A folding chair

Abstract

The utility model discloses a folding chair, including backrest pipe, seat pipe, front leg pipe, rear leg pipe, handrail, backrest limiting pipe and self -locking subassembly, the front end articulation of backrest limiting pipe is in the articulation department of seat pipe and front leg pipe, the rear end articulation of backrest limiting pipe is in the middle part or lower part of backrest pipe, and rear leg pipe and backrest pipe all are linked with self -locking subassembly. Folding chair is automatically locked through self -locking subassembly after unfolding, and avoids automatic folding.

Description

Technical Field

[0001] This utility model relates to the field of folding chairs, specifically to a folding chair. Background Technology

[0002] Folding chairs are lightweight, stackable seats that are easy to move and save space, making them a popular choice for outdoor leisure activities. However, existing folding chairs typically cannot lock the unfolded frame, and they tend to fold automatically when moved, which is inconvenient. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a folding chair that automatically locks itself after unfolding to prevent it from folding automatically.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution: This utility model provides a folding chair, including a backrest tube, a seat tube, a front leg tube, a rear leg tube, and armrests, and also includes a backrest limiting tube and a self-locking component; The rear leg tube is hinged to the middle or rear of the seat tube; The front end of the backrest limiting tube is hinged to the hinge joint between the seat tube and the front leg tube, and the rear end of the backrest limiting tube is hinged to the middle or lower part of the backrest tube. The top of the front leg tube is hinged to the front end of the armrest, and the rear end of the armrest is hinged to the backrest tube. The self-locking assembly includes a limiting sleeve and a limiting piece; The limiting sleeve is slidably fitted onto the rear end of the seat tube; One end of the limiting piece is hinged to the limiting sliding sleeve, and the other end is hinged to the rear leg tube and the backrest tube via a folding chair. The rear end of the seat tube is provided with a ball bearing, and the limiting slide sleeve is provided with a ball bearing positioning hole that cooperates with the ball bearing; when the ball bearing is inserted into the ball bearing positioning hole, the limiting slide sleeve is fixed relative to the seat tube.

[0005] Furthermore, the self-locking component also includes a button, which is hinged to the limiting sleeve and located above the ball; when the button is pressed, the button contacts the ball and forces the ball to disengage from the ball positioning hole.

[0006] As a preferred embodiment, the upper surface of the button is provided with anti-slip texture; and / or, the lower surface of the button is provided with a pressing post, which contacts the ball when the button is pressed to push the ball away from the ball positioning hole.

[0007] Furthermore, the rear leg tube is provided with a first mounting hole and a second mounting hole at intervals along its length, with the first mounting hole located above the second mounting hole; the folding chair passes through the first mounting hole; a first bushing is fitted on the folding chair, with the first bushing located below the button; when the folding chair is converted from the unfolded state to the folded state, the first bushing pushes the button upward, forcing the button to lift.

[0008] Furthermore, the rear leg tube and the rear end of the seat tube are hinged by a second hinge shaft; the second hinge shaft passes through the second mounting hole; the limiting sleeve has a slot with the opening facing forward, and the rear end of the seat tube is inserted into the slot; a pair of sliding grooves are correspondingly opened on the two side walls of the slot, and a second bushing is fixed at the rear end of the seat tube corresponding to the position of the sliding groove, the second bushing is located in the sliding groove and sleeved on the second hinge shaft. As a preferred embodiment, the ball positioning hole is located on the top wall of the limiting sleeve; the button is hinged to the top of the limiting sleeve, and a pressing post is provided on the bottom surface of the button corresponding to the ball positioning hole; when the button is pressed down, the pressing post extends into the ball positioning hole and forces the ball to disengage from the ball positioning hole, and the pressing post and the ball positioning hole form an interference fit or a snap fit so that the button can remain in the pressed state. Furthermore, the top wall of the limiting slide sleeve is provided with a backrest tube positioning groove; when the folding chair is in the unfolded state, the lower end of the backrest tube is embedded in the backrest tube positioning groove.

[0009] Furthermore, a V-shaped spring is installed inside the rear end of the seat tube, the ball is fixedly disposed at one end of the V-shaped spring, and the other end of the V-shaped spring is fixed to the seat tube. The V-shaped spring provides elastic preload to the ball.

[0010] Furthermore, the seat tube is a U-shaped tube; and / or, the backrest limiting tube and the self-locking assembly are each provided in two sets, and are symmetrically arranged on the left and right sides of the folding chair, respectively, and a seat tube reinforcing cross tube is connected between the limiting sleeves of the two self-locking assemblies.

