Folding chair with retractable backrest

Abstract

The utility model belongs to the technical field of engineering design, and discloses a folding chair with a retractable backrest, comprising a seat mechanism, the seat mechanism comprising a folding chair body, two mounting rods fixedly connected to the folding chair body, a spring member clamped at the bottom of the mounting rod, locking blocks fixedly connected at both ends of the spring member, the bottom of the mounting rod is slidably connected to an adjusting rod, and adjustment holes are provided on both sides of the adjusting rod. The folding chair with a retractable backrest is convenient for adjusting the height of the backrest of the folding chair body and resetting the locking blocks by arranging structures such as a supporting spring and a movable block. The two locking blocks are pressed to bend the movable blocks toward the inside of a plastic part under pressure, so that the locking blocks are retracted into the inside of the plastic part, and the supporting springs are compressed. Subsequently, one end of the plastic part away from the limit block is inserted into the inside of the mounting rod, so that the limit block is clamped with the bottom of the mounting rod, and at this time, the positioning block is clamped with the slide groove.

Description

Technical Field

[0001] The utility model belongs to the technical field of engineering design, in particular to a folding chair with a retractable backrest. Background Art

[0002] A folding chair is a common piece of portable furniture designed for temporary or limited space situations. Its main feature is that it can be quickly and easily converted from a compact state into a chair for sitting. Originally designed for easy transportation and storage, especially in situations such as camping, picnics, beaches, sporting events, exhibitions, conferences, and disaster relief, the structure of a folding chair is usually made of metal (such as steel or aluminum), wood, or plastic, which are selected for their durability, lightness, and cost-effectiveness. The seat and back of the chair may be made of materials such as fabric, leather, mesh, or hard plastic to provide comfortable sitting and proper support.

[0003] At present, most of the folding chairs with retractable backrests on the market have fixed backrest lengths and cannot be retracted. They are large in size, making it inconvenient to fold and carry the folding chairs. At the same time, they do not have structures such as support springs to enhance the resetting effect, and only rely on the elasticity of the plastic locking parts themselves. Not only are they prone to excessive bending angles at the bends when subjected to greater pressure, thereby generating cracks and reducing the service life of the device, but the resetting effect is poor and the resetting speed is slow, which is not conducive to locking work. Therefore, we propose a folding chair with a retractable backrest. Utility Model Content

[0004] In order to solve the problem in the above background technology that the backrest length of the folding chair is fixed, cannot be retracted, is large in size, is not convenient for retracting and carrying, and does not have a structure such as a supporting spring to enhance the resetting effect, and only relies on the elasticity of the plastic locking part itself, which is not only easy to make the bending angle of the bending part too large when subjected to greater pressure, thereby causing cracks and reducing the service life of the device, but also has a poor resetting effect and a slow resetting speed, which is not conducive to locking work, the utility model provides a folding chair with a retractable backrest.

[0005] To achieve the above object, the utility model provides the following technical solution: comprising a seat mechanism, wherein a telescopic mechanism is arranged on the seat mechanism, a limit mechanism is arranged inside the telescopic mechanism, and an adjustment mechanism is arranged below the telescopic mechanism;

[0006] The seat mechanism includes a folding chair body, which is fixedly connected to two mounting rods, the bottom of the mounting rod is clamped with a spring member, both ends of the spring member are fixedly connected with locking blocks, the bottom of the mounting rod is slidably connected to an adjustment rod, adjustment holes are provided on both sides of the adjustment rod, and the locking block passes through the inner wall of the mounting rod and is clamped between the adjustment hole.

[0007] Preferably, a protective cover is clamped inside the adjusting rod, a boss is fixedly connected to the top of the protective cover, fixed blocks are fixedly connected to both sides of the protective cover, the fixed blocks are clamped with the adjusting hole, the fixed block is located above the locking block, and the protective cover is located on the top of the adjusting rod.

[0008] Preferably, the limiting mechanism includes a plastic part, the bottom of the plastic part is fixedly connected to a limiting block, two movable blocks are respectively arranged on both sides of the plastic part, the two movable blocks are fixedly connected to a locking block on the sides away from each other, two sliding grooves are provided on the side of the plastic part, the inner wall of the plastic part is fixedly connected to a support rod, and the support rod is elastically connected to the two movable blocks through two support springs.

