CN213464441U - Chair frame with foot rest - Google Patents

Abstract

The utility model discloses a chair frame with a footrest, which comprises a chair seat frame, a lower chair back frame and an upper chair back frame, wherein the lower chair back frame is rotatably arranged on the chair seat frame so that the lower chair back frame can tilt forwards and backwards relative to the chair seat frame; the second driving mechanism is used for driving the footrest assembly to rotate so as to lift and put down the footrest assembly; through this technical scheme lower back of the chair frame can be for seat frame backward tilt to in-process and the linkage of last back of the chair frame of leaning on, make and go up back of the chair frame and can be for the automatic lifting of lower back of the chair frame, and still have the footrest, and then bring more comfortable impression for the user.

Description

Chair frame with foot rest

Technical Field

The invention relates to the technical field of living homes, in particular to a chair frame with a footrest.

Background

The structural design of chairs generally attaches importance to ergonomics and comfort, but most of common chairs emphasize the structural design of back support, and neglect the structural design of head and neck support.

Generally, the back of a chair with a headrest can tilt backwards, but the backrest on the chair generally utilizes a bracket to fix the headrest on the chair back, so that a user can lean the head and neck backwards to relax the muscles of the shoulder and the neck when sitting; for example, chinese patent publication No. CN209694604U discloses a seat, comprising: a lower support part for supporting the buttocks of the human body; one end of the corner connector is connected with the lower supporting part; the back support part is arranged above the lower support part and is connected with the other end of the corner connector, the back support part rotates by taking the connecting position of the back support part and the corner connector as a rotating point, and the back support part is used for supporting the back of a human body; the counterforce part is connected with the corner brace and the back support part, and provides counterforce relative to the rotating direction of the back support part when the back support part rotates; the waist pillow part is arranged above the lower supporting part and is connected with the back supporting part, the waist pillow part is driven by the back supporting part to rotate, and the waist pillow part is used for supporting the waist of the human body; and the headrest part is arranged above the back support part and is connected with the other end of the corner brace, and the headrest part is used for supporting the head of a human body. The utility model discloses a back supporting part of seat can rotate round the rotation point, and when making the people incline and face upward, the human back of laminating that back supporting part can be fine increases the comfort.

But those skilled in the art find during use: the requirement of a user for a headrest can change along with the change of the tilting angle, when the backrest does not tilt backwards, the requirement of the headrest on the headrest is smaller due to the fact that the head and neck of the user is supported by the back, at the moment, the headrest only needs to slightly protrude relative to the backrest, but along with the increase of the backward tilting angle of the backrest, the requirement of the user for the headrest is continuously increased, particularly when the tilting angle of the backrest reaches the maximum, the user needs to protrude the headrest enough relative to the backrest, and the existing headrest design is unfortunately not considered at all.

Disclosure of Invention

In order to solve the above problems, an object of the present invention is to provide a chair frame with a footrest, which includes a chair seat frame, a lower back-of-chair frame and an upper back-of-chair frame, wherein the lower back-of-chair frame can tilt backward relative to the chair seat frame and is linked with the upper back-of-chair frame during tilting, so that the upper back-of-chair frame can be automatically lifted relative to the lower back-of-chair frame, and the chair frame further has a footrest to provide a more comfortable feeling to a user.

In order to achieve the purpose, the invention adopts the following technical scheme:

a chair frame with a footrest comprises a chair seat frame, a chair back frame and a headrest frame, wherein the chair back frame is rotatably arranged on the chair seat frame so that the chair back frame can tilt forwards and backwards relative to the chair seat frame, the headrest frame is arranged on the chair back frame, and the chair frame is characterized in that,

the chair back frame comprises a lower chair back frame and an upper chair back frame, the lower chair back frame is hinged with the chair seat frame, and the lower chair back frame is hinged with the upper chair back frame; the headrest frame is arranged above the upper chair back frame,

also provided with a first electric push rod, a foot rest component and a second driving mechanism, wherein one end of the first electric push rod is rotatably arranged on the lower back-of-chair frame, the other end of the first electric push rod is rotatably arranged on the chair seat frame, the second driving mechanism is arranged on the chair seat frame,

the first electric push rod is used for driving the lower backrest frame to tilt relative to the seat frame;

the second driving mechanism is used for driving the footrest assembly to rotate so as to lift and put down the footrest assembly.

