Folding chair frame and folding chair

Abstract

The utility model discloses a folding chair frame and a folding chair, the folding chair frame comprises a chair seat part and a chair back part, the chair back part comprises a first back rod and a second back rod which extend up and down and are arranged at an interval left and right, and the first back rod and the second back rod are respectively hinged to the rear end of the chair seat part; a first folding assembly is hinged between the first back rod and the second back rod, the first folding assembly comprises an upper folding unit and a lower folding unit which are vertically arranged at an interval, and a first longitudinal rod and a second longitudinal rod are further hinged between the upper folding unit and the lower folding unit; the first longitudinal rod and the second longitudinal rod are suitable for enabling the upper folding unit and the lower folding unit to be folded or unfolded synchronously, and in the folding or unfolding process of the upper folding unit and the lower folding unit, the first longitudinal rod and the second longitudinal rod are arranged in parallel all the time. The smoothness and the stability of the chair back part in the unfolding and folding process and the structural strength of the unfolded chair back part are improved.

Description

Technical Field

[0001] The present application relates to the technical field of folding chairs, and in particular to a folding chair frame and a folding chair. Background Art

[0002] A folding chair is a seat designed for easy carrying and storage. It has a foldable structure and a chair cloth. The folding chair can be unfolded for users to lie down or sit for rest, and can also be folded for easy carrying and storage.

[0003] Since folding chairs can be unfolded and folded for storage, they are widely used in various scenarios, including outdoor activities, emergency rescue, temporary needs, camping, travel, etc. When it is necessary to carry or store, the folding chair can be folded to effectively reduce the volume of the folding chair, thereby reducing the space required for transportation or storage, and making it more convenient to carry. When it is needed, the folding chair can be unfolded to form a stable chair.

[0004] However, in the folding chair frames of the prior art, the folding and unfolding operations of the folding chair frames are not simple enough, the backrest folding structure of the folding chair frames is not stable enough during the folding and unfolding process, and problems such as jamming are prone to occur during the folding and unfolding process, resulting in a poor user experience. Summary of the invention

[0005] One purpose of the present application is to provide a folding chair frame that is smooth to fold and unfold and has a simple structure.

[0006] Another object of the present application is to provide a folding chair with stable support to improve the user's experience.

[0007] To achieve the above objectives, the technical solution adopted in the present application is: a folding chair frame, comprising a seat portion and a back portion, the back portion comprising a first back rod and a second back rod extending up and down and spaced apart from each other left and right, the first back rod and the second back rod are respectively hinged to the rear end of the seat portion, a first folding assembly is hinged between the first back rod and the second back rod, the first folding assembly comprises an upper folding unit and a lower folding unit spaced apart from each other up and down, a first longitudinal rod and a second longitudinal rod are further hinged between the upper folding unit and the lower folding unit, the first longitudinal rod and the second longitudinal rod are suitable for making the upper folding unit and the lower folding unit fold or unfold synchronously, and during the folding or unfolding of the upper folding unit and the lower folding unit, the first longitudinal rod and the second longitudinal rod are always arranged in parallel.

[0008] As a preferred embodiment, the upper folding unit includes an upper folding seat, a first cross bar and a second cross bar, one end of the first cross bar is hinged to the first back bar, one end of the second cross bar is hinged to the second back bar, and the other ends of the first cross bar and the second cross bar are hinged to the upper folding seat, so that the first cross bar and the second cross bar are symmetrically arranged at both ends of the upper folding seat; the lower folding unit includes a lower folding seat, a third cross bar and a fourth cross bar, one end of the third cross bar is hinged to the first back bar, one end of the fourth cross bar is hinged to the second back bar, and the other ends of the third cross bar and the fourth cross bar are hinged to the lower folding seat, so that the third cross bar and the fourth cross bar are symmetrically arranged at both ends of the lower folding seat.

[0009] As another preferred embodiment, two ends of the first longitudinal rod are respectively hinged to the first cross rod and the third cross rod, and the first longitudinal rod is suitable for making the first cross rod and the third cross rod synchronously rotate, fold or unfold; two ends of the second longitudinal rod are respectively hinged to the second cross rod and the fourth cross rod, and the second longitudinal rod is suitable for making the second cross rod and the fourth cross rod synchronously rotate, fold or unfold, and the first longitudinal rod and the second longitudinal rod are arranged in the vertical direction, and the first longitudinal rod and the second longitudinal rod are always arranged in the vertical direction during the process of rotation, folding or unfolding of the first cross rod, the second cross rod, the third cross rod and the fourth cross rod, and the two remain parallel.

