Electricity: motive power systems – Automatic and/or with time-delay means
Patent
1981-07-08
1983-05-10
Truhe, J. V.
Electricity: motive power systems
Automatic and/or with time-delay means
364513, 364107, 318466, 49 28, G05D 308
Patent
active
043832067
ABSTRACT:
A motor for operating the door is controlled for forward and reverse rotations and stoppage by a control circuit responsive to an operation command signal, an upper-lower limit signal, an obstruction detection signal and a maximum drive time over signal, thus controlling the door stepwise for opening, stoppage, closing, stoppage and opening in that order. Upon generation of an obstruction detection signal or a maximum drive time over signal during the closing operation, the control circuit controls the motor in a manner to open the door for a certain period of time, and subsequently upon application of an operation command signal, the control circuit is set in a manner to open the door again.
REFERENCES:
patent: 4263536 (1981-04-01), Lee et al.
patent: 4300660 (1981-11-01), Schoenmann et al.
patent: 4328540 (1982-04-01), Matsuoka et al.
Matsuoka Shigeru
Suzuki Mitsuo
Tokunaga Takeshi
Yamauchi Koji
Yonekura Seiji
Evans A.
Hitachi , Ltd.
Truhe J. V.
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