Locking mechanism of a folding chair

Abstract

The invention discloses a locking mechanism for a folding chair, relating to the technical field of folding chairs, comprising a first mounting plate and a second mounting plate, the first mounting plate and the second mounting plate, the first mounting plate being rotatably connected to a connecting rod, one end of the connecting rod close to the second mounting plate being rotatably connected to the first swing arm, the first swing arm being connected to the second mounting plate, the first swing arm being rotatably connected to the second mounting plate, the second swing arm being provided with a bottom support frame, and the first swing arm and the second swing arm being provided with a locking mechanism; the invention drives a locking wheel to gradually engage with a plurality of oblique grooves and a plurality of oblique clamping blocks along a fixed spring, and engages the locking wheel with the plurality of oblique clamping blocks, and at the same time engages a locking gear to be engaged with the gear groove under the action of the fixed spring, and at the same time, the other side of the engaging gear is engaged and fixed with the rotating groove, so that the connecting rod and the first swing arm are fixed, and the second swing arm and the connecting rod are also fixed.

Description

Technical Field

[0001] The present invention relates to the technical field of folding chairs, in particular to a locking mechanism of a folding chair. Background Art

[0002] Existing folding chairs, such as the "Infant Chair with Lifting and Folding Function" disclosed in Patent No. CN217243474U, use upper and lower joint covers to push the arm joint gears and the bottom foot gears inward, thereby releasing the rotation restrictions on the upper and lower folding groups, respectively, and thus allowing the infant chair to be folded, thereby reducing the space occupied. That is, the movement restrictions at the joints are released by rotation.

[0003] In the aforementioned application, the chair needs to be fixed with a clamp in normal use to prevent it from collapsing. If the clamps at the chair joints are accidentally touched, the chair can easily fold, causing the chair to collapse. Furthermore, during the storage process, the various joints of the folding chair need to be adjusted, which reduces the storage efficiency and makes it inconvenient to quickly store the chair. To address this issue, we provide a locking mechanism for a folding chair. Summary of the Invention

[0004] The object of the present invention is to provide a locking mechanism for a folding chair.

[0005] The technical problem solved by the present invention is: under normal conditions, the chair needs to be clamped and fixed to prevent the chair from shrinking. If the clamping parts of the chair joints are accidentally touched, the chair is easily folded, causing the chair to be stored; at the same time, during the storage process of the chair, the various joints of the folding chair need to be adjusted, resulting in low storage efficiency of the folding chair and inconvenience in quick storage and use of the folding chair.

[0006] The present invention can be implemented by the following technical solution: a locking mechanism for a folding chair, comprising a first mounting plate and a second mounting plate, wherein the first mounting plate is rotatably connected to a connecting rod, an end of the connecting rod close to the second mounting plate is rotatably connected to a first swing arm, the first swing arm is connected to the second mounting plate, an end of the connecting rod away from the first swing arm is rotatably connected to the second swing arm, the second swing arm is provided with a bottom support frame, and the first swing arm and the second swing arm are both provided with a locking mechanism;

[0007] The locking mechanism includes a locking wheel, gear grooves on both ends of the connecting rod, multiple oblique blocks along the axis of the gear groove, multiple oblique grooves matching the multiple oblique blocks on the locking wheel, a locking gear in the gear groove, and rotating grooves corresponding to the gear grooves on the first swing arm and the second swing arm.

[0008] A further technical improvement of the present invention is that the locking mechanism also includes a fixing rod, which is arranged on the rotating groove and arranged along the rotating axis of the rotating groove. Both the locking wheel and the clamping gear are provided with movable holes, the fixing rod is sleeved in the movable hole, and a fixing spring is provided on the outer sleeve of the fixing rod, and the fixing spring is located between the clamping gear and the rotating groove.

[0009] A further technical improvement of the present invention is that: a connecting block is connected to the outer side of each locking wheel, a connecting rope is connected to each connecting block, and a wiring groove adapted to the connecting rope is provided on the connecting rod.

[0010] The further technical improvement of the present invention is that: a clamping plate is slidably installed on the first mounting plate, two sliding blocks are slidably installed on the first mounting plate, and the sliding direction of the two sliding blocks is perpendicular to the sliding direction of the clamping plate, a clamping conical groove is provided on the first mounting plate, the two sliding blocks are both located in the clamping conical groove, and the two sliding blocks are respectively connected to two connecting ropes, and a handle is provided on the clamping plate.

