Patent Description:
At present, for conventional seats, such as office chairs, gaming chairs and the like, heights and front-rear positions of seat cushions, reclining angles and support forces of backrests are adjustable.

However, due to differences in the position, force and other factors of each adjustment mechanism, it is necessary to arrange a plurality of adjustment members on the seat to achieve adjustments in cooperation with different adjustment mechanisms. During use, due to a large number of adjustment members on the seat, users are liable to make erroneous adjustments, which affects user experience.

In view of the above problem, embodiments of the present disclosure provide a seat adjustment module, a seat frame assembly. A plurality of adjustment functions in the seat are integrated, such that an adjustment structure of the seat is optimized, and user experience is enhanced.

According to the invention, a seat adjustment module is provided. The seat adjustment module includes: a base; a stop block, slidably connected to the base, and configured to stop forward and backward movements of a seating member in a seat; a rotary block, rotatably connected to the base, and configured to, in response to being rotated along a first rotation direction, drive the stop block to slide by a transmission member to release restrictions applied by the stop block on the forward and backward movements of the seating member, wherein the rotary block is further configured to, in response to being rotated along a second rotation direction, pull a first transmission rope to move to open a backrest adjustment switch in the seat, the second rotation direction being opposite to the first rotation direction; a handle, rotatably connected to one end of the rotary block, and configured to, in response to being rotated with respect to the rotary block, pull a second transmission rope to move to open a lifter switch of the seat; and a twistable adjustment member, rotatably connected to the base, and configured to be connected to a backrest elastic force adjustment mechanism by a flexible transmission member, wherein the twistable adjustment member is configured to, in response to being rotated, adjust a magnitude of an elastic force of a backrest in the seat by the flexible transmission member.

Further according to the invention, the rotary block is arranged to run through the base, one end of the rotary block is connected to the handle, and the twistable adjustment member is situated on an outer circumference of the handle; and a through hole configured to allow the second transmission rope to travel through is arranged in the base, the through hole being extended along the first rotation direction or the second rotation direction of the rotary block.

In an optional embodiment, a transmission structure is circumferentially arranged on the twistable adjustment member, and a driven wheel is rotatably arranged on the base, wherein the driven wheel is transmissively engaged with the transmission structure, and the flexible transmission member is connected to the driven wheel.

In an optional embodiment, the flexible transmission member includes a third transmission rope, wherein two ends of the third transmission rope are wound and secured to the driven wheel along opposite directions, the driven wheel is configured to be connected to the backrest elastic force adjustment mechanism by the third transmission rope, and the twistable adjustment member is configured to, in response to being rotated, drive, via the driven wheel and the third transmission rope, the backrest elastic force adjustment mechanism to move to adjust the magnitude of the elastic force of the backrest in the seat; or the flexible transmission member includes a flexible transmission shaft, wherein the driven wheel is configured to be connected to the backrest elastic force adjustment mechanism by the flexible transmission shaft, and the twistable adjustment member is configured to, in response to being rotated, drive, via the driven wheel and the flexible transmission shaft, the backrest elastic force adjustment mechanism to move to adjust the magnitude of the elastic force of the backrest in the seat.

In an optional embodiment, the flexible transmission shaft includes a soft shaft.

In an optional embodiment, a stop portion thereof is arranged at one end of the stop block along a slide direction, wherein the stop portion is configured to be engaged with the seating member to stop the forward and backward movements of the seating member; and an abutment portion is arranged at another end of the stop block along the slide direction thereof, wherein the transmission member is a lug arranged on a circumferential side wall of the rotary block, the rotary block is configured to, in response to being rotated with respect to the base along the first rotation direction, cause the lug to abut against the abutment portion to drive the stop block to slide such that restrictions applied by the stop block on the forward and backward movements of the seating member are released; and/or a connecting portion is arranged at another end of the stop block along the slide direction thereof, wherein the transmission member is a fourth transmission rope connected between the connecting portion and the rotary block, the rotary block is configured to, in response to being rotated with respect to the base along the first rotation direction, pull the fourth transmission rope to move to drive the stop block to slide such that restrictions applied by the stop block on the forward and backward movements of the seating member are released.

In an optional embodiment, a strip-shaped opening extending along the slide direction of the stop block is arranged in the abutment portion; wherein the lug is configured to, in response to the rotary block being rotated with respect to the base along the first rotation direction, be abutted against an inner wall at one end of the strip-shaped opening to drive the stop block to slide; and the lug is further configured to, in response to the rotary block being rotated with respect to the base along the second rotation direction, move in the strip-shaped opening but is not in structural interference with the abutment portion.

In an optional embodiment, a plurality of position engagement portions are arranged on a circumferential side wall of the rotary block, and an engagement member is arranged on the base, wherein the engagement member is configured to be engaged with different position engagement portions in response to the rotary block being rotated.

In an optional embodiment, the rotary block includes a first body and a second body, wherein the first body is connected between the handle and the second body; and a torsional elastic member is connected between the first body and the second body, and the second body is configured to drive the stop block to slide by the transmission member.

In an optional embodiment, a restoration elastic member is arranged between the stop block and the base, wherein the restoration elastic member is configured to apply a restoration elastic force to the stop block, such that the stop block is automatically restored and engaged with the seating member when no force is applied by the rotary block.

According to another aspect of the embodiments of the present disclosure, a seat frame assembly is provided. The seat frame assembly includes: a frame and the seat adjustment module as described above, wherein the seat adjustment module is arranged on the frame.

In an optional embodiment, the frame includes a support frame and a seating member frame, wherein the seating member frame is forward and backward slidably connected to the support frame; the seat adjustment module is arranged on the support frame, and the seat adjustment module is situated at a junction between the support frame and the seating member frame; and a slidable position section is arranged on the seating member frame, wherein the stop block is in a snap-fit engagement with the slidable position section.

In an optional embodiment, the frame includes a backrest, and the support frame includes a chassis, an elastic sheet being arranged the chassis and the backrest; wherein a fulcrum structure is arranged on the chassis, the fulcrum structure being abutted against the elastic sheet such that the elastic sheet supplies a support elastic force to the backrest; a rotatable adjustment member is connected to the fulcrum structure, and the flexible rotation member includes a flexible rotary shaft, wherein the flexible rotary shaft is connected to the rotatable adjustment member, and the twistable adjustment member is configured to, in response to being rotated, drive the rotatable adjustment member to rotate by the flexible rotary shaft, such that the fulcrum structure slides with respect to the chassis to alter a magnitude of the support elastic force supplied by the elastic sheet to the backrest; or a tension mechanism is arranged on the chassis, and the flexible rotation member comprises a third transmission rope, wherein the third transmission rope is wound on the tension mechanism, two ends of the third transmission rope are wound and secured on the twistable adjustment member along an opposite direction, and the third transmission rope is securely connected to the fulcrum structure; and when the twistable adjustment member is rotated, the fulcrum structure is driven by the third transmission rope to slide with respect to the chassis to alter a magnitude of the support elastic force supplied by the elastic sheet to the backrest.

According to still another aspect of the embodiments of the present disclosure, a seat is provided. The seat includes the seat frame assembly as described above.

In summary, in the seat adjustment module according to the embodiments of the present disclosure, by integrating the stop block on the base, it is ensured that the transmission member driving the stop block to slide has sound stability. By causing the rotary block to rotate along two opposite directions, the function of adjusting forward and backward movements of the seating member and the function of adjusting the reclining angle of the backrest are implemented. By causing the handle to rotate with respect to the rotary block, lift adjustment is achieved for the seat. In the meantime, the twistable adjustment member is rotatably integrated on the base, and direction-variable driving on the backrest elastic force adjustment mechanism by the twistable adjustment member is achieved via the flexible transmission member. In this way, the magnitude of the elastic force of the backrest is adjusted. The entire seat adjustment module has a compact structure and has a high integration of functions. During use, the user may not be confused in adjustment functions, and thus user experience is greatly improved.

The above description only summarizes the technical solutions of the present disclosure. Specific embodiments of the present disclosure are described hereinafter to better and clearer understand the technical solutions of the present disclosure, to practice the technical solutions based on the disclosure of the specification, and to make the above and other objectives, features and advantages of the present disclosure more apparent and understandable.

