CN221577263U - Folding chair frame and folding chair with same - Google Patents

Abstract

The application discloses a folding chair frame and a folding chair with the same, comprising a chair seat; a chair back part, wherein a first folding component which is X-shaped when unfolded is arranged on the chair back part; a foot rest part, on which a second folding component is arranged; the support leg part comprises a front support leg unit and a rear support leg unit, the front support leg unit is hinged to the chair seat part, a third folding assembly is arranged on the front support leg unit, a penetrating sleeve is arranged on the rear support leg unit, the penetrating sleeve is hinged to the chair seat part, and the penetrating sleeve can move along the up-down direction; the first folding component is used for folding the back of the chair along the left-right direction, the second folding component is used for folding the foot rest part along the left-right direction, and the third folding component is used for folding the seat part and the foot rest part along the left-right direction; a linkage rod is arranged between the chair back part and the foot rest part, and when the chair back part is far away from or rotates relatively towards the chair seat part, the linkage rod can be used for linkage unfolding or folding the foot rest part. The folding device has the advantages of smoothness, convenience and good stability in folding.

Description

Folding chair frame and folding chair with same

Technical Field

The application relates to the technical field of outdoor sports equipment, in particular to a folding chair frame and a folding chair with the same.

Background

Nowadays, with the gradual increase of the living standard of people, outdoor exercises are favored by more and more people, and when people perform outdoor exercises, in order to obtain better experiences, outdoor articles are generally required to be carried, and the folding chairs are undoubtedly an indispensable single article in the outdoor articles.

Because the folding chair has the advantages of being capable of being unfolded and folded for storage, when the folding chair is required to be carried or stored, the volume of the folding chair can be effectively reduced by folding the folding chair, so that the occupied space during carrying is reduced, the folding chair is more convenient to carry, and when the folding chair is required to be used, a stable chair can be formed by unfolding the folding chair, and people can enjoy a more comfortable rest environment outdoors.

The folding chair generally comprises a folding chair frame and a chair surface structure, and in the folding chair frame in the prior art, the folding and unfolding of the foot rest part are not convenient enough, and the folding of the whole folding chair frame is not smooth and convenient enough.

Disclosure of Invention

The application aims to provide the folding chair frame which is smooth and convenient to fold, good in stability and good in use experience.

Another object of the present application is to provide a folding chair which is convenient to carry and stable after being unfolded.

In order to achieve the above purpose, the application adopts the following technical scheme: a folding chair frame, comprising

A seat portion;

the chair back part is hinged to the rear end of the chair seat part, and a first folding component which is X-shaped when unfolded is arranged on the chair back part;

The foot rest part is hinged to the front end of the chair seat part, and a second folding assembly is arranged on the foot rest part;

The support leg comprises a front support leg unit and a rear support leg unit, the front support leg unit is hinged to the chair seat, a third folding assembly is arranged on the front support leg unit, a penetrating sleeve is arranged on the rear support leg unit, the penetrating sleeve is hinged to the chair seat, and the penetrating sleeve can move along the up-down direction;

the first folding component is used for folding the chair back part along the left-right direction, the second folding component is used for folding the leg rest part along the left-right direction, and the third folding component is used for folding the chair seat part and the support leg part along the left-right direction; and a linkage rod is arranged between the chair back part and the foot rest part, and when the chair back part is far away from or faces to the chair seat part to relatively rotate, the linkage rod can be used for linkage unfolding or folding the foot rest part.

Preferably, the connecting protrusion extending in the left-right direction is arranged on the connecting sleeve, the connecting protrusion is hinged to the seat part, and when the rear supporting leg unit and the seat part relatively rotate, the connecting sleeve can synchronously move along the rear supporting leg unit in the up-down direction; the rear supporting leg unit is provided with a limiting sleeve, the limiting sleeve is fixedly arranged on the rear supporting leg unit, and the limiting sleeve is used for limiting the upward movement range of the cross-over sleeve.

