Handrail with table board

Abstract

The utility model relates to a handrail with a table board, which comprises a handrail body and a table board assembly, the table board assembly comprises a rotating part and an overturning part, the handrail body limits a main plane, the table board assembly limits a width direction, and a first axis parallel to the width direction and a second axis perpendicular to the main plane are limited between the rotating part and the overturning part; the overturning part is configured to overturn between a first position and a second position around the first axis relative to the rotating part, and the rotating part is configured to drive the overturning part to rotate between the second position and a third position and / or rotate between the second position and a fourth position around the second axis relative to the armrest body. According to the armrest with the table plate, the overturning part can be overturned out of the armrest body relative to the armrest body and the rotating part firstly, and then the overturning part and the rotating part are rotated to the front of a passenger from the outer side to the inner side together, so that interference with the passenger in the rotating process is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile seat armrests, and more specifically to an armrest with a table top. Background Art

[0002] With the development of automobile technology, passengers have higher and higher requirements for the versatility and comfort of car seats. For example, the armrests of car seats are usually equipped with a hidden table board, which can be rotated out when needed and integrated with the armrest when not needed.

[0003] In the prior art, the table top is rotatably connected to the armrest body, and the rotating portion is on the outside of the armrest (i.e., the side away from the seat back). When the table top is rotated out, it will rotate from the inside to the outside, and thus will pass through the seat. When there are passengers on the seat, it will interfere with the passengers, and the passengers need to get out of the way so that the table top can be rotated to the use state, which is very inconvenient. Utility Model Content

[0004] The utility model aims to provide an armrest with a table top, wherein the flipping portion can be flipped relative to the armrest body to the outside of the armrest body, and then rotated from the outside to the inside together with the rotating portion to the front of the passenger, thereby avoiding interference with the passenger during the rotation process.

[0005] Based on the above purpose, the utility model provides an armrest with a table top, comprising an armrest body and a table top assembly, wherein the table top assembly comprises a rotating portion and a flipping portion, the armrest body defines a main plane, the table top assembly defines a width direction, and a first axis parallel to the width direction and a second axis perpendicular to the main plane are defined between the rotating portion and the flipping portion;

[0006] The flipping portion is configured to flip between a first position and a second position around the first axis relative to the rotating portion, and the rotating portion is configured to drive the flipping portion to rotate between the second position and a third position and / or between the second position and a fourth position around the second axis relative to the armrest body.

[0007] Further, the flip part is hinged to the rotating part through at least one hinge, the flip part includes a first bottom plate and a first top plate, the rotating part includes a second bottom plate and a second top plate, the first bottom plate is fixedly connected to one end of the hinge, the second bottom plate is fixedly connected to the other end of the hinge, the first top plate is fixedly connected to the first bottom plate, and the second top plate is fixedly connected to the second bottom plate.

[0008] Furthermore, the armrest body includes a base, a frame and a cover plate which are arranged in sequence from bottom to top, the frame is fixed on the base, a rotating mechanism is fixed on the frame, the cover plate is fixedly connected to the base and covers the frame; the rotating part is connected to the rotating mechanism, and the rotating mechanism is used to rotate the rotating part relative to the frame.

[0009] Furthermore, a third through hole is provided on the frame, a first installation cavity is provided on the base, and the bottom of the rotating mechanism passes through the third through hole and is located in the first installation cavity.

[0010] Furthermore, the rotating mechanism includes a mounting base, a mounting buckle seat and a connecting piece, the mounting base is fixed on the frame, the mounting buckle seat is fixed to the mounting base, the connecting piece is clamped between the mounting base and the mounting buckle seat and can slide relative to the mounting base and the mounting buckle seat, and the rotating part is fixedly connected to the connecting piece.

[0011] Furthermore, a ball mounting seat is sleeved on the outer side of the connecting piece, and a plurality of balls are mounted on the ball mounting seat. Each ball is sandwiched between the ball mounting seat and the mounting base and / or between the ball mounting seat and the mounting buckle seat and can roll.

[0012] Furthermore, each ball includes a first group of balls and a second group of balls, the first group of balls is installed at the top of the ball mounting seat for contacting the mounting buckle seat, and the second group of balls is installed at the bottom of the ball mounting seat for contacting the mounting base.

[0013] Furthermore, the mounting base has a third mounting cavity, and the connecting member is located in the third mounting cavity.

[0014] Furthermore, a self-locking mechanism is provided in the third mounting cavity, and the self-locking mechanism includes a first elastic member, a second elastic member, a limiting toothed disc and a shifting block. The third mounting cavity includes a first-layer mounting space and a second-layer mounting space, the second-layer mounting space is located above the first-layer mounting space, the first elastic member is located in the first-layer mounting space and is limited, the limiting toothed disc is fixedly connected to the mounting base and is located in the second-layer mounting space, the second elastic member is located in the second-layer mounting space and is limited in the limiting toothed disc, the shifting block includes a head and a tail, the head is located in the second-layer mounting space, and the tail extends downward from the head to the first-layer mounting space, and the mounting base is provided with a first limiting The tail portion is pressed against the first limiting structure by the first elastic member, an engaging structure is provided on the end of the head portion, a limiting wall and a plurality of teeth are provided on the limiting toothed disk, the engaging structure is engaged with each tooth on the limiting toothed disk, the connecting member is located above the head portion and is fixedly connected to the head portion, the limiting wall is used to block the head portion when the flipping portion rotates to the third position or the fourth position, and the second elastic member is used to provide an elastic force to the end of the head portion so that the engaging structure is stuck in one of the teeth of the limiting toothed disk when the flipping portion rotates to the third position or the fourth position, so as to prevent the flipping portion from rotating from the third position or the fourth position to the second position.

[0015] Further, the multiple teeth of the limiting toothed disk include multiple first teeth in a first direction and multiple second teeth in a second direction, the first direction is opposite to the second direction, the limiting wall includes a first limiting wall and a second limiting wall, the meshing structure includes a first meshing structure arranged at the first end of the head and a second meshing structure arranged at the second end of the head, and when the flipping part rotates to the third position, the first end of the head contacts the first limiting wall and one end of the second elastic member, and the first meshing structure is pressed into one of the first teeth by the second elastic member; when the flipping part rotates to the fourth position, the second end of the head contacts the second limiting wall and the other end of the second elastic member, and the second meshing structure is pressed into one of the second teeth by the second elastic member.

