Height adjustable folding chair

Abstract

The present application discloses a height-adjustable folding chair, comprising a first support, a second support and a seat cushion plate, wherein the middle section of the first support is connected to the middle section of the second support via a hinge shaft, both the lower section of the first support and the lower section of the second support are provided with a certain bending angle, both ends of the seat cushion plate are fixed to the upper cross rod of the first support and the upper cross rod of the second support respectively in a shaft connection mode, the seat cushion plate has an A-side and a B-side, and after the first support and the second support are unfolded in an X-shape, the bending section of the first support and the bending section of the second support are bent towards each other (in this case, the B-side of the seat cushion plate faces up) or bent back to back (in this case, the A-side of the seat cushion plate faces up). Compared with existing height-adjustable folding chairs, this chair can achieve height adjustment and different selection of A and B sides of the seat cushion plate simply by setting the support at a certain bending angle, eliminating the need for specialized adjustment structures, thereby making the structure simpler and the production cost lower.

Description

[Technical Field]

[0001] This application claims priority to a Chinese patent application entitled "Height-Adjustable Folding Chair" filed with the China Patent Office on November 3, 2022, application number CN202211373752.3, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the field of furniture, and in particular to height-adjustable folding chairs. [Background technology]

[0003] Folding chairs are an essential piece of furniture in modern life. Currently, there are various types of folding chairs on the market, and various products can be selected depending on the user's height and preferences, the environment in which they are used, the season in which they are used, etc. To improve applicability, enable folding chairs to meet the needs of users of various heights, and realize multiple uses (at least two uses) with a single chair, folding chairs with height adjustment functions have emerged. These folding chairs are equipped with specialized height adjustment mechanisms. Although the structure is not complicated, the added height adjustment mechanism increases the cost of these folding chairs. Therefore, there is an urgent need for a folding chair with a simpler structure that can adjust the height without the need for specialized height adjustment mechanisms, thereby reducing production costs. Summary of the Invention [Problem to be solved by the invention]

[0004] Therefore, the present application provides a height-adjustable folding chair to solve the technical problems that the existing height-adjustable folding chairs are provided with specialized height adjustment mechanisms, which result in a relatively complicated structure and a relatively high coast. [Means for solving the problem]

[0005] To achieve the above objectives, the present application provides the following technical solutions:

[0006] A height-adjustable folding chair, comprising: a first support, a second support, and a seat cushion plate; a middle section of the first support is connected to the middle section of the second support via a hinge shaft; both the lower section of the first support and the lower section of the second support are provided with a certain bending angle; both ends of the seat cushion plate are fixed to the upper cross rod of the first support and the upper cross rod of the second support, respectively, in a shaft connection mode; the seat cushion plate has an A-side and a B-side opposite to the A-side; after the first support and the second support are unfolded in an X-shape, the bending section of the first support and the bending section of the second support bend towards each other, in which case the B-side of the seat cushion plate faces upward; or the bending section of the first support and the bending section of the second support bend back to back, in which case the A-side of the seat cushion plate faces upward.

[0007] Optionally, the seat cushion plate is a soft seat cushion plate, and the soft seat cushion plate includes two cylindrical bodies and a soft connecting body, and the two cylindrical bodies are respectively fixed to the upper cross rod of the first support and the upper cross rod of the second support in a shaft connection mode, and both ends of the soft connecting body are respectively connected to the two cylindrical bodies.

[0008] Optionally, the seat cushion plate is a hinged seat cushion plate, and the hinged seat cushion plate includes a front gasket and a rear gasket, the front end of the front gasket is fixed to the upper cross rod of the first support in a shaft connecting mode, and the rear end of the rear gasket is fixed to the upper cross rod of the second support in a shaft connecting mode, and the rear end of the front gasket and the front end of the rear gasket have mutually interlocking Great Wall tooth shapes, and the interlocking positions are connected via a lateral hinge shaft.

[0009] Optionally, the seat cushion plate is a sliding type seat cushion plate, and the sliding type seat cushion plate is a hard plate, and a front side of the sliding type seat cushion plate is provided with a strip hole that slides with the upper cross rod of the first support and is fixed in a shaft connection mode, and a rear end of the sliding type seat cushion plate is provided with a round hole that is fixed in a shaft connection mode with the upper cross rod of the second support.

