Height adjusting mechanism of seat armrest, seat armrest and seat

Abstract

The utility model discloses a height adjusting mechanism of a seat armrest, the seat armrest and a seat. The height adjusting mechanism of the seat armrest comprises a first connecting arm, a second connecting arm, a locking block and an elastic piece, a guide groove is formed in the second connecting arm, the guide groove comprises a first side wall and a second side wall, a plurality of clamping grooves are formed in the first side wall, and two shifting parts are arranged on the second side wall; a sliding block is fixedly arranged on the first connecting arm and is limited between the first side wall and the second side wall; the lock block comprises a rotating part, a lock head and a shifting end; a matching part and a stopping part are arranged on the sliding block, and the matching part is matched with the rotating part so that the locking block can swing left and right relative to the sliding block and can move up and down between a first position and a second position relative to the sliding block; the elastic element is used for providing elastic stress for pushing the locking block towards the first side wall. According to the utility model, the height adjustment of the handrail becomes simple and convenient, and the height adjustment of the handrail can be easily realized without using large force.

Description

Technical Field

[0001] The utility model relates to the technical field of seats, and in particular to a height adjustment mechanism for a seat armrest, a seat armrest and a seat. Background Art

[0002] Traditional seat armrests are fixed on the sides of the seats and do not have the function of adjusting the height up and down. The seat armrests with a fixed height position can only provide support for the user's arms in a fixed state, which is difficult to meet the user's personalized requirements.

[0003] In order to meet the comfort requirements, some existing office chairs and gaming chairs are provided with an armrest that can be adjusted up and down. Specifically, the support arm used to support the armrest is provided with a retractable structure. When the armrest is lifted upward, the support arm is elongated, and two movable parts of the support arm are locked by a locking block. The locking block is controlled by a switch outside the armrest or the support arm. Each time adjustment is made, the switch needs to be pressed to disengage the locking block from a movable part of the support arm. Only then can the armrest be lifted up or pressed down to change the height of the armrest. When operating, the user often needs to press the switch with one hand and lift or press the armrest with the other hand, which makes it extremely inconvenient to adjust the height of the armrest. Utility Model Content

[0004] The utility model aims to provide a seat armrest height adjustment mechanism, a seat armrest and a seat, which can realize the height adjustment of the armrest by single-hand operation, thereby making the adjustment of the armrest simple and convenient.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A height adjustment mechanism for a seat armrest, comprising a first connecting arm connected to the seat, a second connecting arm connected to the armrest, a locking block and an elastic member;

[0007] The second connecting arm is provided with a guide groove extending in the height direction, the guide groove includes a first side wall and a second side wall opposite to the first side wall, the first side wall is provided with a plurality of clamping grooves arranged in the length direction of the guide groove, and the second side wall is provided with two toggle parts, and the two toggle parts are staggered by a certain distance in the length direction of the guide groove;

[0008] A slider is fixedly provided on the first connecting arm, and the slider is limited between the first side wall and the second side wall so that the slider can slide in the length direction of the guide groove; the locking block includes a rotating part, a locking head located on one side of the rotating part, and a toggle end located on the other side of the rotating part; a matching part and a stopper are provided on the slider, and the matching part cooperates with the rotating part so that the locking block can swing left and right relative to the slider and can move up and down relative to the slider between a first position and a second position;

[0009] When the second connecting arm moves downward to a predetermined position, the toggle portion located at the bottom toggles the toggle end upward to move the lock block from the first position to the second position, and when the lock block is in the second position, the stopper portion blocks the side of the lock block facing the first side wall to prevent the lock block from swinging toward the first side wall; when the second connecting arm moves upward to a predetermined position, the toggle portion located at the top toggles the toggle end downward to move the lock block from the second position to the first position, and when the lock block is in the first position, the lock block is disengaged from the stopper portion so that the lock block has the freedom to swing left and right relative to the slider;

[0010] The elastic element is used to provide an elastic stress for pushing the lock block toward the first side wall, so that the lock head is embedded in one of the slots when the freedom of the lock block to swing left and right is not limited.