[0016] Furthermore, the self-locking mechanism also includes a block pin, which is fixed to the bottom of the connecting piece. The head is provided with a pin hole that cooperates with the block pin, and the block pin is inserted into the pin hole to fix the connecting piece and the head.

[0017] Furthermore, the flipping portion is hinged to the rotating portion via at least one hinge, and the flipping portion rotates synchronously with the hinge when flipping.

[0018] Further, the hinge includes a first hinge bracket, a second hinge bracket, two relatively arranged fixed blocks, a first hinge tooth, a second hinge tooth and a plurality of third hinge teeth, the first hinge tooth, the plurality of third hinge teeth and the second hinge tooth are all located between the two fixed blocks and meshed in sequence, the first hinge tooth is installed on the two fixed blocks via two first rotating shafts, the second hinge tooth is installed on the two fixed blocks via two second rotating shafts, the second hinge tooth is installed on the two fixed blocks via two second rotating shafts, each third hinge tooth is installed on the two fixed blocks via a third rotating shaft, the two sides of the first hinge bracket are respectively connected to the two first rotating shafts, the two sides of the second hinge bracket are respectively connected to the two second rotating shafts, the flip part is fixedly connected to the first hinge bracket, and the rotating part is fixedly connected to the second hinge bracket.

[0019] Furthermore, the first rotating shaft is fixedly connected to the first hinge tooth and the first hinge bracket, and is rotatably connected to the fixed block; the second rotating shaft is fixedly connected to the second hinge tooth and the second hinge bracket, and is rotatably connected to the fixed block; the third rotating shaft is fixedly connected to the third hinge tooth, and is rotatably connected to the fixed block.

[0020] Furthermore, the first rotating shaft and the second rotating shaft both include a first shaft segment, a second shaft segment and a third shaft segment which are arranged in sequence, and the diameters of the first shaft segment, the second shaft segment and the third shaft segment increase in sequence, the first shaft segment of the first rotating shaft is fixedly connected to the first hinge tooth, the second shaft segment of the first rotating shaft is rotatably connected to the fixed block, and the third shaft segment of the first rotating shaft is fixedly connected to the first hinge bracket; the first shaft segment of the second rotating shaft is fixedly connected to the second hinge tooth, the second shaft segment of the second rotating shaft is rotatably connected to the fixed block, and the third shaft segment of the second rotating shaft is fixedly connected to the second hinge bracket.

[0021] Further, the table top assembly further comprises a recess extending perpendicularly to the main plane, the recess being configured to accommodate an item;

[0022] The recess is fixedly connected to the rotating part, a second through hole is formed on the cover plate, the bottom of the recess passes through the second through hole and is connected to the rotating mechanism, and the rotating mechanism is configured to allow the recess to rotate around the second axis.

[0023] The armrest with a table top of the utility model has a flip portion that can first be flipped relative to the armrest body and the rotating portion to the outside of the armrest body, and then the flip portion and the rotating portion can be rotated from the outside to the inside to in front of the occupant, thereby avoiding interference with the occupant during the rotation process; the flip portion can be locked and unlocked in the third position and the fourth position through the self-locking mechanism, so that the flip portion can be used by the occupant in multiple positions, which is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1A It is a structural schematic diagram of an armrest with a table top according to an embodiment of the utility model when it is not unfolded;

[0025] Figure 1B for Figure 1A A schematic structural diagram of the armrest when the flipping portion is flipped to a second position relative to the rotating portion and the armrest body;

[0026] Figure 1C for Figure 1B A structural schematic diagram of the armrest when the flipping portion of the armrest rotates clockwise to a third position relative to the armrest body;

[0027] Figure 1D for Figure 1B A schematic structural diagram of the armrest when the flipping portion of the armrest rotates counterclockwise to a fourth position relative to the armrest body;

[0028] Figure 2 An exploded view of the table top assembly of the armrest according to an embodiment of the utility model;

[0029] Figure 3 This is a structural exploded view of an armrest with a table top according to an embodiment of the utility model;

[0030] Figure 4 It is a structural exploded view of the rotating mechanism according to an embodiment of the utility model;

[0031] Figure 5 It is a schematic diagram of the cross-section structure of the rotating mechanism according to an embodiment of the utility model;

[0032] Fig. 6A An exploded view of a connector, a locking mechanism and a mounting base according to an embodiment of the utility model;

[0033] Figure 6B It is a structural schematic diagram of a connecting member, a locking mechanism and a mounting base installed together according to an embodiment of the utility model;

[0034] Figure 6C for Figure 6B A schematic diagram of the structure after the connecting piece and the shifting block pin of the locking mechanism are removed;

[0035] Fig.6D for Figure 6C A schematic diagram of the structure after removing the shift block and the limit gear plate of the locking mechanism;

[0036] Fig. 6E It is a schematic diagram of the assembly of the connecting member and the shifting block pin according to an embodiment of the utility model;

[0037] Fig. 7AIt is a structural schematic diagram of the self-locking mechanism when the flip portion is located at the second position and the head of the shift block is in the first state according to an embodiment of the utility model;

[0038] Figure 7B It is a structural schematic diagram of the self-locking mechanism when the flip portion is located at the second position and the head of the shift block is in the second state according to an embodiment of the utility model;

[0039] Figure 7C It is a structural schematic diagram of the self-locking mechanism when the flip part according to the embodiment of the utility model is located at the third position;

[0040] Fig.7D It is a structural schematic diagram of the self-locking mechanism when the flip part according to the embodiment of the utility model is located at the fourth position;

[0041] Fig. 8A It is a structural schematic diagram of the first meshing structure of the head of the shift block disengaging from the first tooth when unlocking according to an embodiment of the utility model;

[0042] Figure 8B It is a structural schematic diagram of the first meshing structure of the head of the shift block being unlocked from the locking position and then being engaged in the adjacent first tooth when unlocking according to an embodiment of the utility model;

[0043] Fig. 9 It is a schematic diagram of the second elastic member and the shifting block in the process of the flip part rotating from the third position to the second position and from the second position to the fourth position according to an embodiment of the utility model;

[0044] Fig. 10A It is a structural schematic diagram of a hinge of an armrest with a table top according to an embodiment of the utility model;

[0045] Fig. 10B An exploded view of a hinge of an armrest with a table top according to an embodiment of the utility model;

[0046] Fig. 10C It is a structural schematic diagram of a hinge equipped with a first hinge cover and a second hinge cover according to an embodiment of the utility model;

