Folding chair with stepless height adjustment

Abstract

This invention provides a folding chair with stepless height adjustment. The folding chair includes a first and a second inclined support and a seat. The first inclined support forms a backrest section. The rear side of the seat is fitted onto the backrest section by cam abutments and C-shaped buckles. Each C-shaped buckle includes a through hole, an abutment against an inner wall, and a notch. Each cam abutment is pivotally mounted at the notch and has a horizontal positioning angle and a tilting release angle. Each cam abutment includes an abutting surface and a yielding side. When the cam abutment is in the horizontal positioning angle, it forms a positioning state in which the abutting surface abuts against the front side of the seat section of the backrest section. When the cam abutment is in the tilting release angle, it forms a yielding side corresponding to the backrest section. At this time, the seat section changes to a state where it can be continuously raised and lowered.

Description

Folding chair with stepless height adjustment Technical Field

[0001] This work relates to a folding chair, specifically a revealer of an innovative folding chair structure with stepless height adjustment. Prior Technology

[0002] In order to meet the seating needs of users of different body types, some companies have developed folding chairs with adjustable seat cushions.

[0003] Currently, the seat height adjustment function is mainly divided into two types: stepped and stepless. Among them, the stepless adjustment type is more popular among consumers because it is more flexible and easier to operate.

[0004] However, the main drawback of the aforementioned stepless adjustment type of folding chair lies in its structural form. It still requires a double-tube parallel backrest structure (see announcement number CN 2362368Y) to achieve the function of seat cushion positioning. As a result, it still suffers from problems and drawbacks such as complex components, high material costs, and the inability to further reduce the weight of folding chairs. Summary of the Invention

[0005] The main purpose of this creation is to provide a folding chair with stepless height adjustment. The technical problem it aims to solve is to innovate and break through the goal of developing a new type of folding chair structure that is more ideal and practical.

[0006] Based on the aforementioned objectives, this invention provides a folding chair with stepless height adjustment. The folding chair includes a first inclined support, a second inclined support, and a seat. The top of the second inclined support is pivotally connected to the middle section of the first inclined support via a movable joint, allowing it to be folded or unfolded. The first inclined support defines a backrest section above the movable joint. The rear side of the seat is fitted onto the backrest section via a cam abutment and a C-shaped buckle. The buckle includes a through hole, an abutment against the inner wall, and a notch. Each cam abutment part is pivotally assembled at the notch by a shaft bolt, and has a horizontal positioning angle and a tilting release angle. The shaft bolt pivot part is eccentrically configured. Each cam abutment part includes an abutting surface and a clearance side with different lateral configurations. The distance from the abutting surface to the shaft bolt pivot part is greater than the distance from the clearance side to the shaft bolt pivot part. When the cam abutment part is in the horizontal positioning angle, the abutting surface abuts against the front side of the backrest section, and the rear side of the backrest section is pressed against the seat part of the inner wall in a positioning state. When the cam abutment part is in the tilting release angle, the clearance side corresponds to the backrest section and creates a gap. At this time, the seat part is released from its positioning state and becomes a stepless height adjustment state.

[0007] By incorporating this innovative structural form and technical features, this invention, compared to previous technologies, allows the seat to achieve stepless height adjustment through the cam abutment and C-shaped buckle. This results in a simpler structure, more stable positioning, and more convenient and faster adjustment, making it a more practical and industrially viable advancement.

[0008] Another objective of this invention is to utilize the concave arc-shaped contour of the inner wall of the C-shaped buckle and the sports field-shaped contour of the backrest section of the first inclined support, which forms two convex arc edges. When the cam abutment is in the horizontal positioning angle, it forms a state in which the two convex arc edges are pressed against the inner wall. This is another technical feature that utilizes the concave arc-shaped inner wall to form a two-point pressure with a guiding effect on the two convex arc edges of the sports field-shaped backrest section, thereby achieving the advantage and practical improvement of obtaining an excellent stable effect at the horizontal positioning angle of the cam abutment.

