Title:
OIL PRESSURE TYPE ELEVATOR MODIFICATION METHOD
Document Type and Number:
Japanese Patent JP2014189398
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an oil pressure type elevator modification method capable of suppressing man hour and cost of piping work related to additional installation of a duplex check valve to minimum level, and improving reliability and maintainability of the installed duplex check valve.SOLUTION: An internal piping 13 for connecting a control valve unit 20 and a muffler 42 in a power unit 15 of the oil pressure type elevator is replaced to a duplex check valve unit 30 having a duplex check valve 31 and a stop valve 32.
Inventors:
NAKAMURA HIDEHIRO
WATANABE HARUO
WATANABE HARUO
Application Number:
JP2013069239A
Publication Date:
October 06, 2014
Filing Date:
March 28, 2013
Export Citation:
Assignee:
HITACHI BUILDING SYS CO LTD
International Classes:
B66B9/04; B66B7/00; F15B20/00
Domestic Patent References:
| JP2001253665A | 2001-09-18 | |||
| JPH0539184A | 1993-02-19 |
Other References:
JPN1010505500;
Attorney, Agent or Firm:
Patent business corporation Takekazu international patent firm