As another preferable mode, one end of the linkage rod is hinged to the bottom end of the chair back part, and the other end of the linkage rod is hinged to the middle-upper section of the foot rest part; one end of the chair seat is hinged to the middle lower section of the chair back, and the other end of the chair seat is hinged to the end part of the foot rest, so that a parallelogram-like structure is formed, and the foot rest and the chair back can synchronously rotate in the same direction.

Further preferably, the first folding assembly includes a first folding bar and a second folding bar, the seat back portion includes a first seat back bar and a second seat back bar, an upper end of the first folding bar is hinged to the second seat back bar, a lower end of the first folding bar is hinged to the first seat back bar, an upper end of the second folding bar is hinged to the first seat back bar, and a lower end of the second folding bar is hinged to the second seat back bar; the first folding rod and the second folding rod are mutually hinged in a crossing mode, a control unit is arranged between the first folding rod and the second folding rod and comprises a linkage piece, and the movement of the linkage piece along the up-down direction can drive the first folding assembly to fold or unfold.

Still preferably, the control unit further comprises a first connecting rod and a second connecting rod, one end of the first connecting rod is hinged to the second folding rod, one end of the second connecting rod is hinged to the first folding rod, the other ends of the first connecting rod and the second connecting rod are both hinged to the linkage piece, and when the linkage piece moves in the vertical direction, the linkage piece can drive the first folding rod and the second folding rod to be close to or far away from each other through rotation of the first connecting rod and the second connecting rod, so that the first folding assembly is driven to be folded or unfolded.

Further preferably, the first connecting rod and the second connecting rod are symmetrically arranged, so that the first connecting rod and the second connecting rod can be simultaneously rotated to a horizontal arrangement state; the linkage piece comprises a limiting part arranged at the top end, and when the first connecting rod and the second connecting rod are in a horizontal arrangement state, the limiting part is propped against the first connecting rod and the second connecting rod; the linkage is disposed above the hinge point of the first folding bar and the second folding bar.

Further preferably, the lower end of the first folding rod is hinged with a first rotating rod, the other end of the first rotating rod is hinged with the first chair back rod, the lower end of the second folding rod is hinged with a second rotating rod, the other end of the second rotating rod is hinged with the second chair back rod, and when the first folding assembly folds along the left-right direction, the first rotating rod and the second rotating rod rotate downwards.

Further preferably, the leg rest portion comprises a first leg rest rod and a second leg rest rod, the second folding assembly comprises a first movable rod, a second movable rod and a rotating seat, one end of the first movable rod is hinged to the first leg rest rod, one end of the second movable rod is hinged to the second leg rest rod, and the other ends of the first movable rod and the second movable rod are both hinged to the rotating seat.

Further preferably, the front support leg unit includes a first front support leg and a second front support leg, the seat portion includes a first seat bar and a second seat bar, the third folding assembly includes a first crossbar and a second crossbar, the first crossbar and the second crossbar are cross-hinged with each other, and one end of the first crossbar is hinged with the second seat bar, and the other end is hinged with the first front support leg; one end of the second cross rod is hinged with the first seat rod, and the other end of the second cross rod is hinged with the second front supporting leg.

The application also provides a folding chair, which comprises the folding chair frame and a chair surface structure detachably arranged on the folding chair frame.

Compared with the prior art, the application has the beneficial effects that:

(1) The application adopts the technical means that the linkage rod is arranged between the chair back part and the leg rest part, so that the linkage function is realized between the chair back part and the leg rest part, and when the chair back part and the chair seat part relatively rotate, the linkage rod synchronously drives the leg rest part to unfold or fold, so that the use is more convenient for a user.

(2) According to the application, the first folding component is arranged on the back of the chair, the second folding component is arranged on the foot rest, and the third folding component is arranged between the foot rest and the seat part, so that the stability of each component is effectively improved while the folding of each component in the chair frame along the left-right direction is ensured, and the overall stability and safety of the chair frame are improved.

(3) The first folding component is X-shaped, and the structure has the advantages of smooth and convenient folding and is simple and attractive in structure.