[0011] A further technical improvement of the present invention is that a driving spring is provided on the clamping plate to drive the sliding block to move toward the connecting rope.

[0012] A further technical improvement of the present invention is that a locking mechanism for fixing the clamping plate is provided on the first mounting plate.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) This mechanism drives the locking wheel along the multiple oblique grooves and the multiple oblique blocks through the fixed spring, and the locking wheel is locked with the multiple oblique blocks. At the same time, the locking gear is locked into the gear groove under the action of the fixed spring, and the other side of the locking gear is locked and fixed with the rotating groove, so that the connecting rod and the first swing arm are fixed, and the second swing arm and the connecting rod are also fixed, so that the entire folding chair is in an extended state in the daily state and can be unfolded and fixed without locking;

[0015] (2) When it is necessary to release the fixation between the connecting rod and the first swing arm, and also to release the fixation between the second swing arm and the connecting rod, the locking wheel is reversed so that the locking wheel gradually slides out of the multiple oblique blocks along the multiple oblique grooves, thereby releasing the locking wheel from the oblique groove. At the same time, the locking wheel drives the engaging gear to move in a direction away from the gear groove, thereby releasing the engaging gear from the gear groove. The engaging gear is only located in the rotating groove, thereby allowing the first swing arm and the second swing arm to be freely folded, making it convenient to fold the entire folding chair and to facilitate the folding and storage of the entire folding chair.

[0016] (3) The handle drives the clamping plate to slide, and the clamping plate drives the two sliding blocks to slide vertically through the clamping conical groove, thereby driving the connecting rope to pull the two connecting blocks and the two locking wheels to rotate in the opposite direction to release the lock, making it easier to fold and store the entire folding chair and improving the folding efficiency of the folding chair. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention in a folded state;

[0019] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention in an extended state;

[0020] Figure 3 It is an exploded structural diagram of the present invention;

[0021] Figure 4 This is an exploded structural diagram from another perspective of the present invention;

[0022] Figure 5 This is an exploded structural diagram from another perspective of the present invention;

[0023] Figure 6 This is a three-dimensional structural diagram of the locking wheel of the present invention;

[0024] Figure 7 This is a three-dimensional structural diagram of the oblique card block of the present invention;

[0025] Figure 8 This is a structural diagram of the sliding block of the present invention in the clamping tapered groove.

[0026] In the figure: 1. First mounting plate; 2. Second mounting plate; 3. Connecting rod; 4. First swing arm; 5. Second swing arm; 6. Locking wheel; 7. Gear groove; 8. Oblique clamping block; 9. Oblique groove; 10. Snap-on gear; 11. Fixed rod; 12. Movable hole; 13. Fixed spring; 14. Rotating groove; 15. Connecting rope; 16. Wiring groove; 17. Snap-on plate; 18. Sliding block; 19. Handle; 20. Drive spring; 21. Snap-on conical groove; 22. Bottom support frame. DETAILED DESCRIPTION

[0027] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0028] See also Figures 1-8As shown, the present invention proposes a locking mechanism for a folding chair, comprising a first mounting plate 1 and a second mounting plate 2, the first mounting plate 1 and the second mounting plate 2, a connecting rod 3 being rotatably connected to the first mounting plate 1, an end of the connecting rod 3 close to the second mounting plate 2 being rotatably connected to a first swing arm 4, the first swing arm 4 being connected to the second mounting plate 2, an end of the connecting rod 3 away from the first swing arm 4 being rotatably connected to a second swing arm 5, a bottom support frame 22 being provided on the second swing arm 5, and a locking mechanism being provided on both the first swing arm 4 and the second swing arm 5; when the first mounting plate 1, the second mounting plate 2 and the bottom support frame 22 are extended, the connecting rod 3 and the first swing arm 4 are fixed by the locking mechanism, and the second swing arm 5 and the connecting rod 3 are also fixed, thereby achieving locking between the entire folding chair, so that the folding chair maintains an unfolded state;

