Abstract: A plastic fuel tank having polyethylene layers is disclosed. The polyethylene layer positioned as the outermost layer of the plastic fuel tank is a high-density polyethylene layer admixed with an ultraviolet inhibitor for minimizing transmission of ultraviolet light.

Abstract: A plastic fuel tank is disclosed including polyethylene layers laminated respectively onto an upper surface and a lower surface of an ethylene/vinyl alcohol layer for preventing fuel seepage. The outermost polyethylene layer laminated onto the upper surface is a high-density polyethylene layer colored black so as to minimize transmission of ultraviolet light.

Abstract: A plastic fuel tank is disclosed including polyethylene layers laminated respectively onto an upper surface and a lower surface of an ethylene/vinyl alcohol layer for preventing fuel seepage. The outermost polyethylene layer laminated onto the upper surface is a high-density polyethylene layer colored black so as to minimize transmission of ultraviolet light.

Abstract: A plastic fuel tank having polyethylene layers is disclosed. The polyethylene layer positioned as the outermost layer of the plastic fuel tank is a high-density polyethylene layer admixed with an ultraviolet inhibitor for minimizing transmission of ultraviolet light.

Abstract: In a multi-blade fan for an air-cooled engine, by defining the inlet angle ?1 and the angle ??2 to make the sum thereof less than 80° (preferably defining ?1 as 32° and ??2 as 36°), the multi-blade fan achieves greater air volume than in the case where the sum is made 80° or greater, where ?1 is the angle between the relative velocity direction and the peripheral direction on the inlet side of the blades, ?2 is the angle between the relative velocity direction and the peripheral direction on the outlet side of the blades, and ??2 is the difference obtained by subtracting ?2 from 180°. The number of blades can therefore be reduced to realize lower noise level while still maintaining the same air volume as the prior art multi-blade fan.

Abstract: Raw material nuts may be quenched using an extremely low temperature liquefied gas to produce cracks in the raw material nuts. The cracked raw material nuts may then be crumbled along the cracks to separate the nuts into small nut fragments. After returning the temperature of the nuts to the ambient temperature, additional cracks can be further produced in the nut fragments by quenching the nut fragments. Smaller nut fragments can then be obtained by crumbling along the cracks. Small nut fragments in desired sizes may be obtained by repeating the process of cracking and crumbling as many times as desired. The astringent skin of the nuts may also be peeled off while the small nut fragments are produced.

Abstract: In a multi-blade fan for an air-cooled engine, by defining the inlet angle ?1 and the angle ??2 to make the sum thereof less than 80° (preferably defining ?1 as 32° and ??2 as 36°), the multi-blade fan achieves greater air volume than in the case where the sum is made 80° or greater, where ?1 is the angle between the relative velocity direction and the peripheral direction on the inlet side of the blades, ?2 is the angle between the relative velocity direction and the peripheral direction on the outlet side of the blades, and ??2 is the difference obtained by subtracting ?2 from 180°. The number of blades can therefore be reduced to realize lower noise level while still maintaining the same air volume as the prior art multi-blade fan.

Abstract: In an engine operated machine system including a hollow support rod connected at one end to an engine through a vibration insulator, an auxiliary weight is mounted at the other end of a crankshaft for generating a centrifugal force in the same direction as an inertia force of a piston, when the piston reaches top and bottom dead centers. Thus, it is possible to bring a center of gravity of the engine closer to the position of the vibration insulator, thereby suppressing the application of the vibration from the engine to the support rod to the utmost.

Abstract: Raw material nuts may be quenched using an extremely low temperature liquefied gas to produce cracks in the raw material nuts. The cracked raw material nuts may then be crumbled along the cracks to separate the nuts into small nut fragments. After returning the temperature of the nuts to the ambient temperature, additional cracks can be further produced in the nut fragments by quenching the nut fragments. Smaller nut fragments can then be obtained by crumbling along the cracks. Small nut fragments in desired sizes may be obtained by repeating the process of cracking and crumbling as many times as desired. The astringent skin of the nuts may also be peeled off while the small nut fragments are produced.

Abstract: In an engine operated machine system including a hollow support rod connected at one end to an engine through a vibration insulator, an auxiliary weight is mounted at the other end of a crankshaft for generating a centrifugal force in the same direction as an inertia force of a piston, when the piston reaches top and bottom dead centers. Thus, it is possible to bring a center of gravity of the engine closer to the position of the vibration insulator, thereby suppressing the application of the vibration from the engine to the support rod to the utmost.

Abstract: An anti-oxidation technique for treating raw foods, such as nuts and seeds, so as to make them oxidation-resistant. In the technique of the present invention, foodstuffs such as nuts, seeds, etc., are heated under pressure in a tightly closed vessel, so that the texture of the raw food materials is slightly softened, and so that the moisture activity value is at the same time adjusted to a value in the polymolecular-layer moisture region of approximately 0.3-0.4. As a result, the water molecules are absorbed on the surfaces of the lipid molecules so that a polymolecular layer of water is formed and strong bonds between the water and proteins act synergistically to prevent penetration of oxygen into the interior texture of the foodstuff, such as nuts, thus conspicuously hindering oxidation.

Abstract: A separating/punching device is provided which can simultaneously separate an outer and inner cylindrical portion of a cylindrical piece from each other and remove a bottom from the inner cylindrical portion by punching as a single step. A fixed die assembly includes a die having a setting hole, and a tubular fixed punch for separation having its tip inserted in the setting hole of the die. A movable die assembly movable toward and away from the fixed die assembly includes a tubular movable punch for separation which can fit around the tip of the fixed punch, and a punch mounted coaxially in the movable punch for punching out the bottom of the cylindrical piece.

Abstract: A mulching mower is provided which is capable of cutting grasses finely without leaving uncut grasses and which is capable of discharging the cut grass clippings onto the cut grass path so as to be evenly dispersed. A pair of cutter blades are arranged to the right and to the left of the mulching mower in a cutter housing which opens downwardly. A guitar-shaped or figure 8 shaped enclosure wall hangs down from an under surface of an upper wall of the cutter housing to completely surround the periphery of the right and left cutter blades along tip end rotation loci of the blades at a slight distance therefrom. The enclosure wall is formed by side wall portions ar right and left outsides of the cutter housing and front and rear enclosure wall portions hang down from the under surface. The cutter blades rotate in opposite directions from each other so that tip ends of the cutter blades move from front to rear at right and left outsides, respectively, of the mulching mower.

Abstract: A lawn mower includes a cutter blade rotatably disposed in a cutter housing, for cutting grass, a discharge fan rotatably disposed in the cutter housing upwardly of the cutter blade, for discharging grass clippings cut off by the cutter blade, a power source disposed outside of the cutter housing, and a speed reducer mechanism disposed outside of the cutter housing upwardly of the discharge fan, for transmitting mechanical power from the power source at a reduced speed to the discharge fan to rotate the discharge fan at a speed lower than the speed at which the cutter blade rotates. The cutter blade comprises a flat member and lies substantially horizontally.

Abstract: A dressing device for dressing a grinding stone is disclosed. The grinding stone is used for grinding an edge of a glass pane. The dressing device comprises a container in which dressing members are contained and piled. A grooved holding member mounts thereon the container. The holding member includes a front portion projected forward from a front wall of the container and a rear portion projected rearward from a rear wall of the container. The front and rear walls of the container are respectively formed with front and rear openings whose lower peripheries are bounded by a bottom wall of the groove of the grooved holding member. The front opening is so sized to pass therethrough each of the dressing members. A pushing plate is slidably received in the groove of the rear portion of the holding member. The pushing plate is so sized so as to pass through the rear opening.