Abstract: A four-wheel driven vehicle including a front wheel high/low speed changeover device adapted to be set to the high speed side upon detection of at least one condition out of three conditions, i.e. an excessive turning angle of the front wheel over a predetermined angle, a low vehicle speed below a predetermined speed and actuation of either rear wheel brake.

Abstract: A tiller cover assembly covering a rotary tiller unit is provided inside thereof with rake members arranged at a spacing along the width of cultivation for sieving lumps or blocks of soil carried around by the tiller unit. Each of the raker members is made of a resilient rod which has a coiled portion toward its base end and is fixed to an attaching member at the base end above the coiled portion. The coiled portions of the rake members are projected toward an upwardly or downwardly movable rear cover of the cover assembly, permitting the rear cover to contact the coiled portions. A clearance is formed between sieving portions of the rake members extending downward from the coiled portions to their free ends and the rear cover. A protector is provided on the inner side of the coiled portions, by which the lumps or blocks of soil carried around by the tiller unit are prevented from striking the coiled portions.

Abstract: The present invention relates to the technology to make use of the governor housing in the governor device for the air-fuel mixture suction type engine in common to that of a diesel engine. In the governor device of the present invention, the cover plate for closing the square hole formed in the governor housing is provided with the support hole, through which the shaft portion of the intermediate actuating lever is supported pivotably. The governor lever provided within the governor housing is linked to the throttle valve through the intermediate actuating lever. Therefore, in case that the cover plate to support the intermediate actuating lever is attached to the square hole, the governor housing can be utilized for the air-fuel mixture suction type engine. And in case that the cover plate to support the speed setting lever is attached to the square hole, the governor housing can be utilized for the diesel engine.

Abstract: An agricultural tractor with a driver's cabin, in which the cabin is supported by a safety frame which is in turn supported by an axle case.

Abstract: The disposed fruit harvesting robot comprises fruit detecting sensors arranged around an opening of a cylindrical case for taking in fruit. The case also includes at least one additional sensor disposed inside the case.

Abstract: A lubrication system for a vertical shaft engine includes a crank case having an upper and a lower wall, a vertical crank shaft, a vertical balancing shaft, each pair of upper and lower bosses formed in said upper and lower walls for rotatably supporting these shafts an oil pump having a drive shaft housed in a lower boss for supporting said balancing shaft, and adopted to be driven by said balancing shaft, and an oil feeding passage for feeding lubricating oil from said pump to any part desired to be lubricated in said engine.

Abstract: A method of controlling reaping level comprising the steps of averaging the lengths measured by a noncontact distance sensor, comparing the preset target data with the measured and averaged data, computing the difference therebetween and raising or lowering a reaping section in accordance with the amount of the difference. When averaging the measured data, abnormal data which cause erroneous functions may be omitted prior to averaging.

Abstract: A self-propelled agricultural machine having a control section disposed laterally of a transmission case to control a drive transmission mechanism. A cover for a transmission device for transmitting engine output to the drive transmission mechanism is disposed laterally outwardly of the control section, and a fuel tank is disposed upwardly of the control section. Accordingly, the cover and the fuel tank protect the control section from contact by crop, shrubs and the like.

Abstract: There is disclosed a control apparatus for a vehicle comprising a tiltable steering wheel. The control apparatus includes a hand lever tiltable in unison with the steering wheel and substantially on the same axis on which the steering wheel tilts. Operability of the hand lever is unaffected by tilted positions of the steering wheel and hand lever.

Abstract: An improved vertical grinding mill is provided which has a shell, a vertical helically bladed shaft rotatably mounted in the shell, a collector, a drive for the shaft, and a fan or a pump. The shaft is hollow and its lower end is open at the bottom of the shell. This assures a uniform distribution of the material to be treated, the grinding medium and the product particles and thus high production efficiency.

Abstract: A separation preventive pipe joint comprises a socket and a spigot inserted into the socket with an annular packing interposed therebetween. An annular gland connected to the socket has an axial packing presser projection and is internally provided wtih an annular receptacle groove. Arcuate engaging segments are incliningly disposed in a circular arrangement within the receptacle groove and retained there by elastic distancing members. The engaging segments are radially inwardly pressed by pressing bolts to engage in the spigot outer periphery. Each engaging the segment elastically deforms in a manner of a Belleville spring in response toseparating movement of the spigot to assume a posture generally perpendicular to the spigot outer periphery so that the engaging element engages in the spigot outer periphery more firmly.

