Adjusting mechanism convenient to operate

Abstract

The utility model provides an adjusting mechanism convenient to operate, which comprises a moving device and two moving parts, and the moving parts are rotationally arranged on a base of the moving device; a linkage mechanism and a locking mechanism are arranged on the base, linkage parts and gear parts are correspondingly arranged on the moving parts, the linkage mechanism is matched with the linkage parts to achieve linkage of the moving parts on the two sides on the base, and the locking mechanism is matched with the gear parts to achieve stop of the moving parts after rotating in the adjusting direction; the moving part is further provided with a self-circulation part, the self-circulation part is configured to delay rotation along with the moving part, and after the self-circulation part rotates along with the moving part in the adjusting direction, the gear part is disengaged from the locking mechanism, and the moving part can rotate in the reset direction to achieve reset; by means of the scheme, the mechanism can achieve linkage of moving parts on the two sides and can also achieve self-circulation adjustment, and operation is easier and more convenient while the functional effect is achieved.

Description

Technical Field

[0001] The utility model relates to the field of furniture, in particular to an adjustment mechanism which is easy to operate. Background Art

[0002] In modern furniture, there are many adjustable moving parts to achieve different functions, and these parts often achieve motion adjustment through mechanical motion mechanisms, such as lifting mechanisms, rotating mechanisms, etc.; there are many ways of adjustment, such as linkage adjustment, adjustment with gears, etc.; many symmetrically arranged moving parts will use linkage adjustment, because when adjusting the moving parts on one side, the moving parts on the other side can be linked, so as to make the adjustment operation more convenient; there are also different schemes in gear adjustment, the more common ones are manual unlocking and locking gear adjustment and self-circulating gear adjustment. Manual unlocking and locking gear adjustment always requires the user to operate the operating lever or button, and after unlocking, the moving parts must be further operated, which is more troublesome; while the self-circulating gear adjustment can switch between different gears by directly operating the moving parts, which is a more convenient and easy human-computer interaction method.

[0003] For different functions, moving parts will use different mechanisms and adjustment methods. Taking the lumbar clamping device on the seat as an example, the armrests on both sides are moving parts. The movement of the armrests can enable the lumbar support to achieve the lumbar clamping function. When the lumbar support clamps the waist, the lumbar support needs to move symmetrically on both sides to keep the human body's lumbar spine centered and vertical, that is, the armrests on both sides need to be linked; at the same time, in order to meet the needs of convenient operation, it is urgent to design a motion mechanism to achieve this. Summary of the invention

[0004] In order to solve the above-mentioned technical problems, the utility model provides an adjustment mechanism that is easy to operate, including a moving device and two moving parts, the moving parts are rotatably arranged on the base of the moving device; a linkage mechanism and a locking mechanism are provided on the base, and a linkage part and a gear part are correspondingly provided on the moving parts, the linkage mechanism cooperates with the linkage part and realizes the linkage of the moving parts on both sides on the base, and the locking mechanism cooperates with the gear part and keeps the moving parts in the position after rotation; a self-circulation part is also provided on the moving parts, the self-circulation part is configured to delay following the rotation of the moving parts, and after the self-circulation part rotates with the moving parts in the adjustment direction, the gear part is disengaged from the locking mechanism, and the moving parts can rotate in the resetting direction to realize resetting; through this scheme, the mechanism can realize both the linkage of the moving parts on both sides and the self-circulation adjustment, and makes the operation simpler and more convenient while achieving the functional effect.

[0005] The technical solution of the utility model is achieved in this way:

[0006] The invention discloses an adjustment mechanism which is easy to operate, comprising a moving device and two moving parts located on both sides of the moving device, wherein the moving device comprises a base, and the two moving parts are both rotatably arranged on the base; a linkage mechanism and a locking mechanism are arranged on the base, and a linkage part and a shift part are correspondingly arranged on the moving parts, the linkage part is transmission-connected with the linkage mechanism, and the linkage mechanism is configured to make the two moving parts rotate at the same time; the rotation direction of the moving parts is divided into an adjustment direction and a reset direction which are opposite in direction, the shift part cooperates with the locking mechanism and is configured to limit the rotation of the moving parts in the reset direction when the moving parts rotate in the adjustment direction, and keep the moving parts in the position after the rotation; a coaxially rotating self-circulating part is also arranged on the moving parts, the self-circulating part is configured to delay and follow the rotation of the moving parts, and after the self-circulating part rotates with the moving parts in the adjustment direction, the shift part is disengaged from the locking mechanism, and the moving parts can rotate in the reset direction to achieve reset.