Preferably, the device is further provided with a left first limiting part and a right first limiting part and a left second limiting part and a right second limiting part;

the first limiting piece is fixedly connected with the upper backrest frame or integrally formed with the upper backrest frame, and the second limiting piece is fixedly connected with the lower backrest frame or integrally formed with the lower backrest frame; or, the first limiting piece is fixedly connected with or integrally formed with the lower back-rest frame, and the second limiting piece is fixedly connected with or integrally formed with the upper back-rest frame;

the first limiting piece is matched with the second limiting piece to limit the upper chair back frame to rotate backwards.

Preferably, the chair back frame is provided with a left connecting rod device and a right connecting rod device, the left connecting rod device and the right connecting rod device are respectively arranged on the left side and the right side of the chair back frame, the first connecting rod device comprises a first connecting rod, a first fixing plate and a second connecting rod, the first fixing plate is fixedly installed on one side of the chair seat frame, the lower chair back frame is hinged to the rear half portion of the first fixing plate, one end of the first connecting rod is hinged to the front half portion of the first fixing plate, the other end of the first connecting rod is hinged to one end of the second.

Preferably, the angle of the backward rotation of the lower back frame is greater than the angle of the backward rotation of the upper back frame during the backward rotation of the lower back frame from the initial position to the maximum rotatable position.

Preferably, the left side and the right side of the lower back frame are both provided with first positioning holes, the first limiting member is a columnar structure integrally formed with the upper back frame, the second limiting member is a block structure formed by upward extending the upper end of the lower back frame, and when the first limiting member abuts against the second limiting member, the included angle between the upper back frame and the lower back frame is 100 degrees and 180 degrees.

Preferably, the footrest assembly comprises a first footrest and a second footrest, the first footrest is mounted on the chair seat frame through two second rotation shafts which are bilaterally symmetrical and horizontally arranged, the first footrest rotates by taking the second rotation shafts as a rotation center shaft, the second rotation shafts are fixedly connected with the chair seat frame, and the second footrest is slidably mounted on the first footrest.

Preferably, the second driving mechanism comprises a second electric push rod, a second linkage rod, a third link mechanism, a linkage assembly and a left and a right sets of second link mechanisms, the second link mechanisms are arranged on the chair seat frame and the footrest assembly, the third link mechanism is arranged on the footrest assembly, the linkage assembly is rotatably arranged on the chair seat frame and is connected with the third link mechanism, the second linkage rod is fixedly connected with the second link mechanism or integrally formed with the second link mechanism, the rear end of the second electric push rod is hinged with the chair seat frame, the front end of the second electric push rod is hinged with the second linkage rod, and when the second electric push rod extends, the footrest assembly is lifted through the second link mechanism, and in the process of lifting the footrest assembly, the third link mechanism is simultaneously driven by the linkage assembly to operate so as to extend the footrest assembly; when the second electric push rod is shortened, the footrest component is put down through the second link mechanism, and in the process of putting down the footrest component, the third link mechanism is driven to operate through the linkage component so as to shorten the footrest component;

the second connecting rod mechanism comprises a fifth connecting rod and a sixth connecting rod, the fifth connecting rod is rotatably arranged on the side surface of the chair seat frame, one end of the fifth connecting rod is hinged with one end of the sixth connecting rod, and the other end of the sixth connecting rod is rotatably arranged on the side surface of the footrest assembly; two ends of the second linkage rod are fixedly connected with the left fifth connecting rod and the right fifth connecting rod or are integrally formed;

the third link mechanism comprises an eighth connecting rod and a ninth connecting rod, the eighth connecting rod is rotatably installed on the first footrest, the rear end of the eighth connecting rod is in transmission connection with the other end of the linkage assembly, the front end of the eighth connecting rod is hinged to the rear end of the ninth connecting rod, and the front end of the ninth connecting rod is rotatably installed on the second footrest.

Preferably, the linkage assembly comprises a sixth mounting plate, a fourth rotating shaft, a fourth connecting rod and a connecting piece, the sixth mounting plate is fixedly connected with the chair seat frame or integrally formed, the fourth rotating shaft is transversely mounted on the sixth mounting plate and located behind the second rotating shaft, one end of the fourth connecting rod is hinged to the sixth mounting plate through the fourth rotating shaft, the other end of the fourth connecting rod is hinged or fixedly connected with the connecting piece, and the connecting piece is hinged to the eighth connecting rod.