(4) The rear supporting leg unit and the chair seat are hinged through the penetrating sleeve capable of moving up and down, so that the rear supporting leg unit is smoother when being folded, is not easy to be blocked, and the folding chair frame is compact in structure, small in size and convenient to carry and transport after being folded.

Drawings

FIG. 1 is a schematic view of a folding chair of the present application when unfolded;

FIG. 2 is a schematic view of the folding chair frame of the present application when folded;

FIG. 3 is a schematic view of the foot rest and the second folding assembly of the present application when unfolded;

FIG. 4 is a schematic view of the seat back and first folding assembly of the present application as deployed;

FIG. 5 is a rear elevational view of the seatback portion and the first folding assembly of the present application as unfolded;

FIG. 6 is a rear elevational view of the seatback portion and the first folding assembly of the present application when folded;

FIG. 7 is a schematic view of the chair seat and leg of the present application in an expanded configuration;

FIG. 8 is a schematic view of the chair seat and leg of the present application in a folded configuration;

FIG. 9 is a schematic view of the leg portion, seat portion and third folding assembly of the present application;

FIG. 10 is a left side view of the leg portion, seat portion and third folding assembly of the present application;

FIG. 11 is a side view of the folding chair frame of the present application in use for sitting;

FIG. 12 is a side view of the folding chair of the present application when used in recline;

Fig. 13 is a schematic view of the structure of the folding chair frame of the present application after the seat structure is installed.

In the figure: 1. a seat portion; 11. a first seat post; 12. a second seat post; 2. a chair back; 21. a first folding component; 211. a first folding bar; 212. a second folding bar; 213. a control unit; 2131. a linkage member; 2132. a first connecting rod; 2133. a second connecting rod; 2134. a limit part; 214. a first rotating lever; 215. a second rotating lever; 22. a first seatback lever; 23. a second seatback lever; 3. foot rest; 31. a second folding assembly; 311. a first movable lever; 312. a second movable rod; 313. a rotating seat; 32. a first leg rest bar; 33. a second leg rest bar; 4. a leg portion; 41. a front support leg unit; 411. a first front support leg; 412. a second front support leg; 42. a rear support leg unit; 421. a sleeve is connected in a penetrating way; 4211. a connection protrusion; 422. a limit sleeve; 43. a third folding assembly; 431. a first crossbar; 432. a second cross bar; 5. a linkage rod; 6. a chair surface structure.

Detailed Description

The present application will be further described with reference to the following specific embodiments, and it should be noted that, on the premise of no conflict, new embodiments may be formed by any combination of the embodiments or technical features described below.

In the description of the present application, it should be noted that, for the azimuth words such as terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the azimuth and positional relationships are based on the azimuth or positional relationships shown in the drawings, it is merely for convenience of describing the present application and simplifying the description, and it is not to be construed as limiting the specific scope of protection of the present application that the device or element referred to must have a specific azimuth configuration and operation.

It should be noted that the terms "first," "second," and the like in the description and in the claims are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.

The terms "comprises" and "comprising," along with any variations thereof, in the description and claims, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

As shown in fig. 1-12, the preferred embodiment of the present application is:

A folding chair frame, comprising

A seat part 1;

A back part 2, the back part 2 is hinged at the rear end of the seat part 1, and the back part 2 is provided with a first folding component 21 which is X-shaped when unfolded;

The foot rest part 3, the foot rest part 3 is hinged to the front end of the chair seat part 1, and a second folding component 31 is arranged on the foot rest part 3;

The support leg part 4, the support leg part 4 comprises a front support leg unit 41 and a rear support leg unit 42, the front support leg unit 41 is hinged with the chair seat 1, the front support leg unit 41 is provided with a third folding assembly 43, the rear support leg unit 42 is provided with a penetrating sleeve 421, the penetrating sleeve 421 is hinged with the chair seat 1, and the penetrating sleeve 421 can move along the up-down direction;

The first folding assembly 21 is used for folding the seat back 2 in the left-right direction, the second folding assembly 31 is used for folding the foot rest 3 in the left-right direction, and the third folding assembly 43 is used for folding the seat part 1 and the foot part 4 in the left-right direction; a linkage rod 5 is arranged between the chair back 2 and the foot rest 3, and when the chair back 2 is far away from or rotates relatively towards the chair seat 1, the linkage rod 5 can be used for linkage unfolding or folding the foot rest 3.

