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US 4,736,144 AGranted
Automatic door being controlled with a servo-controlled safety protection device
OwnerHsu Chun-Puinventor
Life of this patent
Estimating the term…
Abstract
An automatic door, driven with a motor and a speed sensor, is controlled with a servo device. Upon the door being opened or closed and being stopped by an obstacle or being out of order, the motor to drive the door will be stopped; in case of the door being retarded by a wind force or other factors, the driving power of the motor will automatically be adjusted to such an extent that the door can still be closed together so as to fully use the driving power of the motor.
Claims6
An automatic door control system being controlled with servo-controlled safety protection device, comprising:
- an automatic door;
- a motor for opening and closing the automatic door;
- a speed sensor rotating synchronously with said motor to generate a synchronous signal;
- a rectifying circuit for converting the synchronous signal generated by said speed sensor into a DC signal;
- a voltage-comparison circuit for comparing the reference voltage of a reference voltage setting cirucit with said DC signal;
- a motor-power control circuit to be driven by an output signal from said voltage-comparison circuit;
- a power supply circuit for providing the device with power;
- an instantly varying voltage converting circuit which picks up a varying signal voltage from the power control circuit;
- an overload reference voltage setting circuit;
- an overload voltage comparison and amplification circuit for comparing said varying signal voltage and the voltage of said overload reference voltage setting circuit;
- an overload inductive voltage locking circuit;
- an operation condition control circuit for controlling the operation mode of said automatic door;
- a switch control circuit for sensing the opening, closing and stopping operations of said automatic door;
- and
- wherein said motor power control circuit controls the output power of said motor automatically until said DC signal equal to said reference voltage so as to run said motor steadily and increase the efficiency of said motor.
12 more elements
Dependencies are inferred from the claim text.