Preferably, the connecting piece is an L-shaped block and comprises a horizontal plate and a vertical plate, the fourth connecting rod is of a plate-shaped structure and is hinged with the vertical plate of the connecting piece, and the horizontal plate of the connecting piece is hinged with the eighth connecting rod; further preferably, the connecting rod is further provided with a joint bearing, the joint bearing is arranged on the fourth rotating shaft, and one end of the fourth connecting rod is sleeved on the joint bearing.

Preferably, the connecting piece is a joint bearing, the fourth connecting rod is of a rod-shaped structure, the fourth connecting rod is fixedly connected with one end of the connecting piece, and the other end of the connecting piece is sleeved on the third rotating shaft.

The invention has the beneficial effects that: through this technical scheme can make lower back of the chair frame still can drive the upper back of the chair frame forward rotation at the in-process that leans back to face upward, when lower back of the chair frame did not lean back to face upward promptly, the upper back of the chair frame flushes or protrudes slightly in lower back of the chair frame with lower back of the chair frame, when lower back of the chair frame leaned on maximum angle, the upper back of the chair frame just rotated certain angle forward for lower back of the chair frame, and headrest frame fixed mounting just can enlarge headrest frame protrusion distance in lower back of the chair frame on the upper portion of upper back of the chair frame, and then satisfied the user when being in different angles of inclining to lower back of the chair frame different demands to headrest frame, bring more comfortable impression for the user.

Drawings

FIG. 1 is a first schematic view of a chair frame according to an embodiment of the present invention (the lower backrest frame is not tilted);

FIG. 2 is a side view of FIG. 3;

fig. 3 is a schematic structural view of a first chair frame according to an embodiment of the invention (the lower back frame tilts to a maximum angle);

FIG. 4 is a side view of FIG. 4;

FIG. 5 is a schematic structural view of a chair frame according to a third embodiment of the present invention (the lower backrest frame is tilted to a maximum angle);

FIG. 6 is a schematic view of the hinged position of the lower back frame and the upper back frame;

FIG. 7 is an enlarged view of a portion of FIG. 5 at I;

FIG. 8 is a schematic view of the construction of the linkage arrangement of the present invention;

FIG. 9 is a schematic view of the first link of the present invention;

FIG. 10 is a schematic view of the mounting structure of the first fixing plate of the present invention;

fig. 11 is a schematic view of another attachment of a fourth link and link according to the present invention.

Description of reference numerals: 1. a chair leg frame; 5. a link means; 2. a chair seat frame; 3. a lower back-of-chair frame; 33. a second fixing plate; 4. an upper backrest frame; 50. a first link; 51. a first fixing plate; 52. a second link; 41. a first limit piece; 31. a second limiting member; 12. a third limiting member; 501. a first stage; 502. a second stage; 503. a third stage; 32. a first positioning hole; 42. a second positioning hole; 53. a third fixing plate; 54. a fastener; 55. a chute member; 541. an extension portion; 510. a third positioning hole; 12. a first electric push rod; 6. a footrest assembly; 13. a second electric push rod; 62. a sixth link; 63. a first footrest; 64. a second footrest; 14. a second rotating shaft; 65. an eighth link; 66. a ninth link; 16. a third rotating shaft; 80. a sixth mounting plate; 84. a fourth rotating shaft; 82. a fourth link; 83. a connecting member.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The first embodiment is as follows:

in the present embodiment, as shown in fig. 1 to 5, a chair frame with a footrest comprises a footrest 1, a chair seat support rod, a chair seat frame 2, a footrest assembly 6, a chair back frame and a headrest frame, wherein the footrest 1 is used for contacting the ground and supporting the whole chair frame, the chair seat support rod is mounted on the footrest 1, the chair seat frame 2 is mounted on the chair seat support rod, the footrest assembly 6 is rotatably mounted on the chair seat frame 2, the chair back frame is rotatably mounted on the chair seat frame 2 so that the chair back frame can tilt back and forth relative to the chair seat frame 2, and the headrest frame is mounted on the chair back frame.

