CN212591176U

CN212591176U - Leg adjusting bracket of comfortable chair

Info

Publication number: CN212591176U
Application number: CN202021370564.1U
Authority: CN
Inventors: 黄子源
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-10-14
Filing date: 2020-07-13
Publication date: 2021-02-26
Anticipated expiration: 2030-07-13
Also published as: CN214230617U; CN112716192A; CN214382301U; CN214072595U; CN214230619U; CN213940229U; CN213940235U; CN112716193A; CN112716190A; CN214072584U

Abstract

The utility model relates to the technical field of chair supports, in particular to a leg adjusting support of a comfortable chair, which comprises a leg bracket and a seat frame, wherein the seat frame is provided with a leg support mounting rack, the leg support mounting rack comprises a supporting rod and a leg support mounting plate, the leg support mounting plate is detachably connected with the seat frame, the front part of the leg support mounting plate is provided with a leg support connecting plate, the upper end of the leg support connecting plate is movably connected with the leg support mounting plate, the lower end of the leg support connecting plate is connected with the leg bracket, the bottom of the seat frame is provided with a driving mechanism, the driving mechanism comprises a push plate and a telescopic driving element for controlling the push plate to move back and forth, the rear end of the telescopic driving element is movably connected with the bottom of the seat frame, the output end of the telescopic driving element is connected with the front part of the push plate to push the push plate to move back and forth, the leg support is smoothly opened, is convenient to assemble and disassemble with the seat frame, and the using effect is greatly improved.

Description

Leg adjusting bracket of comfortable chair

Technical Field

The utility model relates to a chair support technical field, concretely relates to shank adjustment support of comfortable chair.

Background

The leisure and comfortable chair is a chair for enjoying leisure time or relieving fatigue, has multiple functions for adjustment, and can bring relaxation feeling and comfort feeling to human body.

The main adjusting functions of the leisure comfortable chair comprise backrest inclination angle adjustment, headrest angle adjustment, leg support (or pedal) angle adjustment and the like, the adjustment function of the leisure comfortable chair needs to depend on a support of the comfortable chair, for example, the adjustment of the leg support depends on the adjustment of a leg support, generally, the leg support is movably connected with a seat frame, a driving mechanism and the leg support are arranged at the seat frame for control, the leg support and the seat frame generally adopt a pin shaft connection mode, the operation is difficult and the convenience is not enough during production and assembly, when important, one driving mechanism can only realize the angle adjustment function of the leg support, the use effect is single, if other adjustment functions of the leg support are realized, for example, extension, a leg support extension driving mechanism is needed, the structure is complex, the production cost is increased, in addition, when the existing leg support is adjusted, poor stability and influence on the use effect.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that to above-mentioned defect, provide a shank adjustment support of comfortable chair, shank support length can change along with the rotation angle change, can not produce with ground during the shank support extension and interfere, safe and reliable, the opening of shank support is smooth-going, stable in structure, it is convenient with installing and removing of seat frame, the result of use obtains very big improvement.

The utility model provides a technical scheme that its technical problem adopted as follows:

a leg adjusting support of a comfortable chair comprises a leg bracket and a seat frame supporting the leg bracket, wherein a leg support mounting rack connected with the leg bracket is arranged on the seat frame and comprises a supporting rod and leg support mounting plates on two sides of the supporting rod, the leg support mounting plates are detachably connected with the seat frame, a leg support connecting plate is arranged at the front part of the leg support mounting plates, the upper end of the leg support connecting plate is movably connected with the leg support mounting plates, the lower end of the leg support connecting plate is connected with the leg bracket, a driving mechanism driving the leg bracket to turn forwards is arranged at the bottom of the seat frame and comprises a push plate and a telescopic driving element controlling the push plate to move forwards and backwards, the rear end of the telescopic driving element is movably connected with the bottom of the seat frame, the output end of the telescopic driving element is connected with the front part of the push plate to push the front part of the push plate to move forwards and backwards, the, the push plate moves backwards to control the leg bracket to be folded, the bottom of the seat frame is provided with a guiding and limiting mechanism for guiding and limiting the forward and backward movement of the push plate, the leg bracket is provided with a movable auxiliary bracket, the leg bracket is provided with a link mechanism for driving the auxiliary bracket to slide and open or fold along with the opening or the folding of the leg bracket, the link mechanism comprises a first connecting rod, a second connecting rod and a third connecting rod which are sequentially connected, the middle part of the second connecting rod is movably connected with the leg bracket through a pin, the upper end of the first connecting rod is movably connected with the seat frame through a first joint bearing, the lower end of the first connecting rod is connected with one end part of the second connecting rod through a second joint bearing, the upper end of the third connecting rod is movably connected with the other end of the second connecting rod, and the lower end of the third connecting.

Further, the figure of push pedal be two, two push pedal bilateral symmetry's setting is in the present frame bottom, flexible drive element be electric putter, electric putter sets up the side at one of them push pedal, the plate body of the push pedal that flexible drive element output front portion corresponds is equipped with the kink of inwards buckling, the kink makes the plate body at push pedal rear portion form the installation space that sets up flexible drive element to the inboard biasing of seat frame, the department of buckling outside of push pedal is equipped with a curb plate, the curb plate front end is connected through the plate body of the push pedal of pin and the department of buckling front side, the rear end of curb plate is connected through the plate body of the push pedal of round pin axle and the department of buckling rear side, electric putter's output is connected at the round pin axle.

Furthermore, the supporting rod is rotatably matched with the leg support mounting plate, the supporting rod is provided with a connecting plate extending towards the rear lower side, and the end part of the rear end of the connecting plate is movably connected with the front part of the push plate.

Furthermore, the leg support mounting plate is detachably connected with the seat frame through screws or bolts.

Furthermore, the direction stop gear including offer the guiding hole at push pedal rear portion, the leading wheel of seat frame bottom, the guiding hole is along push pedal moving direction's waist type hole, the leading wheel card in the guiding hole with guiding hole sliding fit, the rigidity of leading wheel, the tip contact of leading wheel and guiding hole is spacing to the back-and-forth movement stroke of push pedal.

Furthermore, the left side and the right side of the auxiliary bracket are provided with sliding grooves, and the leg bracket is provided with convex plates embedded into the sliding grooves and in sliding fit with the sliding grooves.

Furthermore, the diameter of the wheel clamped into the guide hole by the guide wheel is consistent with the width of the guide hole.

Furthermore, the front part of the seat frame is provided with a connecting bulge connected with the upper end of the first connecting rod.

The utility model has the advantages that: by adopting the scheme, the leg bracket is connected with the seat frame through the structural bolts or screws, so that the assembly production and the later maintenance are greatly facilitated, the production efficiency and the maintenance difficulty are improved, the leg bracket is driven by the three-link mechanism to slide on the leg bracket along with the overturning of the leg bracket in the overturning process, the length of the leg bracket is changed along with the change of the overturning angle, the auxiliary bracket is opened without an additional driving element, the cost is low, the three-link mechanism controls the sliding opening of the auxiliary bracket after the leg bracket is overturned to a certain angle, the opening of the auxiliary bracket is not interfered with the ground, the leg bracket is safer and more reliable, the leg bracket has the effect of automatic extension after being opened to a proper angle, the use effect is improved, the push rods on two sides are pushed, the rear parts of the push rods are limited and guided by the guide wheels at the bottom of the seat frame, and the stability of the leg bracket is greatly improved, make the upset motion of shank adjustment support more smooth and easy, the structure stability, the firmness that improve shank adjustment support have reduceed electric putter's atress greatly, can protect electric putter, prolong shank adjustment support's life.

Drawings

The foregoing and other objects, features, and advantages of the invention will be apparent from the following detailed description taken in conjunction with the accompanying drawings.

