A center of gravity estimation device includes a tilt cylinder pressure sensor detecting a pressure on a rod side of the tilt cylinder, a tilt cylinder pressure sensor detecting a pressure on a bottom side of the tilt cylinder, a lift cylinder pressure sensor detecting a pressure of a lift cylinder, and an electronic control unit performing estimation calculation of a center of gravity of a cargo W loaded on a fork using the pressure on the rod side of the tilt cylinder, the pressure on the bottom side of the tilt cylinder, the pressure of the lift cylinder, and data on a structure of a cargo handling device.

A forklift truck includes a carriage that moves up and down by a mast assembly in a multi-stage structure including an outer mast, a first inner mast accommodated in the outer mast, and a second inner mast accommodated in the first inner mast. The forklift truck includes a first lift cylinder configured to move the first inner mast up and down; a second lift cylinder configured to move the second inner mast up and down and having a pressure reception area less than a pressure reception area of the first lift cylinder. A first lift hydraulic line supplies hydraulic oil to the first lift cylinder. A second lift hydraulic line supplies hydraulic oil to the second lift cylinder. A pressure regulating valve is provided to increase a pressure of the hydraulic oil to a pressure capable of driving the second lift cylinder.

A forklift truck includes a carriage that moves up and down by a mast assembly in a multi-stage structure including an outer mast, a first inner mast accommodated in the outer mast, and a second inner mast accommodated in the first inner mast. The forklift truck includes a first lift cylinder configured to move the first inner mast up and down; a second lift cylinder configured to move the second inner mast up and down and having a pressure reception area less than a pressure reception area of the first lift cylinder. A first lift hydraulic line supplies hydraulic oil to the first lift cylinder. A second lift hydraulic line supplies hydraulic oil to the second lift cylinder. A pressure regulating valve is provided to increase a pressure of the hydraulic oil to a pressure capable of driving the second lift cylinder.

The present invention involves a narrow aisle truck comprising: a vehicle body having length and width directions; wheels assigned to the vehicle body and arranged on two axes running in the width direction and configured to drive and steer the truck; a drive system configured to exert an acceleration torque on at least one of the wheels; a mast extending substantially vertically with respect to the length direction of the vehicle body between the two axes; at least one detection unit to detect at least one state parameter; at least one actuator to cause a movement of the mast relative to the vehicle body; and a control unit to: determine a current state, determine an effect of an actuation of the at least one actuator on the current state, and activate the at least one actuator to reduce a difference between the determined current state and a predetermined target state.

The present invention involves a narrow aisle truck comprising: a vehicle body having length and width directions; wheels assigned to the vehicle body and arranged on two axes running in the width direction and configured to drive and steer the truck; a drive system configured to exert an acceleration torque on at least one of the wheels; a mast extending substantially vertically with respect to the length direction of the vehicle body between the two axes; at least one detection unit to detect at least one state parameter; at least one actuator to cause a movement of the mast relative to the vehicle body; and a control unit to: determine a current state, determine an effect of an actuation of the at least one actuator on the current state, and activate the at least one actuator to reduce a difference between the determined current state and a predetermined target state.

A work vehicle includes a vehicle frame which is supported by first and second axles. A driver's cab, a lifting arm, and at least one electrical energy store unit are supported on the vehicle frame. The lifting arm is arranged along a longitudinal direction of the work vehicle parallel to a longitudinal axis of the vehicle frame. The driver's cab is arranged to a first side of the longitudinal axis between the two axles. The at least one energy store unit is arranged between the two axles to a second side of the longitudinal axis, which is situated opposite the first side.

A system for parasitic power generation and control of a load-handler configured to be coupled to a lift truck, with a parasitic energy convertor mounted on the load-handler and coupled via a hydraulic feed line to a hydraulic pump on the lift truck. The parasitic energy convertor configured to generate electrical power for components of the load-handler, including a load-side control transceiver. The load-side control transceiver is configured for controlling control valves based on commands received wirelessly from a truck-side control transceiver. The load-side control transceiver configured for monitoring and control of the load-handler including event logging and notification of maintenance needed.

A system for parasitic power generation and control of a load-handler configured to be coupled to a lift truck, with a parasitic energy convertor mounted on the load-handler and coupled via a hydraulic feed line to a hydraulic pump on the lift truck. The parasitic energy convertor configured to generate electrical power for components of the load-handler, including a load-side control transceiver. The load-side control transceiver is configured for controlling control valves based on commands received wirelessly from a truck-side control transceiver. The load-side control transceiver configured for monitoring and control of the load-handler including event logging and notification of maintenance needed.

An industrial driver apparatus includes a forklift hydraulic motor, a drive shaft adapter, a hydraulic pump, and a frame. The forklift hydraulic motor includes a housing and a drive shaft. The drive shaft adapter is coupled to the drive shaft of the forklift hydraulic motor and adapts the drive shaft of the forklift hydraulic motor to a dimension of a threaded component being driven by the forklift hydraulic motor. The hydraulic pump pressurizes a hydraulic fluid used to drive the forklift hydraulic motor. The frame is coupled to a housing of the forklift hydraulic motor and prevents the forklift hydraulic motor from rotating while the drive shaft rotates the threaded component.

Load-handling vehicle comprising: a load-handling member, a jack (4) for lifting the load-handling member, comprising a lifting chamber (5) and a lowering chamber (6), a fluid source (7), a first fluid connection (8) from the lifting chamber (5) to the source (7), a second fluid connection (9) from the lowering chamber (6) to the source (7), the first connection (8) comprising a safety valve (10) that is open in the direction of the fluid source (7) towards the lifting chamber (5), and that is normally closed in the direction of the lifting chamber (5) towards the fluid source (7). A valve (11) arranged on the second link (9) is sensitive to the pressure of the portion of the first link (8) extending between the valve (10) and the source (7), and a unidirectional fluid circulation line (12), which can be closed according to the pressure weighing on the portion of the second fluid connection (9) between the valve (11) and the source (7), connects the first and second connections (8, 9).