[0009] Preferably, one end of the two support springs away from the support rod is fixedly connected to one side of the two movable blocks close to each other, and the support rod is located between the two sliding grooves.

[0010] Preferably, the telescopic mechanism comprises a mounting rod, fixing holes are respectively provided on both sides of the mounting rod, and two positioning blocks are fixedly connected inside the mounting rod.

[0011] Preferably, the size of the positioning block is adapted to the size of the slide slot, the positioning block and the slide slot are slidingly connected, the plastic part and the inner wall of the mounting rod are slidingly connected, the size of the fixing hole is adapted to the size of the locking block, the fixing hole and the locking block are clamped, and the limit block is clamped to the bottom of the mounting rod.

[0012] Preferably, the adjustment mechanism comprises an adjustment rod, and a plurality of adjustment holes are evenly formed on both sides of the adjustment rod.

[0013] Preferably, the size of the adjusting hole is larger than that of the fixing hole, the adjusting hole is snap-fitted with the limiting block, and the surface of the mounting rod is slidably connected with the inner wall of the adjusting rod.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0015] The utility model provides a supporting spring and a movable block to cooperate with each other, thereby facilitating the height adjustment of the backrest of the folding chair body and the resetting of the locking block. The two locking blocks are pressed to make the movable block bend toward the inside of the plastic part under pressure, so that the locking block is retracted into the inside of the plastic part and the supporting spring is in a compressed state. Subsequently, the end of the plastic part away from the limit block is inserted into the inside of the mounting rod, so that the limit block is engaged with the bottom of the mounting rod. At this time, the positioning block is engaged with the slide groove, and the movable block is reset under the action of the elastic force of the supporting spring and the elasticity of the movable block itself, so that the locking block is engaged with the fixing hole, and the installation and fixation of the plastic part are completed. At the same time, the supporting spring can prevent the movable block from bending excessively to produce cracks, thereby improving the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the structural relationship between the protective cover and the adjusting rod of the utility model;

[0018] Figure 3 This is a schematic diagram of the structural relationship between the mounting rod and the adjusting rod of the utility model;

[0019] Figure 4 This is a schematic diagram of the structural relationship between the locking block and the fixing hole of the utility model;

[0020] Figure 5 This is a schematic diagram of the structural relationship between the positioning block and the slide slot of the utility model;

[0021] Figure 6 This is a schematic diagram of the three-dimensional structure of the limiting mechanism of the utility model;

[0022] Figure 7 It is a schematic diagram of the internal structure of the telescopic mechanism of the utility model.

[0023] In the figure: 1. limit mechanism; 101. plastic part; 102. limit block; 103. movable block; 104. locking block; 105. slide groove; 106. support rod; 107. support spring; 2. telescopic mechanism; 201. mounting rod; 202. fixing hole; 203. positioning block; 3. adjustment mechanism; 301. adjustment rod; 302. adjustment hole; 4. seat mechanism; 401. folding chair body; 402. spring part; 403. protective cover; 404. boss; 405. fixing block. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Example 1

[0026] like Figure 1 and Figure 3 As shown, the utility model provides a folding chair with a retractable backrest, comprising a seat mechanism 4, a retractable mechanism 2 is arranged on the seat mechanism 4, a limit mechanism 1 is arranged inside the retractable mechanism 2, and an adjustment mechanism 3 is arranged below the retractable mechanism 2;

[0027] The seat mechanism 4 includes a folding chair body 401, on which two mounting rods 201 are fixedly connected, a spring member 402 is clamped at the bottom of the mounting rod 201, both ends of the spring member 402 are fixedly connected with a locking block 104, the bottom of the mounting rod 201 is slidably connected to the adjusting rod 301, and adjustment holes 302 are opened on both sides of the adjusting rod 301, and the locking block 104 passes through the inner wall of the mounting rod 201 and is clamped between the adjusting hole 302.

[0028] A protective cover 403 is clamped inside the adjusting rod 301, a boss 404 is fixedly connected to the top of the protective cover 403, and fixing blocks 405 are fixedly connected to both sides of the protective cover 403. The fixing blocks 405 are clamped with the adjusting hole 302, the fixing blocks 405 are located above the locking block 104, and the protective cover 403 is located on the top of the adjusting rod 301.

