Abstract: A flat motor. The flat motor comprises a substrate, a cantilevered, resilient lever arm mounted, by a passive end, on the substrate; and a shape-memory transducer acting on the lever arm wherein movement of the transducer deflects the lever arm.

Abstract: A lighting system, in particular for bicycles, which operates in accordance with the principle of a wind generator. The lighting system (1) is mounted at the front of the bicycle above the front wheel. A system comprising a dynamo (2), propeller (3), electrical circuit (6), battery (4) and lighting devices (5) which are adapted to each other permits the illumination of a tail light even when stationary. A voltage monitor and an overload protector are part of the circuit (6).

Abstract: A rotary actuator (1) with magnetically acting restoring element (18), particularly for controlling a throttle cross-section, is intended to be simplified in its structure and the torque variation of the restoring element (18) is to be improved. For this purpose, the restoring element (18) is constructed of ferromagnetic but not permanently magnetic, material and arranged in the area of the permanent magnet segments (10) of the motor actuator (2). Due to the asymmetrical construction of the restoring element (18) with three short arms (22 to 24) and one extended arm (25), the maximum torque generated by the element (18) is reduced and the restoring angle, from which the element (18) returns back into its desired locking position, is increased. The rotary actuator (1) is suitable, in particular, as rotary idling actuator for internal combustion engines.

Abstract: There is presented a device for dampening vibratory motion. The device coises a ferromagnetic housing, a non-magnetic, electrically conductive wall upstanding in the housing, and a plunger assembly. The plunger assembly includes a magnetic body movable in the housing adjacent the wall, and connector structure extending from the body and in communication with a vibratory energy source.

Abstract: A battery charger employing the gassing point of a lead-acid battery to determine the end of charge time and voltage. A charging level sensor takes two voltage samples of a predetermined time period to determine the change in voltage rate. If the change in voltage rate exceeds a predetermined amount the batteries are considered to be gassing. The batteries are further charged for a predetermined amount of time after the gassing phase has been entered. The invention provides a load management control function to provide a safe DC charge voltage when a hall effect sensor senses a DC load. The charger is cut off if a house load is used while the battery is being charged. The charging circuit achieves different end of charge voltages depending on a user selected battery type. The battery charger is a constant voltage temperature compensated current limited charger.

Abstract: A portable, reversibly driven power tool (11) comprises a reversible motor and an assembly (17) for electrically switching the direction of motor rotation and/or for shifting the commutator brushes (99, 101) for optimizing motor performance in both the forward and reverse directions. Assembly (17) includes a reversing switch (56) and an actuator (19) which is movable between forward and reverse positions for reversing the connections of the reversing switch (56) to reverse the direction of motor rotation. Actuator (19) includes (a) a sleeve (81) connected to the reversing (56) switch and surrounding the motor stator (43) to guide movement of the actuator (19) between the forward and reverse positions and (b) a manual control tab (85) ergonomically located in the motor housing (23) slightly forward of a manual power switch (21) in the tool handle (35).

Abstract: A motor-compressor unit is provided which comprises a vibration motor (1) having an armature (3) which can perform a rotationally vibrating movement about a drive shaft (4), and a compressor (10) having at least one piston (12) which can be reciprocated in a cylinder (11) by an arm (9) of the armature (3). The couping between the piston (12) and the arm (9) comprises a sleeve (15), which is slidable in a bore (16) in the piston and which is connected to the arm (9) by a ball joint (21). The oscillating movement of the arm (9) produces a helical reciprocating movement of the piston (12). This leads to an improved lubrication.

Abstract: A high torque AC stepping motor is provided. The motor includes a stator with six radially spaced coils. Spaced radially extending arms on an armature core are positioned adjacent the coils. The armature is mounted by a torsional shaft assembly including two concentric torque tubes. the torsional action of the tubes serves to return the armature to a home position after each current pulse. A one way sprag clutch is driven by the output shaft connected to the armature to turn an output gear or the like. A timer controls the AC power source to provide the precise rotary output. A system for precisely feeding webs of material for processing utilizing the stepping motor is also disclosed.

Abstract: A motor-compressor unit comprising a vibration motor (1) having a single-part magnetizable stator (2) in the form of a W, arcuate air gaps (9, 10) being formed between the peripheral surface (6) of the central limb 3 of the W and each of the outer limbs (4, 5) of the W, and an armature (11) which is reciprocatingly pivotable about a motor shaft (12). The armature comprises at least one permanent magnet pole element (13), at least one coil (16, 17) arranged on the stator, an alternating current through the coil producing an oscillating movement of the armature (11), a compressor (21) having a linearly reciprocating piston (24) which is coupled to the armature (11), the coupling (25) being arranged diametrically opposite the pole element (13) relative to the motor shaft (12).