[0011] Preferably, the mating portion is a slide groove arranged on the slider and extending in the height direction, the rotating portion is a rotating shaft arranged on the locking block and embedded in the slide groove, and the cross-sectional shape of the rotating shaft is configured to enable the rotating shaft to rotate in the slide groove and slide inside the slide groove along the extension direction of the slide groove.

[0012] Preferably, a recess is provided on the slider, a slide groove is provided on the bottom surface of the recess, the stop portion is a retaining wall provided on the top wall of the recess and extending downward, a portion of the retaining wall in the recess located close to the second side wall forms a receiving space, and when the locking block is in the second position, the toggle end of the locking block is located in the receiving space.

[0013] Preferably, a connecting wall is provided on the top wall of the recess and extends from the bottom of the retaining wall to the side of the slider close to the first side wall. The connecting wall is gradually inclined upward from one end connected to the retaining wall toward the other end to avoid the lock block swinging left and right. The part where the connecting wall is connected to the retaining wall forms a stop end, which is used to be pressed above the toggle end when the lock head is embedded in the slot.

[0014] Preferably, the portion of the lock block located between the lock head and the toggle end forms a notch for the stop end to be embedded in, and the side of the notch facing away from the lock head forms a stop surface. When the stop end is embedded in the notch, the stop wall abuts against the stop surface to prevent the lock block from swinging toward the first side wall.

[0015] Preferably, a first limiting groove is provided on the side wall of the recess, and a second limiting groove opposite to the first limiting groove is provided on the side of the locking block away from the first side wall; the elastic member is a spring, and both ends of the spring are respectively embedded in the first limiting groove and the second limiting groove.

[0016] Preferably, a groove is provided on the second side wall, which is recessed away from the first side wall, and the top and bottom surfaces of the groove respectively form two toggle parts; a toggle rod is provided on the lock block, which extends in a direction away from the lock head, and an end of the toggle rod away from the lock head forms a toggle end that can slide up and down in the groove.

[0017] Preferably, the slot includes a support wall extending from the first side wall toward a direction away from the second side wall, and a guide wall extending from the first side wall toward a direction away from the second side wall, the support wall is arranged perpendicular to the up and down direction, or the support wall gradually tilts upward from an end connected to the first side wall toward an end away from the second side wall, the guide wall is located below the support wall, and the guide wall gradually tilts upward from an end connected to the first side wall toward an end away from the second side wall so that the guide wall can push the lock head toward the second side wall when the lock head moves downward relative to the slot inside the slot.

[0018] Preferably, the first connecting arm includes two connecting plates that are arranged opposite to each other and installed together, and the slider is located between the two connecting plates and is integrally formed on one of the connecting plates; the outer parts of the two connecting plates are provided with an inner sleeve fixed to the two connecting plates, and the second connecting arm is fixedly connected with an outer sleeve that is provided on the outside of the inner sleeve and slides with the inner sleeve.

[0019] A seat armrest comprises the above-mentioned height adjustment mechanism of the seat armrest.

[0020] A seat, including the above-mentioned seat armrests.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] The utility model locks the first connecting arm and the second connecting arm through the locking block. When adjusting the seat armrest, there is no need to press a button to control the state of the locking block. Therefore, the user can adjust the height of the armrest to a required state as needed through single-handed operation, making the height adjustment of the armrest simple and convenient, and the height adjustment of the armrest can be easily achieved without using great force.

[0023] In addition, since the locking block can achieve a better supporting effect between the second connecting arm and the first connecting arm, the downward pressure of the armrest can be transmitted to the seat via the locking block and the first connecting arm, so that the armrest can withstand a larger downward pressure value and prevent the armrest from moving downward during normal use, thereby providing better support for the user's arm. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the installation of the utility model;

[0025] Figure 2 1 is a schematic structural diagram of the second connecting arm;

[0026] Figure 3 for Figure 1 A schematic structural diagram of the first connecting arm;

[0027] Figure 4 for Figure 1 Structural diagram of the middle locking block;

[0028] Figure 5 It is a schematic diagram of the structure of the utility model;

[0029] Figure 6-9 It is a schematic diagram of the use state of the utility model. DETAILED DESCRIPTION

[0030] Below, in conjunction with the accompanying drawings and specific implementation methods, the utility model is further described. It should be noted that, under the premise of no conflict, the various embodiments described below or the various technical features can be arbitrarily combined to form a new embodiment. Except for special instructions, the materials and equipment used in this embodiment can be purchased from the market. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0031] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In the description of the present application, "plurality" means two or more, unless otherwise precisely and specifically specified.

