CN107874504A - Armrest device - Google Patents

Abstract

An armrest apparatus includes a base, a fixing plate, a first pivot and a second pivot, an armrest plate, and a positioning unit. The fixing plate includes a first moving groove extending in a first direction. The first pivot is arranged in the first moving groove in a penetrating mode, and the second pivot is arranged on the fixing plate. The armrest plate comprises a sliding groove which extends along a second direction and is used for the first pivot and the second pivot to penetrate through. The positioning unit comprises a positioning module and a positioning plate with a magnetic attraction force between the positioning module and the armrest plate, and when the armrest plate moves relative to the fixed plate to drive one of the positioning module and the positioning plate to move relative to the other, the magnetic attraction force can cause resistance to the movement of the armrest plate relative to the fixed plate. Borrow this, can carry out the stepless adjustment to the shift position and the turned angle of this handrail board, can increase use comfort to have better market potential.

Description

Armrest

technical field

The invention relates to an armrest device, in particular to an armrest device suitable for being installed on both sides of a seat.

Background technique

It is a common design to add armrests on both sides of the seat for users to place their arms. Most of the original armrests are fixed and cannot be adjusted according to the user's body size, arm length, or customary bending angle.

Therefore, the prior art, as shown in US Patent No. US 20030030317A1, is a handrail device that can adjust the moving position and angle to increase the comfort of use. In order to avoid the adjusted position and angle from moving, the existing In the technology, a protruding point and a plurality of corresponding recesses are respectively provided on a sliding seat and a connecting rod, and the temporary positioning at different positions and angles is achieved by engaging the protruding point with different recesses Effect, yet, because described dimples are all fixed and the position of each dimple has a certain interval, if the angle that the user feels the most comfortable just in time between the positions of two dimples, the user will only be able to succumb to the position of the two dimples. Uncomfortable angles like this take away the beauty of designing an adjustable feature for added comfort.

Contents of the invention

The object of the present invention is to provide a handrail device capable of stepless adjustment of position and angle.

The armrest device of the present invention comprises a base, a fixing plate, a pivot unit, an armrest plate, and a positioning unit.

The fixing plate is arranged on the base and includes a first moving slot extending along a first direction.

The pivot unit includes a first pivot and a second pivot arranged at intervals along a second direction that is not parallel to the first direction, the first pivot passes through the first moving slot and can move along the The first direction moves back and forth in the first moving groove, and the second pivot is arranged on the fixing plate.

The armrest board includes a sliding slot extending along the second direction and passing through the first pivot and the second pivot, the first pivot and the second pivot can slide along the second direction on the Sliding back and forth in the groove, whereby the armrest board can move relative to the fixing board along the second direction and rotate around the second pivot shaft.

The positioning unit includes at least one positioning module arranged on the pivot unit, and a positioning plate adjacent to the positioning module and having a magnetic attraction force between the positioning module, thereby, when the armrest plate moves relative to the fixed plate When one of the positioning module and the positioning plate is driven to move relative to the other, the magnetic attraction force will cause resistance against the movement of the armrest plate relative to the fixed plate.

According to the armrest device of the present invention, the fixing plate further includes a second moving slot extending along the first direction and passing through the second pivot shaft, and the second pivot shaft can move along the first direction in the second moving slot Sliding back and forth in the center, whereby the armrest board can move relative to the fixed board along the first direction and rotate around the first pivot.

In the handrail device of the present invention, the positioning unit includes two positioning modules respectively arranged on the first pivot and the second pivot, and the positioning modules are arranged adjacent to the positioning plate and have a magnetic attraction force between them and the positioning plate. , so that when the armrest plate moves relative to the fixed plate to drive at least one positioning module and one of the positioning plate to move relative to the other, the magnetic attraction force will cause resistance against the movement of the armrest plate relative to the fixed plate .

In the armrest device of the present invention, the positioning plate is arranged on the armrest plate, the first pivot shaft has a first tooth portion formed on the peripheral surface around its own axis, and the second pivot shaft has a tooth portion formed on the peripheral surface around its own axis. The second tooth part, the positioning unit further includes two rack modules respectively meshing with the first tooth part and the second tooth part, the teeth of each rack module are arranged along the first direction, so that the first tooth part When the first pivot and the second pivot move back and forth along the first direction, the first tooth and the second tooth are respectively engaged with the rack module, so that the first pivot and the second The pivots rotate around their own axes at the same time, and drive the corresponding positioning module to rotate relative to the positioning plate.