[0007] The movement device of the mechanism is provided with a linkage mechanism and a locking mechanism, and the two mechanisms act on the moving parts with their respective functions. The moving parts on both sides are linked by the linkage mechanism and the linkage part, and when the moving part on one side is rotated, the moving part on the other side can be rotated together; the gear adjustment is realized by the gear part and the locking mechanism, and the moving part can be kept in the position after rotation after rotating in the adjustment direction, so that the state of the mechanism after adjustment can be changed and maintained stable; the locking mechanism is disengaged from the gear part by the self-circulation part to realize the self-circulation adjustment of the moving part, and after the locking mechanism is disengaged from the gear part, the moving part can be rotated in the resetting direction, and the moving part can be reset to the initial state, so that the moving part can be adjusted again from the initial state; therefore, the mechanism can realize both the linkage of the moving parts on both sides and the self-circulation adjustment, and makes the operation simpler and more convenient while achieving the functional effect.

[0008] Preferably, the gear portion includes a plurality of ratchets; the locking mechanism includes two sliders symmetrically arranged on the base and a spring arranged between the two sliders, the two sliders are slidably arranged on the base, the sliders include locking teeth meshed with the ratchets, and the ratchets and the locking teeth are one-way self-locking; when the two moving parts rotate in the adjustment direction, the locking teeth mesh with different ratchets; when the two moving parts have a tendency to rotate in the reset direction, the ratchets and the locking teeth are self-locking. The one-way self-locking of the ratchets and the locking teeth can achieve the effect of keeping the moving parts in the current position after rotation, thereby realizing the function of the gear; the spring allows the two sliders to slide and reset, and when the moving parts rotate toward the adjustment direction, the two sliders slide close to each other, so that the locking teeth can switch between different ratchets; it is also possible to have multiple locking teeth, thereby increasing the stability when the locking teeth are meshed with the ratchets.

[0009] Preferably, an arc-shaped waist hole is provided on the self-circulating part, and a convex shaft inserted in the arc-shaped waist hole is provided on the moving part. When the moving part rotates, the convex shaft moves in the arc-shaped waist hole; the arc-shaped waist hole has a front end and a rear end, and the self-circulating part is configured so that when the two moving parts are in an initial state, the convex shaft is located at the front end of the arc-shaped waist hole, and when the two moving parts rotate in the adjustment direction, the convex shaft moves from the front end to the rear end of the arc-shaped waist hole; after the convex shaft abuts against the rear end of the arc-shaped waist hole, the two moving parts continue to rotate in the adjustment direction, and the convex shaft drives the self-circulating parts to rotate, and the two self-circulating parts push the two sliders closer to each other and disengage the ratchet and the locking teeth, and the two moving parts can rotate in the reset direction. The above scheme is used to achieve the delay of the self-circulating part following the rotation of the moving part. The self-circulating part is driven by the rotation of the moving part. When the moving part rotates to the final gear in the adjustment direction, the cam is located at the rear end of the arc-shaped waist hole. The moving part continues to rotate in the adjustment direction. The cam of the moving part can drive the self-circulating part to rotate and make the self-circulating part press against the slider, so that the locking teeth and ratchet teeth on the slider are always kept disengaged. At this time, the moving part can rotate in the resetting direction. After the cam returns to the front end of the arc-shaped waist hole and continues to rotate, the slider can be unlocked. The slider is reset under the action of the spring, so that the locking teeth and ratchet teeth are engaged again.

[0010] Preferably, the self-circulating member is provided with an anti-slip boss, which is configured so that after the two self-circulating members push the two sliders close to each other, the anti-slip boss abuts against the slider, preventing the self-circulating member from disengaging from the slider during the resetting process of the moving member and causing the ratchet and the locking tooth to mesh. After the self-circulating member pushes the slider, the anti-slip boss abuts against the side of the slider, and the purpose of the anti-slip boss is to prevent the self-circulating member from rotating in advance and unlocking the slider, thereby ensuring that the self-circulating member and the slider can be unlocked and the locking tooth and the ratchet can be re-engaged after the moving member rotates in the resetting direction to be completely reset.

