Abstract: An object is to provide a mold molding method which can provide a high general-purpose property and can reduce a usage quantity of molding sand. In a method for molding a mold (sand mold) by self-hardening molding sand using a caking additive, the mold is molded by disposing hollow spheres each formed to have no clearance therein among molding sand mixed with the caking additive. Preferably, the hollow sphere may be formed by working two metal plates to semispherical shapes and then connecting the semispherical-shaped metal plates to each other by welding their respective whole peripheries. A specific gravity of the hollow sphere may be 0.5 to 2.0 times a specific gravity of the molding sand.

Abstract: A wheel stop is disclosed which is engaged by a wheel of a vehicle in an attempt to be parked in a parking lot, to limit movement of the vehicle. The wheel stop includes a middle extending portion, first and second leg portions, all of which are integrally formed with a metal pipe. The wheel stop further includes first and second anchor plates affixed to the first and second leg portions, respectively, the anchor plates being anchored to the parking lot; an electric cable disposed within the metal pipe; and an electric outlet disposed on an outer surface of the metal pipe, and connected with the electric cable, to thereby allow, when the vehicle parked in the parking lot is an electric car, a power supply cable extending from the electric car to be plugged into the electric outlet.

Abstract: A wheel stop is disclosed which is engaged by a wheel of a vehicle in an attempt to be parked in a parking lot, to limit movement of the vehicle. The wheel stop includes a middle extending portion, first and second leg portions, all of which are integrally formed with a metal pipe. The wheel stop further includes first and second anchor plates affixed to the first and second leg portions, respectively, the anchor plates being anchored to the parking lot; an electric cable disposed within the metal pipe; and an electric outlet disposed on an outer surface of the metal pipe, and connected with the electric cable, to thereby allow, when the vehicle parked in the parking lot is an electric car, a power supply cable extending from the electric car to be plugged into the electric outlet.

Abstract: A micro-etching composition and a printed circuit board fabricated by using the micro-etching composition are provided. The micro-etching composition, comprising a main ingredient consisting of sulfuric acid and hydrogen peroxide and an assisting ingredient consisting of phenyltetrazole and a chloride ion source, can continuously treat the surface of copper and copper alloys to produce fine microscopic pits for improved adhesion to resins without producing a brown or black deposit. The printed circuit board exhibits excellent adhesion between inner layer circuit patterns and insulation resin layers, and is free from haloing.

Abstract: An alpha wave generation apparatus has a voltage controller including a first resistor connected in parallel to an adapter jack and a battery, a converter for supplying power to a microcomputer, a first coil and a diode connected in series between the first resistor and an input terminal of the converter, a second resistor for maintaining an input voltage to the microcomputer constant in level, and a capacitor being charged with an input voltage to the converter or discharging it. The alpha wave generation apparatus generates alpha waves of 4 Hz, 8 Hz, and 10 Hz which, for example, may be used to activate cerebral cells.

Abstract: An etchant for copper or copper alloys comprising 5-50 wt % of an alkanolamine, a copper ion source in the amount of 0.2-10 wt % as copper, a halide ion source in the amount of 0.005-10 wt % as halogen, 0.1-30 wt % of an aliphatic carboxylic acid, and the balance water, wherein the molar ratio of the alkanolamine to one mol of the aliphatic carboxylic acid is two or more. The etchant is free from problems such as instability of the liquid composition and unpleasant odor, has a high etching rate, exhibits only very slight corrosion even if a small amount of residue is left on the surface and is capable of producing a roughened surface when used for microetching.

Abstract: Disclosed is a head base shift mechanism in an auto-reverse cassette tape recorder comprising a motor (2); a chassis (1) with a pair of capstans (41), (41′) rotatable in forward and reverse directions; a head base (15) slidably mounted on the chassis and carrying at least a head (16) substantially at a center of the head base; a pair of pinch rollers (17), (17′) for forward play and reverse play arranged in a substantially symmetric design at opposite sides of the head; spring means (23) for biasing the head base toward a stand-by position remote from a tape running plane (T) defined by and between the capstans; a pair of engagement members (272), (272′) engageable with the head base at a point offset from a center line (X) of the chassis; and rotation transmission means (10) for moving one of the engagement members, selected depending upon the direction of rotation of the motor, while in engagement with the head base at the offset point, thereby moving the head base from the stand-by positi

Abstract: A micro-etching composition and a printed circuit board fabricated by using the micro-etching composition are provided. The micro-etching composition, comprising a main ingredient consisting of sulfuric acid and hydrogen peroxide and an assisting ingredient consisting of phenyltetrazole and a chloride ion source, can continuously treat the surface of copper and copper alloys to produce fine microscopic pits for improved adhesion to resins without producing a brown or black deposit. The printed circuit board exhibits excellent adhesion between inner layer circuit patterns and insulation resin layers, and is free from haloing.