[0047] Fig. 10D An exploded view of a hinge equipped with a first hinge cover and a second hinge cover according to an embodiment of the utility model;

[0048] Fig.11A is a schematic structural diagram of a first rotating shaft according to an embodiment of the utility model;

[0049] Fig. 11B An axial view of a first rotating shaft according to an embodiment of the utility model;

[0050] Fig. 11CA side view of a first hinge frame according to an embodiment of the utility model;

[0051] Fig. 12A It is a schematic diagram of the structure of the armrest according to the embodiment of the utility model after the turning part turns over an acute angle;

[0052] Fig. 12B This is a schematic diagram of the structure of the handrail after the turning portion is turned 90 degrees according to an embodiment of the utility model;

[0053] Fig. 12C It is a schematic diagram of the structure of the armrest according to the embodiment of the utility model after the turning part turns over an obtuse angle;

[0054] Fig.12D It is a schematic structural diagram of the armrest after being flipped 180 degrees at the flipping portion according to an embodiment of the utility model. DETAILED DESCRIPTION

[0055] The preferred embodiments of the present utility model are given below in conjunction with the accompanying drawings and described in detail.

[0056] like Figure 1A As shown, an embodiment of the utility model provides an armrest with a table top, including an armrest body 100 and a table top assembly, the table top assembly including a flipping part 200 and a rotating part 300, both of which are placed on the armrest body 100, the armrest body 100 defines a main plane (for example, it can be a plane parallel to the XY plane), the table top assembly defines a width direction (for example, a direction parallel to the Y axis), a first axis parallel to the width direction and a second axis perpendicular to the main plane (for example, the second axis can be parallel to the Z axis) are defined between the rotating part 300 and the flipping part 200, the flipping part 200 is hinged to the rotating part 300, and can be flipped between a first position and a second position around the first axis relative to the rotating part 300, the rotating part 300 is rotatably connected to the armrest body 100, so that the rotating part 300 drives the flipping part 200 to rotate between the second position and the third position and / or between the second position and the fourth position around the second axis relative to the armrest body 100.

[0057] In some embodiments, the table top assembly may further include a recess 400 extending perpendicularly to the main plane, and the recess 400 is used to accommodate items. For example, the recess 400 may be a cup holder for storing and holding a cup. The recess 400 may be located between the flip portion 200 and the rotating portion 300, and is fixedly connected to the rotating portion 300. The recess 400 is rotatably connected to the armrest body 100, so that the rotating portion 300 can rotate relative to the armrest body 100 around the second axis.

[0058] like Figure 1AAs shown, when the armrest is not unfolded, the flip portion 200, the rotating portion 300 and the recessed portion 400 are integrated with the armrest body 100 and used as an armrest. At this time, the flip portion 200 is located in the first position; Figure 1B As shown, when the table top needs to be used, the flip part 200 can be flipped upward 180 degrees around the first axis relative to the rotating part 300 and the armrest body 100 under the action of external force (such as the force applied by the passenger), so that the flip part 200 is located in the second position. At this time, the top surface of the flip part 200 contacts the top surface of the rotating part 300 and is suspended on the rotating part 300 through the hinge 500; Figure 1C As shown, after flipping, an external force can be continuously applied to the flip portion 200, so that the flip portion 200, the rotating portion 300 and the recessed portion 400 are rotated clockwise around the second axis relative to the armrest body 100 by a first angle (e.g., 90 degrees), so that the flip portion 200 is rotated from the second position to the third position. At this time, the flip portion 200 can be used by the occupant on the left side of the armrest. After use, the flip portion 200 can be rotated from the third position to the second position by an external force, and then flipped from the second position to the first position, so that the flip portion 200 and the rotating portion 300 form the upper layer of the armrest to support the arm of the occupant; as shown in FIG. Figure 1D As shown, when the flip part 200 is located at the second position, the flip part 200, the rotating part 300 and the recessed part 400 can also be rotated counterclockwise relative to the armrest body 100 by a second angle (for example, 90 degrees), so that the flip part 200 is rotated from the second position to the fourth position. At this time, the flip part 200 can be used by the occupant on the right side of the armrest. After use, the flip part 200 can be rotated from the fourth position to the second position by external force, and then flipped from the second position to the first position, so that the flip part 200 and the rotating part 300 form the upper layer of the armrest to support the occupant's arm.

[0059] It is understood that the flip part 200 can be set to rotate only from the second position to the third position clockwise for use by the occupant on the right side of the seat; or, it can only rotate counterclockwise from the second position to the fourth position for use by the occupant on the left side of the seat; or, it can rotate clockwise from the second position to the third position and counterclockwise from the second position to the fourth position for use by the occupants on both sides of the seat as needed. When the flip part 200 can rotate from the second position to the third position and from the second position to the fourth position, the flip part 200 can flip from the first position to the second position, and then rotate from the second position to the third position or the fourth position as needed for use by the occupants on different sides; it can also rotate directly from the third position to the fourth position (passing through the second position during the process) or from the fourth position to the third position (passing through the second position during the process), so that after the occupant on one side has used it, the occupant on the other side can use it.

[0060] In some embodiments, the recessed portion 400 has a accommodating cavity 410 with an opening at one end, and the accommodating cavity 410 can extend downward in a vertical direction. When the flip portion 200 is located in the first position, the opening of the accommodating cavity 410 is substantially flush with the flip portion 200 and the rotating portion 300, and the occupant can place objects such as cups into the accommodating cavity 410 through the opening to limit the objects.

[0061] In some embodiments, the flip part 200 can be hinged to the rotating part 300 through at least one hinge 500. The number of hinges 500 can be set as needed, for example, there can be two hinges, and the left and right sides of one end of the flip part 200 close to the rotating part 300 are respectively hinged to the rotating part 300 through a hinge 500, so that the flipping of the flip part 200 can be smoother.

[0062] like Figure 2 As shown, in some embodiments, the flip part 200 and the rotating part 300 can both be a double-layer structure, the flip part 200 includes a first bottom plate 210 and a first top plate 220, the rotating part 300 includes a second bottom plate 310 and a second top plate 320, the first bottom plate 210 is connected to one end of the hinge 500 (for example, by a screw 230), and the second bottom plate 310 is connected to the other end of the hinge 500 (for example, by a screw 230), so that the first bottom plate 210 and the second bottom plate 310 are hingedly connected through the hinge 500, and the first top plate 220 It is fixedly connected to the first base plate 210, the second top plate 320 is fixedly connected to the second base plate 310 (for example, by snap-fitting, screw connection or other connection methods), the recess 400 is fixed to the second base plate 310, and a first through hole 240 is formed between the flip part 200 and the rotating part 300 for the recess 400 to pass through, so that the top of the recess 400 is basically flush with the first top plate 210 and the second top plate 310, and the bottom of the recess 400 protrudes from the first base plate 210 and the second base plate 310, and extends into the armrest body 100.