[0032] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be connected through an intermediary medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] like Figure 1 , 2 , 3, 4, and 5 show a height adjustment mechanism for a seat armrest of the utility model, which includes a first connecting arm, a second connecting arm 20, a locking block 40, and a spring 50. The second connecting arm 20 and the first connecting arm form a telescopic mechanism. The armrest is mounted on the second connecting arm 20, and the first connecting arm is connected to the seat. The second connecting arm 20 moves up and down relative to the first connecting arm to adjust the height of the armrest. The locking block 40 cooperates with the spring 50 to lock the second connecting arm 20 and the first connecting arm to keep the armrest in the adjusted position.

[0034] Specifically, a guide groove 21 extending along the height direction can be provided on the second connecting arm 20, and the guide groove 21 includes a first side wall 211 and a second side wall 212 opposite to the first side wall 211. A plurality of card grooves 213 arranged along the length direction of the guide groove 21 are provided on the first side wall 211, and two toggle parts are provided on the second side wall 212, and the two toggle parts are staggered a certain distance along the length direction of the guide groove 21; a slider 30 is fixedly provided on the first connecting arm, and the slider 30 is limited between the first side wall 211 and the second side wall 212, and can slide along the length direction of the guide groove 21. The second connecting arm 20 and the first connecting arm form the above-mentioned telescopic mechanism through the cooperation of the slider 30 and the guide groove 21.

[0035] The locking block 40 is installed on the slider 30, and includes a rotating part, a locking head 41, and a toggle end 43, wherein the locking head 41 is located on a side of the locking block 40 close to the first side wall 211, and the toggle end 43 is located on a side of the locking block 40 close to the second side wall 212, the locking head 41 and the toggle end 43 are respectively located on both sides of the rotating part, and the locking head 41 is used to engage with the card slot 213 provided on the first side wall 211; the slider 30 is provided with a matching part and a stopper part, the matching part cooperates with the rotating part so that the locking block 40 is installed on the slider 30, and the matching part and the rotating part are configured to enable the rotating part to rotate relative to the matching part, and enable the rotating part to move relative to the slider 30 in the up and down direction, so that the locking block 40 can swing left and right relative to the slider 30, and enable the locking block 40 to move up and down between a first position and a second position relative to the slider 30.

[0036] In a specific embodiment, the matching portion is a slide groove 31 provided on the slider 30, and the slide groove 31 extends along the height direction. The rotating portion is a rotating shaft 42 provided on the locking block 40, and the rotating shaft 42 is embedded in the slide groove 31, so that the rotating shaft 42 can slide along the slide groove 31 and rotate in the slide groove 31 at the same time; in order to enable the rotating shaft 42 to both slide and rotate in the slide groove 31, in the utility model, the cross-section of the rotating shaft 42 is set to be circular; of course, in other embodiments, the cross-section of the rotating shaft 42 may also be other shapes, as long as the requirements that the rotating shaft 42 can be rotatable and slidable in the slide groove 31 are met.

[0037] When the rotating shaft 42 is located at the lower end of the slide groove 31, the locking block 40 is in the above-mentioned first position, and when the rotating shaft 42 is located at the upper end of the slide groove 31, the locking block 40 is in the above-mentioned second position; the stopper on the slider 30 is used to block the locking block 40 when the locking block 40 is in a specific position to limit the freedom of the locking block 40 to swing toward the first side wall 211. In this state, the lock head 41 on the locking block 40 will not be stuck in the slot 213.