[0010] Further preferably, the hinge point of the first cross bar and the first longitudinal bar and the hinge point of the second cross bar and the second longitudinal bar are respectively located at one end of the first cross bar and the second cross bar close to the upper folding seat; the hinge point of the third cross bar and the first longitudinal bar and the hinge point of the fourth cross bar and the second longitudinal bar are respectively located at one end of the third cross bar and the fourth cross bar close to the lower folding seat.

[0011] Furthermore, both ends of the upper folding seat extend outward to form a first limiting portion, which is suitable for abutting against the first cross bar and the second cross bar to limit the maximum unfolding position of the first cross bar and the second cross bar, so that when the upper folding unit is in the maximum unfolding state, the first cross bar and the second cross bar are in a horizontal setting state; both ends of the lower folding seat extend outward to form a second limiting portion, which is suitable for abutting against the third cross bar and the fourth cross bar to limit the maximum unfolding position of the third cross bar and the fourth cross bar, so that when the lower folding unit is in the maximum unfolding state, the third cross bar and the fourth cross bar are in a horizontal setting state.

[0012] Furthermore, the folding chair frame also includes a footrest portion hinged to the front end of the seat portion, one end of the seat portion is hinged to the top end of the footrest portion, and the other end of the seat portion is hinged to the middle and lower sections of the first back rod and the second back rod, and a linkage rod is arranged between the chair back and the footrest portion, one end of the linkage rod is hinged to the middle and upper section of the footrest portion, and the other end of the linkage rod is hinged to the bottom end of the first back rod or the second back rod, so that the chair back, the seat portion, the footrest portion and the linkage rod form a parallelogram-like structure, and the footrest portion and the chair back can be rotated synchronously to be folded or unfolded.

[0013] Furthermore, the folding chair frame includes a chair foot portion and an armrest portion, the chair foot portion is arranged on the left and right sides of the seat portion, the rear end of the armrest portion is hinged to the chair back portion, the chair foot portion includes a front supporting foot and a rear supporting foot, the top ends of the front supporting foot and the rear supporting foot are hinged together on the same central axis, and an adjustment guide rail is also provided on the armrest portion, and a plurality of gear slots are opened on the adjustment guide rail, and the armrest portion can cooperate with different gear slots through the central axis and thus move forward and backward to drive the chair back portion to rotate, fold or unfold.

[0014] Furthermore, the front supporting foot is hinged to the seat portion, and a sliding sleeve is provided on the rear supporting foot. The sliding sleeve can be movably arranged on the rear supporting foot and is hinged to the seat portion. When the rear supporting foot and the seat portion rotate relative to each other, the sliding sleeve can synchronously move up and down along the rear supporting foot. A limiting sleeve is also provided on the rear supporting foot, and the limiting sleeve is fixedly arranged on the rear supporting foot. The limiting sleeve is suitable for limiting the upward movement range of the sliding sleeve.

[0015] Furthermore, a second folding component is provided on the footrest, and the second folding component is suitable for folding or unfolding so that the footrest can be folded or unfolded in the left and right direction. A third folding component is provided between the chair foot and the seat part, and the third folding component is suitable for folding or unfolding so that the chair foot and the seat part can be folded or unfolded in the left and right direction.

[0016] Another aspect of the present application provides a folding chair, comprising the above-mentioned folding chair frame and a chair cloth detachably mounted on the folding chair frame.

[0017] Compared with the prior art, the beneficial effects of this application are:

[0018] In the backrest of the folding chair frame of the present application, an upper folding unit and a lower folding unit are arranged between the first back rod and the second back rod, and a first longitudinal rod and a second longitudinal rod are arranged between the upper folding unit and the lower folding unit. The first longitudinal rod and the second longitudinal rod are suitable for linking the upper folding unit and the lower folding unit. When the upper folding unit and the lower folding unit can be rotated to fold or unfold so that the first back rod and the second back rod are closer to or farther away from each other, the first longitudinal rod and the second longitudinal rod can make the upper folding unit and the lower folding unit rotate synchronously, thereby ensuring the smoothness and stability of the folding and unfolding process of the chair back and avoiding jamming during the folding and unfolding process; at the same time, the first longitudinal rod and the second longitudinal rod can also connect the upper folding unit and the lower folding unit when the chair back is in the maximum unfolded state, which can improve the structural stability and reliability of the chair back. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the folding chair of the present application when it is unfolded.

