Seat frame with hidden footrest extension mechanism and multifunctional seat

Abstract

The utility model relates to a seat frame with a hidden footrest extension mechanism and a multifunctional seat, the seat frame with the hidden footrest extension mechanism comprises a machine body, a hip part, the footrest extension mechanism and a driver, the hip part is controlled and movably arranged relative to the machine body, and the driver is arranged on the machine body and connected with the footrest extension mechanism. The foot rest extension mechanism comprises a folding mechanism and a suspension supporting mechanism. The folding mechanism comprises a first folding rod set hinged to the hip part and a second folding rod set hinged to the first folding rod set and forming a variable folding angle. The suspension supporting mechanism comprises a first shelf, a second shelf, and a first flexion and extension rod group and a second flexion and extension rod group which are hinged to each other and form a variable flexion and extension angle; wherein the second folding rod group is hinged to the first shelf, the end, relatively far away from the second folding rod group, of the first bending and stretching rod group is hinged to the first shelf, the end, relatively far away from the first folding rod group, of the second folding rod group, and the end, relatively far away from the first bending and stretching rod group, of the second bending and stretching rod group is hinged to the second shelf.

Description

TECHNICAL FIELD

[0001] The utility model relates to furniture technical field especially, it is a kind of seat frame and multi-functional seat with hidden type foot rest extension mechanism. BACKGROUND

[0002] Multi-functional seat provides three kinds of using postures including sitting posture, leisure posture and lying posture, and the sitting posture, leisure posture and lying posture are respectively for user to sit down, lift leg and relax and lie down to rest. When user intends to lie down to rest, multi-functional seat first stretches foot rest device to switch from sitting posture to leisure posture, then carries out back component backward tilting movement to switch from leisure posture to lying posture, and after rest, the seat in lying posture first carries out back component to standing state reset to restore to leisure posture, then folds foot rest device to restore from leisure posture to sitting posture so that user can get up and leave seat.

[0003] In order to make user's leg be fully supported and stretched when lifting leg and relaxing and lying down, some existing multi-functional seats use leg device containing multiple shelves, each shelf is provided with shelf plate for contacting leg, and more shelf plates increase the area of foot rest device supporting leg. However, with the increase of the number of shelves and shelf plates, the activity space required for switching foot rest device between folding state and stretching state is also increased, so the height of hip part has to be increased, otherwise foot rest device is interfered by ground, and the increase of hip part height increases the difficulty of user's sitting to hip part and getting up and leaving seat. SUMMARY

[0004] Therefore, the utility model provides a kind of seat frame and multi-functional seat with hidden type foot rest extension mechanism, which provides larger leg supporting area without lifting hip part height to ensure use convenience.

[0005] The seat frame with hidden type foot rest extension mechanism of the utility model includes body, hip part, foot rest extension mechanism and driver, the hip part is movably arranged relative to the body under control, the driver is arranged on the body and connected with the foot rest extension mechanism, and the foot rest extension mechanism includes:

[0006] Folding mechanism, including first folding rod group hinged to hip part, second folding rod group hinged to first folding rod group and forming variable folding angle;

[0007] Suspension mechanism, including first shelf, second shelf, first flexion rod group and second flexion rod group hinged and connected and forming variable flexion angle;

[0008] Among them, second folding rod group is hinged to first shelf, first flexion rod group is hinged to first shelf and second folding rod group relative to the end portion away from first folding rod group, and second flexion rod group is hinged to second shelf relative to the end portion away from first flexion rod group.

[0009] In some embodiments, the suspension mechanism comprises a first flexion-extension link shared by the first and second flexion-extension link sets, the first flexion-extension link comprising a first link segment and a second link segment fixedly connected, the first and second link segments being respectively hinged to the first and second shelves.

[0010] In some embodiments, the first flexion-extension link set comprises a second flexion-extension link hinged to the second folding link set at an end opposite to the second flexion-extension link set, the first flexion-extension link further comprising a bent segment disposed between the first and second link segments and hinged to the second flexion-extension link.

[0011] In some embodiments, the second flexion-extension link set comprises a third flexion-extension link hinged to the second shelf, the second flexion-extension link comprising a third link segment and a fourth link segment fixedly connected, the third link segment being hinged to the second folding link set at an end opposite to the fourth link segment, the fourth link segment being hinged to the bent segment at one end and to an end of the third flexion-extension link opposite to the second shelf.

