CN213993013U - Armrest assembly - Google Patents

Abstract

The utility model discloses a handrail assembly, including handrail skeleton, it has handrail body to support on this handrail skeleton, is provided with slewing mechanism between handrail body and the handrail skeleton, and this slewing mechanism allows handrail body at horizontal rotation, still is provided with at least one straight line slide mechanism between handrail body and the handrail skeleton, and straight line slide mechanism allows handrail body relative handrail skeleton to slide along corresponding direction in the horizontal plane. The utility model has the advantages that: the handrail assembly has integrated the motion structure of a plurality of directions such as horizontal slip, horizontal rotation, and the function is abundant, can adapt to different users' demand, and the travelling comfort is good.

Description

Armrest assembly

Technical Field

The utility model belongs to the seat field, concretely relates to armrest assembly.

Background

Home and office chairs continue to evolve toward having more abundant functionality and better comfort. The chair arm rest is an important component of the chair. In the face of people with different body types and different use habits and the requirements of different use scenes, the structure and the function of the seat armrest continuously evolve. For example, people of different heights can have different armrest heights in their comfort positions after sitting. People with different arm lengths have different requirements on the length of the handrail. Furthermore, different people have different width requirements for the handrail. Even, because different people have different arm postures after sitting on the seat, the orientation requirements of the armrests are different. To accommodate the different needs of one or more of the above aspects for different users, the structure of the armrest must be functionally designed to be adjustable. From the viewpoint of product reliability and production cost, it is also necessary to make the adjustment structure of the armrest as simple as possible when incorporating the above structural design. Meanwhile, as a daily-use tool, the design of the seat armrest must also take ease of use and beauty into consideration.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a handrail assembly.

The technical scheme is as follows:

a handrail assembly comprises a handrail framework and a handrail body, wherein the handrail framework supports the handrail body, and the key point is that a rotating mechanism is arranged between the handrail body and the handrail framework and allows the handrail body to rotate in a horizontal plane;

at least one linear sliding mechanism is further arranged between the handrail body and the handrail framework and allows the handrail body to slide along the corresponding direction in the horizontal plane relative to the handrail framework.

Design more than adopting, the motion structure of a plurality of directions such as horizontal slip, horizontal rotation has been integrated to the handrail assembly, and the function is abundant, can adapt to different users' demand, and the travelling comfort is good.

As a preferred technical scheme, the handrail framework comprises a handrail support plate which is horizontally arranged, and the handrail support plate is supported with a strip-shaped handrail body;

two linear sliding mechanisms, namely a front sliding mechanism and a rear sliding mechanism and a lateral sliding mechanism, are arranged between the handrail body and the handrail supporting plate;

the front-back sliding mechanism allows the armrest body to slide on the armrest supporting plate along the length direction of the armrest body;

the lateral sliding mechanism allows the armrest body to slide on the armrest support plate in the width direction thereof.

By adopting the design, the handrail can move forwards and backwards to realize extension and move laterally to widen the handrail.

As a preferable technical solution, the armrest support plate is provided with the rotating mechanism, the rotating mechanism is provided with the front-rear sliding mechanism, the front-rear sliding mechanism is provided with the lateral sliding mechanism, and the armrest body is supported above the lateral sliding mechanism.

The design more than adopting, arrange slewing mechanism in the lower floor, slide mechanism arranges the upper strata in, guarantees that the focus of handrail body falls on handrail backup pad top all the time, and handrail body atress is stable, and the reliability improves.

As a preferred technical solution, the rotating mechanism includes a rotating shaft, the rotating shaft is fixedly arranged on the upper surface of the handrail supporting plate, a rotating plate is sleeved on the rotating shaft, the rotating plate falls on the handrail supporting plate, and a rotation anti-dropping plate is arranged at the upper end of the rotating shaft to prevent the rotating plate from dropping off the rotating shaft;

a rotation limiting mechanism and a rotation gear mechanism are further arranged between the rotating plate and the handrail supporting plate.

By adopting the design, the rotating mechanism is simple, and the rotating limiting mechanism and the rotating gear mechanism are arranged, so that the handrail body can be positioned at a plurality of positions.