The advantages of the above structure are: 1. in the application, an independent folding component is arranged in the chair back part 2, the foot rest part 3 and between the support leg part 4 and the chair seat part 1, so that the stability of the whole structure is higher and the safety performance is better. 2. The application adopts the technical means that the linkage rod 5 is arranged between the chair back part 2 and the foot rest part 3, so that the linkage function is realized between the chair back part 2 and the foot rest part 3, and when the chair back part 2 and the chair seat part 1 relatively rotate, the linkage rod 5 synchronously drives the foot rest part 3 to unfold or fold, so that a user is more convenient to use. 3. The first folding assembly 21 of the present application has the advantages of being smooth and convenient to fold, and simple and beautiful in structure. 4. The rear supporting leg unit 42 and the seat part 1 are hinged through the penetrating sleeve 421 which can move up and down, so that the rear supporting leg unit 42 can be effectively ensured to be smoother when being folded, and is not easy to be blocked.

It should be noted that the advantage of the connecting sleeve 421 further includes that the structure is more compact, the volume is smaller, and the carrying and the transportation are more convenient after the folding of the folding chair frame are completed. Specifically, as shown in fig. 7 and 8, when the folding chair frame is folded, the penetration sleeve 421 moves downward synchronously, so that the seat portion 1 moves downward relative to the leg portion 4, and the overlapping portions of the seat portion 1 and the leg portion 4 increase, thereby making the overall structure more compact.

As shown in fig. 11 and 12, in the present embodiment, one end of the link lever 5 is hinged to the bottom end of the seatback portion 2, and the other end is hinged to the upper middle section of the leg rest portion 3; one end of the seat part 1 is hinged to the middle lower section of the seat back part 2, and the other end is hinged to the end part of the leg rest part 3, so that a parallelogram-like structure is formed, and the leg rest part 3 and the seat back part 2 can synchronously rotate in the same direction. With the above structure, the leg rest 3 and the seatback 2 are linked reliably, that is, when the leg rest 3 rotates counterclockwise as shown in fig. 12, the seatback 2 also rotates counterclockwise with a step. Therefore, when the user wants to switch the folding chair frame in fig. 11 to the folding chair frame in fig. 12, the user only needs to pull one of the foot rest 3 or the chair back 2 to rotate, which is very convenient. Similarly, when the chair frame needs to be folded, only one of the chair frames needs to be driven to rotate clockwise, and the other part also rotates clockwise in the same step, so that linkage folding is realized.

As shown in fig. 7 and 8, in the present embodiment, the connecting protrusion 4211 formed by extending in the left-right direction is provided on the connecting sleeve 421, and the connecting protrusion 4211 is hinged to the seat portion 1, so that when the rear supporting leg unit 42 and the seat portion 1 rotate relatively, the connecting sleeve 421 can move in the up-down direction along the rear supporting leg unit 42 synchronously. The above structure ensures that the rear leg unit 42 and the seat portion 1 can be rotated relatively, on the one hand, and that the connection boss 4211 as a hinge point can be moved relatively to the rear leg unit 42, on the other hand. Therefore, the above structure reliably ensures the foldable function of the seat portion 1 and the leg portion 4, and further ensures smoothness in folding.