[0029] By providing the mounting rod 201 and the spring member 402, the staff can press the locking block 104 on the spring member 402 to release the engagement between the locking block 104 and the adjusting hole 302, and move the mounting rod 201 downward to retract the mounting rod 201 into the inside of the adjusting rod 301, so that the staff can retract and carry the folding chair body 401. The protective cover 403 and the boss 404 can prevent the mounting rod 201 from colliding with the adjusting rod 301 when the mounting rod 201 is retracted.

[0030] Example 2

[0031] like Figures 4 to 6As shown, the utility model provides a folding chair with a retractable backrest, the limiting mechanism 1 includes a plastic part 101, the bottom of the plastic part 101 is fixedly connected to a limiting block 102, two movable blocks 103 are respectively arranged on both sides of the plastic part 101, the two movable blocks 103 are fixedly connected to the sides away from each other with locking blocks 104, two sliding grooves 105 are provided on the side of the plastic part 101, the inner wall of the plastic part 101 is fixedly connected to a support rod 106, and the support rod 106 is elastically connected to the two movable blocks 103 respectively through two support springs 107.

[0032] One end of the two support springs 107 away from the support rod 106 is fixedly connected to one side of the two movable blocks 103 close to each other, and the support rod 106 is located between the two sliding grooves 105.

[0033] like Figure 4 As shown, Figure 4 The direction close to the icon positioning block 203 is upward, the direction close to the icon locking block 104 is left, and when the movable block 103 is in a non-squeezed state, the two support springs 107 are in a state as shown in FIG. Figure 4 The natural state shown in the figure is facilitated by arranging the support spring 107 and the movable block 103 and other structures to adjust the height of the backrest of the folding chair body 401 and reset the locking block 104. The two locking blocks 104 are pressed to bend the movable block 103 toward the inside of the plastic part 101, and the locking block 104 is retracted into the inside of the plastic part 101, and the support spring 107 is in a compressed state. Then, the end of the plastic part 101 away from the limit block 102 is inserted into the inside of the mounting rod 201, so that the limit block 102 is engaged with the bottom of the mounting rod 201. At this time, the positioning block 203 is engaged with the slide groove 105, and the movable block 103 is reset under the action of the elastic force of the support spring 107 and the elasticity of the movable block 103 itself, so that the locking block 104 is engaged with the fixing hole 202, and the installation and fixation of the plastic part 101 is completed. At the same time, the support spring 107 can prevent the movable block 103 from bending excessively to produce cracks, thereby improving the service life of the device.

[0034] like Figures 1 to 7 As shown, the telescopic mechanism 2 includes a mounting rod 201 , fixing holes 202 are respectively opened on both sides of the mounting rod 201 , and two positioning blocks 203 are fixedly connected inside the mounting rod 201 .

[0035] The size of the positioning block 203 is adapted to the size of the slide groove 105, the positioning block 203 and the slide groove 105 are slidingly connected, the plastic part 101 and the inner wall of the mounting rod 201 are slidingly connected, the size of the fixing hole 202 is adapted to the size of the locking block 104, the fixing hole 202 and the locking block 104 are clamped, and the limit block 102 and the bottom of the mounting rod 201 are clamped.

[0036] The adjustment mechanism 3 includes an adjustment rod 301, and a plurality of adjustment holes 302 are evenly opened on both sides of the adjustment rod 301. The size of the adjustment hole 302 is larger than the size of the fixing hole 202. The adjustment hole 302 is clamped with the limit block 102, and the surface of the mounting rod 201 is slidably connected with the inner wall of the adjustment rod 301.

[0037] By providing the positioning block 203 and the slide groove 105 , it is convenient to install and fix the plastic part 101 , thereby avoiding misalignment during installation, thereby preventing the plastic part 101 from being worn.

