A seat pan and a seat

Abstract

The embodiment of the present application relates to the technical field of seat backrest adjustment, in particular to a seat chassis and a seat, the seat chassis comprising: a base, internally provided with a receiving cavity; a backrest support, one end of which is used for connecting a seat backrest, and the other end of which is rotationally connected with the base; a memory limiting block, provided on the backrest support, having a first arc surface facing the base; a locking slider, slidably provided in the receiving cavity of the base, having a second arc surface oppositely arranged with the first arc surface, the second arc surface being used for supporting and limiting the back-tilting rotation of the first arc surface, one side of the locking slider being provided with a first rack; a first elastic member, used for providing the locking slider with a reset elastic force for sliding towards the memory limiting block; and an elastic force slider, slidably provided in the receiving cavity of the base, one end of the elastic force slider being provided with a second rack, the second rack being engageable with the first rack. Through the above manner, the seat chassis of the embodiment of the present application can realize back-tilting memory adjustment of the seat backrest.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of seat backrest adjustment, in particular to a seat chassis and a seat. BACKGROUND

[0002] The seat is a necessity for people's daily life and office, in order to meet the different needs and different habits of users, the existing seat adjusts and fixes the inclination of the backrest forward inclination or backward inclination, so as to realize the support of the seat backrest to the human back at different angles. However, due to the structure limitation of the backrest adjusting mechanism, the backrest of most of the existing seats can only be adjusted to the required angle and fixed, and the backrest cannot follow the movement of the human back, so the comfort is poor. SUMMARY

[0003] In view of the above problems, the embodiment of the present application provides a seat chassis and a seat, which can realize the backward inclination memory adjustment of the seat backrest.

[0004] According to one aspect of the embodiment of the present application, a seat chassis for adjusting a seat backrest is provided, comprising: a base, which is internally provided with a receiving cavity; a backrest support, one end of which is used for connecting the seat backrest, and the other end is rotatably connected with the base, and the backrest support can be elastically reset; a memory limiting block, which is arranged on the backrest support, and the memory limiting block has a first arc surface facing the base; a locking slider, which is slidably arranged in the receiving cavity of the base, and the locking slider has a second arc surface arranged opposite to the first arc surface, and the second arc surface is used for supporting and limiting the backward inclination rotation of the first arc surface, so that the backrest support is backwardly inclined and limited, and one side of the locking slider is provided with a first rack; a first elastic member, which is connected between the locking slider and the base, and is used for providing the locking slider with a reset elastic force for sliding towards the memory limiting block; an elastic force slider, which is slidably arranged in the receiving cavity of the base, and one end of the elastic force slider is provided with a second rack, and the second rack can be engaged with the first rack, and is used for locking the locking slider.

[0005] In an optional mode, the seat chassis further comprises: a second elastic member, which is connected between the elastic force slider and the base, and is used for providing the elastic force slider with an elastic force for sliding away from the locking slider; a driving slider, which is slidably arranged in the receiving cavity of the base, and one side of the driving slider can abut against one end of the elastic force slider, and is used for limiting the sliding of the elastic force slider; and a third elastic member, which is connected between the driving slider and the base, and is used for providing the driving slider with an elastic force for sliding towards the elastic force slider.

[0006] In an alternative mode, the active slider has a first inclined surface, the elastic slider has a second inclined surface, when the active slider slides towards the elastic slider under the action of the third elastic member, the first inclined surface slides against the second inclined surface, so that the elastic slider slides towards the locking slider, and the second rack engages with the first rack.

[0007] In an alternative mode, the active slider has a first inclined surface, the elastic slider has a second inclined surface, when the active slider slides towards the elastic slider under the action of the third elastic member, the first inclined surface slides against the second inclined surface, so that the elastic slider slides towards the locking slider, and the second rack engages with the first rack.

