Title:
HYDRAULIC ELEVATOR DEVICE
Document Type and Number:
Japanese Patent JP3368554
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To relieve an emergency stopping operation shock by arranging a detent mechanism to mechanically hold an ascent or descent switching position switched by excitation even in an unexcited state, in an ascent/descent selecting solenoid valve.
SOLUTION: When a car 1 is operated so as to ascend, even if a solenoid device A being in an excited state is de-energized by power failure, since a detent mechanism 6C mechanically maintains an ascent switching position 6a, a check valve function of a main check valve 5 is held, and even if current- carrying to an inverter motor M is cut off by power failure, a hydraulic pump 4 is reduced in a speed by a certain inertia to smoothly reduce a delivery quantity. Since differential pressure between the upstream and the downstream of the main check valve 5 also smoothly reduces according to it, opening of the main check valve 5 is closed without a shock, so that the car 1 stops without a shock. Emergency stopping operation is maintained by a mechanical hold of the ascent switching position 6a to be made independent of a second shock adjusting throttle valve 16.
More Like This:
| WO/1998/034868 | METHOD AND DEVICE FOR CONTROLLING A HYDRAULIC LIFT |
Inventors:
Toshio Yoshino
Yasunori Ishikawa
Yasunori Ishikawa
Application Number:
JP6194598A
Publication Date:
January 20, 2003
Filing Date:
February 27, 1998
Export Citation:
Assignee:
Yuken Industry Co., Ltd.
International Classes:
B66B1/26; B66B9/04; (IPC1-7): B66B1/26; B66B9/04
Domestic Patent References:
| JP9315733A | ||||
| JP7267524A | ||||
| JP10203758A | ||||
| JP318072U |
Attorney, Agent or Firm:
Masatoshi Sato (1 person outside)