[0010] Optionally, the first support includes two parallel first support connecting rods and an upper cross rod of the first support, the first support connecting rod includes a first support first connecting rod and a first support second connecting rod, both ends of the upper cross rod of the first support are respectively connected to the upper ends of the two first support first connecting rods, the lower section of the first support first connecting rod is movably inserted into the upper end of the first support second connecting rod, one pin hole is provided on the side of the lower end of the first support first connecting rod, and two pin holes are provided on the side of the inserted section of the first support second connecting rod, and the relative positions of the first support first connecting rod and the first support second connecting rod are fixed by inserting pin shafts into the corresponding pin holes.

[0011] Optionally, the second support includes two parallel second support connecting rods and an upper cross rod of the second support, the second support connecting rod includes a second support first connecting rod and a second support second connecting rod, both ends of the upper cross rod of the second support are respectively connected to the upper ends of the two second support first connecting rods, the lower section of the second support first connecting rod is movably inserted into the upper ends of the second support second connecting rod, a strip hole is provided on the side of the insertion section of the second support first connecting rod, a pin hole is provided on the side of the upper end of the second support second connecting rod, and a pin shaft passing through the strip hole is provided in the pin hole.

[0012] Optionally, the second support includes two second support connecting rods, two fixing sleeves, and one upper cross rod of the second support, the two second support connecting rods are arranged in parallel, the two fixing sleeves are respectively fixed to both ends of the upper cross rod of the second support, and the two fixing sleeves are respectively slidably nested on the upper ends of the two second support connecting rods, and a fixing point is provided on the upper end of the second support connecting rod to prevent the fixing sleeve from sliding down and ensure the lowest position of the fixing sleeve.

[0013] Optionally, the height-adjustable folding chair further includes a back support and a back fixing plate, wherein the lower end of the back support is fixed to the upper section of the second support in a shaft connection mode, and a latch point is provided above the second support at the hinge with the back support, and one end of the back fixing plate is fixed to the lower section of the back support in a shaft connection mode, and the other end of the back fixing plate is provided with a locking hole used to align with the latch point.

[0014] Optionally, the height-adjustable folding chair further includes a handrail support and a backrest support, wherein the lower end of the handrail support is fixed to the upper end of the first support in a shaft connection mode, the upper end of the backrest support is fixed to the upper end of the handrail support in a shaft connection mode, the upper end of the second support is provided with a latch point, and the lower end of the backrest support is provided with a locking hole that is used to match the latch point. [Effects of the Invention]

[0015] The present application has the following advantages:

[0016] After the two supports are unfolded in an X-shape, the seat cushion plate also unfolds to prevent the two supports from unfolding excessively. The seat cushion plate functions as a seat that supports pressure on the buttocks, and the two supports function as legs that support the seat. The lower sections of the two supports are set at a certain bending angle. When the bending sections of the two supports are bent back to back during unfolding, the legs of the chair formed by the supports are lowered, thereby lowering the height of the seat cushion plate and forming a low-position folding chair (in this case, side A of the seat cushion plate faces upward). When the bending sections of the two supports are bent toward each other during unfolding, the legs of the chair formed by the supports are raised, thereby raising the height of the seat cushion plate and forming a high-position folding chair (in this case, side B of the seat cushion plate faces upward). Compared to existing height-adjustable folding chairs, this chair achieves height adjustment by simply setting the supports at a certain bending angle, while also enabling the conversion of side A and side B of the seat cushion plate. This eliminates the need for specialized adjustment mechanisms, making the construction simpler and reducing the production cost. [Brief explanation of the drawings]

[0017] In order to more clearly describe the embodiments of the present application or the technical solutions of the prior art, the following briefly introduces the accompanying drawings necessary for describing the embodiments or the prior art. Obviously, the drawings in the following description are merely examples, and those skilled in the art can derive other implementation drawings from the provided drawings without paying compensation for creative activities.

[0018] The structures, ratios, sizes, etc. shown in this specification are used in the field to be consistent with the contents disclosed in the specification so that a person familiar with the art can understand and read them, and are not used to limit the conditions that can be implemented in this application. Therefore, there is no technical substantive meaning, and any structural modifications, changes in ratio relationships, or size adjustments may be made without affecting the effect and purpose of this application, and are considered to be included in the scope covered by the technical contents disclosed in this application.