By reading the detailed description of preferred embodiments hereinafter, various other advantages and beneficial effects become clear and apparent for persons of ordinary skill in the art. The accompanying drawings are merely for illustrating the preferred embodiments, but shall not be construed as limiting the present disclosure. In all the accompanying drawings, like reference numerals denote like parts. In the drawings:.

Reference numerals in the embodiments and denotations thereof:.

The embodiments containing the technical solutions of the present disclosure are described in detail with reference to the accompanying drawings. The embodiments hereinafter are only used to clearly describe the technical solutions of the present disclosure. Therefore, these embodiments are only used as examples, but are not intended to limit the protection scope of the present disclosure.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure pertains. The terms used herein in the specification of present disclosure are only intended to illustrate the specific embodiments of the present disclosure, instead of limiting the present disclosure. The terms "comprise," "include," and any variations thereof in the specification, claims, and the description of the drawings of the present disclosure are intended to cover a non-exclusive inclusion.

In the description of the present disclosure, the terms "first," "second," and the like are only used for distinguishing different objects, but shall not be understood as indication or implication of relative importance or implicit indication of the number of the specific technical features, the specific sequence or priorities. In the description of the embodiments of the present disclosure, the term "multiple" or "a plurality of" signifies at least two, unless otherwise specified.

The terms "example" and "embodiment" in this specification signify that the specific characteristic, structures or features described with reference to the embodiments may be covered in at least one embodiment of the present disclosure. This term, when appearing in various positions of the description, neither indicates the same embodiment, nor indicates an independent or optional embodiment that is exclusive of the other embodiments. A person skilled in the art would implicitly or explicitly understand that the embodiments described in this specification may be incorporated with other embodiments.

In the description of the embodiments of the present disclosure, the term "and/or" is merely an association relationship for describing associated objects, which represents that there may exist three types of relationships, for example, A and/or B may represent three situations: only A exists, both A and B exist, and only B exists. In addition, the forward-slash symbol "/" generally represents an "or" relationship between associated objects before and after the symbol.

In the description of the embodiments of the present disclosure, the term "multiple" or "a plurality of" signifies more than two (including two), unless otherwise specified. Likewise, the term "a plurality of groups" or "multiple groups" signifies more than two groups (including two groups), and the term "a plurality of pieces" or "multiple pieces" signifies more than two pieces (including two pieces).

In the description of the embodiments of the present disclosure, it should be understood that the terms "central," "transversal," "longitudinal," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like indicate orientations and position relationships which are based on the illustrations in the accompanying drawings, and these terms are merely for ease and brevity of the description, instead of indicating or implying that the devices or elements shall have a particular orientation and shall be structured and operated based on the particular orientation. Accordingly, these terms shall not be construed as limiting the present disclosure.

In the description of the embodiments of the present disclosure, it should be noted that unless otherwise specified and defined, the terms "mounted," "coupled," "connected," "secured," and derivative forms thereof shall be understood in a broad sense, which, for example, may be understood as secured connection, detachable connection or integral connection; may be understood as mechanical connection or electrical connection, or understood as direct connection, indirect connection via an intermediate medium, or communication between the interiors of two elements or interactions between two elements. Persons of ordinary skill in the art may understand the specific meanings of the above terms in the embodiments of the present disclosure according to the actual circumstances and contexts.

In a conventional seat, generally a height of a seat cushion is adjusted by a height adjustment lever at the bottom of the seat. Specifically, when a user raises one end of the height adjustment lever, the height adjustment lever is rotated, such that another end of the height adjustment lever is lowered down and presses a pneumatic valve on a pneumatic bar, which facilitates adjustment of the height of the seat cushion. The similar principle applies for adjustment of backrest reclining. Specifically, when one end of a reclining adjustment lever at the bottom of the seat is raised, the reclining adjustment lever is rotated, such that another end of the reclining adjustment lever is lowered down, and hence a catch block at the another end is disengaged from backrest reclining position recesses. In this way, a backrest reclining angle is adjusted.

With respect to the adjustment of an elastic force of a backrest, generally a twist bar is extended at an elastic force adjustment section on a chassis. By rotating the twist bar, a fulcrum position of an elastic sheet supplying an elastic force to the backrest in the chassis is adjusted, and the elastic force of the backrest is adjusted.

For the adjustment of forward and backward movements of the seat cushion, typically a split-type structure is adopted. Specifically, position recesses are arranged at a junction where a support frame is slidably connected to a side of a seat cushion frame, the seat cushion frame is provided with a clamping block, and an adjustment mechanism on the same side of the support frame pulls the clamping block on the seat cushion frame to slide via a steel rope, such that the clamping block is disengaged from the position recesses, such that the forward and backward movements of the seat cushion frame are unlocked. With regard to this adjustment approach, since the clamping block is provided on the seat cushion frame and moves forward and backward together with the seat cushion frame, and the adjustment mechanism is secured on the support frame and the position thereof may not be changed, it is necessary to provide the two as separate structures and implement transmission of a tensile force by steel rope connection. A protective sleeve with two ends thereof respectively connected to the clamping block and the adjustment mechanism is sleeved onto the outside of the steel rope, to ensure that the steel rope is capable of moving in the protective sleeve when being pulled, thereby unlocking the clamping block. However, during forward and backward adjustments of the seat cushion, a relative position between the clamping block and the adjustment mechanism may be changed, such that the steel rope between the clamping block and the adjustment mechanism and the protective sleeve outside the steel rope are deformed repeatedly, which reduces the service life of the steel rope and the protective sleeve. In addition, when a distance between the clamping block and the adjustment mechanism is reduced, the two ends of the steel rope and the protective sleeve are close to each other, and consequently, the middle part of the steel rope and the protective sleeve is elongated and easily rubbed with other parts on the support frame, resulting in the wear of the protective sleeve, and further reducing the service life of the protective sleeve.

It can be seen from the above that, in the conventional seat, since the adjustment function is complex, a large number of adjustment mechanisms are desired and these mechanisms are densely distributed. Therefore, users may be easily confused in recognizing and using corresponding functions of the adjustment mechanisms, and thus user experience is affected.

In view of the above-mentioned problems, the inventors of the present disclosure devise an integrated adjustment module to simultaneously adjust multiple functions of a seat. Based on this, the inventors take into consideration that since the parts for implementing different functions in the seat are arranged at different positions, how to design the structures of the adjustment module and a transmission member, and how to use a movement relationship between the adjustment module and the transmission member are challenging in achieving integration of the adjustment module.

In order to achieve the above object, the inventors have studied that, forward and backward movements of the seating member and the reclining angle of the backrest are adjusted by rotation of the rotary block on the base in two opposite rotation directions is used. Specifically, when the rotary block is rotated in a first rotation direction, the stop block is driven, via the transmission member, to slide to release the restriction on the forward and backward movements of the seating member, and the forward and backward movements of the seat cushion are adjusted; and when the rotary block is rotated in a second rotation direction, a first transmission rope is pulled to move, and then the first transmission rope opens a lock member for adjusting the reclining angle of the backrest to adjust the reclining angle of the backrest.

Since the stop block is integrated on the base, a relative position between the stop block and the rotary block is not changed, thereby ensuring the stability of the structure.

With regard to the lift adjustment of the seat cushion, a handle rotatably connected to the rotary block is used to achieve the lift adjustment for the seat cushion. Specifically, when the handle is rotated with respect to the rotary block, a second transmission rope is pulled to move, and the second transmission rope then pulls a press member on a pneumatic bar on the seat, such that the press member presses a pneumatic valve on the pneumatic bar to achieve the lift adjustment for the seat cushion.

An elastic force of the backrest is adjusted by means of a twistable adjustment member in combination with a flexible transmission member. Specifically, when the twistable adjustment member is rotated, a support position of a fulcrum structure on a chassis to an elastic sheet is adjusted via the flexible transmission member, so as to alter a magnitude of a support elastic force applied by the elastic member to the backrest. In this way, the magnitude of the elastic force of the backrest is adjusted.