[0012] In some embodiments, the fourth link segment is provided with a link set joint and a shared joint at an end opposite to the third link segment and an end opposite to the third link segment respectively, the third flexion-extension link and the fourth link segment being hinged to the link set joint, the bent segment and the fourth link segment being hinged to the shared joint; and / or

[0013] The second shelf comprises a shelf connecting portion, an intermediate joint and a bottom joint disposed in sequence, the shelf connecting portion being used for connecting the second shelf, the second link segment being hinged to the intermediate joint, the third flexion-extension link being hinged to the bottom joint; and / or,

[0014] One of the second shelf and the third flexion-extension link is provided with a first limiting portion, the first limiting portion being used for stopping and limiting the other of the second shelf and the third flexion-extension link when the footrest extension mechanism is extended.

[0015] In some embodiments, the second shelf is provided with a limiting protrusion at an end opposite to the shelf connecting portion, the limiting protrusion being used for abutting against the first limiting portion, the first limiting portion being fixedly provided on the third flexion-extension link; and / or,

[0016] The first rod segment is hinged to the first shelf at a first suspension joint, the second folding rod set is hinged to the second flexion-extension connecting rod at a second suspension joint, and is hinged to the first shelf at a third suspension joint; the distance between the middle joint and the bottom joint is a, the distance between the bottom joint and the rod set joint is b, the distance between the rod set joint and the shared joint is c, the distance between the shared joint and the middle joint is d, the distance between the rod set joint and the second suspension joint is e, the distance between the second suspension joint and the first suspension joint is f, the distance between the first suspension joint and the shared joint is g, and the distance between the second suspension joint and the third suspension joint is h, and the size relationship of a, b, c, d, e, f, g, h is e>g>b>h>d>f>c>a.

[0017] In some embodiments, the variable flexion-extension angle includes a first flexion-extension angle, a second flexion-extension angle, and a third flexion-extension angle, wherein

[0018] The second rod segment and the second shelf form a first flexion-extension angle, the third flexion-extension connecting rod and the second shelf form a second flexion-extension angle, and the third rod segment and the third flexion-extension connecting rod form a third flexion-extension angle.

[0019] In some embodiments, the first folding rod set includes a first folding connecting rod and a second folding connecting rod hinged to the hip part, and the second folding rod set includes a third folding connecting rod and a fourth folding connecting rod hinged to the first shelf,

[0020] The first folding connecting rod and the third folding connecting rod are crossed and hinged, the end of the first folding connecting rod relatively far away from the hip part is hinged to the end of the fourth folding connecting rod relatively far away from the first shelf, the end of the second folding connecting rod relatively far away from the hip part is hinged to the end of the third folding connecting rod relatively far away from the first shelf, and the end of the fourth folding connecting rod relatively far away from the first folding connecting rod is hinged to the first flexion-extension rod set, and the hinge point between the fourth folding connecting rod and the first shelf is located between the two ends of the fourth folding connecting rod.

[0021] In some embodiments, the variable folding angle includes a first folding angle, a second folding angle, and a third folding angle, wherein

[0022] The first folding connecting rod and the third folding connecting rod form a first folding angle, the second folding connecting rod and the third folding connecting rod form a second folding angle, and the first folding connecting rod and the fourth folding connecting rod form a third folding angle.

[0023] The multifunctional seat of the utility model includes the seat frame with the hidden foot rest extension mechanism.

[0024] The utility model discloses on the basis of the existing seat frame adds second flexure link set, first shelf is driven by second folding link set to carry out the extension and folding, and second shelf is driven by first flexure link set and second flexure link set to carry out the extension and folding, when the seat frame with hidden type foot rest extension mechanism switches from the sitting posture to the leisure posture, second flexure link set gradually extends relative to first flexure link set and the variable flexure angle gradually changes;

[0025] In view of the setting and the variable flexure angle gradually change of second flexure link set, the activity stroke of second shelf relative to first shelf increases greatly, when the seat frame with hidden type foot rest extension mechanism is in the leisure posture, second shelf reaches farther in front of first shelf, thereby can extend first shelf plate carried on first shelf, and first shelf plate and second shelf plate carried on second shelf jointly support the leg, and the area of foot rest extension mechanism supporting the leg is increased;

[0026] Since the increase of the activity stroke of second shelf relative to first shelf does not come from the length increase of second shelf and second shelf plate, when the seat frame with hidden type foot rest extension mechanism switches the posture, second shelf and second shelf plate are not interfered by the ground, and the height of the hip part does not need to be lifted, so that the user can be seated and get up and leave the seat. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is the schematic view of the seat frame with hidden type foot rest extension mechanism in the sitting posture of one embodiment of the utility model;

[0028] Figure 2 It is the schematic view of the seat frame with hidden type foot rest extension mechanism between the sitting posture and the leisure posture of one embodiment of the utility model;