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a seat frame according to an embodiment of the present invention.

Fig. 3 is a side view of a seat frame according to an embodiment of the present invention.

FIG. 4 is a side view of a seat frame according to an embodiment of the present invention

Fig. 5 is a schematic structural view of a leg rest according to an embodiment of the present invention.

Fig. 6 is a schematic cross-sectional view of a leg rest according to an embodiment of the present invention.

Wherein: the leg support comprises a leg support 1, a first joint bearing 11, a second joint bearing 111, a convex plate 12, a sliding groove 121, a connecting protrusion 13, a seat frame 2, a supporting rod 3, a connecting block 31, a supporting plate 32, a leg support mounting plate 4, a leg support connecting plate 5, a push plate 6, a guide hole 61, an electric push rod 7, a side plate 8, a pin shaft 81, a guide wheel 9, an auxiliary support 10, a first connecting rod 101, a second connecting rod 102 and a third connecting rod 103.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in a generic and descriptive sense only and not for purposes of limitation, as the terms are used in the description to indicate that the referenced device or element must have the specified orientation, be constructed and operated in the specified orientation, and not for the purpose of limitation.

Referring to fig. 1 and 2, a leg adjusting bracket of a comfortable chair comprises a leg bracket 1 and a seat frame 2 of the leg bracket 1, wherein a leg support mounting frame connected with the leg bracket 1 is arranged on the seat frame 2, the leg support mounting frame comprises a support rod 3 and leg support mounting plates 4 arranged at two sides of the support rod 3, the leg support mounting plates 4 are detachably connected with the front end of the seat frame 2 through screws, a leg support connecting plate 5 is arranged at the front part of the leg support mounting plate 4, the upper end of the leg support connecting plate 5 is connected with the leg support mounting plate 4 through a connecting pin or a bolt, the lower end of the leg support connecting plate 5 is movably connected with the upper end side of the leg bracket 1 through a connecting pin or a screw, a plurality of screw holes are respectively arranged on the leg support mounting plates 4, a mounting structure matched with the leg support mounting plate 4 is arranged at the front part of the seat frame 2, the leg support mounting plate 4 is fixed on the seat frame through a plurality of screws, screw connection, it is with low costs, be convenient for assembly operation, the degree of difficulty of production and maintenance shank adjustment support has been reduced, the leg holds in the palm even the effect of board 5 and lies in avoiding the lug connection of leg bracket and seat frame, increase the distance between leg bracket and seat frame, leg bracket upper portion keeps certain distance with seat frame tip, this distance can reserve sufficient upset space for the upset of leg bracket, avoid leg bracket upper portion and seat frame front portion to produce when the upset and interfere, guarantee the smooth and easy nature of leg bracket upset.

