Abstract: A hydraulic circuit for controlling the deck swiveling speed of a working vehicle comprises a hydraulic actuator for driving the swivel deck, a flow control valve for controlling a rate of oil flow to the hydraulic actuator, and a direction control valve for switching an operating direction of the hydraulic actuator. The flow control and direction control valves are operatively connected to a swivel control lever. The greater amount of swivel control lever is operated toward a right or left swivel position, to the greater extent the flow control valve is shifted in a flow increasing direction. The direction control valve is operable to switch oil lines in response to an operation of the swivel control lever.

Abstract: A working vehicle comprising an engine mounted on a vehicle frame, a control box mounted on the vehicle frame, and a radiator erected on the vehicle frame between the engine and the control box structure. A dust-proof space is defined by the control box, the radiator and a hinged hood covering the engine. Elastic sealing elements are arranged between opposite lateral sides of the control box and the radiator, and between an upper end of the radiator and the hood. The hood in a closed position presses upon the upper elastic elements to provide an additional support for the radiator and to seal the dust-proof space.

Abstract: This invention relates to an apparatus for pulverizing quick lime into a slurry form. It has a vertical shell and a rotary shaft mounted in the shell. An agitating layer and a pulverizing layer are formed in the shell at its upper and lower portions, respectively. The material fed from top of the shell is agitated and melted into smaller particles in the agitating layer and then pulverized into fine particles in the pulverizing layer. The fine particles are discharged from a top or middle of the shell. A discharge pipe is provided so as to extend upwardly from the discharge port at the middle of the shell. An agitator may be provided in the discharge pipe. The material to be pulverized is prevented from going from the inlet directly to the outlet without passing through the pulverizing layer.

Abstract: A power transmission comprising a drive shaft and a driven shaft connected to each other to be relatively rotatable within a predetermined range. The connection between the two shafts includes a cam member axially slidable on the driven shaft. The driven shaft carries a brake device interlocked with the cam member. When an accelerating force is transmitted from ground wheels to the driven shaft, the cam member slides axially of the driven shaft. This sliding movement causes the brake device to brake the driven shaft.

Abstract: In a four-wheel drive work vehicle selectively drivable in a standard four-wheel drive mode, an accelerated four-wheel drive mode and in a two-wheel drive mode, the invention provides an improved drive-mode switching operability through a linearly operable link mechanism for operatively connecting one operational system for directly operating a shift fork member with another operational system for operating the same via a cam member connected to a steering wheel.

Abstract: A cooling system for an engine mounted in a front portion of a vehicle having a radiator disposed between the engine and a driver's seat, a fan mounted in proximity to the radiator for directing cooling air from the driver's seat to the engine through the radiator, and a cooling air flow passage for interconnecting the fan and ambient air. The cooling air flow passage is provided with an air inlet located away from the driver's seat and defined in the front portion of the vehicle at a forward position than a region of the radiator, extends from the air inlet and is defined by a partition plate and an engine hood.

Abstract: A muffler system for a working vehicle, particularly a lawn mower, comprising a main muffler body connected to an exhaust manifold of the engine, and a curved muffler cover covering the main muffler body from below. An exhaust pipe extends from the main muffler body laterally outwardly of the vehicle body, and defines an exhaust outlet for discharging exhaust gas in a direction away from a front wheel and the ground. Cooling air is blown by a cooling fan from the engine into the muffler cover. The muffler cover defines air exhaust openings for directing the cooling air forwardly of the vehicle body.

Abstract: A propelling drive control apparatus for a working vehicle comprising hydraulically operable friction clutches, a first clutch control valve for selecting between the friction clutches, and a second clutch control valve connected in series to the first clutch control valve. The second clutch control valve is manually switchable to a declutching position for disengaging the friction clutches, a first clutch engaging position for engaging one of the friction clutches, and a second clutch engaging position intermediate between the declutching position the first clutch engaging position. In this second clutch engaging position one of the friction clutches is operable under a lower hydraulic pressure than in the first clutch engaging position.

Abstract: A lawn mower comprising a blade housing supported above the ground by wheels, and a blower case removably connected to one lateral side of the blade housing for blowing grass clippings toward a grass catcher disposed rearwardly of a vehicle body. The blade housing carries wheel support frames secured thereto and extending in a fore and aft direction of the vehicle body. A forward coupling and a rear coupling are secured to one of the wheel support frames for connecting the blower case to the blade housing.

