Title:
CONSTRUCTION MACHINE
Document Type and Number:
Japanese Patent JP2019074188
Kind Code:
A
Abstract:
To provide a construction machine which can lock an operation from the outside at desired timing.SOLUTION: A construction machine comprises a hydraulic pilot valve 40 for changing pilot pressure, and drive means for changing a state of the hydraulic pilot valve 40. The hydraulic pilot valve 40 has: a valve case 42; a spool 44 arranged in the valve case 42, stroking according to an operation amount from the outside, and changing the pilot pressure according to a position in a stroke direction; a spring seat 43 arranged in the valve case 42, and moving the spool 44 to a prescribed direction by moving to the prescribed direction being one direction of the stroke direction according to the operation amount from the outside; and a piston 50 which can limit the movement of the spring seat 43 to the prescribed direction by directly contacting with the spring seat 43 when located in a limit position in front of the spring seat 43 in the prescribed direction. The drive means positions the piston 50 at the limit position at prescribed timing.SELECTED DRAWING: Figure 2
Inventors:
TERAUCHI KENICHI
SAKAGUCHI NOBUYA
SAKAGUCHI NOBUYA
Application Number:
JP2017202522A
Publication Date:
May 16, 2019
Filing Date:
October 19, 2017
Export Citation:
Assignee:
KOBELCO CONTSTRUCTION MACHINERY LTD
International Classes:
F16K35/00; E02F9/20; F16K31/524; G05G5/02; G05G5/03
Attorney, Agent or Firm:
Kaji/Suhara Patent Office