[0019] [Figure 1] FIG. 1 is a structural schematic diagram of the height-adjustable folding chair provided by Example 1 when it is in a low position. [Figure 2] FIG. 1 is a structural schematic diagram of the height-adjustable folding chair provided by Example 1 when it is in a high position. [Figure 3] 1 is a structural schematic diagram of the height-adjustable folding chair provided by Example 1 when folded; FIG. [Figure 4] FIG. 2 is an exploded view of the height-adjustable folding chair provided by Example 1, with the soft seat cushion plate in a low position. [Figure 5] FIG. 1 is a structural schematic diagram of a height-adjustable folding chair using a hinged seat cushion plate provided by Example 1. [Figure 6] FIG. 1 is an exploded view of a height-adjustable folding chair using a hinged seat cushion plate provided by Example 1. [Figure 7] 1 is a structural schematic diagram of a height-adjustable folding chair using a sliding seat cushion plate provided by Example 1. [Figure 8] FIG. 1 is an exploded view of a height-adjustable folding chair using a sliding seat cushion plate provided by Example 1. [Figure 9] FIG. 10 is a structural schematic diagram of the height-adjustable folding chair provided by Example 2 when it is in a low position. [Figure 10] FIG. 10 is an exploded view of the height-adjustable folding chair provided by Example 2 when it is in a low position. [Figure 11] FIG. 10 is a structural schematic diagram of the height-adjustable folding chair provided by Example 3 when it is in a low position. [Figure 12] FIG. 10 is an exploded view of the height-adjustable folding chair provided by Example 3 when it is in a low position. [Figure 13] FIG. 10 is a structural schematic diagram of the height-adjustable folding chair provided by Example 4 when it is in a low position. [Figure 14] FIG. 10 is an exploded view of the height-adjustable folding chair provided by Example 4 when it is in a low position. [Figure 15] FIG. 10 is a structural schematic diagram of the height-adjustable folding chair with backrest provided by Example 5 when it is in a low position. [Figure 16] FIG. 10 is a structural schematic diagram of the height-adjustable folding chair with backrest provided by Example 5 when it is in a high position. [Figure 17] FIG. 10 is an exploded view of the height-adjustable folding chair with backrest provided by Example 5 when it is in a low position. [Figure 18] FIG. 10 is a structural schematic diagram of a height-adjustable folding chair with a backrest and handrails provided by Example 6 when it is in a low position. [Figure 19] FIG. 10 is a structural schematic diagram of a height-adjustable folding chair with a backrest and handrails provided by Example 6 when it is in a high position. [Figure 20]10 is an exploded view of a height-adjustable folding chair with a backrest and handrails provided by Example 6 in a low position. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0020] The following specific examples are provided to illustrate the embodiments of the present application, and those familiar with the art can easily understand other advantages and effects of the present application from the contents disclosed herein. Obviously, the described examples are not all examples, but are a part of the examples of the present application. Based on the examples of the present application, all other examples that a person skilled in the art can obtain without making creative efforts all belong to the protection scope of the present application.

[0021] The terms "upper", "lower", "left", "right", "middle", etc., cited in this specification are used for convenience of explanation only and are not used to limit the applicable scope of the present application, and any change or adjustment of their relative relationships without substantially changing the technical content shall be considered to be within the applicable scope of the present application.

[0022] Example 1 As shown in FIGS. 1 to 4, Example 1 provides a height-adjustable folding chair including a first support 1, a second support 2, and a seat cushion plate 3. The first support 1 and the second support 2 resemble a rectangle, with the first support 1 being slightly smaller and nested within the second support 2, and their middle sections connected via a hinge shaft. The reason they resemble a rectangle is that the lower sections of the first support 1 and the second support 2 both have certain bending angles, e.g., the bending angle of the first support 1 is 29° and the bending angle of the second support 2 is 35°. Both ends of the seat cushion plate 3 are fixed to the upper cross rod 11 of the first support and the upper cross rod 21 of the second support, respectively, in a shaft connection mode. After the first support 1 and the second support 2 are unfolded into an X-shape, the bending sections of the first support 1 and the bending sections of the second support 2 can bend toward each other (also called inward bending) or back to back (also called outward bending).

[0023] As shown in FIG. 4, in an optional solution of this embodiment, the seat cushion plate 3 is a soft seat cushion plate 31, which includes two cylindrical bodies 311 and a soft connecting body 312, and the two cylindrical bodies 311 are respectively fixed to the upper cross rod 11 of the first support and the upper cross rod 21 of the second support in a shaft connection mode, and both ends of the soft connecting body 312 are respectively connected to the two cylindrical bodies 311, where the soft connecting body 312 can be a cloth or a rope net.