[0020] Figure 2 This is a schematic diagram of the structure of the folding chair frame of this application when it is unfolded.

[0021] Figure 3 A side view of the folding chair frame of the present application.

[0022] Figure 4 This is a schematic diagram of the structure of the folding chair frame of the present application when the chair back is unfolded.

[0023] Figure 5 This is a schematic diagram of the structure of the folding chair frame of the present application when the chair back is folded.

[0024] Figure 6 This is a schematic diagram of the structure of the footrest in the folding chair frame of this application.

[0025] Figure 7 This is an enlarged schematic diagram of the armrest portion of the folding chair frame of the present application.

[0026] Figure 8 This is a schematic diagram of the structure of the folded chair frame of the present application.

[0027] In the figure: 100, seat portion; 110, first seat rod; 120, second seat rod; 200, back of chair; 210, first folding assembly; 211, upper folding unit; 2111, first crossbar; 2112, second crossbar; 2113, upper folding seat; 2114, first position limiting portion; 212, lower folding unit; 2121, third crossbar; 2122, fourth crossbar; 2123, lower folding seat; 2124, second position limiting portion; 213, first longitudinal rod; 214, second longitudinal rod; 220, first back rod; 230, second back rod; 300, footrest; 310, The second folding component; 311, the first rotating rod; 312, the second rotating rod; 313, the rotating seat; 320, the first footrest rod; 330, the second footrest rod; 400, the chair foot; 410, the front supporting foot; 411, the first front supporting foot; 412, the second front supporting foot; 420, the rear supporting foot; 421, the sliding sleeve; 422, the fixed sleeve; 430, the central axis; 500, the linkage rod; 600, the armrest; 610, the adjustment guide rail; 620, the gear slot; 700, the third folding component; 710, the first cross rod; 720, the second cross rod; 800, the seat structure. DETAILED DESCRIPTION

[0028] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0029] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.

[0030] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0031] The terms "including" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0032] like Figure 2-8 As shown, the present application provides a folding chair frame, comprising:

[0033] A seat portion 100;

[0034] A chair back 200, the chair back 200 is hinged to the rear end of the seat portion 100, and a first folding assembly 210 is disposed on the chair back 200, and the first folding assembly 210 is suitable for folding or unfolding so that the chair back 200 can be folded or unfolded in the left-right direction;

[0035] A footrest 300, the footrest 300 is hinged to the front end of the seat 100, and a second folding assembly 310 is provided on the footrest 300, and the second folding assembly 310 is suitable for folding or unfolding so that the footrest 300 can be folded or unfolded in the left and right directions;

[0036] The chair foot 400 is hinged to the left and right sides of the seat 100, and a third folding component 700 is arranged between the chair foot 400 and the seat 100. The third folding component 700 is suitable for folding or unfolding so that the seat 100 and the chair foot 400 can be folded or unfolded in the left and right directions.

[0037] like Figure 4-5 As shown, the chair back 200 includes two first back bars 220 and second back bars 230 extending up and down and spaced apart from each other left and right, the first back bars 220 and second back bars 230 are both hinged at the rear end of the seat portion 100, the first folding assembly 210 is arranged between the first back bars 220 and second back bars 230, the first folding assembly 210 includes an upper folding unit 211 and a lower folding unit 212 spaced apart from each other up and down, a first longitudinal bar 213 and a second longitudinal bar 214 are hinged between the upper folding units 211 and the upper folding units 211, the first longitudinal bar 213 and the second longitudinal bar 214 are suitable for making the upper folding unit 211 and the lower folding unit 212 fold or unfold synchronously, and during the folding and unfolding process of the upper folding unit 211 and the lower folding unit 212, the first longitudinal bar 213 and the second longitudinal bar 214 are always arranged in parallel. The upper folding unit 211 and the lower folding unit 212 are linked by the first longitudinal rod 213 and the second longitudinal rod 214 to ensure smooth folding or unfolding of the chair back 200 and avoid jamming during the folding or unfolding process.