[0011] Furthermore, it also includes a fabric cover, which is fitted onto the seat tube and backrest tube to form a seat surface and a backrest. The rear leg tube is a U-shaped tube, and a rear leg reinforcing cross tube is connected between the open ends of the rear leg tube. The fabric cover at the rear end of the seat surface is fitted onto the rear leg reinforcing cross tube. When the folding chair is converted from a folded state to an unfolded state, the rear leg reinforcing cross tube moves in a circular motion with the rear leg tube and pulls the fabric cover fitted onto it backward and downward, thereby tightening the seat surface.

[0012] The folding chair provided by this utility model has the following beneficial effects: During the unfolding process, the backrest tube moves along the seat tube via a limiting plate, and the ball joint engages with the ball positioning hole on the limiting sleeve to automatically lock after unfolding, preventing it from folding down automatically. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the unfolded state of the folding chair according to an embodiment of the present invention; Figure 2 yes Figure 1 A diagram showing a folding chair in a semi-folded state; Figure 3 yes Figure 2 Enlarged view of point A in the middle; Figure 4 It is an exploded view of the self-locking assembly and drawings of the parts that mate with the self-locking assembly; Figure 5 This is a schematic diagram of the folding chair in the folded state according to an embodiment of this utility model.

[0014] Label Explanation: 1. Backrest tube; 2. Seat tube; 3. Front leg tube; 4. Rear leg tube; 5. Backrest limiting tube; 6. Tumbler; 7. Self-locking assembly; 8. Armrest; 9. Second bushing; 10. First bushing; 11. Rear leg reinforcing cross tube; 12. Seat tube reinforcing cross tube; 71. Limiting slide sleeve; 72. Limiting piece; 73. Button; 74. V-shaped spring; 75. Tumbler positioning hole; 41. First mounting hole; 42. Second mounting hole; 73. Pressing post; 78. Backrest tube positioning groove. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0017] like Figures 1 to 5 As shown, this embodiment discloses a folding chair, including a chair frame and a chair cover. The chair frame includes a backrest tube 1, a seat tube 2, a front leg tube 3, a rear leg tube 4, two backrest limiting tubes 5, and two self-locking components 7. The backrest tube 1, seat tube 2, front leg tube 3, and rear leg tube 4 are all U-shaped tubes. The backrest limiting tube 5 is hinged to the backrest tube 1 at its rear end, and the backrest limiting tube 5 is hinged to the seat tube 2 and the front leg tube 3 at its front end. An armrest 8 is hinged to the top of the front leg tube 3, and the backrest tube 1 is hinged to the rear end of the armrest 8.

[0018] The seat tube 2 has a rearward opening and two ends, each with a self-locking component 7. The self-locking component 7 includes a limiting sleeve 71, a limiting piece 72, and a button 73. The limiting sleeve 71 is slidably fitted onto the rear end of the seat tube 2. A V-shaped spring piece 74 with a ball 6 is installed at the rear end of the seat tube 2. The limiting sleeve 71 has a ball positioning hole 75. When the ball 6 enters the ball positioning hole 75, the position of the limiting sleeve 71 on the seat tube 2 is locked. The button 73 presses the ball 6, causing the ball 6 to disengage from the ball positioning hole 75, allowing the limiting sleeve 71 to slide relative to the seat tube 2. In this embodiment, the ball is integrally formed from the V-shaped spring piece 74, but it is not limited to this. For example, the ball can also be a positioning ball (also called a ball plunger or spring plunger).

[0019] One end of the limiting piece 72 is hinged to the limiting sleeve 71, and the other end of the limiting piece 72 is hinged to the rear leg tube 4 and the backrest tube 1 via a first hinge axis. The rear leg tube 4 is hinged to the seat tube 2 via a second hinge axis. Specifically, the rear leg tube 4 is provided with a first mounting hole 41 and a second mounting hole 42. The position of the first mounting hole 41 is higher than the position of the second mounting hole 42. The limiting piece 72 is hinged to the rear leg tube 4 via the first hinge axis in the first mounting hole 41, and the rear leg tube 4 is hinged to the seat tube 2 via the second hinge axis in the second mounting hole 42. The backrest tube 1 and the rear leg tube 4 are hinged together. When folded, the backrest tube 1 and the rear leg tube 4 fold inwards to reduce the folded size.

