Abstract: A hydraulic control system for excavators includes a variable displacement pump for producing a variable volume of pressurized working fluid, a hydraulic swing motor rotatably driven by the working fluid and a flow control valve operable to control flow of the working fluid with respect to the swing motor. The first flow control valve comprises a valve body and a valve spool slidably fitted into the valve body for selective shifting movement between a first operative position, a second operative position and a neutral position.

Abstract: A resiliently yieldable tail stock device for use in a numerically controlled lathe comprises a body slidable along a bed toward and away from a spindle, the slidable body having a bore and a passage hole each formed therethrough in an axial alignment with the spindle. Removably received within the bore of the slidable body is a center socket movable between an extended position and a retracted position and having a tapering blind bore open at its front end. The center socket carries a live center that has a pointed front end engageable with a workpiece and a tapering rear shank fitted into the tapering bore. Fixedly secured to the center socket is an elongate rod carrying a dog at its distal end. A compression spring is used to resiliently bias the center socket toward the extended position. A combination of electric motor and lead screw serves to cause a linear reciprocating movement of the slidable body. The electric motor is deenergized as the dog reaches a rearmost position just above a proximity switch.

Abstract: A thermal refiningless, hot-rolled steel exhibits impact strength in excess of 10kgf.multidot.m/cm.sup.2 and contains, expressed in terms of weight percent, 0.30-0.50% carbon, 0.15-0.60% silicon, 0.80-1.60% manganese, up to 0.02% phosphorus, up to 0.015% sulfur, 0.07-0.20% vanadium, 0.015-0.06% aluminum, 0.005-0.015% nitrogen, up to 0.0015% oxygen, the balance iron and unavoidable impurities. The steel of the above-identified property and composition is produced by casting a steel product of predetermined cross-sectional shape; heating the steel product up to a temperature of 1,100.degree.-1,250.degree. C.; hot-rolling the heated steel product at a final rolling temperature of 850.degree.1,000.degree. C.; normalizing the hot-rolled steel product at a temperature of 880.degree.-950.degree. C.; and cooling the normalized steel product down to 300.degree. C. at a cooling speed of 5.degree.-100.degree. C./min.

Abstract: A canopy mounting device for a skid steer loader adapted for pivotally mounting a canopy on a vehicle body with a gas spring disposed between the canopy and the vehicle body in a preloaded condition, comprises: a bracket fixedly secured to the vehicle body, the bracket having a first through-hole; a hinge block attached to the canopy, the hinge block having an interlocking lug at an upper end thereof, a second through-hole formed adjacent to a lower end thereof and an abutment surface extending downward from the interlocking lug; a pivot pin inserted through the first and second through-holes to enable the canopy to be pivoted with respect to the vehicle body between a first closed position and a second open position; an interlocking ring for holding the canopy against pivotal movement into the first closed position, the interlocking ring engaged with the interlocking lug of the hinge block when the canopy is in the second open position; and a height-adjustable stopper for coming into contact with the abutmen

Abstract: An arm position control device for use in an industrial robot which comprises: a support body; a rotary arm rotatably mounted on the support body for rotation towed one of clockwise and counterclockwise deviation zones from a home position within a permissible angular extent; a home position sensor fixedly attached to the support body to identify home position of the rotary arm; a limit sensor fixedly secured to the support body with a predetermined angular spacing from the home position sensor to detect movement of the rotary arm beyond the permissible angular extent; a sensor actuator rotatable with the rotary arm as a unit for keeping the home position sensor interrupted when the rotary arm lies in the clockwise deviation zone, for making the home position sensor released when the rotary arm lies in the counterclockwise deviation zone and for bringing the limit sensor into a released condition as the rotary arm is out of the permissible angular extent; and an arm actuator operatively coupled to the rotary

Abstract: An electronic component feeder is provided for transferring a succession of electronic components borne by a carrier tape toward a pickup position one by one, the carrier tape having a backing strip and a protective cover strip adhesively secured to the backing strip to hold the electronic components in position.

Abstract: A machining center adapted for use in cutting a workpiece into a desired shape, comprising: a bed having a table for changeably holding a first pallet; a support die disposed in front of the bed to support a second pallet to be changed with the first pallet; a machine housing extending upwardly from the bed to define a cutting compartment enclosing the first pallet, the machine housing having a frontal access opening; a rotary door mounted on the machine housing to openably close the access opening; pivot pins for pivotally supporting the rotary door at central top and bottom edges of the door; a pallet changer disposed beneath the rotary door for exchanging the first and second pallets with each other, the pallet changer including a rotary arm, a vertical cylinder for causing the arm to vertically move from a lower position to an upper position and first and second horizontal cylinders for causing the arm to rotate between a first angular position where the arm remains parallel to the door and a second angul

