Title:
BOOM INTERLOCK DEVICE OF SERVICE CAR
Document Type and Number:
Japanese Patent JP2014156314
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To enable a boom interlock function to be attained by a low-cost and high-reliable hydraulic pilot system only by adding a simple pilot circuit in a hydraulic circuit.SOLUTION: This device has boom storage state detection means and a pilot circuit 4 that operates the switching of an unload valve 7, and is provided, in the pilot circuit 4, with a solenoid valve 41 that opens by boom unstored state detection signals from the boom storage state detection means 21, pilot valves 49A and 49B that open by interlocking with the jack contracting operation of operation switching valves 39A and 39B of jack contracting actuators 19A and 19B, so that a boom interlocking function can be attained by pilot hydraulic pressure.
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| WO/2024/038096 | TRUCK-MOUNTED CONCRETE PUMP |
Inventors:
SATOHIGASHI SUEKAZU
Application Number:
JP2013027921A
Publication Date:
August 28, 2014
Filing Date:
February 15, 2013
Export Citation:
Assignee:
TADANO LTD
International Classes:
B66C23/78; B66C23/90; F15B20/00
Domestic Patent References:
| JPH09249386A | 1997-09-22 | |||
| JPH09255286A | 1997-09-30 | |||
| JP2000087903A | 2000-03-28 | |||
| JP2000128486A | 2000-05-09 |
Attorney, Agent or Firm:
Koji Shirakawa
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