Multi-joint armrest for seat and seat

Abstract

The utility model discloses a multi-joint armrest for a seat and the seat, the multi-joint armrest comprises an armrest body, a mounting plate, a first swing arm, a second swing arm, a first connecting mechanism and a second connecting mechanism, the first swing arm is connected with the mounting plate through the first connecting mechanism and has a first locking state and a first unlocking state; the first swing arm can be stable relative to the mounting plate in a first locking state and can swing around a first set axis in a first unlocking state; the second swing arm is arranged at the lower end of the armrest body, the second swing arm is connected with the first swing arm through a second connecting mechanism and has a second locking state and a second unlocking state, and the second swing arm can be stable relative to the first swing arm in the second locking state and can swing around a second set axis in the second unlocking state; the first set axis and the second set axis both extend in the width direction of the seat. By means of the two-stage swing armrest, the height position and the front-back position of the armrest body can be adjusted through the two-stage swing action.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of seat, specifically to a multi-joint handrail for seat and seat. BACKGROUND

[0002] The handrail of the seat can provide support for the arm of the user, which can reduce the fatigue of the user's arm. For users of different heights and body shapes, the appropriate position of the handrail will be different, therefore, the handrails of part of the seats in the related art have a position adjusting function. At present, the position adjusting function of such handrails generally adjusts the height position of the handrail relative to the seat frame, generally adopts the scheme of telescopic sleeve and locking mechanism, and the two relatively sliding sleeves are locked by the locking mechanism to maintain the stability of the handrail relative to the seat frame. After unlocking the locking mechanism, the two sleeves can relatively slide to adjust the height position of the handrail relative to the seat frame. However, for users of different heights and body shapes, the appropriate position of the handrail relative to the seat frame in the front and rear directions will also be different, and the above-mentioned scheme can only adjust the height position of the handrail. In addition, the above-mentioned scheme generally needs one hand to lock and unlock the locking mechanism, and the other hand to slide and adjust the telescopic sleeve in actual application, which is not convenient to operate. Especially considering that the seat generally has one handrail on each side of the seat frame, it is not convenient to adjust the two side handrails to the same height. SUMMARY

[0003] The utility model aims at providing a multi-joint handrail for seat and seat, which can adjust the height position and the front and rear position of the handrail body through two-stage swinging action.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] The multi-joint handrail for seat comprises a handrail body and a mounting plate for mounting with the seat frame, and further comprises a first swing arm, a second swing arm, a first connecting mechanism and a second connecting mechanism. The first swing arm is connected with the mounting plate through the first connecting mechanism and has a first locking state and a first unlocking state relative to the mounting plate. The first swing arm is configured to remain stable relative to the mounting plate in the first locking state and to swing relative to the mounting plate about a first specified axis in the first unlocking state.

[0006] The second swing arm is arranged at the lower end of the handrail body and is connected with the first swing arm through the second connecting mechanism and has a second locking state and a second unlocking state relative to the first swing arm. The second swing arm is configured to remain stable relative to the first swing arm in the second locking state and to swing relative to the first swing arm about a second specified axis in the second unlocking state.

[0007] The first and second setting axes are spaced apart from each other and both extend along a width direction of the seat.

[0008] Preferably, the first swing arm has first and second swing strokes opposite to each other relative to the mounting plate, and the first connecting mechanism comprises:

[0009] a housing fixedly arranged on the mounting plate;

[0010] a clamping member swingably arranged on the housing and having a positioning state and a swing state relative to the housing, the clamping member being formed with a clamping tooth;

[0011] a first connecting shaft rotatably arranged on the housing and fixedly arranged on the first swing arm;

[0012] a transmission wheel fixedly sleeved on the first connecting shaft and coaxially arranged with the first connecting shaft, the transmission wheel being provided with first tooth grooves continuously distributed along a circumferential direction thereof;

[0013] a resilient member arranged between the housing and the clamping member and pressing the clamping member so as to have a tendency to engage the clamping tooth with the first tooth grooves; and

[0014] a positioning structure arranged on the housing and used for clamping the clamping member so as to make the clamping member in the positioning state;

[0015] wherein the transmission wheel is formed with a first driving portion and a second driving portion on both sides of the first tooth grooves along the circumferential direction;

[0016] the first driving portion is used for driving the clamping member to swing to clamp the positioning structure at an end of the first swing stroke, so that the clamping member is in the positioning state in the second swing stroke and can be kept separated from the first tooth grooves;

[0017] the second driving portion is used for driving the clamping member to swing to separate from the positioning structure at an end of the second swing stroke, so that the clamping member is in the swing state in the first swing stroke and can be engaged with the first tooth grooves under the action of the resilient member.

[0018] Preferably, the housing comprises:

[0019] a fixed housing formed with a mounting cavity, the clamping member, the transmission wheel, the resilient member and the positioning structure being arranged in the mounting cavity;

[0020] a limiting plate arranged in the mounting cavity and used for limiting axial displacement of the clamping member and the transmission wheel along the first setting axis; and

[0021] a cover plate covered on the fixed housing and located at an opening of the mounting cavity.

[0022] The fixed shell, the limiting plate and the cover plate are fixedly connected with each other and fixedly installed on the mounting plate, and the first connecting shaft penetrates through the fixed shell, the limiting plate and the cover plate and is rotationally connected with the three.

[0023] Preferably, one end of the first swing arm extends into the mounting cavity and is located between the limiting plate and the cover plate, and the limiting plate and the cover plate cooperate to limit the axial displacement of the first swing arm along the first specified axis.

[0024] The end of the first swing arm extending into the mounting cavity is formed with a connecting hole, and the first connecting shaft penetrates through the connecting hole and is key-connected with the connecting hole.