In the embodiment, the chair back frame comprises a lower chair back frame 3 and an upper chair back frame 4, the lower chair back frame 3 is hinged with the chair seat frame 2, and the lower chair back frame 3 is hinged with the upper chair back frame 4; the headrest frame is arranged above the upper backrest frame 4,

a first electric push rod 12, a footrest component 6 and a second driving mechanism are also arranged, one end of the first electric push rod 12 is rotatably arranged on the lower back-of-chair frame 3, the other end is rotatably arranged on the chair seat frame 2, the footrest component 6 is rotatably arranged on the chair seat frame 2, the second driving mechanism is arranged on the chair seat frame 2, the lower back-of-chair frame 3 is hinged with the upper back-of-chair frame 4,

the first electric push rod 12 is used for driving the lower back frame 3 to tilt relative to the seat frame 2;

the second driving mechanism is used for driving the footrest assembly 6 to rotate so as to lift and put down the footrest assembly 6, and enabling the footrest assembly 6 to extend in the lifting process of the footrest assembly 6 and enabling the footrest assembly 6 to shorten in the putting down process of the footrest assembly 6.

In this embodiment, the second driving mechanism includes a second electric push rod 13, a second linkage rod, a third link mechanism, a linkage assembly and two sets of left and right second link mechanisms, the second link mechanism connects the chair seat frame 2 and the footrest assembly 6, the third link mechanism is installed on the footrest assembly 6, the linkage assembly is rotatably installed on the chair seat frame 2 and connected with the third link mechanism, the second linkage rod is fixedly connected with or integrally formed with the second link mechanism, the rear end of the second electric push rod 13 is hinged with the chair seat frame 2, the front end of the second electric push rod 13 is hinged with the second linkage rod, and when the second electric push rod 13 extends, the footrest assembly 6 is lifted through the second link mechanism, and in the process of lifting the footrest assembly 6, the third link mechanism is driven by the lifting assembly to operate so as to extend the footrest assembly 6; when second electric putter 13 shortens, make footrest subassembly 6 put down through second link mechanism to in-process that footrest subassembly 6 put down drives the third link mechanism function simultaneously through the linkage subassembly and so that footrest subassembly 6 shortens.

In the embodiment of the present application, the second link mechanism includes a fifth link and a sixth link 62, the fifth link is rotatably installed at the side of the seat frame 2, one end of the fifth link is hinged with one end of the sixth link 62, and the other end of the sixth link 62 is rotatably installed at the side of the footrest assembly 6; two ends of the second linkage rod are fixedly connected with the left fifth connecting rod and the right fifth connecting rod or are integrally formed.

Preferably, the chair is further provided with two parallel vertical third mounting plates and two parallel vertical fourth mounting plates, the second linkage rod is a square tube, the bottom end of the third mounting plate is fixedly connected with the second linkage rod in a welding mode, the top end of the third mounting plate is hinged to the front end of the second electric push rod 13, the top end of the fourth mounting plate is fixedly connected with the chair seat frame 2 in a welding mode, and the bottom end of the fourth mounting plate is hinged to the rear end of the second electric push rod 13; and the third mounting plate is mounted on the second linkage rod and the fourth mounting plate is mounted on the seat frame 2 through the combined action of the third mounting plate, the fourth mounting plate and the second electric push rod 13.

As shown in fig. 7, in the present embodiment, the footrest assembly 6 includes a first footrest 63 and a second footrest 64, the first footrest 63 is rotatably mounted on the seat frame 2, and the second footrest 64 is slidably mounted on the first footrest 63; more preferably, the first footrest 63 is mounted on the seat frame 2 through two second rotation shafts 14 which are bilaterally symmetrical and horizontally disposed, and rotates with the second rotation shafts 14 as rotation center shafts, and the second rotation shafts 14 are fixedly connected with the seat frame 2;

more preferably, the sixth link 62 is provided with a concave arc-shaped bent part at a part close to the footrest assembly 6; this is provided to enhance the structural strength of the sixth link 62 and to prevent the sixth link 62 from touching the second rotating shaft 14 during the rotation.