[0038] Specifically, the upper connecting unit includes an upper folding seat 2113, a first cross bar 2111 and a second cross bar 2112, one end of the first cross bar 2111 is hinged to the first back bar 220, the other end of the first cross bar 2111 is hinged to the upper folding seat 2113, one end of the second cross bar 2112 is hinged to the second back bar 230, and the other end of the second cross bar 2112 is hinged to the upper folding seat 2113, so that the first cross bar 2111 and the second cross bar 2112 are symmetrically arranged on both sides of the upper folding seat 2113. The lower connecting unit includes a lower folding seat 2123, a third cross bar 2121 and a fourth cross bar 2122, one end of the third cross bar 2121 is hinged to the first back bar 220, the other end of the third cross bar 2121 is hinged to the lower folding seat 2123, one end of the fourth cross bar 2122 is hinged to the second back bar 230, and the other end of the fourth cross bar 2122 is hinged to the lower folding seat 2123, so that the third cross bar 2121 and the fourth cross bar 2122 are symmetrically arranged at the two ends of the lower folding seat 2123. The first cross bar 2111 and the second cross bar 2112, the third cross bar 2121 and the fourth cross bar 2122 can be rotated inwards to get closer or rotated outwards to unfold relative to the upper folding seat 2113 and the lower folding seat 2123, respectively, so that the first back bar 220 and the second back bar 230 are closer or farther away from each other, so as to realize the folding and unfolding of the chair back 200 in the left and right directions.

[0039] Furthermore, the two ends of the first longitudinal rod 213 are respectively hinged to the first cross bar 2111 and the third cross bar 2121, and the two ends of the second longitudinal rod 214 are respectively hinged to the second cross bar 2112 and the fourth cross bar 2122. The first longitudinal rod 213 is suitable for linking the first cross bar 2111 and the third cross bar 2121, and the second longitudinal rod 214 is suitable for linking the second cross bar 2112 and the fourth cross bar 2122. The first longitudinal rod 213 and the second longitudinal rod 214 are arranged in the vertical direction, and during the unfolding and folding process, the first longitudinal rod 213 and the second longitudinal rod 214 remain parallel. When the first cross bar 2111 is folded or rotated outward relative to the upper folding seat 2113, the first cross bar 2111 can drive the third cross bar 2121 to be folded or rotated inward relative to the lower folding seat 2123 through the first longitudinal bar 213, and the rotation angles of the first cross bar 2111 and the second cross bar 2112 are also the same. Similarly, when the second cross bar 2112 is folded or rotated outward relative to the upper folding seat 2113, the second cross bar 2112 can drive the fourth cross bar 2122 to be folded or rotated inward relative to the lower folding seat 2123 through the second longitudinal bar 214, and the rotation angles of the second cross bar 2112 and the fourth cross bar 2122 are also the same. Therefore, during the folding and unfolding process of the chair back 200, the first back bar 220 and the second back bar 230 are folded or unfolded in parallel, thereby ensuring the smoothness and stability of the folding and unfolding of the chair back 200.

[0040] In addition, in some preferred embodiments, the hinge point of the first cross bar 2111 and the first longitudinal bar 213 and the hinge point of the second cross bar 2112 and the second longitudinal bar 214 are respectively located at one end of the first cross bar 2111 and the second cross bar 2112 close to the upper folding seat 2113, the hinge point of the third cross bar 2121 and the first longitudinal bar 213 and the hinge point of the fourth cross bar 2122 and the second longitudinal bar 214 are respectively located at one end of the third cross bar 2121 and the fourth cross bar 2122 close to the lower folding seat 2123, that is, the first longitudinal bar 213 and the first back bar 220 are spaced apart, and the second longitudinal bar 214 and the second back bar 230 are spaced apart. Based on the above structure, the first back bar 220, the first cross bar 2111, the first longitudinal bar 213 and the third cross bar 2121 form a parallelogram structure, and the second back bar 230, the second cross bar 2112, the second longitudinal bar 214 and the fourth cross bar 2122 also form a parallelogram structure, thereby further ensuring the smoothness and stability of the chair back 200 when folding and unfolding.

