Patent ID: 7022091

Claim:
In a massaging chair having a frame with two guiding tracks mounted respectively on opposite sides of the frame; an assembly board securely mounted between the two guiding tracks to accommodate therein a transmission assembly, wherein the transmission assembly comprises an integral transmission casing having a longitudinal passage and two latitudinal passages in communication with the longitudinal passage; a first motor mounted on a bottom portion of the assembly board; a threaded axle extending through the assembly board to be driven by the first motor; an inner board provided on opposite sides of the assembly board to pivotally connect to a first latitudinal shaft, a second latitudinal shaft and a third latitudinal shaft; the first latitudinal shaft extending through an assembly seat and having two driving plates provided on opposite sides of the first latitudinal shaft; the second latitudinal shaft and the third latitudinal shaft extending through the latitudinal passage in the transmission casing to connect to an assembly device that is driven by the driving plates on the first latitudinal shaft; and a longitudinal shaft extending through the longitudinal passage in the transmission casing to be driven by a second motor and provided with a worm shaft to mate with a worm gear on the second latitudinal shaft and a slanted gear to mate with a gear on the third latitudinal shaft so that when the longitudinal shaft is rotated by the second motor, the second longitudinal shaft and the third latitudinal shaft are rotated; and a unidirectional bearing provided between the worm shaft and the slanted gear to allow the second latitudinal shaft and the third latitudinal shaft to either rotate simultaneously or differently with respect to each other.