The third link mechanism comprises an eighth link 65 and a ninth link 66, the eighth link 65 is rotatably mounted on the first footrest 63, the rear end of the eighth link 65 is in transmission connection with the other end of the linkage assembly, the front end of the eighth link 65 is hinged with the rear end of the ninth link 66, and the front end of the ninth link 66 is rotatably mounted on the second footrest 64, further preferably, the distance between the front end of the eighth link 65 and the rotation center of the eighth link 65 is greater than the distance between the rear end of the eighth link 65 and the rotation center of the eighth link 65; this arrangement enlarges the sliding stroke of the second footrest 64.

In the embodiment of the present application, as shown in fig. 7, the linkage assembly includes a sixth mounting plate 80, a fourth rotation shaft 84, a fourth connecting rod 82 and a connecting member 83, the sixth mounting plate 80 is fixedly connected or integrally formed with the seat frame 2, the fourth rotation shaft 84 is transversely mounted on the sixth mounting plate 80 and located behind the second rotation shaft 14, one end of the fourth connecting rod 82 is hinged to the sixth mounting plate 80 through the fourth rotation shaft 84, and the other end of the fourth connecting rod 82 is movably connected to the eighth connecting rod 65 through the connecting member 83.

In this embodiment, the connecting member 83 is an L-shaped block and includes a horizontal plate and a vertical plate, the fourth link 82 is a plate-shaped structure, the fourth link 82 is hinged to the vertical plate of the connecting member 83, and the horizontal plate of the connecting member 83 is hinged to the eighth link 65; further preferably, a joint bearing is further provided, the joint bearing is mounted on the fourth rotating shaft 84, and one end of the fourth connecting rod 82 is sleeved on the joint bearing.

In other embodiments, the structure of the connecting member 83 'may refer to chinese patent publication No. CN111096594A, and specifically, as shown in fig. 11, a third rotating shaft 16 is further provided, the third rotating shaft 16 is vertically installed on the eighth connecting rod 65, the connecting member 83' is a joint bearing, the fourth connecting rod 82 is a rod-shaped structure, the fourth connecting rod 82 is fixedly connected to one end of the connecting member 83 ', and the other end of the connecting member 83' is sleeved on the third rotating shaft 16; further preferably, a second joint bearing is further provided, the second joint bearing is mounted on the fourth rotating shaft 84, and one end of the fourth connecting rod 82 is sleeved on the joint bearing.

With the arrangement, in the process of lifting and lowering the footrest assembly 6, the fourth link 82 rotates with the fourth rotating shaft 84 as a central shaft, and the footrest assembly 6 rotates with the second rotating shaft 14 as a central shaft, so that the fourth link 82 can urge the second footrest 64 to slide out through the deviation of rotation, and the arrangement of the joint bearing enables the fourth link 82 to rotate in the vertical plane, and the fourth link 82 also has a certain rotation allowance in the horizontal plane, so that the eighth link 65 can rotate to urge the second footrest 64 to slide out.

In this embodiment, as shown in fig. 8, the link device 5 includes a first link 50, a first fixing plate 51 and a second link 52, the first fixing plate 51 is fixedly installed at one side of the seat frame 2, the lower back frame 3 is hinged to the rear half portion of the first fixing plate 51, one end of the first link 50 is hinged to the front half portion of the first fixing plate 51, the other end of the first link 50 is hinged to one end of the second link 52, and the other end of the second link 52 is hinged to the upper back frame 4.

So set up, lower back of the chair frame 3 is through link means 5 and the rotatable installation of first electric putter 12 on seat frame 2 to through the cooperation with gas pole 11 make the process of inclining of lower back of the chair frame 3 level and smooth, and because link means 5, lower back of the chair frame 3 and last back of the chair frame 4 form a five-bar linkage, in the initial process that lower back of the chair frame 3 inclines backward, last back of the chair frame 4 can rotate forward under link means 5's drive, and rotate to rotatable maximum angle with lower back of the chair frame 3 simultaneously.

In the present embodiment, in the process of rotating the lower back frame 3 backward from the initial position to the maximum rotatable position, the angle of rotation of the lower back frame 3 backward is greater than the angle of rotation of the first link 50 backward.