[0063] like Figure 3 As shown, the armrest body 100 includes a base 110, a frame 120 and a cover plate 130 arranged in sequence from bottom to top, the frame 120 is fixed on the base 110, a rotating mechanism 600 is fixed on the frame 120, and the cover plate 130 is fixedly connected to the base 110 and covers the frame 120, so that the frame 120 and the rotating mechanism 600 are hidden between the base 110 and the cover plate 130; the cover plate 130 may be provided with a second through hole 131, the bottom of the recess 400 may pass through the second through hole 131 and be connected to the rotating mechanism 600, and the rotating mechanism 600 is used to rotate the recess 400 relative to the frame 120. In some embodiments, the table top assembly may not include the recess 400, in which case the rotating mechanism 600 is directly connected to the rotating part 300, and the rotating mechanism 600 is used to rotate the rotating part 300 relative to the frame 120.

[0064] In some embodiments, a third through hole 121 is defined on the frame 120 , a first installation cavity 111 is defined on the base 110 , and the bottom of the rotating mechanism 600 can pass through the third through hole 121 and be located in the first installation cavity 111 .

[0065] In some embodiments, the base 110 may be made of foam, plastic, wood, metal, or a combination thereof to provide support and decoration.

[0066] like Figure 4 As shown, in some embodiments, the rotating mechanism 600 includes a mounting base 610, a mounting buckle seat 620 and a connecting member 630. The mounting base 610 is fixed on the frame 120, and the mounting buckle seat 620 is fixed to the mounting base 610. For example, the mounting buckle seat 620, the mounting base 610 and the frame 120 can be fixedly connected by screws 660; the connecting member 630 is clamped between the mounting base 610 and the mounting buckle seat 620, and can slide relative to the mounting base 610 and the mounting buckle seat 620, so that the connecting member 630 can rotate around its own axis between the mounting base 610 and the mounting buckle seat 620, and the recess 400 is fixedly connected to the connecting member 630, so that the recess 400 can rotate relative to the armrest body 100. Similarly, when the table board assembly does not include the recess 400, the connecting member 630 can be directly fixedly connected to the rotating part 300.

[0067] In some embodiments, the recess 400 can be opened by screws 420 (such as Figure 3 As shown) is fixedly connected to the connecting piece 630.

[0068] In some embodiments, the connector 630 has a second mounting cavity 631 , the bottom of the recess 400 may be located in the second mounting cavity 631 , and the bottom of the recess 400 and the bottom of the connector 630 are fixed by screws 420 .

[0069] In some embodiments, a ball mounting seat 640 is provided on the outer side of the connecting member 630, and a plurality of balls 650 are mounted on the ball mounting seat 640. Each ball 650 is clamped between the ball mounting seat 640 and the mounting base 610 and / or the mounting buckle seat 620 and can roll. When the flip part 200 is subjected to an external force that causes it to rotate, the rotating part 300 and the recessed part 400 are also subjected to the same external force. The external force is transmitted to the connecting member 630 through the recessed part 400, causing the connecting member 630 to rotate around its own axis between the mounting base 610 and the mounting buckle seat 620. During the rotation process, each ball 650 contacts the ball mounting seat 640, the mounting base 610 and / or the mounting buckle seat 620, and rolls, so that the friction between the connecting member 630 and the mounting base and the mounting buckle seat 620 is rolling friction, and the rotation is smoother.

[0070] In some embodiments, a plurality of ball grooves 641 may be provided on the ball mounting seat 640 , and each ball 650 is mounted in a ball groove 641 and can roll in the ball groove 641 .

[0071] In some embodiments, each ball 650 includes two groups, wherein the first group of balls is mounted on the top of the ball mounting seat 640 for contacting the mounting buckle seat 620, and the second group of balls is mounted on the bottom of the ball mounting seat 640 for contacting the mounting base 610. In this way, the ball mounting seat 640 can be rollingly connected to the mounting buckle seat 620 and the mounting base 610, with less friction and smoother rotation.

[0072] like Figure 5 As shown, after the connecting member 630 is installed between the mounting base 610 and the mounting buckle seat 620, a space is formed between the ball mounting seat 640 and the mounting buckle seat 620 and between the ball mounting seat 640 and the mounting base 610, which serve as rolling spaces (or rolling tracks) for the first group of balls and the second group of balls respectively. During the rotation of the flipping part 200, the first group of balls and the second group of balls roll in their respective rolling tracks.

[0073] In some embodiments, the mounting base 610 has a third mounting cavity 611 (eg, Figure 4 As shown in FIG. 6 , the connecting member 630 is located in the third installation cavity 611. Figure 3 As shown, the top of the mounting base 610 is fixedly connected to the frame 120 , and the bottom passes through the third through hole 121 and is located in the first mounting cavity 111 .

[0074] like Fig. 6A , Figure 6B , Figure 6C and Fig.6DAs shown, a self-locking mechanism 700 is further provided in the third installation cavity 611 of the installation base 610, and the self-locking mechanism 700 includes a first elastic member 710, a second elastic member 720, a limiting toothed disc 730 and a shifting block 740. The third installation cavity 611 includes a first-layer installation space and a second-layer installation space, the second-layer installation space is located above the first-layer installation space, the first elastic member 710 is located in the first-layer installation space and is limited below the limiting toothed disc 730, and the limiting toothed disc 730 is fixedly connected to the installation base 610 and is located in the second-layer installation space. The second elastic member 720 is located in the second installation space and is limited in the limiting toothed disk 730. The shift block 740 includes a head 741 and a tail 742. The head 741 is located in the second installation space, and the tail 742 extends downward from the head 741 to the first installation space. The mounting base 610 is provided with a first limiting structure 612. The tail 742 is pressed against the first limiting structure 612 by the first elastic member 710. An engaging structure is provided at the end of the head 741. The limiting toothed disk 730 is provided with a plurality of teeth. The engaging structure and the limiting teeth are engaged with each other. The teeth of the disc 730 mesh with each other, the connecting member 630 is located above the head 741 and is fixedly connected to the head 741. A limiting wall is provided on the limiting toothed disc 730. When the flip part 200 is rotated relative to the armrest body 100 by an external force, the connecting member 630 will also rotate around its own axis under the action of the external force, so that the meshing structure of the head 741 of the shift block 740 meshes with the teeth of the limiting toothed disc 730, so that the head 741 rotates in the limiting toothed disc 730, and the tail 742 will also slide relative to the first limiting structure 612. When the part 200 rotates to the third position or the fourth position under the action of external force, the end of the head 741 will compress the second elastic member 720 and abut against the limiting wall of the limiting toothed disk 730, and the limiting wall will limit it to prevent it from further rotating and stop it at the third position or the fourth position. At the same time, the second elastic member 720 will provide an elastic force to the end of the head 741, so that the meshing structure of the head 741 is stuck in the teeth to prevent the flipping part 200 from rotating in the opposite direction (i.e., rotating from the third position or the fourth position to the second position), thereby achieving locking.