The two ends of the supporting rod 3 are rotatably matched with the leg support mounting plate 4, the supporting rod 3 is a square tube, the two ends of the supporting rod 3 are sleeved with connecting blocks 31, the outer peripheral surface of each connecting block 31 is a circumferential surface, each connecting block 31 is provided with a square inner hole which is matched with the corresponding supporting rod 3 in a connected mode, the structure can realize that the supporting rod 3 can rotate freely under the condition that the leg support mounting plate is fixed, so that a leg bracket can be overturned better, referring to figures 3 and 4, the bottom of the seat frame 2 is provided with a driving mechanism for driving the leg bracket 1 to overturn forwards, the driving mechanism comprises two push plates 6 and an electric push rod 7 for controlling the push plates 6 to move forwards and backwards, the rear end of the electric push rod 7 is hinged and connected with the bottom of the seat frame 2, the two push plates 6 are symmetrically arranged on the left side and the right side of the bottom of the seat, a connecting bulge 13 extending from the rear side of the upper end of the leg bracket 1, the front end of the push plate 6 extends to the upper end of the leg bracket 1, the front end of the push plate 6 is hinged with the connecting bulge 13, the support rod 3 is provided with an arc support plate 32 extending towards the rear lower side, the support plate 32 is fixedly connected with the square support tube 3, the rear end of the support plate 3 is movably connected with the front part of the push plate 6 through a pin, the push plate 7 moves forwards and backwards, the leg bracket 1 and the support plate 32 are pushed forwards, the upper end of the support plate 32 is fixed, the support plate 32 is pushed and swung by the push plate 7 by taking the support plate as an axis, the support plate 32 is of an arc structure protruding towards the front side of the seat frame framework, the swing of the support plate causes the change of the motion state of the push plate, the front part of the push plate is changed from the forward and backwards movement to the, The leg bracket is pushed to turn forwards and open, when the push plate moves backwards, the leg bracket has a component force towards the lower side backwards, the leg bracket is pulled to better close and reset, the support plate 32 has a guiding effect on the movement of the front part of the push plate, the movement direction of the push plate can be changed in a small range, the leg bracket can be turned over more smoothly, the support plate has a guiding effect on the movement of the push plate, the action force on the push plate has a conversion effect, the support plate converts the back and forth movement of the push plate into front and back + up and down comprehensive movement, the action force of the push plate on the leg bracket can realize the turning of the leg bracket and can protect the leg bracket, the leg bracket is prevented from being damaged by jacking or pulling, and the service life of the leg adjusting support is effectively prolonged.

Referring to fig. 4, the push plate 7 moves forward and backward to push the leg bracket to turn over up and down, the electric push rod 7 is arranged at the side of one push plate 6, the front plate body of the push plate 6 is provided with a bending part bending towards the inner side of the seat frame 2, the bending part enables the plate body at the rear part of the push plate to bias towards the inner side of the seat frame to form an installation space for arranging the electric push rod, the bending part enables the push plate 6 to form a structure with a cross section in a shape like the Chinese character 'ji', referring to fig. 4, the output end of the electric push rod 7 extends to the bending part of the push plate 6, the bending part enables the push plate to be provided with the installation space for installing the electric push rod, so that the electric push rod is just matched with the push plate, in the limited transverse range of the seat frame, the space occupied by the arrangement, the front end of the side plate 8 is connected with the plate body of the push plate 6 at the front side of the bending part through a pin, the rear end of the side plate 8 is connected with the plate body of the push plate 6 at the rear side of the bending part through a pin 81, the pin 81 is parallel to the pin at the front end of the side plate 8, the pin 81 is arranged along the left and right direction of the seat frame, the output end of the electric push rod 7 is connected on the pin 81, the side plate 8, the pin at the front end of the side plate and the plate body of the push plate form a parallelogram, so that the connection between the output end of the electric push rod 7 and the push plate is stable, the side plate and the push plate are always stable in the pushing process of the electric push rod 7, the pin 81 is always vertical to the push plate, so that the pushing direction of the electric push rod is not inclined, the driving force of the electric, the leg bracket turning opening or closing device has the advantages that the leg bracket turning opening or closing is enabled to keep good stability, the stability of the leg adjusting support is improved, the using effect is good, the stability is good, the service life is prolonged, the structure is convenient to assemble and operate, the production efficiency is improved, the electric push rod 7 controls the push plate 6 to move forwards, the front end of the push plate 6 pushes the convex plate of the leg bracket, the joint of the upper end of the leg bracket 1 and the leg bracket connecting plate serves as the shaft, the lower portion of the leg bracket is turned upwards to be opened, the electric push rod pulls the push plate 6 to move backwards, and the leg bracket is turned downwards to.

