Boots – shoes – and leggings
Patent
1981-03-27
1983-05-31
Wise, Edward J.
Boots, shoes, and leggings
364513, 318266, 318466, 49 28, E05F 1510, H02H 7085
Patent
active
043863981
ABSTRACT:
An automatic door operation control apparatus is disclosed which comprises a door operating device a driving device for opening and closing the door, a condition detector for detecting a condition under which the movement of the door by the driving device is required to be discontinued, and a main control device for issuing a driving command to the driving device to actuate the same as required in response to a condition detection signal from the condition detector. The apparatus further comprises an auxiliary control device for stopping the operation of the driving device in the event that the main control device fails to issue a command to the driving device to stop the door movement within a predetermined length of time in response to the condition detection signal from the condition detector.
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patent: 3617835 (1971-11-01), Dreher et al.
patent: 4131830 (1978-12-01), Lee et al.
patent: 4156835 (1979-05-01), Whitney et al.
patent: 4187454 (1980-02-01), Ito et al.
patent: 4328540 (1982-05-01), Matsuoka et al.
patent: 4338553 (1982-07-01), Scott, Jr.
patent: 4347465 (1982-08-01), Goertler et al.
Matsuoka Shigeru
Suzuki Mitsuo
Tokunaga Takeshi
Yamauchi Koji
Yonekura Seiji
Hitachi , Ltd.
Wise Edward J.
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