Abstract: A system for real time three-dimensional model display in a machine tool includes a plurality of motors each capable of providing relative movement between a tool and a workpiece along an associated one of multiple axes, a servo driver for controlling the motors, a numerical controller coupled to the servo driver for transmitting target three-dimensional coordinates of points stored in a memory to the servo driver such that the motors can be caused to move into the target coordinates of points and for receiving actual three-dimensional coordinates of points fed back from the motors, and an image processor for receiving the actual three-dimensional coordinates of points from the numerical controller and for directly transmitting the actual three-dimensional coordinates of points to a display screen, so as to achieve a real time workpiece shape display based on the actual three-dimensional coordinates of points of the motors.

Abstract: A semi-automatic power shift transmission for use in a forklift truck includes a manual shift lever with first and second gear positions, a hydraulically shifted transmission gear mechanism operable in one of first and second gear ratios corresponding to the first and second gear positions, a plurality of solenoids for, when energized, causing the transmission gear mechanism to be either up-shifted from the first to the second gear ratio or down-shifted from the second to the first gear ratio, a transmission speed sensor for detecting the output speed of the transmission gear mechanism to generate a transmission speed signal, an engine speed sensor for picking up the speed of a vehicle engine to produce an engine speed signal, a steering wheel angle sensor for measuring the steering wheel angle to issue a wheel angle signal, and a transmission control unit responsive to the transmission speed signal, the engine speed signal and the wheel angle signal for selectively energizing the solenoids to thereby carry o

Abstract: A spool-out type booster brake valve device for industrial vehicles is configured to allow hydraulic working fluid to be supplied not only to a booster chamber but also to a master chamber thereby eliminating the need to use a separate brake fluid reservoir tank for supplementing brake fluid in the master chamber. The brake valve device is used in an industrial vehicle equipped with a fluid pump, a reservoir tank and a brake actuator. The brake valve device includes a valve body having an inlet port, a drain port, a brake port, a booster chamber communicatable with the pump via the inlet port and a master chamber communicatable with the brake actuator via the brake port. The master chamber is connected to the inlet port to receive working fluid from the pump. A valve spool is slidably fitted in the valve body through the booster chamber and the master chamber, the valve spool being shifted between an idle position and an operating position.

Abstract: A loader with a controlled vertical path of a working implement comprises a frame and a pair of laterally spaced lift booms disposed at opposite lateral sides of the frame for elevational movement between lowered and raised positions, each of the lift booms having a forward free end which carries a working implement and a rear proximal end articulately mounted to the frame. A pair of front control links are arranged on the opposite sides of the frame, each of the front control links having a first end pivotally attached to the frame at a first pivot point and a second end pivotally connected to the rear proximal end of the respective lift boom at a first connection point.

Abstract: A fire grate assembly for stoker incinerators. A plurality of stationary and movable grate members are alternately arranged in the assembly. The assembly also has a preventing member, such as a liner plate, which is detachably mounted to an end of each of the movable grate members for preventing the stationary grate members and the movable grate members from directly contacting each other, while allowing the movable grate members to be linearly movable relative to the stationary grate members. The preventing member is replaceable and can have a countersunk hole, thus being adapted for bolting the end of each of the movable grate members.

Abstract: A bulk material pump device includes first and second hydraulic drive cylinders capable of causing alternate reciprocating movement of the corresponding pumping pistons to pump concrete contained in a hopper through a transportation conduit. The first drive cylinder has a cylinder housing whose bore is divided into a base chamber and a head chamber by a drive piston slidably received in the cylinder housing. The base chamber is in fluid communication with an oil pump while the head chamber is connected to the second drive cylinder. Under a loaded operation condition, a part of the pressurized oil in the base chamber is admitted into the head chamber via a head bypass line at the end of retracting movement of the drive piston and almost the same amount of the oil is returned back from the head chamber to the base chamber via a base bypass line at the end of extending movement thereof.