[0029] Figure 3 It is the schematic view of the seat frame with hidden type foot rest extension mechanism in the leisure posture of one embodiment of the utility model;

[0030] Figure 4 It is the perspective view of the seat frame with hidden type foot rest extension mechanism in the sitting posture of one embodiment of the utility model;

[0031] Figure 5 It is the perspective view of the seat frame with hidden type foot rest extension mechanism in the leisure posture of one embodiment of the utility model;

[0032] Figure 6 It is the partial structure schematic view of the seat frame with hidden type foot rest extension mechanism in the sitting posture of one embodiment of the utility model;

[0033] Figure 7Structure schematic view of foot rest extension mechanism of seat frame with hidden foot rest extension mechanism according to an embodiment of the present application;

[0034] Figure 8 Connection relationship schematic view of foot rest extension mechanism of seat frame with hidden foot rest extension mechanism according to an embodiment of the present application;

[0035] Figure 9 Schematic view of first flexion link of seat frame with hidden foot rest extension mechanism according to an embodiment of the present application;

[0036] Figure 10 Schematic view of second flexion link of seat frame with hidden foot rest extension mechanism according to an embodiment of the present application;

[0037] Figure 11 Schematic view of second shelf of seat frame with hidden foot rest extension mechanism according to an embodiment of the present application.

[0038] Explanation of reference numerals: 10, fuselage; 20, hip part; 301, folding mechanism; 302, suspension mechanism; 31, first flexion link; 311, first link segment; 312, second link segment; 313, bent segment; 32, second flexion link; 321, third link segment; 322, fourth link segment; 323, link group joint; 324, shared joint; 33, third flexion link; 331, first limiting part; 34, first shelf; 341, first suspension joint; 342, second suspension joint; 343, third suspension joint; 35, second shelf; 351, shelf connecting part; 352, middle joint; 353, bottom joint; 354, limiting protrusion; 36, first folding link; 37, second folding link; 371, fourth limiting part; 38, third folding link; 381, third limiting part; 39, fourth folding link; 391, second limiting part; 41, first shelf plate; 42, second shelf plate; 43, force transmission rod; 50, driver; 60, back mechanism. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. As used in this description, the singular forms "a", "an", and "the" include plural references unless the context clearly dictates otherwise. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0041] The seat frame with the hidden foot rest extension mechanism and the multifunctional seat including the same are provided. The seat frame with the hidden foot rest extension mechanism can provide at least three use states of a sitting posture, a leisure posture and a lying posture. The sitting posture is for a user to sit down with knees bent and a torso straight. The leisure posture is for the user to sit down with straight legs and a straight torso. The lying posture is for the user to lie down with straight legs and a torso lying down. The seat frame with the hidden foot rest extension mechanism is in the sitting posture as shown in Figure 1 、 Figure 4 and Figure 6 is in the leisure posture as shown in Figure 3 、 Figure 5 is in a transition posture between the sitting posture and the leisure posture as shown in Figure 2 .

[0042] Referring to Figures 2-3 、 Figures 6-7 , the seat frame with the hidden foot rest extension mechanism (hereinafter referred to as the seat frame) includes a body 10, a hip part 20, a foot rest extension mechanism, a back mechanism 60, a driver 50 and a floating support device (not numbered in the figure). The body 10 is kept fixed relative to the ground. The floating support device, the back mechanism 60 and the driver 50 are movably arranged on the body 10. The hip part 20 is movably arranged on the floating support device relative to the body 10. The foot rest extension mechanism and the back mechanism 60 are respectively rotatably connected to the front end and the rear end of the hip part 20. The floating support device and the foot rest extension mechanism are connected through a force transmission rod 43. The driver 50 is drivingly connected to the foot rest extension mechanism. The driver 50 acts on the power of the foot rest extension mechanism. The foot rest extension mechanism transmits part of the power to the floating support device through the force transmission rod 43. The floating support device drives the hip part 20 to move orderly relative to the body 10 and the ground.

[0043] The body 10 serves as a mounting base for a floating support device for guiding the hip part 20 to move orderly back and forth relative to the ground to realize the posture switching of the seat frame, a back mechanism 60 for supporting the waist and back of the user and capable of switching between an upright state and a reclining state, a footrest extension mechanism for supporting the lower leg and feet of the user, and a driver 50 serving as a power source for the seat frame to change the posture.