[0009] Another objective of this invention is to further enhance the friction and stability of the abutment surface against the front of the chair back section by creating a non-slip structure, thereby achieving practical improvements. Simple Explanation of the Diagram

[0010] Figure 1 is a perspective view of a preferred embodiment of the folding chair of this invention. Figure 2 is a partial exploded perspective view of the preferred embodiment of the folding chair of this invention. Figure 3 shows the side of the folding chair in this design with the cam abutment in a horizontal positioning angle. view. Figure 4 is a partial elevation sectional view of the component corresponding to Figure 3. Figure 5 is a cross-sectional view of a partial component corresponding to Figure 4. Figure 6 shows the side of the folding chair in this design with the cam resting part in a tilted release angle. view. Figure 7 is a partial elevation sectional view of the component corresponding to Figure 6. Figure 8 shows an embodiment of the cam abutment surface with an anti-slip structure. Implementation

[0011] Please refer to Figures 1 to 7, which are preferred embodiments of the folding chair with stepless height adjustment function of this invention. However, these embodiments are for illustrative purposes only and are not limited to this structure in the patent application.

[0012] The folding chair includes a first inclined support 10, a second inclined support 20, and a seat 30; wherein the first inclined support 10 and the second inclined support 20 are both of the spaced double-bar type, and the top of the second inclined support 20 is pivotally connected to the middle section of the first inclined support 10 by a movable joint 105, so as to be foldable or unfoldable; the first inclined support 10 defines a backrest section 11 above the movable joint 105; and wherein the rear side of the seat 30 is fitted onto the backrest section 11 by two cam abutment parts 40 and two C-shaped buckles 50, each C-shaped buckle 50 including a through hole 51, an abutment to an inner wall 52, and a notch 53, each cam abutment part 40 is pivotally assembled to the notch 53 by a shaft bolt 60 to have a flat positioning angle. As shown in Figure 4) and a tilt release angle (as shown in Figure 7), the pivot assembly of the shaft bolt 60 is eccentrically configured, and each cam abutment 40 includes an abutment surface 41 and a clearance side 42 with opposite lateral configurations. The distance between the abutment surface 41 and the pivot assembly of the shaft bolt 60 is greater than the distance between the clearance side 42 and the pivot assembly of the shaft bolt 60. When the cam abutment 40 is in the flat positioning angle, the abutment surface 41 abuts against the front side of the backrest section 11, and the rear side of the backrest section 11 abuts against the seat portion 30 of the inner wall 52 in a positioning state (as shown in Figures 4 and 5). When the cam abutment 40 is in the tilt release angle, the clearance side 42 corresponds to the backrest section 11 and creates a gap W (as shown in Figure 7). At this time, the positioning state of the seat portion 30 is released, and it becomes a state that can be continuously raised and lowered.

[0013] As shown in Figure 5, in this example, the inner wall 52 of the C-shaped buckle 50 has a concave arc shape, and the cross-section of the backrest section 11 of the first inclined bracket 10 has a sports field-shaped profile and two convex arc edges 12. When the cam abutment 40 is at the horizontal positioning angle, it is in a state where the two convex arc edges 12 are pressed against the inner wall 52. With the embodiment shown in this example, the two-point pressure type formed by the inner wall 52 of the concave arc shape and the two convex arc edges 12 of the sports field-shaped backrest section 11 can achieve excellent stability at the horizontal positioning angle of the cam abutment 40.

[0014] As shown in Figure 2, in this example, the abutting surface 41 of the cam abutting part 40 is planar, the avoidance side 42 is arc-shaped, and the backrest section 11 of the first inclined bracket 10 is planar in relation to the abutting surface 41.

[0015] As shown in Figure 8, in this example, the abutting surface 41 of the cam abutment 40 is further provided with an anti-slip structure 70. The anti-slip structure 70 includes anti-slip textures, anti-slip patches, etc. The anti-slip structure 70 is mainly used to further increase the friction and stability of the abutting surface 41 against the front side of the chair back section 11.

