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Backrest and armrest synchronous adjustment device for a massage chairBackrest and armrest synchronous adjustment device for a massage chair description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070120408, Backrest and armrest synchronous adjustment device for a massage chair. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] 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. [0003] 2. Description of the Prior Art [0004] 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: [0005] 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. [0006] 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. [0007] The present invention has arisen to mitigate and/or obviate the afore-described disadvantages. SUMMARY OF THE INVENTION [0008] 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. [0009] 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 [0010] FIG. 1 is a front view of an armrest and backrest synchronous adjustment device for a massage chair in accordance with the present invention; [0011] FIG. 2 is a side view of the armrest and backrest synchronous adjustment device for a massage chair in accordance with the present invention; [0012] FIG. 3 is an exploded view of an armrest in accordance with the present invention; [0013] FIG. 4 is an assembly view of the armrest in accordance with the present invention; [0014] 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; [0015] 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; [0016] FIG. 7 is an exploded view of a slide track structure of the armrest in accordance with the present invention; and [0017] FIG. 8 shows another slide track structure of the armrest in accordance with the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0018] 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. [0019] 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. [0020] 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. 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