Land vehicles – Skates – Ball type roller skates
Patent
1995-02-21
1996-12-03
Rice, Kenneth R.
Land vehicles
Skates
Ball type roller skates
280 612, 280DIG1, 2807661, B60S 900
Patent
active
055800955
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a vehicle body levelling device for a working vehicle having outriggers.
BACKGROUND TECHNOLOGY
In a working vehicle having outriggers for stabilizing a vehicle body of a working vehicle such as a crane, it is necessary to maintain to level the vehicle body even on an inclined ground.
Accordingly, there is proposed a device for automatically levelling the vehicle body even on the inclined ground as disclosed in Japanese Patent Publication No. 2-30906.
However, when the vehicle body is levelled by the aforementioned conventional vehicle body levelling device for a working vehicle, it is necessary firstly to extend each hydraulic jack unit to its maximum, then, to contract each hydraulic jack unit so as to level the vehicle body in response to a signal issued by an inclination detector means, which causes such inconvenience that a working efficiency is lowered since it takes time from the start of operation to the completion of levelling of the vehicle body.
Further, since the conventional device starts the levelling control from the state where the hydraulic jack unit is in its maximum stroke to thereby lift the vehicle body to the maximum height, in ordinary case, the levelling control is frequently completed at the state where the vehicle body is lifted to its maximum.
As a result, the position of the center of gravity of the vehicle body becomes high, which makes the device unstable during the operation thereof.
The invention is made to improve such a drawback and to provide a vehicle body levelling device for a working vehicle having outriggers which is capable of levelling the vehicle body in a short period of time, and particularly to provide a vehicle body levelling device for a working vehicle having outriggers which is capable of levelling the vehicle body in a position where the center of gravity of the vehicle body is low.
DISCLOSURE OF THE INVENTION
To achieve the above objects, in a vehicle body levelling device for a working vehicle having outriggers provided at the front and rear of a self-propelled lower running body according to a first aspect of the invention, wherein the outriggers comprises outrigger arms which can be extended and contracted in the left and right directions thereof for stabilizing the vehicle body while in service, and jack cylinders provided at distal ends of the outrigger arms for vertically supporting the vehicle body, the vehicle body levelling device comprises a front to rear inclination detector for detecting an inclination of the vehicle body in the front to rear directions thereof, a left to right inclination detector for detecting an inclination of the vehicle body in the left to right directions thereof, outrigger length detectors for detecting lengths of the outrigger arms, and a controller for calculating whether the vehicle body is inclined in the front to rear or left to right directions thereof, calculating extension/contraction amounts of piston rods, which are necessary for levelling the vehicle body, of the jack cylinders provided on each outrigger arm, and controlling control valves provided on the jack cylinders in accordance with results of calculation.
With such an arrangement, it is possible to level the vehicle body in a short period of time even when the working vehicle operates on an inclined ground.
The vehicle body levelling device for a working vehicle having outriggers according to a second aspect of the invention further comprises a two-axis inclination detector for detecting inclinations of the vehicle body in the front to rear and left to right directions thereof, hydraulic pressure detectors provided on the jack cylinders for detecting hydraulic pressures in the jack cylinders, and a controller for calculating extension/contraction amounts of piston rods of the jack cylinders in accordance with inclinations of the vehicle body detected by the two axis inclination detector and for controlling individual outrigger valves provided on the jack cylinders such that hydraulic pressures of t
REFERENCES:
patent: 4913458 (1990-04-01), Hamilton
patent: 4991673 (1991-02-01), Ericsson
patent: 5117595 (1992-06-01), Brendel
patent: 5143386 (1992-09-01), Uriarte
patent: 5159989 (1992-11-01), Claxton
patent: 5312119 (1994-05-01), Schneider et al.
Kabushiki Kaisha Komatsu Seisakusho
Komatsu Mec Kabushiki Kaisha
Rice Kenneth R.
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