[0008] In an alternative mode, the backrest support has two sides connected with the base through connecting arms, the seat chassis further comprises: a forward tilting block arranged on the inner side of the connecting arm; and a limiting slider slidably arranged in the accommodating cavity of the base, the limiting slider is capable of cooperating with the forward tilting block to limit the forward tilting rotation of the backrest support.

[0009] In an alternative mode, the forward tilting block has a limiting surface for abutting against the limiting slider to limit the forward tilting rotation of the backrest support.

[0010] In an alternative mode, the seat chassis further comprises: a fourth elastic member arranged on the base and connected with the limiting slider at one end to drive the limiting slider to slide away from the forward tilting block; and a fifth elastic member connected between the other end of the fourth elastic member and the base to provide elastic force for the limiting slider to slide towards the forward tilting block.

[0011] In an alternative mode, the fourth elastic member is connected with a second pull rope, when the second pull rope is pulled, the limiting slider slides to separate the limiting slider from the forward tilting block.

[0012] According to another aspect of the embodiments of the present application, a seat is provided, comprising the seat chassis.

[0013] In an alternative mode, the seat further comprises a cushion support arranged on the seat chassis, the cushion support is provided with a handle portion for controlling the adjustment of the seat chassis.

[0014] The backrest support rotates relative to the base via a pivot to adjust the backrest's tilt and forward movement. When the second rack on the spring slider engages with the first rack on the locking slider, the locking slider is locked, allowing the memory limit block to tilt forward. When the memory limit block tilts backward along the pivot until the first and second arc surfaces abut, the locking slider is locked, preventing further backward rotation and thus achieving the backrest support's tilt memory limit. Furthermore, the engagement and disengagement of the second rack on the spring slider with the first rack on the locking slider allows the locking slider to be locked at any position, enabling stepless adjustment of the tilt memory limit angle. Users can adjust to any tilt angle and lock it according to their needs, improving seat comfort. When in use, the backrest support can be elastically reset, so the seat back can automatically rest against the back of the user within the memory limit angle of the backrest support and rotate accordingly with the movement of the user's back. This allows the seat back to always be attached to the user's back to provide support, making the design more humane and further improving the comfort of sitting.

[0015] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of a seat chassis provided in an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the internal structure of a seat chassis provided in an embodiment of the present invention;

[0019] Figure 3 for Figure 2 A magnified structural diagram at point A;

[0020] Figure 4 This is a side view of the seat chassis in the separated state of the locking slider and the memory limiting block provided in an embodiment of the present invention.

[0021] Figure 5 for Figure 4 A side view of the structure of the memory limit block in the state of contact with the locking slider after it has rotated backward along the pivot.

[0022] Figure 6 For Figure 2 The local enlarged structure schematic view at B;

[0023] Figure 7 The structure schematic view of the front tilt clamping block and the locking sliding block in the seat chassis provided by the embodiment of the present application;

[0024] Figure 8 The side view structure schematic view of the front tilt clamping block and the locking sliding block in the seat chassis provided by the embodiment of the present application in the separated state;

[0025] Figure 9 For Figure 8 The side view structure schematic view of the front tilt clamping block in the seat chassis provided by the embodiment of the present application after the front tilt rotation along the rotation shaft and the abutting cooperation with the limiting sliding block;

[0026] Figure 10 The structure schematic view of the elastic strip in the seat chassis provided by the embodiment of the present application;

[0027] Figure 11 The structure schematic view of the seat cushion support and the seat chassis provided by the embodiment of the present application.

[0028] The reference numerals in the specific embodiment are as follows:

[0029] The seat chassis 100, the base 110, the back support 120, the connecting arm 121, the memory limiting block 130, the first arc surface 131, the locking sliding block 140, the second arc surface 141, the cover plate 142, the first elastic member 150, the elastic sliding block 160, the front tilt clamping block 170, the limiting surface 171, the limiting sliding block 180, the second elastic member 190, the driving sliding block 200, the third elastic member 210, the fourth elastic member 220, the fifth elastic member 221, the first pull rope 230, the second pull rope 240, the elastic strip 300, the support structure 310, the rotation shaft 500, the seat cushion support 10, the handle part 11. Specific embodiment

[0030] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0031] According to one aspect of the embodiment of the present application, a seat chassis and a seat are provided to enable the memory adjustment of the seat back.

