Abstract: An energy recovering system of a hydraulic lift device for a battery operated industrial truck. With the system, working oil can be supplied to other hydraulic actuators while energy recovering operation is performed by the hydraulic lift device, and energy recovering efficiency is increased. A hydraulic motor (6) is disposed in a fluid path for recovering pressurized working fluid from a lift cylinder (1) via a control valve (10) to a working fluid reservoir tank (8) so that the hydraulic motor (6) is driven by the pressurized working fluid returning from the lift cylinder (1). The hydraulic motor (6) is connected to an electric motor (4) for driving a hydraulic pump (3), which supplies pressurized fluid to the lift cylinder (1), by means of a one-way clutch (7) which performs torque transmission only from the hydraulic motor (6) to the electric motor (4).

Abstract: An energy recovering system in a hydraulic lift device of a battery operated industrial truck. With the system, working oil can be supplied to other hydraulic actuators while energy recovering operation is performed by the hydraulic lift device, occurrence of pressure pulsation in the working oil can be prevented, and energy recovering efficiency is increased. The hydraulic lift device comprises a lift cylinder (1) for lifting a fork F, an electric motor (4) rotated by power supply from a battery (5), a hydraulic pump (3) for supplying pressurized oil to the lift cylinder (1), a control valve (14) disposed in a pressurized oil supply path (23), and a controller (17).

Abstract: An energy recovering system of a hydraulic lift device for a battery operated industrial truck. With the system, working oil can be supplied to other hydraulic actuators while energy recovering operation is performed by the hydraulic lift device, and energy recovering efficiency is increased. A hydraulic motor (6) is disposed in a fluid path for recovering pressurized working fluid from a lift cylinder (1) via a control valve (10) to a working fluid reservoir tank (8) so that the hydraulic motor (6) is driven by the pressurized working fluid returning from the lift cylinder (1). The hydraulic motor (6) is connected to an electric motor (4) for driving a hydraulic pump (3), which supplies pressurized fluid to the lift cylinder (1), by means of a one-way clutch (7) which performs torque transmission only from the hydraulic motor (6) to the electric motor (4).

Abstract: In a lift truck of a type that, using a brake controller 20, a traveling motor 3 can be braked by an electromagnetic brake 17, the brake controller 20, when it detects the brake operation of a brake operation device, not only actuates the electromagnetic brake 17 but also detects the truck body weight and traveling speed of the lift truck, thereby electrically braking the traveling motor 3 in such a manner that the electric brake force can be increased or decreased in correspondence to whether the thus-detected truck body weight is heavy or light as well as the electric brake force can be increased or decreased in correspondence to whether the thus-detected traveling speed is high or low.

Abstract: In a load handling apparatus for a counterbalance type forklift, a single tiltable operating lever is disposed on a body of the forklift, a mast which is tiltable in an anteroposterior direction is disposed on the forklift, a liftable fork is disposed on the mast, and a tilting speed of the mast and lifting and lowering speeds of the fork are controlled by a degree of opening of a solenoid proportional control valve, the degree of opening being proportional to a tilting angle of the operating lever, and the operation of a switch, which is attached to the operating lever.

Abstract: A carrier signal generation section is provided for each of U, V, and W phases, and each of the carrier signal generation sections has an up-down counter for counting clock signals output from a clock generator. An initial value is set for each of the up-down counters. When the up-down counters are simultaneously started by method of a count start signal output from a CPU, the respective up-down counters start counting operations from the respective initial values, perform cumulative subtraction until the count value reaches an upper limit, and perform cumulative addition until the count value reaches a lower limit. As a result, triangular wave carrier signals Cu, Cv and Cw of respective phases having a predetermined phase difference can be readily generated with high accuracy.

Abstract: An interrupt signal is generated at each of rising timings of PWM signals which are produced on the basis of phase-shifted triangular wave carrier signals for phases, and voltage command values for the phases. At timings of the interrupt signals, A/D conversion of motor currents of the phases detected by a shunt is started. Interrupt signals are also produced at timings of valleys of the triangular wave carrier signals. Additionally, peak interrupt signals and valley interrupt signals are respectively produced at timings of peaks and valleys of triangular wave carrier signals for phases. Based on each of the peak interrupt signals, normality/abnormality of a switching element of an upper side of the phase corresponding to the interrupt signal is checked, and, based on each of the valley interrupt signals, normality/abnormality of a switching element of a lower side of the phase corresponding to the interrupt signal is checked.

Abstract: A forklift has a driving wheel capable of being steered by 360°, a steering angle detecting section for detecting a steering angle of the driving wheel, a rotary direction detecting section for detecting a rotary direction of the driving wheel, a running direction judging section for judging a running direction of the forklift based on the steering angle of the driving wheel and the rotary direction of the driving wheel. The forklift further includes a display, advancing chime and reversing buzzer for announcing the result of judgment obtained by the running direction judging section.

Abstract: An automated guided vehicle has plural conveyors for transferring materials to be transferred mounted on a self-propelling dolly and juxtaposed in a transverse direction. Each of the conveyors includes plural part conveyors whose operation can be controlled individually and arranged in tandem in a transferred direction. One or three or more part conveyors may be disposed or arranged in tandem in the direction of the vehicular width. One or three or more part conveyors may be disposed or juxtaposed in the transverse direction.

