CN220349539U

CN220349539U - Locking device for armrest of vehicle seat

Info

Publication number: CN220349539U
Application number: CN202322057990.XU
Authority: CN
Inventors: 邹耀忠; 杨广
Original assignee: Jiangsu Zhongming Xianghe Seiko Co ltd
Current assignee: Jiangsu Zhongming Xianghe Seiko Co ltd
Priority date: 2023-08-02
Filing date: 2023-08-02
Publication date: 2024-01-16
Anticipated expiration: 2033-08-02

Abstract

A vehicle seat armrest locking device comprising: a positioning shaft for connection to the armrest mounting base; the rotating frame body comprises two rotating support plates and a connecting shaft, and is used for being connected to the armrest framework and capable of rotating together with the armrest; the clamping circular sleeve is sleeved on the positioning shaft, and a clamping circular sleeve tooth line part is formed on the clamping circular sleeve; the middle locking piece is arranged at one side of the clamping round sleeve, and a tooth line part of the middle locking piece is formed on the middle locking piece; the locking block is pivoted on the connecting shaft, can be abutted and fixed with the middle locking piece, and can rotate around the connecting shaft in the vertical surfaces of the two rotary support plates and drive the middle locking piece to rotate so as to be separated from locking connection with the clamping round sleeve; the elastic element is sleeved on the connecting shaft, one end of the elastic element is embedded on the rotating support plate, and the other end of the elastic element is hooked to the locking block and can apply acting force to the locking block. The advantages are that: compact structure, good locking effect, reliable and stable use, strong shock resistance, convenient installation, cost saving and improved use comfort.

Description

Locking device for armrest of vehicle seat

Technical Field

The utility model belongs to the technical field of automobile parts, and particularly relates to a locking device for a vehicle seat armrest.

Background

The above-mentioned vehicle seat armrest belongs to a functional accessory, is generally configured at a side portion of a seat and has a rotatable function for supporting passengers to improve riding comfort, and generally, the vehicle seat armrest is used in some commercial vehicles such as buses, long-distance buses or business vehicles, people can choose to put down the armrest according to actual requirements so as to block body side movement and support hands, and can also choose to turn over the armrest upwards so as to increase space at the side surface of the seat and facilitate passengers to get in and out. Of course, the vehicle seat armrests are also arranged in the middle of the rear seats of some passenger vehicles, and when the rear seats only need to sit for 1 to 2 persons, the middle armrests are put down, so that better riding experience can be obtained. At present, the vehicle seat armrest in the prior art realizes the locking through assembling the telescopic high-strength stop pin, and the locking pin is located the pivot position of central armrest particularly to the locking is realized by the cooperation of the hole site on the inside locking pin that stretches out of armrest and the external mounting support, guarantees to keep the armrest to be in the locking position all the time under certain impact force effect and does not receive the interference. However, the locking structure is influenced by manufacturing precision and assembly precision, the locking pin has larger shaking amount, and the handrail still shakes after locking, so that the use experience is greatly influenced; in addition, the locking mechanism inside the handrail generally has the problems of large occupied space and difficult maintenance.

To improve this situation, the relevant manufacturers have made beneficial attempts; the prior art patent literature is also not deficient in the information about such armrests and related armrest locking mechanisms, and includes: CN219339268U (a center armrest of a rear seat of an automobile and an automobile), CN115649029a (a turnover armrest of an automobile), CN204774782U (a middle armrest locking structure of a rear seat of an automobile), CN219154309U (a locking mechanism, an armrest locking device and an armrest assembly), and the like; the typical "a handrail locking mechanism" as disclosed in the publication CN218316380U, including a locking block, a middle block, a fixed block and a locking shaft, where the fixed block is fixed on the rotating shaft, the outer ring of the fixed block is provided with a groove, two ends of the groove are respectively a first inclined plane and a second inclined plane, the middle block is mounted on the handrail side plate through the first shaft, the locking block is mounted on the handrail side plate through the second shaft, the locking block is provided with an arc surface towards the middle block, the arc surface contacts with one side of the middle block, the spring is mounted on the second shaft, one end of the spring is mounted on the handrail bottom plate, the other end of the spring is disposed on the inclined plane of the spring mounting groove, one side of the middle block is provided with a buckle, and when in the locking position, the buckle of the middle block is clamped at the upper end of the inclined plane of the groove, and has the advantages of simple structure and easy maintenance; however, the following problems still remain: firstly, when the locking position is located, the buckle of the middle block is clamped at the upper end of the inclined plane of the groove, however, when the buckle and groove matching connection structure is impacted by external force or jolt, the problem of sliding release easily occurs, the condition of shaking the handrail is caused, the subsequent riding experience is affected, the locking effect is poor, and the shock resistance is poor; and the locking piece, the intermediate block and the fixed block are all installed on one side of the handrail side plate, so that the locking piece, the intermediate block and the fixed block are exposed outside and are easily damaged due to interference of external factors, and the use safety cannot be guaranteed.