Further, in the present embodiment, the rear supporting leg unit 42 is provided with a limiting sleeve 422, the limiting sleeve 422 is fixedly disposed on the rear supporting leg unit 42, and the limiting sleeve 422 is used for limiting the upward movement range of the connecting sleeve 421. The spacer 422 serves to limit the extent of the expansion of the leg portion 4, that is, to limit the increase of the angle between the front leg unit 41 and the rear leg unit 42 as shown in fig. 7. Because the foot portion 4 is supported when the occupant sits on the folding seat frame, the front and rear leg units 41 and 42 are forced to move away from each other such that the angle therebetween increases, and the stop collar 422 is effective to provide a force to restrain the movement, thereby increasing stability and safety when riding.

As shown in fig. 4 to 6, in the present embodiment, the first folding assembly 21 includes a first folding bar 211 and a second folding bar 212, the seatback portion 2 includes a first seatback bar 22 and a second seatback bar 23, an upper end of the first folding bar 211 is hinged to the second seatback bar 23, a lower end of the first folding bar 211 is hinged to the first seatback bar 22, an upper end of the second folding bar 212 is hinged to the first seatback bar 22, a lower end of the second folding bar 212 is hinged to the second seatback bar 23, and the first folding bar 211 and the second folding bar 212 are cross-hinged to each other; a control unit 213 is disposed between the first folding bar 211 and the second folding bar 212, and the control unit 213 includes a linkage 2131, where the movement of the linkage 2131 along the up-down direction can drive the first folding assembly 21 to fold or unfold. The structure is simple and stable, and the smooth folding function of the chair back part 2 is ensured. In addition, the linkage 2131 can drive the first folding component 21 to fold or unfold through the movement of the linkage 2131 along the up-down direction, so that a user can directly control the folding or unfolding of the chair back 2 through lifting or pressing the linkage 2131 when using the chair, the operation is simpler and more convenient, and the use experience is better.

Further, in the present embodiment, the control unit 213 further includes a first connecting rod 2132 and a second connecting rod 2133, one end of the first connecting rod 2132 is hinged to the second folding rod 212, one end of the second connecting rod 2133 is hinged to the first folding rod 211, and the other ends of the first connecting rod 2132 and the second connecting rod 2133 are both hinged to the linkage 2131; when the linkage 2131 moves in the up-down direction, the linkage 2131 can drive the first folding bar 211 and the second folding bar 212 to approach or separate from each other by rotating the first connecting bar 2132 and the second connecting bar 2133, so as to drive the first folding assembly 21 to fold or unfold. The structure is simple and stable, the operation is simple and convenient, and the use experience of a user can be effectively improved.

Further, in the present embodiment, the first connecting rod 2132 and the second connecting rod 2133 are symmetrically disposed such that the first connecting rod 2132 and the second connecting rod 2133 can be simultaneously rotated to a horizontally disposed state. The structure can ensure bilateral symmetry of the whole structure, so that the structure is more reasonable and the use reliability is higher. And the first connecting rod 2132 and the second connecting rod 2133 may be simultaneously in a horizontally disposed state, thereby being in a maximum unfolded state in a theoretical state.

Without limitation, the linkage 2131 may effect folding by moving upward and downward as the first folding assembly 21 begins to fold from the maximum unfolded configuration. If the linkage 2131 is moved downward, the user needs to drive the linkage 2131 upward when the first folding assembly 21 is unfolded, which is very laborious. And one hand is required to pull up the linkage 2131 and the other hand is required to press the back 2 of the chair to prevent the whole structure from being lifted up, which is inconvenient. In contrast, as shown in fig. 5, in the present embodiment, the link 2131 includes a limiting portion 2134 provided at the distal end, and when the first connecting rod 2132 and the second connecting rod 2133 are in the horizontally disposed state, the limiting portion 2134 abuts against both the first connecting rod 2132 and the second connecting rod 2133. The above structure can effectively solve the above problems, thereby reliably ensuring time and labor saving when the first folding assembly 21 is driven to be folded by the linkage 2131.

Further, in the present embodiment, the linkage 2131 is provided above the hinge point of the first folding bar 211 and the second folding bar 212. The above structure can make the linkage 2131 be in a position that a user better touches and exerts force, thereby further improving convenience and use experience.