Based on the above inventive concept, according to one aspect of the embodiments of the present disclosure, a seat adjustment module is provided. Referring to <FIG> and <FIG>, <FIG> illustrates a three-dimensional structure, taken from a view angle, of a seat adjustment module <NUM> according to an embodiment of the present disclosure, and <FIG> illustrates an internal structure of the seat adjustment module <NUM>. As illustrated in <FIG> and <FIG>, the seat adjustment module <NUM> includes: a base <NUM>, a stop block <NUM>, a rotary block <NUM>, a handle <NUM>, and a twistable adjustment member <NUM>. The stop block <NUM> is slidably connected to the base <NUM>, and is configured to stop forward and backward movements of a seating member in a seat. The rotary block <NUM> is rotatably connected to the base <NUM>, and is configured to, in response to being rotated along a first rotation direction (a direction indicated by an arrow a in <FIG>), drive the stop block <NUM> to slide by a transmission member <NUM> to release restrictions applied by the stop block <NUM> on the forward and backward movements of the seating member. The rotary block <NUM> is further configured to, in response to being rotated along a second rotation direction (a direction indicated by an arrow b in <FIG>), pull a first transmission rope <NUM> to move to open a backrest adjustment switch in the seat, wherein the second rotation direction is opposite to the first rotation direction.

Referring to <FIG> and <FIG>, structures of a handle from two view angles are respectively illustrated. As illustrated in <FIG> and <FIG>, the handle <NUM> is rotatably connected to one end of the rotary block <NUM>, and is configured to, in response to being rotated with respect to the rotary block <NUM>, pull a second transmission rope (not illustrated) to move to open a lifter switch of the seat.

Still referring to <FIG>, the twistable adjustment member <NUM> is rotatably connected to the base, and the twistable adjustment member <NUM> is configured to be connected to a backrest elastic force adjustment mechanism by a flexible transmission member (not illustrated), and is configured to, in response to being rotated, adjust an elastic force of a backrest in the seat by the flexible transmission member.

With respect to the fashion of restricting forward and backward movements of the seating member by the stop block <NUM>, reference may be made to <FIG>, and further made to <FIG> which illustrates an application scenario of the seat adjustment module. As illustrated in <FIG>, a seating member frame <NUM> is slidably connected a support frame <NUM> along a front-rear direction, a slidable position section <NUM> is arranged on the seating member frame <NUM>, the seat adjustment module <NUM> is mounted on the support frame <NUM>, and the stop block <NUM> is in snap-fit engagement with the slidable position section <NUM> to restrict forward and backward movements of the seating member frame <NUM>. The rotary block <NUM>, in response to being rotated along the direction indicated by the arrow a in <FIG>, drives the stop block <NUM> to move downward, such that the stop block <NUM> is disengaged from the slidable position section <NUM>. In this way, front and rear positions of the seating member frame <NUM> are adjusted. It should be noted that the transmission member <NUM> may be a lug arranged on a circumferential side wall of the rotary block <NUM> as illustrated in <FIG>, or may be a pull rope secured to the circumferential side wall of the rotary block <NUM>, and the rotary block <NUM>, in response to being rotated, drives the stop block <NUM> to move by the lug or pulls the stop block to move by the pull rope.

With respect to the fashion of opening the backrest adjustment switch by the rotary block <NUM>, still referring to <FIG>, a mounting recess <NUM> may be arranged in one end of the rotary block <NUM>, a first passing hole <NUM> is arranged in the base <NUM>, a first passing channel is defined between the first mounting recess <NUM> and the first passing hole <NUM>, and the first passing channel runs through at least part of the circumferential side wall of the rotary block <NUM>. One end of the first transmission rope <NUM> is secured into the first mounting recess <NUM>, the first transmission rope <NUM> is extended along the first passing channel to pass through the first passing hole <NUM>, and another end of the transmission rope <NUM> is connected to the backrest adjustment switch. It may be understood that the first mounting recess <NUM> may not be arranged, the first transmission rope <NUM> is securely connected to the rotary block <NUM> by threads or the like fashions, and when the first rotary block <NUM> is a metal structure, the first transmission rope <NUM> may also be securely connected to the rotary block <NUM> by welding.

With respect to the structure of the backrest adjustment switch, referring to <FIG>, a backrest adjustment switch <NUM> includes a sliding block <NUM> and a backrest position structure <NUM>. The sliding block <NUM> is slidably arranged on a chassis <NUM> along directions indicated by arrows in <FIG>. The sliding block <NUM> is in snap-fit engagement with a docking recess in the backrest position structure <NUM> to restrict reclining rotation of the backrest. The first transmission rope (not illustrated in <FIG>) is passed out one end of the first passing hole <NUM> and is connected to the sliding block <NUM>, such that when the first transmission rope is displaced in response to being pulled by the rotary block <NUM>, the first transmission rope drives the sliding block <NUM> to slide backward along the directions indicated by the arrows in <FIG>. In this way, the sliding block <NUM> is disengaged from the docking recess in the backrest position structure <NUM>, such that the backrest switch <NUM> is unlocked.

Further, as illustrated in <FIG>, a torsional spring <NUM> may also be rotatably arranged on the chassis <NUM>. One end of the torsional spring <NUM> is connected to the sliding block <NUM>, and another end of the torsional spring <NUM> is connected to an end portion of the first transmission rope. The first transmission rope may pull one end of the torsional spring <NUM>, such that the torsional spring <NUM> is rotated, and another end of the torsional spring <NUM> drives the sliding block <NUM> to slide backward along the directions indicated by the arrows in <FIG>, thereby achieving unlocking. With the torsional spring <NUM>, when the user is leaning against the backrest such that the sliding block <NUM> is dead-locked in the backrest position structure <NUM>, the first transmission rope is still normally subject to displacement and hence drives one end of the torsional spring <NUM> connected to the first transmission rope whereas one end of the torsional spring <NUM> connected to the sliding block <NUM> is not subject to rotation because sliding of the sliding block <NUM> is restricted. In this case, the torsional spring <NUM> itself has a restoration elastic force, and when the back of the user leaves from the backrest and the user is about to adjust the backrest reclining angle, dead-lock of the sliding block <NUM> in the backrest position structure <NUM> is released, and the sliding block <NUM> slides backward under the effect of the elastic force supplied by the torsional spring <NUM>, such that the sliding block is disengaged and unlocked from the docking recess in the backrest position structure <NUM>.

Further, as illustrated in <FIG>, a first guiding structure <NUM> may also be arranged on the chassis <NUM>. The first transmission rope is passed through the first guiding structure <NUM> and is connected to the torsional spring <NUM>. The first guiding structure <NUM> is configured to restrict and guide an extension direction of the first transmission rope, such that the first transmission rope applies a pull force in a more suitable direction. A spring may also be arranged between an output end (that is, one end facing towards the torsional spring <NUM> in <FIG>) of the first guiding structure <NUM> and an end, connected to one end of the first transmission rope, of the torsional spring <NUM>. The spring may be sleeved on this section of the first transmission rope. When the first transmission rope is pulled, the torsional spring <NUM> is rotated such that the spring is compressed. When the first transmission rope is released, the spring is extended to restore from deformation and pushes the torsional spring <NUM> to rotate reversely, such that the sliding block <NUM> slides forward and is in snap-fit engagement with the docking recess in the backrest position structure <NUM>. In this way, the backrest adjustment switch <NUM> is automatically restored and locked. It may be understood that with respect to an example where no torsional spring <NUM> is arranged, a spring may also be directly arranged between the first guiding structure <NUM> and the sliding block <NUM>, such that the sliding block <NUM> is automatically restored.

Hereinabove, the specific structures for adjustment of the forward and backward movements of the seating member and adjustment of the reclining angle of the backrest are described. It should be noted herein that with respect to the view angle as illustrated in <FIG>, when the rotary block <NUM> according to the specific embodiment as illustrated in <FIG> is counterclockwise rotated, the stop block <NUM> is driven to move to unlock the forward and backward movements of the seating member; and when the rotary block <NUM> is clockwise rotated, the first transmission rope <NUM> is pulled, such that the backrest adjustment switch is unlocked. In other embodiments, the stop block <NUM> may also be on another side opposite to the rotary block <NUM>, and the first transmission rope <NUM> is extended along another opposite direction, such that the rotary block <NUM> has a rotation direction rightly opposite to the direction as illustrated in <FIG> during unlocking the forward and backward movements of the seating member and unlocking the backrest adjustment switch.

