Automatic horizontal positioning device for load handling vehicle

Claim 2

An automatic horizontal positioning device for a load handling vehicle having a plurality of outriggers equipped on front and rear portions on both sides thereof, comprising sensing means for sensing tilting of a body of the vehicle, means responsive to said sensing means to change over passages for supplying hydraulic pressure to said outriggers, and pressure responsive means responsive to the pressure in the outriggers to operate said change-over means, said pressure responsive means comprising a pressure switch in the conduit communicating with a head end chamber of each vertical outrigger; thereby when said vehicle body is tilted or said outriggers are floating said sensing means causes the required outriggers to operate to maintain said vehicle body in its horizontal position.

Claim 3

An automatic horizontal positioning device for a load handling vehicle as set forth in claim 1, wherein said sensing means comprises a bracket fixed to a rear body of the vehicle and having at its upper end a horizontal portion from which a weight is rockably suspended by means of a hook to form slight clearances between the peripheral surface of the weight and contacts of limit switches arranged correspondingly to the positions of said outriggers.

Claim 4

An automatic horizontal positioning device for a load handling vehicle as set forth in claim 1, wherein said means responsive to said sensing means comprise magnetic valves including solenoids.

Claim 5

An automatic horizontal positioning device for a load handling vehicle having a plurality of outriggers equipped on front and rear portions of both sides thereof, comprising a bracket upstandingly fixed to a stationary base mounted on a body of the vehicle, a weight rockably hanging from said bracket, limit switches arranged around said weight correspondingly to the positions of respective outriggers to form slight clearances between said weight and contacts of said limit switches when said vehicle body is horizontal, magnet valves included in respective conduits for supplying pressurized fluid to said outriggers for changing over the oil passageways to the head end and rod end chambers, each of said limit switches being included in the electric circuits of said magnet values, and pressure switches responsive to the increase in hydraulic pressure in the respective head end chambers of said outriggers, so that when said vehicle body is tilted or said outriggers are floating said limit switches cause the required outriggers to operate to maintain said vehicle body in its horizontal position.

Claim 6

An automatic horizontal positioning device for a load handling vehicle having a plurality of outriggers equipped on front and rear portions of both sides thereof, comprising a bracket upstandingly fixed to a stationary base mounted on a body of the vehicle, a weight rockably hanging from said bracket, limit switches arranged around said weight correspondingly to the positions of respective outriggers to form slight clearances between said weight and contacts of said limit switches when said vehicle body is horizontal, magnet valves included in respective conduits for supplying pressurized fluid to said outriggers for changing over the oil passageways to the head end and rod end chambers, each of said limit switches being included in the electric circuits of said magnet values, and pressure switches responsive to the increase in hydraulic pressure in the respective head end chambers of said outriggers, so that when said vehicle body is tilted or said outriggers are floating said limit switches cause the required outriggers to operate to maintain said vehicle body in its horizontal position.