| 摘要 |
An interlock arrangement for use with a sideloader fork lift truck includes a solenoid valve which when electrically energized is "open" to dump to sump hydraulic fluid from the output line of the hydraulic pump, whereby to prevent passage to the clutches of the power shift transmission of the pressurized hydraulic fluid from the pump, thereby rendering the power shift transmission ineffective to transmit motive power from the engine to the drive wheels of the sideloader vehicle. A limit switch is stationarily mounted contiguous the piston portion of each stabilizing jack, each limit switch being a normally closed switch which is adapted to be open only when the piston portion is in a predetermined properly retracted position. The limit switches associated with the plurality of stabilizing jacks are connected in parallel electrical relation with each other in the electrical circuit of the aforementioned solenoid valve, whereby the solenoid valve is energized to cause dumping of the hydraulic pump output to sump when the piston portion of any one of the stabilizing jacks is not in the predetermined properly retracted position. When the solenoid valve is electrically unenergized, due to the fact that the piston portions of all stabilizing jacks are properly retracted, the solenoid valve moves to a position in which the output pressure line of the pump is no longer connected to sump, and pressurized hydraulic fluid from the pump is available for pressurizing the clutches of the power shift transmission, whereby to permit transmission of motive power from the engine to the drive wheels of the sideloader vehicle.
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