In view of the above prior art, the applicant has devised an advantageous design and the technical solutions described below are created in this context.

Disclosure of Invention

The utility model aims to provide the vehicle seat armrest locking device which has the advantages of compact structure, good locking effect, reliable and stable use, strong shock resistance, convenient installation and cost saving, is beneficial to improving the comfort of use by eliminating the shaking gap, and can improve the safety and stability of use by optimizing the internal structure.

The object of the utility model is achieved by a vehicle seat armrest locking device comprising: a positioning shaft for connecting to the armrest mounting base; the rotating frame body comprises two rotating support plates and a connecting shaft, wherein the rotating support plates are arranged at intervals, the rotating frame body is used for being connected to the handrail framework and can rotate together with the handrail, the two rotating support plates are movably sleeved on the shaft body of the positioning shaft and are in rotating connection with the positioning shaft, and the connecting shaft is fixedly arranged between one end parts of the two rotating support plates in the length direction; the clamping circular sleeve is arranged between the two rotating support plates and detachably and fixedly sleeved on the shaft body of the positioning shaft, and a clamping circular sleeve toothed part is formed at the circumferential outer edge part of the clamping circular sleeve; the middle locking piece is arranged between the two rotating support plates, is arranged on one side of the clamping circular sleeve, is provided with a middle locking piece toothed part at a position corresponding to the clamping circular sleeve toothed part, and is matched with the clamping circular sleeve toothed part and can be mutually meshed and installed together, so that the locking and fixing of the clamping circular sleeve and the middle locking piece are realized; the locking block is pivoted on the shaft body of the connecting shaft, is arranged at one side of the middle locking piece far away from the clamping round sleeve, can be abutted and fixed with the middle locking piece, and can rotate around the connecting shaft in the vertical surfaces of the two rotating support plates and drive the middle locking piece to rotate so as to be separated from locking connection with the clamping round sleeve; the elastic element is sleeved on the shaft body of the connecting shaft, one end of the elastic element is fixedly embedded on one rotating support plate, and the other end of the elastic element can be hooked to the locking block and can apply acting force to the locking block.

In a specific embodiment of the present utility model, an unlocking protrusion is formed on a surface of the intermediate locking element opposite to the locking block in a protruding manner, and a locking surface is formed on a surface of the intermediate locking element opposite to the locking block, the locking surface is formed at an end position in a height direction of the intermediate locking element, and an intermediate locking element concave portion is formed between the unlocking protrusion and the locking surface; a locking block protruding part is formed on the locking block in a protruding way, and the locking block protruding part is arranged opposite to the middle locking piece; when in a locking state, the locking block protruding part can be abutted with a locking surface on the middle locking piece, and the locking surface can restrict the movement of the locking block protruding part; and in the process of rotating the locking block, the protrusion part of the locking block moves into the concave part of the middle locking piece and is abutted to the unlocking convex block, so that the unlocking convex block is further pushed to move, and the middle locking piece is rotated, so that the middle locking piece is separated from locking with the clamping round sleeve.

In another specific embodiment of the present utility model, a locking block connection portion is formed on the locking block, the locking block connection portion protrudes out of the rotating frame body, and a cable connection hole penetrating through the thickness direction of the locking block connection portion is formed on the locking block connection portion, and the cable connection hole is used for being connected with a cable.