Abstract: A inching system adapted for releasing a transmission clutch to disconnect engine power delivery in an industrial vehicle comprises a main pump for creating pump pressure; a brake pedal operated by a driver; a master cylinder communicating with the main pump through a pump pressure supply conduit for producing brake pressure in to perform a brake operation as the brake pedal is pressed; a charging pump for discharging clutch actuation fluid to be fed to the transmission clutch; an inching valve including a valve housing having a pilot chamber provided at a first end thereof to receive the pump pressure and a valve spool slidably fitted within the valve housing, the valve spool having a first operative position for feeding the clutch actuation fluid to the transmission clutch to engage the clutch and a second operative position for cutting off the clutch actuation fluid to release the transmission clutch when the pressure within the pilot chamber becomes higher than a predetermined valve; and a pilot conduit f

Abstract: A foldable shock absorbing seat for industrial vehicles comprises a seat member; a back member extending upwardly from a rear end of the seat member; a first folding joint for allowing the back member to be folded relative to the seat member; a frame for supporting the seat member and the back member; a second folding joint provided on the frame for enabling the frame to be folded as the back member is folded toward the seat member; and a unit for absorbing shock inflicted on the seat member and the back member, and shock absorbing unit disposed between the frame and the seat and back members.

Abstract: A load clamping apparatus is provided for use with a forklift truck including a mast having a vertical guide channel, a lift carriage mounted to the mast for elevational movement therealong and a pair of spaced apart forks carried by the lift carriage to support a load to be handled.

Abstract: A flow modulation device is provided for restricting fluid flow exhausted from a first, actuator-sided conduit toward a second, reservoir-sided conduit to an acceptable rate in the event of sudden pressure drop within the second conduit.

Abstract: In a skid-steer loader of front type, the present invention offers a safety apparatus for the operator by way of providing a seat bar securely retainable in its desired position, a pair of supporting blocks and a pair of mounting blocks for retaining the seat bar. The safety device further includes a pair of actuating mechanisms for the parking brake operable in response to the pivotal movement of the seat bar.

Abstract: The present invention is directed to a discrete drive system for a skid steer loader comprising a pair of independent transmission cases interconnected by a plate member at a spaced relationship. The transmission cases enclose chain and sprocket drives for the loader and have the axle housings outwardly extending from the outer side walls thereof. A pair of gear reduction means are mounted on the inner side walls of the transmission cases to provide a drive power to the front and rear stub axles at reduced speeds. The gear reduction means incorporates an improved brake device including a circular drum secured to the reduction gear, a flexible band wound around the drum and an eccentric cam shaft for actuation of the brake device. Coupled to the gear reduction means are a pair of hydrostatic motors having output shaft extending into the outer casings of the reduction means. Each of the output shafts has a tapering shape and terminates at its threaded end to facilitate the mounting of the pinion gear.

Abstract: An apparatus for accurately measuring laser beam intensity profiles so as to permit adjusting the oscillation mode of the laser to achieve good workability of the beam. The beam from a CO.sub.2 laser generator is attenuated and applied to an infrared sensor which produces an electrical analog signal representing the beam intensity. The sensed signal is amplified and applied via an A/D converter and an interface to a computer. The computer controls a scanner which scans successive scanning lines of the laser beam profile across the sensor. The computer also produces a visual image of the laser beam intensity profile from the sensor signal. An operator veiwing such image can make an accurate and convenient measurement of the laser beam intensity profile, thereby providing a basis for quantitative analysis in quality inspection of workpieces subjected to the laser beam.

Abstract: An apparatus for detecting defects in a laser mirror by using a laser beam in order to detect any possible changes in reflectivity over the surface of the mirror. A laser beam is split by a beam splitter into one portion for scanning the mirror to be inspected and which is reflected therefrom to produce a reflection signal, the remaining portion of the beam providing a reference signal. A computer receives both signals and on the basis of comparison thereof determines the condition of the mirror because there will be incorrect reflection of the laser beam from any region of the mirror which is defective.

Abstract: An automatic notching device in a sewing machine comprises a worm engaged with a worm gear fixed to a driving shaft of the sewing machine, a driving cam having a cam portion formed with a plurality of protrusions and a cylindrical boss portion, and an actuating link pivotally moved dependant on the movement of said cam. A cutter-holding member is provided to move upwardly and downwardly by the movement of actuating link transmitted via a linkage member and a swing arm. During the movement of the cutter-holding member, the cutter cooperates with a cutter-guiding member disposed adjacent to a side of needle-guiding member, in order to effect a simultaneous notching operation in sewing a curved portion of garment. The notching device further comprises a push rod having at one end a lever and at the other end a yoke. An actuating shaft is connected at one end to said yoke and has a roller at its other end. Depending upon the position of the lever the roller is moved upwardly or downwardly.