[0038] Specifically, when the second connecting arm 20 moves downward to a predetermined position, the toggle portion located at the bottom contacts the toggle end 43 and is able to toggle the toggle end 43 upward, thereby causing the locking block 40 to move upward from the above-mentioned first position relative to the slider 30 to the second position. When the locking block 40 moves upward to the second position, the stop portion blocks the side of the locking block 40 toward the first side wall 211, thereby allowing the stop portion to block the freedom of the locking block 40 to swing toward the first side wall 211; when the second connecting arm 20 moves upward to a predetermined position, the toggle portion located at the top contacts the toggle end 43 and is able to toggle the toggle end 43 downward, thereby causing the locking block 40 to move downward from the second position relative to the slider 30 to the first position. When the locking block 40 moves downward to the first position, the locking block 40 disengages from the stop portion. At this time, the freedom of the locking block 40 to swing toward the first side wall 211 is released, and the locking block 40 can swing left and right.

[0039] The spring 50 is used to provide an elastic stress to push the locking block 40 toward the first side wall 211. If the freedom of the locking block 40 to swing left and right is not limited by the stop portion or the first side wall 211, the locking block 40 will swing toward the first side wall 211 under the push of the spring 50, so that the locking head 41 on the locking block 40 can be inserted into one of the slots 213. The second connecting arm 20 is locked with the first connecting arm through the cooperation between the locking head 41 and the slot 213.

[0040] Figure 5 , 6 , 7, 8, and 9 collectively show the adjustment process of the height adjustment mechanism of the seat armrest of the utility model. Figure 5 In the state shown, the locking block 40 is pressed toward the first side wall 211 by the elastic stress provided by the spring 50, so that the locking head 41 on the locking block 40 is locked in one of the slots 213. At this time, the locking block 40 is in the first position, and the locking head 41 cooperates with the slot 213 to limit the freedom of the second connecting arm 20 to move downward relative to the slider 30.

[0041] exist Figure 5 In the embodiment, the lock head 41 is stuck in the slot 213 at a higher position, so that the second connecting arm 20 is in a lower position, that is, the height of the handrail connected to the second connecting arm 20 is lower. When the handrail needs to be raised, the handrail is pulled upward. At this time, the lock head 41 is squeezed out of the slot 213 through the internal structure of the slot 213, and the second connecting arm 20 moves upward to a predetermined height. When the armrest is at the required height, the armrest is stopped from being pushed, and the lock head 41 on the lock block 40 is re-slotted into the lower slot 213 through the elastic stress of the spring 50.

[0042] like Figure 6 As shown, after the lock head 41 is inserted into the slot 213, the lock block 40 is again in a state of limiting the freedom of the second connecting arm 20 to move downward relative to the slider 30. Figure 5 , 6 In the state shown, since the locking block 40 is mounted on the slider 30, and the locking head 41 on the locking block 40 is clamped in the clamping groove 213, the locking block 40 locks the slider 30 and the second connecting arm 20 between them. When the armrest is subjected to downward pressure, the locking block 40 can transfer the downward pressure from the second connecting arm 20 to the slider 30, and the downward pressure is transferred to the seat through the first connecting arm, so that the locking block 40 can stably support the second connecting arm 20 to prevent the second connecting arm 20 from moving downward abnormally when subjected to greater pressure. That is to say, Figure 5 , 6 In the state shown, the armrest can only be lifted upward to move the second connecting arm 20 upward relative to the first connecting arm. The second connecting arm 20 is supported by the locking block 40 and will not move downward relative to the first connecting arm.

[0043] exist Figure 6 In the state shown, if you need to adjust the height of the armrest downward, Figure 7 As shown, the armrest is lifted upward, and the second connecting arm 20 moves upward to the highest position. At this time, the locking block 40 moves downward with the slider 30 relative to the second connecting arm 20, and the locking head 41 on the locking block 40 abuts against the first side wall 211. The toggle portion located below pushes the toggle end 43 upward, so that the locking block 40 moves upward from the first position to the second position. The locking block 40 is limited by the stop portion on the slider 30, so that the locking block 40 cannot swing toward the first side wall 211. At this time, the locking block 40 no longer limits the freedom of the second connecting arm 20 to move downward relative to the first connecting arm.