As a preferred technical scheme, the rotation limiting mechanism comprises an arc-shaped groove and a rotation limiting pin;

the rotating plate is provided with the arc-shaped groove, the handrail supporting plate is fixedly provided with the rotating limiting pin, and the rotating limiting pin penetrates through the arc-shaped groove.

By adopting the design, the rotation limiting mechanism is simple and stable.

As a preferred technical scheme, the rotating gear mechanism comprises an elastic jacking pin, the lower surface of the rotating plate is provided with an elastic jacking pin chamber for accommodating the elastic jacking pin, the upper surface of the handrail supporting plate is provided with an elastic jacking pin positioning groove, and the elastic jacking pin positioning groove is communicated with the elastic jacking pin chamber in a right-to-right manner and limits the elastic jacking pin in the elastic jacking pin chamber;

the elastic jacking pin comprises a positioning pressure spring, one end of the positioning pressure spring is fixedly connected with one end of the jacking pin positioning groove, the other end of the positioning pressure spring is provided with a positioning pin, one end of the positioning pin is inserted into the positioning pressure spring, and the other end of the positioning pin jacks the inner wall of the jacking pin chamber;

the elastic ejection pin chamber is provided with a positioning rack on the inner wall corresponding to the free end of the elastic ejection pin, the positioning rack is arranged along an arc line with the rotating shaft as a central line, and the positioning pin extends into any notch of the positioning rack.

By adopting the design, the elastic jacking pin is matched with the positioning rack, so that the handrail body can be positioned at different angles after rotating.

As a preferred technical scheme, the front and rear sliding mechanism comprises a front and rear guide block and a front and rear sliding plate, the front and rear sliding plate is in a strip shape, and the front and rear sliding plate is arranged on the rotating plate in a sliding manner along the length direction of the front and rear sliding plate;

the upper surface of the rotating plate is fixedly provided with the front and rear guide blocks, the front and rear sliding plates are provided with strip-shaped front and rear sliding holes along the length direction of the front and rear sliding plates, the front and rear guide blocks penetrate through the front and rear sliding holes, and the upper ends of the front and rear guide blocks extend out of the front and rear sliding holes and are connected with front and rear anti-falling plates so as to prevent the front and rear guide blocks from falling out of the front and rear sliding holes.

By adopting the design, the front and rear sliding mechanism is simple and reliable, the front and rear guide blocks play a role in guiding the front and rear sliding plates and are matched with the front and rear sliding holes to determine the limit positions of the front and rear sliding.

As a preferred technical scheme, the handrail body comprises a handrail base, and a handrail foam component is coated on the handrail base;

the side sliding mechanism comprises a side sliding groove and a side sliding guide block which are matched with each other, the side sliding groove is formed in the handrail base and is arranged along the width direction of the handrail body, and a side sliding abdicating hole penetrates through the bottom of the side sliding groove;

the front sliding plate and the rear sliding plate are fixedly provided with supporting blocks, the supporting blocks penetrate through the sideslip abdicating holes, and the supporting blocks are fixedly connected with the sideslip guide blocks so that the sideslip guide blocks fall into the sideslip chutes;

a side-sliding cover plate is fixedly connected above the side-sliding guide block and covers the side-sliding groove;

and a sideslip gear mechanism is also arranged between the handrail base and the front and rear sliding plates.

By adopting the design, the lateral sliding mechanism and the lateral sliding gear mechanism enable the handrail body to move laterally and realize positioning at a plurality of positions.

As a preferred technical scheme, the side-sliding gear mechanism comprises an elastic gear ring which is horizontally arranged on the front and rear sliding plates;

the gear plate is fixedly connected to the lower portion of the side-sliding cover plate, the gear plate is attached to the outer circular face of the gear ring, and at least one positioning protrusion is arranged on one face, facing the gear ring, of the gear plate.

By adopting the design, the positioning of the handrail body is conveniently realized.

As a preferred technical solution, the armrest assembly further comprises an armrest housing, which is disposed to surround the armrest support plate from below and in the horizontal direction;

a gap is reserved between the edge of the handrail supporting plate and the handrail shell, and a shielding plate covers the gap;

an outer sleeve is arranged below the armrest shell and is communicated with the inner cavity of the armrest shell, an inner sleeve is arranged in the outer sleeve and is connected with the armrest supporting plate;

an armrest arm is slidably inserted in a cavity between the outer sleeve and the inner sleeve, and a lifting locking mechanism is arranged between the armrest arm and the inner sleeve.