[0044] When the seat frame is in the lying posture, the back mechanism 60 reclines and the footrest extension mechanism is fully stretched. Figure 3 、 Figure 5 When the seat frame is in the leisure posture as shown in Figure 2 , the back mechanism 60 is upright and the footrest extension mechanism is half stretched and half folded. Figure 1 、 Figure 4 and Figure 7 When the seat frame is in the sitting posture as shown in

[0045] Referring to Figure 3 、 Figure 5 and Figure 7 , in the utility model, the footrest extension mechanism comprises a folding mechanism 301, a suspension mechanism 302, a first shelf plate 41 and a second shelf plate 42. The folding mechanism 301 comprises a first folding rod group and a second folding rod group connected by a hinge, the first folding rod group is hinged to the front end of the hip part 20, a variable folding angle is formed between the second folding mechanism 301 and the first folding mechanism 301, and the driver 50 is drivingly connected to the folding mechanism 301; the suspension mechanism 302 comprises a first shelf 34, a second shelf 35, a first flexion-extension rod group and a second flexion-extension rod group connected by a hinge, and the first shelf plate 41 and the second shelf plate 42 are respectively installed on the first shelf 34 and the second shelf 35. The first shelf 34 is used for supporting the lower leg, and the second shelf 35 is used for supporting the feet. The first flexion-extension rod group, the second flexion-extension rod group and the second shelf 35 form a variable flexion-extension angle. The second folding rod group is hinged to the first shelf 34, the first flexion-extension rod group is hinged to the first shelf 34 at the end portion away from the second flexion-extension rod group, and the second flexion-extension rod group is hinged to the second shelf 35 at the end portion away from the first flexion-extension rod group.

[0046] Specifically, referring to Figures 7-8, the first folding linkage 36 and the third folding linkage 38 are crossed and hinged at point D, the end of the first folding linkage 36 opposite to the front end of the hip part 20 is hinged to the end of the fourth folding linkage 39 opposite to the first shelf 34, point E is the hinge point between the first folding linkage 36 and the fourth folding linkage 39, the end of the second folding linkage 37 opposite to the front end of the hip part 20 is hinged to the end of the third folding linkage 38 opposite to the first shelf 34, point C is the hinge point between the second folding linkage 37 and the third folding linkage 38, the end of the fourth folding linkage 39 opposite to the first folding linkage 36 is hinged to the first flexion-extension linkage group, point I is the hinge point between the fourth folding linkage 39 and the first flexion-extension linkage group, the hinge point between the fourth folding linkage 39 and the first shelf 34 is located between the two ends of the fourth folding linkage 39.

[0047] Further, the variable folding angles include a first folding angle, a second folding angle and a third folding angle, the first folding angle is formed between the first folding linkage 36 and the third folding linkage 38, the second folding angle is formed between the second folding linkage 37 and the third folding linkage 38, and the third folding angle is formed between the first folding linkage 36 and the fourth folding linkage 39. When the seat frame is in the sitting position, the first folding angle, the second folding angle and the third folding angle are all at the minimum angle value, when the seat frame is switched from the sitting position to the leisure position, the first folding angle, the second folding angle and the third folding angle are gradually increased, and when the seat frame is in the leisure position and the lying position, the first folding angle, the second folding angle and the third folding angle are kept at the maximum angle value.

[0048] Referring to Figures 4-6 , the driver 50 is a push rod motor, including a motor body and a push rod movable relative to the motor body to extend and retract, the motor body is rotatably installed on the fuselage 10, one end of the push rod extends into the motor body, the other end extends out of the motor body and is hinged to the first folding linkage 36 or the second folding linkage 37, the push rod motor applies a pushing force to the footrest extension mechanism by increasing the length of the push rod extending out of the motor body, and applies a pulling force to the footrest extension mechanism by reducing the length of the push rod extending out of the motor body, the footrest extension mechanism gradually switches from the folding state to the stretching state under the action of the pushing force, and gradually switches from the stretching state to the folding state under the action of the pulling force. It can be understood that in other embodiments, the form of the driver 50 is not limited to the push rod motor, but also can be a rotary motor. The power output end of the driver 50 and the first folding linkage group can also be connected by other means, and the driver 50 can also drive the second folding linkage group.

[0049] Further, the suspension mechanism 302 comprises a first flexion-extension link 31 shared by the first flexion-extension link group and the second flexion-extension link group, referring to Figures 2-3 , Figures 7-9 , the first flexion-extension link 31 comprises a first link segment 311 and a second link segment 312 fixedly connected, the first link segment 311 belongs to the first flexion-extension link group, and the end of the first link segment 311 relatively far away from the second link segment 312 is hinged to a first shelf 34 at a point J shown in Figure 8 , the second link segment 312 belongs to the second flexion-extension link group, and the end of the second link segment 312 relatively far away from the first link segment 311 is hinged to a second shelf 35 at a point N shown in Figure 8 .