[0011] Preferably, the linkage mechanism includes two gears, which are meshed and arranged transversely in the base; the linkage portion includes a plurality of meshing teeth, and the meshing teeth on the two moving parts are respectively meshed with the two gears. The plurality of gears can realize the linkage of the two moving parts, and the moving part on one side can rotate counterclockwise while the moving part on the other side rotates clockwise, thereby realizing the opening and closing movement of the two moving parts; and the gears are smaller in size, making the structure more compact.

[0012] Preferably, the moving part includes a rotating part, the linkage part and the gear part are both arranged on the rotating part, and the linkage part and the gear part are both arranged toward the middle of the base; the base is provided with a linkage accommodating space, a sliding accommodating space and two rotating accommodating spaces, the rotating parts of the two moving parts are respectively arranged in the two rotating accommodating spaces, the two accommodating spaces are symmetrically arranged on the base and located at the left and right ends of the base, the linkage mechanism is arranged in the linkage accommodating space, and the locking mechanism is arranged in the sliding accommodating space.

[0013] Preferably, the linkage mechanism and the locking mechanism are arranged at intervals on the base, and the linkage part and the shift part are arranged at intervals on the moving part. Such an arrangement can make the overall structure simpler and more compact.

[0014] The design starting point, concept and beneficial effects of the utility model using the above technical solution are:

[0015] The movement device of the mechanism is provided with a linkage mechanism and a locking mechanism, and the two mechanisms act on the moving parts with their respective functions. The moving parts on both sides are linked by the linkage mechanism and the linkage part, and when the moving part on one side is rotated, the moving part on the other side can be rotated together; the gear adjustment is realized by the gear part and the locking mechanism, and the moving part can be kept in the position after rotation after rotating in the adjustment direction, so that the state of the mechanism after adjustment can be changed and maintained stable; the locking mechanism is disengaged from the gear part by the self-circulation part to realize the self-circulation adjustment of the moving part, and after the locking mechanism is disengaged from the gear part, the moving part can be rotated in the resetting direction, and the moving part can be reset to the initial state, so that the moving part can be adjusted again from the initial state; therefore, the mechanism can realize both the linkage of the moving parts on both sides and the self-circulation adjustment, and makes the operation simpler and more convenient while achieving the functional effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The three-dimensional structure of the chair back device in the embodiment of the utility model is shown in FIG. Figure 1 ;

[0017] Figure 2 The three-dimensional structure of the chair back device in the embodiment of the utility model is shown in FIG. Figure 2 ;

[0018] Figure 3 This is a schematic diagram of the three-dimensional structure of the waist support and the armrest frame abutting against each other in the embodiment of the utility model;

[0019] Figure 4 An exploded view of the handrail frame in the embodiment of the utility model;

[0020] Figure 5 It is a schematic diagram of the three-dimensional structure of the handrail frame in the embodiment of the utility model;

[0021] Figure 6 This is a schematic diagram of the three-dimensional structure of the handrail frame arranged on the sports device in the embodiment of the utility model;

[0022] Figure 7 This is a schematic diagram of the three-dimensional structure of the base in the embodiment of the utility model;

[0023] Figure 8 It is a front view of the base in the embodiment of the utility model;

[0024] Fig. 9 This is a schematic diagram of a three-dimensional structure in which a linkage mechanism and a locking mechanism are arranged on a base in an embodiment of the utility model;

[0025] Fig.10 It is a three-dimensional structural schematic diagram of the meshing teeth on the linkage part and the gear in the embodiment of the utility model;

[0026] Fig.11 The three-dimensional structure diagram of the utility model in which the ratchet teeth on the gear part are meshed with the locking teeth of the slider and the convex shaft is located at the front end of the arc waist hole Figure 1 ;

[0027] Fig.12 The three-dimensional structure diagram of the utility model in which the ratchet teeth on the gear part are meshed with the locking teeth of the slider and the convex shaft is located at the front end of the arc waist hole Figure 2 ;

[0028] Fig.13 The three-dimensional structure diagram of the utility model is that after the handrail frame is closed and rotated in the embodiment, the ratchet teeth on the gear part are engaged with the locking teeth of the slider and the convex shaft is located at the rear end of the arc waist hole Figure 1 ;