In the armrest device of the present invention, the positioning plate is arranged on the fixing plate, the first pivot has a first tooth portion formed on the peripheral surface around its own axis, and the second pivot has a tooth portion formed on the peripheral surface around its own axis. The second tooth part, the positioning unit further includes a rack module engaged with the first tooth part and the second tooth part, the teeth of the rack module are arranged along the second direction, so that the first pivot and the second tooth part are aligned. When the second pivot moves back and forth in the sliding groove along the second direction, the first tooth portion and the second tooth portion engage with the rack module, so that the first pivot and the second pivot The shafts rotate around their own axes at the same time, and drive the corresponding positioning module to rotate relative to the positioning plate.

In the armrest device of the present invention, the positioning module is disposed on the first pivot.

In the armrest device of the present invention, the positioning plate is arranged on the armrest plate, the first pivot has a first tooth part formed on the peripheral surface around its own axis, and the positioning unit further includes a tooth meshing with the first tooth part A rack module, the teeth of the rack module are arranged along the first direction, so that when the first pivot moves back and forth along the first direction, the first tooth portion is engaged with the rack module, so that the first The pivot rotates around its own axis at the same time, and drives the positioning module to rotate relative to the positioning plate.

In the handrail device of the present invention, the positioning plate is arranged on the fixing plate, the first pivot has a first tooth portion formed on the peripheral surface around its own axis, and the positioning unit further includes a tooth meshing with the first tooth portion A rack module, the teeth of the rack module are arranged along the second direction, so that when the first pivot moves back and forth in the sliding slot along the second direction, the first tooth portion is engaged with the rack module , so that the first pivot rotates around its own axis at the same time, and drives the positioning module to rotate relative to the positioning plate.

In the handrail device of the present invention, the positioning module includes a positioning member having the magnetic attraction force between the positioning plate and the positioning plate, one of the positioning member and the positioning plate is made of magnetic material, and the other is made of ferromagnetic material.

According to the handrail device of the present invention, the positioning module includes a positioning member sleeved on the first pivot and having the magnetic attraction force between the positioning plate, and a positioning member arranged on the first pivot and engaged with the positioning member. When the accommodating part rotates around its own axis, the first pivot drives the accommodating part to drive the positioning part to rotate relative to the positioning plate.

The beneficial effect of the present invention is that: by arranging the positioning module and the positioning plate on the pivot unit, the magnetic force can provide resistance against the movement of the armrest plate relative to the fixed plate, thereby achieving a temporary positioning effect. Thereby, the user can adjust the moving position and the rotation angle of the armrest board relative to the fixing board steplessly, which can greatly increase the comfort in use and has better market potential.

Description of drawings

Fig. 1 is a three-dimensional exploded view of an embodiment of the armrest device of the present invention;

Fig. 2 is a three-dimensional assembled view of this embodiment;

Fig. 3 is an incomplete three-dimensional exploded view of this embodiment;

Fig. 4 is an incomplete three-dimensional combination diagram of this embodiment;

Fig. 5 is an incomplete schematic view of this embodiment, illustrating the cooperation state of a rack plate and a pivot unit of this embodiment;

Fig. 6 is another incomplete three-dimensional exploded view of this embodiment, illustrating another form of a fixing plate of this embodiment;

Figures 7 and 8 are fragmentary schematic views of this embodiment, illustrating that an armrest panel of this embodiment moves backward and forward relative to the pivot unit;

Figures 9 and 10 are an incomplete schematic diagram of this embodiment, illustrating that the armrest plate of this embodiment moves to the right and to the left relative to a fixed plate;

Figures 11 and 12 are an incomplete schematic view of this embodiment, illustrating that the armrest plate of this embodiment rotates to the left and to the right relative to the fixed plate; and

Fig. 13 is another configuration of the rack plate of this embodiment.

Detailed ways

Referring to Fig. 1, Fig. 2 and Fig. 3, an embodiment of the armrest device of the present invention, in actual application, is suitable for setting two present embodiments on the left and right sides of a seat (not shown) at the same time, to respectively provide The user's hands are placed.

This embodiment includes a base 2 , a fixing plate 3 , a pivot unit 4 , an armrest plate 5 , a positioning unit 6 , and a cushion 7 .

The base 2 is suitable for being fixed on one of the left and right sides of the seat, so as to provide a suitable height for the user to place the arms.