[0029] The locking mechanism includes a locking wheel 6, gear grooves 7 are provided on both ends of the connecting rod 3, and a plurality of oblique blocks 8 are provided in the gear groove 7 along its axis. The locking wheel 6 is provided with a plurality of oblique grooves 9 adapted to the plurality of oblique blocks 8, and a clamping gear 10 is provided in the gear groove 7. The first swing arm 4 and the second swing arm 5 are both provided with a rotating groove 14 corresponding to the gear groove 7, and a fixing rod 11 is provided in the rotating groove 14 along its rotation axis. A movable hole 12 is provided in the locking wheel 6 and the clamping gear 10, and the fixing rod 11 is sleeved in the movable hole 12. A fixing spring 13 is provided on the outer outer surface of the fixing rod 11, and the fixing spring 13 is located between the clamping gear 10 and the rotating groove 14. By rotating the locking wheel 6, the locking wheel 6 is gradually engaged with the multiple oblique blocks 8 along the multiple oblique grooves 9, and the locking wheel 6 is locked with the multiple oblique blocks 8, and the engaging gear 10 is engaged with the gear groove 7 under the action of the fixing spring 13. At the same time, the other side of the engaging gear 10 is engaged and fixed with the rotating groove 14, so that the connecting rod 3 and the first swing arm 4 are fixed, and the second swing arm 5 and the connecting rod 3 are also fixed; at the same time, when it is necessary to release the fixation between the connecting rod 3 and the first swing arm 4, and also the fixation between the second swing arm 5 and the connecting rod 3, the locking wheel 6 is reversed to make the locking wheel 6 gradually slide out of the multiple oblique blocks 8 along the multiple oblique grooves 9, thereby releasing the locking wheel 6 from the oblique groove 9, and at the same time, the locking wheel 6 drives the engaging gear 10 to move in the direction away from the gear groove 7, thereby releasing the engaging gear 10 from the gear groove 7, and the engaging gear 10 is only located in the rotating groove 14, so that the first swing arm 4 and the second swing arm 5 can be freely folded.

[0030] Each locking wheel 6 is connected to a connecting block on its outer side, and each connecting block is connected to a connecting rope 15. The connecting rod 3 is provided with a wiring slot 16 adapted to the connecting rope 15. By pulling the connecting rope 15, the connecting block and the locking wheel 6 are rotated, thereby reversing the locking wheel 6, causing the locking wheel 6 to gradually slide out of the multiple oblique clamping blocks 8 along the multiple oblique grooves 9, thereby releasing the locking wheel 6 from the oblique grooves 9.

[0031] A snap-on plate 17 is slidably mounted on the first mounting plate 1. Two sliding blocks 18 are slidably mounted on the first mounting plate 1, and the sliding directions of the two sliding blocks 18 are perpendicular to the sliding direction of the snap-on plate 17. A snap-on tapered groove 21 is provided on the first mounting plate 1, and the two sliding blocks 18 are both located within the snap-on tapered groove 21. The two sliding blocks 18 are respectively connected to two connecting ropes 15. A handle 19 is provided on the snap-on plate 17. By pulling the handle 19, the snap-on plate 17 is driven to slide. The snap-on plate 17 drives the two sliding blocks 18 to slide vertically through the snap-on tapered groove 21, thereby driving the connecting rope 15 to pull the connecting block and the locking wheel 6 to rotate in the opposite direction, thereby releasing the lock and facilitating the folding and storage of the entire folding chair.

[0032] A driving spring 20 is provided on the clamping plate 17 to drive the sliding block 18 to move toward the connecting rope 15. When the handle 19 is not pulled to drive the clamping plate 17 to slide, the driving spring 20 drives the sliding block 18 to slide in the direction of the connecting rope 15, loosening the connecting rope 15 and facilitating the forward rotation of the locking wheel 6.

[0033] The first mounting plate 1 is provided with a locking mechanism for fixing the clamping plate 17. The clamping plate 17 is clamped and fixed by the locking mechanism, thereby clamping and fixing the clamping plate 17 to prevent the clamping plate 17 from sliding and causing the folding chair to loosen when the folding chair is unfolded.

