Abstract: A machine tool transmission for use in changing the torque and speed of a spindle rotatingly driven by an electric motor comprises a transmission casing, input and output shafts mounted on the transmission casing in a spaced-apart, parallel relationship for rotation at different speeds from each other, a movable gear axially displaceably fitted to the input shaft for sliding movement between first and second shift positions, first and second stationary gears fixedly secured to the output shaft for rotation in unison therewith, and a gear shifting device for causing the movable gear to be shifted either into the first shift position so that the movable gear can be meshed with the first stationary gear or the second shift position so that the movable gear can be in meshing engagement with the second stationary gear.

Abstract: A splash guard device is utilized in a machine tool to prevent chips and coolant from flying to the outside of a cutting compartment, while permitting smooth pallet changing operation. The splash guard device includes a splash guard door capable of up/down movement and swivellable about a vertical swivel axis in the course of pallet changing operation and an elevationally movable top sealing member having a lowered position in which it remains in contact with the top edge of the splash guard door and a raised position in which it is spaced apart from the top edge of the splash guard door. Responsive to the upward movement of the splash guard door, a linkage mechanism is adapted to cause the top sealing member to move from the lowered position into the raised position. A pair of fixed side splash guard walls extend in a spaced-apart parallel relationship with respect to the corresponding side edge of the splash guard door.

Abstract: A motor direction control device id used for electromotive vehicles which has an electric motor adapted to cause the vehicles to move forwards and backwards. The motor direction control device includes a direction control level shiftable from a neutral position into forward or reverse position. Operatively connected to the direction lever is an elongated pliable strip which is slidable along a predefined moving way by the shifting operation of the direction control lever and carries a permanent magnet. First and second magnetolectric sensors are arranged in a spaced-apart relationship with each other along the moving way of the elongated strip, each of the magnetoelectric sensors capable of generating, when left deactivated, a position signal of first logic level and activatable by the permanent magnet to produce a position signal of second logic level as the direction control lever is shifted into the forward or reverse position.

Abstract: A lathe carriage unit displaceably mounted on a bed for carrying and moving a tool post in a z-axis or x-axis direction comprises a saddle body having a guide slot extending along the length thereof and first and second bearing housings spaced apart from each other. A cross slider is slidably fitted to the guide slot of the saddle body for movement between an extended position and a retracted position. The cross slider can be caused to move by a drive mechanism into the extended or retracted position along the guide slot of the saddle body. The drive mechanism includes a ball screw rotatably supported at its opposite ends on the first and second bearing housings of the saddle body, a ball nut threadedly engaged with the ball screw and fixedly attached to the cross slider and a servo motor operatively connected to the ball screw for causing forward or reverse rotation of the ball screw.

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 synchronizing part. The synchronizing part preforms operational functions to synchronize a chaotic signal output of the master chaotic part with a chaotic signal output of the slave chaotic part. The synchronizing part for preforming the operational functions includes a subtractor, scaler, and an adder. The output of the adder is is feedbacked to the slave chaotic part. 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. Also, the synchronized chaotic system is applied to a communication system for encryption.

Abstract: A vertical machining center is usable in combination with a horizontal machining center in a flexible manufacturing system with no incompatibility of their pallets. This should be attributable to the provision of a vertical pallet designed to clamp a horizontal pallet thereon. The vertical pallet includes, inter alia, a pallet base with a cylinder recess, a pallet saddle provided above the pallet base and removably holding the horizontal pallet therealong, the pallet saddle movable between an up position wherein the horizontal pallet remains unclamped and a down position wherein the horizontal pallet is clamped against the pallet base, and an actuator for causing the pallet saddle to move between the up position and the down position.

Abstract: A fuel tank mount for forklift trucks is adapted to hold a fuel tank over the top of a counterweight in a manner that the tank may be easily lifted up and lowered down. The fuel tank mount includes a swing arm replaceably carrying the fuel tank and mounted to the counterweight for swinging movement about a tilted pivot axis between a home position wherein the fuel tank is held over and laterally across the counterweight, a neutral position wherein the fuel tank remains at its highest elevation and a tank changing position wherein the fuel tank is oriented substantially vertically. The pivot axis remains tilted both forwards at a first tilt angle, e.g., 26 degrees, and outboards at a second tilt angle, e.g., 25 degrees, with respect to a vertical axis. A latch is provided to keep the swing arm in the home position against unwanted swinging movement into the neutral and the tank changing positions.

Abstract: The inventive steering system is of the type having an engine, a fluid reservoir, a steering valve unit, an actuator control valve unit, a main fluid pump driven by the engine for pumping the fluid in the reservoir to feed pressure fluid to the steering valve unit and the actuator control valve unit and a priority valve for enabling the pressure fluid to be first supplied to the steering valve unit. Characteristically, the steering system includes an electric motor, a battery selectively connected to the electric motor for supplying electric current to the electric motor, an auxiliary fluid pump rotatingly driven by the electric motor to produce emergency steering fluid to be fed to the steering valve unit and a power supply controller for disconnecting the electric motor from the battery while the main pump produces the pressure fluid and for connecting the electric motor to the battery when no pressure fluid is discharged from the main pump.