[0029] Fig.14 The three-dimensional structure diagram of the utility model is that after the handrail frame is closed and rotated in the embodiment, the ratchet teeth on the gear part are engaged with the locking teeth of the slider and the convex shaft is located at the rear end of the arc waist hole Figure 2 ;

[0030] Fig.15 The three-dimensional structure diagram of the self-circulating member pushing the slider to disengage the ratchet and the locking tooth in the embodiment of the utility model is shown in FIG. Figure 1 ;

[0031] Fig.16 The three-dimensional structure diagram of the self-circulating member pushing the slider to disengage the ratchet and the locking tooth in the embodiment of the utility model is shown in FIG. Figure 2 ;

[0032] Fig.17 A bottom view of the embodiment of the utility model in which the self-circulating member pushes the slider to disengage the ratchet teeth from the locking teeth;

[0033] Fig.18 In the embodiment of the utility model, when the ratchet and the locking tooth are disengaged, the angle between the two functional parts on the base is Figure 6 Smaller;

[0034] Fig.19 It is a three-dimensional structural schematic diagram of the functional parts in the embodiment of the utility model;

[0035] Fig. 20 It is a three-dimensional structural schematic diagram of the self-circulating member in the embodiment of the utility model;

[0036] Fig.21 An exploded view of a lumbar support in an embodiment of the utility model;

[0037] Fig. 22 It is a front view of the back plate in the embodiment of the utility model;

[0038] Fig.23 This is a schematic diagram of the three-dimensional structure of the backing plate in the embodiment of the utility model;

[0039] Fig.24 It is a three-dimensional structural schematic diagram of the linkage mechanism and the locking mechanism acting on the moving part in the embodiment of the utility model.

[0040] The reference numerals of the figures are as follows: back support 1; sports device 2; lumbar support 3; backrest 31; cushion 32; armrest frame 4; main body 5; functional part 6; connecting part 61; rotating part 62; convex seat 7; head 71; base 8; rotating accommodating space 9; sliding accommodating space 10; linkage accommodating space 11; first rotating shaft 12; gear part 13; ratchet 131; linkage part 14; meshing tooth 141; gear 15; second rotating shaft 16; slider 17; locking tooth 171; spring 18; self-circulating part 19; arc-shaped lumbar support 191; front end 1911; rear end 1912; anti-slip boss 192; avoidance groove 20; convex shaft 21; hollow 22; groove 23. DETAILED DESCRIPTION

[0041] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0042] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0043] In the description of the present invention, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0044] The specific implementation of the utility model is as follows:

[0045] like Fig.24As shown, the utility model provides an adjustment mechanism that is easy to operate, including a moving device and two moving parts located on both sides of the moving device, the two moving parts are linked with the linkage mechanism in the moving device through the linkage parts thereon, and the moving part realizes the rotation of the moving part in the adjustment direction and the limitation of the moving part in the reset direction through the gear part thereon and the locking mechanism in the moving device; the self-circulation part arranged on the moving part is configured to delay the rotation of the moving part, and after the self-circulation part rotates with the moving part in the adjustment direction, the gear part is disengaged from the locking mechanism, and the moving part can rotate in the reset direction to realize reset; therefore, the mechanism can realize the linkage of the moving parts on both sides and the self-circulation adjustment, and makes the operation simpler and more convenient while achieving the functional effect.

[0046] Specifically, the mechanism is used in a waist-clamping chair back device, such as Figure 1-3 As shown, the device includes a back support 1, a movement device 2, a lumbar support 3 and two armrest frames 4 arranged on both sides of the movement device 2, the lumbar support 3 is installed on the movement device 2, the movement device 2 is installed on the back support 1, and the two armrest frames 4 are rotatably arranged on the movement device 2 around a vertical axis; the lumbar support 3 is located between the two armrest frames 4, and the lumbar support 3 and the two armrest frames 4 are in abutment and sliding cooperation, and the movement device 2 is configured to link the armrest frames 4 on both sides to rotate, so that the two armrest frames 4 are opened and closed synchronously, and the two armrest frames 4 are maintained at the current rotation position; when the two armrest frames 4 are closed and rotated, the lumbar support 3 and the armrest frames 4 slide relative to each other, and the armrest frames 4 drive the two ends of the lumbar support 3 to approach each other and close and embrace the human waist; when the two armrest frames 4 are opened and rotated, the lumbar support 3 and the armrest frames 4 slide relative to each other, and the armrest frames 4 drive the two ends of the lumbar support 3 to move away from each other and open.