[0025] Preferably, the clamping piece is formed with a clamping jaw, the positioning structure is a metal spring plate arranged in the fixed shell, the metal spring plate is formed with a first bending portion, the metal spring plate is configured to be capable of being deformed to make the first bending portion engage with the clamping jaw when the clamping piece is driven by the first driving portion, and the metal spring plate is further configured to be capable of being deformed to make the first bending portion disengage from the clamping jaw when the clamping piece is driven by the second driving portion.

[0026] And / or, the bottom wall of the fixed shell is formed with an opening, the clamping piece is formed with a clamping shaft, the clamping shaft extends into the opening and is swingably arranged in the opening, and the positioning structure is an elastic arm formed on the fixed shell and located in the opening, the elastic arm is formed with a second bending portion, the elastic arm is configured to be capable of being deformed to make the second bending portion engage with the clamping shaft when the clamping piece is driven by the first driving portion, and the elastic arm is further configured to be capable of being deformed to make the second bending portion disengage from the clamping shaft when the clamping piece is driven by the second driving portion.

[0027] Preferably, the second connecting mechanism includes a second connecting shaft, an actuating rod and a reset piece, the second swing arm is rotationally arranged on the first swing arm through the second connecting shaft, the actuating rod is arranged on the second swing arm and has a first position and a second position relative to the second swing arm, and the reset piece is arranged between the actuating rod and the second swing arm and presses the actuating rod to make the actuating rod have a tendency to act to the first position.

[0028] One end of the actuating rod is formed with a pressing portion, and the actuating rod is configured to be capable of being switched from the first position to the second position by overcoming the action of the reset piece after the pressing portion is pressed.

[0029] The first swing arm is circumferentially provided with a plurality of second tooth grooves along a second specified axis, the other end of the actuating rod is formed with a clamping portion matched with the second tooth grooves, the clamping portion is clamped into the second tooth grooves when the actuating rod is located at the first position, and the clamping portion is separated from the second tooth grooves when the actuating rod is located at the second position.

[0030] Preferably, the first swing arm is formed with two spaced apart connecting ends at an end thereof away from the mounting plate, at least one of the connecting ends is formed with the second tooth groove, the second swing arm comprises an upper shell for connecting with the handrail body and a connecting shell formed on the upper shell, the connecting shell extends into the space between the two connecting ends, and the second connecting shaft is arranged through the connecting ends and the connecting shell;

[0031] The actuating rod is arranged to swing in the upper shell, the pressing part extends out of the upper shell, the clamping part extends into the connecting shell and extends out of the connecting shell to the second tooth groove.

[0032] Preferably, the handrail body comprises a bottom shell formed with a cavity, a bottom wall of the bottom shell is provided with a through hole extending along the length direction of the bottom shell, a top end surface of the upper shell is slidably connected with a lower end surface of the bottom shell, the top end surface of the upper shell is formed with a protrusion extending into the cavity through the through hole, the multi-joint handrail further comprises a limiting disc arranged in the cavity and a retaining mechanism arranged between the limiting disc and a side wall of the cavity, the limiting disc is connected with the protrusion and fixedly connected with the protrusion in the circumferential direction, and the retaining mechanism is used for retaining the handrail body stably relative to the upper shell.

[0033] Preferably, the retaining mechanism comprises an elastic piece, a clamping block and a plurality of third tooth grooves formed on the side wall of the cavity, the plurality of third tooth grooves are arranged along the length direction of the handrail body, and the clamping block is formed with an engaging part capable of engaging with the third tooth grooves.

[0034] The limiting disc is formed with a sliding groove extending along the width direction of the handrail body, the elastic piece and the clamping block are arranged in the sliding groove, and the elastic piece presses the clamping block in such a way that the engaging part has a tendency to be clamped into the third tooth groove.

[0035] In addition, in order to achieve the above object, the utility model also adopts the following technical scheme:

[0036] The seat comprises the multi-joint handrail according to any one of the above technical schemes.

[0037] Compared with the prior art, the utility model has the beneficial effects that:

[0038] By setting the first swing arm, the second swing arm, the first connecting mechanism and the second connecting mechanism, when the user needs to adjust the position of the armrest body, the user can drive the second swing arm and the armrest body to swing around the first set axis through the swing action of the first swing arm, and then drive the armrest body to swing around the second set axis through the swing action of the second swing arm. Since the first set axis and the second set axis both extend along the width direction of the seat, the position of the armrest body relative to the seat frame of the seat can be changed in the height direction and the front-rear direction, so that the position adjustment of the armrest body is realized. In addition, the angle of the armrest body relative to the ground can also be adjusted through the above operation, so that the armrest body can be kept horizontal relative to the ground (conventional design) or have a certain inclination angle relative to the ground, so as to meet the individual needs of customers. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 A structural schematic diagram of a multi-joint armrest for a seat is provided for the embodiments of the present application.

[0040] Figure 2 An explosion of the first swing arm, the first connecting mechanism and the mounting plate Figure 1 ;

[0041] Figure 3 An explosion of the first swing arm, the first connecting mechanism and the mounting plate Figure 2 ;

[0042] Figure 4 A schematic diagram of the clamping piece in the first connecting mechanism being clamped with the first tooth groove in the first swing stroke

[0043] Figure 5 A schematic diagram of the clamping piece in the first connecting mechanism being separated from the first tooth groove in the first swing stroke

[0044] Figure 6 A schematic diagram of the clamping piece in the first connecting mechanism being clamped with the positioning structure under the driving of the first driving part Figure 1 ;

[0045] Figure 7 A schematic diagram of the clamping piece in the first connecting mechanism being clamped with the positioning structure under the driving of the first driving part Figure 2 ;

[0046] Figure 8 A schematic diagram of the clamping piece in the first connecting mechanism being separated from the first tooth groove in the second swing stroke

[0047] Figure 9 A schematic diagram of the clamping piece in the first connecting mechanism being driven by the second driving part

[0048] Figure 10 An explosion of the second swing arm, the second connecting mechanism and the first swing armFigure 1 ;

[0049] Figure 11 isometric view of the second swing arm, the second connecting mechanism and the first swing arm Figure 2 ;

[0050] Figure 12 isometric view of the handrail body and the second swing arm.