[0041] Both ends of the upper folding seat 2113 extend outward to form a first limiting portion 2114, which is suitable for abutting against the first cross bar 2111 and the second cross bar 2112 to limit the maximum unfolding position of the first cross bar 2111 and the second cross bar 2112, so as to prevent the first cross bar 2111 and the second cross bar 2112 from further rotating outward after reaching the maximum unfolding position. When the upper folding unit 211 is in the maximum unfolding state, the first cross bar 2111 and the second cross bar 2112 are in a horizontal setting state; Both ends of the lower folding seat 2123 extend outward to form a second limiting portion 2124, and the second limiting portion 2124 is suitable for abutting against the third cross bar 2121 and the fourth cross bar 2122 to limit the maximum unfolded position of the third cross bar 2121 and the fourth cross bar 2122 to prevent the third cross bar 2121 and the fourth cross bar 2122 from further rotating outward after reaching the maximum unfolded position. When the lower folding unit 212 is in the maximum unfolded state, the third cross bar 2121 and the fourth cross bar 2122 are in a horizontally set state. When the chair back 200 is unfolded, the first cross bar 2111, the second cross bar 2112, the third cross bar 2121 and the fourth cross bar 2122 are all in a horizontal setting state, and the first longitudinal bar 213 and the second longitudinal bar 214 are in a vertical setting state, so that the first folding component 210 forms an I-shaped structure between the first back bar 220 and the second back bar 230. The I-shaped structure can improve the structural strength of the chair back 200 after it is unfolded, improve the load-bearing capacity of the folding chair, and avoid damage to the chair back 200 during use.

[0042] Furthermore, if Figure 2-3As shown, a linkage rod 500 is further provided between the chair back 200 and the footrest 300, and the linkage rod 500 is suitable for making the chair back 200 and the footrest 300 rotate and expand or rotate and retract synchronously. Specifically, the front end of the seat 100 is hinged to the top of the footrest 300, the rear end of the seat 100 is hinged to the middle and lower sections of the first back rod 220 and the second back rod 230, the front end of the linkage rod 500 is hinged to the middle and upper section of the footrest 300, and the rear end of the linkage rod 500 is hinged to the bottom end of the first back rod 220 or the second back rod 230, so that the chair back 200, the seat 100, the footrest 300 and the linkage rod 500 also form a parallelogram structure, so that the footrest 300 and the chair back 200 can rotate synchronously in the same direction. Through the above structure, the footrest 300 and the chair back 200 are reliably linked. When the chair back 200 rotates backward, the footrest 300 extends forward to form a "lying posture"; when the chair back 200 rotates forward, the footrest 300 retracts backward to form a "sitting posture".

[0043] The folding chair frame also includes an armrest 600, the rear end of which is hinged to the backrest 200, and the foot 400 includes a front support foot 410 and a rear support foot 420, the top ends of which are hinged to the same central axis 430, and an adjustment rail 610 is also provided on the armrest 600, and a plurality of gear slots 620 are provided on the adjustment rail 610, and the armrest 600 can move in the front-to-back direction by cooperating with different gear slots 620 through the central axis 430. Since the rear end of the armrest 600 is hinged to the backrest 200, the movement of the armrest 600 in the front-to-back direction can drive the backrest 200 to rotate forward and close or rotate backward and expand, and the backrest 200 is also arranged in linkage with the footrest 300, so that the user only needs to adjust the central axis 430 to be embedded in different gear slots 620 to adjust the inclination angle of the backrest 200 and the footrest 300.