[0024] As shown in Figures 5 and 6, in another alternative solution of this embodiment, the seat cushion plate 3 is a hinged seat cushion plate 32, and the hinged seat cushion plate 32 includes a hard front gasket 321 and a rear gasket 322, the front end of the front gasket 321 is fixed to the upper cross rod 11 of the first support in a shaft connection mode, and the rear end of the rear gasket 322 is fixed to the upper cross rod 21 of the second support in a shaft connection mode, and the rear end of the front gasket 321 and the front end of the rear gasket 322 are in the shape of interlocking Great Wall teeth, and the interlocking positions are connected through a lateral hinge shaft.

[0025] As shown in Figures 7 and 8, in another alternative solution of this embodiment, the seat cushion plate 3 is a sliding seat cushion plate 33, which is a hard plate, and the front side of the sliding seat cushion plate 33 is provided with a strip hole 7 that slides with and is fixed to the upper cross rod 11 of the first support in a shaft connection mode, and the rear end of the sliding seat cushion plate 33 is provided with a round hole that is fixed to the upper cross rod 21 of the second support in a shaft connection mode (not shown).

[0026] In this embodiment, the seat cushion plate 3 has two surfaces, a front surface and a rear surface, designated as surface A and surface B. After the two supports are unfolded in an X-shape, the seat cushion plate 3 also unfolds to prevent the two supports from unfolding excessively. The seat cushion plate 3 functions as a seat supporting the pressure of the buttocks, and the two supports function as legs supporting the seat. The lower sections of the two supports are bent at a certain angle, so that when the bent sections of the two supports are bent back to back during unfolding, the legs of the chair formed by the supports become lower, thereby lowering the height of the seat cushion plate 3 and forming a low-position folding chair. In this state, surface A of the seat cushion plate 3 faces upward. When the bent sections of the two supports are bent toward each other during unfolding, the legs of the chair formed by the supports become higher, thereby raising the height of the seat cushion plate 3 and forming a high-position folding chair. In this state, surface B of the seat cushion plate 3 faces upward. Compared with existing height-adjustable folding chairs, height adjustment can be achieved by simply setting the support at a certain bending angle, and at the same time, conversion between side A and side B of the seat cushion plate 3 can be achieved, eliminating the need for a specialized adjustment structure, thereby making the structure simpler and the production cost lower.

[0027] Example 2 This embodiment is a further improvement based on Embodiment 1. As shown in Figures 9 and 10 , in this embodiment, the first support 1 includes two parallel first support connecting rods 12 and a first support upper cross rod 11, and the first support connecting rod 12 includes a first support first connecting rod 121 and a first support second connecting rod 122, both ends of the first support upper cross rod 11 are respectively connected to the upper ends of the two first support first connecting rods 121, the lower section of the first support first connecting rod 121 is movably inserted into the upper end of the first support second connecting rod 122, a pin hole 8 is provided on the side of the lower end of the first support first connecting rod 121, and a pin hole 8 is provided on the side of the inserted section of the first support second connecting rod 122, and a pin shaft 9 is inserted and disposed in the pin hole 8, thereby fixing the relative positions of the first support first connecting rod 121 and the first support second connecting rod 122.

[0028] By adopting the above design, the pin shaft 9 is pulled out and the first support first connecting rod 121 is inserted one step into the first support second connecting rod 122, thereby lowering the height of the first support connecting rod 12 and allowing the upper cross rod 11 of the first support to pass under the upper cross rod 21 of the second support, thereby realizing the interchange of the positions of the two supports, thereby adjusting the height of the supports and the height of the seat cushion plate 3, and completing the height-adjustable conversion adjustment of the folding chair. After the interchange, the position of the first support first connecting rod 121 is restored and the pin shaft 9 is inserted.

[0029] Example 3 This embodiment is a further improvement based on Embodiment 1. As shown in Figures 11 and 12, in this embodiment, the second support 2 includes two parallel second support connecting rods 22 and a second support upper cross rod 21, and the second support connecting rod 22 includes a second support first connecting rod 221 and a second support second connecting rod 222, both ends of the second support upper cross rod 21 are respectively connected to the upper ends of the two second support first connecting rods 221, the lower section of the second support first connecting rod 221 is movably inserted into the upper ends of the second support second connecting rods 222, a strip hole 7 is provided on the side of the inserted section of the second support first connecting rod 221, a pin hole 8 is provided on the side of the upper end of the second support second connecting rod 222, and a pin shaft 9 passing through the strip hole 7 is provided in the pin hole 8.

