Title:
OPERATING DEVICE, AND ITS POWER STORING HOLD INSPECTION METHOD
Document Type and Number:
Japanese Patent JP3793067
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To recognize whether a spring for safety brake is held in a predetermined power storing state in an operating device.
SOLUTION: The decreasing rate of pressure detected by a pressure sensor 323 in inverting a motor 200 depends on whether a holding means normally holds the spring after the power storing of the spring. A controller 500 counts pulses while inverting the motor 200, and discriminates a holding failure and outputs a signal when the number of pulses until the pressure detected by the pressure sensor 323 lowers to a predetermined level not higher than a safety brake level is higher than a predetermined value.
Inventors:
Naoki Yamaguchi
Application Number:
JP2001319790A
Publication Date:
July 05, 2006
Filing Date:
October 17, 2001
Export Citation:
Assignee:
Nabtesco Co., Ltd.
International Classes:
B60T13/74; B60T13/04; B60T17/22; (IPC1-7): B60T13/74; B60T13/04; B60T17/22
Domestic Patent References:
| JP10194108A | ||||
| JP56146458A |
Foreign References:
| WO1998047750A1 |
Attorney, Agent or Firm:
Takafumi Watanabe