[0047] The chair back device can, on the one hand, provide variable support and a wrapping feeling for the waist, so that the waist support 3 can more effectively support the human waist and improve comfort; on the other hand, it can correct the sitting posture, enhance the supporting effect of the waist support 3 on the human lumbar vertebrae, reduce the pressure on the waist and spine, and make people not feel tired when sitting for a long time; under the action of the motion device 2, the two armrest frames 4 rotate synchronously in opposite directions, so as to realize the synchronous opening and closing movement of the two armrest frames 4, and the armrest frames 4 slide against the waist support 3, so as to further realize the opening and closing movement of the armrest frames 4 to drive the opening and closing movement of the waist support 3, which is very simple and convenient to operate and is conducive to user adjustment; because the two armrest frames 4 are linked, the rotation directions are different but the rotation angles are the same, so as to realize the symmetrical opening and closing movement of the two ends of the waist support 3, so that the waist support 3 can clamp the waist more correctly and vertically, and the waist protection effect is strong.

[0048] Specifically, if Figure 3-5As shown, the lumbar support 3 is installed on the sports device 2 and is located in front of the sports device 2. The two armrest frames 4 extend outward from the sports device 2 and bend forward at the same time. Therefore, in the left and right directions, the sports device 2 and the two armrest frames 4 have a convex curvature toward the rear as a whole, and the lumbar support 3 generally also has a convex curvature toward the rear. The sports device 2 and the two armrest frames 4 are adapted to the lumbar support 3 as a whole; the armrest frame 4 includes a main body 5 and a functional part 6, the main body 5 is fixedly connected to the functional part 6, and the main body 5 of the armrest frame 4 is connected to the functional part 6. The lumbar support 3 is butted against each other by a convex seat 7 having a rounded head 71. The convex seat 7 is approximately a triangular prism, and one of the edges of the head 71 is rounded to become rounded; the convex seat 7 can be set on the armrest 4 or the backboard 31. In this embodiment, the convex seat 7 is set on the lumbar support 3, and the convex seat 7 protrudes from the lumbar support 3 and the head 71 of the convex seat 7 faces the armrest 4. The main body 5 of the armrest 4 abuts against the head 71 of the convex seat 7. The rounded head 71 of the convex seat 7 can reduce the friction during abutment and sliding. Of course, the armrest 4 and the lumbar support 3 can also be butted against each other in a variety of ways, such as setting a rolling ball in the armrest 4 or the lumbar support 3.

[0049] In this embodiment, the moving part is the functional part 6 in the armrest 4, the adjustment direction is the direction of the armrest 4 closing and rotating, and the reset direction is the direction of the armrest 4 opening and rotating.

[0050] like Figure 5-9As shown, the motion device 2 includes a base 8, which is lifted and lowered on the back support 1. The base 8 has a plurality of accommodating spaces, including a rotating accommodating space 9, a sliding accommodating space 10, and a linkage accommodating space 11. There are two rotating accommodating spaces 9, which are symmetrically arranged on the base 8 and located at the left and right ends of the base 8. The functional part 6 of the armrest frame 4 includes a connecting portion 61 and a rotating portion 62. The connecting portion 61 and the rotating portion 62 are integrally formed, and the connecting portion 61 and the main body of the armrest frame 4 are connected. 5 is fixedly connected, the rotating part 62 is arranged in the rotating accommodation space 9, the rotating part 62 is roughly semi-cylindrical, and the side surface thereof located in the rotating accommodation space 9 is a circular arc surface. Correspondingly, the wall of the rotating accommodation space 9 is a circular arc surface. The rotating part 62 is provided with a first rotating shaft 12 connected to the base 8 at the central axis of the circular arc surface. The handrail frame 4 is rotatably connected to the base 8 through the rotating part 62 and the first rotating shaft 12; the base 8 is provided with a linkage mechanism in the linkage accommodation space 11, and the base 8 is in the sliding accommodation space 10 is provided with a locking mechanism, and the linkage mechanism and the locking mechanism are arranged at intervals on the base 8. Correspondingly, the functional part 6 of the armrest frame 4 is provided with a gear portion 13 on the side of the rotating part 62 facing the sliding accommodating space 10, and the functional part 6 of the armrest frame 4 is provided with a linkage portion 14 on the side of the rotating part 62 facing the linkage accommodating space 11. The linkage portion 14 and the gear portion 13 are arranged at intervals on the armrest frame 4. Such an arrangement can make the overall structure simpler and more compact; in this embodiment, the linkage portion 14 is located above the gear portion 13, and the linkage accommodating space 11 is located above the sliding accommodating space 10 and the two are separated; the functional part 6 is rotatably connected to the base 8, and the linkage portion 14 and the gear portion 13 are both arranged on the functional part 6. Directly arranging the linkage portion 14 and the gear portion 13 on the main body 5 of the armrest frame 4 will make the overall structure of the main body 5 very complicated, and the mold opening and manufacturing costs are too high. After the armrest frame 4 is divided into the main body 5 and the functional part 6, the structure of the main body 5 is simple, and the volume of the functional part 6 is smaller, thereby reducing the mold opening and manufacturing costs.