[0030] By adopting the above design, the first connecting rod 221 of the second support can be pulled up, allowing the upper cross rod 21 of the second support to pass above the upper cross rod 11 of the first support, thereby realizing the interchange of the positions of the two supports, thereby adjusting the height of the support and the height of the seat cushion plate 3, and completing the height-adjustable conversion adjustment of the folding chair.

[0031] Example 4 This embodiment is a further improvement based on Embodiment 1. As shown in Figures 13 and 14, in this embodiment, the second support 2 includes two second support connecting rods 22, two fixing sleeves 23, and one second support upper cross rod 21, the two second support connecting rods 22 are arranged in parallel, the two fixing sleeves 23 are respectively fixed to both ends of the second support upper cross rod 21, and the two fixing sleeves 23 are respectively slidably nested on the upper ends of the two second support connecting rods 22, and a fixing point 24 is provided on the upper end of the second support connecting rod 22 to prevent the fixing sleeve 23 from sliding down and ensure that the fixing sleeve 23 is located at the lowest point.

[0032] By adopting the above design, the upper cross rod 21 of the second support can be raised to a certain height, so that the upper cross rod 21 of the second support is higher than the upper cross rod 11 of the first support, ensuring that the upper cross rod 11 of the first support passes under the upper cross rod 21 of the second support, thereby realizing the interchange of the positions of the two supports, thereby adjusting the height of the support and the height of the seat cushion plate 3, and completing the height-adjustable conversion adjustment of the folding chair.

[0033] Example 5 This embodiment is further improved based on Embodiment 1. As shown in Figures 15 to 17, in this embodiment, the height-adjustable folding chair further includes a back support 4 and a back fixing plate 5, the lower end of the back support 4 is fixed to the upper section of the second support 2 in a shaft connection mode, a latch point 25 is provided above the second support 2 at the hinge with the back support 4, one end of the back fixing plate 5 is fixed to the lower section of the back support 4 in a shaft connection mode, and the other end of the back fixing plate 5 is provided with a locking hole 10 used to align with the latch point 25.

[0034] According to the above design, the folding chair of the first embodiment can be provided with a folding back support 4 as a backrest, which can enhance the comfort of the user.

[0035] Example 6 This embodiment is a further improvement based on Embodiment 1. As shown in Figures 18 to 20, in this embodiment, the height-adjustable folding chair further includes a handrail support 6 and a backrest support 4, the lower end of the handrail support 6 is fixed to the upper end of the first support 1 in a shaft connection mode, the upper end of the backrest support 4 is fixed to the upper end of the handrail support 6 in a shaft connection mode, a latch point 25 is provided at the upper end of the second support 2, and a locking hole 10 is provided at the lower end of the backrest support 4 to be used in conjunction with the latch point 25.

[0036] With the above design, the folding back support 4 can be added as a backrest to the folding chair of Example 1, and the folding handrail support 6 can be added as a handrail, thereby increasing the comfort of the user.

[0037] In each of the above embodiments, the description is based on the premise that the first support is smaller than the second support, and a person skilled in the art may design the second support to be larger than the second support, which is still within the scope of protection of the present application based on the application concept of the present application.

[0038] Although the present application has been described in detail above using general descriptions and specific examples, some modifications or improvements can be made based on the present application, which will be obvious to those skilled in the art. Therefore, any modifications or improvements made based on not departing from the spirit of the present application shall fall within the protection scope of the present application. [Explanation of symbols]

[0039] 1 - first support, 11 - upper cross rod of the first support, 12 - first support connecting rod, 121 - first support first connecting rod, 122 - first support second connecting rod, 2 - second support, 21 - upper cross rod of the second support, 22 - second support connecting rod, 221 - second support first connecting rod, 222 - second support second connecting rod, 23 - fixing sleeve, 24 - fixing point, 25 - latching point, 3 - seat cushion plate, 31 - soft seat cushion plate, 311 - cylindrical body, 312 - soft connecting body, 32 - hinged seat cushion plate, 321 - front gasket, 322 - rear gasket, 33 - sliding seat cushion plate, 34 - A surface, 35 - B surface, 4 - backrest support, 5 - backrest fixing plate, 6 - handrail support, 7 - strip hole, 8 - pin hole, 9 - pin shaft, 10 - locking hole.

