Backrest and armrest synchronous adjustment device for a massage chair

Abstract

An armrest and backrest synchronous adjustment device for a massage chair comprises a base, a backrest, at least two armrests and two rail members. The base is formed with a space. The backrest is pivoted on the base and located correspondingly to the space of the base. The armrests are pivoted to the base, and lower end of each of the armrests is located correspondingly to the space of the base. The rail members are mounted at the lower end of the armrests or the backrest and located in the space of the base, on each of the rail members is formed a slot that is used to rotate the armrests when the backrest is adjusted.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an adjustment device for a massage chair, and more particularly to a backrest and armrest synchronous adjustment device for a massage chair.

2. Description of the Prior Art

Most of the backrests of the existing massage chairs are adjustable and can be fixed at different angles, and the tilt angle of the backrest is usually controlled by an advanced electronic control system. However, these conventional massage chairs still have the following shortcomings that need to be improved:

Firstly, the armrest is inflexible and cannot be adjusted in response to the angle adjustment of the backrest, so that the user feels uncomfortable since his arms cannot be laid comfortably on the armrest if the backrest is reclined back.

Secondly, since different users use the massage chair, the users whose arms are relatively short, like the children and old people, will feel particularly uncomfortable due to their arms are too short to be rest on the armrest after the backrest is reclined back.

The present invention has arisen to mitigate and/or obviate the afore-described disadvantages.

SUMMARY OF THE INVENTION

The primary objective of the present invention is to provide an armrest and backrest synchronous adjustment device for a massage chair comprising a base, a backrest, at least two armrests and two rail members. The base is formed with a space. The backrest is pivoted on the base and located correspondingly to the space of the base. The armrests are pivoted to the base, and lower end of each of the armrests is located correspondingly to the space of the base. The rail members are mounted at the lower end of the armrests or the backrest and located in the space of the base, on each of the rail members is formed a slot that is used to rotate the armrests when the backrest is adjusted.

The present invention will become more obvious from the following description when taken in connection with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiments in accordance with the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front view of an armrest and backrest synchronous adjustment device for a massage chair in accordance with the present invention;

FIG. 2 is a side view of the armrest and backrest synchronous adjustment device for a massage chair in accordance with the present invention;

FIG. 3 is an exploded view of an armrest in accordance with the present invention;

FIG. 4 is an assembly view of the armrest in accordance with the present invention;

FIG. 5 is an operational view of showing the armrest and backrest synchronous adjustment device for a massage chair in accordance with the present invention;

FIG. 6 is another operational view of showing the armrest and backrest synchronous adjustment device for a massage chair in accordance with the present invention;

FIG. 7 is an exploded view of a slide track structure of the armrest in accordance with the present invention; and

FIG. 8 shows another slide track structure of the armrest in accordance with the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIGS. 1-4, an armrest and backrest synchronous adjustment device for a massage chair in accordance with the present invention is mounted on a massage chair 10 and comprises: a base 20, a backrest 30, two armrests 40 and two rail members 50.

The base 20 is a rack assembly fixed to the bottom of the massage chair 10 and is set firmly on the ground. The base 20 includes a narrow first rack 21 and a wide second rack 22, the first rack 21 is located within the second rack 22, and between the first and second racks 21 and 22 is formed a space A.

The backrest 30 is pivoted to the first rack 21 of the base 20 and is located correspondingly to the space A, and at both sides of the lower end of the backrest 30 are coaxially arranged two pivotal shafts 31 on each of which being mounted an extending rack 312 and a retainer 311.

The armrests 40 each includes a support portion 41, a pivot 42 and two positioning cylinders 43 sequentially mounted on an armrest rack 45 in a top down manner. The armrests 40 are pivoted on the second rack 22 by the pivot 42 and the slide sleeve 44, and the positioning cylinders 43 below the armrests 40 are located correspondingly to the space A of the base 20. Beneath the support portion 41 are sequentially arranged a positioning board 401, a partition board 402 and a base board 403 (as shown in FIG. 7), in the positioning board 401 and the partition board 402 are formed a plurality of slide tracks 411 (which are in the form of elongated holes in this embodiment) that are arranged in a crisscross pattern. On the partition board 402 and on the base board 403 are formed a plurality of protrusions 412 to be moveably inserted in the slide tracks 411. The support portion 41 is positioned on the armrest 45 via the slide tracks 411, and the user can use the crisscrossed slide tracks 411 to make the positioning board 401, the partition board 402 and the base board 403 move relative to one another, so that the support portion 41 can be adjusted to different positions to support the user's arm.

The rail members 50 are in the form of a board, each of the rail members 50 is mounted on the two positioning cylinders 43 below the armrest 40 and is located in the space A of the base 20. In each of the rail members 50 is formed a slot 51 for insertion of the pivotal shafts 31, and then the pivotal shafts 31 are moveably confined in the slot 51 of the rail members 50 by the retainers 311.

For a better understanding of the present invention, reference should be made to FIGS. 4-6, the backrest 30 is pivoted to the first rack 21 of the base 20, so that the backrest 30 can be adjusted automatically or manually to different angles according to the user's needs. Furthermore, at both sides of the lower end of the backrest 30 are coaxially arranged the pivotal shafts 31 on each of which being mounted an extending rack 312, the pivotal shafts 31 are moveably confined in the slots 51 of the rail members 50. Plus the armrests 40 are pivoted to the second rack 22 by the pivot 42 and the slide sleeve 44.