[0051] like Figure 6 , 9As shown in Figures 10, the linkage part 14 on the handrail frame 4 is connected to the linkage mechanism on the base 8 by transmission. The linkage part 14 and the linkage mechanism are configured so that when the handrail frame 4 on one side rotates, the linkage part 14 is transmitted to the linkage part 14 of the handrail frame 4 on the other side through the linkage mechanism and drives the handrail frame 4 on the other side to rotate. The linkage part 14 on the handrail frame 4 cooperates with the linkage mechanism in the motion device 2 to realize the synchronous opening and closing linkage of the handrail frames 4 on both sides. Specifically, the linkage mechanism includes two gears 15, which are meshed and arranged laterally in the linkage accommodating space 11 of the base 8. The linkage accommodating space 11 is horizontally connected with the rotating accommodating space 9 on both sides, and the two gears 15 are rotatably connected to the base 8 through a vertical second rotating shaft 16; the linkage part 14 includes a plurality of meshing teeth 141, and the meshing teeth 141 on the two handrails 4 are respectively meshed with the two gears 15; through the plurality of gears 15, while realizing the linkage of the two handrails 4, the handrail 4 on one side can be rotated counterclockwise and the handrail 4 on the other side can be rotated clockwise, thereby realizing the opening and closing movement of the two handrails 4; and the gear 15 is smaller in size, making the structure more compact.

[0052] like Figure 11-20 As shown, the gear portion 13 on the armrest 4 cooperates with the locking mechanism on the base 8, and the gear portion 13 and the locking mechanism are configured to keep the current position of the armrest 4 after rotation, and the gear portion 13 and the locking mechanism allow the rotation of the armrest 4 to have multiple gears, so that the armrest 4 can stay in the current position after rotation; specifically, the gear portion 13 includes a plurality of ratchets 131 arranged toward the sliding accommodating space 10; the locking mechanism includes two sliders 17 symmetrically arranged on the base 8 and a spring 18 arranged between the two sliders 17, the two sliders 17 are slidably arranged in the sliding accommodating space 10 of the base 8, and the sliding accommodating space 10 is horizontally connected with the rotating accommodating space 9 on both sides; the slider 17 includes a locking tooth 171 meshing with the ratchet 131, and the ratchet 131 and the locking tooth 171 are one-way self-locking; the lock The fixed tooth 171 is located at one end of the slider 17 facing the armrest, and the spring 18 is inserted in the other end of the slider 17; there are multiple locking teeth 171, and when the two armrest frames 4 are closed and rotated, the locking teeth 171 engage with different ratchet teeth 131 and switch between different ratchet teeth 131; when the two armrest frames 4 have a tendency to open and rotate, the ratchet teeth 131 and the locking teeth 171 are self-locking; the one-way self-locking of the ratchet teeth 131 and the locking teeth 171 can achieve the effect of keeping the armrest frame 4 in the current position after rotation, thereby realizing the function of the gear position; the spring 18 allows the two sliders 17 to slide and reset, and when the armrest frames 4 are closed and rotated, the two sliders 17 slide close to each other, allowing the locking teeth 171 to switch between different ratchet teeth 131; a plurality of locking teeth 171 can increase the stability when the locking teeth 171 are engaged with the ratchet teeth 131.