In order to ensure the forward and backward movement direction of the push plate and control the forward and backward movement stroke of the push plate, the rear part of the plate body of the push plate 6 is provided with a guide hole 61 along the length direction of the plate body of the push plate, the bottom of the seat frame 2 is provided with a limiting plate extending downwards, the bottom end of the limiting plate is provided with a guide wheel 9, the guide wheel 9 is clamped into the guide hole 61, the guide hole 61 is a kidney-shaped hole along the length direction of the push plate, the guide wheel 9 is contacted with the front and rear hole ends of the guide hole 61 to limit the forward and backward movement of the push plate, the guide wheel 9 is contacted with the front side hole end of the guide hole 61 to limit the forward movement stroke of the push plate and further limit the opening angle of the leg bracket, and the guide wheel 9 is contacted with.

The cross section of the guide wheel 9 is I-shaped, the wheel diameter of the contact area between the middle part of the wheel body of the guide wheel 9 and the guide hole is consistent with the opening width of the guide hole 61, so that the guide wheel 9 is limited in the guide hole 61, and the position of the guide wheel is fixed, therefore, in the process that the push plate moves back and forth, the guide wheel slides in the guide hole to guide and limit the motion track of the push plate, so that the motion track of opening and closing of the leg bracket is smoother, the guide wheel is tightly matched with the guide hole, no matching gap exists in the longitudinal direction, the guide wheel has a supporting function on the rear side of the push plate, and the leg bracket works and is used, because the front part of the push plate is connected with the leg bracket, the electric push rod in the middle part of the push plate is connected, the push plate is stressed, the guide wheel has a supporting function on the rear, make the structure of push pedal more stable, firm, improve the anti strain ability of push pedal, the leading wheel is rotatable, and the leading wheel is little with the cooperation wearing and tearing of guiding hole, and the I shape structure of leading wheel 9 makes the leading wheel by firm chucking at the guiding hole, guarantees effectual cooperation, improves the structural stability of push pedal department.

Referring to fig. 5, a movable sub-bracket 10 is provided on a leg bracket 1, a link mechanism for driving the sub-bracket 10 to slide open or close along with the opening or closing of the leg bracket 1 is provided on the leg bracket 1, the link mechanism includes a first link 101, a second link 102, and a third link 103 connected in sequence, for reducing the weight, the leg bracket 1 and the sub-bracket 10 are both frame-shaped structures, the middle of the leg bracket 1 is provided with a connecting plate, the middle of the second link 102 is movably connected with the middle of the connecting plate on the leg bracket by a pin, the upper end of the first link 101 is movably connected with a seat frame 2 by a first joint bearing 11, a connecting protrusion connected with the first joint bearing 11 is provided at the corresponding position of the seat frame 2, the connecting protrusion fixes the position of the first joint bearing 11, the upper end of the first link is fixed, the connecting protrusion is convenient to control the position of the first joint bearing, thereby adjusting the turning state of the first link, the opening time of the sub-bracket is adjusted, the lower end of the first connecting rod 101 is connected with the right end of the second connecting rod 102 through the second joint bearing 111, the upper end of the third connecting rod 103 is movably connected with the left end of the second connecting rod 102, and the lower end of the third connecting rod 103 is hinged with the upper end of the sub-bracket 10.