In this embodiment, in the process that the lower back-rest frame 3 rotates backwards from the initial position to the maximum rotation, and when the hinge point of the first connecting rod 50 and the first fixing plate 51, the hinge point of the first connecting rod 50 and the second connecting rod 52, and the hinge point of the second connecting rod 52 and the upper back-rest frame 4 are located on the same straight line, the distance that the hinge point of the second connecting rod 52 and the upper back-rest frame 4 translates backwards is less than the distance that the hinge point of the upper back-rest frame 4 and the lower back-rest frame 3 translates backwards; this is so arranged that, when the lower back frame 3 is moved to the maximum turnable position, the upper back frame 4 is still turnable, but when the upper back frame 4 rotates backward until the hinge point of the first link 50 and the first fixing plate 51, the hinge point of the first link 50 and the second link 52, and the hinge point of the second link 52 and the upper back frame 4 are located on the same straight line, the link means 5, the upper back frame 4 and the lower back frame 3 form a four-bar linkage, and at this time, the lower back frame 3 and the first fixing plate 51 are all in a fixed state, namely, two rods in the four-bar linkage mechanism are fixed, so the whole four-bar linkage mechanism is in a fixed state, and at this time, the hinge point of the second link 52 and the upper back frame 4 is translated backward by a distance smaller than the hinge point of the upper back frame 4 and the lower back frame 3, that is, the upper back frame 4 is raised.

In this embodiment, two first limiting members 41 on the left and right and two second limiting members 31 on the left and right are further provided;

the first limiting member 41 is fixedly connected with or integrally formed with the upper back frame 4, and the second limiting member 31 is fixedly connected with or integrally formed with the lower back frame 3; or, the first limiting member 41 is fixedly connected to or integrally formed with the lower back frame 3, and the second limiting member 31 is fixedly connected to or integrally formed with the upper back frame 4;

the first limiting member 41 cooperates with the second limiting member 31 to limit the upper back frame 4 from rotating backwards.

As shown in fig. 5, the first position-limiting member 41 is a column-shaped structure integrally formed with the upper back-rest frame 4, the second position-limiting member 31 is a block-shaped structure formed by extending the upper end of the lower back-rest frame 3 upwards, and when the first position-limiting member 41 abuts against the second position-limiting member 31, the included angle between the upper back-rest frame 4 and the lower back-rest frame 3 is 100 degrees and 180 degrees; further preferably, when the first limiting member 41 abuts against the second limiting member 31, an included angle between the upper back frame 4 and the lower back frame 3 is 180 degrees.

In this embodiment, in the process that the lower back frame 3 rotates backward from the initial position to the maximum rotatable state, the angle of backward rotation of the lower back frame 3 is greater than that of the backward rotation of the upper back frame 4.

As shown in fig. 9, the first link 50 includes a first section 501, a second section 502 and a third section 503 which are linear and integrally formed, wherein the first section 501 is hinged to the first fixing plate 51, the third section 503 is hinged to the second link 52, and the second section 502 is connected to the first section 501 and the third section 503 such that the bottom of the third section 503 is closer to the lower back frame 3. The arrangement is to prevent the first connecting rod 50 and the second connecting rod 52 from being locked when the hinge point of the first connecting rod 50 and the first fixing plate 51, the hinge point of the first connecting rod 50 and the second connecting rod 52, and the hinge point of the second connecting rod 52 and the upper back frame 4 are located on the same straight line, and to prevent the thickness of the chair back from being too large. In other embodiments, the first, second and third segments 501, 502, 503 may also be arc-shaped.

In this embodiment, as shown in fig. 6, the left and right sides of the lower back frame 3 are both provided with first positioning holes 32, the left and right sides of the upper back frame 4 are both provided with second positioning holes 42, and when the first positioning holes 32 and the second positioning holes 42 are coaxially distributed, the included angle between the upper back frame 4 and the lower back frame 3 is 100 degrees and 180 degrees; further preferably, when the first positioning hole 32 and the second positioning hole 42 are coaxially distributed, the included angle between the upper back frame 4 and the lower back frame 3 is 180 degrees; this is so arranged because when the lower back frame 3 is not rotated backward, the lower back frame 3 and the upper back frame 4 are generally parallel, and the first positioning hole 32 and the second positioning hole 42 are also coaxially distributed; then, the positioning pin is inserted into the first positioning hole 32 and the second positioning hole 42, so that the lower back frame 3 and the upper back frame 4 are not rotatable, at this time, a four-bar mechanism is formed among the link device 5, the lower back frame 3 and the upper back frame 4, the lower back frame 3 can still rotate backwards relative to the seat frame 2, but the rotatable range is small, namely, the seat frame is suitable for users in office state, when the positioning pin is taken out, the rotatable range of the lower back frame 3 is increased, and a deck chair can be formed, namely, the seat frame is suitable for users in rest state.

