limiting notch 16 is configured to have an opening size matched with the distance between the two shaft milling planes 13a of the rotating shaft 13, and the opening size of the limiting notch 16 is smaller than the diameter of the rotating shaft 13; therefore, during installation, the angle of the seat main body 3 needs to be adjusted firstly, so that the rotating shaft 13 can pass through the avoiding notch 16 and is in rotating fit in the connecting circular groove 15, and then the seat main body 3 is rotated to the horizontal position; the limit notch 16 can then limit the rotation shaft 13 from being separated from the connection circular groove 15. Ingenious design, convenient installation and fast assembly and disassembly between the seat body 3 and the rotary shaft seat 12.

As shown in fig. 1, 3 and 5, a flexible outer cover 17 is further arranged on the spring steel plate 5, and the flexible outer cover 17 is made of soft rubber; the flexible cover 17 covers the part of the spring steel plate 5 exposed between the base 1 and the rotary shaft seat 12; thereby being capable of hiding the existence of the spring steel plate 5 and leading the structure to be more simple and beautiful.

As shown in fig. 8 and 9, when the chair is tilted backward, the chair back main body 2 will rotate backward and drive the chair seat main body 3 to move backward; the corresponding atress of spring steel sheet 5 is crooked for the upper end of spring steel sheet 5 will be upwards movement backward, makes the front end of seat support main part 3 have the trend of lifting up, but spring steel sheet 5 deformation distance is far less than other materials such as plastics, makes back of the chair main part 2 when leaning back like this, and the front end of seat support main part 3 is raised unobviously, controls at reasonable within range. In addition, during the bending process of the spring steel plate 5, the front end of the spring steel plate 5 correspondingly has a vertical sinking tendency; so that the ascending trend of the upper end of the spring steel plate 5 and the descending trend thereof are partially or completely offset; as shown in fig. 8, when the two are completely offset (in the theoretical state), the height of the front end of the seat main body 3 and the initial height are kept substantially unchanged in the reclining state, so that the user will not press the thighs upward, and the use is comfortable. As shown in fig. 9, when the two parts are partially offset, the front end of the seat main body 3 in the reclining state is lifted a small distance, not more than 10mm, relative to the initial state, and the thigh of the user is not basically pressed, so that the comfort is not affected. Further, when the user is loaded with the weight on the seat and in the reclining state, the weight applied to the front end of the seat main body 3 by the legs of the user is increased, so as to further press the spring steel plate 5 downward, so that the upper end of the spring steel plate 5 has a further downward trend, and further to suppress the front end of the seat main body 3 from being lifted up in the reclining state; then, when the body weight is loaded and the seat is in the reclining state, the front end of the seat main body 3 is lifted by no more than 5mm in the state of fig. 9 relative to the initial state. Moreover, the spring steel plate 5 is arranged, so that the connection strength between the seat main body 3 and the base 1 can be ensured, the seat main body 3 can be always elastically supported, sufficient reset elasticity is provided, and the chair is more comfortable to use; and the spring steel plate 5 is connected between the base 1 and the front end of the seat main body 3, so that the structure is simple and attractive.

Claims (12)

1. An elastic support structure of a seat, characterized in that: comprises a base, a chair back main body and a chair seat main body; the lower end of the chair back main body is rotatably connected to the rear end of the base, connecting arms which are in mirror image and extend out towards two sides are further arranged at the bottom of the chair back main body, and the connecting arms are configured to be connected to the rear end of the chair seat main body; the front end of the seat body is positioned above the front part of the base, the front end of the base is provided with a spring steel plate extending upwards in an inclined way, and the spring steel plate is configured to be connected with and support the front end of the seat body; the upper end of the spring steel plate is in running fit with the chair seat main body; when the chair back main body is subjected to backward acting force to tilt backwards, the chair seat main body moves backwards along with the chair back main body; the upper end of the spring steel plate is subjected to backward traction force, so that the spring steel plate is bent backwards relative to the base and provides reset elastic force.

2. The resilient support structure of a seat according to claim 1, wherein: the chair has an initial state and a backward state, and when the chair is in the backward state, the front end of the chair seat is lifted by 0-10mm relative to the initial state.

3. The resilient support structure of a seat according to claim 1, wherein: when the chair seat main body is loaded by the weight of a person and in a backward leaning state, the front end of the chair seat is lifted by 0-5mm relative to the initial state.

4. The resilient support structure of a seat according to claim 1, wherein: the lower end of the spring steel plate is in inserting fit with the base; the bottom of the spring steel plate is provided with a first plug-in section which horizontally extends backwards, and the front end face of the base is correspondingly provided with a slot; the first plugging section is plugged in the slot.

5. The resilient support structure of a seat according to claim 4, wherein: the middle of the first inserting section is provided with an embedding groove which is hollowed along the front-back direction, and the opening of the embedding groove is positioned at the front end of the first inserting section; a rib plate is correspondingly arranged in the middle of the slot; when the first inserting section is inserted into the inserting groove, the rib plate is embedded into the embedding groove.

6. The resilient support structure of a seat according to claim 4, wherein: after the first inserting section is inserted into the slot, the first inserting section is fixedly connected with the base through screws.

7. The resilient support structure of a seat according to claim 1, wherein: the upper end of the spring steel plate is connected with a rotating shaft seat, and rotating shafts are respectively arranged on two sides of the rotating shaft seat; two spaced rotating shaft sleeves are correspondingly arranged at the front end of the seat body main body, and connecting circular grooves which can be matched with the rotating shaft in a rotating mode are correspondingly arranged on the rotating shaft sleeves.

8. The resilient support structure of a seat according to claim 7, wherein: the rotary shaft seat is detachably connected with the rotary shaft sleeve, the front end and the rear end of a single rotary shaft are respectively provided with a shaft milling plane, the rotary shaft sleeve is further provided with a limiting notch with an opening facing backwards, the limiting notch is communicated with the connecting circular groove, the limiting notch is configured to be matched with the space between the two shaft milling planes of the rotary shaft in the opening size, and the opening size of the limiting notch is smaller than the diameter of the rotary shaft.

9. The resilient support structure of a seat according to claim 7, wherein: and a second inserting part is arranged at the upper end of the spring steel plate, the second inserting part is in inserting fit with the rotating shaft seat and is connected with the rotating shaft seat through screws.

10. The resilient support structure of a seat according to claim 1, wherein: the seat main part comprises a front surrounding rod positioned at the front end, and the upper end of a spring steel plate is connected to the middle position of the front surrounding rod.

11. The resilient support structure of a seat according to claim 1, wherein: the chair seat main body is of a frame type structure and comprises seat side rods which are respectively positioned at two sides; the lower end of the chair back main body is provided with a rotary connecting part which is rotationally matched with the base; the connecting arms are arranged on two sides of the connecting part in a mirror image mode, and the connecting arms are hinged to the rear ends of the seat side rods.

12. The resilient support structure of a seat according to claim 1, wherein: a flexible outer cover is arranged outside the spring steel plate, and the flexible outer cover covers the part, exposed out of the seat body and between the seat body and the base, of the spring steel plate.

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