Angle adjustment mechanism and seat

Abstract

The utility model provides an angle adjusting mechanism and seat, angle adjusting mechanism includes first main part, second main part, ratchet wheel, pawl and stop piece, second main part and first main part rotation connection, second main part includes limit groove, and limit groove includes first slot area and second slot area, ratchet wheel and first main part fixed connection, and ratchet wheel includes separation, reset and a plurality of ratchet tooth parts, and reset, ratchet tooth part and separation distribute along first direction in proper order, pawl and second main part rotation connection, and pawl includes claw tooth part, and the part of stop piece is movably arranged in limit groove, and stop piece and pawl swing joint. This angle adjusting mechanism simple structure, cost is lower, and its operation convenience is higher.

Description

TECHNICAL FIELD

[0001] The utility model relates to furniture technical field especially angle adjusting mechanism and seat chair. BACKGROUND

[0002] With the popularization of ergonomic chairs, it is a common practice to adopt angle-adjustable parts in the seat chair. These parts can be armrests, backrests, neck pillows, etc. These parts are usually connected with angle adjusting mechanisms. However, the current angle adjusting mechanisms are not high in operation convenience. When a user adjusts the angle of a part of the seat chair, he or she may need to perform multiple steps of operation, such as first finding the position of a certain adjusting component (e.g., a knob, a button, a pin, a handle, etc.), then operating the adjusting component to unlock, then performing fine adjustment of the angle, and finally locking again. These steps consume the time and energy of the user, especially when a quick adjustment is needed, which may cause the user to feel annoyed. SUMMARY

[0003] The utility model aims at solving at least one of the technical problems existing in the prior art. To this end, the utility model provides an angle adjusting mechanism, which is high in operation convenience.

[0004] The utility model further provides a seat chair comprising the above angle adjusting mechanism.

[0005] An angle adjustment mechanism according to a first aspect embodiment of the present invention includes: a first body; a second body rotatably connected to the first body, the second body including a limiting groove, the limiting groove including a first groove area and a second groove area; a ratchet fixedly connected to the first body, the ratchet including a separation part, a reset part and a plurality of ratchet teeth, the reset part, the ratchet teeth and the separation part being sequentially distributed along a first direction; a pawl rotatably connected to the second body, the pawl including pawl teeth; a limiting member, a portion of the limiting member being movably disposed in the limiting groove, and the limiting member being movably connected to the pawl; when the pawl is in a first state, the limiting member is located in the first groove area, the ratchet teeth and the pawl teeth are engaged, the second body can rotate relative to the first body along the first direction, and the ratchet teeth and the pawl teeth can obstruct the second body from rotating. The body rotates relative to the first body in a second direction; when the pawl is in the second state, the limiting member is located in the second groove area, the ratchet portion and the claw portion are separated from each other, and the second body can rotate relative to the first body in a second direction, which is opposite to the first direction; during the rotation of the pawl in the first direction, the separating portion can abut against the pawl to make the claw portion rotate in a direction away from the ratchet portion, and to make the limiting member move from the first groove area to the second groove area, thereby switching the pawl from the first state to the second state; during the rotation of the pawl in the second direction, the resetting portion can abut against the pawl to make the claw portion rotate in a direction close to the ratchet portion, and to make the limiting member move from the second groove area to the first groove area, thereby switching the pawl from the first state to the second state.

[0006] The angle adjustment mechanism according to the first aspect embodiment of the present invention has at least the following beneficial effects:

[0007] When the user needs to adjust the angle of the second main body or an object connected to it, the user can pull, push, or bend the second main body to rotate it in the first direction. Furthermore, when the claw and ratchet parts engage, the angle of the second main body is fixed. When the user needs to reset the second main body, the user can first continue rotating it in the first direction until the separation part disengages the ratchet and claw parts, and then the user rotates the second main body in the second direction.