[0053] The handrail frame 4 is provided with a coaxially rotating self-circulating part 19, specifically, an avoidance groove 20 is opened on the rotating part 62, the self-circulating part 19 is arranged in the avoidance groove 20, and the self-circulating part 19 is arranged on the first rotating shaft 12, and the self-circulating part 19 can rotate around the first rotating shaft 12 relative to the base 8; further, an arc-shaped waist hole is opened on the self-circulating part 19, and the arc-shaped waist hole is arranged at the end of the self-circulating part 19 away from the first rotating shaft 12, and the handrail frame 4 is provided with a convex shaft 21 inserted in the arc-shaped waist hole, and when the handrail frame 4 rotates, the convex shaft 21 moves in the arc-shaped waist hole; specifically, the convex shaft 21 is arranged on the rotating part 62, the convex shaft 21 is arranged on the groove wall of the avoidance groove 20 and the convex shaft 21 protrudes downward from the groove wall of the avoidance groove 20.

[0054] like Fig. 20 As shown, the arc-shaped waist hole has a front end 1911 and a rear end 1912, and the self-circulating member 19 is configured such that when the two handrail frames 4 are fully opened, the convex shaft 21 is located at the front end 1911 of the arc-shaped waist hole, and when the two handrail frames 4 are closed, the convex shaft 21 moves from the front end 1911 of the arc-shaped waist hole to the rear end 1912; after the convex shaft 21 abuts against the rear end 1912 of the arc-shaped waist hole, the two handrail frames 4 continue to close, and the convex shaft 21 drives the self-circulating member 19 to rotate, and the two self-circulating members 19 push the two sliders 17 to approach each other and disengage the ratchet 131 from the locking tooth 171, so that the two handrail frames 4 can be opened and reset; in other words, the self-circulating member 1 9 is driven by the rotation of the handrail frame 4. When the handrail frame 4 is closed and rotated to the final gear, the convex shaft 21 is located at the rear end 1912 of the arc-shaped waist hole. The handrail frame 4 is continued to be closed and rotated, and the convex shaft 21 of the handrail frame 4 can drive the self-circulating member 19 to rotate, and the self-circulating member 19 is allowed to abut against the slider 17, so that the locking tooth 171 on the slider 17 and the ratchet 131 are always kept disengaged. At this time, the handrail frame 4 can be opened and rotated. After the convex shaft 21 returns to the front end 1911 of the arc-shaped waist hole, it continues to rotate to unlock the slider 17. The slider 17 is reset under the action of the spring 18, so that the locking tooth 171 and the ratchet 131 are re-engaged.

[0055] Furthermore, an anti-slip boss 192 is provided on the self-circulating part 19, and the anti-slip boss 192 is configured to abut against the slider 17 after the two self-circulating parts 19 push the two sliders 17 closer to each other, thereby preventing the self-circulating part 19 and the slider 17 from disengaging during the return process of the handrail frame 4 and causing the ratchet 131 to engage with the locking tooth 171; after the self-circulating part 19 pushes the slider 17, the anti-slip boss 192 abuts against the side of the slider 17. The purpose of the anti-slip boss 192 is to prevent the self-circulating part 19 from rotating prematurely and unlocking the slider 17, thereby ensuring that the self-circulating part 19 and the slider 17 can be unlocked and the locking tooth 171 can be re-engaged with the ratchet 131 after the handrail frame 4 is opened, rotated and completely reset.

[0056] like Figure 21-23As shown, there are many ways to achieve the opening and closing movement of the lumbar support 3, such as hingedly connecting the two side wings of the lumbar support 3 to the middle part of the lumbar support 3. In the present solution, the opening and closing of the lumbar support 3 is achieved directly through the elasticity of the lumbar support 3, which has a simple structure and lower cost. Specifically, the lumbar support 3 is elastic. When the two armrests 4 are closed and rotated, the lumbar support 3 and the armrests 4 slide relative to each other, and at the same time, the lumbar support 3 produces elastic deformation of the two ends closing and embracing the human waist. When the two armrests 4 are opened and rotated, the lumbar support 3 and the armrests 4 slide relative to each other, and at the same time, the lumbar support 3 restores the elastic deformation. More specifically, the lumbar support 3 includes a backrest plate 31 and a soft cushion 32 covered on the backrest plate 31, the backrest plate 31 is an elastic plastic part, and the protrusion 7 is arranged on the backrest plate 31. The soft cushion 32 increases the comfort, and the elastic backrest plate 31 can be deformed with the opening and closing of the armrests 4.