[0051] Wherein, 1, handrail body; 10, bottom shell; 100, through hole; 101, third tooth groove; 11, upper cover; 2, mounting plate; 3, first swing arm; 30, connecting hole; 31, connecting end; 310, second tooth groove; 32, first swing section; 33, second swing section; 4, second swing arm; 40, upper shell; 400, protrusion; 41, connecting shell; 5, first connecting mechanism; 50, shell; 500, fixed shell; 501, limiting plate; 502, cover plate; 51, clamping piece; 510, clamping jaw; 511, clamping shaft; 512, clamping tooth; 52, first connecting shaft; 53, transmission wheel; 530, first tooth groove; 531, first driving part; 532, second driving part; 54, elastic piece; 55, metal elastic sheet; 550, first bending part; 56, elastic arm; 560, second bending part; 6, second connecting mechanism; 60, second connecting shaft; 61, actuating rod; 610, pressing part; 611, clamping part; 62, reset piece; 7, limiting disc; 70, sliding groove; 8, elastic piece; 9, clamping block.

[0052] Figure 4 、 Figure 5 、 Figure 6 、 Figure 8 and Figure 9 is Figure 1 front view in the direction of the arrow P in Fig. DETAILED DESCRIPTION

[0053] Hereinafter, the present application will be further described with reference to the drawings and specific embodiments, it should be noted that the following described embodiments or technical features between each of the embodiments can be combined to form a new embodiment, unless otherwise specified. Except for the special description, the materials and equipment used in the embodiments can be purchased from the market. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals 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.

[0054] In the description of the application, it needs to be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In the description of the application, the meaning of "a plurality of" is two or more, unless otherwise specifically specified and limited.

[0055] In the description of the application, it needs to be understood that unless otherwise explicitly specified and limited, the terms "connected", "communicated", "connected" should be understood in a broad sense, for example, it can be fixedly connected, it can be connected through an intermediate medium, it can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0056] The embodiment provides a multi-joint armrest for a seat, as shown in Figure 1 、 Figure 2 and Figure 3 , which comprises an armrest body 1, a mounting plate 2, a first swing arm 3, a second swing arm 4, a first connecting mechanism 5 and a second connecting mechanism 6. Among them, the mounting plate 2 is used to be mounted with the seat frame of the seat, and the specific mounting method can adopt the existing scheme, for example, the mounting plate 2 can be fixedly mounted on the seat frame through screws or buckle structure, or the mounting plate 2 can be rotatably mounted on the seat frame, which will not be described here. The mounting plate 2 in the embodiment is provided with a mounting hole, and a screw can be used to pass through the mounting hole and lock and fix the mounting plate 2 on the side of the seat frame.

[0057] The first swing arm 3 is connected with the mounting plate 2 through the first connecting mechanism 5 and has a first locking state and a first unlocking state relative to the mounting plate 2. The first swing arm 3 is configured to be able to keep stable relative to the mounting plate 2 in the first locking state, and be able to swing relative to the mounting plate 2 about a first specified axis in the first unlocking state. The second swing arm 4 is provided at the lower end of the armrest body 1, and the second swing arm 4 is connected with the first swing arm 3 through the second connecting mechanism 6 and has a second locking state and a second unlocking state relative to the first swing arm 3. The second swing arm 4 is configured to be able to keep stable relative to the first swing arm 3 in the second locking state, and be able to swing relative to the first swing arm 3 about a second specified axis in the second unlocking state. At the same time, the first specified axis and the second specified axis are spaced apart from each other and both extend along the width direction of the seat.

[0058] By setting the first swing arm 3, the second swing arm 4, the first connecting mechanism 5 and the second connecting mechanism 6, when the user needs to adjust the position of the armrest body 1, the user can drive the second swing arm 4 and the armrest body 1 to swing around the first set axis through the swinging action of the first swing arm 3, and then drive the armrest body 1 to swing around the second set axis through the swinging action of the second swing arm 4. Since the first set axis and the second set axis both extend along the width direction of the seat, the position of the armrest body 1 relative to the seat frame of the seat can be changed in the height direction (up-down direction) and the front-rear direction, so that the position adjustment of the armrest body 1 is realized. In addition, the angle of the armrest body 1 relative to the ground can also be adjusted through the above operation, so that the armrest body 1 can be kept horizontal relative to the ground (conventional design) or have a certain inclination angle relative to the ground, so as to meet the individual needs of customers.

[0059] As shown in Figure 1 In the embodiment, the up-down direction and the front-rear direction are based on the placement direction of the seat to which the multi-joint armrest is applied, the height direction of the seat is the up-down direction, and the front-rear direction of the seat (the side on which the back of the seat is located is the rear) is the front-rear direction.

[0060] In the embodiment, the first swing arm 3 has first and second swing strokes opposite to each other relative to the mounting plate 2, and it is assumed that the direction of the arrow P in Figure 1 In the embodiment, the first swing stroke refers to the stroke of the first swing arm 3 rotating counterclockwise relative to the mounting plate 2, and correspondingly, the second swing stroke refers to the stroke of the first swing arm 3 rotating clockwise relative to the mounting plate 2.