It should be noted that, as shown in fig. 5 and 6, in the present embodiment, the lower end of the first folding bar 211 is hinged with a first rotating bar 214, the other end of the first rotating bar 214 is hinged with the first chair back bar 22, the lower end of the second folding bar 212 is hinged with a second rotating bar 215, the other end of the second rotating bar 215 is hinged with the second chair back bar 23, and when the first folding assembly 21 is folded along the left-right direction, the first rotating bar 214 and the second rotating bar 215 rotate downwards. When the first folding unit 21 is folded, the first folding bar 211 and the second folding bar 212 are rotated, and the ends thereof are simultaneously displaced, so that the rotating bar is provided to prevent the locking, thereby reliably ensuring the stable realization of the folding.

As shown in fig. 3, in the present embodiment, the leg rest 3 includes a first leg rest lever 32 and a second leg rest lever 33, the second folding assembly 31 includes a first movable lever 311, a second movable lever 312, and a rotation seat 313, one end of the first movable lever 311 is hinged to the first leg rest lever 32, one end of the second movable lever 312 is hinged to the second leg rest lever 33, and the other ends of the first movable lever 311 and the second movable lever 312 are both hinged to the rotation seat 313. The above structure is simple and stable, and ensures that the leg rest 3 can be folded in the left-right direction.

As shown in fig. 9, in the present embodiment, the front support leg unit 41 includes a first front support leg 411 and a second front support leg 412, the seat portion 1 includes a first seat post 11 and a second seat post 12, the third folding assembly 43 includes a first cross post 431 and a second cross post 432, the first cross post 431 and the second cross post 432 are cross-hinged to each other, and one end of the first cross post 431 is hinged to the second seat post 12, and the other end is hinged to the first front support leg 411; one end of the second cross bar 432 is hinged to the first seat bar 11 and the other end is hinged to the second front support leg 412. The structure is simple and stable, and the support leg part 4 and the chair seat part 1 can be reliably folded along the left-right direction.

It should be noted that, in the present embodiment, when the folding chair frame is in the maximum unfolded state, the angle between the first seat rod 11 and the first front supporting leg 411 is α, and then when the folding chair frame starts to fold, α gradually increases, and at the same time, the third folding assembly 43 folds in the left-right direction, i.e. the direction perpendicular to the paper surface in fig. 10. Therefore, the third folding assembly 43 can achieve synchronization of folding of the folding chair frame in the left-right direction and in the front-rear direction, thereby increasing folding convenience.

As shown in fig. 13, the present application also provides a folding chair including the above-mentioned folding chair frame and a seat structure 6 detachably mounted on the folding chair frame.

The foregoing has outlined the basic principles, features, and advantages of the present application. It will be understood by those skilled in the art that the present application is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present application, and various changes and modifications may be made therein without departing from the spirit and scope of the application, which is defined by the appended claims. The scope of the application is defined by the appended claims and equivalents thereof.

Claims (10)

1. A folding chair frame, characterized in that: comprising

A seat portion;

the chair back part is hinged to the rear end of the chair seat part, and a first folding component which is X-shaped when unfolded is arranged on the chair back part;

The foot rest part is hinged to the front end of the chair seat part, and a second folding assembly is arranged on the foot rest part;

The support leg comprises a front support leg unit and a rear support leg unit, the front support leg unit is hinged to the chair seat, a third folding assembly is arranged on the front support leg unit, a penetrating sleeve is arranged on the rear support leg unit, the penetrating sleeve is hinged to the chair seat, and the penetrating sleeve can move along the up-down direction;

the first folding component is used for folding the chair back part along the left-right direction, the second folding component is used for folding the leg rest part along the left-right direction, and the third folding component is used for folding the chair seat part and the support leg part along the left-right direction; and a linkage rod is arranged between the chair back part and the foot rest part, and when the chair back part is far away from or faces to the chair seat part to relatively rotate, the linkage rod can be used for linkage unfolding or folding the foot rest part.