With respect to the corresponding relationship between the rotation direction and the adjustment function of the rotary block <NUM>, the present disclosure provides a preferred example. Specifically, referring to <FIG>, a structure of a seat frame assembly according to an embodiment of the present disclosure is illustrated. As illustrated in <FIG>, the seat adjustment module <NUM> is arranged at a junction between the support frame <NUM> and the seating member frame <NUM>, and when the user is seated on the seat, the seat adjustment module <NUM> is situated under the right hand of the user. In further combination with <FIG> and <FIG>, the handle <NUM> faces towards an outer side of the seat frame assembly, and the user may rotate the handle <NUM> with the right hand to drive the rotary block <NUM> to rotate, such that the corresponding adjustment function is implemented. When the user forward twists (equivalent to counterclockwise twisting in the view angle as illustrated in <FIG>) the handle <NUM> with the right hand, the function of adjusting the forward and backward movements of the seating member is unlocked. When the user backward twists (equivalent to clockwise twisting in the view angle as illustrated in <FIG>) the handle <NUM> with the right hand, the function of adjusting the reclining angle of the backrest is unlocked. Such configurations more accommodate user's habits, and the user is prevented from mis-adjustment during use.

With respect to the adjustment of the lifter switch, first in combination of <FIG>, <FIG>, and <FIG>, a second mounting recess <NUM> may be arranged in the handle <NUM>, and a second passing hole <NUM> may be arranged in the base <NUM>. A second passing channel is defined between the first mounting recess <NUM> and the second passing hole <NUM>. One end of the second transmission rope is secured into the second mounting recess <NUM>. The second transmission rope is extended out of the second passing hole <NUM> along the second passing channel, and is connected to the lifter switch. In response to being rotatably lifted along a direction indicated by an arrow c in <FIG>, the handle <NUM> pulls the second transmission rope to move. It may be understood that the arrow c in <FIG> is drawn on the structure of the handle <NUM>, which is merely for description of the rotation direction of the handle <NUM>. In a practical product, the arrow c is not necessarily marked on the handle <NUM>. It should be noted that to accommodate user's habits, in the specific embodiment as illustrated in <FIG>, a structure configured to drive the second transmission rope to move when the handle <NUM> is rotatably lifted. However, in other embodiments, the second transmission rope may also be driven to move by rotatably pressing down the handle <NUM>, or by rotatably pushing forward or merely rotating the handle <NUM>, which is not limited herein.

With respect to the structure of the lifter switch, reference may be made to <FIG>. As illustrated in <FIG>, a pneumatic bar mounting hole <NUM> is arranged in the chassis <NUM>, and a top end of a pneumatic bar (not illustrated) supporting the chassis <NUM> is arranged in the pneumatic bar mounting hole <NUM>. In addition, a pneumatic valve is arranged at the top end of the pneumatic bar. When the pneumatic valve is pressed down, lift adjustment is achieved for the pneumatic bar. As illustrated in <FIG>, the lifter switch includes a pressing structure <NUM> rotatably arranged on the pneumatic bar mounting hole <NUM>, and a second guiding structure <NUM> is further arranged on the chassis <NUM>. The second transmission rope travels through the second guiding structure <NUM>, and then is extended along a longitudinal direction and is securely connected to an end portion of the pressing structure <NUM>. In response to moving under a pull force, the second transmission rope pulls the pressing structure <NUM> to rotate downward, and the pressing structure <NUM> presses down and open the pneumatic valve on the pneumatic bar, such that lift adjustment is achieved for the seat.

With respect to the adjustment of an elastic force of the backrest, specifically, the twistable adjustment member <NUM> may employ a rotation bar (not illustrated) rotatably connected to the base <NUM>, and the flexible transmission member may employ a flexible transmission shaft (not illustrated in <FIG>). One end of the rotation bar is connected to one end of the flexible transmission shaft. When the user rotates the rotation bar, the rotation bar drives the flexible transmission shaft to rotate.

Referring to <FIG>, a backrest elastic structure of the backrest is illustrated. As illustrated in <FIG>, an elastic sheet <NUM> is arranged on the chassis <NUM>, and a backrest <NUM> is rotatably connected to the chassis <NUM>. Two ends of the elastic sheet <NUM> are respectively abutted against the chassis <NUM> and the backrest <NUM>, such that the elastic sheet <NUM> is pressed tightly between the chassis <NUM> and the backrest <NUM> to supply a support elastic force to the backrest <NUM>. A fulcrum structure <NUM> is arranged on the chassis <NUM>. The fulcrum structure <NUM> is supported at a bottom of the elastic sheet <NUM> to supply a fulcrum for bending deformation to the elastic sheet <NUM>.

Referring to <FIG>, an internal structure of the chassis is illustrated. As illustrated in <FIG>, a screw <NUM> is rotatably arranged in the chassis <NUM>. The screw <NUM> is threaded to the fulcrum structure <NUM>, such that in response to being rotated, the screw <NUM> drives the fulcrum structure <NUM> to move along an axial direction (directions indicated by arrows in <FIG>) of the screw <NUM> to adjust a support position of the fulcrum structure <NUM> on the elastic sheet <NUM>, such that a magnitude of the elastic force supplied by the elastic sheet <NUM> to the backrest <NUM> is altered.

Still referring to <FIG>, the backrest elastic force adjustment mechanism includes a rotary shaft <NUM> rotatably arranged on the chassis <NUM>. The rotary shaft <NUM> may be arranged to be perpendicular to the screw <NUM>, and the rotary shaft <NUM> and the screw <NUM> are meshed with each other via a bevel gear. One end, facing away from the screw <NUM>, of the rotary shaft <NUM> is securely connected to another end, facing away from the rotation bar, of the flexible transmission shaft, such that when the rotation bar is rotated, a torque of the rotation bar is transmitted to the rotary shaft <NUM> via the flexible transmission shaft to drive the rotary shaft <NUM> to rotate, such that the screw <NUM> is caused to rotate to adjust the support position of the fulcrum structure <NUM> on the elastic sheet <NUM>. In this way, the magnitude of the elastic force of the backrest is adjusted. It may be understood that in other embodiments, the backrest elastic force adjustment mechanism may be directly the screw <NUM>. The flexible transmission shaft is directly connected to one end of the screw <NUM>, such that in response to being rotated, the rotation bar directly drives, via the flexible transmission shaft, the screw <NUM> to rotate, such that the magnitude of the elastic force of the backrest is adjusted.

It should be noted that to reduce the size of the stop block <NUM>, the seat adjustment module <NUM> is typically mounted on the junction between the support frame and the seating member frame. This results in that the twistable adjustment member <NUM> fails to be coaxially arranged with the backrest elastic force adjustment mechanism. By transmitting a torque of the twistable adjustment member <NUM> via the flexible transmission shaft to the backrest elastic force adjustment mechanism, the elastic force adjustment function of the backrest is implemented, but also no restriction is caused to the mounting position of the seat adjustment module <NUM>.

In summary, in the seat adjustment module <NUM> according to the embodiments of the present disclosure, by integrating the stop block <NUM> on the base <NUM>, it is ensured that the transmission member <NUM> driving the stop block <NUM> to slide has sound stability. By causing the rotary block <NUM> to rotate along two opposite directions, the function of adjusting forward and backward movements of the seating member and the function of adjusting the reclining angle of the backrest are implemented. By causing the handle <NUM> to rotate with respect to the rotary block <NUM>, lift adjustment is achieved for the seat. In the meantime, the twistable adjustment member <NUM> is rotatably integrated on the base <NUM>, and direction-variable driving on the backrest elastic force adjustment mechanism by the twistable adjustment member <NUM> is achieved via the flexible transmission member. In this way, the magnitude of the elastic force of the backrest is adjusted. The entire seat adjustment module <NUM> has a compact structure and has a high integration of functions. During use, the user may not feel be confused in adjustment functions, and thus user experience is greatly improved.