[0075] In some embodiments, a second limiting structure 613 may be provided on the mounting base 610, and the first limiting structure 612 and the second limiting structure 613 jointly limit the second elastic member 720. When the flip part 200 is not in the third position and the fourth position, the end of the head 741 is away from the second elastic member 720. When the flip part 200 rotates to the third position or the fourth position, the end of the head 741 moves to contact the limiting wall of the limiting toothed disk 730 and compress the second elastic member 720, so that it is limited by the limiting wall, and the second elastic member 720 then inserts the meshing structure into the teeth of the limiting toothed disk 730 to achieve locking.

[0076] In some embodiments, the plurality of teeth of the limiting toothed disk 730 include a plurality of first teeth 731 in a first direction and a plurality of second teeth 732 in a second direction, wherein the first direction is opposite to the second direction, the limiting wall includes a first limiting wall 733 and a second limiting wall 734, and the meshing structure of the head 741 includes a first meshing structure 744 and a second meshing structure 745, which are respectively located at a first end and a second end of the head 741, and when the flip portion 200 rotates to the third position, the first end of the head 741 abuts against the first limiting wall 733 and abuts against the second elastic member 7 20, to compress the second elastic member 720, and the second elastic member 720 then clamps the first meshing structure 744 into one of the first teeth 731 to prevent the flip part 200 from rotating toward the second position; when the flip part 200 rotates to the fourth position, the second end of the head 742 abuts against the first limiting wall 733 and contacts the other end of the second elastic member 720 to compress the second elastic member 720, and the second elastic member 720 clamps the second meshing structure 744 into one of the second teeth 732 to prevent the flip part 200 from rotating toward the second position. Due to the elastic force of the second elastic member 720, the meshing structure can be tightly clamped in the teeth to eliminate the gap between the two, so that the flip part 200 will not shake and will be more stable.

[0077] In some embodiments, the head 741 of the shift block 740 is airplane-shaped, and the tail 742 is circular, and the head 741 and the tail 742 are connected by a vertical plate, so that the head 741 and the tail 742 are not in the same plane and are parallel to each other; the outer side surface of the middle part 743 of the head 741 is formed as an arc, and claws are provided at both ends of the head 741, which serve as a first meshing structure 744 and a second meshing structure 745, respectively, for meshing with the teeth of the limiting toothed disk 730; during the rotation of the flipping part 200 (except the third position and the fourth position), only the first meshing structure 744 or the second meshing structure 745 of the head 741 meshes with the teeth of the limiting toothed disk 730, and the rest of the parts do not contact the limiting toothed disk 730, maintaining a certain gap to avoid friction between the rest of the parts and the limiting toothed disk 730 and causing noise.

[0078] like Fig. 6E As shown, in some embodiments, the self-locking mechanism 700 also includes a shift pin 750, which is fixed to the bottom of the connecting member 630 (for example, it can be fixed in the groove 632 of the connecting member 630), and the head 741 is provided with a pin hole 746 that cooperates with the shift pin 750. The shift pin 750 can be inserted into the pin hole 746 to achieve a fixed connection between the connecting member 630 and the head 741.

[0079] When the flip portion 200 is located at the second position, the head portion 741 may have two states. The first state is as follows: Fig. 7AAs shown, the head 741 is located on the side where the first elastic member 710 is located and away from the second elastic member 720. The first meshing structure 744 is meshed with the first tooth 731, and the second meshing structure 745 is not in contact with the limiting toothed disc 730 and is in a suspended state. Figure 7B As shown, the head 741 is located on the side where the first elastic member 710 is located and away from the second elastic member 720. The second meshing structure 745 meshes with the second tooth 732, and the first meshing structure 744 does not contact the limiting toothed disk 730 and is in a suspended state. When the flip part 200 needs to be rotated from the second position to the third position, if the head 741 is in the second state, it is necessary to first apply an external force to rotate the head 741 clockwise, so that the head 741 changes from the second state to the first state, and then continue to apply an external force to rotate it clockwise, so that the head 741 rotates clockwise on the limiting toothed disk 730 until the first end of the head 741 contacts the first limiting wall 733 and the second elastic member 720. The head 741 will no longer rotate clockwise due to the obstruction of the first limiting wall 733, and the second elastic member 720 presses the first meshing structure 744 into the first tooth 731, so that the head 741 cannot rotate counterclockwise, and locking is achieved, as shown in FIG. Figure 7C When the flip part 200 needs to be rotated from the second position to the fourth position, if the head is in the first state, an external force is first applied to rotate the head 741 counterclockwise, so that the head 751 changes from the first state to the second state, and then the external force is continued to be applied to rotate it counterclockwise, so that the head 741 rotates counterclockwise on the limiting toothed disc 730 until the second end of the head 741 contacts the second limiting wall 734 and the other end of the second elastic member 720. The head 741 will no longer rotate counterclockwise due to the obstruction of the second limiting wall 734, and the second elastic member 720 presses the second meshing structure 745 into the second tooth 732, so that the head 741 cannot rotate clockwise, thereby achieving locking, as shown in FIG. Fig.7D shown.