[0061] The first connecting mechanism 5 in the embodiment includes a housing 50, a clamping piece 51, a first connecting shaft 52, a transmission wheel 53, an elastic piece 54 and a positioning structure. The housing 50 is fixedly arranged on the mounting plate 2, and the first connecting shaft 52 is rotatably arranged on the housing 50 and fixedly arranged on the first swing arm 3, so that the first swing arm 3 is rotatably arranged on the housing 50 through the first connecting shaft 52. The first set axis is the central axis of the first connecting shaft 52.

[0062] The transmission wheel 53 is fixedly sleeved on the first connecting shaft 52 and coaxially arranged with the first connecting shaft 52, and the elastic piece 54 is arranged between the transmission wheel 53 and the first connecting shaft 52. Figure 4As shown in the figures, the transmission wheel 53 is provided with a plurality of first tooth grooves 530 distributed continuously along the circumference thereof, the clamping member 51 is swingably arranged on the housing 50 and has a positioning state and a swing state relative to the housing 50, and the clamping member 51 is formed with clamping teeth 512. The clamping teeth 512 are adapted to the first tooth grooves 530 and can be engaged with each other. The elastic member 54 is arranged between the housing 50 and the clamping member 51 and presses the clamping member 51 so that the clamping teeth 512 have a tendency to be engaged with the first tooth grooves 530. The positioning structure is arranged on the housing 50 and is used to be clamped with the clamping member 51 so that the clamping member 51 is in the positioning state.

[0063] In combination with Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 , in the embodiment, the transmission wheel 53 is formed with a first driving portion 531 and a second driving portion 532 on both sides of the first tooth grooves 530 along the circumference, the first driving portion 531 is used to drive the clamping member 51 to swing to be clamped with the positioning structure at the end of the first swing stroke, so that the clamping member 51 is in the positioning state in the second swing stroke and can be kept separated from the first tooth grooves 530. The second driving portion 532 is used to drive the clamping member 51 to swing to be separated from the positioning structure at the end of the second swing stroke, so that the clamping member 51 is in the swing state in the first swing stroke and can be engaged with the first tooth grooves 530 under the action of the elastic member 54. It is easy to understand that when the clamping member 51 is in the positioning state relative to the housing 50, the first swing arm 3 is in the first locking state relative to the mounting plate 2; when the clamping member 51 is in the swing state relative to the housing 50, the first swing arm 3 is in the first unlocking state relative to the mounting plate 2.

[0064] The housing 50 in the embodiment includes a fixed shell 500, a limiting plate 501 and a cover plate 502. The fixed shell 500 is formed with a mounting cavity, and the clamping member 51, the transmission wheel 53, the elastic member 54 and the positioning structure are arranged in the mounting cavity. The limiting plate 501 is arranged in the mounting cavity and is used to limit the axial displacement of the clamping member 51 and the transmission wheel 53 along the first specified axis, and the cover plate 502 is arranged on the fixed shell 500 and is located at the opening of the mounting cavity. The fixed shell 500, the limiting plate 501 and the cover plate 502 are fixedly connected with each other and are fixedly mounted on the mounting plate 2, and the first connecting shaft 52 penetrates through the fixed shell 500, the limiting plate 501 and the cover plate 502 and is rotatably connected with them.

[0065] The housing 50 employs the aforementioned structural design, facilitating assembly of the various components of the first connecting mechanism 5. During assembly, the clamping member 51, transmission wheel 53, elastic member 54, and positioning structure are first positioned within the mounting cavity. The first connecting shaft 52 is then passed through the fixed housing 500 and transmission wheel 53. The limiting plate 501 and cover plate 502 are then sequentially positioned over the first connecting shaft 52 and secured to the fixed housing 500 via screws. The limiting plate 501 cooperates with the bottom wall of the fixed housing 500 to limit axial displacement of the clamping member 51 and transmission wheel 53 along the first set axis, while preserving the ability of the transmission wheel 53 and clamping member 51 to swing relative to the fixed housing 500.

[0066] It should be noted that the aforementioned "transmission wheel 53 is fixedly sleeved on the outside of the first connecting shaft 52" can be either a tight fit (interference fit) sleeved connection between the transmission wheel 53 and the first connecting shaft 52 or a keyed connection between the transmission wheel 53 and the first connecting shaft 52. In this embodiment, the transmission wheel 53 and the first connecting shaft 52 are keyed to maintain relative fixation along the circumference of the first set axis. The transmission wheel 53 is then limited axially along the first set axis by the limiting plate 501, thereby maintaining the transmission wheel 53 in place relative to the first connecting shaft 52.

[0067] By fixing the first swing arm 3 to the first connecting shaft 52, the first connecting shaft 52 can be driven to rotate when the first swing arm 3 swings, thereby driving the transmission wheel 53 to rotate, so that the first tooth groove 530 on the transmission wheel 53 engages or disengages with the latch 512 on the latch 51. Specifically, in this embodiment, one end of the first swing arm 3 is inserted into the installation cavity and is located between the limit plate 501 and the cover plate 502. The limit plate 501 and the cover plate 502 cooperate to limit the axial displacement of the first swing arm 3 along the first set axis, while not affecting the rotation of the first swing arm 3 relative to the housing 50. At the same time, a connecting hole 30 is formed at the end of the first swing arm 3 that extends into the installation cavity. The first connecting shaft 52 passes through the connecting hole 30 and the two are key-fitted. It is easy to understand that it is sufficient to design the rotating holes for the first connecting shaft 52 to pass through on the fixed shell 500, the limit plate 501 and the cover plate 502 as circular holes that rotate with the first connecting shaft 52.