To reduce the size of the seat adjustment module <NUM>, the represent disclosure provides an example. Referring to <FIG> and <FIG>, <FIG> illustrates a three-dimensional structure, taken from a view angle, of a seat adjustment module <NUM>, and <FIG> illustrates a structure of a junction between the rotary block <NUM> and the base <NUM>. As illustrated in <FIG> and <FIG>, the rotary block <NUM> is arranged to run through the base <NUM>, one end of the rotary block <NUM> is connected to the handle <NUM>, and the twistable adjustment member <NUM> is situated on an outer circumference of the handle <NUM>; and a through hole <NUM> configured to allow the second transmission rope (not illustrated) to travel through is arranged in the base <NUM>. The through hole <NUM> is extended along the first rotation direction or the second rotation direction of the rotary block <NUM>.

Referring to <FIG> and <FIG>, <FIG> illustrates a side structure of a seat adjustment module <NUM> according to an embodiment of the present disclosure, and <FIG> illustrates a sectional structure along an A-A line of <FIG>. As illustrated in <FIG> and <FIG>, one end of a second transmission rope <NUM> is secured to the second mounting recess <NUM> in the handle <NUM>, is extended to travel through the through hole <NUM> in the base <NUM>, and is led out via the second passing hole <NUM> as illustrated in <FIG> and <FIG> and is connected to the lifter switch. In response to being rotated and lifted along a direction indicated by an arrow in <FIG>, the handle <NUM> drives the second transmission rope <NUM> to move, such that the lifter switch of the seat is opened. In this way, a height of the seating member is adjusted.

Still referring to <FIG>, it should be noted that since the rotary block <NUM> is arranged to run through the base <NUM>, the twistable adjustment member <NUM> is rotatably connected to the base <NUM> and is situated on the outer circumference of the handle <NUM>, in the case of external routing, that is, the second transmission rope <NUM> is securely connected to the handle <NUM> and is routed outside the base <NUM> and the twistable adjustment member <NUM> and is connected to the lifter switch, not only neatness and aesthetics of the entire seat are affected, but also a pull force direction of the second transmission rope <NUM> fails to be conveniently controlled. As a result, it is difficult to timely and effectively open the lifter switch.

In view of the above problem, by arranging the through hole <NUM> allowing the second transmission rope <NUM> to travel through in the base <NUM>, the second transmission rope <NUM> is partially shaded and hidden, the seat adjustment module <NUM> is maintained to be neat and aesthetic. In addition, the pull force direction of the second transmission rope <NUM> is restricted, and it is ensured that the adjustment function is timely responsive. Further, by arranging the twistable adjustment member <NUM> on the outer circumference of the handle <NUM>, it is not only convenient for the user to grip the twistable adjustment member <NUM> for rotation adjustment, but also the entire structure and arrangement are optimized and the seat adjustment module <NUM> is entirely delicate and aesthetic.

To avoid the case where the lift adjustment function is enabled by mistake due to undesired pulling of the second transmission rope on the handle <NUM> when the user adjusts the forward and backward movements of the seating member or adjusts the backrest reclining angle by rotating the rotary block <NUM> via the handle <NUM>, the through hole <NUM> is extended along the rotation direction of the rotary block <NUM>, such that when the rotary block <NUM> is driven to rotate by rotating the handle <NUM> to adjust the forward and backward movements of the seating member and adjust the backrest reclining angle, the second transmission rope traveling through the through hole <NUM> is capable of swinging in the through hole <NUM> as rotation of the handle <NUM>. In this way, the second transmission rope may not be subject to undesired and excessive pulling, and thus may not result in mis-opening of the lifter switch.

With respect to the structure of the twistable adjustment member <NUM>, the present disclosure provides an example. Specifically, referring to <FIG>, a structure of the seat adjustment module according to an embodiment of the present disclosure is illustrated. As illustrated in <FIG>, a transmission structure <NUM> is circumferentially arranged on the twistable adjustment member <NUM>, and a driven wheel <NUM> is rotatably arranged on the base <NUM>. The driven wheel <NUM> is transmissively engaged with the transmission structure <NUM>, and the flexible transmission member is connected to the driven wheel <NUM>.

Specifically, the transmission structure <NUM> may be gear teeth circumferentially arranged on an outer wall of the twistable adjustment member <NUM>, the driven wheel <NUM> may be a gear, and the twistable adjustment member <NUM> is transmissively connected to the driven wheel <NUM> via the gear teeth. The transmission structure <NUM> may also be a belt engagement recess or a chain engagement recess, correspondingly the driven wheel <NUM> may be a belt wheel or a chain wheel, and the twistable adjustment member <NUM> is transmissively connected to the driven wheel <NUM> via a belt or a chain sleeved on the transmission structure <NUM>.

Referring to <FIG>, a structure of a twistable adjustment member in a seat adjustment module according to another embodiment of the present disclosure is illustrated. In the specific embodiment as illustrated in <FIG>, the transmission structure <NUM> is a rack arranged circumferentially on an inner wall of the twistable adjustment member <NUM>, and the driven wheel <NUM> is a gear <NUM> in mesh with the rack.

By circumferentially arranging the transmission structure <NUM> on the twistable adjustment member <NUM> and rotatably arranging the driven wheel <NUM> in transmissive engagement with the transmission structure <NUM> on the base <NUM>, the driven wheel <NUM> is flexibly arranged at any desired positions, such that avoidance between the driven wheel <NUM> and the rotary block <NUM> is achieved and an overall structural arrangement of the seat adjustment module <NUM> is optimized.

With respect to the structure of the flexible transmission member, the present disclosure provides an example. Specifically, still referring to <FIG> and further referring to <FIG>, <FIG> illustrates a structure of a chassis according to an embodiment of the present disclosure, <FIG> illustrates a side structure of a chassis, and <FIG> illustrates a sectional structure along a B-B line of the structure in <FIG>. As illustrated in <FIG>, the flexible transmission member includes a third transmission rope <NUM> (not illustrated in <FIG>). Two ends of the third transmission rope <NUM> are wound and secured to the driven wheel <NUM> along two opposite directions. The driven wheel <NUM> is configured to be connected to the backrest elastic force adjustment mechanism via the third transmission rope <NUM>. The twistable adjustment member <NUM> is configured to, in response to being rotated, drive, via the driven wheel <NUM> and the third transmission rope <NUM>, the backrest elastic force adjustment mechanism to move to adjust the magnitude of the elastic force of the backrest in the seat.

As illustrated in <FIG>, a first passing slot <NUM> and a second passing slot <NUM> may be arranged in an extended end portion of the driven wheel <NUM>, a first leading hole <NUM> and a second leading hole <NUM> respectively corresponding to the first passing slot <NUM> and the second passing slot <NUM> may be arranged in the base <NUM>, and two ends of the third transmission rope <NUM> are respectively led into the first leading hole <NUM> and the second leading hole <NUM> and are then wound and secured into the first passing slot <NUM> and the second passing slot <NUM>.

In combination with <FIG>, and <FIG> to <FIG>, the backrest elastic force adjustment mechanism includes an elastic sheet <NUM>, a fulcrum structure <NUM>, and a tension mechanism <NUM> (for example, a tension wheel or a tension shaft or the like in the drawings), the elastic sheet <NUM> is connected between the chassis <NUM> and the backrest and is configured to supply a support elastic force to the backrest, the fulcrum structure <NUM> is slidably arranged on the chassis <NUM> along directions indicated by arrows in the drawings, the fulcrum structure <NUM> is supported at the bottom of the elastic sheet <NUM>, and the tension mechanism <NUM> is rotatably arranged on the chassis <NUM>. A middle section of the third transmission rope <NUM> travels through the fulcrum structure <NUM> and is wound on the tension mechanism <NUM>. The third transmission rope <NUM> is securely connected to the fulcrum structure <NUM> via a fixed connection portion <NUM>. When the twistable adjustment member <NUM> is rotated, the transmission structure <NUM> on the twistable adjustment member <NUM> drives the driven wheel <NUM> to rotate, such that the driven wheel <NUM> drives the third transmission rope <NUM> to move. During movement, the third transmission rope <NUM> drives the fulcrum structure <NUM> to slide in the chassis <NUM> along the directions indicated by the arrows in the drawings, such that a support position of the fulcrum structure <NUM> on the elastic sheet <NUM> is altered and the magnitude of the elastic force of the backrest is adjusted.

