Electricity: motive power systems – Motor-reversing – Periodic- or intermittent-reversing
Patent
1978-01-19
1980-11-18
Smith, Jr., David
Electricity: motive power systems
Motor-reversing
Periodic- or intermittent-reversing
318286, 318468, 318739, G05D 320
Patent
active
042348331
ABSTRACT:
The shaft driven by a reversible motor for opening and closing a door is provided with at least one reflective surface. An optical source/detector senses rotation of the shaft and generates a pulse each time one of the reflective surfaces passes. A programmable counter circuit counts the pulses in one direction when the door is opened and de-energizes the motor when a predetermined count is reached without the use of mechanical switches. The counter is decremented when the door is closed, and de-energizes the motor when the count returns to zero. Any obstruction will cause the system to stop the door if sensed during opening, or to reverse the door's direction if sensed during closing. Provision is made to account for any "coasting" the door may experience due to inertia; and the system will also track and permit small changes in the closed position of the door, as might occur if snow accumulates beneath the door.
REFERENCES:
patent: 3427518 (1969-02-01), Cloup
patent: 3571685 (1979-04-01), Akins et al.
patent: 3891909 (1975-06-01), Newson
patent: 4006392 (1977-02-01), Catlett et al.
patent: 4035705 (1977-07-01), Petterson et al.
A. E. Moore Company, Inc.
Mutter M. K.
Smith Jr. David
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