[0008] Based on the cooperation of the pawl and the ratchet, the angle adjusting mechanism has a self-locking function, and a user only needs to release the hand to fix the second body at a certain angle (when the pawl is in the first state), and the user does not need to operate buttons, knobs, pins, handles and other components to unlock or lock the second body, so that the angle adjusting mechanism is simple in structure and high in operation convenience.

[0009] According to some embodiments of the utility model, the angle adjusting mechanism further includes an elastic member, two ends of the elastic member are connected with the second body and the limiting member respectively; when the pawl is in the first state, the elastic force of the elastic member is used to keep the limiting member in the first slot area; when the pawl is in the second state, the elastic force of the elastic member is used to keep the limiting member in the second slot area.

[0010] According to some embodiments of the utility model, the elastic member is a spring piece, the spring piece is arranged in a bent manner, and one side surface of the spring piece abuts against the limiting member.

[0011] According to some embodiments of the utility model, the pawl further includes a driving hole, the driving hole and the claw tooth are located at two ends of the pawl respectively, the limiting member is movably arranged in the driving hole, two ends of the limiting member are located in two limiting grooves respectively, and a hole wall of the driving hole is used to contact the limiting member and push the limiting member to move in the limiting groove.

[0012] According to some embodiments of the utility model, the hole wall of the driving hole includes: a first wall surface, when the pawl is in the first state, the first wall surface abuts against the limiting member and is distributed in the first direction in sequence; a second wall surface, the second wall surface is connected with the first wall surface, and the second wall surface is located on the side of the limiting member away from the ratchet; and a third wall surface, two ends of the third wall surface are connected with the first wall surface and the second wall surface respectively, the third wall surface is arranged in an inclined manner, and two ends of the third wall surface are arranged in a manner of being spaced apart along the circumferential direction of the ratchet and being spaced apart along the radial direction of the ratchet; in the process that the second body rotates in the first direction until the separating part abuts against the pawl, the first wall surface and the elastic member push the limiting member to move, so that the limiting member is transferred from the first slot area to the second slot area; in the process that the second body rotates in the second direction until the reset part abuts against the pawl, the third wall surface pushes the limiting member to move, so that the limiting member is transferred from the second slot area to the first slot area.

[0013] According to some embodiments of the utility model, the limiting groove is arranged in a bent manner, the first slot area and the second slot area are staggered along the radial direction of the pawl; and the first slot area and the second slot area are at least partially staggered along the circumferential direction of the pawl.

[0014] According to some embodiments of the present utility model, the second slot region is located on one side of the first slot region, and the second slot region protrudes towards the ratchet wheel relative to the first slot region.

[0015] According to the seat of the second aspect of the present utility model, the angle adjusting mechanism is as described in the first aspect.

[0016] According to some embodiments of the present utility model, the seat comprises an armrest, the armrest comprises a first support and a second support, the first support is connected with the first main body, and the second support is connected with the second main body.

[0017] According to some embodiments of the present utility model, the first support is located in front of the second support, and the rear end of the second support can rotate upwards and downwards relative to the first support.

[0018] Additional aspects and advantages of the present utility model will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF DRAWINGS

[0019] The present utility model will be further described below in combination with the drawings and embodiments, wherein:

[0020] Figure 1 It is a side view of the armrest in the first state in one embodiment of the present utility model;

[0021] Figure 2 It is a schematic view of the armrest in the second state in one embodiment of the present utility model;

[0022] Figure 3 It is a schematic view of the state after the shell of the armrest is partially disassembled;

[0023] Figure 4 It is Figure 3 It is an exploded view of the armrest shown;

[0024] Figure 5 It is a schematic view of the process of upward rotation of the second main body;

[0025] Figure 6 It is a schematic view of the movement process of the limiting piece in the process of upward rotation of the second main body;

[0026] Figure 7 It is a schematic view of the process of downward rotation of the second main body;

[0027] Figure 8 It is a schematic view of the movement process of the limiting piece in the process of downward rotation of the second main body.