Abstract: A cab structure for a working vehicle comprising a driver's seat, and a steering wheel attached to a free end of a curved steering column. The steering column extends forwardly from a front fender located laterally of the driver's seat and then inwardly toward longitudinal centerline of the vehicle body. The steering wheel is pivotable, for positional adjustment, about an axis of the inwardly extending portion of the steering column. The steering column further carries a steering valve at the free end thereof, which is connected to a steering cylinder and a hydraulic pump through hydraulic rubber pipes extending through the steering column.

Abstract: A vehicle comprising a wet type main clutch mounted in an oil bath within a clutch housing. A flywheel housing is removably attached to a forward end of the clutch housing, with a partition wall in between for preventing oil flow from the clutch housing to the flywheel housing. A clutch input shaft extends through the partition wall, with a forward end splined to a flywheel. A clutch output shaft coaxial with the clutch input shaft has a rear end thereof connected through a spline connection to a change speed shaft extending forwardly through a rear wall of the clutch housing. A geometric engaging device having an aligning function is provided between the clutch output shaft and change speed shaft.

Abstract: A magnetic recording medium having a low noise level and comprising a magnetic film made of a Co-Ni-Cr-P alloy. The Co-Ni-Cr-P alloy has a composition represented by the formula(Co.sub.100-a Ni.sub.a).sub.100-b-c Cr.sub.b P.sub.cwherein a, b and c each represent atomic percent, and 3.ltoreq.a.ltoreq.40, 2.ltoreq.b.ltoreq.10 and 2.ltoreq.c.ltoreq.7.

Abstract: A vehicle change-speed control construction for selectively engaging and disengaging a hydraulic clutch of a propelling transmission system according to a change-speed operation. Through maximum simplification and rationalization, the construction has a hydraulic control system comprised of minimized number of components consisting essentially of one pilot pressure controlled selector valve and a plurality of check valves operable in response to a change-speed operation. The improved construction is extremely simple and economical, yet achieves higher operational efficiency without transmission delay.

Abstract: A speed control structure for a working vehicle comprises a hydraulic clutch, a main change speed device and an auxiliary change speed device mounted in a transmission case. A hydraulic control system includes hydraulic actuators for operating the change speed devices, a speed control valve for controlling the actuators, a pilot operated switch valve operatively connected to the actuators for disengaging the clutch at start of a change speed operation by the actuators, and engaging the clutch upon completion of the change speed operation, and a pilot control valve for controlling a pilot pressure for the switch valve in response to the operation of the actuators. The transmission case defines a lateral opening closed by a lid. The lid carries the actuators mounted on an inside face thereof, the switch valve and the speed control valve mounted on an outside face thereof, and the pilot control valve mounted in an interior thereof.

Abstract: A cabin construction of a wheel loader having a vehicle body with a driver's section at a rear position, a backhoe detachably attached to a rear end of the vehicle body and a cabin for covering the driver's section. The improvement includes a detachable rear end cabin door construction which permits an easy and economical exchange of the rear door as necessary for the varying uses of the vehicle. A first door is used when the vehicle body is attached with the backhoe whereas a second door is used when the vehicle body is used without the backhoe. The feature has eliminated the necessity of costly and troublesome replacement of the entire cabin construction and is advantageous also for forming a compact the rear end of the vehicle.

Abstract: A device for attaching a working machine to a vehicle in which a heavy weight working machine can be detachably and fixedly attached to the vehicle and a three point link type working machine can also be attached through a three points linking mechanism when the heavy working machine is not attached to the vehicle. The device includes an attachment frame at a rear portion of the vehicle body, and a working machine connecting portion for attaching the heavy weight working machine. Further, a three point link connecting portion for connecting the three point linking mechanism is provided on the attachment frame.

Abstract: A roller for use in lithography which comprises a surface layer of finely and uniformly mixed ultra-hard material and lipophilic material. The ultra-hard material is preferably tungsten carbide-cobalt and the lipophilic material is preferably aluminum bronze casting, the aluminum bronze casting being mixed with the tungsten carbide-cobalt in the ratio of 25-40% by weight.

Abstract: A movable case for making a steerable wheel steerable is slidably held in an axle case, a tie rod for a steering operation is made telescopically movable, and the movable case and the tie rod are arranged to be locked at an extended or retracted position. At the time of effecting tread adjustment, a steering wheel is rotated to its extreme end, and the vehicle is made to run with the movable case made slidable, which allows the movable case to slide outward through the axle case, permitting tread adjustment to be carried out automatically.