2. A folding chair as claimed in claim 1, wherein: the connecting protrusion is hinged to the chair seat, and when the rear supporting leg unit and the chair seat rotate relatively, the connecting protrusion can synchronously move along the rear supporting leg unit in the up-down direction; the rear supporting leg unit is provided with a limiting sleeve, the limiting sleeve is fixedly arranged on the rear supporting leg unit, and the limiting sleeve is used for limiting the upward movement range of the cross-over sleeve.

3. A folding chair as claimed in claim 2, wherein: one end of the linkage rod is hinged to the bottom end of the chair back, and the other end of the linkage rod is hinged to the middle upper section of the foot rest part; one end of the chair seat is hinged to the middle lower section of the chair back, and the other end of the chair seat is hinged to the end part of the foot rest, so that a parallelogram-like structure is formed, and the foot rest and the chair back can synchronously rotate in the same direction.

4. A folding chair as claimed in claim 2, wherein: the first folding component comprises a first folding rod and a second folding rod, the chair back part comprises a first chair back rod and a second chair back rod, the upper end of the first folding rod is hinged to the second chair back rod, the lower end of the first folding rod is hinged to the first chair back rod, the upper end of the second folding rod is hinged to the first chair back rod, and the lower end of the second folding rod is hinged to the second chair back rod; the first folding rod and the second folding rod are mutually hinged in a crossing mode, a control unit is arranged between the first folding rod and the second folding rod and comprises a linkage piece, and the movement of the linkage piece along the up-down direction can drive the first folding assembly to fold or unfold.

5. A folding chair as claimed in claim 4, wherein: the control unit further comprises a first connecting rod and a second connecting rod, one end of the first connecting rod is hinged to the second folding rod, one end of the second connecting rod is hinged to the first folding rod, the other ends of the first connecting rod and the second connecting rod are both hinged to the linkage piece, when the linkage piece moves in the vertical direction, the linkage piece can drive the first folding rod and the second folding rod to be close to or far away from each other through rotation of the first connecting rod and the second connecting rod, and accordingly the first folding assembly is driven to be folded or unfolded.

6. A folding chair as claimed in claim 5, wherein: the first connecting rod and the second connecting rod are symmetrically arranged, so that the first connecting rod and the second connecting rod can simultaneously rotate to a horizontal arrangement state; the linkage piece comprises a limiting part arranged at the top end, and when the first connecting rod and the second connecting rod are in a horizontal arrangement state, the limiting part is propped against the first connecting rod and the second connecting rod; the linkage is disposed above the hinge point of the first folding bar and the second folding bar.

7. A folding chair as claimed in claim 4, wherein: the lower extreme of first folding pole articulates there is first dwang, the other end of first dwang articulate in first back of the chair pole, the lower extreme of second folding pole articulates there is the second dwang, the other end of second dwang articulate in second back of the chair pole, works as when first folding subassembly carries out the folding along left and right directions, first dwang with the second dwang rotates downwards.

8. A folding chair as claimed in claim 2, wherein: the foot rest portion comprises a first foot rest rod and a second foot rest rod, the second folding assembly comprises a first movable rod, a second movable rod and a rotating seat, one end of the first movable rod is hinged to the first foot rest rod, one end of the second movable rod is hinged to the second foot rest rod, and the other ends of the first movable rod and the second movable rod are both hinged to the rotating seat.

9. A folding chair as claimed in claim 2, wherein: the front supporting leg unit comprises a first front supporting leg and a second front supporting leg, the seat part comprises a first seat rod and a second seat rod, the third folding assembly comprises a first cross rod and a second cross rod, the first cross rod and the second cross rod are mutually and crossly hinged, one end of the first cross rod is hinged with the second seat rod, and the other end of the first cross rod is hinged with the first front supporting leg; one end of the second cross rod is hinged with the first seat rod, and the other end of the second cross rod is hinged with the second front supporting leg.

10. A folding chair, characterized in that: comprising a folding chair frame as claimed in any one of claims 1 to 9 and a seat structure removably mounted on said folding chair frame.