[0028] Reference signs: 101 - handrail, 102 - first support, 103 - second support, 104 - first main body, 105 - second main body, 106 - connecting arm, 107 - stand, 108 - angle adjusting mechanism, 109 - screw, 110 - elastic member, 111 - first pin shaft, 112 - second pin shaft, 113 - ratchet, 114 - pawl, 115 - limiting member, 116 - limiting groove, 117 - third shaft hole, 118 - second shaft hole, 119 - first shaft hole, 120 - driving hole, 121 - embedded part, 122 - separation part, 123 - ratchet part, 124 - reset part, 125 - pawl part, 126 - first wall surface, 127 - second wall surface, 128 - third wall surface, 129 - first groove area, 130 - second groove area. DETAILED DESCRIPTION

[0029] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are only used to explain the present application and cannot be understood as a limitation of the present application.

[0030] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation of the present application. The device or element indicated is necessarily constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0031] In the description of the present application, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0032] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0033] Figure 1 A handrail 101 of one embodiment of the present application is shown, which can be applied in a seat. As shown in FIG. 1, the handrail 101 includes a first support 102, a second support 103, a first main body 104, a second main body 105, a connecting arm 106, a stand 107, an angle adjusting mechanism 108, a screw 109, an elastic member 110, a first pin shaft 111, a second pin shaft 112, a ratchet 113, a pawl 114, a limiting member 115, a limiting groove 116, a third shaft hole 117, a second shaft hole 118, a first shaft hole 119, a driving hole 120, an embedded part 121, a separation part 122, a ratchet part 123, a reset part 124, a pawl part 125, a first wall surface 126, a second wall surface 127, a third wall surface 128, a first groove area 129, and a second groove area 130. Figure 1As shown, the handrail 101 includes a column 107, a connecting arm 106, a first support member 102, and a second support member 103. The second support member 103 is located behind the first support member 102, and its rear end is capable of rotating upwards and downwards relative to the first support member 102. The state of the rear end of the second support member 103 after rotating upwards is as follows... Figure 2 As shown, in Figure 2 In the indicated state, the first support 102 can support the user's forearm, the second support 103 can block the user's elbow joint, and the armrest 101 can provide good support and positioning for the user's arm.

[0034] The handrail 101 also includes an angle adjustment mechanism 108, and the first support member 102 and the second support member 103 are connected through the angle adjustment mechanism 108. Figure 3 An angle adjustment mechanism 108 is shown. The angle adjustment mechanism 108 includes a first body 104, a second body 105, a ratchet 113, a pawl 114, and a limiting member 115 (the limiting member 115 is as follows). Figure 4 As shown). Figure 1 and Figure 2 As shown, the first main body 104 is connected to the first support member 102. The connection method between the two can be snap-fit, screw connection 109, magnetic connection, etc. The first main body 104 can be located at the bottom of the first support member 102. The second main body 105 is connected to the second support member 103. The connection method between the two can be snap-fit, screw connection 109, magnetic connection, etc. The second main body 105 can be located at the bottom of the second support member 103. After the handrail 101 is assembled, the first support member 102 and the second support member 103 can cover the ratchet 113, pawl 114 and limiting member 115 to improve the aesthetics of the handrail 101.