[0080] After the flip part 200 is locked in the third position or the fourth position, if the flip part 200 needs to be rotated back to the second position, it needs to be unlocked first. Taking the flip part 200 locked in the third position as an example, if it is to be unlocked, it is necessary to provide an external force to the flip part 200 to rotate it counterclockwise. When the external force is greater than the sum of the locking force between the first meshing structure 744 and the first tooth 731 and the elastic force provided by the second elastic member 720, the tail 742 of the shifting block 740 will rotate clockwise on the first limiting structure 612, so that the first end of the head 741 will also rotate clockwise by a certain angle, so that the first meshing structure 744 will be disengaged from the first tooth 731, as shown in FIG. Fig. 8AAs shown, unlocking can be achieved; then under the action of external force, the head 741 will rotate counterclockwise, the tail 742 will also rotate counterclockwise on the first limiting structure 612, and the first meshing structure 744 will rotate a certain angle and then snap into the adjacent first tooth 731, such as Figure 8B As shown; then under the action of external force, the first meshing structure 744 will disengage from the adjacent first tooth 731 and continue to rotate counterclockwise, and repeat the above process, so that the flip part 200 can rotate from the third position to the second position. The principle of unlocking and rotating from the fourth position to the second position is similar to the principle of unlocking and rotating from the third position to the second position, and will not be repeated here.

[0081] like Fig. 9 As shown in the figure, the first elastic member 710 with a dotted line represents the compressed state of the first elastic member 710 when the flip part 200 flips from the first position to the second position, and the first elastic member 710 with a solid line represents the actual compressed state of the first elastic member 710 during the process of the flip part 200 rotating between the third position and the fourth position. Fig. 9 It can be seen that when the flip part 200 flips from the third position to the second position under the action of external force, and continues to rotate from the second position to the fourth position, the compression state of the first elastic member 710 and the position of the shift block 740 will change, and when in the second position, the head 741 will switch from the first state to the second state under the action of external force.

[0082] In some embodiments, a first observation hole 747 is provided on the tail 742 of the shift block 740, and a second observation hole 614 is provided on the mounting base 610. The second observation hole 614 and the first observation hole 747 are interconnected. Through the second observation hole 614 and the first observation hole 747, it can be observed whether the position of the shift block deviates during the rotation process, thereby determining whether it is assembled in place.

[0083] like Fig. 10A and Fig. 10BAs shown, in some embodiments, the hinge 500 may include a first hinge bracket 510, a second hinge bracket 520, two opposite fixed blocks 530, a first hinge tooth 540, a second hinge tooth 550 and a plurality of third hinge teeth 560, the first hinge tooth 540, the plurality of third hinge teeth 560 and the second hinge tooth 550 are all located between the two fixed blocks 530 and meshed in sequence; the first hinge tooth 540 is mounted on the two fixed blocks 530 through two first rotating shafts 570, the second hinge tooth 550 is mounted on the two fixed blocks 530 through two second rotating shafts 580, each third hinge tooth 560 is mounted on the two fixed blocks 530 through a third rotating shaft 590, both sides of the first hinge bracket 510 are respectively connected to the two first rotating shafts 570, both sides of the second hinge bracket 520 are respectively connected to the two second rotating shafts 580, the flip part 200 is fixedly connected to the first hinge bracket 510, and the rotating part 300 is fixedly connected to the second hinge bracket 520.

[0084] Specifically, the first rotating shaft 570 can be fixedly connected to the first hinge tooth 540 and the first hinge bracket 510, and the first rotating shaft 570 is rotatably connected to the fixed block 530, so that the first rotating shaft 570, the first hinge tooth 540 and the first hinge bracket 510 can rotate together relative to the fixed block 530 around the axial direction of the first rotating shaft 570; the second rotating shaft 580 can be fixedly connected to the second hinge tooth 550 and the second hinge bracket 520, and the second rotating shaft 580 is rotatably connected to the fixed block 530, so that the second rotating shaft 580, the second hinge tooth 550 and the second hinge bracket 520 can rotate together relative to the fixed block 530 around the axial direction of the first rotating shaft 570. The sprocket 540 and the second hinge bracket 520 can rotate together relative to the fixed block 530 around the axial direction of the second rotating shaft 580; the third rotating shaft 590 passes through one of the fixed blocks 530, the third hinge tooth 560 and the other fixed block 530 in sequence, so that the third hinge tooth 560 is installed on the two fixed blocks 530, the third rotating shaft 590 is fixedly connected to the third hinge tooth 560, and the third rotating shaft 590 is rotatably connected to the two fixed blocks 530, that is, the third rotating shaft 590 can rotate around its own axial direction relative to the two fixed blocks 530. During the flipping process, the flipping part 200 flips upward under the action of external force (for example, external force applied by the occupant), causing the first hinge bracket 510, the first hinge tooth 540 and the first rotating shaft 570 to rotate relative to the fixed block 530. The rotation of the first hinge tooth 540 is transmitted to the third hinge tooth 560 meshing therewith, and is in turn transmitted to the third hinge tooth 560 meshing with the second hinge tooth 550. Since the second hinge bracket 520 is fixed to the rotating part 300, the second hinge bracket 520, the second hinge tooth 540 and the second rotating shaft 580 all remain stationary. Driven by the third hinge tooth 560 meshing with the second hinge tooth 550, the first hinge tooth 540, the fixed block 530 and each third hinge tooth 560 will rotate around the second rotating shaft 580 relative to the second hinge bracket 520, thereby realizing the synchronous rotation of the flipping part 200 and the hinge 500.

[0085] like Fig. 10C and Fig. 10D As shown, the outer side of the hinge 500 may be provided with a first hinge cover 810 and a second hinge cover 820, the first hinge cover 810 and the second hinge cover 820 are connected to each other, and a space for accommodating the first hinge tooth 540, the two fixing blocks 530, the second hinge tooth 550, and each third hinge 560 is formed therebetween, so that the first hinge tooth 540, the two fixing blocks 530, the second hinge tooth 550, and each third hinge 560 are covered by the first hinge cover 810 and the second hinge cover 820 to play a protective role.