Abstract: A loader which can provide the operator with enhanced safety comprises a vehicle body carrying a canopy and a rotating vehicle axle, a seat bar mounted to the canopy for swinging movement between a raised position and a lowered, operator restraint position, a parking lever shiftable between a brake position and a release position and cooperatingly associated with the seat bar, an axle lock operatively connected to the seat bar and the parking lever and operable to lock or release the vehicle axle, and conditional force delivery mechanism for normally allowing the axle lock to brake the vehicle axle and for causing the axle lock to release the vehicle axle only when the seat bar is in the lowered position with the parking lever shifted into the release position.

Abstract: A power-shifted transmission for industrial vehicles comprises a transmission casing and input and output shafts rotatably mounted on the transmission casing. The input and output shafts are drivingly connectable to each other through a forward shaft assembly, a reverse shaft assembly and an intermediate shaft assembly. The forward shaft assembly is rotatingly driven by the input shaft and operable to deliver the torque of the input shaft to the output shaft at a first or second forward gear ratio. The reverse shaft assembly is rotatingly driven by the forward shaft assembly and operable to deliver the torque of the input shaft to the output shaft at a first or second reverse gear ratio. The intermediate shaft assembly is rotatingly driven by the reverse shaft assembly and operable to deliver the torque of the input shaft to the output shaft at a third forward gear ratio.

Abstract: A pump motor mounting arrangement includes a vehicle frame and a motor bracket fixedly secured to a side of the pump motor, the motor bracket having an upper extension and a lower extension to which a bottom positioning bolt is removably attached. A support ledge is affixed to the vehicle frame for supporting the lower extension of the motor bracket. The support ledge has a slot extending generally in parallel to the vehicle frame and receiving the head of the bottom positioning bolt. The pump motor mounting arrangement further includes a top fixture plate for, when tightened, depressing the upper extension of the motor bracket against the vehicle frame to keep the pump in place and for, when loosened, allowing the pump motor to be slidingly moved on the support ledge into a temporary maintenance position.

Abstract: A self-diagnostic method is provided capable of testing condition of various components for a forklift truck selectively, displaying the result test codes collectively on a display after completing the test, and initiating a quick test mode during a run mode by simply manipulating an accelerator pedal and a direction lever of the forklift truck.

Abstract: A loader includes a vehicle body with a canopy and a seat, a hydraulically operated working implement and a hydraulic control valve unit for controlling flow of working fluid to and from the working implement. Mounted to the canopy of the vehicle body is a seat bar for swinging movement between a lowered position in which an operator is secured to the seat and a raised position in which the operator is released from the seat. A pedal with a dog plate is operatively associated with the control valve unit and tiltable about a horizontal axis between an operative position wherein the control valve unit allows the fluid to be fed to the working implement and a neutral position wherein the control valve unit inhibits delivery of the fluid to the working implement.

Abstract: A machine tool comprises a spindle stock and a worktable provided in front of the spindle stock to support workpieces thereon and capable of up-down movement and swivelling movement about a vertically extending center axis. Also employed in the machine tool is a splash guard arrangement which spatially divides the worktable into a machining region disposed in proximity to the spindle stock and a mounting region positioned distal to the spindle stock. The splash guard arrangement includes a rotary guard rigidly attached to the worktable for movement as a unit with the worktable, a stationary guard provided above the rotary guard and a sealing slider elevationally movably held by the stationary guard. The sealing slider remains in pivotal engagement with the rotary guard so that the slider can be subjected to up-down movement together with the rotary guard, while allowing the swivelling movement of the worktable and the rotary guard independently of the slider.

Abstract: A carbon--carbon composite for friction products comprises an outer friction part and a load bearing structure part supporting the friction part. The friction part contains a mixture of carbon fibers, pitch powder and graphite powder, whereas the structure part is comprised of a pack of alternating layers of the mixture and layers of one member selected from the group consisting of carbon fabrics, carbon-based prepregs and carbon-based, segmented prepregs.

