Abstract: A massage device for a massage chair includes a frame on which first, second, and third actuation mechanisms are mounted. A tappet is connected to each of two first swaying mechanisms connected to an actuation portion of the first actuation mechanism. Two second swaying mechanisms are connected to an actuation portion of the second actuation mechanism and each includes a bracket. Each of two rocker arm mechanisms has a connecting portion fixed to one of the tappets and a rocker arm with rollers. A push portion is provided at each rocker arm. A pressure device is mounted between each push portion and one of the brackets. The pressure devices transmit movement from the second swaying mechanisms to the rocker arm mechanisms to proceed with massage movement. A pressure of each pressure device can be increased or released to increase massaging pressure of the rocker arms and to absorb shock.

Abstract: A height adjustable device includes two main bodies installed to correspondingly parallel each other, and a power device installed to move between the main bodies. Each main body has a long rack positioned at its one side, having teeth facing to those of another correspondingly. The power device has a main box, a power source set inside the main box, and plural guiding wheels. The power source is connected with shafts extending out of the main box to form as extended shafts that are respectively fixed with a gear to engage with the long racks to keep the main bodies moving up and down in mutually opposite directions, doubling a distance to be moved for using.