[0044] The front support leg 410 and the rear support leg 420 are both hinged to the seat portion 100, so that the seat portion 400 and the seat portion 100 can be folded in the front-back direction. Specifically, the tops of the front support leg 410 and the rear support leg 420 are hinged to the same central axis 430, the front support leg 410 is hinged to the seat portion 100, and the rear support leg 420 is provided with a sliding sleeve 421, which is slidably arranged on the rear support leg 420 and hinged to the seat portion 100, and the rear support leg 420 is hinged to the seat portion 100 through the sliding sleeve 421, so that the seat portion 100 can be rotated, folded or unfolded relative to the seat leg 400. When the seat 100 rotates and folds, the sliding sleeve 421 will slide down along the rear support leg 420 synchronously, so that the seat 100 and the back 200 are close to each other, and when the seat 100 rotates and unfolds, the sliding sleeve 421 will slide upward along the rear support leg 420 synchronously, so that the seat 100 and the back 200 are spread apart from each other. A limiting sleeve is also provided on the rear support leg 420, and the limiting sleeve is fixedly provided on the rear support leg 420. When the folding chair frame is unfolded, the fixed sleeve 422 and the sliding sleeve 421 abut against each other to limit the sliding sleeve 421 from moving upward further, so that the seat 100 is kept in the maximum unfolded position, thereby improving the stability of the folding chair frame.

[0045] like Figure 6 As shown, the footrest portion 300 includes a first footrest rod 320 and a second footrest rod 330, the second folding component 310 is arranged between the first footrest rod 320 and the second footrest rod 330, the second folding component 310 includes a first rotating rod 311, a second rotating rod 312 and a rotating seat 313, one end of the first rotating rod 311 is hinged to the first footrest rod 320, one end of the second rotating rod 312 is hinged to the second footrest rod 330, the other ends of the first rotating rod 311 and the second rotating rod 312 are both hinged to the rotating seat 313, the first rotating rod 311 and the second rotating rod 312 can be relatively rotated and folded, so that the first footrest rod 320 and the second footrest rod 330 are close to each other, so as to realize the folding of the footrest portion 300 in the left and right directions.

[0046] like Figure 2 As shown, the chair foot portion 400 includes a front supporting foot 410, and the front supporting foot 410 includes a first front supporting foot 411 and a second front supporting foot 412. The seat portion 100 includes a first seat rod 110 and a second seat rod 120. The third folding component 700 includes a first cross rod 710 and a second cross rod 720. The first cross rod 710 and the second cross rod 720 are cross-hinged with each other. One end of the first cross rod 710 is hinged to the first seat rod 110, and the other end is hinged to the second front supporting foot 412. One end of the second cross rod 720 is hinged to the second seat rod 120, and the other end is hinged to the first front supporting foot 411. The first cross rod 710 and the second cross rod 720 are relatively rotated and folded, so that the chair foot portion 400 and the seat portion 100 can be folded in the left and right directions.

[0047] like Figure 1 As shown, the present application also provides a folding chair, comprising the above-mentioned folding chair frame and a seat structure 800 detachably mounted on the folding chair frame.

[0048] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A folding chair frame, characterized in that: The invention comprises a seat portion and a back portion, wherein the back portion comprises a first back rod and a second back rod extending up and down and spaced apart from each other left and right, wherein the first back rod and the second back rod are respectively hinged at the rear end of the seat portion, wherein a first folding assembly is hinged between the first back rod and the second back rod, wherein the first folding assembly comprises an upper folding unit and a lower folding unit spaced apart from each other up and down, wherein a first longitudinal rod and a second longitudinal rod are further hinged between the upper folding unit and the lower folding unit, wherein the first longitudinal rod and the second longitudinal rod are suitable for folding or unfolding the upper folding unit and the lower folding unit synchronously, and wherein during the folding or unfolding process of the upper folding unit and the lower folding unit, the first longitudinal rod and the second longitudinal rod are always arranged in parallel.

2. The folding chair frame according to claim 1, characterized in that: The upper folding unit includes an upper folding seat, a first cross bar and a second cross bar, one end of the first cross bar is hinged to the first back bar, one end of the second cross bar is hinged to the second back bar, and the other ends of the first cross bar and the second cross bar are hinged to the upper folding seat, so that the first cross bar and the second cross bar are symmetrically arranged at the two ends of the upper folding seat; the lower folding unit includes a lower folding seat, a third cross bar and a fourth cross bar, one end of the third cross bar is hinged to the first back bar, one end of the fourth cross bar is hinged to the second back bar, and the other ends of the third cross bar and the fourth cross bar are hinged to the lower folding seat, so that the third cross bar and the fourth cross bar are symmetrically arranged at the two ends of the lower folding seat.

