Harrison & Egbert
Massage chair drive mechanism
 A massage chair drive mechanism having a main body, a kneading shaft rotatably mounted transversely to the main body and having a gear affixed thereto, a spiral gear engaging the gear of the kneading shaft and rotatably mounted within the main body and having a face gear connected thereto, a beating shaft rotatably mounted transversely to the main body and having a gear affixed thereto, a worm gear rotatably mounted within the main body and engaged with the gear of the beating shaft and having a face gear at one end thereof, a main shaft rotatably mounted within the spiral gear and the worm gear and having opposite ends extending outwardly of the main body, a clutch positioned between the face gears of the respective worm gear and spiral gear and first and second moving rods positioned within the main body and moveable so as to engage portions of the clutch. The clutch includes a first tubular member and a second tubular member with a compression spring connected thereto and extending therebetween. The first and second tubular members are slidably positioned over a multisided middle section of the main shaft. The tubular member have respective clutch gears engageable with the face gears of the spiral gear and the worm gear. Each of the clutch gears having a circumferential trough and an arc-shaped trough. 
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inventional inventional additional additional additional
Yuan-Chuen
Chen