[0068] like Figure 4 As shown in , at this time, the first swing arm 3 is in the initial section of the first swing stroke. Accordingly, the second driving portion 532 on the transmission wheel 53 has just completed driving the clamping member 51 at the end of the second swing stroke. The clamping member 51 is separated from the positioning structure and swings under the action of the elastic member 54, so that the locking tooth 512 on the clamping member 51 is locked in the first tooth groove 530 on the transmission wheel 53.

[0069] Assume that Figure 4The position of the handrail body 1 corresponding to the state shown in Fig. 1 is the initial position. When it is necessary to adjust the position of the handrail body 1 upward, the first swing arm 3 can be swung in the counterclockwise direction relative to the mounting plate 2 (the first swing arm 3 performs a first swing stroke), which can drive the transmission wheel 53 to rotate in the counterclockwise direction relative to the fixed shell 500, so that the relative position of the transmission wheel 53 and the fixed shell 500 is changed from Figure 4 to the state shown in Fig. 2. Figure 5 That is, the pawl tooth 512 on the clamping piece 51 can be caused to disengage from the first tooth groove 530 on the transmission wheel 53. It can be easily understood that, when the first swing arm 3 is continuously swung, the pawl tooth 512 on the clamping piece 51 can be caused to engage into the next adjacent first tooth groove 530 on the transmission wheel 53. The engagement cooperation described in the embodiment refers to the action that the pawl tooth 512 on the clamping piece 51 and the first tooth groove 530 can be caused to engage and disengage under the cooperation of external force and the elastic piece 54.

[0070] When the first swing arm 3 is swung to the end section of the first swing stroke, the relative position of the transmission wheel 53 and the fixed shell 500 is as shown in Fig. 3. Figure 6 At this time, the first driving part 531 on the transmission wheel 53 exerts pressure on the clamping piece 51 and drives the clamping piece 51 to engage with the positioning structure. In combination with Figs. 4 and 5, Figure 6 and Figure 7 It can be seen that two kinds of positioning structures are arranged in the shell 50 in the embodiment, which will be described in detail later.

[0071] In combination with Figs. 4 and 5, Figure 6 and Figure 8 At this time, under the restriction of the internal structure of the fixed shell 500 and the clamping piece 51, the transmission wheel 53 cannot continue to rotate in the counterclockwise direction, that is, the first swing arm 3 cannot continue to swing in the counterclockwise direction. Then, the first swing arm 3 can perform a second swing stroke, that is, the first swing arm 3 can be swung in the clockwise direction relative to the mounting plate 2, which can drive the handrail body 1 to descend. During the entire second swing stroke, because the clamping piece 51 engages with the positioning structure, the pawl tooth 512 on the clamping piece 51 and the first tooth groove 530 on the transmission wheel 53 are kept separated, and the first swing arm 3 can be swung to the end section of the second swing stroke without the action of too much external force, reaching the state shown in Fig. 6. Figure 9 Then, the second driving part 532 can exert pressure on the clamping piece 51 and drive the clamping piece 51 to disengage from the positioning structure. Then, the clamping piece 51 will be swung to the state shown in Fig. 7 under the action of the elastic piece 54, and the pawl tooth 512 in the clamping piece 51 and the first tooth groove 530 on the transmission wheel 53 are engaged and cooperated. Figure 4

[0072] In combination with Figs. 4 and 5, Figure 2 , Figure 6 and Figure 7 ​The positioning structure described in the embodiment is explained as follows: the positioning structure in the embodiment includes two schemes, one is the metal spring 55 arranged in the fixed shell 500, and the other is the elastic arm 56 formed on the fixed shell 500. Specifically, the clamping piece 51 in the embodiment is formed with the clamping jaw 510, the metal spring 55 is formed with the first bending part 550, the metal spring 55 is configured to be able to be engaged with the clamping jaw 510 by deformation when the clamping piece 51 is driven by the first driving part 531, and the metal spring 55 is further configured to be able to be disengaged from the clamping jaw 510 by deformation when the clamping piece 51 is driven by the second driving part 532. That is, by using the characteristic that the metal spring 55 can be deformed and the structural design of the first bending part 550 and the clamping jaw 510, the clamping piece 51 can realize the switching between the positioning state and the swing state under the driving of the first driving part 531 and the second driving part 532.

[0073] In addition, the bottom wall of the fixed shell 500 is formed with an opening, the clamping piece 51 is formed with the clamping shaft 511, the clamping shaft 511 extends into the opening and is swingably arranged in the opening, and the elastic arm 56 is also located in the opening. The elastic arm 56 is formed with the second bending part 560, the elastic arm 56 is configured to be able to be engaged with the clamping shaft 511 by deformation when the clamping piece 51 is driven by the first driving part 531, and the elastic arm 56 is further configured to be able to be disengaged from the clamping shaft 511 by deformation when the clamping piece 51 is driven by the second driving part 532. That is, by using the characteristic that the elastic arm 56 can be deformed and the structural design of the second bending part 560 and the clamping shaft 511, the clamping piece 51 can realize the switching between the positioning state and the swing state under the driving of the first driving part 531 and the second driving part 532.

[0074] It is easy to understand that the principle of the design of the two positioning structures is basically the same, and in other optional embodiments, only one of the positioning structures can be used.

[0075] The embodiment shows a preferred scheme of the first connecting mechanism 5, which is a self-locking / self-unlocking mechanism, as known from the above detailed description. The user does not need to operate with both hands, but only needs to pull the first swing arm 3 or the handrail body 1 with one hand to drive the first swing arm 3 to swing relative to the mounting plate 2, thereby reducing the operation difficulty.