[0044] Then as Figure 8 As shown, the armrest is moved downward to the limit position. At this time, the second connecting arm 20 is moved downward to the limit position, and the toggle portion located at the upper part of the second side wall 212 pushes the toggle end 43 of the lock block 40 downward, so that the lock block 40 moves downward from the second position to the first position. At this time, the lock block 40 is disengaged from the stop portion on the slider 30, and the freedom of the lock block 40 to swing left and right is no longer restricted. The lock block 40 is pushed toward the first side wall 211 by the elastic stress of the spring 50, as shown in FIG. Fig. 9 As shown, the lock head 41 of the lock block 40 is inserted into the slot 213 at the highest point. Fig. 9 In the state shown, if the armrest needs to be raised, the armrest only needs to be pulled upward a predetermined distance so that the lock head 41 of the lock block 40 is inserted into the slot 213 of the corresponding height, and the height position of the armrest can be adjusted.

[0045] In the utility model, the first connecting arm and the second connecting arm 20 are locked by the locking block 40. When adjusting the armrest of the seat, there is no need to press a button to control the state of the locking block 40. Therefore, the user can adjust the height of the armrest to the required state as needed by single-handed operation, making the height adjustment of the armrest simple and convenient, and the height adjustment of the armrest can be easily achieved without using a large force. In addition, since the locking block 40 can achieve a better support effect between the second connecting arm 20 and the first connecting arm, the downward pressure of the armrest can be transmitted to the seat via the locking block 40 and the first connecting arm, so that the armrest can withstand a large downward pressure value, preventing the armrest from moving downward during normal use, thereby providing better support for the user's arm.

[0046] The utility model provides a matching portion on the slider 30, and a rotating portion on the locking block 40. The matching portion and the rotating portion cooperate with each other so that the locking block 40 can swing left and right and move up and down relative to the slider 30. In the above embodiment, the matching portion is set to a slide groove 31 located on the slider 30, and the rotating portion is set to a rotating shaft 42 located on the locking block 40 to achieve the purpose of enabling the locking block 40 to swing left and right and move up and down. In fact, in other embodiments, achieving the above purpose is not limited to adopting the above structure. For example, the slide groove 31 can be set on the locking block 40, and the rotating shaft 42 can be correspondingly set on the slider 30.

[0047] In order to make the entire mechanism more compact, the utility model forms a recessed position 301 on the side of the slider 30, and places the locking block 40 in the recessed position 301, so that the locking block 40 occupies as little radial space of the first connecting arm as possible. The above-mentioned slide groove 31 is arranged on the bottom surface of the recessed position 301, and the stopper is a retaining wall 32 extending downwardly from the top wall of the recessed position 301. A receiving space is formed in the recessed position 301 on the side of the retaining wall 32 facing the second side wall 212. When the locking block 40 is in the second position, the locking block 40 is limited by the retaining wall 32 and cannot swing toward the first side wall 211. The driving end 43 of the locking block 40 is located in the receiving space. A connecting wall 33 is also provided on the top wall of the recess 301. The connecting wall 33 extends from the bottom wall of the retaining wall 32 to the side of the slider 30 close to the first side wall 211. The connecting wall 33 is inclined. Specifically, the connecting wall 33 gradually inclines upward from one end connected to the retaining wall 32 to the other end. By setting the connecting wall 33 as an inclined structure, the connecting wall 33 can avoid the locking block 40 swinging left and right.

[0048] For example, in Figures 8 to 9In the state, the locking block 40 is pushed downward to disengage from the retaining wall 32, and under the elastic stress of the spring 50, the locking block 40 swings toward the first side wall 211. The inclined connecting wall 33 can avoid interference between the slider 30 and the locking block 40, thereby ensuring that the locking block 40 can swing normally and flexibly toward the first side wall 211, so that the locking head 41 on the locking block 40 can be inserted into the slot 213.