By adopting the design, the handrail assembly is high in attractiveness and can be adjusted in a lifting mode.

Compared with the prior art, the beneficial effects of the utility model are that: the handrail assembly has integrated the motion structure of a plurality of directions such as horizontal slip, horizontal rotation, and the function is abundant, can adapt to different users' demand, and the travelling comfort is good.

Drawings

Fig. 1 is a schematic structural view of a viewing angle of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;

fig. 4 is a schematic structural view of another viewing angle of the present invention;

FIG. 5 is a cross-sectional view taken along line C-C of FIG. 4;

FIG. 6 is a cross-sectional view taken along line D-D of FIG. 4;

FIG. 7 is a cross-sectional view taken along line E-E of FIG. 4;

FIG. 8 is a schematic view showing the mounting structure of the front and rear sliding plates;

FIG. 9 is a sectional view taken along line F-F in FIG. 4;

fig. 10 is a schematic view of the installation structure of the armrest base.

Detailed Description

The present invention will be further described with reference to the following examples and accompanying drawings.

A handrail assembly comprises a handrail framework and a handrail body, wherein the handrail framework supports the handrail body, and a rotating mechanism is arranged between the handrail body and the handrail framework and allows the handrail body to rotate in a horizontal plane. At least one linear sliding mechanism is further arranged between the handrail body and the handrail framework and allows the handrail body to slide along the corresponding direction in the horizontal plane relative to the handrail framework.

The handrail support plate 13 supports the handrail body in a strip shape. Two linear sliding mechanisms, namely a front sliding mechanism and a rear sliding mechanism and a lateral sliding mechanism, are arranged between the handrail body and the handrail supporting plate 13. The front-rear sliding mechanism allows the armrest body to slide on the armrest support plate 13 in the length direction thereof, and the lateral sliding mechanism allows the armrest body to slide on the armrest support plate 13 in the width direction thereof.

As shown in fig. 1 and 2, in the present embodiment, the armrest framework includes an armrest support plate 13 disposed horizontally, and an armrest housing 14, and the armrest housing 14 is disposed to surround the armrest support plate 13 from below and in the horizontal direction. A gap is reserved between the edge of the handrail support plate 13 and the handrail housing 14, and the shielding plate 10 is covered on the gap.

The handrail support plate 13 is provided with the rotating mechanism, the rotating mechanism is provided with the front and rear sliding mechanism, the front and rear sliding mechanism is provided with the lateral sliding mechanism, and the handrail body is supported above the lateral sliding mechanism.

Specifically, as shown in fig. 2, 4 and 5, the rotating mechanism includes a rotating shaft 13a, the rotating shaft 13a is fixedly disposed on the upper surface of the handrail supporting plate 13, a rotating plate 8 is sleeved on the rotating shaft 13a, the rotating plate 8 is dropped on the handrail supporting plate 13, a rotation preventing plate 9 is disposed at the upper end of the rotating shaft 13a, and the rotation preventing plate 9 is connected to the rotating shaft 13a through a screw to prevent the rotating plate 8 from being separated from the rotating shaft 13 a. A rotation limiting mechanism and a rotation gear mechanism are further arranged between the rotating plate 8 and the handrail supporting plate 13.

The rotation limiting mechanism comprises an arc-shaped groove 8b and a rotation limiting pin 13 b. The rotating plate 8 is provided with the arc-shaped groove 8b, the handrail framework is fixedly provided with the rotating limiting pin 13b, and the rotating limiting pin 13b penetrates through the arc-shaped groove 8 b.

As shown in fig. 2 and 5, the gear shifting mechanism includes an elastic pushing pin, the lower surface of the rotating plate 8 is provided with an elastic pushing pin chamber for accommodating the elastic pushing pin, the upper surface of the handrail supporting plate 13 is provided with an elastic pushing pin positioning groove, and the elastic pushing pin positioning groove is in direct communication with the elastic pushing pin chamber to limit the elastic pushing pin therein. The ejection pin positioning groove is used for limiting the position of the elastic ejection pin, and the ejection pin chamber is used as an avoiding space, so that the position of the elastic ejection pin is not influenced when the rotating plate 8 rotates.