Claims

1. A height-adjustable folding chair, the middle section of the first support is connected to the middle section of the second support via a hinge shaft, both of the lower section of the first support and the lower section of the second support are provided with a certain bending angle, both ends of the seat cushion plate are fixed to the upper cross rod of the first support and the upper cross rod of the second support respectively in a shaft connection mode, the seat cushion plate has an A-side and a B-side opposite to the A-side, after the first support and the second support are unfolded in an X-shape, the bending section of the first support and the bending section of the second support bend towards each other, in which case the B-side of the seat cushion plate faces upward, or the bending section of the first support and the bending section of the second support bend back to back, in which case the A-side of the seat cushion plate faces upward.

2. The seat cushion plate is a soft seat cushion plate, and the soft seat cushion plate includes two cylindrical bodies and a soft connecting body, and the two cylindrical bodies are fixed to the upper cross rod of the first support and the upper cross rod of the second support in a shaft connecting mode, respectively, and both ends of the soft connecting body are connected to the two cylindrical bodies, respectively.

2. The height-adjustable folding chair of claim 1.

3. The seat cushion plate is a hinged seat cushion plate, and the hinged seat cushion plate includes a front gasket and a rear gasket, a front end of the front gasket is fixed to the upper cross rod of the first support in a shaft connecting mode, and a rear end of the rear gasket is fixed to the upper cross rod of the second support in a shaft connecting mode, and the rear end of the front gasket and the front end of the rear gasket have mutually interlocking Great Wall tooth shapes, and the interlocking positions are connected via a lateral hinge shaft.

2. The height-adjustable folding chair of claim 1.

4. The seat cushion plate is a sliding type seat cushion plate, and the sliding type seat cushion plate is a hard plate, and a strip hole is provided at a front side of the sliding type seat cushion plate to slide with the upper cross rod of the first support and to be fixed in a shaft connection mode, and a round hole is provided at a rear end of the sliding type seat cushion plate to be fixed with the upper cross rod of the second support in a shaft connection mode.

2. The height-adjustable folding chair of claim 1.

5. the first support includes two parallel first support connecting rods and an upper cross rod of the first support, the first support connecting rod includes a first support first connecting rod and a first support second connecting rod, both ends of the upper cross rod of the first support are respectively connected to upper ends of the two first support first connecting rods, the lower section of the first support first connecting rod is movably inserted into the upper end of the first support second connecting rod, one pin hole is provided on a side of the lower end of the first support first connecting rod, two pin holes are provided on a side of the inserted section of the first support second connecting rod, and pin shafts are inserted and disposed in the corresponding pin holes, thereby fixing the relative positions of the first support first connecting rod and the first support second connecting rod.

2. The height-adjustable folding chair of claim 1.

6. the second support includes two parallel second support connecting rods and an upper cross rod of the second support, the second support connecting rod includes a second support first connecting rod and a second support second connecting rod, both ends of the upper cross rod of the second support are respectively connected to upper ends of the two second support first connecting rods, the lower section of the second support first connecting rod is movably inserted into the upper ends of the second support second connecting rod, a strip hole is provided on a side of the insertion section of the second support first connecting rod, a pin hole is provided on a side of the upper end of the second support second connecting rod, and a pin shaft passing through the strip hole is provided in the pin hole.

2. The height-adjustable folding chair of claim 1.

7. The second support includes two second support connecting rods, two fixing sleeves, and one upper cross rod of the second support, the two second support connecting rods are arranged in parallel, the two fixing sleeves are fixed to both ends of the upper cross rod of the second support, and the two fixing sleeves are slidably nested on upper ends of the two second support connecting rods, respectively, and a fixing point is provided at the upper end of the second support connecting rod to prevent the fixing sleeve from sliding down and ensure the lowest position of the fixing sleeve.

2. The height-adjustable folding chair of claim 1.

8. The height-adjustable folding chair further includes a back support and a back fixing plate, the lower end of the back support is fixed to the upper section of the second support in a shaft connection mode, a latch point is provided above the second support at the hinge with the back support, one end of the back fixing plate is fixed to the lower section of the back support in a shaft connection mode, and the other end of the back fixing plate is provided with a locking hole used to match the latch point.

2. The height-adjustable folding chair of claim 1.

9. The height-adjustable folding chair further includes a handrail support and a backrest support, wherein a lower end of the handrail support is fixed to an upper end of the first support in a shaft connection mode, an upper end of the backrest support is fixed to an upper end of the handrail support in a shaft connection mode, a latch point is provided at an upper end of the second support, and a locking hole is provided at a lower end of the backrest support to be used in conjunction with the latch point.

2. The height-adjustable folding chair of claim 1.

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