[0049] In addition, the portion where the connecting wall 33 and the retaining wall 32 meet forms a stop end 34. Fig. 9 In the state shown, the lock head 41 is stuck in the slot 213, and the stop end 34 is just pressed on the toggle end 43 that has completed swinging toward the first side wall 211. At this time, the lower part of the lock block 40 is limited by the rotation shaft 42 and the lower end of the slide slot 31, and the upper part of the lock block 40 is limited by the stop end 34 and the toggle end 43 to prevent the lock block 40 from moving up and down. Under the elastic stress of the spring 50, the lock block 40 will not swing left and right, and the lock head 41 of the lock block 40 is stably stuck in the slot 213, so that the lock block 40 can stably lock the freedom of the second connecting arm 20 to move downward relative to the first connecting arm, further preventing the armrest from moving downward abnormally during use.

[0050] In order to match the structure of the concave position 301, a notch 44 is formed in the portion of the lock block 40 between the lock head 41 and the toggle end 43. The notch 44 forms a stop surface on the side away from the lock head 41. The notch 44 is used for the above-mentioned stop end 34 to be embedded. Figure 7 In the state shown, the stop end 34 is embedded in the notch 44, and the retaining wall 32 is in contact with the retaining surface. The retaining wall 32 cooperates with the retaining surface to form a limiting structure that prevents the locking block 40 from swinging toward the first side wall 211.

[0051] A first limiting groove 35 is also provided on the side wall of the above-mentioned recess 301. Corresponding to the first limiting groove 35, a second limiting groove 45 is provided on the side of the locking block 40 away from the first side wall 211. The second limiting groove 45 is arranged opposite to the first limiting groove 35. One end of the spring 50 is embedded in the first limiting groove 35 and the other end is embedded in the second limiting groove 45. In this way, when the locking block 40 moves between the first position and the second position, the end of the spring 50 is prevented from being separated from the slider 30 and the locking block 40, so that the spring 50 can provide stable elastic stress for the locking block 40.

[0052] In other embodiments, the spring 50 may be replaced by other elastic members, such as an elastic rubber block, or a tension spring connected between the locking block 40 and the slider 30 for always pulling the locking block 40 toward the first side wall 211; in other embodiments, the spring may be a torsion spring, for example, a movable block may be embedded in the slide groove 31, and the rotating shaft 42 of the locking block 40 may be rotatably connected to the movable block, and the torsion spring may be arranged between the movable block and the locking block 40. In this way, the locking block 40 can swing left and right, and can move up and down relative to the slider 30, and the elastic stress provided by the torsion spring can always make the locking block 40 have a tendency to swing toward the first side wall 211.

[0053] A groove 22 is provided on the second side wall 212, which is recessed away from the first side wall 211. The top surface of the groove 22 forms a toggle portion 214, and the bottom surface forms a toggle portion 215. A toggle rod 46 is provided on the lock block 40, which extends away from the lock head 41. The end of the toggle rod 46 away from the lock head 41 forms a toggle end 43. Figure 7 As shown, when the freedom of the locking block 40 to swing toward the first side wall 211 is limited by the retaining wall 32, the locking block 40 is in a state close to the second side wall 212, and the part of the lever 46 on the locking block 40 away from the lock head 41 is embedded in the groove 22, so that the toggle end 43 on the lever 46 can slide in the groove 22 with the locking block 40, and when the lever 46 slides upward to the preset position, the toggle portion 214 can push the lever 46 downward, and when the lever 46 slides downward to the preset position, the toggle portion 215 pushes the lever 46 upward.

[0054] In order to stably lock the lock head 41 in the slot 213, the lock head 41 can lift the second connecting arm 20 upward when it is locked in the slot 213, the slot 213 of the utility model includes a support wall 2131 and a guide wall 2132, the support wall 2131 extends from the first side wall 211 to the direction away from the second side wall 212, and the support wall 2131 is set to be perpendicular to the up and down direction, the guide wall 2132 is located below the support wall 2131, and the guide wall 2132 extends from one end connected to the first side wall 211 to the direction away from the second side wall 212. One end of the second side wall 212 gradually tilts upward, and when the lock head 41 is inserted into the slot 213, the lock head 41 presses against the bottom of the support wall 2131. Since the support wall 2131 is perpendicular to the up and down directions, the force of the lock head 41 and the support wall 2131 pressing against each other is consistent with the up and down directions, thereby preventing the lock head 41 from detaching from the slot 213, especially when the armrest is subjected to downward pressure, avoiding the lock head 41 from detaching from the slot 213, so that the lock head 41 can cooperate well with the slot 213 to realize locking the second connecting arm 20 to move freely downward.