Abstract: A reach type forklift truck is provided with a vehicle body and a reach leg extending forwards from the vehicle body. The reach leg has a guide rail fixedly attached thereto and provided with a vertical wall, a top flange and a bottom flange cooperating together to define a guide groove. A mast assembly with a base is supported on the reach leg and movable along the guide rail toward and away from the vehicle body. Front and rear support rollers are rotatably attached to the base of the mast assembly in a spaced apart relationship with each other and received in the guide groove of the guide rail. A front vertical clearance compensator is mounted to the mast base adjacent the front support roller for making contact with the underneath surface of the top flange of the guide rail, while a rear vertical clearance compensator is similarly provided adjacent the rear support roller for making contact with the top surface of the bottom flange of the guide rail.

Abstract: A fuel tank mount for forklift trucks is adapted to hold a fuel tank over the top of a counterweight in a manner that the tank may be easily lifted up and lowered down. The fuel tank mount includes a swing arm replaceably carrying the fuel tank and mounted to the counterweight for swinging movement about a tilted pivot axis between a home position wherein the fuel tank is held over and laterally across the counterweight, a neutral position wherein the fuel tank remains at its highest elevation and a tank changing position wherein the fuel tank is oriented substantially vertically. The pivot axis remains tilted both forwards at a first tilt angle, e.g., 26 degrees, and outboards at a second tilt angle, e.g., 25 degrees, with respect to a vertical axis. A latch is provided to keep the swing arm in the home position against unwanted swinging movement into the neutral and the tank changing positions.

Abstract: A tool pot is carried by a rotatable pot carrier of a tool magazine to hold a cutting tool with a tail end portion. Swingable between a rest position and an operative position, the tool pot includes a body having an axial tapering bore, an axial end bore for reception of the tail end portion of the cutting tool and a plurality of radial holes each open into the axial end bore at their inner ends. A gripper is provided in the radial holes of the body for releasably gripping the tail end portion of the cutting tool during the time the cutting tool remains held in the tool pot. Built in the body is a tool lock that cooperates with the gripper to lock the cutting tool against removal during the time the tool pot is at the rest position and is caused to swing.

Abstract: A power supply device for an electromotive railcar is adapted to receive external current from an overhead electric line via a pantograph and to feed driving current of lower voltage than the external current to electric loads in the railcar through first and second current output lines. The power supply device is provided with a static inverter couplable to the overhead electric line through first and second input lines and capable of producing the driving current. A battery is connected to the static inverter in parallel with the loads for selectively charging the driving current and discharging the charged electric current to the loads. An anti-discharge switch is provided on the first current output line for selectively connecting and disconnecting the loads to and from the battery.

Abstract: A parking brake is incorporated in a power shift transmission having an input assembly, an idle assembly and an output assembly housed within a transmission housing, the input assembly provided with an input shaft, an input gear fixedly secured to the input shaft for rotation therewith in unison and an output gear selectively couplable to the input gear. The parking brake includes a brake drum extending from the output gear toward the input gear in a coaxial relationship with the input shaft and having a cylindrical outer circumference. A brake band is wrapped around the outer circumference of the brake drum and has a stationary end secured to the transmission housing and a movable end displaceable with respect to the stationary end. A band actuator is operatively associated with the movable end of the brake band for selectively tightening the brake band into frictional contact with the brake drum and loosening the brake band out of contact with the brake drum.

Abstract: A fluid pressure control system for hydraulic excavators includes a load sensing valve in communication with first and second pressure compensator valves via a load sensing line and responsive to a load sensing pressure developed in the load sensing line for regulating the discharge volume of a working fluid and a swing torque regulator lying midway of the load sensing line between the load sensing valve and the first pressure compensator valve to selectively allow and inhibit a fluid communication between the first pressure compensator valve and the load sensing valve depending on the pressure of a pilot fluid.

Abstract: A boom locking device for a skid steer loader includes a prop arm hingedly attached to a boom for swinging movement between a rest position generally in parallel to the boom and a proping position in a bearing engagement with the distal end of a boom cylinder housing to maintain the boom in a raised position against retraction of a boom cylinder piston rod. A release lever is pivotally attached to the free end of the prop arm, the release lever adapted for pivotal movement between an idle position in which the release lever is folded back onto the prop arm, an unfolded position in which the tip end of the release lever rides on the cylinder housing and an arm lifting position in which the release lever bears against the piston rod at the tip end thereof to lift up the prop arm out of engagement with the distal end of the cylinder housing.

Abstract: A numerically controlled lathe includes a spindle, a hydraulic rotary cylinder driven by a pressurized working fluid for causing the spindle to rotate, a fluid pump for discharging the working fluid to be delivered to the hydraulic rotary cylinder, a reservoir for storage of the working fluid, first and second delivery conduits each having first and second ends, the first ends of the delivery conduits selectively connected to the fluid pump and the reservoir, and a fluid coupler for coupling the second ends of the delivery conduits with the hydraulic rotary cylinder.

Abstract: A fuel tank mount for a forklift truck is adapted to mount the fuel tank on a counterweight in a manner that the fuel tank can be removed from an in-use position to an out-of-use position assuring an obstacle-free opening of a hood.

Abstract: A hydraulic control system is provided for use in a forklift truck having an engine, a steering cylinder, a lift cylinder, a tilt cylinder, a steering pump rotatably driven by the engine for producing a steering fluid under pressure to actuate the steering cylinder and a main pump for generating a working fluid under pressure to actuate the lift and tilt cylinders.