[0032] Please refer to Figures 1 to 5 , the structure of the seat chassis and the structure of the internal adjusting mechanism thereof provided by the embodiment of the present application are schematically shown, and the side view structure of the cooperation and separation of the memory limiting block and the locking sliding block is schematically shown.

[0033] As shown in the figure, the seat chassis 100 comprises a base 110, a backrest support 120, a memory limit block 130, a locking slider 140, a first elastic member 150, and a spring slider 160. The base 110 is provided with a receiving cavity. The backrest support 120 is rotatably connected to the base 110 at one end for connecting a seat backrest, and automatically tilts back to reset through a spring or a torsional spring at the other end. The memory limit block 130 is arranged on the backrest support 120, and has a first arc surface 131 facing the base. The locking slider 140 is slidably arranged in the receiving cavity of the base 110, and has a second arc surface 141 arranged opposite to the first arc surface 131, which is used to support and limit the backward rotation of the first arc surface 131, thereby achieving the backward limit of the backrest support 120. The first elastic member 150 is connected between the locking slider 140 and the base 110, and is used to provide the locking slider 140 with a reset spring force for sliding towards the memory limit block 130. The spring slider 160 is slidably arranged in the receiving cavity of the base 110, and has a second rack at one end. A first rack is arranged on one side of the locking slider 140, and the second rack on the spring slider 160 can be engaged with the first rack on the locking slider 140, which is used to limit and lock the locking slider 140.

[0034] Please refer to Figures 3 to 5 , the backrest support 120 is rotatable relative to the base 110 through the rotating shaft 500 to achieve the adjustment of the backrest backward and forward. When the second rack on the spring slider 160 is engaged with the first rack on the locking slider 140, the locking slider 140 is locked, and at this time the memory limit block 130 can be tilted forward (for example, it can be in the state shown in Figure 4 When the memory limit block 130 is tilted backward along the rotating shaft 500 to abut the first arc surface 131 and the second arc surface 141 (for example, it can be in the state shown in Figure 5 ), since the locking slider 140 is locked, the memory limit block 130 cannot continue to tilt backward, thereby achieving the backward memory limit of the backrest support 120. And through the engagement and disengagement of the second rack on the spring slider 160 with the first rack on the locking slider 140, the locking slider 140 is locked after sliding to any position, thereby achieving the infinite adjustment of the backward memory limit angle, and the user can adjust it to any backward angle for memory locking according to the needs, thereby improving the comfort of the seat. In use, since the backrest support can be elastically reset, the seat backrest can be automatically rested on the back of the human body within the angle limited by the backrest support and follow the movement of the back of the human body for corresponding rotation adjustment, so that the seat backrest can be attached to the back of the human body at any time to provide support for the user, which is more humanized in design and further improves the comfort of the seat.

[0035] Please continue to refer to Figure 2 and Figure 3 In the specific embodiment shown in the figure, in order to limit the sliding track of the locking slider 140, a cover plate 142 is provided on the top of the locking slider 140, and the cover plate 142 is fixedly connected with the base 110 in a threaded manner.

[0036] Further, in order to improve the ease of use of the seat reclining limit, the present application further provides another embodiment, please refer to again Figure 3 In some embodiments, the seat chassis can further include a second elastic member 190, a driving slider 200, and a third elastic member 210. The second elastic member 190 (for example, it can be a torsion spring as shown in the figure) is connected between the elastic slider 160 and the base, for providing the elastic slider 160 with an elastic force away from the locking slider 140. The driving slider 200 is slidably arranged in the accommodating cavity of the base, and one side of the driving slider 200 abuts against one end of the elastic slider 160, for limiting the sliding of the elastic slider 160. The third elastic member 210 is connected between the driving slider 200 and the base, for providing the driving slider 200 with an elastic force towards the elastic slider 160.

