Vibratory massage therapeutic device

Claim 1

In an electrically powered vibrator massage therapeutic device the combination of a resilient supporting material encasing and supporting a plurality of electrically operable vibrator units the frequency of mechanical vibration of which is substantially the same as the frequency of electrical voltage applied thereto by an electrical power supply, and electrical power supply as aforesaid, the output voltage of which varies cyclically with time in accordance with the setting of preselectable control means, the power output of which is preselectable between a low level and the maximum allowable dissipation of the combination of vibrator units within the vibrator massage therapeutic device, the electrical power supply driving the said vibrator units; said vibrator unit including a stator having a permanent magnet with longitudinally oriented magnetic poles and stator casing of magnetically permeable material providing a return magnetic path for magnetic flux from one pole of the magnet to the other a driver coil assembly comprising a multiturn coil mounted on a tube which is adapted to vibrate with little friction longitudinally along the pole axis of the permanent magnet, the driver coil assembly remaining substantially within the stator, the outer surface of the coil assembly being of low friction material permitting substantially free vibration in cooperation with the inner liner of the stator casing, the upper section of the coil assembly being attached to a substantially rigid thin mechanical excitation plate wider than the stator casing, a flexible resilient material preventing contact of excitation plate and stator casing, a second mechanical excitation plate attached to the underside of the stator unit, the electrical excitation by time varying electrical power causing the driver coil assembly to vibrate correspondingly along the longitudinal magnetic axis.