[0050] The first flexion-extension link group further comprises a second flexion-extension link 32 hinged to the second folding link group at an end relatively far away from the second flexion-extension link group, and the first flexion-extension link 31 further comprises a bent segment 313 fixedly connected between the first link segment 311 and the second link segment 312, and the bent segment 313 is hinged to the second flexion-extension link 32. Referring to Figure 10 , the second flexion-extension link 32 comprises a third link segment 321 and a fourth link segment 322 fixedly connected and bent, the third link segment 321 is hinged to an end of the fourth folding link 39 relatively far away from the first folding link 36, and the hinged point of the third link segment 321 and the fourth folding link 39 is represented by a point I in Figure 8 . The fourth link segment 322 is hinged to the bent segment 313 at an end relatively far away from the third link segment 321, and the hinged point of the fourth link segment 322 and the bent segment 313 is represented by a point L in Figure 8 .

[0051] Further, the second flexion-extension link group further comprises a third flexion-extension link 33 hinged to the second shelf 35, the hinged point between the third flexion-extension link 33 and the second shelf 35 is represented by a point M in Figure 8 , one end of the fourth link segment 322 connected to the third link segment 321 is hinged to an end of the third flexion-extension link 33 relatively far away from the second shelf 35, and the hinged point between the fourth link segment 322 and the third flexion-extension link 33 is represented by a point K in Figure 8 . Referring to Figure 10 , the other end of the fourth link segment 322 relatively close to the third link segment 321 and the other end relatively far away from the third link segment 321 are respectively provided with a link group joint 323 and a shared joint 324, the third flexion-extension link 33 is hinged to the link group joint 323, and the bent segment 313 is hinged to the shared joint 324. Referring to Figure 11 , the second shelf 35 comprises a shelf connecting portion 351, an intermediate joint 352 and a bottom joint 353 arranged in sequence, the second shelf 42 is installed on the shelf connecting portion 351, the second link segment 312 is hinged to the intermediate joint 352, and the third flexion-extension link 33 is hinged to the bottom joint 353.

[0052] Referring to Figure 7 , the first rod segment 311 is hinged to the first shelf 34 at a first suspension joint 341, the third rod segment 321 is hinged to the second suspension joint 342 of the fourth folding link 39, the fourth folding link 39 is hinged to the third suspension joint 343 of the first shelf 34, the distance between the intermediate joint 352 and the bottom joint 353 is denoted as a, the distance between the bottom joint 353 and the rod group joint 323 is denoted as b, the distance between the rod group joint 323 and the shared joint 324 is denoted as c, the distance between the shared joint 324 and the intermediate joint 352 is denoted as d, the distance between the rod group joint 323 and the second suspension joint 342 is denoted as e, the distance between the second suspension joint 342 and the first suspension joint 341 is denoted as f, the distance between the first suspension joint 341 and the shared joint 324 is denoted as g, the distance between the second suspension joint 342 and the third suspension joint 343 is denoted as h, e>g>b>h>d>f>c>a.

[0053] Referring to Figures 7-8 , the second rod segment 312, the second shelf 35, the third flexion-extension link 33 and the fourth rod segment 322 form a four-bar linkage, which is represented by a NMKL four-point linkage in Figure 8 ; the first shelf 34, the first rod segment 311, the second flexion-extension link 32 and the fourth folding link 39 form a four-bar linkage, which is represented by a JLFI four-point linkage in Figure 8 ; the hip part 20, the first folding link 36, the second folding link 37 and the third folding link 38 form a four-bar linkage, which is represented by an ABCD four-point linkage in Figure 8 ; the first folding link 36, the third folding link 38, the fourth folding link 39 and the first shelf 34 form a four-bar linkage, which is represented by an FGDE four-point linkage in Figure 8 .

[0054] Further, the variable flexion-extension angles include a first flexion-extension angle, a second flexion-extension angle and a third flexion-extension angle, the first flexion-extension angle is formed between the second rod segment 312 and the second shelf 35, the second flexion-extension angle is formed between the third flexion-extension link 33 and the second shelf 35, and the third flexion-extension angle is formed between the third rod segment 321 and the third flexion-extension link 33. When the seat frame is switched from the sitting position to the leisure position, the first flexion-extension angle and the second flexion-extension angle gradually increase as the footrest extension mechanism deforms, and the third flexion-extension angle gradually decreases as the footrest extension mechanism deforms.