[0037] When the driving slider 200 is made to slide against the elastic force of the third elastic member 210 (the sliding direction is as shown by the arrow direction on the driving slider 200 in the figure), the driving slider 200 no longer abuts against the elastic slider 160, so that the elastic slider 160 slides to the side of the driving slider 200 under the action of the second elastic member 190 (the sliding direction is as shown by the arrow direction on the elastic slider 160 in the figure), thereby making the second rack on the elastic slider 160 separate from the first rack on the locking slider 140, realizing the unlocking of the locking slider 140, and then the locking slider slides under the action of the first elastic member 150. Figure 3 Figure 3 Further, in order to improve the working efficiency between the driving slider and the elastic slider, the present application further provides another embodiment, please refer to again

[0038] Further, in order to improve the working efficiency between the driving slider and the elastic slider, the present application further provides another embodiment, please refer to again Figure 3 ​In the embodiment, the active sliding block 200 has a first inclined surface, and the elastic sliding block 160 has a second inclined surface, when the active sliding block 200 slides towards the elastic sliding block 160 under the action of the third elastic member 210, the first inclined surface of the active sliding block 200 slides against the second inclined surface of the elastic sliding block 160, so that the elastic sliding block 160 slides towards the locking sliding block 140, and the second rack on the elastic sliding block 160 meshes with the first rack on the locking sliding block 140. By arranging the first inclined surface on the active sliding block 200 and the second inclined surface on the elastic sliding block 160, when the active sliding block 200 slides towards the elastic sliding block 160 under the action of the third elastic member 210, the first inclined surface slides against the second inclined surface, and the first inclined surface on the active sliding block 200 provides a certain thrust to the second inclined surface on the elastic sliding block 160, thereby pushing the elastic sliding block 160 to slide towards the locking sliding block 140. The arrangement of the inclined surfaces optimizes the transmission structure between the active sliding block 200 and the elastic sliding block 160, and improves the transmission efficiency.

[0039] Please refer to Figure 3 In some embodiments, the active sliding block 200 is connected with a first pull rope 230, when the first pull rope 230 is pulled, the active sliding block 200 slides (the sliding direction is shown by the arrow on the active sliding block 200 in the figure), thereby separating the elastic sliding block 160 from the locking sliding block 140.

[0040] By arranging the first pull rope 230, the user can pull the first pull rope 230 from the outside of the seat or through the handle on the seat to control the locking and unlocking of the locking sliding block 140, thereby realizing the adjustment and locking of the memory angle of the seat backrest.

[0041] The seat chassis provided by the embodiments of the present application further comprises a forward tilting clamping block and a limiting sliding block, which are used to limit the forward tilting of the seat backrest, and specific details can be referred to Figure 6 and Figure 7 , which schematically show the structure of the forward tilting clamping block and the limiting sliding block in the seat chassis of the embodiments of the present application. In some embodiments, the two sides of the backrest support 120 can have a connecting arm 121 rotatably connected with the base 110, and the seat chassis further comprises a forward tilting clamping block 170 and a limiting sliding block 180. The forward tilting clamping block 170 is arranged on the inner side of the connecting arm 121, and the limiting sliding block 180 is slidably arranged in the accommodating cavity of the base 110, and the limiting sliding block 180 can cooperate with the forward tilting clamping block 170 to limit the forward tilting of the backrest support 120.

[0042] Through the cooperation of the forward tilting clamping block 170 and the limiting sliding block 180, the limiting of the forward tilting of the backrest support 120 to the fixed position is realized, and the harm to the human waist caused by the excessive forward tilting of the backrest support 120 is avoided.

