Title:
PRESSURE INCREASING DEVICE FOR HIGH LIFT WORK VEHICLE
Document Type and Number:
Japanese Patent JP2018044659
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a pressure increasing device for a high lift work vehicle enabling a disadvantage at the pressure increasing device to be detected.SOLUTION: This invention relates to a pressure increasing device for a high lift work for use in supplying hydraulic fluid of which pressure is increased by a pressure increasing cylinder to a hydraulic tool comprising a supply fluid passage connecting a pressure increasing chamber of the pressure increasing cylinder with the hydraulic tool; a pressure increasing hydraulic passage for guiding the hydraulic fluid to a fluid chamber at a head side of the pressure increasing cylinder; a pressure decreasing fluid passage for use in guiding the hydraulic fluid to the fluid chamber at a rod side of the pressure increasing cylinder; a preloading electromagnetic changing-over valve connected to the supply fluid passage; a main loading electromagnetic changing-over valve that is connected to the pressure increasing cylinder and constituted to be changeable between a state in which the hydraulic fluid is supplied to the fluid chamber at the head side of the pressure increasing cylinder through the pressure increasing passage and a state in which the hydraulic fluid is supplied to the fluid chamber at the rod side of the pressure increasing cylinder through the pressure decreasing fluid passage; and pressure detecting means for detecting a pressure of the pressure increasing chamber. When the maximum pressure detected by the pressure detecting means is out of a specified pressure range, this state is detected as a disadvantage state.SELECTED DRAWING: Figure 8
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Inventors:
KAWAI KIYOTAKA
MIKI TOSHIHIKO
ASO YOSHINARI
MATSUMOTO TAKUYA
KAWAMATSU YUICHI
KUSANAGI NAOTO
MIKI TOSHIHIKO
ASO YOSHINARI
MATSUMOTO TAKUYA
KAWAMATSU YUICHI
KUSANAGI NAOTO
Application Number:
JP2016182127A
Publication Date:
March 22, 2018
Filing Date:
September 16, 2016
Export Citation:
Assignee:
TADANO LTD
International Classes:
F15B20/00; B66F11/04; F15B3/00; F15B11/028
Domestic Patent References:
| JPH0579003U | 1993-10-26 | |||
| JP2014020543A | 2014-02-03 | |||
| JP2002310101A | 2002-10-23 | |||
| JP2015514947A | 2015-05-21 | |||
| JP2007285365A | 2007-11-01 |
Attorney, Agent or Firm:
Yanouchi Foreign Patent Office
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