Abstract: A rotational load applying mechanism for a tape recorder having a rotation transmission gear for rotating a reel base in engagement with a gear of the reel base, causing a rotary shaft of the rotation transmission gear to move with operational force acquired by a rotational load of the rotation transmission gear, comprises a rotary arm member made of plastic and rotatable together with the rotary shaft of the rotation transmission gear; and an elastic holder, formed on the arm member, for holding, with a pressure, an outer surface of a boss to be a bearing for the rotary shaft of the rotation transmission gear, thereby applying the rotational load to the rotation transmission gear.

Abstract: A mechanism for retaining one tape deck (12), of a double cassette tape player (14), into a temporal inoperative position, which comprises a trigger arm (40) rotatable about a first pivot (41) on a chassis (15) of the tape deck; a first spring (42) for biasing the trigger arm to rotate in a predetermined direction; a pause lever (50) slideable on the chassis of the tape deck; a second spring (54) for urging the pause lever to move in a predetermined direction; and actuating structure or a push lever (38) that is made operative in response to rotation of the motor to urge the trigger arm to rotate in an opposite direction against the first spring. The pause lever is allowed to be slid in the predetermined direction by the second spring when the trigger arm is caused by the push lever to rotate in the opposite direction.

Abstract: An auto reverse mechanism in a tape recorder system having a single magnetic head for forward playback (recording) and a single magnetic head for reverse playback (recording), both mounted on a head base, comprises a select lever for selecting between forward and reverse modes, a main body plate for gear attachment, provided with a retaining groove for allowing the select lever to be manipulated in the direction of the selected mode, and a forked guide hole so formed as to permit the head base to move forward from the position of the select lever in the selected forward or reverse mode.

Abstract: A tape apparatus autostop mechanism including a head base for setting a driving apparatus in an operational mode; a lock plate that locks the head base at an operational position in response to movement of the head base; a sensor, attached coaxially to a fast forward gear always rotatable in synchronism with a reel base, following the fast forward gear under contact friction with the fast forward gear, the sensor being urged in a rotational direction of the fast forward gear by the contact friction with the fast forward gear; a swingable reset arm urged in one direction by torque of the sensor while the fast forward gear is rotating in right or left directions; a forward gear having an inner and an outer cam, for transmitting force to the reel base; a swingable reset arm arranged to contact the inner and outer cams and rotatably supported; and a reset spring that presses a kick arm, attached to the reset arm, against the inner and outer cams, whereby when the torque of the sensor disappears as the reel base s

Abstract: In an autostop mechanism in a tape recorder equipped with an urging member, a sliding member and a shut-off cam gear, the urging member is located on a bottom surface of a chassis and is formed by a wire spring member. The wire spring member has a proximal end portion shaped like a polygon slightly smaller than a diameter of a shaft of a take-up reel so as to provide urging force when fitted over the shaft of the take-up reel, a distal end extending toward the sliding member, and a midway portion bent at a predetermined angle to form a bent portion abutting against the sliding member in such a way that the urging force of the wire spring member and an action of the distal end of the wire spring member press the sliding member toward a center of the shut-off cam gear cam gear by regardless of the rotational direction of the take-up reel.

Abstract: An autoreverse mechanism for a tape recorder having two fly-wheels and two pinch rollers for winding a tape in forward and reverse directions comprises a head mount plate designed in such a way that when the head mount plate moves toward a reproducing/recording position from a stop position and is locked there, the head mount plate moves while being inclined upper rightward or upper leftward, and is locked, and the two pinch rollers are separately pressed against the respective fly-wheels by using that inclination, thereby winding the tape.

Abstract: A lock mechanism for the clutch of a reel base of a tape recorder, which comprises a fast forward gear to be simultaneously engageable with or disengageable from a pair of upper and lower reel gears of the reel base equipped with a clutch function in accordance with the action of a head mount plate movable together with the reel base in such a manner that the fast forward gear is disengaged from the two reel gears of the reel base according to the forward movement of the head mount plate in a recording/reproducing mode, thus enabling the clutch function of the reel base, and the fast forward gear is simultaneously engaged with the two reel gears of the reel base according to the backward movement of the head mount plate in a fast forward mode or rewinding mode, thus locking the clutch function to disable the clutch.

Abstract: A microetching composition for copper or copper alloys comprising, (a) an oxidizing agent which can oxidize the copper or copper alloy, (b) a polymer compound which contains polyamine chains or a cationic group or both in the amount of 0.000001 to 1.0% by weight, and (c) water. The composition can produce surfaces of copper or copper alloy exhibiting excellent adhesion to resins such as prepregs and resists, and superior solderability. The composition can be adaptable to the manufacture of printed wiring boards with highly integrated fine line patterns.