The electric push rod pushes the push plate to move forwards, the push plate pushes the leg bracket to turn over and open, in the process of turning over and opening the leg bracket, because the lower end of the first connecting rod is connected with the second connecting rod fixed on the leg bracket, the first connecting rod turns over synchronously with the leg bracket, because the upper end of the first connecting rod is connected with the seat frame, the upper end of the first connecting rod is fixed, the lower end of the first connecting rod is lifted and pulled when the first connecting rod turns over, the lower end of the first connecting rod can gradually move to the upper part of the leg bracket along the leg bracket, so that the right end of the second connecting rod is pulled to move to the upper part of the leg bracket along the leg bracket, because the middle of the second connecting rod is movably connected with the leg bracket, the left end of the second connecting rod can move to the lower part of the leg bracket along the leg bracket body, and then the second connecting rod pushes the third connecting rod to move to the lower, the auxiliary bracket is pushed out from the leg bracket, the turning opening and the extension of the leg adjusting bracket are realized, the support of the leg is improved, the first connecting rod is turned gradually along with the turning of the leg bracket, the lower end of the first connecting rod is gradually lifted, the lifting degree is small, only when the first connecting rod is turned to a certain angle, namely the bottom end of the first connecting rod is lifted to a certain angle, the second pull rod can be pulled, the auxiliary bracket does not slide out at the initial turning stage of the leg bracket, the length of the leg bracket is unchanged, the auxiliary bracket can slide out after the leg bracket is opened to a certain angle, the three-connecting-rod structure has the function of adjusting the sliding-out time of the auxiliary bracket, the damage caused by the fact that the auxiliary bracket is opened to touch the ground at the initial stage of opening the leg bracket can be avoided, the leg bracket is opened more smoothly, the pedal bracket has the function of automatic extension after being opened to a proper angle, the use effect is better; the electric push rod pulls the push rod to move backwards, the push rod moves backwards to pull the leg bracket to be closed, in the process of turning and closing the leg bracket, the first connecting rod synchronously turns over and resets along the leg bracket, the lower end of the first connecting rod swings downwards, the right end of the second connecting rod is pulled to move towards the lower part of the leg bracket along the leg bracket, the left end of the second connecting rod can move towards the upper part of the leg bracket along the leg bracket frame body, then the second connecting rod pushes the third connecting rod to move towards the upper part of the leg bracket along the leg bracket frame body, and the auxiliary bracket is pulled to reset, so that the turning and closing of the leg adjusting bracket are realized, the three-connecting-rod structure consisting of the first connecting rod, the second connecting rod and the third connecting rod ensures that the auxiliary bracket does not need an additional driving part for opening, the opening and the resetting of the auxiliary bracket follow the turning of the leg bracket, compared with the prior art, the structure of the leg bracket is simplified, the manufacturing, the adjusting function of the leg support is exerted, the left end of the second connecting rod is movably connected with the upper end of the third connecting rod through a pin rod, the pin rods of the second connecting rod and the third connecting rod are sleeved with sleeves, nuts are arranged at the end parts of the two ends of the pin rod, the pin rod realizes the movable fit of the second connecting rod and the third connecting rod, the sleeves are arranged to match the distance between the third connecting rod and the second connecting rod, the second connecting rod and the third connecting rod are not in the same plane, the sleeves enable the second connecting rod and the third connecting rod to be matched with the respective states when being pulled and matched, the rod bodies of the second connecting rod and the third connecting rod are not deflected axially, the abrasion of the connecting part can be effectively reduced, the first joint bearing 11 and the second joint bearing 111 at the two ends of the first connecting rod can effectively reduce the abrasion of the connecting part, in the action process of the first connecting rod, because the first connecting rod and the second connecting rod are not in the same plane, the rod body of the first connecting rod can deflect along the self circumference, the sheet can cause the interference and abrasion of the joint of the first connecting rod and the second connecting rod and the seat frame, even damage the rod body of the first connecting rod, and the deflection of the first joint bearing 11 and the second joint bearing 111 is effectively eliminated, so that the three-connecting-rod mechanism is more smoothly matched.

Referring to fig. 6, the left and right sides of the leg bracket 1 are provided with the protruding plates 12, the two sides of the sub-bracket 10 are provided with the sliding grooves 121, and the protruding plates are embedded in the sliding grooves 121 and keep sliding fit with the sliding grooves, so that the sub-bracket slides on the leg bracket.

The above is only the preferred embodiment of the present invention, not to the limitation of the present invention in any form, all the techniques of the present invention are substantially any simple modification and equivalent changes to the above embodiments, all falling within the protection scope of the present invention.