The fixed plate 3 is fixedly arranged on the base 2, as shown in Figures 1 and 3, it is fitted and locked in the depression at the top of the base 2, so as to increase the privacy and aesthetics of the mechanism and make it easier to use. When the reader looks down from the upper angle shown in Figure 2, he will not see the internal operating mechanism at all. The fixing plate 3 includes a first moving slot 31 and a second moving slot 32 respectively extending along a first direction L1.

It is worth mentioning that, in this embodiment, the first moving groove 31 and the second moving groove 32 are respectively in the shape of a straight line extending along the first direction L1, but the first moving groove 31 and the second moving groove 32 can also respectively be arc-shaped extending along the first direction L1, and the concave sides of the arcs face each other.

1, 3 and 4, the pivot unit 4 includes a first pivot 41 and a second pivot 42 respectively arranged at intervals along a second direction L2 that is not parallel to the first direction L1. The first pivot 41 passes through the first moving slot 31 and can move back and forth in the first moving slot 31 along the first direction L1, and the second pivot 42 passes through the second moving slot 32 and can move along the first direction L1. The first direction L1 moves back and forth in the second moving groove 32 .

Referring to Fig. 3, Fig. 4 and Fig. 5, the first pivot shaft 41 has a first tooth portion 411 formed on the peripheral surface around its own axis, and the second pivot shaft 42 has a second tooth portion 411 formed on the peripheral surface around its own axis. Teeth 421 .

The armrest board 5 includes a sliding slot 51 extending along the second direction L2 and passing through the first pivot 41 and the second pivot 42 , the extension length of the sliding slot 51 is longer than that of the first pivot 41 and the second pivot 42 . The distance between the second pivot 42 is such that the first pivot 41 and the second pivot 42 can slide back and forth in the sliding groove 51 along the second direction L2.

Thereby, the armrest plate 5 can move back and forth relative to the fixed plate 3 along the second direction L2, and by matching the first moving groove 31 and the second moving groove 32, the armrest plate 5 can also be moved relative to the fixed plate 3. The plate 3 moves back and forth along the first direction L1 and rotates around the first pivot 41 or the second pivot 42 respectively.

It is worth mentioning that, in this embodiment, the first moving groove 31 and the second moving groove 32 are provided at the same time, and the first pivot shaft 41 and the second pivot shaft 42 are passed through respectively to match the Sliding groove 51 provides that this handrail plate 5 can move forward and backward, move left and right and turn left and right relative to this fixed plate 3, but also can only have this first moving groove 31 as shown in Figure 6 according to actual product sales plan, and The second pivot 42 is pivotally arranged on the fixed plate 3. At this time, by matching the sliding groove 51, the armrest plate 5 can still move forward and backward relative to the fixed plate 3 and rotate left and right, so the adjustable movement of the present case can still be achieved. The purpose of position and angle.

Referring to Fig. 3, Fig. 4 and Fig. 5, the positioning unit 6 includes two positioning modules 61 respectively arranged at one end of the first pivot 41 and one end of the second pivot 42, and one adjacent to the positioning module 61. And there is a positioning plate 62 with magnetic attraction between the positioning module 61 and a rack plate 63 arranged under the fixing plate 3 .

It is worth mentioning that in this embodiment, in order to obtain a better positioning effect, two positioning modules 61 are respectively provided on the first pivot 41 and the second pivot 42, but it can also be adjusted according to actual application requirements. And cost considerations, only one positioning module 61 is provided on the first pivot 41 or the second pivot 42 .

Thereby, when the armrest plate 5 moves relative to the fixed plate 3 and drives at least one positioning module 61 and one of the positioning plate 62 to move relative to the other, the magnetic attraction force will cause resistance to the armrest plate 5 relative to the fixed plate 3 Resistance to movement.

Each positioning module 61 includes a positioning piece 611 having the magnetic attraction force between the positioning plate 62 and a receiving piece 612 for engaging with the positioning piece 611 .

The positioning pieces 611 are sleeved on the first pivot 41 and the second pivot 42 respectively, and each positioning piece 611 has a notch 613 . In this embodiment, the positioning member 611 is in the shape of a ring, but in actual application, it is enough to distribute it evenly, and it is not limited thereto.

One of the positioning member 611 and the positioning plate 62 is made of a magnetic material, and the other is made of a ferromagnetic material. In this embodiment, the positioning member 611 is a magnet, and the positioning plate 62 is an iron plate, but its material can be Choose according to actual needs, not limited to this.