With respect to the structure of the twistable adjustment member <NUM>, the present disclosure provides an example. Specifically, still referring to <FIG>, the flexible transmission member includes a flexible transmission shaft <NUM>, and the driven wheel (the gear <NUM> as illustrated in <FIG>) is configured to be connected to the backrest elastic force adjustment mechanism via the flexible transmission shaft <NUM>. The twistable adjustment member <NUM> is configured to, in response to being rotated, drive, via the gear <NUM> and the flexible transmission shaft <NUM>, the backrest elastic force adjustment mechanism to rotate to adjust the magnitude of the elastic force of the backrest in the seat.

Specifically, in the embodiment as illustrated in <FIG>, one end of the gear <NUM> is securely connected to a mounting bar <NUM>, a third mounting recess <NUM> is arranged in an end portion of the mounting bar <NUM>, one end of the flexible transmission shaft <NUM> is inserted and secured into the third mounting recess <NUM>, and another end of the flexible transmission shaft <NUM> is securely connected to the backrest elastic force adjustment mechanism. When the twistable adjustment member <NUM> is counterclockwise rotated along directions indicated by arrows in <FIG>, the rack <NUM> on the inner wall thereof drives the gear <NUM> to rotate, and thus the gear <NUM> further a torque generated by rotation to the backrest elastic force adjustment mechanism via the flexible transmission shaft <NUM>, such that the backrest elastic force adjustment mechanism is rotated. In this way, the support position (as illustrated in <FIG> and <FIG>) of the fulcrum structure <NUM> on the elastic sheet <NUM> is adjusted, and eventually the magnitude of the elastic force of the backrest is adjusted. It may be understood that in some other embodiments, the flexible transmission shaft <NUM> may also be directly securely connected to one end of the gear <NUM>.

In this way, a torque of the twistable adjustment member <NUM> is transmitted to the backrest elastic force adjustment mechanism via the flexible transmission shaft <NUM>, such that the magnitude of the elastic force of the backrest is adjusted.

In some embodiments, the flexible transmission shaft <NUM> includes a soft shaft.

The soft shaft has a small rigidity and an elasticity and is capable of freely bendable and transmissive, and is configured to couple two parts that are not in the same axis, not in the same direction or having opposite movements. By a rotation movement and torque between the two parts, the soft shaft is capable of flexibly transmitting the rotation movement and torque to any position.

By transmitting the torque between the twistable adjustment member <NUM> and the backrest elastic force adjustment mechanism, a rotation axis of the twistable adjustment member <NUM> is flexibly arranged, but also torque transmission between the twistable adjustment member <NUM> and the backrest elastic force adjustment mechanism is ensured to be stable and reliable.

It may be understood that in some other embodiments, the flexible transmission shaft may employ a universal connection shaft, and the universal connection shaft is capable of likewise changing the axial direction and transmitting the torque.

With respect to the structure of the transmission member <NUM>, the present disclosure further provides an example. Specifically, still referring to <FIG>, a stop portion <NUM> is arranged at an end of the stop block <NUM> along a slide direction (directions indicated by up-down arrows in <FIG>) thereof. The stop portion <NUM> is configured to be snap-fitted to the seating member to stop the forward and backward movements of the seating member. An abutment portion <NUM> is arranged at another end of the stop block <NUM> along the slide direction thereof. The transmission portion <NUM> is a lug arranged on a circumferential side wall of the rotary block <NUM>. The rotary block <NUM> is configured to, in response to being rotated with respect to the base <NUM> along the first rotation direction (the direction indicated by the arrow a in <FIG>), cause the lug to abut against the abutment portion <NUM> to drive the stop block <NUM> to slide, such that restrictions applied by the stop portion <NUM> on the forward and backward movements of the seating member are released.

Specifically, as illustrated in <FIG> and <FIG>, when the rotary block <NUM> is rotated along the direction indicated by the arrow a, the lug is abutted against the abutment portion <NUM> and applies a force to the abutment portion <NUM> to drive the stop block <NUM> to move downward along directions indicated by arrows in the drawings, such that the stop portion <NUM> is disengaged from the slidable position portion <NUM> on the seating member frame <NUM>. In this case, the user may move the seating member frame <NUM> along a front-rear direction to alter the position of the seat cushion.

By abutment between the lug and the abutment portion <NUM>, the rotary block <NUM> drives the stop block <NUM> to move, such that the entire structure of the seat adjustment module <NUM> is compact, and the rotary block <NUM> is quick responsive to driving the stop block <NUM> in a stable and reliable fashion.

As illustrated in <FIG>, with respect to the structure of the transmission portion <NUM>, in some other embodiments, a connection portion <NUM> may also be arranged at another end the stop block <NUM> along the slide direction (the up-down directions indicated by the arrows in <FIG>) thereof with respect to the stop portion <NUM>. The transmission member is a fourth transmission rope <NUM> connected between the connection portion <NUM> and the rotary block <NUM>. The rotary block <NUM> is configured to, in response to being rotated along the first rotation direction (the direction indicated by the arrow a in <FIG>), pull the fourth transmission rope <NUM> to move to drive the stop block <NUM> to slide, such that restrictions applied by the stop block <NUM> on the forward and backward movements of the seating member are released.

It should be noted that the same principle applies for transmitting the pull force of the transmission block <NUM> on the stop block <NUM> by the fourth transmission rope <NUM> and transmitting the pull force of the rotary block <NUM> on the backrest adjustment switch by the first transmission rope <NUM>, but directions of transmitting the forces are opposite. That is, when the rotary block <NUM> is rotated along the first rotation direction (the direction indicated by the arrow a in <FIG>), the fourth transmission rope <NUM> pulls the stop block <NUM> to slide; and when the rotary block <NUM> is rotated along a second rotation direction (a direction indicated by an arrow b in <FIG>), the first transmission rope <NUM> pulls the backrest adjustment switch to be opened.

With respect to the fashion of pulling the stop block <NUM> by the fourth transmission rope <NUM>, the rotary block <NUM> does not need to be rigidly abutted against the stop block <NUM>. Therefore, a relative position between the rotary block <NUM> and the stop block <NUM> may be flexibly adjusted, such that it is convenient to optimize the overall arrangement of the structure.

With respect to the embodiments where the transmission member <NUM> employs a lug, to prevent slide interference to the stop block <NUM> during adjusting the reclining angle of the backrest, the present disclosure further provides an example. Specifically, still referring to <FIG>, a strip-shaped opening <NUM> extending along the slide direction (the directions indicated by the up-down arrows in <FIG>) of the stop block <NUM> is arranged in the abutment portion <NUM>. The lug is configured to, in response to the rotary block <NUM> being rotated along the first rotation direction (the direction indicated by the arrow a in <FIG>) with respect to the base <NUM>, be abutted against an inner wall at one end of the strip-shaped opening <NUM> to drive the stop block <NUM> to slide. The lug is further configured to, in response to the rotary block <NUM> being rotated along the second rotation direction (the direction indicated by the arrow b in <FIG>) with respect to the base <NUM>, move in the strip-shaped opening <NUM> and be not in structural interference with the abutment portion <NUM>.

As illustrated in <FIG>, the strip-shaped opening <NUM> extending along the directions indicated by the up-down arrows in <FIG> is arranged in the abutment portion <NUM>, and when the rotary block <NUM> is rotated along the direction indicated by the arrow a, the lug is abutted against a lower end of the strip-shaped opening <NUM> to drive the stop block <NUM> to move downward, such that the forward and backward movements of the seating member are released. However, when the rotary block <NUM> is rotated along the direction indicated by the arrow b to adjust the reclining angle of the backrest, the lug may slide in the strip-shaped opening <NUM> and may not be in structural interference with the abutment portion <NUM>, such that the lug may not drive the stop block <NUM> to slide. In this way, while the function of adjusting the reclining angle of the backrest is implemented, no interference is caused to sliding of the stop block <NUM>, such that reclining angle adjustment of the backrest and forward and backward movements adjustment of the seating member are achieved independently without any mutual interference.