[0076] In combination with Figure 1 , Figure 10 and Figure 11As shown in the figure, the second connecting mechanism 6 in the embodiment includes a second connecting shaft 60, an actuating rod 61 and a reset member 62. The second swing arm 4 is rotatably arranged on the first swing arm 3 through the second connecting shaft 60. The actuating rod 61 is arranged on the second swing arm 4 and has a first position and a second position relative to the second swing arm 4. The reset member 62 is arranged between the actuating rod 61 and the second swing arm 4 and exerts pressure on the actuating rod 61 so that the actuating rod 61 has a tendency to move to the first position. The second setting axis is the central axis of the second connecting shaft 60.

[0077] One end of the actuating rod 61 is formed with a pressing portion 610. The actuating rod 61 is configured to be switched from the first position to the second position against the action of the reset member 62 after the pressing portion 610 is pressed. The first swing arm 3 is provided with a plurality of second tooth grooves 310 along the circumference of the second setting axis. The other end of the actuating rod 61 is formed with a clamping portion 611 matched with the second tooth grooves 310. The clamping portion 611 is clamped into the second tooth grooves 310 when the actuating rod 61 is in the first position. The clamping portion 611 is separated from the second tooth grooves 310 when the actuating rod 61 is in the second position.

[0078] Through the above design, when the user needs to swing the second swing arm 4 relative to the first swing arm 3, the pressing portion 610 can be pressed to drive the actuating rod 61 to switch from the first position to the second position. At this time, the clamping portion 611 is separated from the second tooth grooves 310, and the second swing arm 4 can be rotated relative to the first swing arm 3. After rotating to the target position, the pressing on the pressing portion 610 is released, and the actuating rod 61 is switched from the second position to the first position under the action of the reset member 62. Correspondingly, the clamping portion 611 is clamped into the corresponding second tooth groove 310, so that the second swing arm 4 and the first swing arm 3 remain relatively stable. It is easy to understand that when the actuating rod 61 is in the first position, the second swing arm 4 is in the second locked state relative to the first swing arm 3. When the actuating rod 61 is in the second position, the second swing arm 4 is in the second unlocked state relative to the first swing arm 3.

[0079] Specifically in the embodiment, the first swing arm 3 is formed with two spaced apart connecting end heads 31 at the end thereof away from the mounting plate 2. At least one connecting end head 31 is formed with a second tooth groove 310. The second swing arm 4 includes an upper shell 40 for connecting with the handrail body 1 and a connecting shell 41 formed on the upper shell 40. The connecting shell 41 extends into the space between the two connecting end heads 31, and the second connecting shaft 60 extends through the connecting end heads 31 and the connecting shell 41. The actuating rod 61 is swingably arranged in the upper shell 40, and the pressing portion 610 extends out of the upper shell 40. The clamping portion 611 extends to the connecting shell 41 and extends out of the connecting shell 41 to the second tooth groove 310. Through the above structural design, the assembly operation of each component of the second connecting mechanism 6 is facilitated.

[0080] This embodiment shows a preferred solution of the second connecting mechanism 6. It is easy to understand that in other optional embodiments, the first swing arm 3 can also be swingably connected to the mounting plate 2 through the second connecting mechanism 6, or the second swing arm 4 can be swingably connected to the first swing arm 3 through the first connecting mechanism 5.

[0081] It should be noted that, generally, users are accustomed to setting the upper surface of the armrest body 1 parallel to the ground on which the chair is placed, that is, setting the upper surface of the armrest body 1 horizontally. When the first swing arm 3 is swung to adjust the height position of the armrest body 1, the upper surface of the armrest body 1 will be tilted relative to the ground. At this time, the armrest body 1 can be driven to swing by swinging the second swing arm 4 to readjust the upper surface of the armrest body 1 to be parallel to the ground. Of course, according to the needs of the user, the upper surface of the armrest body 1 can also be adjusted to a certain inclination angle with the ground by swinging the first swing arm 3 and / or the second swing arm 4.

[0082] like Figure 1 As shown in , the first swing arm 3 in this embodiment includes a first swing segment 32 and a second swing segment 33 connected to each other. The connecting hole 30 is provided at one end of the first swing segment 32, and the connecting end portion is provided at one end of the second swing segment 33. In various embodiments, the first swing segment 32 and the second swing segment 33 can be fixedly connected or formed as an integral structure. Alternatively, the second swing segment 33 can be designed to swing relative to the first swing segment 32 about a predetermined axis, the predetermined axis being the height direction of the seat, i.e., the predetermined axis is perpendicular to the first set axis and the second set axis. In this way, the position of the armrest body 1 relative to the seat frame along the seat width direction can also be adjusted.

[0083] As previously described, the swinging motion of the first swing arm 3 and the second swing arm 4 allows adjustment of the height and fore-aft positions of the armrest body 1 relative to the seat frame, and also allows adjustment of the angle of inclination of the armrest body 1 relative to the seat frame. It will be readily understood that, when employing the above-described solution, the height position of the armrest body 1 can be adjusted more precisely, but its fore-aft position can only be adjusted in accordance with its height position. To this end, in this embodiment, the armrest body 1 is further designed to slide relative to the second swing arm 4 in the fore-aft direction, enabling precise adjustment of the fore-aft position of the armrest body 1 relative to the seat frame.