[0016] As shown in Figure 4, in this example, the bottom of the seat portion 30 is provided with two horizontal support arms 80 arranged at intervals, so that the cam abutment portion 40 is formed at the rear end of each of the horizontal support arms 80.

[0017] Based on the aforementioned structural composition and technical features, the folding chair with stepless height adjustment function disclosed in this invention, as shown in Figures 4 and 5, is in actual use. When the cam abutment part 40 is at the flat positioning angle, the abutment surface 41 abuts against the front side of the backrest section 11, and the rear side of the backrest section 11 is pressed against the seat part 30 of the abutment inner wall 52 in a positioning state. When the cam abutment part 40 is at the tilt release angle, as shown in Figure 6, the clearance side 42 corresponds to the backrest section 11 and a gap W is generated (as shown in Figure 7). At this time, the positioning state of the seat part 30 is released, thereby changing to a state where it can be adjusted steplessly. The positioning technology disclosed in this invention uses a single-bar structure to achieve a stable positioning effect on the backrest section 11 abutted by the abutment surface 41 of each cam abutment part 40. Therefore, the backrest structure can be further simplified, thus achieving many advantages and practical improvements such as simple structure, stable positioning, convenient and quick adjustment operation.

[0018] 10: First inclined support 105: Mobility joints 11: Chair back section 12: Lateral convex arc edge 20: Second inclined support 30: Seat section 40: Cam abutment part 41: Resistance 42: Avoidance side 50: C-ring 51: Through hole 52: Against the inner wall 53: Gap 60: Shaft bolt 70: Anti-slip construction 80: Lateral support arm W: Gap

Claims

1. A folding chair with stepless height adjustment, comprising a first inclined support, a second inclined support, and a seat; wherein the top of the second inclined support is pivotally connected to the middle section of the first inclined support via a movable joint, allowing it to be folded or unfolded; the first inclined support defines a backrest section above the movable joint; and wherein, The rear of the seat is secured to the backrest section by two cam abutments and two C-shaped buckles. The buckle includes a through hole, an abutment against an inner wall, and a notch. Each cam abutment portion is pivotally assembled at the notch by a shaft bolt, having a horizontal positioning angle and a tilting release angle. The shaft bolt pivot portion is eccentrically configured. Each cam abutment portion includes an abutting surface and a clearance side with opposite lateral configurations, such that the distance from the abutting surface to the shaft bolt pivot portion is greater than the distance from the clearance side to the shaft bolt pivot portion. When the cam abutment portion is at the horizontal positioning angle, the abutting surface abuts against the front side of the backrest section, and the rear side of the backrest section abuts against the seat portion of the abutment against the inner wall in a positioning state. When the cam abutment portion is at the tilting release angle, the clearance side corresponds to the backrest section and creates a gap. At this time, the seat portion positioning state is released, and it changes to a stepless height adjustment state.

2. The folding chair with stepless height adjustment function as described in claim 1, wherein the inner wall of the C-shaped buckle has a concave arc shape, and the cross section of the backrest section of the first inclined support has a sports field shape and two convex arc edges; when the cam abutment is at the flat positioning angle, it is in a state in which the two convex arc edges are pressed against the inner wall.

3. A folding chair with stepless height adjustment function as described in claim 1, wherein the abutting surface of the cam abutment is planar, the avoidance side is arc-shaped, and the backrest section of the first inclined bracket is planar in relation to the abutting surface.

4. A folding chair with stepless height adjustment as described in claim 3, wherein the abutting surface of the cam abutment portion is further formed with an anti-slip structure.

5. A folding chair with stepless height adjustment as described in claim 1, wherein the bottom of the seat is provided with two spaced-apart transverse arms such that the cam abutment is formed at the rear end of each transverse arm.

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