In another specific embodiment of the present utility model, the elastic element is a torsion spring, a torsion spring caulking groove is formed at an edge position of the rotating support plate body, one end of the elastic element is embedded in the torsion spring caulking groove, a hooking groove is formed on the locking block, and the other end of the elastic element can be hooked in the hooking groove and apply an acting force to the locking block.

In a further specific embodiment of the utility model, the positioning shaft is provided with a cylindrical section, a mounting section and a square shaft section, wherein the mounting section is formed between the cylindrical section and the square shaft section; the two rotary support plates are respectively sleeved on the cylindrical section and the mounting section in a rotary mode, and the clamping circular sleeve is fixedly connected with the mounting section.

In a further specific embodiment of the present utility model, a plurality of mounting segment engaging blocks are protruded on the outer circumferential surface of the mounting segment, a locking round sleeve through hole adapted to the shape of the mounting segment is formed at the center position of the locking round sleeve, a plurality of locking round sleeve engaging grooves are formed on the inner circumferential surface of the locking round sleeve through hole and at positions corresponding to the plurality of mounting segment engaging blocks, and the plurality of mounting segment engaging blocks are engaged and mounted in the corresponding locking round sleeve engaging grooves, so that the fixed connection between the positioning shaft and the locking round sleeve is realized.

In a further specific embodiment of the present utility model, a first expansion limiting portion i and a second expansion limiting portion ii are formed on the circumferential outer edge portion of the locking round sleeve in an outward protruding manner, the first expansion limiting portion i is formed at a position of the locking round sleeve body relative to the intermediate locking member, the second expansion limiting portion ii is formed at a position of the locking round sleeve body far away from the intermediate locking member, and a limiting shaft connected between the two rotating support plates is further disposed between the rotating support bodies, the limiting shaft can be in abutting connection with both the first expansion limiting portion i and the second expansion limiting portion ii, and the limiting shaft can move between the first expansion limiting portion i and the second expansion limiting portion ii, so that a movement stroke of the rotating support bodies is limited.

In a further specific embodiment of the present utility model, the rotating frame body further includes an intermediate locking member engaging shaft and a supporting shaft fixedly connected between the two rotating frame plates; the middle locking piece matching shaft is arranged at a position close to the connecting shaft, and the middle locking piece matching shaft is sleeved with the middle locking piece matching shaft in a matching way; the support shaft is arranged between the two end parts of the rotating support plates in the length direction, which are far away from the connecting shaft, and the two end parts of the support shaft and the middle locking piece matching shaft in the axial direction are protruded out of the rotating support plate body.

The utility model has the beneficial effects that due to the adoption of the structure, the utility model has the following advantages: firstly, the locking device has small structure volume and small space occupation, the clamping round sleeve, the middle locking piece and the locking block are sequentially arranged in the inner containing cavity of the rotating frame body, the locking effect is good, the structure is compact and reliable, the assembly is convenient, the adaptability is strong, the whole parts are few, the use volume can be greatly reduced, and the whole arrangement is convenient; secondly, as the rotating frame body comprises two rotating support plates which are arranged at intervals, the two rotating support plates can cover the inner clamping round sleeve, the middle locking piece and the locking block, so that the protection effect is achieved, and the safety is further improved; thirdly, locking is carried out by utilizing a mode that the toothed part of the middle locking piece is meshed with the toothed part of the clamping circular sleeve, the locking strength of the toothed part and the toothed part of the clamping circular sleeve is high, the impact bearing performance is high, a shaking gap is hardly formed, the stability and the reliability of locking are ensured, and the comfortable use feeling can be improved; fourth, because the fixed suit of block circle cover detachably is on the axis body of location axle, simple to operate and assembly are firm between the two, when the circumstances of block circle cover wearing and tearing damage appears, only need to maintain or change the block circle cover can, therefore alleviateed the maintenance degree of difficulty greatly and can reduce subsequent cost of maintenance.

Drawings

FIG. 1 is a schematic diagram of an overall structure of an embodiment of the present utility model;

FIG. 2 is a schematic view of the internal structure of the embodiment shown in FIG. 1;

FIG. 3 is an exploded view of the embodiment of FIG. 1;

FIG. 4 is a cross-sectional view of the present utility model in a locked state;

fig. 5 is a cross-sectional view of the structure of the present utility model in an unlocked state.