Claims

1. A leg adjusting support of a comfortable chair comprises a leg bracket and a seat frame supporting the leg bracket, and is characterized in that a leg support mounting frame connected with the leg bracket is arranged on the seat frame and comprises a supporting rod and leg support mounting plates on two sides of the supporting rod, the leg support mounting plates are detachably connected with the seat frame, a leg support connecting plate is arranged at the front part of the leg support mounting plates, the upper end of the leg support connecting plate is movably connected with the leg support mounting plates, the lower end of the leg support connecting plate is connected with the leg bracket, a driving mechanism driving the leg bracket to turn forwards is arranged at the bottom of the seat frame and comprises a push plate and a telescopic driving element controlling the push plate to move forwards and backwards, the rear end of the telescopic driving element is movably connected with the bottom of the seat frame, the output end of the telescopic driving element is connected with the front part of the push plate to push the front and backwards and forwards movement, the front end of the push plate, the support plate is fixedly connected with the support rod, the rear end of the support plate is movably connected with the front part of the push plate, the push plate moves forwards to push the leg bracket and the support plate, the support plate swings to guide the push plate to move forwards to realize the forward overturning and opening of the leg bracket, the push plate moves backwards to pull the leg bracket to control the retraction of the leg bracket, the bottom of the seat frame is provided with a guiding and limiting mechanism for guiding and limiting the forward and backward movement of the push plate, the leg bracket is provided with a movable auxiliary bracket, the leg bracket is provided with a connecting rod mechanism for driving the auxiliary bracket to slide and open or retract along with the opening or retraction of the leg bracket, the connecting rod mechanism comprises a first connecting rod, a second connecting rod and a third connecting rod which are sequentially connected, the middle part of the second connecting rod is movably connected with the leg bracket through a pin, the upper end of the first connecting rod is movably connected with the seat frame through a first joint bearing, the lower end of the first connecting rod is connected, the lower end of the third connecting rod is movably connected with the auxiliary bracket.

2. The leg adjustment bracket of a comfortable chair according to claim 1, wherein the number of the push plates is two, the two push plates are arranged at the bottom of the seat frame in a bilateral symmetry manner, the telescopic driving element is an electric push rod, the electric push rod is arranged at the side of one of the push plates, a bending portion which is bent inwards is arranged on the plate body of the push plate corresponding to the front portion of the output end of the telescopic driving element, the bending portion enables the plate body at the rear portion of the push plate to be offset towards the inner side of the seat frame to form an installation space for the telescopic driving element, a side plate is arranged at the outer side of the bending portion of the push plate, the front end of the side plate is connected with the plate body of the push plate at the front side of the bending portion through a pin, the rear end of the side plate is connected.

3. A comfort chair leg adjustment support as claimed in claim 1, wherein the support bar is pivotally engaged with the leg rest mounting plate.

4. A leg adjustment support for a comfort chair as claimed in claim 1, wherein said leg rest mounting plate is removably attached to the seat frame by screws or bolts.

5. The leg adjusting bracket of a comfortable chair according to claim 1, wherein the guiding and limiting mechanism comprises a guiding hole formed at the rear part of the push plate and a guiding wheel arranged at the bottom of the seat frame, the guiding hole is a kidney-shaped hole along the moving direction of the push plate, the guiding wheel is clamped into the guiding hole and is in sliding fit with the guiding hole, the position of the guiding wheel is fixed, and the guiding wheel contacts with the end part of the guiding hole to limit the back-and-forth movement stroke of the push plate.

6. The leg adjustment stand of claim 1, wherein the auxiliary bracket has sliding grooves formed on both left and right sides thereof, and the leg bracket has a protruding plate inserted into the sliding grooves to be slidably engaged with the sliding grooves.

7. A leg adjustment frame for a comfort chair as claimed in claim 5, characterized in that the diameter of the wheel, which the guide wheel engages in the guide hole, corresponds to the width of the guide hole.

8. A leg adjustment bracket for a comfort chair as claimed in claim 1, wherein the front portion of the seat frame is provided with a coupling projection for coupling the upper end of the first link.