[0055] When the height of the armrest needs to be adjusted, the armrest is lifted upward, the second connecting arm 20 moves upward, the lock head 41 is squeezed by the guide wall 2132, and the inclined guide wall 2132 can gradually push the lock head 41 toward the second side wall 212, and finally the lock head 41 is disengaged from the slot 213; when the lock head 41 is located in the lowermost slot 213, the second connecting arm 20 moves upward, so that the lock head 41 is disengaged from the lowermost slot 213, and the lock head 41 is pressed against the first side wall 211, that is, Figure 7 In the state shown, the second connecting arm 20 continues to move upward, so that the toggle portion 215 pushes the toggle rod 46 upward, and the locking block 40 moves to the second position.

[0056] In another embodiment, the support wall 2131 may be configured as an inclined structure so that the support wall 2131 gradually tilts upward from an end connected to the first side wall 211 toward an end away from the second side wall 212. When the lock head 41 abuts against the bottom of the support wall 2131, the inclined support wall 2131 can prevent the lock head 41 from moving toward the second side wall 212, thereby preventing the lock head 41 from detaching from the slot 213.

[0057] See also Figure 1 As shown, the first connecting arm of the utility model may include a connecting plate 10 and a connecting plate 60, and the connecting plate 10 and the connecting plate 60 are fixed together in an assemblable manner, for example, the two may be fixed by bolt connection or clamping. After the connecting plate 10 and the connecting plate 60 are fixed, the first connecting arm forms an inner cavity for accommodating the second connecting arm 20, and the slider 30 is located between the connecting plate 10 and the connecting plate 60, and the slider 30 is fixed on the connecting plate 10 or the connecting plate 60. For example, the slider 30 may be integrally formed on the connecting plate 10, and an inner sleeve 70 fixed to the connecting plate 10 and the connecting plate 60 is provided on the outside of the connecting plate 10 and the connecting plate 60, and an outer sleeve 80 is fixedly connected to the second connecting arm 20, and the outer sleeve 80 is sleeved on the inner sleeve 70 and slidably cooperates with the inner sleeve 70.

[0058] The seat armrest of the utility model includes the height adjustment mechanism of the seat armrest, and the seat of the utility model includes the height adjustment mechanism of the seat armrest and the seat armrest. Other structures of the seat and the seat armrest are the same as those in the prior art and will not be described in detail here.

[0059] Finally, it should be noted that the above-mentioned implementation modes are only optional embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. The height adjustment mechanism of the seat armrest is characterized by: It includes a first connecting arm connected to the seat, a second connecting arm connected to the armrest, a locking block and an elastic member; The second connecting arm is provided with a guide groove extending in the height direction, the guide groove includes a first side wall and a second side wall opposite to the first side wall, the first side wall is provided with a plurality of clamping grooves arranged in the length direction of the guide groove, and the second side wall is provided with two toggle parts, and the two toggle parts are staggered by a certain distance in the length direction of the guide groove; A slider is fixedly provided on the first connecting arm, and the slider is limited between the first side wall and the second side wall so that the slider can slide in the length direction of the guide groove; the locking block includes a rotating part, a locking head located on one side of the rotating part, and a toggle end located on the other side of the rotating part; a matching part and a stopper are provided on the slider, and the matching part cooperates with the rotating part so that the locking block can swing left and right relative to the slider and can move up and down relative to the slider between a first position and a second position; When the second connecting arm moves downward to a predetermined position, the toggle portion located at the bottom toggles the toggle end upward to move the lock block from the first position to the second position, and when the lock block is in the second position, the stopper portion blocks the side of the lock block facing the first side wall to prevent the lock block from swinging toward the first side wall; when the second connecting arm moves upward to a predetermined position, the toggle portion located at the top toggles the toggle end downward to move the lock block from the second position to the first position, and when the lock block is in the first position, the lock block is disengaged from the stopper portion so that the lock block has the freedom to swing left and right relative to the slider; The elastic element is used to provide an elastic stress for pushing the lock block toward the first side wall, so that the lock head is embedded in one of the slots when the freedom of the lock block to swing left and right is not limited.