In the figure: 1. positioning shaft, 11, cylindrical section, 12, mounting section, 121, mounting section jogging block, 13, square shaft section; 2. the device comprises a rotating frame body, a rotating support plate, a torsional spring caulking groove, a connecting shaft, a limiting shaft, a middle locking piece matching shaft and a supporting shaft, wherein the rotating frame body, the rotating support plate, the torsional spring caulking groove, the connecting shaft, the limiting shaft and the middle locking piece matching shaft are arranged in sequence, and the middle locking piece matching shaft is arranged in sequence; 3. the device comprises a clamping circular sleeve, a clamping circular sleeve toothed part, a clamping circular sleeve through hole, a clamping circular sleeve embedded groove, a first expansion limiting part I, a second expansion limiting part 34 and a second expansion limiting part II, wherein the clamping circular sleeve is provided with a clamping circular sleeve toothed part, a clamping circular sleeve through hole, a clamping circular sleeve embedded groove and a clamping circular sleeve through hole; 4. intermediate locking element, 41, intermediate locking element tooth portion, 42, unlocking lug, 43, locking surface, 44, intermediate locking element concave part; 5. the cable connecting device comprises a locking block, a 51, a protruding part of the locking block, a 52, a connecting part of the locking block, a 521, a cable connecting hole and a 53, and a hooking groove; 6. an elastic element.

Detailed Description

The following detailed description of specific embodiments of the utility model, while given in connection with the accompanying drawings, is not intended to limit the scope of the utility model, and any changes that may be made in the form of the inventive concepts described herein, without departing from the spirit and scope of the utility model.

In the following description, all concepts related to the directions (or azimuths) of up, down, left, right, front and rear are directed to the position states where the drawings are being described, so as to facilitate public understanding, and thus should not be construed as being particularly limiting to the technical solutions provided by the present utility model.

Referring to fig. 1 and 2, a vehicle seat armrest locking device is shown, which includes a positioning shaft 1 for connecting to an armrest mounting seat, and the positioning shaft 1 is fixedly assembled on the armrest mounting seat; the rotating frame body 2 is also shown, the rotating frame body 2 comprises two rotating support plates 21 and a connecting shaft 22 which are arranged at intervals, the rotating frame body 2 is used for being connected to a handrail framework and can rotate together with the handrail, the two rotating support plates 21 are movably sleeved on the shaft body of the positioning shaft 1 and are in rotating connection with the shaft body, and the connecting shaft 22 is fixedly arranged between one end parts of the two rotating support plates 21 in the length direction; a clamping circular sleeve 3 which is arranged between the two rotary support plates 21 and is detachably and fixedly sleeved on the shaft body of the positioning shaft 1, wherein a clamping circular sleeve toothed part 31 is formed at the peripheral outer edge part of the clamping circular sleeve 3; also shown is an intermediate locking element 4 which is arranged between the two rotary support plates 21 and with which the intermediate locking element 4 is arranged on one side of the clamping circular sleeve 3 and can be brought into locking connection, and an intermediate locking element toothed portion 41 is formed on the intermediate locking element 4 and at a position corresponding to the clamping circular sleeve toothed portion 31, wherein the intermediate locking element toothed portion 41 is matched with the clamping circular sleeve toothed portion 31 and can be mutually engaged and mounted together, so that the locking fixation of the clamping circular sleeve 3 and the intermediate locking element 4 is achieved; a locking block 5 pivoted on the shaft body of the connecting shaft 22, wherein the locking block 5 is arranged at a position of one side of the middle locking piece 4 away from the clamping round sleeve 3, the locking block 5 can be abutted and fixed with the middle locking piece 4, the locking block 5 can rotate around the connecting shaft 22 in the vertical surfaces of the two rotating support plates 21 and drive the middle locking piece 4 to move so as to be separated from locking connection with the clamping round sleeve 3, and the locking block 5 can be connected with a zipper piece inside the handrail and rotate around the connecting shaft 22 under the driving of the zipper piece; also shown is an elastic element 6, the middle part of the elastic element 6 is sleeved on the shaft body of the connecting shaft 22, one end of the elastic element 6 is fixedly embedded on the rotating support plate 21, the other end of the elastic element 6 can be hooked on the locking block 5, and in the unlocking state, the elastic element 6 can apply a force towards the middle locking piece 4 to the locking block 5.