To save manpower of the user in adjustment by rotating the rotary block <NUM>, the present disclosure provides an example. Specifically, referring to <FIG>, an internal structure of a seat adjustment module is illustrated. As illustrated in <FIG>, a plurality of position engagement portions <NUM> are arranged on a side wall of the rotary block <NUM>, and an engagement member <NUM> is arranged on the base <NUM>. The engagement member <NUM> is configured to be engaged with different position engagement portions <NUM> in response to the rotary block <NUM> being rotated.

In the specific embodiment as illustrated in <FIG>, the position engagement portions <NUM> are arc-shaped slots arranged in the circumferential side wall of the rotary block <NUM>, and the engagement member <NUM> is an arc-shaped elastic sheet secured on the base <NUM>. By snap-fit engagement between the engagement member <NUM> and the different position engagement portions <NUM>, the rotary block <NUM> is capable of being rotated to different angles and then being secured. During the forward and backward movements adjustment of the seating member and the reclining angle adjustment of the backrest, when the user rotates the rotary block <NUM> to a corresponding angle, the engagement member <NUM> is snap-fitted to the corresponding position engagement portion <NUM>, such that the rotary block <NUM> is secured at the angle. In this case, the user does not need to apply a torque to the rotary block <NUM>, and only conduct corresponding adjustment. Upon proper adjustment, the user then reversely rotates the rotary block <NUM> to cause the rotary block <NUM> to returns its original position, and till now the adjustment of the corresponding functions is completed. Accordingly, the entire process is convenient and labor-saving, and during this process, the user does not need to continuously apply a force to the rotary block <NUM> to maintain the corresponding adjustment structure to be active.

Still referring to <FIG>, in the specific embodiment as illustrated in <FIG>, the number of position engagement portions <NUM> is three, and the three position engagement portions <NUM> are arranged along an axial direction of the rotary block <NUM>. When the rotary block <NUM> is in an initial state (that is, a state where the adjustment function is not available), the engagement member <NUM> is in snap-fit engagement with a middle position engagement portion <NUM>, such that the rotary block <NUM> is maintained at an angle to prevent the rotary block <NUM> is prevented from mis-rotation. When the rotary block <NUM> is rotated properly along the direction indicated by the arrow a in <FIG>, the engagement member <NUM> is a lowest position engagement portion <NUM> in <FIG>, such that the rotary block <NUM> is maintained at the angle and secured there. In this case, the forward and backward movements of the seating member are adjusted. When the rotary block <NUM> is rotated properly along the direction indicated by the arrow b in <FIG>, the engagement member <NUM> is an upper position engagement portion <NUM> in <FIG>, such that the rotary block <NUM> is maintained at the angle and secured there. In this case, the reclining angle of the backrest is adjusted.

Typically, the user adjusts the corresponding functions while seated in the seating member. In this case, the stop block <NUM> is in dead-lock with the position engagement portion on the seating member frame, and the rotary block <NUM> cannot be rotated. To prevent this situation, the present disclosure provides an example. Specifically, referring to <FIG>, a structure of a rotary block according to an embodiment of the present disclosure is illustrated. As illustrated in <FIG>, the rotary block <NUM> includes a first body <NUM> and a second body <NUM>. The first body <NUM> is connected between the handle <NUM> and the second body <NUM>. Referring to <FIG> and <FIG>, exploded structural views of the first body and the second body from two view angles are respectively illustrated. As illustrated in <FIG> and <FIG>, a torsional elastic member <NUM> is connected between the first body <NUM> and the second body <NUM>. The second body <NUM> is configured to drive, via the transmission member <NUM>, the stop block <NUM> to slide.

In combination with <FIG>, the torsional elastic member <NUM> may employ a torsional spring, a first stress end <NUM> of the torsional elastic member <NUM> is snap-fitted to a first engagement recess <NUM> in the first body <NUM>, and a second stress end <NUM> is snap-fitted to a second engagement recess <NUM> in the second body <NUM>. When the user is seated on the seating member, the stop block <NUM> is in dead-lock with a slidable position portion on the seating member frame. In this situation, when the user drives, via the handle <NUM>, the first body <NUM> of the rotary block <NUM> to rotate along the direction indicated by the arrow a in the drawings, the first body <NUM> is capable of being normally rotated and driving the first stress end <NUM> to rotate. In this case, the second body <NUM> cannot be rotated because the stop block <NUM> is in dead-lock with the slidable position portion on the seating member frame. Therefore, at this moment, the torsional elastic member <NUM> itself has an elastic force to resume from deformation. Afterwards, when the user moves his or her hip or leg on the seating member, dead-lock between the stop block <NUM> and the slidable position portion on the seating member frame is released, such that the second stress end <NUM> of the torsional elastic member <NUM> resumes from deformation and is rotated to drive the second body <NUM> to rotate. Hence, the second body <NUM> drives, via the transmission member <NUM>, the stop block <NUM> to slide, such that the stop block <NUM> is disengaged and from the slidable position portion on the seating member frame and dead-lock is released.

To prevent the case where when the second body <NUM> cannot be rotated, the torsional elastic member <NUM> is excessively twisted and thus damaged because the first body <NUM> is excessively rotated, the present disclosure further provides an example. Specifically, still referring to <FIG> and <FIG>, the first body <NUM> and the second body <NUM> are engaged with each other via a stop sliding block <NUM> and a stop chute <NUM>. The stop sliding block <NUM> and the stop chute <NUM> are slidably engaged with each other to restrict a maximum stroke of relative rotation between the first body <NUM> and the second body <NUM>.

Specifically, in the specific embodiment as illustrated in <FIG> and <FIG>, the stop sliding block <NUM> is arranged on the second body <NUM>, and the stop chute <NUM> is arranged in the first body <NUM>. Nevertheless, in other embodiments, the stop sliding block <NUM> is arranged on the first body <NUM>, and the stop chute <NUM> is arranged in the second body <NUM>. In the initial state (that is, a state where the adjustment function is not available), the stop sliding block <NUM> is abutted against a first abutment inner surface <NUM> of the stop chute <NUM> facing the direction indicated by the arrow b. When the reclining angle of the backrest needs to be adjusted, the first body <NUM> is rotated along the direction indicated by the arrow b in the drawings. In this case, the first abutment inner wall <NUM> directly applies a force to the stop sliding block <NUM>, such that the second body <NUM> is rotated with the first body <NUM> to hence pull the first transmission rope (not illustrated) to open the backrest adjustment switch. With respect to the case where the backrest adjustment switch is in dead-lock and the rotary block <NUM> cannot be rotated for adjustment, description has been made in the embodiment as illustrated in <FIG>. Therefore, when the first body <NUM> is rotated along the direction indicated by the arrow b in the drawings and hence drives the second body <NUM> to rotate as well for adjustment of the reclining angle of the backrest, the torsional elastic member <NUM> may not transmit a torque between the two bodies, but the stop sliding block <NUM> is directly driven to rotate via the first abutment inner wall <NUM> in the stop chute <NUM> in the first body <NUM>.

Where the second body <NUM> cannot be rotated along the direction indicated by the arrow a in the drawings due to dead-lock of the stop block <NUM>, for adjustment of the forward and backward movements of the seating member, the first body <NUM> is first rotated along the direction indicated by the arrow a. In this case, the stop chute <NUM> may be rotated with the first body <NUM> along the direction indicated by the arrow a, such that the stop sliding block <NUM> slides in the stop chute <NUM> along the direction indicated by the arrow b in the drawings with respect to the stop chute <NUM>. When the first body <NUM> is rotated to its maximum stroke, the stop sliding block <NUM> may be abutted against a second abutment inner wall <NUM> facing the direction indicated by the arrow a in the stop chute <NUM>, such that the first body <NUM> fails to continuously moving along the direction indicated by the arrow a.