The accommodating parts 612 are arranged on the first pivot 41 and the second pivot 42 respectively, and each accommodating part 612 is in the shape of a tray for the setting of the corresponding positioning part 611, and has a mating corresponding The protrusion 614 of the notch 613 of the positioning member 611, when the first pivot 41 and the second pivot 42 respectively rotate around their own axes, the first pivot 41 and the second pivot 42 are respectively connected. The corresponding accommodating part 612 drives the corresponding positioning part 611 to rotate relative to the positioning plate 62 .

The positioning plate 62 is locked to the armrest plate 5 and is linked by the movement of the armrest plate 5 .

The two opposite sides of the rack plate 63 are respectively adjacent to the first moving groove 31 and the second moving groove 32, and respectively form two teeth corresponding to the first tooth portion 411 and the second tooth portion 421. The rack modules 631 are engaged, and the teeth of each rack module 631 are arranged along the first direction L1.

Thereby, when the first pivot 41 and the second pivot 42 move along the first direction L1 respectively, since the first tooth part 411 and the second tooth part 421 are respectively in contact with the rack module 631 Engage to make the first pivot 41 and the second pivot 42 rotate around their own axes and drive the positioning module 61 to rotate relative to the positioning plate 62, thereby increasing the movement of the armrest plate 5 relative to the fixed plate 3 resistance.

When the first pivot 41 and the second pivot 42 move in the sliding groove 51 along the second direction L2, the first pivot 41 and the second pivot 42 respectively drive the corresponding positioning module 61 relative to The positioning plate 62 moves and temporarily positions the first pivot 41 and the second pivot 42 through the magnetic attraction force between the positioning module 61 and the positioning plate 62 when it stops.

Referring to FIG. 1 and FIG. 2 , the cushion 7 is arranged on the armrest board 5 for the user to place the arm to provide comfort.

In general use, the user can move the armrest plate 5 back and forth, left and right, and turn left and right relative to the fixed plate 3 according to their own needs. The details are as follows:

Referring to Fig. 4, Fig. 7 and Fig. 8, when the front and rear positions of the armrest board 5 are to be adjusted, the user can directly push the armrest board 5 back and forth, because the positioning module 61 and the positioning board 62 are passed through The positioning function is achieved by magnetic attraction, so the user can slide in the sliding groove 51 along the second direction L2 through the first pivot 41 and the second pivot 42 as long as the user exerts a little effort to overcome the magnetic attraction, and Push the armrest plate 5 to any position that the sliding groove 51 can allow, and when the user moves the armrest plate 5 to the desired position, only need to stop applying force, through the positioning module 61 and the positioning plate 62 The magnetic attraction between them can position the first pivot 41 and the second pivot 42 without displacement, that is to say, the position of the armrest board 5 can be positioned without displacement.

Referring to Fig. 4, Fig. 9 and Fig. 10, similarly, when the left and right positions of the armrest board 5 are to be adjusted, the user can also directly push the armrest board 5 left and right, through the first pivot 41 and the second pivot. The pivot 42 respectively slides back and forth in the first moving groove 31 and the second moving groove 32 along the first direction L1, and the armrest plate 5 can move left and right relative to the fixed plate 3, and by setting the teeth When the rack plate 63 of the rack module 631, the first pivot 41 and the second pivot 42 move along the first direction L1, they also rotate around their own axis, thereby increasing the first pivot. The resistance of the shaft 41 and the second pivot 42 when moving along the first direction L1 prevents the first pivot 41 and the second pivot 42 from easily moving along the first direction L1. Similarly, After the user moves the armrest plate 5 to the desired position, the user only needs to stop applying force, and the first pivot 41 and the second pivot 41 can be positioned by the magnetic attraction between the positioning module 61 and the positioning plate 62. The pivot 42 achieves the effect of positioning the armrest board 5 .

Referring to Fig. 4, Fig. 11 and Fig. 12, when the left and right rotation angle of the armrest board 5 is to be adjusted, the user can directly rotate the armrest board 5 left and right, through the first pivot 41 and the second pivot 42 Sliding in the first moving groove 31 and the second moving groove 32 respectively along the first direction L1 and opposite to the first direction L1, the armrest plate 5 can rotate left and right relative to the fixed plate 3, and by setting The rack plate 63 makes the first pivot 41 and the second pivot 42 rotate around their own axis when moving back and forth along the first direction L1, which can increase the resistance to prevent the first pivot 41 and the second The pivot 42 is easy to move along the first direction L1. Similarly, when the user rotates the armrest plate 5 to a desired angle, he only needs to stop applying force, and the positioning module 61 and the positioning plate 62 pass through the position. The magnetic force attracts the first pivot 41 and the second pivot 42 to locate the armrest board 5 .