[0086] like Fig.11A , Fig. 11B and Fig. 11C As shown, in some embodiments, the first rotating shaft 570 may include a first shaft segment 571, a second shaft segment 572 and a third shaft segment 573 which are arranged in sequence, the diameters of the first shaft segment 571, the second shaft segment 572 and the third shaft segment 573 increase in sequence, the first shaft segment 571 and the third shaft segment 573 are both square shafts, the second shaft segment 572 is a circular shaft, the first hinge bracket 510 is provided with a first square hole 511 which is adapted to the third shaft segment 573, the first hinge tooth 540 is provided with a second square hole which is adapted to the first shaft segment 571, so that the first hinge bracket 510 is fixedly connected to the third shaft segment 573, the first hinge tooth 540 is fixedly connected to the first shaft segment, and the fixed block 330 is provided with a circular hole for the second shaft segment 572 to pass through, so that the fixed block 530 is rotatably connected to the second shaft segment 572. During installation, the first shaft section 571 and the second shaft section 572 both pass through the circular hole on the fixing block 530, and the first shaft section 571 is fixedly connected to the first hinge tooth 540, the second shaft section 572 is partially located in the circular hole, and the third shaft section 573 is located outside the fixing block 530 and in the first square hole 511, thereby being fixedly connected to the first hinge bracket 510. In this way, the first rotating shaft 570 can be fixedly connected to the first hinge tooth 540 and the first hinge bracket 510, and rotatably connected to the fixing block 530.

[0087] The structure of the second rotating shaft 580 is the same as that of the first rotating shaft 570, and the connection method between it and the second hinge bracket 520, the second hinge tooth 550, and the fixed block 530 is also the same as the connection relationship between the first rotating shaft 570 and the first hinge bracket 510, the first hinge tooth 540 and the fixed block 530, which will not be repeated here.

[0088] The number of the third hinge teeth 560 is an even number, and the specific number can be set as required, for example, it can be two, four or more.

[0089] In an exemplary embodiment, the number of the third hinge teeth 560 , the number of the first rotating shaft 570 , and the number of the second rotating shaft 580 are all two.

[0090] like Fig. 12A , Fig. 12B , Fig. 12C and Fig.12D As shown, during the process of the flipping part 200 flipping from the first position to the second position, the rotation of the flipping part 200 causes the hinge 500 to rotate as a whole relative to the rotating part 300, thereby realizing synchronous rotation of the two, and the rotation angle of the hinge 500 is half of the rotation angle of the flipping part 200, that is, when the flipping part 200 rotates 180 degrees, the hinge 500 rotates 90 degrees. Since the hinge 500 and the flipping part 200 always move synchronously during the folding process of the flipping part 200, the gap between the flipping part 200 and the hinge 500 is uniform, so that the flipping part 200 will not shake and is more stable.

[0091] In the armrest with a table top in the embodiment of the utility model, the flip part 200 can first be flipped relative to the armrest body 100 and the rotating part 300 to the outside of the armrest body 100, and then the flip part 200 and the rotating part 300 can be rotated from the outside to the inside to the front of the occupant, so as to avoid interference with the occupant during the rotation process; the flip part 200 can be locked and unlocked in the third position and the fourth position through the self-locking mechanism 700, so that the flip part 200 can be used by the occupant in multiple positions, which is more convenient.

[0092] It should be noted that the utility model (e.g., utility model concepts, etc.) has been described in the specification of this patent document and / or illustrated in the drawings according to exemplary embodiments; the embodiments of the utility model are presented only by way of example and are not intended to limit the scope of the utility model. The structure and / or arrangement of the elements of the utility model concepts embodied in the utility model as described in the specification and / or illustrated in the drawings are merely illustrative. Although exemplary embodiments of the utility model have been described in detail in this patent document, it is easy for a person of ordinary skill in the art to understand that equivalents, modifications, variations, etc. of the subject matter of the exemplary embodiments and alternative embodiments are possible and are considered to be within the scope of the utility model; all of these subject matters (e.g., modifications, variations, embodiments, combinations, equivalents, etc.) are intended to be included within the scope of the utility model. It should also be noted that various / other modifications, changes, substitutions, equivalents, changes, omissions, etc. can be made in the configuration and / or arrangement of the exemplary embodiments (e.g., in terms of concepts, designs, structures, devices, forms, assemblies, constructions, means, functions, systems, processes / methods, steps, the order of process / method steps, operations, operating conditions, performances, materials, compositions, combinations, etc.) without departing from the scope of the present invention; all of these subjects (e.g., modifications, changes, embodiments, combinations, equivalents, etc.) are intended to be included within the scope of the present invention. The scope of the present invention is not intended to be limited to the subject matter described in the specification and / or drawings of this patent document (e.g., details, structures, functions, materials, behaviors, steps, sequences, systems, results, etc.). Considering that the claims of this patent document will be appropriately interpreted as covering the full scope of the subject matter of the present invention (e.g., including any and all such modifications, changes, embodiments, combinations, equivalents, etc.); it should be understood that the terms used in this patent document are intended to provide a description of the subject matter of the exemplary embodiments, rather than as a limitation on the scope of the present invention.

[0093] It should also be noted that, according to the exemplary embodiments, the present invention may include conventional technologies (such as technologies implemented and / or integrated in the exemplary embodiments, modifications, changes, combinations, equivalents), or may include any other applicable technologies (now and / or in the future) with the ability to perform the functions and processes / operations described in the specification and / or illustrated in the figures. All of these technologies (such as technologies implemented in embodiments, modifications, changes, combinations, equivalents, etc.) are considered to be within the scope of the present invention of this patent document.

Claims

1. An armrest with a table top, characterized in that: The armrest comprises an armrest body and a table top assembly, wherein the table top assembly comprises a rotating portion and a flipping portion, the armrest body defines a main plane, the table top assembly defines a width direction, and a first axis parallel to the width direction and a second axis perpendicular to the main plane are defined between the rotating portion and the flipping portion; The flipping portion is configured to flip between a first position and a second position around the first axis relative to the rotating portion, and the rotating portion is configured to drive the flipping portion to rotate between the second position and a third position and / or between the second position and a fourth position around the second axis relative to the armrest body.

2. The armrest with table top according to claim 1, characterized in that: The flip part is hinged to the rotating part through at least one hinge, the flip part includes a first bottom plate and a first top plate, the rotating part includes a second bottom plate and a second top plate, the first bottom plate is fixedly connected to one end of the hinge, the second bottom plate is fixedly connected to the other end of the hinge, the first top plate is fixedly connected to the first bottom plate, and the second top plate is fixedly connected to the second bottom plate.

3. The armrest with table top according to claim 1, characterized in that: The armrest body includes a base, a frame and a cover plate which are arranged in sequence from bottom to top. The frame is fixed on the base, a rotating mechanism is fixed on the frame, the cover plate is fixedly connected to the base and covers the frame; the rotating part is connected to the rotating mechanism, and the rotating mechanism is used to rotate the rotating part relative to the frame.