By such arrangements, the rail members 50 will rotate within the space A of the base 20 synchronously when the tilt angle of the backrest 30 is adjusted. Due to the rail members 50 are mounted on the two positioning cylinders 43 below the armrest 40, when the rails members 50 are driven by the pivotal shafts 31 to rotate within the space A, the rails members 50 will synchronously rotate the armrest 40. Meanwhile, the support portion 41 of the armrest 40 will be tilted towards the second rack 22, and with the help of the crisscrossed slide tracks 411, the support portion 41 can be adjusted to different positions in response to the tilt angle adjustment of the backrest 30, to support the user's arm.

It will be noted that another function of the present invention is that the slot 51 can be used to adjust the tilt angle of the armrest 40 due to the slot 51 is a slant slot. Furthermore, the slot 51 also can be formed in different curvatures or tilt angles, so as to change the tilt angle of the armrest 40.

Referring to FIG. 8, slide tracks of the armrest in accordance with another embodiment of the present invention are shown, wherein the positioning board 401, the partition board 402 and the base board 403 are also located below the support portion (not shown) of the armrest 40, and the slide tracks 411 (which are in the form of a slide rod) are arranged at the upper and lower sides of the partition board 402. In the positioning board 401 and the base board 403 are formed a plurality of holes 413 for insertion of the slide tracks 411. The support portion 41 is positioned on the armrest 45 via the slide tracks 411, and the user can use the crisscrossed slide tracks 411 to make the positioning board 401, the partition board 402 and the base board 403 move relative to one another, so that the support portion 41 can be adjusted to different positions to support the user's arm.

While we have shown and described various embodiments in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.

Claims

1. An armrest and backrest synchronous adjustment device for a massage chair comprising a base, a backrest, at least two armrests and two rail members;

wherein the base is formed with a space;

the backrest is pivoted on the base and located correspondingly to the space of the base;

the armrests are pivoted to the base, and lower end of each of the armrests is located correspondingly to the space of the base; and

the rail members are mounted at the lower end of the armrests or the backrest and located in the space of the base, on each of the rail members is formed a slot that is used to rotate the armrests when the backrest is adjusted.

2. The armrest and backrest synchronous adjustment device for a massage chair as claimed in claim 1, wherein

the base is fixed to a bottom of the massage chair and is set firmly on the ground, the base includes a narrow first rack and a wide second rack, the first rack is located within the second rack, and the space is formed between the first and second racks;

the backrest is pivoted to the first rack of the base, and at both sides of the lower end of the backrest are coaxially arranged two pivotal shafts;

the armrests are pivoted to the second rack; and

the rail members each is formed with the slot for insertion of the pivotal shafts, and the slot is used to rotate the armrests by cooperating with rotation of the pivotal shafts.

3. The armrest and backrest synchronous adjustment device for a massage chair as claimed in claim 2, wherein an extending rack is mounted on each of the pivotal shafts at both sides of the lower end of the backrest.

4. The armrest and backrest synchronous adjustment device for a massage chair as claimed in claim 3, wherein a retainer is mounted on each of the pivotal shafts at both sides of the lower end of the backrest, and the slot of the rail members is provided for insertion of the pivotal shafts, and then the pivotal shafts are moveably confined in the slot of the rail members by the retainer.

5. The armrest and backrest synchronous adjustment device for a massage chair as claimed in claim 4, wherein the armrests each includes a support portion, a pivot and two positioning cylinders sequentially mounted on an armrest rack in a top down manner, and the armrests are pivoted on the base by the pivot and a slide sleeve.

6. The armrest and backrest synchronous adjustment device for a massage chair as claimed in claim 1, wherein a positioning board, a partition board and a base board are arranged sequentially beneath a support portion, in the positioning board and the partition board are formed a plurality of slide tracks that are arranged in a crisscross pattern, with the crisscrossed slide tracks, the support portion can be adjusted to different positions in response to tilt angle adjustment of the backrest, to support the user's arm.

7. The armrest and backrest synchronous adjustment device for a massage chair as claimed in claim 6, wherein each of the crisscrossed slide tracks is in the form an elongated hole, on the partition board and the base board are formed a plurality of protrusions to be moveably inserted in the slide tracks, the support portion is positioned on the armrest via the slide tracks, and the user can use the crisscrossed slide tracks to make the positioning board, the partition board and the base board move relative to one another, so that the support portion can be adjusted to different positions to support the user's arm.

8. The armrest and backrest synchronous adjustment device for a massage chair as claimed in claim 6, wherein each of the crisscrossed slide tracks is in the form a slide rod arranged at the upper and lower sides of the partition board, in the positioning board and the base board are formed a plurality of holes for insertion of the slide tracks, the support portion is positioned on the armrest via the slide tracks, and the user can use the crisscrossed slide tracks to make the positioning board, the partition board and the base board move relative to one another, so that the support portion can be adjusted to different positions to support the user's arm.