Back massage device provided to chair type massage machine and chair type massage machine with same

Abstract

A back massage device capable of causing a massage mechanism to protrude forward and returning the massage mechanism to the original position, wherein the back massage device is configured so that the massage effect does not deteriorate, the massage mechanism can be moved forward and backward a sufficient amount, and the back massage device is not mechanically large and complex. A back massage device (4) provided to a chair type massage machine (1) is provided with: a massage mechanism (10) having a pair of left and right massage members (17); a base member (12) for pivotably supporting the mechanisms (10) at the lower end side thereof; a vertical movement mechanism (13) for vertically moving the base member (12); an extension / retraction operation mechanism (14) for driving and rocking the massage mechanism (10); and a rocking limiting mechanism (15) for limiting the pivoting angle of the massage mechanism (10) so that, at a raised position, the upper ends of the massage members (17) protrude forward and, at a lowered position, the lower ends of the massage members protrude forward.

Description

technical field [0001] The present invention relates to a back rubbing device provided on a chair type massage machine and a chair type massage machine provided with the back rubbing device. Background technique [0002] There is known a backrest on a chair type massage machine, in which a massage mechanism is installed to make a pair of left and right massage parts perform massage actions. [0003] This massage mechanism needs to move along the spine of the user sitting on the seat, so a vertical movement mechanism for this movement is provided, and the massage mechanism and the vertical movement mechanism constitute the back rubbing device. [0004] Someone proposes to set an advance and retreat action mechanism on this back rubbing device (for example, see Patent Document 1), so that the massage parts can be protruded forward or returned to the original normal position according to needs or user's preference. . [0005] This advance and retreat action mechanism is to se...

AI Technical Summary

Problems solved by technology

This problem is also related to the low finger pressure (massage effect) of the massage mechanism and the deviation of the finger pressure position.

In addition, there are noise problems caused by air flow and exhaust sound, etc.

[0010] In the case of the connecting rod method, the difficulty is that a pair of connecting rods are required, and a helical shaft having a forward thread portion and a reverse thread portion is indispensable, so that the cost of the parts is high

Not only that, but the helical shaft is very long, which also leads to the bulky size of the back kneading device as a whole

[0011] The fundamental problem of the cam method is that the forward and backward movement stroke of the massage mechanism cannot be increased because a large cam eccentricity cannot be ensured.

On the other hand, if the eccentricity of the cam is increased in order to increase the forward and backward movement stroke, not only the back rubbing device, but also the backrest of the chair type massage machine will become bulky (thickened), and cannot be used.

In addition, since the cam and the supporting member form a fitting relationship through the bearing, once the user pushes back (leaning load) when the massage mechanism protrudes forward, sliding rotation occurs between the cam and the supporting member. , the result is the same as when using the air chamber, causing the massaging mechanism to be pushed back

[0012] When the lever method is used, the reduction ratio caused by the worm wheel and the helical gear is fundamentally and fatally increased, so the movement of the forward and backward mechanism is very slow, and as a result, the massage mechanism can only move forward and backward at a low speed

Therefore, for example, when a series of massage actions are performed as a chair-type massage machine as a whole, the cycle time will be prolonged in vain.

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