The elastic jacking pin comprises a positioning pressure spring 12, one end of the positioning pressure spring 12 is fixedly connected with one end of the jacking pin positioning groove, the other end of the positioning pressure spring 12 is provided with a positioning pin 11, one end of the positioning pin 11 is inserted into the positioning pressure spring 12, and the other end of the positioning pin jacks the inner wall of the jacking pin chamber. The inner wall of the elastic ejection pin chamber, corresponding to the free end of the elastic ejection pin, is provided with a positioning rack 8c, the positioning rack 8c is arranged along an arc line with the rotating shaft 13a as a central line, and the positioning pin 11 extends into any notch of the positioning rack 8c to realize rotary positioning under the action of the pretightening force of the positioning pressure spring 12.

As shown in fig. 2, 7 to 9, the front-rear sliding mechanism includes a front-rear guide block 8d and a front-rear sliding plate 6, the front-rear sliding plate 6 is in a strip shape, and the front-rear sliding plate 6 is slidably disposed on the rotating plate 8 along a length direction thereof. Wherein, the middle part of the front and rear sliding plates 6 falls on the rotating plate 8, and the two ends of the front and rear sliding plates 6 respectively fall on the shielding plate 10.

The upper surface of the rotating plate 8 is integrally formed with a front and a rear guide blocks 8d, the front and the rear sliding plates 6 are provided with strip-shaped front and rear sliding holes 6a along the length direction thereof, and the front and the rear guide blocks 8d are penetrated in the front and the rear sliding holes 6 a. The upper end of the front and rear guide block 8d extends out of the front and rear sliding hole 6a and is connected with a front and rear anti-falling plate 7 to prevent the front and rear guide block 8d from falling out of the front and rear sliding hole 6 a. The edges of the front and rear slide holes 6a extend upward to form front and rear slide grooves in which the front and rear retaining plates 7 are disposed.

Front and back guide block 8d has two, and two front and back guide block 8d distribute along the length direction of front and back slide opening 6a to wear to establish around in slide opening 6a, two same piece is connected to front and back guide block 8d upper end front and back anticreep board 7, the front end or the rear end of front and back spout lean on around anticreep board 7 when, arrive extreme position promptly.

The section of the front and rear guide blocks 8d is in a rounded rectangle shape, and the length direction of the section of the front and rear guide blocks 8d is consistent with the length direction of the front and rear slide holes 6 a. The front and rear anti-drop plates 7 are fixed on the front and rear guide blocks 8d through screws, and two screws penetrate through each front and rear guide block 8 d.

As shown in fig. 2, 6 to 8, the armrest body includes an armrest base 3, and the armrest base 3 is covered with an armrest foam assembly. The handrail base 3 comprises a base plate which is adaptive to the shape of the handrail body, and the edge of the base plate is provided with an upward reinforcing flange 3 b. The middle part of the base plate is shifted upwards to form a box-shaped part 3a, the box-shaped part 3a is positioned above the rotating plate 8, and the inner cavity of the box-shaped part 3a is used as a space for accommodating the rotating plate 8 and a front guide block 8d, a front anti-dropping plate 7 and the like above the rotating plate.

The lateral sliding mechanisms are arranged between the two end parts of the base plate and the front and rear sliding plates 6 respectively, and the lateral sliding mechanisms are also respectively provided with a sideslip gear mechanism.

Wherein the lateral sliding mechanism comprises a lateral sliding groove and a lateral sliding guide block 4a which are matched with each other.

As shown in fig. 9 and 10, a pair of guide plates 3c arranged in parallel are respectively arranged on the upper surfaces of the two end portions of the base plate, the guide plates 3c are arranged along the width direction of the handrail base 3 and are connected with the reinforcing flange 3b, the pair of guide plates 3c and the base plate enclose a side sliding groove, and a side sliding yielding hole is formed in the base plate between the pair of guide plates 3 c.