With continued reference to fig. 2 to 5, in this embodiment, the middle locking piece insection portion 41 can be tightly combined with the clamping circular sleeve insection portion 31, and is convenient to combine when being mutually meshed, and meanwhile, the tightness of connection fixation of the clamping circular sleeve 3 and the middle locking piece 4 when the handrail is in a locking state can be effectively ensured, so that zero clearance is ensured when the handrail is in a locking position, and the situation that the middle locking piece 4 shakes due to external force vibration can be avoided, so that the rotating frame body 1 does not shake, and the reliability and comfort of use are effectively improved.

In the present embodiment, an unlocking protrusion 42 is formed on a side surface of the intermediate locking member 4 opposite to the locking block 5 in a protruding manner, a locking surface 43 is formed on a side surface of the intermediate locking member 4 opposite to the locking block 5, the locking surface 43 is formed at an end position in a height direction of the intermediate locking member 4, and an intermediate locking member concave portion 44 is formed between the unlocking protrusion 42 and the locking surface 43; a locking block protruding part 51 is formed on the locking block 5 in a protruding way, and the locking block protruding part 51 is arranged opposite to the middle locking piece 4; in the locked state, the locking block protruding part 51 can be abutted against the locking surface 43 on the intermediate locking piece 4, and the locking surface 43 can restrict the movement of the locking block protruding part 51; and during the rotation of the locking block 5, the locking block protruding part 51 moves into the concave part 44 of the middle locking piece and abuts against the unlocking lug 42, so as to further push the unlocking lug 42 to move and rotate the middle locking piece 4, so that the middle locking piece is out of locking with the clamping round sleeve 3.

With continued reference to fig. 2 and 3, and fig. 4 and 5 may be combined, a lock block connecting portion 52 is formed on the lock block 5, the lock block connecting portion 52 protrudes out of the rotating frame 2, and a cable connecting hole 521 penetrating through the thickness direction of the lock block connecting portion 52 is formed on the lock block connecting portion 52, and the cable connecting hole 521 is used for connecting with a cable; the stay cable is used for pulling the locking block 5 to rotate and realize the integral unlocking operation, and the related connection mode and working principle of the stay cable can be specifically referred to the middle armrest locking mechanism of the automobile rear seat disclosed by the utility model patent of CN 204774782U.

Further, the elastic element 6 is a torsion spring, a torsion spring caulking groove 211 is formed at the edge of the plate body of the rotating support plate 21, a hooking groove 53 is formed on the locking block 5, and the other end of the elastic element 6 can be hooked in the hooking groove 53 and apply a force towards the middle locking piece 4 to the locking block 5; the elastic element 6 as a torsion spring has the advantage of simple structure, can be conveniently sleeved on the connecting shaft 22 during installation, is not easy to slip during use, has large instant torsion force, and ensures firm and tight combination of the middle locking piece 4 and the locking block 5.

In the present embodiment, the positioning shaft 1 includes a cylindrical section 11, a mounting section 12, and a square shaft section 13, and the mounting section 12 is formed between the cylindrical section 11 and the square shaft section 13; the two rotary support plates 21 are respectively sleeved on the cylindrical section 11 and the mounting section 12 in a rotary manner, and the clamping round sleeve 3 is fixedly connected with the mounting section 12.

Further, a plurality of mounting section engaging blocks 121 are protruded on the outer circumferential surface of the mounting section 12, a locking round sleeve through hole 32 which is matched with the shape of the mounting section 12 is formed at the central position of the locking round sleeve 3, a plurality of locking round sleeve engaging grooves 321 are formed on the inner circumferential surface of the locking round sleeve through hole 32 and at positions corresponding to the plurality of mounting section engaging blocks 121, and the plurality of mounting section engaging blocks 121 are engaged and mounted in the corresponding locking round sleeve engaging grooves 321, so that the fixed connection between the positioning shaft 1 and the locking round sleeve 3 is realized; the positioning shaft 1 and the clamping round sleeve 3 can be fixedly connected through the key slot, the positioning shaft 1 and the clamping round sleeve 3 are convenient to install and firm to assemble, the positioning shaft 1 and the clamping round sleeve 3 adopt a split type structure instead of an integral structure, and when the clamping round sleeve 3 is worn and damaged, the clamping round sleeve 3 is only required to be maintained or replaced, so that the maintenance difficulty is greatly reduced, and the subsequent maintenance cost can be reduced.

