Communications: electrical – Continuously variable indicating – With meter reading
Patent
1981-12-21
1983-05-24
Caldwell, Sr., John W.
Communications: electrical
Continuously variable indicating
With meter reading
34082569, 49 25, 318 16, G08C 1900
Patent
active
043852963
ABSTRACT:
A remote-controlled automatic door control apparatus includes a door, a driving unit connected to the door for driving the door to open and closed positions, and a control arrangement for controlling the door operation through the driving unit and including a radio communication system having a transmitter and a receiver. A signal containing a specific code transmitted from the transmitter is received by the receiver and collated with a code set previously in the receiver, and if they have a predetermined relationship with each other, an operation command is issued to the driving unit. The transmitter is capable of being set to a specific code, and the receiver includes a memory device for storing the specific code transmitted from the transmitter. A signal switching device is further provided for actuating the collating operation for collating the stored code with the signal from the transmitter under normal conditions and for storing a signal from the transmitter in the memory device if required.
REFERENCES:
patent: 3513443 (1970-05-01), Andersen
patent: 3625328 (1971-12-01), Carll
patent: 3906348 (1975-09-01), Willmott
patent: 4064487 (1977-12-01), Russell et al.
patent: 4141010 (1979-02-01), Umpleby et al.
Matsuoka Shigeru
Nakamura Kenji
Sunada Masayoshi
Tsubaki Toshio
Caldwell Sr. John W.
Crosland Donnie L.
Hitachi , Ltd.
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