Abstract: There is disposed a valve control structure for a working vehicle for operating two control valves by means of a control lever rockable crosswise, wherein one of the valves is operable by a rocking movement in a first direction of the control lever and the other valve is operable by a rocking movement in a second direction of the control lever. A connection switching mechanism is provided between the control lever and the valves to switch interlocking relations of the two control valves with respect to the rocking directions of control lever. This switching is readily carried out by operating a single switch lever permits the operator to use the vehicle after selecting the interlocking relations to which he is accustomed.

Abstract: A detecting apparatus utilizing light comprising a light beam emitter for emitting beams of light having a predetermined light path toward a plurality of retroreflectors adapted to reflect light in a direction from which the light strikes thereupon, and a receiver to receive the beams of light reflected by the retroreflectors, the light beam emitter including a light source and a mirror for detecting the beams of light received from the light source toward the retroreflectors, characterized in that the apparatus further comprises a drive to rotate the mirror about an axis normal to an optical axis of the beams of light extending from the light source to the mirror and also normal to directions in which the beams of light proceed from the mirror to the retroreflectors, and that slits are defined at outlets from which the beams of light proceed toward the retroreflectors, the slits having a shape to permit the beams of light to diffuse vertically.

Abstract: A drive apparatus for a work vehicle such as a tractor is disclosed, with an engine, an input shaft coupled to the engine, a change-speed mechanism, a hydraulic clutch, an auxiliary change-speed mechanism and a reduction mechanism housed in a common transmission case. Power from the reduction mechanism is transmitted to the rear wheels through a rear differential and to the front wheels through a drive shaft and a front differential.

Abstract: A hydraulic circuit construction for a tractor having a hydraulic stepless change speed apparatus wherein pressure oil is supplied to the charge oil line regardless of whether the main clutch is engaged or disengaged while the engine is running. Furthermore, where the lift arm cylinder is the single acting type, the pressure oil from the hydraulic pump directly connected to the engine is divided at a flow priority valve, its excess flow being supplied to the hydraulic circuit for driving the lift arm cylinder, into a return oil line from this circuit a control flow of the flow priority valve being joined, whereby at least a constant amount of control flow is supplied to the charge oil line to avoid a complete break of the charge oil supply even if there is no flow of pressure oil in the return oil line at times of pressure oil supply to the single acting lift arm cylinder.

Abstract: A fiber reinforced metal alloy comprising a metal matrix and a fibrous reinforcement which is constituted by refractory fibers having a high tensile strength. The fiber reinforced metal alloy is manufactured by the use of a centrifugal casting method.

Abstract: A splash lubricating system for an engine having a crank case, a crank room formed in said crank case, an oil reserving room formed in lower part of said crank case for lubricating oil, and an oil splasher extending from a big end of the connecting rod downward so as to splash about lubricating oil from said reserving room to said crank room on its way from the front side to the back side along the lower part of its orbit, wherein the improvement involves a transverse partition covering over all of said oil reserving room, disposed in the upper space thereof, having an opening which allows said oil splasher to move therein, and three buffer plates covering front, right and left sides of said opening respectively for controlling oil level under them.

Abstract: A tractor transmission wherein an engine output is transmitted through a clutch mechanism to a primary change speed mechanism, and a clutch housing and a first transmission case are removably connected to each other. The first transmission case includes a space in a forward portion thereof to accommodate a high speed and low speed switching mechanism and a forward and backward switching mechanism, interchangeable with each other, to be attached to a rear wall of the clutch housing.

Abstract: An automatic running work vehicle which is adapted to repeat a running travel reciprocatingly and which has means for teaching the running course of one travel by sampling the running direction detected by an orientation sensor every predetermined running distance detected by a distance sensor during the travel and for steering the work vehicle based on the information of running course taught by the preceding travel when follower sensors fail to detect the boundary of the running course for a predetermined period of time.

Abstract: Apparatus and method for controlling an automatically running vehicle over a predetermined course which has guidelines intermittently placed therein. Vehicle commands used to negotiate the course under manual control are stored in a memory. The vehicle has sensors which detect the presence and location of the guidelines as the vehicle passes by. The vehicle travels the course under control of the stored vehicle commands until guidelines are detected indicating the vehicle is off course. Then, vehicle control is switched so that the vehicle returns on course, over the guidelines. When the guidelines are no longer detected, vehicle control is returned to the memorized vehicle commands in such a fashion as to synchronize the actual vehicle position with the memorized data.