3. The folding chair frame according to claim 2, characterized in that: The two ends of the first longitudinal rod are respectively hinged to the first cross rod and the third cross rod, and the first longitudinal rod is suitable for making the first cross rod and the third cross rod synchronously rotate, fold or unfold; the two ends of the second longitudinal rod are respectively hinged to the second cross rod and the fourth cross rod, and the second longitudinal rod is suitable for making the second cross rod and the fourth cross rod synchronously rotate, fold or unfold, and the first longitudinal rod and the second longitudinal rod are arranged in the vertical direction. During the process of rotating, folding or unfolding the first cross rod, the second cross rod, the third cross rod and the fourth cross rod, the first longitudinal rod and the second longitudinal rod are always arranged in the vertical direction and the two remain parallel.

4. The folding chair frame according to claim 3, characterized in that: The hinge point between the first cross bar and the first longitudinal bar and the hinge point between the second cross bar and the second longitudinal bar are respectively located at one end of the first cross bar and the second cross bar close to the upper folding seat; the hinge point between the third cross bar and the first longitudinal bar and the hinge point between the fourth cross bar and the second longitudinal bar are respectively located at one end of the third cross bar and the fourth cross bar close to the lower folding seat.

5. The folding chair frame according to claim 3, characterized in that: The two ends of the upper folding seat extend outward to form a first limiting portion, which is suitable for abutting against the first cross bar and the second cross bar to limit the maximum unfolding position of the first cross bar and the second cross bar, so that when the upper folding unit is in the maximum unfolding state, the first cross bar and the second cross bar are in a horizontal setting state; the two ends of the lower folding seat extend outward to form a second limiting portion, which is suitable for abutting against the third cross bar and the fourth cross bar to limit the maximum unfolding position of the third cross bar and the fourth cross bar, so that when the lower folding unit is in the maximum unfolding state, the third cross bar and the fourth cross bar are in a horizontal setting state.

6. The folding chair frame according to any one of claims 1 to 5, characterized in that: The folding chair frame also includes a footrest portion hinged to the front end of the seat portion, one end of the seat portion is hinged to the top end of the footrest portion, and the other end of the seat portion is hinged to the middle and lower sections of the first back rod and the second back rod, and a linkage rod is arranged between the chair back and the footrest portion, one end of the linkage rod is hinged to the middle and upper section of the footrest portion, and the other end of the linkage rod is hinged to the bottom end of the first back rod or the second back rod, so that the chair back, the seat portion, the footrest portion and the linkage rod form a parallelogram-like structure, and the footrest portion and the chair back can be rotated synchronously to be folded or unfolded.

7. The folding chair frame according to claim 6, characterized in that: The folding chair frame includes a chair foot portion and an armrest portion, the chair foot portion is arranged on the left and right sides of the chair seat portion, the rear end of the armrest portion is hinged to the chair back portion, the chair foot portion includes a front supporting foot and a rear supporting foot, the top ends of the front supporting foot and the rear supporting foot are hinged together on the same central axis, and an adjustment guide rail is also provided on the armrest portion, and a plurality of gear slots are opened on the adjustment guide rail. The armrest portion can cooperate with different gear slots through the central axis and thus move forward and backward to drive the chair back portion to rotate, fold or unfold.

8. The folding chair frame according to claim 7, characterized in that: The front supporting foot is hinged to the seat portion, and a sliding sleeve is provided on the rear supporting foot. The sliding sleeve can be movably arranged on the rear supporting foot and is hinged to the seat portion. When the rear supporting foot and the seat portion rotate relatively, the sliding sleeve can synchronously move up and down along the rear supporting foot. A limiting sleeve is also provided on the rear supporting foot, and the limiting sleeve is fixedly arranged on the rear supporting foot. The limiting sleeve is suitable for limiting the upward movement range of the sliding sleeve.

9. The folding chair frame according to claim 8, characterized in that: A second folding component is arranged on the footrest, and the second folding component is suitable for folding or unfolding so that the footrest can be folded or unfolded in the left and right directions. A third folding component is arranged between the chair foot and the seat part, and the third folding component is suitable for folding or unfolding so that the chair foot and the seat part can be folded or unfolded in the left and right directions.

10. A folding chair, characterized in that: It comprises a folding chair frame as described in any one of claims 1 to 9 and a chair cloth detachably mounted on the folding chair frame.

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