[0055] Referring to Figure 1When the seat frame is in a sitting position, the first folding angle, the second folding angle and the third folding angle are all at their respective minimum angle values, and the first folding rod group and the second folding rod group are fully retracted; the second shelf 35 and the second rod segment 312 are fully retracted, the second shelf 35 and the third flexion-extension link 33 are fully retracted, and the third rod segment 321 and the third flexion-extension link 33 are fully extended. The first flexion-extension angle and the second flexion-extension angle are all at their respective minimum angle values ​​and both are acute angles. The third flexion-extension angle is at its maximum angle value and is greater than 180°. Optionally, when the seat frame is in a sitting position, the first shelf 41 and the second shelf 42 are both vertically arranged, and the second shelf 35 and the second shelf 42 are suspended relative to the ground at this time, and the ground is Figure 1 In the figure, it is represented by a horizontal straight line H. The side of the first shelf 41 supporting the calf and the side of the second shelf 42 supporting the feet are both arranged forward.

[0056] Optionally, when the seat frame is in a sitting position, as Figure 1 、 Figure 4 and Figure 6 As shown, all components of the footrest extension mechanism except the first shelf 41 are hidden in the space behind the first shelf 41 and below the buttocks member 20.

[0057] See Figure 2 When the seat frame is in the transitional position between the sitting position and the leisure position, the first folding angle, the second folding angle and the third folding angle are all compared with Figure 1 The state shown is enlarged, the first folding rod group and the second folding rod group are half folded and half extended; the second shelf 35 is extended relative to the second rod segment 312, the second shelf 35 is extended relative to the third flexion and extension link 33, and the third flexion and extension link 33 is slightly rotated relative to the third rod segment 321. The first flexion and extension angles and the second flexion and extension angles are both larger than those in FIG. Figure 1 The state shown is increased, and the third flexion and extension angle is compared with Figure 1 The state shown is reduced but still greater than 180°. Figure 2 In the transition posture shown, the first shelf 41 and the second shelf 42 are both inclined relative to the ground. Figure 2 In the figure, a horizontal straight line H is used to represent that the first shelf 41 supports one side of the calf and the second shelf 42 supports one side of both feet and is arranged forward and upward. The second shelf 35 just passes over the ground without contacting the ground at this time.

[0058] See Figure 3 When the seat frame is in the leisure position, the first folding angle, the second folding angle and the third folding angle are all at their respective maximum angle values, the first folding rod group and the second folding rod group are fully extended; the second shelf 35 and the second rod segment 312 are fully extended, the second shelf 35 and the third flexion-extension link 33 are fully extended, and the third flexion-extension link 33 is relative to the third rod segment 321.Figure 2 Further slight rotation on the basis of the state shown, the first flexion angle, the second flexion angle are at their maximum angle values, the third flexion angle is at its minimum angle value and at this time the third flexion angle is an obtuse angle with the opening upward. Alternatively, when the seat frame is in the leisure posture, the first shelf 41 and the second shelf 42 are both horizontally arranged, the second shelf 35 is located in front of the first shelf 34 horizontally, and the second shelf 42 is located in front of the first shelf 41 horizontally. The side of the first shelf 41 supporting the shank and the side of the second shelf 42 supporting the feet are both horizontally extended and vertically upward arranged.

[0059] It can be seen that, in Figures 1-11 In the seat frame shown, the first shelf 34 makes a composite motion of translation and rotation relative to the ground, and the rotation angle of the first shelf 34 is 90°. The second shelf 35 makes a composite motion of translation and rotation relative to the first shelf 34, and the rotation angle of the second shelf 35 is 90°. Compared with the prior art in which the second shelf 35 is directly hinged to the first shelf 34 and the second shelf 35 only rotates relative to the first shelf 34, the seat frame of the present application increases the travel of the second shelf 35 relative to the first shelf 34, and most of the travel of the second shelf 35 relative to the first shelf 34 occurs Figure 2 to the state shown in Figure 3 During the switching process from the state shown in Figure 1 to the state shown in Figure 2 The second shelf 35 only makes a small amplitude movement relative to the first shelf 34. When the seat frame is in the state shown in Figure 2 , the member in the footrest extension mechanism closest to the ground is the second shelf 35, and at this time the distance from the second shelf 35 to the ground is the smallest, that is, when the seat frame switches from the state shown in Figure 1 to the state shown in Figure 2 , the second shelf 35 gradually approaches the ground, and when the seat frame switches from the state shown in Figure 2 to the state shown in Figure 3 , the second shelf 35 gradually moves away from the ground. Finally, when the seat frame is in the leisure posture shown in Figure 3 , the second shelf 35 is parked further forward of the first shelf 34, so the first shelf 41 can be extended forward from the front end of the first shelf 41 to achieve a longer first shelf 41 on the first shelf 34, and the larger first shelf 41 and the second shelf 42 together support the user's shank and feet. Thanks to the increase in the travel of the second shelf 35 relative to the first shelf 34 coming from the driving of the second flexion rod set and the change in the variable flexion angle, rather than from directly lengthening the second shelf 35, even if the seat frame is in the state shown in Figure 2In the state shown, the second shelf 35 is still suspended relative to the ground. Therefore, when the seat frame switches positions, the second shelf 35 and the second shelf 42 will not be interfered with by the ground. Therefore, there is no need to lift the hip member 20 to make the second shelf 35 avoid the ground, which makes it easier for users to sit down and get up from the multifunctional chair. In contrast, existing similar products increase the movable range of the second shelf 35 and the second shelf 42 relative to the first shelf 34 by extending the second shelf 35, so that the second shelf 35 eventually reaches farther in front of the first shelf 34. Obviously, the existing technology requires raising the height of the hip member 20 to prevent the second shelf 35 from being interfered with by the ground. The raised hip member 20 affects the stability of the user during use and makes it difficult for the user to sit down and get up from the multifunctional chair.

