Importance

Loading Importance Indicators...

Abstract

A vehicle rerailing device for use in difficult climates and the full range of temperature conditions present in such climates comprising rerailing elements connectable to and acting on a derailed and possibly overturned vehicle and hydraulic means which can be operated over said full range of temperature conditions to operate the rerailing elements. Said hydraulic means comprises a hydraulic lift device which includes a plurality of pressure displacement cylinders, each with a displaceable piston in it, a pressure chamber at one side of the piston and a second chamber at the other side of the piston. A high pressure generating unit is connected with the pressure chamber. A vacuum generator is connected with the pressure chamber. A control valve determines whether the pressure chamber is pressurized or is at reduced pressure to shift the piston, respectively, to lift the load or to return unloaded. To assist return of the unloaded piston, the chambers behind the pistons of at least some of the cylinders are pressurized at a lower pressure and permit return of the piston despite the condition of the hydraulic fluid induced by low temperature. The control valves are at a control table and the low pressure connections for return of the pistons are also at the table.

Loading the Abstract Image...

First Claim