[0038] The working principle and use process of the utility model are as follows: first, the staff needs to align the slide groove 105 on the side of the plastic part 101 with the positioning block 203 on the inner wall of the mounting rod 201, and press the two locking blocks 104, so that the movable block 103 is pressed and bent toward the inside of the plastic part 101, and the locking block 104 is retracted into the inside of the plastic part 101, and the supporting spring 107 is in a compressed state, and then the end of the plastic part 101 away from the limit block 102 is inserted into the inside of the mounting rod 201, so that the limit block 102 is engaged with the bottom of the mounting rod 201, at this time, the positioning block 203 is engaged with the slide groove 105, and the movable block 103 is reset under the action of the elastic force of the supporting spring 107 and the elasticity of the movable block 103 itself, so that the locking block 104 is engaged with the fixing hole 202;

[0039] Then, the bottom of the mounting rod 201 is inserted into the interior of the adjusting hole 302, and the locking block 104 is squeezed, so that the portion of the locking block 104 that exceeds the fixing hole 202 is squeezed into the interior of the fixing hole 202, so that the mounting rod 201 can slide inside the adjusting hole 302 until the locking block 104 moves to the adjusting hole 302. The locking block 104 will be engaged with the adjusting hole 302 under the action of the elastic force of the support spring 107, thereby completing the locking and adjustment between the mounting rod 201 and the adjusting rod 301.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A folding chair with a retractable backrest, comprising a seat mechanism (4), characterized in that: The seat mechanism (4) is provided with a telescopic mechanism (2), a limiting mechanism (1) is provided inside the telescopic mechanism (2), and an adjustment mechanism (3) is provided below the telescopic mechanism (2); The chair mechanism (4) comprises a folding chair body (401), two mounting rods (201) are fixedly connected to the folding chair body (401), a spring member (402) is clamped at the bottom of the mounting rod (201), both ends of the spring member (402) are fixedly connected with a locking block (104), the bottom of the mounting rod (201) is slidably connected to an adjustment rod (301), both sides of the adjustment rod (301) are provided with adjustment holes (302), and the locking block (104) passes through the inner wall of the mounting rod (201) and is clamped between the adjustment hole (302).

2. The folding chair with a retractable backrest according to claim 1, characterized in that: A protective sleeve (403) is clamped inside the adjusting rod (301), a boss (404) is fixedly connected to the top of the protective sleeve (403), fixed blocks (405) are fixedly connected to both sides of the protective sleeve (403), the fixed blocks (405) are clamped to the adjusting hole (302), the fixed blocks (405) are located above the locking block (104), and the protective sleeve (403) is located on the top of the adjusting rod (301).

3. The folding chair with a retractable backrest according to claim 1, characterized in that: The limiting mechanism (1) comprises a plastic part (101), the bottom of the plastic part (101) is fixedly connected to a limiting block (102), two movable blocks (103) are respectively arranged on both sides of the plastic part (101), and the two movable blocks (103) are fixedly connected to a locking block (104) on the sides away from each other, two sliding grooves (105) are provided on the side of the plastic part (101), and the inner wall of the plastic part (101) is fixedly connected to a support rod (106), and the support rod (106) is elastically connected to the two movable blocks (103) respectively through two support springs (107).

4. The folding chair with a retractable backrest according to claim 3, characterized in that: One end of the two support springs (107) away from the support rod (106) is fixedly connected to the sides of the two movable blocks (103) close to each other, and the support rod (106) is located between the two slide grooves (105).

5. The folding chair with a retractable backrest according to claim 3, characterized in that: The telescopic mechanism (2) comprises a mounting rod (201), fixing holes (202) are respectively provided on both sides of the mounting rod (201), and two positioning blocks (203) are fixedly connected inside the mounting rod (201).

6. The folding chair with a retractable backrest according to claim 5, characterized in that: The size of the positioning block (203) is matched with the size of the slide groove (105), the positioning block (203) and the slide groove (105) are slidably connected, the plastic part (101) and the inner wall of the mounting rod (201) are slidably connected, the size of the fixing hole (202) is matched with the size of the locking block (104), the fixing hole (202) and the locking block (104) are snap-fitted, and the limit block (102) is snap-fitted with the bottom of the mounting rod (201).

7. The folding chair with a retractable backrest according to claim 5, characterized in that: The adjustment mechanism (3) comprises an adjustment rod (301), and a plurality of adjustment holes (302) are evenly arranged on both sides of the adjustment rod (301).

8. The folding chair with a retractable backrest according to claim 7, characterized in that: The size of the adjustment hole (302) is larger than that of the fixing hole (202); the adjustment hole (302) is snap-fitted to the limit block (102); and the surface of the mounting rod (201) is slidably connected to the inner wall of the adjustment rod (301).

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