Abstract: A reach type forklift truck includes a rotation sensor interposed between a load wheel and a load wheel shaft on which the load wheel is provided. A signal line for transmitting a detected signal of the rotation sensor is inserted in a guide groove formed in the load wheel shaft that extends along an axial direction thereof. The signal line is led out from a reach rail side of the load wheel.

Abstract: Separately from a normal running mode, there is provided a turning mode in which a body (1) is allowed to turn. In the turning mode, road wheels (5a, 5b) and a driving wheel (8) are set such that the wheels are oriented so as to follow along a circumference R1 to R3 that would be formed about a distal end (B) of a fork arm (2b). As a result of this, the body (1) is allowed to turn about the distal end (B) of the fork arm (2b), whereby the body (1) can simply be positioned so as to confront the front of a pallet (40).

Abstract: A forklift has a travelling carriage, a straddle arm disposed on the travelling carriage, a mast disposed on the straddle arm to be reciprocally movable in a horizontal direction, a fork disposed on the mast to be movable up and down, and a cover disposed on the travelling carriage. When the mast is in a reach-in operation, the cover covers at least an upper side of an article supported by the fork.

Abstract: An information display apparatus for a vehicle including: a key switch for starting the vehicle; a setting operation portion for inputting and setting a plurality of start-up inspection items to be inspected as to operations of the vehicle before starting work; a display portion for displaying the start-up inspection items set by the setting operation portion; and a control portion which controls the display portion in response to turning on of the key switch thereby to display the startup inspection items on the display portion. The control portion controls the vehicle, on which a start-up inspection as to all the start-up inspection items are terminated, in a state of capable of performing work.

Abstract: A control apparatus includes a target acceleration obtaining device for obtaining a target acceleration of a hydraulic motor based on an operation amount of a lift lever; a torque command value obtaining device for obtaining a torque command value of a hydraulic motor based on the target acceleration; a determining device for determining as a non-regeneration state or as a regeneration state based the torque command value; and a change-over control device for changing over a change-over member so as to couple a lift cylinder to a flow rate control valve when determined as the non-regeneration state, and for changing over the change-over member so as to couple the lift cylinder to a hydraulic pump and making an inverter controller control the hydraulic motor in accordance with the torque command value when determined as the regeneration state.

Abstract: There is provided a forklift in which a mast upstands in front of the body of the forklift, a lift bracket is mounted on the mast in a vertically movable manner, and a fork is engaged with the lift bracket, wherein a laser light source which illuminates an area in front of the fork is attached to the lift bracket or the fork, and a light beam emitted from the laser light source is formed into a shape which laterally elongates, via a lens.

Abstract: An unqualified person driving prevention apparatus has a qualified person marker held by a person having driving qualification. This marker is continuously detected and when the marker is not detected, a predetermined measure to ensure safety is taken. The measure may be a warning to a driver through the sense of sight or the sense of hearing, or a driving stop of a vehicle. When the qualified person marker is detected during execution of the measure to ensure safety, the execution of the measure can be released.

Abstract: A forklift having a pallet lock device. On an upper face of a top end of a lock bar to lock a pallet, a tapered portion is disposed. When a fork is inserted into the pallet, the tapered portion comes into contact with an end face of the pallet and the lock bar rotates downward. When a landing sensor is turned on by a magnet disposed on the lock bar, the lock bar is immediately driven and the locking operation is started. Then, the top end of the lock bar pushes or comes into pressure contact with an upper face of a lower deck board of the pallet, and the pallet is locked.

Abstract: An automated guided vehicle has plural conveyors for transferring materials to be transferred mounted on a self-propelling dolly and juxtaposed in a transverse direction. Each of the conveyors includes plural part conveyors whose operation can be controlled individually and arranged in tandem in a transferred direction. One or three or more part conveyors may be disposed or arranged in tandem in the direction of the vehicular width. One or three or more part conveyors may be disposed or juxtaposed in the transverse direction.

Abstract: A forklift has a driving wheel capable of being steered by 360°, a steering angle detecting section for detecting a steering angle of the driving wheel, a rotary direction detecting section for detecting a rotary direction of the driving wheel, a running direction judging section for judging a running direction of the forklift based on the steering angle of the driving wheel and the rotary direction of the driving wheel. The forklift further includes a display, advancing chime and reversing buzzer for informing of the result of judgment obtained by the running direction judging section.

Abstract: A control apparatus includes a target acceleration obtaining means for obtaining a target acceleration of a hydraulic motor based on an operation amount of a lift lever; a torque command value obtaining means for obtaining a torque command value of a hydraulic motor based on the target acceleration; a determining means for determining as a non-regeneration state or as a regeneration state based the torque command value; and a change-over control means for changing over a change-over member so as to couple a lift cylinder to a flow rate control valve when determined as the non-regeneration state, and for changing over the change-over member so as to couple the lift cylinder to a hydraulic pump and making an inverter controller control the hydraulic motor in accordance with the torque command value when determined as the regeneration state.