Patent ID: 9316238
Filing Date: 2016-04-19
CPC Classification: B66C,F15B

Claim Text:
1. An apparatus for moving cargo comprising: a bus for transmission of electrical energy; at least one load connected to the bus, said at least one load configured to transform electrical energy from the bus into movement of a cargo with respect to the apparatus; energy transforming means configured to transform energy between electrical energy of the bus and potential energy of a hydraulic accumulator, wherein the energy transforming means comprises a variable displacement pump, wherein the apparatus is configured to: store electrical energy from the bus as potential energy to the hydraulic accumulator by the variable displacement pump supplying hydraulic fluid to the hydraulic accumulator for transforming electrical energy from the bus into potential energy of the hydraulic accumulator; supply the potential energy stored in the hydraulic accumulator as electrical energy to the at least one load; determine a rotational speed and displacement of the variable displacement pump for charging the hydraulic accumulator on the basis of the potential energy stored in the hydraulic accumulator; set the determined rotational speed to the variable displacement pump; and set the displacement gradually to the variable displacement pump.