[0057] Furthermore, a plurality of vertical hollows 22 and a plurality of grooves 23 are provided on the backing plate 31 , and the deformation capacity of the backing plate 31 is increased by providing the hollows 22 and the grooves 23 on the backing plate 31 .

Claims

1. An easy-to-operate adjustment mechanism, characterized in that: The invention comprises a moving device and two moving parts located on both sides of the moving device, the moving device comprises a base, and the two moving parts are both rotatably arranged on the base; a linkage mechanism and a locking mechanism are provided on the base, and a linkage part and a shift part are correspondingly provided on the moving parts, the linkage part is transmission-connected with the linkage mechanism, and the linkage mechanism is configured to make the two moving parts rotate simultaneously; the rotation direction of the moving parts is divided into an adjustment direction and a reset direction in opposite directions, the shift part cooperates with the locking mechanism and is configured to limit the moving parts from rotating in the reset direction when the moving parts rotate in the adjustment direction, and keep the moving parts in the position after the rotation; a coaxially rotating self-circulating part is also provided on the moving parts, the self-circulating part is configured to delay and follow the rotation of the moving parts, and after the self-circulating part rotates in the adjustment direction with the moving parts, the shift part is disengaged from the locking mechanism, and the moving parts can rotate in the reset direction to achieve reset.

2. The easy-to-operate adjustment mechanism according to claim 1, characterized in that: The gear portion includes a plurality of ratchets; the locking mechanism includes two sliders symmetrically arranged on the base and a spring arranged between the two sliders, the two sliders are slidably arranged on the base, the sliders include locking teeth meshing with the ratchets, and the ratchets and the locking teeth are one-way self-locking; when the two moving parts rotate in the adjustment direction, the locking teeth are meshed with different ratchets; when the two moving parts have a tendency to rotate in the reset direction, the ratchets and the locking teeth are self-locking.

3. The easy-to-operate adjustment mechanism according to claim 2, characterized in that: An arc-shaped waist hole is provided on the self-circulating part, and a convex shaft inserted in the arc-shaped waist hole is provided on the moving part. When the moving part rotates, the convex shaft moves in the arc-shaped waist hole; the arc-shaped waist hole has a front end and a rear end, and the self-circulating part is configured so that when the two moving parts are in an initial state, the convex shaft is located at the front end of the arc-shaped waist hole, and when the two moving parts rotate in the adjustment direction, the convex shaft moves from the front end to the rear end of the arc-shaped waist hole; after the convex shaft abuts against the rear end of the arc-shaped waist hole, the two moving parts continue to rotate in the adjustment direction, and the convex shaft drives the self-circulating parts to rotate, and the two self-circulating parts push the two sliders to approach each other and disengage the ratchet and the locking teeth, so that the two moving parts can rotate in the reset direction.

4. The easy-to-operate adjustment mechanism according to claim 3, characterized in that: An anti-slip boss is provided on the self-circulating part, and the anti-slip boss is configured so that after the two self-circulating parts push the two sliders closer to each other, the anti-slip boss abuts against the slider to prevent the self-circulating part from disengaging from the slider during the resetting process of the moving part, causing the ratchet and the locking tooth to engage.

5. The easy-to-operate adjustment mechanism according to claim 1, characterized in that: The linkage mechanism comprises two gears, which are meshed and arranged transversely in the base; the linkage part comprises a plurality of meshing teeth, and the meshing teeth on the two moving parts are respectively meshed with the two gears.

6. The easy-to-operate adjustment mechanism according to claim 1, characterized in that: The moving part includes a rotating part, and the linkage part and the gear part are both arranged on the rotating part, and the linkage part and the gear part are both arranged toward the middle of the base; the base is provided with a linkage accommodating space, a sliding accommodating space and two rotating accommodating spaces, the rotating parts of the two moving parts are respectively arranged in the two rotating accommodating spaces, the two accommodating spaces are symmetrically arranged on the base and located at the left and right ends of the base, the linkage mechanism is arranged in the linkage accommodating space, and the locking mechanism is arranged in the sliding accommodating space.

7. The easy-to-operate adjustment mechanism according to claim 1, characterized in that: The linkage mechanism and the locking mechanism are arranged at intervals on the base, and the linkage part and the shift part are arranged at intervals on the moving part.

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