[0035] The first body 104 and the second body 105 are rotatably connected, thereby allowing the second support 103 to rotate relative to the first support 102. The ratchet 113 is fixedly connected to the first body 104, while the pawl 114 is rotatably connected to the second body 105. The following describes the process in conjunction with... Figure 4 and Figure 5 The specific connection relationship between the first body 104, the second body 105, the pawl 114, and the ratchet 113 is illustrated with an example. Figure 4As shown, the angle adjusting mechanism 108 further comprises a first pin shaft 111 and a second pin shaft 112. The rear end of the first body 104 has two first shaft holes 119, and the second body 105 has two second shaft holes 118 and two third shaft holes 117. After the armrest 101 or the angle adjusting mechanism 108 is assembled, the ratchet wheel 113 is located between the two first shaft holes 119, the two first shaft holes 119 are located between the two second shaft holes 118, the first pin shaft 111 is arranged through the two second shaft holes 118, the two first shaft holes 119, and the ratchet wheel 113. In this way, the second body 105 can rotate relative to the first body 104 about the first pin shaft 111. After the armrest 101 or the angle adjusting mechanism 108 is assembled, the pawl 114 is located between the two third shaft holes 117, and the second pin shaft 112 is arranged through the two third shaft holes 117 and the pawl 114. In this way, the pawl 114 can rotate relative to the second body 105 about the second pin shaft 112. As shown in Figure 5 (a), the ratchet wheel 113 comprises an embedded part 121 embedded in a groove of the first body 104. In this way, the ratchet wheel 113 cannot rotate relative to the first body 104, and the ratchet wheel 113 remains relatively fixed with the first body 104.

[0036] As shown in Figure 5 , the ratchet wheel 113 comprises a separation part 122, a reset part 124, and a plurality of ratchet teeth 123, and the reset part 124, the ratchet teeth 123, and the separation part 122 are sequentially arranged along a first direction. In Figure 5 , the first direction is counterclockwise. The pawl 114 comprises a pawl tooth part 125 capable of engaging with the ratchet teeth 123. The engagement between the two means that a tooth gap is formed between any two adjacent ratchet teeth 123, the pawl tooth part 125 is arranged in one of the tooth gaps, and if the second body 105 rotates in the first direction subsequently, the pawl tooth part 125 can move out of one tooth gap and enter another tooth gap.

[0037] As shown in Figure 4 , the second body 105 is provided with a limiting groove 116, a part of the limiting member 115 is movably arranged in the limiting groove 116, and the pawl 114 is movably connected with the limiting member 115. The limiting member 115 can move relative to the pawl 114. As shown in Figure 6 , the limiting groove 116 comprises a first groove area 129 and a second groove area 130, and the limiting member 115 can move between the two groove areas. The limiting member 115 can constrain the angle of the pawl 114, so that the pawl 114 remains in the first state or the second state.

[0038] The working principle of the angle adjusting mechanism 108 will be introduced below. Figure 5 to Figure 8 As shown in Figure 5 , the rear end of the second body 105 is shown to rotate upward.Figure 6 The position change of the limit member 115 during the upward rotation of the second body 105 is shown, Figure 7 The downward rotation of the rear end of the second body 105 is shown, Figure 8 The position change of the limit member 115 during the downward rotation of the second body 105 is shown. Figure 5 and Figure 7 The same cross section is selected, Figure 6 and Figure 8 The same cross section is selected, but Figure 5 and Figure 6 The selected cross sections are different. The first direction can be counterclockwise, and the second direction can be clockwise, which are opposite directions.

[0039] The pawl 114 of the angle adjustment mechanism 108 has a first state, in Figure 5 (a) and Figure 5 (c), the pawl 114 is in the first state. When the pawl 114 is in the first state, the ratchet teeth 123 are engaged with the pawl teeth 125, and the second body 105 can rotate relative to the first body 104 in the first direction. Also, as shown in Figure 6 (a) and Figure 6 (c), the limit member 115 is located in the first groove area 129 at this time.

[0040] Taking the state shown in Figure 5 (a) as the initial state, when the second body 105 rotates upward around the first pin shaft 111, the pawl 114, the limit member 115, and the second pin shaft 112 will also rotate upward with the second body 105. As shown in Figure 5 (b), after the pawl 114 rotates upward with the second body 105, the ratchet teeth 123 will push away the pawl teeth 125, the pawl 114 will rotate counterclockwise around the second pin shaft 112, and a part of the pawl teeth 125 will be disengaged from the tooth groove. In this way, in the case where the ratchet teeth 123 are engaged with the pawl teeth 125, the second body 105 can rotate relative to the first body 104 in the first direction. However, if the second body 105 has a tendency to rotate downward around the second pin shaft 112, the ratchet teeth 123 will block the pawl teeth 125, the ratchet wheel 113 will hinder the clockwise rotation of the pawl 114, and thus hinder the downward rotation (rotation in the second direction) of the second body 105 relative to the first body 104.