Abstract: A solenoid has a coil with an outer core and an inner core. The cores provide the magnetic circuit around the coil. The inner core includes a rotor which has radially extending armatures. The armatures are positioned in gaps between radially extending poles of the outer core so as to form air gaps between the poles and the armatures. When the coil is energized, the armatures are attracted to the poles and cause the rotor to rotate, thereby closing the air gaps. The shaft is coupled to the rotor through a drive mechanism so as to rotate with the rotor. The shaft is made of a material with a relatively high magnetic permeability, as are the inner and outer cores, so that the shaft is magnetically coupled to the inner core rotor. When the rotor stops rotating, the shaft also stops. A return spring returns the rotor to its deenergized position when the coil is deenergized, recreating the air gaps. The drive mechanism allows the shaft to remain stationary while the rotors return to the deenergized position.

Abstract: A motor-compressor comprising a vibration motor (1) having a rotationally vibrating drive shaft (4) and a compressor (2) having at least one piston (10) which is linearly reciprocated by the motor shaft (4) is suspended in the housing (14) by means of springs (15) so that the points of attachment (17) of the springs are coplanar with and as close as possible to the axis (16) of the rotation, to which the motor- compressor is subjected in operation. This counteracts the imbalance forces to a maximum extent and minimizes the dynamic forces on the housing.

Abstract: A vibrator for providing revolving vibration to a body to be vibrated such as a dispersion table of a vibration feeder or a sieve stack of a screening machine. In this vibrator, it is possible not only to control the amplitude of vibration but also to obtain a uniform vibration amplitude everywhere in the vibrating body inclusive of its center. A unique feature of this vibrator involves a plurality of armatures fixed to and around a vibrating member and actuated by associated electromagnets energized with multiphase a.c. power.

Abstract: A rotary solenoid includes a rotating shaft on which a rotor is fixedly mounted, a pair of stators arranged on both sides of the rotor and a driving coil disposed around the stators. The opposed arrangement of the pair of stators allows to rotate the rotating shaft at high speed. When the rotary solenoid is combined with a one-way clutch, there is provided an apparatus for converting an oscillating rotary motion into an incremental and intermittent rotary motion, which may be advantageously applied to a system for advancing an ink ribbon in a printer and the like.

Abstract: An electronic motor includes a shaft mounted for rotation about a rotational axis. A plurality of radial lever arms are mounted with respect to the shaft. Each lever arm has an inner end connected to the shaft by a one-way clutch. The clutches allow the shaft to rotate in only a first circumferential direction with respect to the lever arms. An electrically conductive element is attached to an outer end of each lever arm. A drive coil is positioned adjacent to each electrically conductive element. A drive circuit periodically and sequentially energizes each drive coil with current pulses. Each drive coil is oriented to produce a first pulsed magnetic field in a direction generally tangential to the circumferential direction when energized. The first magnetic field induces circulating currents within the electrically conductive element. The circulating currents in turn produce a second magnetic field about the electrically conductive element.

Abstract: A machine for generating electrical power having a mechanical oscillator arranged to drive the armature of a linear generator. The oscillator, in turn, is driven by an independent prime mover.

Abstract: A stepper drive system including a pair of linear belt flights trained between interior surfaces of a fixed frame and a reciprocable armature carriage with the belts alternately clamped to the carriage so as to successively advance the belt flights in opposite directions. The armature carriage is powered by a linear motor defined by a pair of permanent magnets fixed to the carriage and at least one, preferably two, electrically conductive coils fixed in the frame such that when energized the armature carriage will be driven in one of two directions along a given path between fixed stops established by the frame. To clamp the belt flights to the carriage, an energizeable belt gripping device is mounted on the carriage and includes a reciprocable armature fitted with belt deforming nipples, aperture engaging pins, or a planar surface for friction engagement. Alternately, the belt flights may be also coated with a magnetically permeable material so as to be electromagnetically drawn against the belt clamp.

Abstract: A motion producing apparatus is disclosed for moving an element, such as a lens element, along a given path. Included in the apparatus is a linear actuator having a pair of output members. The actuator is energizable for reciprocally moving in synchronism each of said output members in mutually opposite directions. Also provided is a mechanism for alternately coupling the output members to the movable lens element so as to progressively move the lens in a given direction along the given path.

Abstract: An electromagnetic motor with a piston coil supported on a shaft between the field coils, the shaft being slideably supported in the frame so that the piston coil is moveable between the field coils. The piston coil is in electrical connection with the power source and has a constant magnetic polarity. The field coils and piston coil all are wound in the same direction. The shaft supporting the piston coil is pivotally connected to a crankshaft. The magnetic distributor switches are activated by rotation of the rotor in response to movement of the piston to maintain the field coils at opposite polarities and to reverse the polarities of the field coils at the end of each stroke of the piston, the piston having a two stroke cycle. The field coils also include secondary coils to recover energy from the primary coils by induction. A pulser is provided electrically intermediate the power source and the field coils to supply pulsed current to the field coils.