In this embodiment, a first expansion limit portion i 33 and a second expansion limit portion ii 34 are formed on the circumferential outer edge portion of the engaging round sleeve 3 in an outward protruding manner, the first expansion limit portion i 33 is formed at a position of the engaging round sleeve 3 body relative to the intermediate locking member 4, the second expansion limit portion ii 34 is formed at a position of the engaging round sleeve 3 body away from the intermediate locking member 4, and a limit shaft 23 connected between the two rotating support plates 21 is further provided between the rotating support bodies 2, the limit shaft 23 can be abutted against both the first expansion limit portion i 33 and the second expansion limit portion ii 34, and the limit shaft 23 can move between the first expansion limit portion i 33 and the second expansion limit portion ii 34, thereby limiting a movement stroke of the rotating support bodies 2; and concave curved surfaces matched with the shapes and the sizes of the limiting shafts 23 are formed on the first expansion limiting portion I33 and the second expansion limiting portion II 34, the limiting shafts 23 can be matched and abutted on the concave curved surfaces in the first expansion limiting portion I33 and the second expansion limiting portion II 34, so that the reliability of tightly attaching and limiting is ensured, when the limiting shafts 23 are rotationally abutted to the second expansion limiting portion II 34, the rotating frame body 2 is in a locking state, the whole handrail is in a folding matched state, and when the limiting shafts 23 are rotationally abutted to the first expansion limiting portion I33, the whole handrail is in a full-open state.

Referring to fig. 1 in combination with fig. 3, the rotating frame 2 further includes an intermediate locking member engaging shaft 24 and a supporting shaft 25 fixedly connected between the two rotating frame plates 21; the intermediate locking member engaging shaft 24 is provided at a position close to the connecting shaft 22, and the intermediate locking member 4 is engaged and fitted on the intermediate locking member engaging shaft 24; the supporting shafts 25 are disposed between the other ends of the two rotating support plates 21 in the length direction, which are far away from the connecting shaft 22, and the two axial ends of the supporting shafts 25 and the middle locking element matching shaft 24 protrude outside the plate body of the rotating support plates 21; the armrest skeleton is provided with a matching hole corresponding to the supporting shaft 25 and the middle locking piece matching shaft 24, the protruding end parts of the supporting shaft 25 and the middle locking piece matching shaft 24 can be embedded in the matching hole, and the rotating support plate 21 and the armrest skeleton can be welded and fixed together during installation, so that stable and reliable connection of the rotating support body 2 and the armrest is ensured.