[0041] Please refer to Figure 5 (a) to Figure 5(c), the claw tooth portion 125 will first disengage from one tooth groove and then enter another tooth groove during the rotation of the second body 105 in the first direction. When the claw tooth portion 125 is located in one tooth groove, the angle of the second body 105 is fixed at one gear position. By arranging a plurality of tooth grooves, a plurality of angle gear positions can be provided for the second body 105, thereby increasing the adjustability of the second body 105.

[0042] If the second body 105 continues to rotate in the first direction (upward rotation) based on the angle shown in Figure 5 (c), the second body 105 can be rotated to the angle shown in Figure 7 (a). As shown in Figure 7 (a), at this time, the pawl 114 of the angle adjusting mechanism 108 is in the second state, the limiting piece 115 is located in the second groove area 130 (as shown in Figure 7 (b), the ratchet tooth portion 123 and the claw tooth portion 125 are separated from each other. At this time, the distance between the end of the ratchet tooth portion 123 and the first pin shaft 111 is less than the distance between the end of the claw tooth portion 125 and the first pin shaft 111. In this way, the ratchet tooth portion 123 and the claw tooth portion 125 do not hinder the rotation of the second body 105, and the second body 105 can be rotated relative to the first body 104 in the second direction and can be rotated relative to the first body 104 in the second direction.

[0043] Next, how to switch the state of the pawl 114 to the first state and the second state will be introduced.

[0044] Please refer to Figure 5 (a), Figure 5 (b), Figure 5 (c), and Figure 7 (a), during the rotation of the pawl 114 in the first direction, the separation portion 122 will abut against the pawl 114, the claw tooth portion 125 will rotate in a direction away from the ratchet tooth portion 123, and the limiting piece 115 will be transferred from the first groove area 129 to the second groove area 130, thereby switching the pawl 114 from the first state to the second state. Wherein, "the claw tooth portion 125 rotates in a direction away from the ratchet tooth portion 123" specifically means that the claw tooth portion 125 rotates counterclockwise around the second pin shaft 112.

[0045] Please refer to Figure 7 (a) to Figure 7 (c), during the rotation of the pawl 114 in the second direction, the reset portion 124 will abut against the pawl 114, so that the claw tooth portion 125 rotates in a direction close to the ratchet tooth portion 123, and the limiting piece 115 is transferred from the second groove area 130 to the first groove area 129, thereby switching the pawl 114 from the first state to the second state. Wherein, "the claw tooth portion 125 rotates in a direction close to the ratchet tooth portion 123" specifically means that the claw tooth portion 125 rotates clockwise around the second pin shaft 112.

[0046] When the user needs to adjust the angle of the second body 105 or the object connected with the second body 105 (for example, the second support 103), the user can pull, push or pry the second body 105, so that the second body 105 rotates in the first direction. And when the claw tooth part 125 is engaged with the ratchet part 123, the angle of the second body 105 is fixed. When the user needs to reset the second body 105, the user can first continue to rotate the second body 105 in the first direction until the disengagement part 122 disengages the ratchet part 123 and the claw tooth part 125, and then the user rotates the second body 105 in the second direction.

[0047] Therefore, based on the cooperation of the pawl 114 and the ratchet wheel 113, the angle adjusting mechanism 108 has a self-locking function, and the user only needs to release the hand to fix the second body 105 at a certain angle (when the pawl 114 is in the first state), and the user does not need to operate a button, a knob, a locking pin or other parts to unlock or lock the second body 105. The angle adjusting mechanism 108 has simple structure and high operation convenience.

