Abstract: An acoustic surface wave device comprises a piezoelectric substrate (1), an input transducer (2), an output transducer (3) and acoustical absorbent layer patterns (5, 6) for absorbing undesired acoustic surface waves and bulk waves (S.sub.4, S.sub.5). Each of the acoustical absorbent layer patterns (5, 6) has zigzag-shaped or triangular shaped edges, i.e., a recess portion (R.sub.1, R.sub.3) and a protruding portion (R.sub.2, R.sub.4). The recess portion has a further recess portion (R.sub.1 ', R.sub.3 ') which is formed diagonally with respect to the propagation path of acoustic surface waves.

Abstract: Electrical connections to thin film coatings, especially useful in a fluid flowmeter, have a conductive coating pressed against a rigid, relatively long, connector bar by conductively coated pads of elastomeric material at a selected controlled pressure, with the electrical connections to the film coating being made through the bar and pads. Utilizing this method, localized high stress areas which cause damage to the thin film are avoided, and low current densities are accomplished by the controlled contact pressure over a large area of the film coating.

Abstract: A device with an electromagnetic clutch includes a tubular member of steel which is secured to, and cantilevered by, a flange member secured to a housing of the device. A pulley having magnetic pole faces is rotatably mounted on the tubular member by one or more bearings. A drive shaft of the device extends out of the housing and through the tubular member, and supports a magnetic armature on the extended end. An electromagnet associating with the pulley is fixedly supported on the flange member to supply magnetic attraction force for attracting the armature plate to the pulley. In the arrangement, since the wall thickness of the tubular member is made thin, the outer diameter of the clutch can be reduced without degrading the transmission of rotational force. And a shaft seal assembly can be mounted on the drive shaft within the tubular member. Furthermore, the inner ring of the bearing is held between the flange member and a retaining ring fitted onto the tubular member, to be prevented from axial movement.

Abstract: A piezoceramic device has two layers of piezoceramic material bonded together, the layers polarized in opposite directions. The device is used to detect, and indicate, a change of voltage between two conductors and specifically is used between the tip and ring lines of a telephone line having more than one extension, to give a line status indication. A visual, yet non-electrical, readout of one polarity is provided when the bending piezoelectric element moves into a window in the housing wall.

Abstract: A linear array for rectilinear and sector scan imaging has identical approximately diamond-shaped transducer elements fabricated by making two pairs of straight line cuts at small angles through a piezoelectric slab. The Y-axis radiation pattern (parallel to element length and perpendicular to the array length) has lower side lobe levels than equal sized rectangular elements. No changes in the imager electronics among channels is required, and the shading function may be modified by changing only the transducer.

Abstract: A rotational speed indication signal generator comprises a magnetic circuit and a plurality of generating coils radially arranged with respect to the rotary shaft of a rotor. Each of the generating coils is wound around a radial projection of a circular disk made of a magnetic material so that the axis of the generating coils is normal to the rotary shaft. The generating coils are electrically connected in series in such a manner that a noise voltage induced across one coil caused by external flux has opposite poloraity to that of a noise voltage induced across another coil positioned opposite with respect to the rotary shaft. The electrical connection of the generating coils has a given circular direction while a lead wire connected to the last coil in the series connection has a circular direction opposite to the direction of the series connection.

Abstract: An AC/DC generator small in size and small in weight is obtained by forming into one unit an ordinary charging generator and an inductor type generator which are juxtaposed in the axial direction. The AC section has no commutator; it can supply power for lamps or heating elements in a vehicle.

Abstract: An apparatus which reduces magnetic cogging between a rotor and stator of an electrical motor or generator. The stator is divided into pairs of angular pie-shaped segments, one member of each pair being shifted angularly with respect to the other member of the pair a distance equal to one-half of one pole pitch. This places the teeth of a shifted stator segment between the alternating magnetic poles of the rotor while the teeth of the unshifted segment are directly opposite the poles. When the rotor is moved, the reluctance torque, or magnetic cogging due to one member of a pair, virtually cancels the reluctance torque of the other member of the pair.

Abstract: A kitchen appliance, having an interchangeable tool attachment, such as a stirrer arm, and an interchangeable container attachment, such as a food chopper. The tool attachment has a base which is secured to the appliance through rotation of a rotatable tension ring assembly, surrounding a power takeoff shaft and a retainer ring, and includes a housing pivotally connected to the base. The container attachment is secured through recesses in its base which engage pins on the retainer ring. A locking bolt is provided on the container attachment which engages the cover thereof, the locking bolt being engageable in a locked position by a slide coupled to a power switch through a blocking rod whenever the power switch is actuated, such that the container attachment cover may not be removed with the appliance in an activated state.