Referring to fig. 1 to 5, the applicant briefly describes the working principle of the present utility model: when the vehicle seat armrest locking device is installed, the two locking devices are respectively installed on the left side and the right side of the armrest framework in a group, the positioning shaft 1 is fixedly connected with the armrest installation seat at the bottom of the armrest framework, the rotating frame body 2 is fixedly connected with the armrest framework and rotates along with the rotation of the armrest, and related connection modes of the armrest locking device can be referred to related technical information in an automobile rear seat center armrest and an automobile described in patent document of an authorized publication number CN219339268U and are not repeated herein; referring to fig. 4, the rotating frame body 2 is in a locking state, the armrest is in a folding and matching state, at this time, the limiting shaft 23 in the rotating frame body 2 is abutted against the second expansion limiting part ii 34 of the clamping round sleeve 3, the middle locking piece toothed part 41 is meshed and locked with the clamping round sleeve toothed part 31, the clamping round sleeve 3 and the middle locking piece 4 are locked and fixed together, the locking piece protruding part 51 of the locking piece 5 is abutted against the locking surface 43 on the middle locking piece 4 to realize self fixation, the components are tightly combined, a shaking gap is not existed, and the use reliability is greatly improved; referring to fig. 5, when unlocking of the rotating frame body 2 is required to be achieved to unfold the handrail, the locking block 5 is pulled by the cable, and the locking block 5 rotates counterclockwise around the connecting shaft 22 as shown in fig. 5, the locking block protruding portion 51 of the locking block 5 is out of contact with the locking surface 43 on the intermediate locking piece 4, and further rotates into the aforesaid intermediate locking piece concave portion 44 and abuts against the aforesaid unlocking protruding portion 42, so as to further push the unlocking protruding portion 42 to move and cause the intermediate locking piece 4 to rotate counterclockwise, so that the intermediate locking piece toothed portion 41 and the clamping circular sleeve toothed portion 31 of the intermediate locking piece 4 are separated from each other, thereby achieving unlocking of the intermediate locking piece 4 and the clamping circular sleeve 3, enabling the rotating frame body 2 and the handrail to rotate, and when the limiting shaft 23 of the rotating frame body 2 rotates and abuts against the first expansion limiting portion i 33, the whole handrail is in a fully opened state; and in the process of rotating the middle locking piece 4, the unlocking lug 42 of the middle locking piece is abutted against the elastic element 6, when the armrest needs to be folded and unfolded after the opening is completed, the elastic element 6 can apply a force towards the middle locking piece 4 to the locking piece 5, so that the locking piece 5 is reset and pushes the middle locking piece 4 to move towards the clamping round sleeve 3, the middle locking piece toothed portion 41 and the clamping round sleeve toothed portion 31 are meshed and locked together, and the tightness of secondary locking is ensured.

In summary, the technical scheme provided by the utility model overcomes the defects in the prior art, successfully completes the task of the utility model, and faithfully honors the technical effects carried by the applicant in the technical effect column above.

Claims

1. A vehicle seat armrest locking device, comprising: a positioning shaft (1) for connection to the armrest mounting base; the rotating frame body (2) comprises two rotating support plates (21) and a connecting shaft (22) which are arranged at intervals, the rotating frame body (2) is connected to the handrail framework and can rotate together with the handrail, the two rotating support plates (21) are movably sleeved on the shaft body of the positioning shaft (1) and are in rotating connection with the positioning shaft, and the connecting shaft (22) is fixedly arranged between one end part of the two rotating support plates (21) in the length direction; the clamping circular sleeve (3) is arranged between the two rotating support plates (21) and is detachably and fixedly sleeved on the shaft body of the positioning shaft (1), and a clamping circular sleeve toothed part (31) is formed at the circumferential outer edge part of the clamping circular sleeve (3); an intermediate locking piece (4) arranged between the two rotary support plates (21), wherein the intermediate locking piece (4) is arranged on one side of the clamping round sleeve (3), an intermediate locking piece toothed part (41) is formed on the intermediate locking piece (4) at a position corresponding to the clamping round sleeve toothed part (31), and the intermediate locking piece toothed part (41) is matched with the clamping round sleeve toothed part (31) and can be mutually meshed and installed together, so that the locking fixation of the clamping round sleeve (3) and the intermediate locking piece (4) is realized; the locking block (5) is pivoted on the shaft body of the connecting shaft (22), the locking block (5) is arranged at one side position of the middle locking piece (4) away from the clamping round sleeve (3), the locking block (5) can be abutted and fixed with the middle locking piece (4), and the locking block (5) can rotate around the connecting shaft (22) in the vertical surfaces of the two rotating support plates (21) and drive the middle locking piece (4) to rotate so as to be separated from locking connection with the clamping round sleeve (3); an elastic element (6) is sleeved on the shaft body of the connecting shaft (22), one end of the elastic element (6) is fixedly embedded on one rotating support plate (21), and the other end of the elastic element (6) can be hooked to the locking block (5) and can apply acting force to the locking block (5).