4. The armrest with table top according to claim 3, characterized in that: The frame is provided with a third through hole, the base is provided with a first installation cavity, and the bottom of the rotating mechanism passes through the third through hole and is located in the first installation cavity.

5. The armrest with table top according to claim 3, characterized in that: The rotating mechanism includes a mounting base, a mounting buckle seat and a connecting piece, the mounting base is fixed on the frame, the mounting buckle seat is fixed to the mounting base, the connecting piece is clamped between the mounting base and the mounting buckle seat and can slide relative to the mounting base and the mounting buckle seat, and the rotating part is fixedly connected to the connecting piece.

6. The armrest with table top according to claim 5, characterized in that: The outer side of the connecting piece is sleeved with a ball mounting seat, on which a plurality of balls are mounted. Each ball is sandwiched between the ball mounting seat and the mounting base and / or between the ball mounting seat and the mounting buckle seat and can roll.

7. The armrest with table top according to claim 6, characterized in that: Each ball includes a first group of balls and a second group of balls. The first group of balls is installed at the top end of the ball mounting seat for contacting the mounting buckle seat, and the second group of balls is installed at the bottom end of the ball mounting seat for contacting the mounting base.

8. The armrest with table top according to claim 5, characterized in that: The mounting base has a third mounting cavity, and the connecting member is located in the third mounting cavity.

9. The armrest with table top according to claim 8, characterized in that: A self-locking mechanism is provided in the third installation cavity, and the self-locking mechanism includes a first elastic member, a second elastic member, a limiting toothed disc and a shift block. The third installation cavity includes a first-layer installation space and a second-layer installation space. The second-layer installation space is located above the first-layer installation space. The first elastic member is located in the first-layer installation space and is limited. The limiting toothed disc is fixedly connected to the installation base and is located in the second-layer installation space. The second elastic member is located in the second-layer installation space and is limited in the limiting toothed disc. The shift block includes a head and a tail. The head is located in the second-layer installation space, and the tail extends downward from the head to the first-layer installation space. The first limiting mechanism is provided on the installation base. The tail portion is pressed against the first limiting structure by the first elastic member, an engaging structure is provided on the end of the head portion, a limiting wall and a plurality of teeth are provided on the limiting toothed disk, the engaging structure is engaged with each tooth on the limiting toothed disk, the connecting member is located above the head portion and is fixedly connected to the head portion, the limiting wall is used to block the head portion when the flip portion rotates to the third position or the fourth position, and the second elastic member is used to provide an elastic force to the end of the head portion so that the engaging structure is stuck in one of the teeth of the limiting toothed disk when the flip portion rotates to the third position or the fourth position, so as to prevent the flip portion from rotating from the third position or the fourth position to the second position.

10. The armrest with table top according to claim 9, characterized in that: The plurality of teeth of the limiting toothed disc include a plurality of first teeth in a first direction and a plurality of second teeth in a second direction, the first direction and the second direction are opposite, the limiting wall includes a first limiting wall and a second limiting wall, the meshing structure includes a first meshing structure provided at a first end of the head and a second meshing structure provided at a second end of the head, when the flip portion rotates to the third position, the first end of the head contacts the first limiting wall and one end of the second elastic member, and the first meshing structure is pressed into one of the first teeth by the second elastic member; When the flip portion rotates to the fourth position, the second end of the head contacts the second limiting wall and the other end of the second elastic member, and the second meshing structure is pressed into one of the second teeth by the second elastic member.

11. The armrest with table top according to claim 9, characterized in that: The self-locking mechanism also includes a block pin, which is fixed to the bottom of the connecting member. The head is provided with a pin hole that cooperates with the block pin. The block pin is inserted into the pin hole to fix the connecting member and the head.

12. The armrest with table top according to claim 1, characterized in that: The flipping part is hinged to the rotating part through at least one hinge, and the flipping part rotates synchronously with the hinge when flipping.

13. The armrest with table top according to claim 12, characterized in that: The hinge includes a first hinge bracket, a second hinge bracket, two relatively arranged fixed blocks, a first hinge tooth, a second hinge tooth and a plurality of third hinge teeth. The first hinge tooth, the plurality of third hinge teeth and the second hinge tooth are all located between the two fixed blocks and meshed in sequence. The first hinge tooth is installed on the two fixed blocks through two first rotating shafts, the second hinge tooth is installed on the two fixed blocks through two second rotating shafts, the second hinge tooth is installed on the two fixed blocks through two second rotating shafts, and each third hinge tooth is installed on the two fixed blocks through a third rotating shaft. The two sides of the first hinge bracket are respectively connected to the two first rotating shafts, and the two sides of the second hinge bracket are respectively connected to the two second rotating shafts. The flip part is fixedly connected to the first hinge bracket, and the rotating part is fixedly connected to the second hinge bracket.

14. The armrest with table top according to claim 13, characterized in that: The first rotating shaft is fixedly connected to the first hinge tooth and the first hinge bracket, and is rotatably connected to the fixed block; the second rotating shaft is fixedly connected to the second hinge tooth and the second hinge bracket, and is rotatably connected to the fixed block; the third rotating shaft is fixedly connected to the third hinge tooth, and is rotatably connected to the fixed block.

15. The armrest with table top according to claim 14, characterized in that: The first rotating shaft and the second rotating shaft both include a first shaft segment, a second shaft segment and a third shaft segment which are arranged in sequence, and the diameters of the first shaft segment, the second shaft segment and the third shaft segment increase in sequence, the first shaft segment of the first rotating shaft is fixedly connected to the first hinge tooth, the second shaft segment of the first rotating shaft is rotatably connected to the fixed block, and the third shaft segment of the first rotating shaft is fixedly connected to the first hinge bracket; the first shaft segment of the second rotating shaft is fixedly connected to the second hinge tooth, the second shaft segment of the second rotating shaft is rotatably connected to the fixed block, and the third shaft segment of the second rotating shaft is fixedly connected to the second hinge bracket.

16. The armrest with table top according to claim 3, characterized in that: The table top assembly further includes a recess extending perpendicular to the main plane, the recess being configured to accommodate an item; The recess is fixedly connected to the rotating part, a second through hole is formed on the cover plate, the bottom of the recess passes through the second through hole and is connected to the rotating mechanism, and the rotating mechanism is configured to allow the recess to rotate around the second axis.

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