| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve a problem that uncomfortable ride and an elevator car does not stop quickly upon occurrence of failure. <P>SOLUTION: In a hydraulic elevator system, when the car 1 normally moves upwardly, a first electromagnetic valve 15 and a second electromagnetic valve 20 are demagnetized, a valving element 52 opens by a pressure oil from a power unit 10, and, when the car 1 normally moves downwardly, the first electromagnetic valve 15 and the second electromagnetic valve 20 are excited, thereby the valving element 52 opens by releasing a pressure oil in a valving element back pressure chamber 19 to a power unit 10 side, and, when the car 1 abnormally moves downwardly, the first electromagnetic valve 15 and the second electromagnetic valve 20 are demagnetized, thereby the valving element 52 are closed to stop downward movement of the car 1, and, when the car 1 of the valving element 52 stops, a slight amount of the valving element 52 is held by an opening holding body 30, the power unit 10 communicate with the hydraulic jack 5. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