In this embodiment, as shown in fig. 10, a left third fixing plate 53 and a right third fixing plate 53, a left sliding groove member 55 and a right sliding groove member 54 are further provided, the third fixing plate 53 is welded and fixed to the seat frame 2, both the sliding groove members 55 and the locking members 54 are fixedly mounted on the third fixing plate 53, and the first fixing plate 51 is inserted and mounted in the sliding groove members 55 and cooperates with the locking members 54 to form a locking structure; this arrangement allows the first fixing plate 53 to be stably mounted on the seat frame 2.

In this embodiment, the chute member 55 includes two opposite chutes, which gradually approach from top to bottom, and the third fixing plate 53 is shaped to match with the two chutes. The third fixing plate 53 is configured so as not to penetrate through the chute member 55 when inserted downward.

In the present embodiment, the chute element 55 is inserted into the locking element 54, the locking element 54 extends upward to form a V-shaped extending portion 541, the first fixing plate 51 is provided with a third positioning hole 510, and the bottom of the extending portion 541 extends into the third positioning hole 510. With such an arrangement, when the first fixing plate 51 moves from top to bottom on the sliding groove member 55, the first fixing plate 51 will first abut against the bottom of the extending portion 541 and lift the bottom of the extending portion 541, and when the first fixing plate 51 moves to the end, the bottom of the extending portion 541 is also located at the third positioning hole 510, and then extends into the third positioning hole 510 to form a fastening structure, so that the first fixing plate 53 can be stably installed on the seat frame 2.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A chair frame with a footrest comprises a chair seat frame (2), a chair back frame and a headrest frame, wherein the chair back frame is rotatably arranged on the chair seat frame (2) to enable the chair back frame to tilt forwards and backwards relative to the chair seat frame (2), the headrest frame is arranged on the chair back frame, and the chair frame is characterized in that,

the chair back frame comprises a lower chair back frame (3) and an upper chair back frame (4), the lower chair back frame (3) is hinged with the chair seat frame (2), and the lower chair back frame (3) is hinged with the upper chair back frame (4); the headrest frame is arranged on the upper chair back frame (4),

a first electric push rod (12), a footrest component (6) and a second driving mechanism are also arranged, one end of the first electric push rod (12) is rotatably arranged on the lower back-of-chair frame (3) and the other end thereof is rotatably arranged on the chair seat frame (2), the footrest component (6) is rotatably arranged on the chair seat frame (2), the second driving mechanism is arranged on the chair seat frame (2),

the first electric push rod (12) is used for driving the lower chair back frame (3) to tilt relative to the chair seat frame (2);

the second driving mechanism is used for driving the footrest component (6) to rotate so as to lift and put down the footrest component (6).

2. The chair frame with footrest according to claim 1, characterized in that it further comprises two first stoppers (41) and two second stoppers (31);

the first limiting piece (41) is fixedly connected with the upper backrest frame (4) or integrally formed, and the second limiting piece (31) is fixedly connected with the lower backrest frame (3) or integrally formed; or, the first limiting piece (41) is fixedly connected with or integrally formed with the lower back frame (3) and the second limiting piece (31) is fixedly connected with or integrally formed with the upper back frame (4);

the first limiting piece (41) is matched with the second limiting piece (31) so as to limit the upper chair back frame (4) to rotate backwards.

3. The chair frame with footrest as claimed in claim 2, wherein the first position-limiting member (41) is a column-shaped structure integrally formed with the upper back frame (4), the second position-limiting member (31) is a block-shaped structure formed by extending the upper end of the lower back frame (3) upward, and when the first position-limiting member (41) abuts against the second position-limiting member (31), the angle between the upper back frame (4) and the lower back frame (3) is 100-180 °.

4. The chair frame with the footrest as claimed in claim 1, wherein there are two left and right link mechanisms (5), the link mechanisms (5) comprise a first link (50), a first fixing plate (51) and a second link (52), the first fixing plate (51) is fixedly installed at one side of the chair seat frame (2), the lower back frame (3) is hinged with the rear half part of the first fixing plate (51), one end of the first link (50) is hinged with the front half part of the first fixing plate (51), the other end of the first link (50) is hinged with one end of the second link (52), and the other end of the second link (52) is hinged with the upper back frame (4).