The first body <NUM> and the second body <NUM> are engaged with each other via the stop sliding block <NUM> and the stop chute <NUM> to restrict the maximum stroke of relative rotation between the two bodies, such that it is ensured that the first body <NUM> is only capable of being rotated to the maximum stroke along the first rotation direction (that is, the direction indicated by the arrow a in <FIG> and <FIG>) when the second body <NUM> cannot be rotated due to dead-lock of the stop block <NUM>. In this way, the first body <NUM> may not drive the torsional elastic member <NUM> to excessively rotate. This effectively ensures that the torsional elastic member <NUM> is structurally stable, and ensures that the function of adjusting the forward and backward movements of the seating member is stably and reliably implemented.

For automatic restoration of the stop block <NUM>, in some embodiments, a restoration elastic member is arranged between the stop block <NUM> and the base <NUM>. The restoration elastic member is configured to apply a restoration elastic force to the stop block <NUM>, such that the stop block <NUM> is automatically restored and engaged with the seating member when no force supplied is applied by the rotary block <NUM>.

The restoration elastic member may employ a compressive spring, an elastic member or the like, for example, a compressive spring <NUM> as illustrated in the drawings. Specifically, referring to <FIG>, a structure of a stop block and part of a base is illustrated. In the specific embodiment as illustrated in <FIG>, an accommodation recess <NUM> is arranged in the base <NUM>. The restoration elastic member (not illustrated) is arranged in the accommodation recess <NUM>, and the restoration elastic member is abutted against both an inner wall of the accommodation recess <NUM> and the stop block <NUM>, such that the restoration elastic member supplies a restoration elastic force to the stop block <NUM> for an upward movement thereof along directions indicated by arrows in <FIG>.

Further, referring to <FIG>, a structure of a stop block is illustrated. As illustrated in <FIG>, to ensure stability of the restoration elastic member, a stop recess <NUM> may be arranged in the stop block <NUM>. One end of the restoration elastic member extends into the stop recess <NUM> and is abutted against an inner wall of the stop recess <NUM> to supply an elastic force to the stop block <NUM>. By stopping the restoration elastic member by the stop recess <NUM>, it is ensured that the restoration elastic member is placed at a current position and has a stable structure, such that the stop block <NUM> is timely and effectively restored.

According to another aspect of the embodiments of the present disclosure, a seat frame assembly is provided. Specifically, still referring to <FIG>, a seat frame assembly <NUM> includes: a frame <NUM> and the seat adjustment module <NUM> as described in any of the above embodiments.

In the seat frame assembly <NUM> according to the embodiments of the present disclosure, with the seat adjustment module <NUM> integrating a variety of functions, during use, the user may not be confused in adjustment functions, which is conducive to improving user experience. In addition, the seat adjustment module <NUM> has a compact structure and a small size, which is conducive to improving neatness and aesthetics of the seat frame assembly <NUM>.

Still referring to <FIG>, in some embodiments, the frame <NUM> includes a support frame <NUM> and a seating member frame <NUM>. The seating member frame <NUM> is slidably connected to the support frame <NUM> along a front-rear direction (directions indicated by arrows in <FIG>), and the seat adjustment module <NUM> is situated at a junction between the support frame <NUM> and the seating member frame <NUM>. Still referring to <FIG>, a slidable position portion <NUM> is arranged on the seating member frame <NUM>. The stop block <NUM> is in snap-fit engagement with the slidable position portion <NUM>.

Still referring to <FIG> and in further combination with <FIG> and <FIG>, in some embodiments, the frame <NUM> includes a backrest <NUM>, a chassis <NUM> is arranged on the support frame <NUM>, and an elastic sheet <NUM> is arranged between the chassis <NUM> and the backrest <NUM>. A fulcrum structure <NUM> is slidably arranged on the chassis <NUM>. The fulcrum structure <NUM> is abutted against the elastic sheet <NUM>, such that the elastic sheet <NUM> supplies a support elastic force to the backrest <NUM>. A rotatable adjustment member (for example, the screw <NUM> as illustrated in <FIG>) is connected to the fulcrum structure <NUM>, and the flexible transmission member includes a flexible transmission shaft (not illustrated). The flexible transmission shaft is connected to the rotatable adjustment member. The twistable adjustment member <NUM> is configured to, in response to being rotated, drive, via the flexible transmission shaft, the rotatable adjustment member to rotate, such that the fulcrum structure <NUM> slides with respect to the chassis <NUM> to alter a magnitude of the support elastic force supplied by the elastic sheet <NUM> to the backrest <NUM>.

It may be understood that the flexible transmission shaft may be directly securely connected to one end of the rotatable adjustment member (for example, the screw <NUM> as illustrated in <FIG>), or may be connected to one end of the rotation shat <NUM> as illustrated in <FIG>, and may be subsequently transmissively connected to the rotatable adjustment member by means of a bevel gear via the rotary shaft <NUM>. In this way, the flexible transmission shaft is transmissively connected to the rotatable adjustment member.

Referring to <FIG>, in some other embodiments, a tension mechanism <NUM> is arranged on the chassis <NUM>. The flexible transmission shaft includes a third transmission rope <NUM>. Two ends of the third transmission rope are wound and secured to the twistable adjustment member <NUM> along two opposite directions, and the third transmission rope <NUM> is securely connected to the fulcrum structure <NUM>. The twistable adjustment member <NUM> is configured to, in response to being rotated, drive, via the third transmission rope <NUM>, the fulcrum structure <NUM> to slide with respect to the chassis <NUM> (along directions indicated by arrows in <FIG> and <FIG>), to alter the magnitude of the support elastic force supplied by the elastic sheet <NUM> to the backrest <NUM>.

When the seat adjustment module <NUM> is arranged at the junction between the support frame <NUM> and the seating member frame <NUM>, the twistable adjustment member <NUM> is far away from the backrest elastic force adjustment mechanism, and transmission relationships are complex. Therefore, the flexible transmission shaft and the rotatable adjustment member are in transmissive engagement with each other or the third transmission rope <NUM> drives the fulcrum structure <NUM> to move, such that when the twistable adjustment member <NUM> is rotated, the fulcrum structure <NUM> is capable of being rotated, and hence the magnitude of the elastic force of the backrest is adjusted.

Still referring to <FIG>, in some embodiments, the magnitude of the elastic force of the backrest <NUM> is determined by the single elastic <NUM> arranged between the chassis <NUM> and the backrest <NUM>.

By supplying the elastic force to the backrest <NUM> using the single elastic sheet <NUM>, a suitable elastic force is ensured, and meanwhile materials are saved, and product costs are lowered.

Claim 1:
A seat adjustment module, comprising:
a base (<NUM>);
a stop block (<NUM>), slidably connected to the base (<NUM>), and configured to stop forward and backward movements of a seating member in a seat;
a rotary block (<NUM>), rotatably connected to the base (<NUM>), and configured to, in response to being rotated along a first rotation direction, drive the stop block (<NUM>) to slide by a transmission member (<NUM>) to release restrictions applied by the stop block (<NUM>) on the forward and backward movements of the seating member, wherein the rotary block (<NUM>) is further configured to, in response to being rotated along a second rotation direction, pull a first transmission rope (<NUM>) to move to open a backrestadjustment switch (<NUM>) in the seat, the second rotation direction being opposite to the first rotation direction;
a handle (<NUM>), rotatably connected to one end of the rotary block (<NUM>), and configured to, in response to being rotated with respect to the rotary block (<NUM>), pull a second transmission rope (<NUM>) to move to open a lifter switch of the seat; and
a twistable adjustment member (<NUM>), rotatably connected to the base (<NUM>), and configured to be connected to a backrest elastic force adjustment mechanism by a flexible transmission member, wherein the twistable adjustment member (<NUM>) is configured to, in response to being rotated, adjust a magnitude of an elastic force of a backrest (<NUM>) in the seat by the flexible transmission member, wherein one end of the rotary block (<NUM>) is connected to the handle (<NUM>), and the twistable adjustment member (<NUM>) is situated on an outer circumference of the handle (<NUM>);
and wherein a through hole (<NUM>) configured to allow the second transmission rope (<NUM>) to travel through is arranged in the base (<NUM>), the through hole (<NUM>) being extended along the first rotation direction or the second rotation direction of the rotary block (<NUM>), characterized in that the rotary block (<NUM>) is arranged to run through the base (<NUM>).