2. A vehicle seat armrest locking device as set forth in claim 1, wherein: an unlocking lug (42) is convexly arranged on the surface of one side of the middle locking piece (4) opposite to the locking block (5), a locking surface (43) is formed on the surface of one side of the middle locking piece (4) opposite to the locking block (5), the locking surface (43) is formed at the position of one end part of the middle locking piece (4) in the height direction, and a middle locking piece concave part (44) is formed between the unlocking lug (42) and the locking surface (43); a locking block protruding part (51) is formed on the locking block (5) in a protruding mode, and the locking block protruding part (51) is arranged opposite to the middle locking piece (4); in the locked state, the locking block protruding part (51) can be abutted with a locking surface (43) on the middle locking piece (4), and the locking surface (43) can restrict the movement of the locking block protruding part (51); and during the rotation of the locking block (5), the locking block protruding part (51) moves into the concave part (44) of the middle locking piece and is abutted on the unlocking lug (42), so that the unlocking lug (42) is further pushed to move and the middle locking piece (4) is rotated so as to be separated from locking with the clamping round sleeve (3).

3. A vehicle seat armrest locking device as set forth in claim 1, wherein: the locking block (5) is provided with a locking block connecting part (52), the locking block connecting part (52) outwards protrudes out of the rotating frame body (2), the locking block connecting part (52) is provided with a guy cable connecting hole (521) penetrating through the thickness direction of the locking block connecting part, and the guy cable connecting hole (521) is used for being connected with a guy cable.

4. A vehicle seat armrest locking device as set forth in claim 1, wherein: the elastic element (6) is a torsion spring, a torsion spring caulking groove (211) is formed in the edge position of the plate body of the rotary support plate (21), one end part of the elastic element (6) is embedded in the torsion spring caulking groove (211), a hooking groove (53) is formed in the locking block (5), and the other end of the elastic element (6) can be hooked in the hooking groove (53) and apply acting force to the locking block (5).

5. A vehicle seat armrest locking device as set forth in claim 1, wherein: the positioning shaft (1) is provided with a cylindrical section (11), a mounting section (12) and a square shaft section (13), wherein the mounting section (12) is formed between the cylindrical section (11) and the square shaft section (13); the two rotary support plates (21) are respectively sleeved on the cylindrical section (11) and the mounting section (12) in a rotary mode, and the clamping round sleeve (3) is fixedly connected with the mounting section (12).

6. A vehicle seat armrest locking device as set forth in claim 5, wherein: a plurality of mounting section jogging blocks (121) are convexly arranged on the outer peripheral surface of the mounting section (12), a clamping round sleeve through hole (32) matched with the shape of the mounting section (12) is formed in the center position of the clamping round sleeve (3), a plurality of clamping round sleeve jogging grooves (321) are formed in the inner peripheral surface of the clamping round sleeve through hole (32) and at positions corresponding to the plurality of mounting section jogging blocks (121), and the plurality of mounting section jogging blocks (121) are jogged and mounted in the corresponding clamping round sleeve jogging grooves (321), so that the fixed connection of the positioning shaft (1) and the clamping round sleeve (3) is realized.

7. A vehicle seat armrest locking device as claimed in any one of claims 1 to 6, wherein: the utility model provides a clamping round sleeve (3) circumference periphery position outwards establishes to be formed with first expansion limit part I (33) and second expansion limit part II (34), first expansion limit part I (33) constitution in clamping round sleeve (3) body for the position department of middle closure (4), just second expansion limit part II (34) constitution in clamping round sleeve (3) body keep away from one side position department of middle closure (4), and still be provided with between rotating frame body (2) and connect spacing axle (23) between two rotating frame board (21), this spacing axle (23) can all realize the butt with first expansion limit part I (33) and second expansion limit part II (34), and this spacing axle (23) can be in first expansion limit part I (33) and second expansion limit part II (34) between the motion to rotating frame body (2) motion is restricted.

8. A vehicle seat armrest locking device as set forth in claim 7, wherein: the rotating frame body (2) further comprises a middle locking piece matching shaft (24) and a supporting shaft (25) which are fixedly connected between the two rotating support plates (21); the middle locking piece matching shaft (24) is arranged at a position close to the connecting shaft (22), and the middle locking piece (4) is matched and sleeved on the middle locking piece matching shaft (24); the supporting shafts (25) are arranged between the other end parts, far away from the connecting shafts (22), of the two rotating support plates (21) in the length direction, and the two axial end parts of the supporting shafts (25) and the middle locking piece matching shafts (24) are protruded out of the outer sides of the plate bodies of the rotating support plates (21).