The front and rear sliding plates 6 are fixedly provided with supporting blocks 6b, the supporting blocks 6b penetrate through the side-sliding yielding holes, the supporting blocks 6b are fixedly connected with side-sliding guide blocks 4a, and the side-sliding guide blocks 4a fall into the side sliding grooves.

And two ends of the side sliding groove are provided with limiting rib plates 3e, and the limiting rib plates 3e are connected with the reinforcing flange 3b at the end parts of the groove bottoms of the side sliding grooves.

A sideslip cover plate 4 is fixedly connected above the sideslip guide block 4a, and the sideslip cover plate 4 covers the sideslip groove.

The side sliding gear mechanism comprises an elastic gear ring 5, and the gear ring 5 is horizontally arranged on a front sliding plate 6 and a rear sliding plate 6. A gear plate 4b is fixedly connected to the lower portion of the side-sliding cover plate 4, the gear plate 4b is attached to the outer circular surface of the gear ring 5, and at least one positioning protrusion is arranged on one surface, facing the gear ring 5, of the gear plate 4 b.

As shown in fig. 2 and 7, the handrail foam assembly includes a foam support plate 2 having a box shape, the foam support plate 2 is open at a lower portion thereof, the foam support plate 2 is snap-fitted to the handrail base 3 and is snap-fitted to the reinforcement flange 3b, and a middle portion of the foam support plate 2 is seated on a bottom portion of the box portion 3 a. The outer surface of the foam supporting plate 2 is coated with handrail foam 1.

When the armrest body is pushed laterally, the armrest base 3 slides on the armrest frame. In the sliding direction along the armrest body, the positioning projection located in front of the shift ring 5 presses the shift ring 5 to deform it, and the shift ring 5 slides from one side of the positioning projection to the other side, thereby positioning the armrest body at a new position. When the gear ring 5 goes over the positioning bulge at the most edge, the limiting rib plate 3e abuts against the side sliding guide block 4a, and the handrail body is located at the lateral limit position.

As shown in fig. 1, 2 and 4, an outer sleeve 14a is vertically disposed below the armrest housing 14, the outer sleeve 14a communicates with an inner cavity of the armrest housing 14, an inner sleeve 13c is disposed inside the outer sleeve 14a, and the inner sleeve 13c is connected to the armrest support plate 13. The outer sleeve 14a and the inner sleeve 13c are connected with an armrest arm 22, and an accommodating cavity is formed in the upper portion of the armrest arm 22. The inner sleeve 13c is inserted into the accommodating cavity, the outer sleeve 14a is sleeved outside the armrest arm 22, and the outer sleeve 14a and the inner sleeve 13c are in sliding fit with the armrest arm 22.

A lifting locking mechanism is arranged between the armrest arm 22 and the inner sleeve 13 c. As shown in fig. 3 and 4, the lifting locking mechanism includes a locking plate 21, the locking plate 21 is fixedly disposed in the receiving cavity, a lock pin sliding slit 21a and a row of locking bayonets 21b are formed on the locking plate 21, all the locking bayonets 21b are located on the same side of the lock pin sliding slit 21a, all the locking bayonets 21b are distributed along the length direction of the lock pin sliding slit 21a, and all the locking bayonets 21b are communicated with the lock pin sliding slit 21a to form a comb-tooth-shaped lock pin through hole. The number of the locking plates 21 is two, the two locking plates 21 are arranged in parallel, the lock pin through holes of the two locking plates 21 are horizontally opposite, and the same lock pin 20 penetrates through the two lock pin through holes.

The lock pin 20 is connected with the lock rod assembly, and the lock rod assembly is arranged in the inner cavity of the handrail framework. The locking rod assembly comprises a connecting rod 19 vertically arranged in the inner sleeve 13c, the middle of the connecting rod 19 is connected with the inner sleeve 13c through a connecting rod rotating shaft 18 horizontally arranged, the lower end of the connecting rod 19 extends out of the inner sleeve 13c and then is provided with the locking pin 20, and the upper end of the connecting rod 19 is provided with a plug-in connector 19 a.