Through the above description, the advantages of this embodiment can be summarized as follows:

1. Referring to FIG. 1 and FIG. 5 , by arranging the positioning module 61 on the pivot unit 4 and cooperating with the positioning plate 62, the magnetic attraction force can provide resistance against the movement of the armrest plate 5 relative to the fixed plate 3, To achieve a temporary positioning effect, and because the magnetic attraction does not have a switching position limit, the user can steplessly adjust the moving position and rotation angle of the armrest plate 5 relative to the fixed plate 3, which can overcome the problems in the prior art. Users often need to succumb to the problem of less comfortable angles, which can greatly increase the comfort of use, and can be applied to more types of user shapes, arm lengths, customary bending angles, etc., so it has better market potential .

Furthermore, by designing the first moving groove 31, the sliding groove 51, and matching the positioning module 61 and the positioning plate 62, the effect of reducing the volume of the mechanism can also be achieved, and the movement and rotation can be completed with a small volume. , positioning and other functions, and then all the above-mentioned mechanisms can be hidden inside the device, so as to achieve a simple and beautiful appearance (as shown in Figure 2), so it has better market potential.

2. By setting the second moving slot 32 for the second pivot 42 to pass through, the function of the armrest plate 5 moving left and right relative to the fixed plate 3 can be increased, and the angle of left and right rotation can be increased. A positioning module 61 can increase the positioning effect of the positioning plate 62 on the pivot unit 4, so as to improve the stability during positioning.

3. By setting the rack module 631 and setting the first tooth part 411 and the second tooth part 421 on the first pivot shaft 41 and the second pivot shaft 42 respectively, the first pivot shaft can be forced to The shaft 41 and the second pivot 42 will rotate around their own axis when moving along the first direction L1, thereby increasing the movement resistance to prevent the first pivot 41 and the second pivot 42 from easily moving along the first pivot. One side moves towards L1.

4. By setting the rack plate 63 to form the rack module 631, the desired effect can be achieved by adding simple elements. It is worth mentioning that the rack module 631 is not limited to being formed on the rack module 631. On the bar 63, it can also be directly formed on the edge of the first moving groove 31 and the second moving groove 32 of the fixed plate 3 (and cooperate with moving the position of the first tooth portion 411 and the second tooth portion 421 to correspond).

Furthermore, since the positioning plate 62 in this embodiment is fixedly arranged on the armrest plate 5 to provide resistance when the first pivot 41 and the second pivot 42 move along the second direction L2, it is necessary to In combination, the rack module 631 is designed to extend along the first direction L1, so as to provide resistance when the first pivot 41 and the second pivot 42 move along the first direction L1, but in actual application, its The direction can also be interchanged, the positioning plate 62 can be fixedly arranged on the fixing plate 3, and the positioning module 61 can be arranged adjacent to the positioning plate 62 to provide the first pivot 41 and the second pivot 42 resistance when moving along the first direction L1, and then design the rack module 631 to extend along the second direction L2 (can be designed as a rack extending along the second direction L2 as shown in FIG. 13 Plate 63 or directly arranged along the edge of the slide groove 51) to provide resistance when the first pivot 41 and the second pivot 42 move along the second direction L2, which can be selected according to actual needs The required combinations are not limited thereto.

5. Referring to FIG. 1 and FIG. 5, the magnetic attraction force of the positioning member 611 is symmetrical by designing the positioning member 611 into a ring shape surrounding the first pivot 41 and the second pivot 42 distributed in different ways, can increase the stability of the first pivot 41 and the second pivot 42 when rotating, so that the user can operate more easily when adjusting the left and right positions of the armrest board 5 and rotating, increasing the convenience of use sex.

To sum up, so can really reach the purpose of the present invention.

The above is only an embodiment of the present invention, and should not limit the scope of the present invention with this, that is, all simple equivalent changes and modifications made according to the claims of the present invention and the contents of the description are still within the scope of this invention. the scope of the invention.