[0020] In the specific structure, the limiting sleeve 71 has a slot 76 with its opening facing forward. The rear end of the seat tube 2 is inserted into the slot 76. The two side walls of the slot 76 are provided with sliding grooves 77. The rear end of the seat tube 2 is provided with a second bushing 9 corresponding to the two sliding grooves 77. The rear leg tube 4 and the rear end of the seat tube 2 are connected by a second hinge shaft in the second mounting hole 42. The second bushing 9 is fitted on the second hinge shaft and slides along the sliding grooves 77 to restrict the position of the limiting sleeve 71 on the seat tube 2 and prevent the limiting sleeve 71 from falling off the seat tube 2.

[0021] Preferably, the ball positioning hole 75 is located on the top wall of the limiting sleeve 71, and the button 73 is hinged to the top of the limiting sleeve 71. The bottom surface of the button 73 is provided with a pressing post 731 corresponding to the position of the ball positioning hole 75. When the button 73 is pressed down, the pressing post extends into the ball positioning hole and forces the ball to disengage from the ball positioning hole. The pressing post 731 is interference-fitted or snap-fitted with the ball positioning hole 75, so that the button 73 remains in the pressed state, that is, the self-locking device remains in the unlocked state, thereby enabling the folding chair to be folded.

[0022] Preferred, such as Figure 4 The top wall (top surface) of the limiting slide sleeve 71 is provided with a backrest tube positioning groove 78. When the folding chair is in the unfolded state, the lower end of the backrest tube is embedded in the backrest tube positioning groove. When the backrest tube 1 is rotated to the bottom end inserted into the backrest tube positioning groove 78, the unfolding angle is fixed.

[0023] The limiting piece 72 is located on the side of the limiting sleeve 71. The rear end of the limiting piece 72 is hinged to the limiting sleeve 71, and the front end of the limiting piece 72 is hinged to the backrest tube 1 and the rear leg tube 4.

[0024] A first bushing is fitted onto the first hinge shaft. Specifically, a first bushing 10 is provided between the limiting piece 72 and the backrest tube 1. The first bushing 10 is located below the button 73 and fitted onto the first hinge shaft. During the folding chair folding process, the first bushing 10 pushes up the button 73, causing the pressing post 731 to disengage from the ball positioning hole 75, and the button 73 returns to its original unpressed state. The button 73 can also be manually pulled out to return it to its unpressed state.

[0025] In the specific structure, the rear leg tube 4 is a U-shaped tube, and a rear leg reinforcing cross tube 11 is installed at the opening of the rear leg tube 4 to fix the chair fabric. The limiting sleeves 71 of the two self-locking components 7 are connected by the seat tube reinforcing cross tube 12. The seat tube reinforcing cross tube 12 is used to strengthen the structural strength of the seat tube 2. Both the seat tube 2 and the backrest tube 1 are covered with fabric covers to form the seat surface and the backrest (not shown in the figure). The rear end of the seat surface and the lower end of the backrest are connected at the connection line of the seat tube 2 and the backrest tube 1. At the same time, the fabric cover at the rear end of the seat surface extends and is fitted onto the rear leg reinforcing cross tube 11. When the folding chair is converted from the folded state to the unfolded state, the rear leg reinforcing cross tube 11 moves in a circular motion following the rear leg tube 4 and pulls the fabric cover fitted onto it backward and downward, thereby tightening the seat surface.

[0026] During the chair's unfolding process, the backrest tube 1, via the limiting piece 72, drives the limiting sleeve 71 to slide on the seat tube 2. When the chair is fully unfolded, the ball positioning hole 75 on the limiting sleeve 71 moves to be concentric with the ball 6 of the V-shaped spring 74 on the seat tube 2. The V-shaped spring 74, through its elastic force, causes its ball 6 to engage with the ball positioning hole 75 on the limiting sleeve 71, achieving automatic locking. A single press of the button 73 causes the protruding pressing post 731 on the button 73 to separate the ball 6 of the V-shaped spring 74 from the limiting sleeve 71. To unlock, the pressing post 731 of button 73 is interference-fitted with the limiting sleeve 71, keeping button 73 in the pressed state and maintaining the chair in the unlocked state. When the chair is folded to a certain position, the first bushing 10 between the rear leg tube 4 and the backrest tube 1 interacts with button 73, continuing to fold and lift button 73 upward (the first bushing 10 pushes up button 73), returning button 73 to its original unpressed state. This ensures that the chair can automatically lock when unfolded again without being affected by button 73, making it more convenient and safer to use.

[0027] The advantages of the folding chair provided in this embodiment: 1. It automatically locks after unfolding, and can be unlocked by pressing button 73 once, making it easy to use; 2. The button 73 is automatically reset by the folding motion of the tube, eliminating the need for manual reset of the button 73; 3. The fabric is tightened by folding the tubes, which is simpler and provides a better tightening effect; 4. Small folding size.