[0043] Please refer to Figure 8 and Figure 9 , which respectively schematically show the side view structure of the cooperation and separation of the limiting slider 180 and the forward tilting block 170 in the seat chassis of an embodiment of the present application. In some embodiments, the forward tilting block 170 can have a limiting surface 171 facing the limiting slider 180, which is used to abut against the limiting slider 180 to limit the forward tilting rotation of the backrest support 120.

[0044] Please continue to refer to Figure 8 and Figure 9 , when the backrest support is rotated to the rearward tilting position, the limiting surface 171 of the forward tilting block 170 is separated from the limiting slider 180 (for example, in the state shown in Figure 8 , when the backrest support is rotated along the rotation shaft 500 to the forward tilting position, the limiting surface 171 of the forward tilting block 170 abuts against the limiting slider 180, and the limiting slider 180 limits the forward tilting rotation of the forward tilting block 170, thereby realizing the forward tilting limiting locking of the backrest support.

[0045] Please refer to Figure 6 and Figure 7 , in some embodiments, the seat chassis can further include a fourth elastic member 220 (for example, a torsion spring as shown in Figure 7 ) and a fifth elastic member 221 (for example, a spring as shown in Figure 7 ), the fourth elastic member 220 is arranged on the base and one end thereof is rotationally connected with the limiting slider 180, and is used to drive the limiting slider 180 to slide and separate from the forward tilting block 170. The fifth elastic member 221 is connected between the other end of the fourth elastic member 220 and the base, and is used to provide the limiting slider 180 with elastic force for sliding towards the forward tilting block 170. Please continue to refer to Figure 8 , when the fourth elastic member 220 is rotated (the rotation direction of the fourth elastic member 220 is shown by the arrow in Figure 7 ) and drives the limiting slider 180 to slide inward, the limiting slider 180 separates from the forward tilting block 170, so that the forward tilting block 170 can continue to rotate forward. When the fourth elastic member 220 is not subjected to external force, the elastic restoring force of the fifth elastic member 221 itself reverses the rotation of the fourth elastic member 220, and drives the limiting slider 180 to slide outward, so that the limiting slider 180 can again limit the cooperation with the forward tilting block 170.

[0046] Please refer to Figure 8 , in some embodiments, the second pull rope 240 can be connected to the fourth elastic member 220, when the second pull rope 240 is pulled, the limiting slider 180 slides, so that the limiting slider 180 separates from the forward tilting block 170.

[0047] By setting the second pull rope 240, the user can pull the second pull rope 240 from outside the seat or through the handle on the seat to control the cooperation and separation of the limiting slider 180 and the front tilting block 170, so as to realize the limiting and unlimiting of the rear tilting of the seat back.

[0048] In order to ensure the stability of the automatic front tilting reset structure of the back support, the application provides an embodiment, please refer to Figure 10 In some embodiments, the seat chassis can further include a resilient strip 300, one end of the resilient strip 300 being clamped on the base 110 and the other end being clamped on the back support 120, and the base 110 being provided with a support structure 310 for supporting the resilient strip 300.

[0049] By setting the resilient strip 300 and the support structure 310, when the back support 120 is tilted backward, the resilient strip 300 is pressed down to cause elastic deformation of the resilient strip 300, and when the seat back is no longer subjected to external force, the resilient strip 300 restores the deformation to drive the back support 120 to tilt forward and reset.

[0050] Those skilled in the art should understand that only examples are shown in the figures, and in other embodiments, the automatic front tilting reset of the back support can also be achieved by setting a torsional spring on the pivot connecting the back support and the base.

[0051] According to another aspect of the embodiment of the application, a seat is provided, which comprises the seat chassis of any one of the above embodiments.

[0052] Please refer to Figure 11 , which schematically shows the structure of the seat cushion support in the seat according to the embodiment of the application.

[0053] As shown in the figure, the seat can further include a seat cushion support 10, which is arranged on the seat chassis 100, and the seat cushion support 10 is provided with a handle part 11, which is used to control the adjustment of the seat chassis 100.