5. The chair frame with footrest according to claim 1, characterized in that the lower back frame (3) is rotated backward by a larger angle than the upper back frame (4) during the backward rotation of the lower back frame (3) from the initial position to the maximum rotation.

6. The chair frame with footrest according to claim 1, characterized in that the footrest assembly (6) comprises a first footrest (63) and a second footrest (64), the first footrest (63) is mounted on the chair seat frame (2) through two second rotation shafts (14) which are bilaterally symmetrical and horizontally disposed, and rotates with the second rotation shaft (14) as a rotation center shaft, the second rotation shaft (14) is fixedly connected with the chair seat frame (2), and the second footrest (64) is slidably mounted on the first footrest (63).

7. The chair frame with the footrest as claimed in claim 1, wherein the second driving mechanism comprises a second electric push rod (13), a second linkage rod, a third linkage mechanism, a linkage assembly and two sets of left and right second linkage mechanisms, the second linkage mechanism connects the chair seat frame (2) and the footrest assembly (6), the third linkage mechanism is mounted on the footrest assembly (6), the linkage assembly is rotatably mounted on the chair seat frame (2) and connected with the third linkage mechanism, the second linkage rod is fixedly connected with or integrally formed with the second linkage mechanism, the rear end of the second electric push rod (13) is hinged with the chair seat frame (2), the front end of the second electric push rod (13) is hinged with the second linkage rod, and when the second electric push rod (13) extends, the footrest assembly (6) is lifted by the second linkage mechanism and during the lifting of the footrest assembly (6), the third link mechanism is driven to operate through the linkage component so as to extend the footrest component (6); when the second electric push rod (13) is shortened, the footrest component (6) is put down through the second link mechanism, and in the process that the footrest component (6) is put down, the third link mechanism is driven to operate through the linkage component so as to shorten the footrest component (6);

the second connecting rod mechanism comprises a fifth connecting rod and a sixth connecting rod (62), the fifth connecting rod is rotatably arranged on the side surface of the chair seat frame (2), one end of the fifth connecting rod is hinged with one end of the sixth connecting rod (62), and the other end of the sixth connecting rod (62) is rotatably arranged on the side surface of the footrest assembly (6); two ends of the second linkage rod are fixedly connected with the left fifth connecting rod and the right fifth connecting rod or are integrally formed;

the third link mechanism comprises an eighth link (65) and a ninth link (66), the eighth link (65) is rotatably mounted on the first footrest (63), the rear end of the eighth link (65) is in transmission connection with the other end of the linkage assembly, the front end of the eighth link (65) is hinged to the rear end of the ninth link (66), and the front end of the ninth link (66) is rotatably mounted on the second footrest (64).

8. The chair frame with the footrest as claimed in claim 7, wherein the linkage assembly comprises a sixth mounting plate (80), a fourth rotation shaft (84), a fourth connecting rod (82) and a connecting member (83), the sixth mounting plate (80) is fixedly connected with or integrally formed with the chair seat frame (2), the fourth rotation shaft (84) is transversely mounted on the sixth mounting plate (80) and located behind the second rotation shaft (14), one end of the fourth connecting rod (82) is hinged to the sixth mounting plate (80) through the fourth rotation shaft (84), and the other end of the fourth connecting rod (82) is movably connected with the eighth connecting rod (65) through the connecting member (83).

9. The chair frame with footrest according to claim 8, characterized in that the connecting member (83) is an L-shaped block comprising a horizontal plate and a vertical plate, the fourth connecting rod (82) is a plate-shaped structure, the fourth connecting rod (82) is hinged with the vertical plate of the connecting member (83), and the horizontal plate of the connecting member (83) is hinged with the eighth connecting rod (65).

10. The chair frame with footrest according to claim 8, characterized in that a third rotation shaft (16) is further provided, the third rotation shaft (16) is vertically mounted on the eighth connecting rod (65), the connecting member (83 ') is a joint bearing, the fourth connecting rod (82) is a rod-like structure, the fourth connecting rod (82) is fixedly connected with one end of the connecting member (83 '), and the other end of the connecting member (83 ') is sleeved on the third rotation shaft (16).

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