Title:
WORKING VEHICLE
Document Type and Number:
Japanese Patent JP2670007
Kind Code:
B2
Abstract:
PURPOSE: To improve safety and also facilitate emergency operation, by giving operating current for stopping the rise of a boom when the boom is risen to set height by an electric command means controlling the operation of an electric type pressure-reducing valve.
CONSTITUTION: A pilot operating device 16, operating a control valve VC to a boom cylinder C6 is constituted so that pilot operating oil pressure can be freely changeably operated by operating a human-initiated lever 17. An electric type pressure reducing valve 21, reducing pilot pressure by returning at least part of the pilot operation oil of an operating oil path to a return oil path to a hydraulic tank, is provided on the operating oil path, in which pilot pressure from the pilot operating device 16 is transmitted to the operating part 15 for a control valve VC. An electric type command means 18, capable of outputting operating current controlling the operation of the electric type pressure-reducing valve 21, is provided; and when a boom is risenly driven to set height, operating current, pressure-reducibly operating the electric type pressure-reducing valve 21, is given so as to stop the rise of the boom, improving safety.
Inventors:
Akira Tsuda
Application Number:
JP22408693A
Publication Date:
October 29, 1997
Filing Date:
September 09, 1993
Export Citation:
Assignee:
Kubota Corporation
International Classes:
E02F9/20; F15B20/00; (IPC1-7): F15B20/00; E02F9/20
Domestic Patent References:
| JP61266803A | ||||
| JP50107388A | ||||
| JP6011704A | ||||
| JP50150159A | ||||
| JP4950372A | ||||
| JP4898440A | ||||
| JP5179881A | ||||
| JP51148824A | ||||
| JP4895363U | ||||
| JP50114905U |
Attorney, Agent or Firm:
Kitamura Osamu
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