Abstract: A safety device for preventing overspeed of a rotary shaft driven by an electrical motor is arranged to cut a portion of an electrical circuit feeding the motor with electrical power, by making a cutter received in a rotary member jump up or protrude by a centrifugal force acting on the cutter, so that dangerous overspeed is prevented. The cutter is movably received in a radial bore made in the rotary member, and receives a tensile force from a coil spring which is fixedly supported by the rotary member at one end of the spring. An adjusting screw, which is a cylindrical member, is provided for biasing the cutter against the tensile force from the spring. A critical rotational speed, above which the cutter jumps to break the electrical circuit, can be freely adjusted by changing the position of the adjusting screw. The change in position of the adjusting screw results in both the change of an eccentric distance of the cutter and the change of the tensile force of the spring.

Abstract: A liquid-cooled eddy-current coupling device is disclosed, having a field coil and rotatable inductor and rotor members within a housing, with the rotor member having a tubular extension with an exterior circumferential groove disposed to direct liquid coolant away from the field coil.

Abstract: A surface acoustic wave device on a piezoelectric substrate comprises an interdigital transducer having an interdigital sending part in the forward direction and an interdigital reflecting part in the reverse direction. An electrical phase difference of .phi. (radian) is applied between the sending and reflecting parts, while the distance between the sending and reflecting parts providing a geometrical phase difference therebetween is established to be ##EQU1## where n is a positive integer and .lambda..sub.o is the wavelength of surface acoustic wave. A third, common electrode meanders between the sending and reflecting electrodes.

Abstract: There is provided an apparatus such as a dry shaver comprising a housing formed by two opposing housing shells. An electric motor is mounted on at least one support extending from one housing shell. Adjacent the support a resilient hook is formed integrally with, and projects from, such one housing shell in order to secure the motor to the shell, the resilient hook engaging an edge portion of the motor and urging the motor against the support. A projection extends inwardly from the other housing shell to engage the resilient hook and thereby constitute a stop for it and position the hook relative to the motor.

Abstract: An alternator assembly for an automotive vehicle including a rectifier device composed of a plurality of diodes supported on a negative-side cooling fin of semi-circular arc shape, a plurality of diodes supported on a positive-side cooling fin of semi-circular arc shape, and a terminal board supporting a plurality of terminals connected to the diodes. The rectifier device is assembled and held in a unitary structure by a plurality of metal members, and arranged in a space defined by an end frame and a rear cover of the alternator assembly in such a manner that the metal members are in contact at one end thereof with the rear cover and at the other end thereof with the end frame.

Abstract: An AC generator for vehicles has a cooling fan secured to one end face of a rotor core and being operative to produce radial and axial flows of cooling air. The radial air flow passes across a stator coil and outwardly through air outlet openings formed in a peripheral wall portion of a housing. The axial air flow passes through spaces between respective fingers of rotor core and also through air gap between the rotor and stator whereby the rotor and stator coils are reliably cooled by the cooling fan. In an embodiment of the invention, an additional radial-flow fan is provided and mounted on the rotor in face-to-face contacting relationship with the other end face of the rotor core.

Abstract: A magneto-generator for engine ignition has a cup-shaped pole-wheel with a multiplicity of magnet poles (13) within which is a stationary star-shaped armature having generator windings (20) on the outwardly extending pole legs. A pulse generator (24) is built in with its winding around a core (25) having one end affixed to the armature core (17) between two pole legs (18) and its other end terminating in a pole head (27) that cooperates with a projection (28) of the revolving pole-wheel to enable a control pulse to be generated by a flux derived from the same magnets that serve the generator windings.

Abstract: In a support and connection device for a disc-shaped piezoelectric resonator, the support elements are bent at their ends relative to the resonator and comprise electrically conductive spring strips which engage into radially-directed resonator slots. Tongues attached to the bent sections form clips at the support elements which are open towards the top and provide pockets which are suitable for receiving conductive adhesive.

Abstract: A switch assembly for a dynamoelectric machine is provided with a protected switch contact for preventing foreign matter from affecting switch contact operation. Preferably, the assembly includes a support. A plurality of electrical connections are attached to the support. The switch assembly functions as an interface permitting connection of an external source of power to the dynamoelectric machine. The protected contact is a part of the start winding circuit and the protective device preferably includes a cap structure having a closed bottom and an open top. A second electrical contact is mounted to a switch arm through the cap structure and is movable in response to force applied to the switch arm. The open end of the cap structure is closed by a series of elements including a first washer. A soft compressible or pliable washer is positioned inboard of the first washer. A third metallic washer is positioned inboard of the pliable washer.

Abstract: An ultrasonic image device such as may be used in a holography system or scanning system and having a piezoelectric transducer in which the conversion efficiency and phase are substantially constant over a wide frequency range. A piezoelectric sheet 5 .mu.m to 1000 .mu.m thick is used for a piezoelectric element. The piezoelectric sheet is constructed of a macromolecular material including polymers and copolymers of polar monomers. A high frequency signal input device applies to the electrodes coupled to the piezoelectric sheet high frequency signals of different frequencies in a range around a fundamental resonance of the piezoelectric sheet of .+-.10 to .+-.70% of the fundamental resonance frequency.

Abstract: A thin film metallic loop is used to electrically short the gap between metallic portions of a surface acoustic wave device to eliminate substrate surface cracks. The loop is deposited on the substrate at the same time the structures defining the gap are deposited.