The locking rod assembly further comprises a bent driving rod 15a, a button rotating shaft 17 penetrates through a bent part of the bent driving rod 15a, the button rotating shaft 17 is parallel to the connecting rod rotating shaft 18, and the button rotating shaft 17 is fixedly connected with the handrail supporting plate 13.

As shown in fig. 3, both ends of the bent lever 15a extend downward, and one end of the bent lever 15a freely penetrates into the inner sleeve 13 c. The inner sleeve 13c is provided with a relief opening to allow the bending shift lever 15a to rotate. One end of the bending deflector rod 15a extending into the inner sleeve 13c is provided with a socket 15b corresponding to the connecting rod 19, and the socket 19a is inserted into the socket 15 b. The other end of the bent lever 15a is integrally formed with an unlocking lever 15 c.

One end of the unlocking rod 15c is connected with the bending shift rod 15a, the other end of the unlocking rod 15c freely penetrates out of the lower surface of the armrest shell 14, and the extending end of the unlocking rod 15c is provided with a button 15. An elastic reset piece 16 is arranged between the unlocking rod 15c and the armrest supporting plate 13, and the elastic reset piece 16 maintains the lifting locking mechanism in a locking state through the unlocking rod 15c and the locking rod assembly. The elastic restoring member 16 may be a compression spring having one end inserted into the button 15 and the other end abutting against the armrest support plate 13. The button 15 is pressed to unlock the lifting locking mechanism, the armrest body can be adjusted up and down, and the button 15 is released to lock.

The armrest assembly integrates multiple functions of up-down adjustment, rotation, front-back movement, left-right sliding and the like, and meets the requirements of different users.

Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and the scope of the present invention.

Claims (10)

1. The utility model provides a handrail assembly, includes handrail skeleton and handrail body, the handrail skeleton supports there is handrail body, its characterized in that: a rotating mechanism is arranged between the handrail body and the handrail framework and allows the handrail body to rotate in a horizontal plane;

at least one linear sliding mechanism is further arranged between the handrail body and the handrail framework and allows the handrail body to slide along the corresponding direction in the horizontal plane relative to the handrail framework.

2. The armrest assembly of claim 1 wherein: the handrail framework comprises a handrail supporting plate (13) which is horizontally arranged, and the handrail supporting plate (13) is supported with a strip-shaped handrail body;

two linear sliding mechanisms, namely a front sliding mechanism and a rear sliding mechanism and a lateral sliding mechanism, are arranged between the handrail body and the handrail supporting plate (13);

the front-back sliding mechanism allows the armrest body to slide on the armrest supporting plate (13) along the length direction of the armrest body;

the lateral sliding mechanism allows the armrest body to slide on the armrest support plate (13) in the width direction thereof.

3. The armrest assembly of claim 2 wherein: the handrail supporting plate (13) is provided with the rotating mechanism, the rotating mechanism is provided with the front and back sliding mechanism, the front and back sliding mechanism is provided with the lateral sliding mechanism, and the handrail body is supported above the lateral sliding mechanism.

4. The armrest assembly of claim 3 wherein: the rotating mechanism comprises a rotating shaft (13a), the rotating shaft (13a) is fixedly arranged on the upper surface of the handrail supporting plate (13), a rotating plate (8) is sleeved on the rotating shaft (13a), the rotating plate (8) falls on the handrail supporting plate (13), and a rotation anti-falling plate (9) is arranged at the upper end of the rotating shaft (13a) to prevent the rotating plate (8) from falling off the rotating shaft (13 a);

a rotation limiting mechanism and a rotation gear mechanism are further arranged between the rotating plate (8) and the handrail supporting plate (13).

5. The armrest assembly of claim 4 wherein: the rotation limiting mechanism comprises an arc-shaped groove (8b) and a rotation limiting pin (13 b);

the rotating plate (8) is provided with the arc-shaped groove (8b), the handrail supporting plate (13) is fixedly provided with the rotating limiting pin (13b), and the rotating limiting pin (13b) penetrates through the arc-shaped groove (8 b).