[0048] As shown in Figure 4 , the angle adjusting mechanism 108 further includes an elastic member 110, and two ends of the elastic member 110 are connected with the second body 105 and the limiting part 115 respectively. More specifically, one end of the elastic member 110 can be connected with the second body 105 through the screw 109, and the other end of the elastic member 110 can be in abutment with the limiting part 115. When the pawl 114 is in the first state, the elastic force of the elastic member 110 is used to keep the limiting part 115 in the first slot area 129, so that the pawl 114 is kept in the first state, and it is ensured that the second body 105 can rotate in the first direction and the angle of the second body 105 can be fixed. When the pawl 114 is in the second state, the elastic force of the elastic member 110 is used to keep the limiting part 115 in the second slot area 130, so that the pawl 114 is kept in the second state, so as to avoid the pawl 114 and the ratchet wheel 113 from contacting and hindering the second body 105 from rotating in the second direction.

[0049] In some embodiments, the elastic member 110 is a spring, and the spring is arranged in a bent manner, and one side surface of the spring is in abutment with the limiting part 115, so as to form the elastic force applied to the limiting part 115.

[0050] In some embodiments, as shown in Figure 5(a) shown, the pawl 114 further comprises a driving hole 120, the driving hole 120 and the pawl tooth part 125 are respectively located at two ends of the pawl 114. The limiting piece 115 is movably arranged in the driving hole 120, two ends of the limiting piece 115 are respectively located in two limiting grooves 116, a hole wall of the driving hole 120 is used to contact the limiting piece 115 and push the limiting piece 115 to move in the limiting groove 116, so that the limiting piece 115 is transferred between the first groove area 129 and the second groove area 130.

[0051] Specifically, as Figure 5 (b) shown, the driving hole 120 is triangular, which is beneficial to reduce the shape complexity of the driving hole 120 and reduce the processing difficulty and processing cost of the pawl 114. The inner wall surface of the driving hole 120 comprises a first wall surface 126, a second wall surface 127 and a third wall surface 128, when the pawl 114 is in the first state, the first wall surface 126 is in abutment with the limiting piece 115 and is sequentially distributed in the first direction. The second wall surface 127 is connected with the first wall surface 126, and the second wall surface 127 is located on the side of the limiting piece 115 away from the ratchet wheel 113. The third wall surface 128 is connected with the first wall surface 126 and the second wall surface 127 at two ends respectively, the third wall surface 128 is inclined, and the two ends of the third wall surface 128 are arranged in the circumferential direction of the ratchet wheel 113 and in the radial direction of the ratchet wheel 113.

[0052] In some embodiments, the limiting groove 116 can be bent, along the radial direction of the pawl 114, the first groove area 129 and the second groove area 130 are staggered; along the circumferential direction of the pawl 114, the first groove area 129 and the second groove area 130 are at least partially staggered. In this way, the first groove area 129 and the second groove area 130 are staggered, which reduces the risk that the limiting piece 115 accidentally leaves a certain groove area and enters another groove area due to vibration. The second groove area 130 is located on one side of the first groove area 129, the second groove area 130 is in communication with the top end of the first groove area 129, and the second groove area 130 protrudes towards the ratchet wheel 113 relative to the first groove area 129. In this way, it is beneficial to reduce the shape complexity of the limiting groove 116, thereby reducing the processing difficulty and cost of the second main body 105.