[0060] Further, see Figure 7 and Figure 11 , one of the second shelf 35 and the third flexion-extension link 33 is provided with a first limiting portion 331, which is used to stop and limit the other of the second shelf 35 and the third flexion-extension link 33 when the footrest extension mechanism is switched to the extended state. Specifically, the second shelf 35 is bent at one end relatively away from the shelf connection portion 351 to form a limiting protrusion 354, and the first limiting portion 331 is fixed to the third flexion-extension link 33. When the footrest extension mechanism is switched to the extended state, the first limiting portion 331 is used to stop and limit the other of the second shelf 35 and the third flexion-extension link 33. Figure 7 When the seat frame is in the extended state shown in FIG1 and is switched to the leisure position and the lying position, the limiting protrusion 354 is fixedly abutted against the first limiting portion 331. The fourth folding link 39 is fixed with the second limiting portion 391, the third folding link 38 is fixed with the third limiting portion 381, and the second folding link 37 is fixed with the fourth limiting portion 371. Figure 1 In the sitting position shown, the second limiting portion 391 is fixedly abutted against the third rod section 321, and the fourth limiting portion 371 is fixedly abutted against the fourth folding link 39; when the seat frame is in Figure 3 In the leisure posture shown, the third limiting portion 381 is fixedly abutted against the first folding link 36 .

[0061] The various technical features of the above-described embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the various technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] Those skilled in the art should recognize that the above embodiments are merely intended to illustrate the present invention and are not intended to limit the present invention. As long as they are within the spirit of the present invention, appropriate changes and modifications to the above embodiments fall within the scope of protection claimed by the present invention.

Claims

1. A seat frame with a hidden footrest extension mechanism, characterized in that: The invention comprises a body (10), a hip member (20), a footrest extension mechanism and a driver (50), wherein the hip member (20) is controllably movable relative to the body (10), the driver (50) is provided on the body (10) and connected to the footrest extension mechanism, and the footrest extension mechanism comprises: A folding mechanism (301) comprises a first folding rod group hinged to the hip member (20), and a second folding rod group hinged to the first folding rod group and forming a variable folding angle; The suspension mechanism (302) includes a first shelf (34), a second shelf (35), a first flexion-extension rod group and a second flexion-extension rod group that are hingedly connected and form a variable flexion-extension angle; The second folding rod group is hinged to the first shelf (34), the end of the first flexion-extension rod group relatively away from the second flexion-extension rod group is hinged to the first shelf (34) and the end of the second folding rod group relatively away from the first folding rod group is hinged to the second shelf (35).

2. The seat frame with a hidden footrest extension mechanism according to claim 1, characterized in that: The suspension mechanism (302) includes a first flexion-extension link (31) shared by the first flexion-extension rod group and the second flexion-extension rod group, the first flexion-extension link (31) includes a first rod segment (311) and a second rod segment (312) that are fixedly connected, and the first rod segment (311) and the second rod segment (312) are hinged to the first shelf (34) and the second shelf (35) respectively.

3. The seat frame with a hidden footrest extension mechanism according to claim 2, characterized in that: The first flexion-extension rod group includes a second flexion-extension link (32), one end of the second flexion-extension link (32) relatively away from the second flexion-extension rod group is hinged to the second folding rod group, and the first flexion-extension link (31) also includes a bending section (313) arranged between the first rod section (311) and the second rod section (312) and hinged to the second flexion-extension link (32).

