Easy opening door control device

Details Easy opening door control device Easy opening door control device

1992-03-23

1993-03-16

Herrmann, Allan D.

Motors: spring, weight, or animal powered

Spring

With winding means

16 49, 16 64, 49386, 74 8917, 318376, 318760, F03G 100, E05F 300, F16H 1904

Patent

active

051936470

ABSTRACT:
A device for controlling swinging doors utilizing an externally powered motor to compress a spring during door opening to store energy in the spring. The motor is not used to open the door, but only to compress the spring, thereby utilizing a minimum amount of electrical energy and allowing for a very easy opening of the door. The motor acts as a generator during the closing of the door with generated electrical energy fed back to the motor to retard rotation of the rotor, providing a brake on the closing movement of the door. The feedback circuitry includes a switch for varying the braking during the final degrees of closing movement as well as a variable setting device allowing control of braking force.

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