[0053] In the process of rotating the angle adjusting mechanism 108 from Figure 5 (a) to the state shown in Figure 5 (c), the position change of the limiting piece 115 is as shown in Figure 6 (a) to Figure 6 (c). In the process of rotating the angle adjusting mechanism 108 from Figure 7 (a) to the state shown in Figure 7 (c), the position change of the limiting piece 115 is as shown in Figure 8 (a) to Figure 8 (c). It should be noted that Figure 5(a) the state shown is the same as Figure 7 (c) the state shown is the same as Figure 6 (a) the state shown is the same as Figure 8 (c) the state shown is the same as

[0054] As Figure 5 (a) shown, the contact point of the elastic sheet and the limiting member 115 is located at the right upper side of the limiting member 115 approximately, the elastic sheet makes the limiting member 115 have the tendency of moving leftward and downward, thereby keeping the limiting member 115 in the first groove area 129. Please refer to Figure 5 (b) and Figure 6 (b), as the second body 105 rotates along the first direction, when the claw tooth part 125 is pushed open by the ratchet part 123 for a certain distance, the pawl 114 slightly rotates counterclockwise around the second pin shaft 112, the first wall surface 126 pushes the limiting member 115 to move upward in the first groove area 129, but the limiting member 115 is still not completely separated from the first groove area 129. Please refer to Figure 5 (c) and Figure 6 (c), as the second body 105 continues to rotate along the first direction, the elastic member 110 drives the limiting member 115 to reset to the bottom end of the first groove area 129, the limiting member 115 pushes the first wall surface 126, the pawl 114 rotates clockwise around the second pin shaft 112, thereby making the claw tooth part 125 clamped into another tooth groove.

[0055] In the process of rotating the second body 105 along the first direction to the state shown in Figure 7 (a), the separating part 122 abuts against the pawl 114, the pawl 114 rotates counterclockwise around the second pin shaft 112, and the pawl 114 is switched to the second state. In this process, the first wall surface 126 pushes the limiting member 115 to move along the circumference of the ratchet wheel 113, and when the limiting member 115 moves to the top end of the first groove area 129, the elastic member 110 pushes the limiting member 115 to move along the radial direction of the ratchet wheel 113, thereby pushing the limiting member 115 into the second groove area 130.

[0056] In the process of rotating the second body 105 along the second direction to the state shown in Figure 7 (c), the resetting part 124 abuts against the pawl 114 first, the pawl 114 rotates clockwise around the second pin shaft 112, and the pawl 114 is switched to the first state. As Figure 8 shown, in this process, the third wall surface 128 pushes the limiting member 115 to move rightward and enter the top end of the first groove area 129, then the elastic member 110 pushes the limiting member 115 to move downward, thereby pushing the limiting member 115 into the bottom end of the first groove area 129, and finally the elastic member 110 keeps the limiting member 115 at the bottom end of the first groove area 129.

[0057] In the above-described embodiments, the first support 102 and the second support 103 of the armrest 101 are connected by the angle adjustment mechanism 108. In other embodiments not shown, the angle adjustment mechanism 108 described above can also be applied to other parts of the armrest 101 or other parts of the chair. As long as the parts in the seat that need to achieve a rotating connection and need to achieve angle adjustment can adopt the angle adjustment mechanism 108 of the present application.

[0058] For example, the bottom end of the column 107 of the armrest 101 is connected with the bottom plate of the seat, the top end of the column 107 of the armrest 101 is connected with the rear end of the connecting arm 106 through the angle adjustment mechanism 108, the column 107 is connected with the first main body 104, and the connecting arm 106 is connected with the second main body 105. For another example, the front end of the connecting arm 106 and the first support 102 are connected through the angle adjustment mechanism 108. In addition, the angle adjustment mechanism 108 can also be used for angle adjustment of the backrest, neck pillow and other parts of the seat, which will not be listed one by one.