2. The height adjustment mechanism of the seat armrest according to claim 1, characterized in that: The matching part is a slide groove arranged on the slider and extending in the height direction, the rotating part is a rotating shaft arranged on the locking block and embedded in the slide groove, and the cross-sectional shape of the rotating shaft is configured to enable the rotating shaft to rotate in the slide groove and slide inside the slide groove along the extension direction of the slide groove.

3. The height adjustment mechanism of the chair armrest according to claim 2, characterized in that: A recess is provided on the slide block, a slide groove is provided on the bottom surface of the recess, the stop portion is a retaining wall provided on the top wall of the recess and extending downward, a portion of the retaining wall in the recess close to the second side wall forms a receiving space, and when the locking block is in the second position, the toggle end of the locking block is located in the receiving space.

4. The height adjustment mechanism of the chair armrest according to claim 3, characterized in that: A connecting wall is provided on the top wall of the recess, extending from the bottom of the retaining wall to the side of the slider close to the first side wall. The connecting wall is gradually inclined upward from one end connected to the retaining wall to the other end to avoid the lock block swinging left and right. The part where the connecting wall is connected to the retaining wall forms a stop end, which is used to be pressed above the toggle end when the lock head is embedded in the slot.

5. The height adjustment mechanism of the chair armrest according to claim 4, characterized in that: The portion of the lock block between the lock head and the toggle end forms a notch for the stop end to be embedded in, and a side of the notch facing away from the lock head forms a stop surface. When the stop end is embedded in the notch, the stop wall abuts against the stop surface to prevent the lock block from swinging toward the first side wall.

6. The height adjustment mechanism of the chair armrest according to claim 3, characterized in that: A first limiting groove is arranged on the side wall of the recess, and a second limiting groove facing the first limiting groove is arranged on the side of the locking block away from the first side wall; the elastic member is a spring, and the two ends of the spring are respectively embedded in the first limiting groove and the second limiting groove.

7. The height adjustment mechanism of the chair armrest according to claim 1, characterized in that: The second side wall is provided with a groove recessed away from the first side wall, and the top surface and bottom surface of the groove respectively form two toggle parts; the lock block is provided with a toggle rod extending in a direction away from the lock head, and the end of the toggle rod away from the lock head forms a toggle end that can slide up and down in the groove.

8. The height adjustment mechanism of the chair armrest according to claim 1, characterized in that: The slot includes a support wall extending from the first side wall toward a direction away from the second side wall, and a guide wall extending from the first side wall toward a direction away from the second side wall. The support wall is arranged perpendicular to the up and down direction, or the support wall gradually tilts upward from an end connected to the first side wall toward an end away from the second side wall. The guide wall is located below the support wall, and the guide wall gradually tilts upward from an end connected to the first side wall toward an end away from the second side wall so that the guide wall can push the lock head toward the second side wall when the lock head moves downward relative to the slot inside the slot.

9. The height adjustment mechanism of the chair armrest according to claim 1, characterized in that: The first connecting arm includes two connecting plates that are arranged opposite to each other and installed together, and the sliding block is located between the two connecting plates and is integrally formed on one of the connecting plates; the outer parts of the two connecting plates are provided with an inner sleeve fixed to the two connecting plates, and the second connecting arm is fixedly connected with an outer sleeve that is provided on the outside of the inner sleeve and slidably cooperates with the inner sleeve.

10. Seat armrest, characterized in that: The invention comprises the height adjustment mechanism of the chair armrest according to any one of claims 1 to 9.

11. A seat, characterized in that: The invention comprises the chair armrest as claimed in claim 10.

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