Abstract: A synchronized chaotic system and a communication system using the synchronized chaotic system is disclosed. The synchronized chaotic system comprises a master chaotic part and a slave chaotic part, and a first synchronizing part connected to the master chaotic part and a second synchronizing part connected to the slave chaotic part. The first and second synchronizing parts preform operational functions to synchronize a chaotic signal output of the master chaotic part with a chaotic signal output of the slave chaotic part. Each of the first and second synchronizing parts includes a first scaler, a subtracter, a second scaler, and an adder. Each output of the adder is fed back to the main and slave chaotic parts. The synchronization occurs when the synchronized system consisting of the variable differences of the master and the slave chaotic parts generates infinite period of laminar phase which is connected with on-off intermittency.

Abstract: A pump motor control apparatus is adapted to control a pump motor of a forklift truck by using a driving transistor connected between a battery and the pump motor. The pump motor control apparatus includes a current detection circuit for detecting a current flowing through the pump motor to generate a current detection signal representing the current. A controller is employed to determine the load condition based on the current detection signal to thereby generate a control signal for use in the control of the driving transistor. The control signal is a pulse width modulation signal whose on-duty ratio is controlled depending on the load condition so as to decrease the torque and speed of the pump motor during the unloaded condition but to increase the torque and speed of the pump motor during the loaded condition.

Abstract: A method of producing a wear resistant mechanical component is disclosed which enables the crown value of a wear resistant tip to be controlled at one's desire. A component preform is provided by placing the wear resistant tip on a metal body with a brazing material interposed between them. The wear resistant tip has a smaller coefficient of thermal expansion than that of the metal body. The component preform is heated up to a brazing temperature selected from the temperature range between an austenite transformation starting temperature at which the metal body begins to undergo austenitic transformation and an austenitic transformation ending temperature at which the metal body terminates the austenitic transformation. The heated component preform is cooled down to the normal temperature so that the wear resistant tip is deformed into a crown shape having a crown value corresponding to the brazing temperature.

Abstract: A mast assembly for forklift trucks improves the vehicle operator's front visibility by way of widening the window provided at the center thereof. The mast assembly includes a first hose sheave rotatably attached to the top of an intermediate mast and a second hose sheave rotatably secured to the intermediate mast at a location immediately below the first hose sheave and having a diameter smaller than that of the first hose sheave. First and second fluid hoses wound respectively around the first and second hose sheaves, each of the fluid hoses having a rear end anchored to the outer mast and a front end affixed to the carriage assembly which can slide along an inner mast. The carriage assembly is capable of holding first and second attachment actuators in fluid communication with the first and second fluid hoses.

Abstract: A vehicle levelling device includes a vehicle body with a rear section and a rear axle carried under the rear section of the vehicle body to provide support therefor. A support yoke is hingedly mounted to the vehicle body for pivotal movement about a transverse axis in a vertical plane. The support yoke holds the rear axle in a manner that the rear axle can rotate about a longitudinal axis. A hydraulic cylinder is attached to the vehicle body at a first end and to the support yoke at a second end so that it can be operated to lower or raise the rear section of the vehicle body with respect to the rear axle to thereby bring a tilted forklift into a horizontal position. Operation of the hydraulic cylinder is controlled by an electronic controller which in turn receives a tilt signal from a tilt sensor.

Abstract: A loader includes a seat bar swingable between a lowered, operator protective position and a raised, non-protective position. A pedal is movable between an operative position and a neutral position and has a plate member with a slot opened at it's top end. A pedal side crank is provided adjacent the pedal for rotation between a locking position and an unlocking position. Normally biased into the locking position, the pedal side crank has a lug member and is operatively coupled to the seat bar by virtue of a connecting rod and a seat bar side crank. Movement into the raised position of the seat bar causes the lug member of the pedal side crank to engage with the slot of the plate member of the pedal, thus locking the pedal in the neutral position.