[0059] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. An angle adjustment mechanism, characterized by The angle adjusting mechanism comprises: a first body; a second body, which is rotationally connected with the first body, and comprises a limiting groove, the limiting groove comprising a first groove area and a second groove area; a ratchet wheel, which is fixedly connected with the first body, and comprises a separation part, a reset part and a plurality of ratchet teeth, the reset part, the ratchet teeth and the separation part being sequentially distributed along a first direction; a pawl, which is rotationally connected with the second body, and comprises a pawl tooth part; a limiting piece, a part of which is movably arranged in the limiting groove, and which is movably connected with the pawl; when the pawl is in a first state, the limiting piece is located in the first groove area, the ratchet teeth are engaged with the pawl tooth part, the second body can rotate relative to the first body along the first direction, and the ratchet teeth and the pawl tooth part can hinder the second body from rotating relative to the first body along a second direction; when the pawl is in a second state, the limiting piece is located in the second groove area, the ratchet teeth and the pawl tooth part are separated from each other, and the second body can rotate relative to the first body along the second direction, the second direction being opposite to the first direction; in the process of rotating the pawl along the first direction, the separation part can abut against the pawl to make the pawl tooth part rotate in a direction away from the ratchet teeth, and make the limiting piece move from the first groove area to the second groove area, thereby switching the pawl from the first state to the second state; in the process of rotating the pawl along the second direction, the reset part can abut against the pawl to make the pawl tooth part rotate in a direction close to the ratchet teeth, and make the limiting piece move from the second groove area to the first groove area, thereby switching the pawl from the first state to the second state.

2. The angular adjustment mechanism of claim 1, wherein The angle adjusting mechanism further comprises a resilient piece, two ends of the resilient piece being respectively connected with the second body and the limiting piece; when the pawl is in the first state, the elastic force of the resilient piece is used to keep the limiting piece in the first groove area; and when the pawl is in the second state, the elastic force of the resilient piece is used to keep the limiting piece in the second groove area.

3. The angular adjustment mechanism of claim 2, wherein, The resilient piece is a spring, and the spring is arranged in a bent manner, one side surface of the spring abutting against the limiting piece.

4. The angular adjustment mechanism of claim 2, wherein, The pawl further comprises a driving hole, the driving hole and the pawl tooth part being respectively located at two ends of the pawl, the limiting piece movably penetrating the driving hole, two ends of the limiting piece being respectively located in two limiting grooves, and a hole wall of the driving hole being used to contact the limiting piece and push the limiting piece to move in the limiting groove.

5. The angular adjustment mechanism of claim 4, wherein, The hole wall of the driving hole comprises: a first wall surface, the first wall surface abutting against the limiting piece and sequentially distributed along the first direction when the pawl is in the first state; a second wall surface, the second wall surface being connected with the first wall surface, and the second wall surface being located on a side of the limiting piece away from the ratchet wheel. A third wall surface, two ends of the third wall surface are connected with the first wall surface and the second wall surface respectively, the third wall surface is arranged obliquely, two ends of the third wall surface are arranged both along the circumferential direction of the ratchet wheel and along the radial direction of the ratchet wheel; During the process that the second main body rotates along the first direction until the separation part abuts against the pawl, the first wall surface and the elastic member push the limiting member to move, so that the limiting member is transferred from the first groove area to the second groove area; During the process that the second main body rotates along the second direction until the reset part abuts against the pawl, the third wall surface pushes the limiting member to move, so that the limiting member is transferred from the second groove area to the first groove area.

6. The angular adjustment mechanism of claim 1, wherein, The limiting groove is arranged in a bent manner, along the radial direction of the pawl, the first groove area and the second groove area are staggered; along the circumferential direction of the pawl, the first groove area and the second groove area are at least partially staggered.

7. The angular adjustment mechanism of claim 6, wherein, The second groove area is located on one side of the first groove area, and the second groove area protrudes towards the ratchet wheel relative to the first groove area.

8. A seat, characterized by An angle adjusting mechanism as claimed in any one of claims 1 to 7.

9. The seat of claim 8, wherein, The seat comprises an armrest, the armrest comprises a first support and a second support, the first support is connected with the first main body, and the second support is connected with the second main body.

10. The seat of claim 9, wherein, The first support is located in front of the second support, and the rear end of the second support can rotate upward and downward relative to the first support.

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