4. The seat frame with a hidden footrest extension mechanism according to claim 3, characterized in that: The second flexion-extension rod group includes a third flexion-extension link (33) hinged to the second shelf (35); the second flexion-extension link (32) includes a third rod segment (321) and a fourth rod segment (322) connected in a bent manner; one end of the third rod segment (321) relatively away from the fourth rod segment (322) is hinged to the second folding rod group; one end of the fourth rod segment (322) is hinged to the bending segment (313), and the other end is hinged to the end of the third flexion-extension link (33) relatively away from the second shelf (35).

5. The seat frame with a hidden footrest extension mechanism according to claim 4, characterized in that: The fourth rod segment (322) is provided with a rod group joint (323) and a shared joint (324) at one end relatively close to the third rod segment (321) and at one end relatively far from the third rod segment (321), respectively; the third flexion-extension link (33) is hinged to the rod group joint (323); and the bending segment (313) is hinged to the shared joint (324); and / or The second shelf (35) includes a shelf connecting portion (351), a middle connection point (352) and a bottom connection point (353) arranged in sequence, the second rod segment (312) is hinged to the middle connection point (352), and the third flexion-extension connecting rod (33) is hinged to the bottom connection point (353); and / or, One of the second shelf (35) and the third flexion-extension link (33) is provided with a first limiting portion (331), and the first limiting portion (331) is used to stop and limit the other of the second shelf (35) and the third flexion-extension link (33) when the footrest extension mechanism is extended.

6. The seat frame with a hidden footrest extension mechanism according to claim 5, characterized in that: The second shelf (35) is bent at one end relatively away from the shelf connecting portion (351) to provide a limiting protrusion (354) for abutting against the first limiting portion (331), and the first limiting portion (331) is fixed to the third flexion-extension connecting rod (33); and / or, The first rod section (311) and the first shelf (34) are hinged at a first suspension joint (341), the second folding rod group and the second flexion-extension link (32) are hinged at a second suspension joint (342), and are hinged to the first shelf (34) at a third suspension joint (343); the distance between the middle joint (352) and the bottom joint (353) is a, the distance between the bottom joint (353) and the rod group joint (323) is b, and the distance between the rod group joint (323) and the shared joint (323) is 4) is c, the distance between the shared contact (324) and the middle contact (352) is d, the distance between the rod group contact (323) and the second suspension contact (342) is e, the distance between the second suspension contact (342) and the first suspension contact (341) is f, the distance between the first suspension contact (341) and the shared contact (324) is g, and the distance between the second suspension contact (342) and the third suspension contact (343) is h, e>g>b>h>d>f>c>a.

7. The seat frame with a hidden footrest extension mechanism according to any one of claims 4 to 6, characterized in that: The variable flexion and extension angles include a first flexion and extension angle, a second flexion and extension angle, and a third flexion and extension angle. The first flexion-extension angle is formed between the second rod section (312) and the second shelf (35), the second flexion-extension angle is formed between the third flexion-extension connecting rod (33) and the second shelf (35), and the third flexion-extension angle is formed between the third rod section (321) and the third flexion-extension connecting rod (33); The first flexion and extension angles and the second flexion and extension angles are configured to increase as the seat frame with a hidden footrest extension mechanism switches from a sitting position to a leisure position, and the third flexion and extension angle is configured to decrease as the seat frame with a hidden footrest extension mechanism switches from a sitting position to a leisure position.

8. The seat frame with a hidden footrest extension mechanism according to claim 1, wherein: The first folding rod group includes a first folding link (36) and a second folding link (37) hinged to the hip member (20), and the second folding rod group includes a third folding link (38) and a fourth folding link (39) hinged to the first shelf (34). The first folding link (36) and the third folding link (38) are intersected and hinged, the end of the first folding link (36) relatively away from the buttocks member (20) is hinged to the end of the fourth folding link (39) relatively away from the first shelf (34), the end of the second folding link (37) relatively away from the buttocks member (20) is hinged to the end of the third folding link (38) relatively away from the first shelf (34), the end of the fourth folding link (39) relatively away from the first folding link (36) is hinged to the first flexion and extension rod group, and the hinge point between the fourth folding link (39) and the first shelf (34) is located between the two ends of the fourth folding link (39).

9. The seat frame with a hidden footrest extension mechanism according to claim 8, characterized in that: The variable folding angle includes a first folding angle, a second folding angle and a third folding angle. The first folding angle is formed between the first folding link (36) and the third folding link (38), the second folding angle is formed between the second folding link (37) and the third folding link (38), and the third folding angle is formed between the first folding link (36) and the fourth folding link (39).

10. A multifunctional seat, characterized in that: The invention comprises a seat frame with a hidden footrest extension mechanism as claimed in any one of claims 1 to 9.

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