Boots – shoes – and leggings
Patent
1980-11-20
1983-06-07
Chin, Gary
Boots, shoes, and leggings
187 29R, 340 21, B66B 302
Patent
active
043874363
ABSTRACT:
A pulse generator is coupled to a car drive motor directly coupled to a sheave, over which a rope suspending an elevator car is passed, and the position of the car is calculated through the counting of pulses produced from the pulse generator. First and second car position detectors for detecting respective first and second car positions are provided within a hatchway, and the number of pulses produced during a period from the actuation of the first car position detector till the actuation of the second car position detector is detected. A count value for calculating the car position is corrected according to the difference between the detected pulse number and a reference pulse number corresponding to the distance between the first and second car position detectors, thereby effecting the compensation for the wear of the sheave and rope to improve the precision of the car position detection.
REFERENCES:
patent: 3589474 (1971-06-01), Wavre
patent: 3590355 (1971-06-01), Davis
patent: 3773146 (1973-11-01), Dixon, Jr. et al.
patent: 4108282 (1979-08-01), Satoh et al.
patent: 4134476 (1979-01-01), Zolnerovich, Jr. et al.
patent: 4141435 (1979-02-01), Satoh
patent: 4150734 (1979-04-01), Ohira et al.
patent: 4218671 (1980-08-01), Lewis
Hatakeyama Takanobu
Hokari Sadao
Katayama Yasunori
Kurihara Tomiaki
Meguro Toshio
Chin Gary
Hitachi , Ltd.
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