Patent ID: 8500662
Filing Date: 2013-08-06
Classification: A61F,A61H

Abstract:
1. A power device for visual care, comprising a power unit, a piston unit, a pneumatic cylinder, a guide member and a circuit control panel, the power unit comprising a motor and a power screw driven by the motor, the piston unit comprising a screw seat and a piston, the screw seat having a threaded hole for insertion of the power screw, the pneumatic cylinder being fitted on the piston and the screw seat of the piston unit, the pneumatic cylinder having a guide slot disposed on one side thereof, the guide member being inserted in the guide slot and fixed to the screw seat, the circuit control panel being fixed to the side having the guide slot of the pneumatic cylinder, the circuit control panel having a notch corresponding in position to the guide slot, the circuit control panel comprising a homing sensor, a positive air pressure micro switch and a negative air pressure micro switch which are located close to the notch and respectively correspond to a homing position, an utmost positive air pressure position and an utmost negative air pressure position of the piston unit, the guide member comprising an inductive part which has a bent section facing the homing sensor, wherein, when the power unit is activated, the power screw drives the piston unit to bring the inductive part of the guide member to the homing sensor for a return-to-zero setting and to bring the guide member to touch the positive air pressure micro switch and the negative air pressure micro switch and return to the homing sensor so as to provide positive air pressure and negative air pressure for visual care.