[0034] When the present invention is in use, the handle 19 is pulled to drive the clamping plate 17 to slide, and the clamping plate 17 drives the two sliding blocks 18 to slide vertically through the clamping tapered groove 21, thereby driving the connecting rope 15 to pull the connecting block and the locking wheel 6 to rotate in the opposite direction to release the lock, making it convenient for the folding and storage of the entire folding chair; pulling the connecting rope 15 drives the connecting block and the locking wheel 6 to rotate, thereby reversing the locking wheel 6, so that the locking wheel 6 gradually slides out of the multiple oblique clamping blocks 8 along the multiple oblique grooves 9, thereby releasing the clamping of the locking wheel 6 from the oblique grooves 9; making the locking wheel 6 gradually slide out of the multiple oblique clamping blocks 8 along the multiple oblique grooves 9, thereby releasing the clamping of the locking wheel 6 from the oblique grooves 9, and at the same time, the locking wheel 6 drives the engaging gear 10 to move in the direction away from the gear groove 7, thereby releasing the engaging gear 10 from the gear groove 7, and the engaging gear 10 is only located in the rotating groove 14, so that the first swing arm 4 and the second swing arm 5 can be freely folded; the locking wheel 6 is driven by the fixing spring 13 to gradually engage with the multiple oblique grooves 9 and the multiple oblique blocks 8, and the locking wheel 6 is locked with the multiple oblique blocks 8. The engaging gear 10 is engaged with the gear groove 7 under the action of the fixing spring 13, and at the same time, the other side of the engaging gear 10 is engaged and fixed with the rotating groove 14, so that the connecting rod 3 and the first swing arm 4 are fixed, and the second swing arm 5 and the connecting rod 3 are also fixed.

[0035] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A locking mechanism for a folding chair, comprising a first mounting plate (1) and a second mounting plate (2), wherein the first mounting plate (1) is rotatably connected to a connecting rod (3), an end of the connecting rod (3) close to the second mounting plate (2) is rotatably connected to a first swing arm (4), the first swing arm (4) is connected to the second mounting plate (2), an end of the connecting rod (3) away from the first swing arm (4) is rotatably connected to a second swing arm (5), and the second swing arm (5) is provided with a bottom support frame (22), characterized in that: The first swing arm (4) and the second swing arm (5) are both provided with a locking mechanism; The locking mechanism comprises a locking wheel (6), a gear groove (7) is provided on both ends of the connecting rod (3), a plurality of oblique clamping blocks (8) are provided in the gear groove (7) along its axis, a plurality of oblique grooves (9) adapted to the plurality of oblique clamping blocks (8) are provided on the locking wheel (6), a clamping gear (10) is provided in the gear groove (7), and a rotation groove (14) corresponding to the gear groove (7) is provided on the first swing arm (4) and the second swing arm (5); The locking mechanism further comprises a fixing rod (11), the fixing rod (11) being arranged on the rotating groove (14) and being arranged along the rotating axis of the rotating groove, the locking wheel (6) and the engaging gear (10) both being provided with movable holes (12), the fixing rod (11) being sleeved in the movable holes (12), the fixing rod (11) being provided with a fixing spring (13) on its outer sleeve, and the fixing spring (13) being located between the engaging gear (10) and the rotating groove (14); The outer side of each locking wheel (6) is connected to a connecting block, and each connecting block is connected to a connecting rope (15). The connecting rod (3) is provided with a wiring groove (16) adapted to the connecting rope (15).

2. The locking mechanism of a folding chair according to claim 1, characterized in that: A snap-in plate (17) is slidably mounted on the first mounting plate (1), two sliding blocks (18) are slidably mounted on the first mounting plate (1), and the sliding directions of the two sliding blocks (18) are perpendicular to the sliding direction of the snap-in plate (17), a snap-in conical groove (21) is provided on the first mounting plate (1), the two sliding blocks (18) are both located in the snap-in conical groove (21), and the two sliding blocks (18) are respectively connected to two connecting ropes (15), and a handle (19) is provided on the snap-in plate (17).

3. The locking mechanism of a folding chair according to claim 2, characterized in that: The clamping plate (17) is provided with a driving spring (20) for driving the sliding block (18) to move toward the direction approaching the connecting rope (15).

4. The locking mechanism of a folding chair according to claim 3, characterized in that: The first mounting plate (1) is provided with a locking mechanism for fixing the clamping plate (17).

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