JPH03116400U - - Google Patents

Description

[Brief explanation of drawings]

1 and 2 are a front view and a plan view of a lift vehicle equipped with an operation control device according to the present invention, and FIGS. 3 and 4 are front views showing a lifting device used in this lift vehicle. and cross-sectional view, 5th
6 are hydraulic circuit diagrams showing a schematic configuration of the operation control device. 2...Vehicle body, 4...Swivel base, 5...Boom, 7
, 8, 9...rail, 10...lifting device, 13...
... Chassis, 29 ... Winch, 29a ... Hydraulic motor, 30 ... Operation box, 35 ... Full contraction detection switch, 36 ... Extension regulation valve, 50 ...
Telescopic cylinder, 56, 57, 60...electromagnetic control valve.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A telescoping boom that is disposed on a vehicle body so as to be able to raise and lower at least, and has a base boom attached to the vehicle body and a tip boom that is extendable and retractable with respect to the base boom; a base boom rail disposed along the base boom, a distal boom rail disposed at the distal end of the distal boom, and a movable platform movable on the proximal and distal boom rails;
a driving means for moving the moving platform on the base end and the distal end boom rail, and when the distal end boom is substantially fully retracted, the lower end of the distal boom rail and the upper end of the proximal boom rail are provided. The movable base is movable between these two boom rails in close proximity, and the movable base is moved up and down by extending and contracting the end boom while the movable base is moved on the top boom rail. An operation control device for a lift work vehicle, comprising a movement regulating means that allows movement of the movable platform by the drive means only when the telescopic boom is almost fully retracted, and the movable platform is connected to the tip boom rail. 1. An operation control device for a lift work vehicle, comprising an extension regulating means that allows the telescoping boom to extend only when the telescoping boom moves upward. 2. The movement restricting means includes a fully retracted detection sensor that is disposed on the proximal boom and detects when the telescopic boom is almost fully retracted, and the extension restricting means is attached to the distal end boom rail. and an extension regulating valve for controlling hydraulic pressure supply to the telescoping cylinder of the telescoping boom;
The extension restriction valve normally prevents hydraulic pressure from being supplied to the telescopic cylinder, and is actuated by the movable base when the movable base moves onto the tip boom rail to allow hydraulic pressure to be supplied to the telescopic cylinder. 2. The operation control device for a lift vehicle according to claim 1, wherein the operation control device is configured as follows. 3. The movement restricting means includes a fully retracted detection sensor that is disposed on the proximal boom and detects when the telescopic boom is almost fully retracted, and the extension restricting means is disposed on the distal end boom rail. Claim characterized in that it has a movement detection sensor that is installed and actuated by the moving platform that has moved onto the tip boom rail to detect that the moving platform has moved onto the tip boom rail. The operation control device for a lift work vehicle according to item 1. 4. The movement regulating means includes a fully retracted detection sensor that is disposed on the base end boom and detects when the telescopic boom is almost fully retracted, and the extension regulating means is arranged on the base end boom rail. A movement detection sensor is disposed at the upper end and is turned on by the movable base when the movable base moves onto the top boom rail to detect that the movable base has moved onto the top boom rail. The operation control device for a lift vehicle according to claim 1, characterized in that: