Movable or removable closures – Plural wings radiate from common pivot; i.e. – revolving
Patent
1982-03-01
1984-10-09
Downey, Kenneth
Movable or removable closures
Plural wings radiate from common pivot; i.e., revolving
49 43, 109 8, E05D 1502
Patent
active
044753080
ABSTRACT:
A controller driven revolving door system has facing spaced apart curved panels partially enclosing three equiangularly spaced center shaft coupled wings and defining entry and exit openings. The controller automatically selectively directs traffic flow through the entry and exit openings and is responsive to a microwave motion detector at the entry and a mat switch in a quarter-point position accessable to the exit. A DC motor is coupled by a gearing assembly to the center shaft. The controller monitors current passing through the motor windings sensing shaft rotation. Responsive to the mat switch, the controller applies a resistive load to the DC motor windings to regeneratively brake the rotation of the door. The controller thereafter reverses the polarity of the motor windings causing the door to rotate in a reverse direction and back any individual out of the exit area. Drum edge switches on the curved panels sense interference with foreign objects to cause the controller to regeneratively brake, halting rotation of the center shaft. A handicapped person switch is provided to reduce motor current and reduce shaft rotation speed.
REFERENCES:
patent: 3497997 (1970-03-01), Sheckells
patent: 3526820 (1970-09-01), Sheckells
patent: 4063519 (1977-12-01), Pretini
patent: 4154023 (1979-05-01), Carroll
patent: 4289995 (1981-09-01), Sorber et al.
patent: 4295297 (1981-10-01), Carroll et al.
Blackston Michael D.
Heise Stanley R.
Parselle John L. B.
Zekich Michael B.
Downey Kenneth
Heise Manufacturing Co., Inc.
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