6. The armrest assembly of claim 4 wherein: the rotating gear mechanism comprises an elastic jacking pin, the lower surface of the rotating plate (8) is provided with an elastic jacking pin chamber for accommodating the elastic jacking pin, the upper surface of the handrail supporting plate (13) is provided with an elastic jacking pin positioning groove, and the elastic jacking pin positioning groove is communicated with the elastic jacking pin chamber in a right-to-right manner and limits the elastic jacking pin in the elastic jacking pin positioning groove;

the elastic jacking pin comprises a positioning compression spring (12), one end of the positioning compression spring (12) is fixedly connected with one end of the jacking pin positioning groove, the other end of the positioning compression spring (12) is provided with a positioning pin (11), one end of the positioning pin (11) is inserted into the positioning compression spring (12), and the other end of the positioning pin is jacked against the inner wall of the jacking pin chamber;

the elastic ejection pin chamber corresponds to a positioning rack (8c) is arranged on the inner wall of the free end of the elastic ejection pin, the positioning rack (8c) is arranged along an arc line with the rotating shaft (13a) as a central line, and the positioning pin (11) extends into any notch of the positioning rack (8 c).

7. The armrest assembly of claim 4 wherein: the front and rear sliding mechanism comprises a front and rear guide block (8d) and a front and rear sliding plate (6), the front and rear sliding plate (6) is in a strip shape, and the front and rear sliding plate (6) is arranged on the rotating plate (8) in a sliding manner along the length direction of the front and rear sliding plate;

the upper surface of the rotating plate (8) is fixedly provided with the front and rear guide blocks (8d), the front and rear sliding plates (6) are provided with strip-shaped front and rear sliding holes (6a) along the length direction of the front and rear sliding plates, the front and rear guide blocks (8d) penetrate through the front and rear sliding holes (6a), and the upper ends of the front and rear guide blocks (8d) extend out of the front and rear sliding holes (6a) and are connected with front and rear anti-falling plates (7) so as to prevent the front and rear guide blocks (8d) from falling off the front and rear sliding holes (6 a).

8. The armrest assembly of claim 7 wherein: the handrail body comprises a handrail base (3), and a handrail foam component is coated on the handrail base (3);

the lateral sliding mechanism comprises a lateral sliding groove and a lateral sliding guide block (4a), the lateral sliding groove and the lateral sliding guide block are matched with each other, the lateral sliding groove is formed in the handrail base (3), the lateral sliding groove is formed in the width direction of the handrail body, and a lateral sliding yielding hole penetrates through the bottom of the lateral sliding groove;

the front sliding plate and the rear sliding plate (6) are fixedly provided with supporting blocks (6b), the supporting blocks (6b) penetrate through the side sliding yielding holes, and the supporting blocks (6b) are fixedly connected with the side sliding guide block (4a) so that the side sliding guide block (4a) falls into the side sliding groove;

a side-sliding cover plate (4) is fixedly connected above the side-sliding guide block (4a), and the side-sliding cover plate (4) covers the side-sliding groove;

a sideslip gear mechanism is further arranged between the handrail base (3) and the front and rear sliding plates (6).

9. The armrest assembly of claim 8 wherein: the side-sliding gear mechanism comprises an elastic gear ring (5), and the gear ring (5) is horizontally arranged on the front and rear sliding plates (6);

the side sliding cover plate (4) is fixedly connected with a gear plate (4b) below, the gear plate (4b) is attached to the outer circular surface of the gear ring (5), and at least one positioning protrusion is arranged on one surface, facing the gear ring (5), of the gear plate (4 b).

10. The armrest assembly of claim 2 wherein: the handrail device further comprises a handrail shell (14), wherein the handrail shell (14) is arranged around the handrail support plate (13) from the lower part and the horizontal direction of the handrail support plate;

a gap is reserved between the edge of the handrail supporting plate (13) and the handrail shell (14), and a shielding plate (10) covers the gap;

an outer sleeve (14a) is arranged below the handrail casing (14), the outer sleeve (14a) is communicated with the inner cavity of the handrail casing (14), an inner sleeve (13c) is arranged in the outer sleeve (14a), and the inner sleeve (13c) is connected with the handrail support plate (13);

an arm supporting arm (22) is inserted in a cavity between the outer sleeve (14a) and the inner sleeve (13c) in a sliding mode, and a lifting locking mechanism is arranged between the arm supporting arm (22) and the inner sleeve (13 c).

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