Claims (10)

1. An armrest device, comprising: a base, a fixing plate, and an armrest plate; It is characterized by: The armrest device also includes a pivot unit and a positioning unit; The fixing plate is arranged on the base and includes a first moving slot extending along a first direction; The pivot unit includes a first pivot and a second pivot arranged at intervals along a second direction that is not parallel to the first direction, the first pivot passes through the first moving slot and can move along the moving back and forth in the first moving groove in the first direction, and the second pivot is arranged on the fixing plate; The armrest board includes a sliding slot extending along the second direction and passing through the first pivot and the second pivot, the first pivot and the second pivot can slide along the second direction on the Sliding back and forth in the slot, whereby the armrest plate can move relative to the fixed plate along the second direction and rotate around the second pivot; The positioning unit includes at least one positioning module arranged on the pivot unit, and a positioning plate adjacent to the positioning module and having a magnetic attraction force between the positioning module, thereby, when the armrest plate moves relative to the fixed plate When one of the positioning module and the positioning plate is driven to move relative to the other, the magnetic attraction force will cause resistance against the movement of the armrest plate relative to the fixed plate. 2. The armrest device according to claim 1, wherein the fixing plate further comprises a second moving slot extending along the first direction and passing through the second pivot, and the second pivot can move along the The first direction slides back and forth in the second moving groove, whereby the armrest plate can move relative to the fixed plate along the first direction and rotate around the first pivot. 3. The armrest device according to claim 2, wherein the positioning unit comprises two positioning modules respectively disposed on the first pivot and the second pivot, the positioning modules are disposed adjacent to the positioning plate and There is a magnetic attraction force between them and the positioning plate, so that when the armrest plate moves relative to the fixed plate and drives at least one positioning module and one of the positioning plate to move relative to the other, the magnetic attraction force will cause resistance The resistance of the movement of the armrest plate relative to the fixed plate. 4. The armrest device according to claim 3, characterized in that: the positioning plate is arranged on the armrest plate, the first pivot has a first tooth formed on the peripheral surface around its own axis, and the second pivot There is a second tooth part formed on the peripheral surface around its own axis, and the positioning unit also includes two rack modules respectively meshing with the first tooth part and the second tooth part, and the tooth edge of each rack module The first direction is arranged so that when the first pivot and the second pivot move back and forth along the first direction, the first tooth portion and the second tooth portion are respectively engaged with the rack module, Make the first pivot and the second pivot rotate around their own axes simultaneously, and drive the corresponding positioning module to rotate relative to the positioning plate. 5. The handrail device according to claim 3, characterized in that: the positioning plate is arranged on the fixing plate, the first pivot has a first tooth formed on the peripheral surface around its own axis, and the second pivot There is a second tooth part formed on the peripheral surface around its own axis, the positioning unit also includes a rack module engaged with the first tooth part and the second tooth part, and the teeth of the rack module are along the second direction arranged so that when the first pivot and the second pivot move back and forth in the sliding groove along the second direction, the first tooth portion and the second tooth portion are engaged with the rack module, so that The first pivot and the second pivot rotate around their own axes simultaneously, and drive the corresponding positioning module to rotate relative to the positioning plate. 6. The armrest device according to claim 1, wherein the positioning module is disposed on the first pivot. 7. The armrest device according to claim 6, characterized in that: the positioning plate is arranged on the armrest plate, the first pivot has a first tooth formed on the peripheral surface around its own axis, and the positioning unit also includes a rack module engaged with the first tooth portion, the teeth of the rack module are arranged along the first direction, so that when the first pivot moves back and forth along the first direction, the first tooth portion and the The rack modules are engaged to make the first pivot rotate around its own axis at the same time, and drive the positioning module to rotate relative to the positioning plate. 8. The armrest device according to claim 6, characterized in that: the positioning plate is arranged on the fixing plate, the first pivot has a first tooth formed on the peripheral surface around its own axis, and the positioning unit also includes a rack module engaged with the first tooth portion, the teeth of the rack module are arranged along the second direction, so that when the first pivot moves back and forth in the sliding groove along the second direction, A tooth portion meshes with the rack module, so that the first pivot shaft rotates around its own axis at the same time, and drives the positioning module to rotate relative to the positioning plate. 9. The handrail device according to claim 1, characterized in that: the positioning module includes a positioning piece having the magnetic attraction force between the positioning plate and the positioning plate, one of the positioning piece and the positioning plate is made of magnetic material, and the other Those are ferromagnetic materials. 10. The armrest device according to claim 1, wherein the positioning module includes a positioning member sleeved on the first pivot and having the magnetic attraction force between the positioning plate, and a positioning member disposed on the first pivot When the first pivot rotates around its own axis, the first pivot drives the accommodating part to drive the positioning part to rotate relative to the positioning plate.