[0054] Please continue to refer to Figure 11 In the specific embodiment shown in the figure, the seat cushion support 10 is provided with a handle part 11 on each side, and the handle part 11 can pull the driving slider and the limiting slider respectively through the pull rope, so as to realize the locking and unlocking of the back tilting memory of the seat back, and the locking and unlocking of the front tilting, and further realize the convenient adjustment of the user on the back tilting memory limiting of the seat back.

[0055] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the application should be the usual meanings understood by the persons skilled in the art to which the embodiments of the application belong.

[0056] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the indicated seat chassis or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0057] In addition, the technical terms "first", "second", and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0058] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing", and the like should be broadly understood, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0059] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over", and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under", and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0060] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A seat pan for adjusting a seat back, characterized by, The seat base comprises: a base provided with a receiving cavity; a backrest support member, one end of which is used for connecting a seat backrest, and the other end of which is rotatably connected to the base, the backrest support member being elastically resettable; a memory limiting block provided on the backrest support member, the memory limiting block having a first arc surface facing the base; a locking slider slidably provided in the receiving cavity of the base, the locking slider having a second arc surface oppositely arranged to the first arc surface, the second arc surface being used for supporting and limiting the backrest support member from being tilted backward, one side of the locking slider being provided with a first rack; a first elastic member connected between the locking slider and the base, the first elastic member being used for providing the locking slider with a reset elastic force for sliding toward the memory limiting block; a spring slider slidably provided in the receiving cavity of the base, one end of the spring slider being provided with a second rack, the second rack being capable of engaging with the first rack, and the spring slider being used for locking the locking slider; a second elastic member connected between the other end of the fourth elastic member and the base, the second elastic member being used for providing the spring slider with an elastic force for sliding away from the locking slider; a driving slider slidably provided in the receiving cavity of the base, one side of the driving slider being capable of abutting against one end of the spring slider, the driving slider being used for limiting the spring slider from sliding; the driving slider being connected with a first pull rope, when the first pull rope is pulled, the driving slider slides, and the spring slider is separated from the locking slider; 2. The seat pan of claim 1, wherein, a third elastic member connected between the driving slider and the base, the third elastic member being used for providing the driving slider with an elastic force for sliding toward the spring slider.

3. The seat pan of claim 1, wherein, The driving slider has a first inclined surface, and the spring slider has a second inclined surface, when the driving slider slides toward the spring slider under the action of the third elastic member, the first inclined surface and the second inclined surface oppositely slide, the spring slider slides toward the locking slider, and the second rack engages with the first rack. The backrest support member has connecting arms rotatably connected to the base, and the seat base further comprises: a forward tilting block provided on the inner side of the connecting arm; a limiting slider slidably provided in the receiving cavity of the base, the limiting slider cooperating with the forward tilting block, and being used for limiting the forward tilting of the backrest support member; the forward tilting block has a limiting surface, the limiting surface being used for abutting against the limiting slider to limit the forward tilting of the backrest support member; the seat base further comprises: a fourth elastic member provided on the base, one end of the fourth elastic member being connected with the limiting slider, the fourth elastic member being used for driving the limiting slider to slide inward and separate from the forward tilting block, so that the forward tilting block can continue to tilt forward; 4. The seat pan of claim 3, wherein, a fifth elastic member connected between the other end of the fourth elastic member and the base, the fifth elastic member being used for providing the limiting slider with an elastic force for sliding toward the forward tilting block.

5. A seat, characterized by the fourth elastic member is connected with a second pull rope, when the second pull rope is pulled, the limiting slider slides, and the limiting slider separates from the forward tilting block. The seat base comprises the seat base as claimed in any one of claims 1-4.

6. The seat of claim 5, wherein, The seat further comprises a seat cushion support provided on the seat pan, the seat cushion support being provided with a handle portion for controlling adjustment of the seat pan.

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