[0028] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model. Therefore, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. A folding chair, comprising a backrest tube, a seat tube, front leg tubes, rear leg tubes, and armrests, characterized in that, It also includes a backrest limiting tube and a self-locking assembly; The rear leg tube is hinged to the middle or rear of the seat tube; The front end of the backrest limiting tube is hinged to the hinge joint between the seat tube and the front leg tube, and the rear end of the backrest limiting tube is hinged to the middle or lower part of the backrest tube. The top of the front leg tube is hinged to the front end of the armrest, and the rear end of the armrest is hinged to the backrest tube. The self-locking assembly includes a limiting sleeve and a limiting piece; The limiting sleeve is slidably fitted onto the rear end of the seat tube; One end of the limiting piece is hinged to the limiting sleeve, and the other end is hinged to the rear leg tube and the backrest tube through the first hinge axis. The rear end of the seat tube is provided with a ball bearing, and the limiting slide sleeve is provided with a ball bearing positioning hole that cooperates with the ball bearing; when the ball bearing is inserted into the ball bearing positioning hole, the limiting slide sleeve is fixed relative to the seat tube.

2. The folding chair according to claim 1, characterized in that, The self-locking component also includes a button, which is hinged to the limiting sleeve and located above the ball; when the button is pressed, the button contacts the ball and forces the ball to disengage from the ball positioning hole.

3. The folding chair according to claim 2, characterized in that, The upper surface of the button is provided with anti-slip texture; and / or, the lower surface of the button is provided with a pressing post, which contacts the ball when the button is pressed to push the ball away from the ball positioning hole.

4. The folding chair according to claim 3, characterized in that, The rear leg tube is provided with a first mounting hole and a second mounting hole at intervals along its length, with the first mounting hole located above the second mounting hole; the first hinge shaft passes through the first mounting hole; a first bushing is sleeved on the first hinge shaft, with the first bushing located below the button; when the folding chair is converted from the unfolded state to the folded state, the first bushing pushes the button upward, forcing the button to lift up.

5. The folding chair according to claim 4, characterized in that, The rear leg tube and the rear end of the seat tube are hinged by a second hinge shaft; the second hinge shaft passes through the second mounting hole; the limiting sleeve has a slot with the opening facing forward, and the rear end of the seat tube is inserted into the slot; a pair of sliding grooves are correspondingly opened on the two side walls of the slot, and a second bushing is fixed at the rear end of the seat tube corresponding to the position of the sliding groove, the second bushing is located in the sliding groove and sleeved on the second hinge shaft.

6. The folding chair according to claim 2, characterized in that, The ball positioning hole is located on the top wall of the limiting sleeve; the button is hinged to the top of the limiting sleeve, and a pressing post is provided on the bottom surface of the button corresponding to the ball positioning hole; when the button is pressed down, the pressing post extends into the ball positioning hole and forces the ball to disengage from the ball positioning hole, and the pressing post and the ball positioning hole form an interference fit or a snap fit so that the button can remain in the pressed state.

7. The folding chair according to claim 1, characterized in that, The top wall of the limiting slide sleeve is provided with a backrest tube positioning groove; when the folding chair is in the unfolded state, the lower end of the backrest tube is embedded in the backrest tube positioning groove.

8. The folding chair according to claim 1, characterized in that, A V-shaped spring is installed inside the rear end of the seat tube. The ball is fixedly disposed at one end of the V-shaped spring, and the other end of the V-shaped spring is fixed to the seat tube. The V-shaped spring provides elastic preload to the ball.

9. The folding chair according to claim 1, characterized in that, The seat tube is a U-shaped tube; and / or, the backrest limiting tube and the self-locking assembly are each provided in two sets, and are symmetrically arranged on the left and right sides of the folding chair respectively, and a seat tube reinforcing cross tube is connected between the limiting sleeves of the two self-locking assemblies.

10. The folding chair according to claim 9, characterized in that, It also includes a fabric cover, which is fitted onto the seat tube and backrest tube to form a seat surface and a backrest. The rear leg tube is a U-shaped tube, and a rear leg reinforcing cross tube is connected between the open ends of the rear leg tube. The fabric cover at the rear end of the seat surface is fitted onto the rear leg reinforcing cross tube. When the folding chair is converted from a folded state to an unfolded state, the rear leg reinforcing cross tube moves in a circular motion with the rear leg tube and pulls the fabric cover fitted onto it backward and downward, thereby tightening the seat surface.

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