[0084] Specifically, such as Figure 12As shown in the figure, the handrail body 1 in the embodiment includes a bottom shell 10 with a cavity, the bottom wall of the bottom shell 10 is provided with a through hole 100 extending along the length direction of the bottom shell 10, the top end surface of the upper shell 40 is in sliding fit with the lower end surface of the bottom shell 10, and the top end surface of the upper shell 40 is formed with a protrusion 400 extending into the cavity from the through hole 100. By the cooperation of the protrusion 400 and the inner wall of the through hole 100, the sliding of the bottom shell 10 along the length direction of the through hole 100 relative to the upper shell 40 can be limited. Meanwhile, the multi-joint handrail further includes a limiting disc 7 arranged in the cavity and a retaining mechanism arranged between the limiting disc 7 and the side wall of the cavity, the limiting disc 7 is connected with the protrusion 400 and the two are fixed in the circumferential direction (in the embodiment, the two are in key fit and then locked by screws), and the retaining mechanism is used for keeping the handrail body 1 stable relative to the upper shell 40. The handrail body 1 in the embodiment further includes an upper cover 11 detachably fixedly arranged on the bottom shell 10, which facilitates assembly operation, i.e., the bottom shell 10, the upper shell 40, the limiting disc 7 and other structures are assembled first, and then the upper cover 11 is fixedly arranged on the bottom shell 10, and the upper cover 11 plays a role of closing the cavity.

[0085] The retaining mechanism in the embodiment includes a resilient member 8, a clamping block 9 and a plurality of third tooth grooves 101 formed on the side wall of the cavity, the plurality of third tooth grooves 101 are arranged along the length direction of the handrail body 1, and the clamping block 9 is formed with an engagement part capable of engaging with the third tooth grooves 101. The limiting disc 7 is formed with a sliding groove 70 extending along the width direction of the handrail body 1, and the resilient member 8 and the clamping block 9 are arranged in the sliding groove 70, and the resilient member 8 exerts pressure on the clamping block 9 so that the engagement part has a tendency to be clamped into the third tooth groove 101. Through the above structure design, under the action of the retaining mechanism, the handrail body 1 is kept stable relative to the second swing arm 4 without large external force. When the user needs to adjust the position of the handrail body 1 relative to the seat frame in the front-back direction, the handrail body 1 can be pressed, and under the interaction of the inner wall of the third tooth groove 101 and the engagement part on the clamping block 9, the clamping block 9 compresses the resilient member 8 and is clamped out of the third tooth groove 101. After the handrail body 1 is slightly displaced, the clamping block 9 moves under the elastic pressure of the resilient member 8, so that the engagement part is clamped into the adjacent third tooth groove 101. The above process can be repeated until the handrail body 1 moves to the target position.

[0086] The resilient member 54, the reset member 62 and the resilient member 8 in the embodiment are all compression springs, and in alternative embodiments, the resilient member 54, the reset member 62 and the resilient member 8 can also be elastic structures such as rubber columns and metal sheets, as long as their deformation ability meets the use requirement.

[0087] It should be noted that the first connecting mechanism 5, the second connecting mechanism 6 and the retaining mechanism provided by the embodiment also have the following advantages: in the first connecting mechanism 5, the locking is achieved by the cooperation of the first tooth groove 530 and the clamping tooth 512; in the second connecting mechanism 6, the locking is achieved by the cooperation of the second tooth groove 310 and the clamping part 611; and in the retaining mechanism, the locking is achieved by the cooperation of the third tooth groove 101 and the meshing part. Therefore, during the adjustment of the position of the armrest body 1, the adjustment is gear adjustment. It is easy to understand that a set of armrest bodies 1 is generally arranged on the left and right sides of the seat, and the adjustment process is designed as gear adjustment, so that the symmetrical adjustment operation of the armrest bodies 1 on the left and right sides is facilitated, and the positions of the armrest bodies 1 on the left and right sides relative to the seat frame in the front-back direction and the height direction are easily adjusted to be the same. Especially in the case that the first connecting mechanism 5, the second connecting mechanism 6 and the retaining mechanism are all suitable for single-handed adjustment operation, the user can use the left and right hands to adjust the positions of the armrest bodies 1 on the left and right sides of the seat frame, respectively.

[0088] The multi-joint armrest provided by the embodiment can be applied to a seat. Generally, the multi-joint armrest is installed on a seat frame of a seat.

[0089] Finally, it should be noted that the above-mentioned embodiments are only optional embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-substantial changes and replacements made by those skilled in the art on the basis of the present application all belong to the scope of protection required by the present application.

Claims

1. A multi-articulated armrest for a seat, the multi-articulated armrest comprising an armrest body and a mounting plate for mounting with a seat frame of a seat, characterised in that, The multi-joint handrail further comprises a first swing arm, a second swing arm, a first connecting mechanism and a second connecting mechanism, the first swing arm is connected with the mounting plate through the first connecting mechanism and has a first locking state and a first unlocking state relative to the mounting plate, the first swing arm is configured to be able to keep stable relative to the mounting plate in the first locking state and to be able to swing relative to the mounting plate about a first specified axis in the first unlocking state; The second swing arm is arranged at the lower end of the handrail body, the second swing arm is connected with the first swing arm through the second connecting mechanism and has a second locking state and a second unlocking state relative to the first swing arm, the second swing arm is configured to be able to keep stable relative to the first swing arm in the second locking state and to be able to swing relative to the first swing arm about a second specified axis in the second unlocking state; The first specified axis and the second specified axis are spaced from each other and both extend along the width direction of the seat.