Abstract: An improved thermally sensitive printer for recording characters on a thermally sensitive medium is provided. An exothermic printing head includes a substrate and a plurality of selectively energized resistance elements supported on the substrate, the resistance elements being energized during a printing operation to print characters on a thermally sensitive medium in contact therewith. A rotary platen is provided for bringing the thermally sensitive medium into printing contact with the resistance printing elements to thereby effect printing on the thermally sensitive medium during a printing operation. The rotary platen is also adapted to incrementally advance the thermally sensitive printing medium after each printing operation.

Abstract: Electromagnetic driving mechanism for oscillating displacement pumps (10) is described which comprises a linear motor (21, 22) and a control circuit (51, 52, 53, 54). The control circuit controls the stroke movement of the linear motor (21, 22) in response to the deviation of the actual value of a stroke parameter (stroke distance, stroke speed, stroke acceleration, and pressure of the medium being pumped) from the reference value of this stroke parameter. A preferred embodiment is assembled in such a manner that the pump (10) proper may be easily exchanged and constructed as a discardable unit. Such a pump unit (10) is particularly desirable in connection with blood pumps.

Abstract: An electromagnetic driving device for driving shutter blades wherein a field coil used as stator encircles a permanent magnet rotor and extends across the rotational axis thereof. The rotor is arranged to undergo reciprocating rotation through less than one half turn in driving the shutter blades to open and close the shutter. Interference between the field coil and a coaxially arranged output shaft is avoided by the provision of a U-shaped intermediate member extending about the field coil and connecting the output shaft and the rotor.

Abstract: A driving wheel is mounted on the output shaft of a step motor, and a driven wheel engaging with gear wheels on which pointers are set is driven by said driving wheel. The driving wheel and the drive wheel have respective peripheral portions effective to couple the driving wheel with the driven wheel to rotate the driven wheel as the driving wheel rotates of an angular interval of rotation, and for thereafter disengaging the driving member from the driven member.In order to fix the position of a pointer after the driving wheel has finished rotating the driven wheel, the reversal preventing mechanism acts on the said driven wheel or the driving wheel. The driving wheel is driven by a stepping motor having a rotor which intermittently rotates in one direction through a predetermined angular interval to a rest position. The driven wheel is in turn intermittently rotated by the driving wheel to intermittently change the position of the pointer.

Abstract: The within invention, which is directed to effective use of electric energy is concerned with an improved electric motor which, as a substitute for the conventional operative arrangement of rotor and field coils, instead has the rotor urged through movement centrally of, rather than merely past, the field coils, thus obtaining maximum prime mover drive for any electrically powered motor.

Abstract: A rotary motion transformer particularly adapted to provide continuous rotary motion to a driven member in response to an intermittently rotated driving member is provided. The driven member and the driving member are oppositely poled magnetic permeable members disposed proximate to each other to provide a flux field therebetween. The driven rotary member is disposed in a viscous damping reservoir, the viscous damping reservoir effecting smooth and continuous rotation of the driven member.

Abstract: The invention relates to a stepping motor having at least one electromagnet disposed in a casing, a shaft which is mounted for rotation in the casing and on which is rotationally fixed a rotor which in turn is rotationally fastened to an armature mounted on the shaft for longitudinal sliding and cooperating with the electromagnet, and further having a first ball race concentric to the shaft and fastened to the casing and a second ball race cooperating therewith and mounted for rotation in the casing, balls being disposed between the races and the tracks of the latter being so shaped that an axial force on the rotatable ball race result in a rotary movement of the latter, and further having on the armature a flange which engages behind the rotatable ball race and which carries spur toothing having inclined flanks and cooperating with corresponding spur toothing on the rotatable ball race, and having restoring springs imparting to the rotatable ball race an initial stress oppositely to the direction of rotation

Abstract: An electromagneto-mechanical actuator comprising a brushless D.C. torque motor capable of producing a torque proportional to the current fed to coil windings which are arranged as a stator, a permanent magnet being the rotor, these windings being severally arranged opposite the pole end faces of the magnet and being reversely wound so that the magnetomotive forces generated by these windings cancel out each other and thereby eliminate magnetic hysteresis. The pivotal movement of the rotor is converted to translational or rectilinear movement of an output drive element through a substantially frictionless band drive having no backlash. The actuator is preferably arranged in a closed servo loop so that the proportionality of its response can be utilized.