2. The multi-articulating handrail of claim 1, wherein, The first swing arm has a first swing stroke and a second swing stroke opposite to each other relative to the mounting plate, the first connecting mechanism comprises: a housing fixedly arranged on the mounting plate; a clamping piece swingingly arranged on the housing and having a positioning state and a swing state relative to the housing, the clamping piece is formed with a clamping tooth; a first connecting shaft rotatably arranged on the housing and fixedly arranged on the first swing arm; a transmission wheel fixedly sleeved outside the first connecting shaft and coaxially arranged with the first connecting shaft, the transmission wheel is provided with a plurality of first tooth grooves continuously distributed along the circumference thereof; a resilient piece arranged between the housing and the clamping piece and pressing the clamping piece so that the clamping tooth has a tendency to engage with the first tooth groove; and a positioning structure arranged on the housing and used for clamping the clamping piece to make the clamping piece in the positioning state; wherein the transmission wheel is formed with a first driving part and a second driving part on both sides of the first tooth groove along the circumference thereof; the first driving part is used for driving the clamping piece to swing to clamp the positioning structure at the end of the first swing stroke, so that the clamping piece is in the positioning state in the second swing stroke and can keep separated from the first tooth groove; the second driving part is used for driving the clamping piece to swing to separate from the positioning structure at the end of the second swing stroke, so that the clamping piece is in the swing state in the first swing stroke and can engage with the first tooth groove under the action of the resilient piece.

3. The multi-articulating handrail of claim 2, wherein, The housing comprises: a fixed housing formed with a mounting cavity, the clamping piece, the transmission wheel, the resilient piece and the positioning structure are all arranged in the mounting cavity; a limiting plate arranged in the mounting cavity and used for limiting the axial displacement of the clamping piece and the transmission wheel along the first specified axis; and a cover plate covering the fixed housing and located at the opening of the mounting cavity; wherein the fixed housing, the limiting plate and the cover plate are fixedly connected with each other and fixedly arranged on the mounting plate, the first connecting shaft penetrates through the fixed housing, the limiting plate and the cover plate and is rotatably connected with the three.

4. The multi-articulating handrail of claim 3, wherein, One end of the first swing arm extends into the mounting cavity and is located between the limiting plate and the cover plate, the limiting plate and the cover plate cooperate to limit the axial displacement of the first swing arm along the first specified axis. The first swing arm is provided with a connecting hole at one end thereof extending into the mounting cavity, and the first connecting shaft passes through the connecting hole and is keyed to the connecting hole.

5. The multi-articulating handrail of claim 3, wherein, The clamping member is provided with a clamping jaw, the positioning structure is a metal spring sheet arranged in the fixed shell, the metal spring sheet is provided with a first bending portion, the metal spring sheet is configured to be capable of being engaged with the clamping jaw by deformation when the clamping member is driven by the first driving portion, and the metal spring sheet is further configured to be capable of being disengaged from the clamping jaw by deformation when the clamping member is driven by the second driving portion. The bottom wall of the fixed shell is provided with an opening, the clamping member is provided with a clamping shaft, the clamping shaft extends into the opening and is swingably arranged in the opening, the positioning structure is an elastic arm arranged on the fixed shell and located in the opening, the elastic arm is provided with a second bending portion, the elastic arm is configured to be capable of being engaged with the clamping shaft by deformation when the clamping member is driven by the first driving portion, and the elastic arm is further configured to be capable of being disengaged from the clamping shaft by deformation when the clamping member is driven by the second driving portion.

6. The multi-articulating handrail of any of claims 1 to 5, wherein, The second connecting mechanism comprises a second connecting shaft, an actuating rod and a reset member, the second swing arm is swingably arranged on the first swing arm by the second connecting shaft, the actuating rod is arranged on the second swing arm and has a first position and a second position relative to the second swing arm, and the reset member is arranged between the actuating rod and the second swing arm and presses the actuating rod so that the actuating rod has a tendency to move to the first position. One end of the actuating rod is provided with a pressing portion, and the actuating rod is configured to be capable of being switched from the first position to the second position against the action of the reset member after the pressing portion is pressed. The first swing arm is provided with a plurality of second tooth grooves along the circumference of the second setting axis, the other end of the actuating rod is provided with a clamping portion matched with the second tooth grooves, the clamping portion is clamped into the second tooth grooves when the actuating rod is located at the first position, and the clamping portion is separated from the second tooth grooves when the actuating rod is located at the second position.

7. The multi-articulating handrail of claim 6, wherein, The first swing arm is provided with two spaced connecting end heads at the end thereof away from the mounting plate, at least one of the connecting end heads is provided with the second tooth groove, the second swing arm comprises an upper shell for connecting with the handrail body and a connecting shell formed on the upper shell, the connecting shell extends into the space between the two connecting end heads, and the second connecting shaft passes through the connecting end heads and the connecting shell. The actuating rod is swingably arranged in the upper shell, the pressing portion extends out of the upper shell, and the clamping portion extends into the connecting shell and extends out of the connecting shell to the second tooth groove.

8. The multi-articulating handrail of claim 7, wherein, The handrail body comprises a bottom shell with a cavity, a bottom wall of the bottom shell is provided with a through hole extending along the length direction of the bottom shell, a top end surface of the upper shell is in sliding fit with a lower end surface of the bottom shell, the top end surface of the upper shell is formed with a protrusion extending into the cavity through the through hole, the multi-joint handrail further comprises a limiting disc arranged in the cavity and a retaining mechanism arranged between the limiting disc and a side wall of the cavity, the limiting disc is connected with the protrusion and both are fixed in the circumferential direction, and the retaining mechanism is used for keeping the handrail body stable relative to the upper shell.

9. The multi-articulating handrail of claim 8, wherein, The retaining mechanism comprises an elastic piece, a clamping block and a plurality of third tooth grooves formed on the side wall of the cavity, the plurality of third tooth grooves are arranged along the length direction of the handrail body, and the clamping block is formed with an engagement part capable of engaging with the third tooth grooves. The limiting disc is formed with a sliding groove extending along the width direction of the handrail body, the elastic piece and the clamping block are both arranged in the sliding groove, and the elastic piece exerts pressure on the clamping block so that the engagement part has a tendency to be clamped into the third tooth groove.

10. A seat, characterized by A multi-joint handrail comprising any one of claims 1 to 9.

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