Abstract: In an SCR circuit controlled universal motor, means is provided for smooth speed control at all speed settings especially low settings which comprises a series wound stator field as part of the motor and at least one closed conductor loop of wire encircling the stator magnetic flux path.

Abstract: An energy limiting circuit for the operating stroke of a motor-driven screwdriver energized by alternating current is activated in response to a pulse of current amplitude, which may be the starting current of the motor or the first of a series of current amplitude pulses characteristic of screw tightening impacts produced by an impact-type screwdriver. The energy limiting circuit in a simple case is a timing circuit. For operation with strict reference to the impacting energy, the energy limiting circuit is a pulse counter. Adjustment of the timing or of the pulse counting is provided for setting the tool to the conditions of a particular repetitive task.

Abstract: A push-button, actuated electric switch is formed with a pair of flat, C-shaped fixed contacts which define an annulus, discontinuous at diametric points, the outer margins of which are clamped firmly between conformations in an upper and lower section of the switch housing. The fixed contacts are bridged to accomplish switching action by the circular perimeter of a moveable contact which is moved toward and away from the inner periphery of the annulus formed by the C-shaped contacts. A tab extending from an edge of each of those fixed contacts extends within a passageway formed in the housing where the tab is bonded to the end of an electrical conductor. The tab and conductor are free to bend and vibrate within the passageway without affecting the position of the portions of the fixed contactor that define the discontinuous annulus whereat mounting and bridging contact are accomplished.

Abstract: The illustrated switch comprises a casing, a push-button movable in the casing along a predetermined axis, fixed contact means disposed in the casing opposite the push-button and generally along such axis, an insulating carriage disc disposed in the casing and along the axis at an intermediate point between the push-button and the fixed contact means, the disc being movable toward and away from the fixed contact means, movable contact means mounted on the disc and movable therewith into and out of engagement with the fixed contact means for establishing and breaking an electrical circuit, a first compression spring disposed in the casing between the casing and the disc for biasing the disc and the movable contact means away from the fixed contact means, and a second compression spring disposed between the push-button and the disc for overcoming the strength of the first compression spring and moving the disc to bring the movable contact means into engagement with the fixed contact means when the push-button i

Abstract: A switch mechanism is disclosed which is readily adaptable to a multiple pole switch mechanism wherein a removable card is supported in a housing. First and second contacts make up a switch pair and are mounted in the housing for mutual cooperation with the first contact having a mounting portion, a movable contact portion and a movable actuable portion. The removable card provides a selective actuation means to actuate the first and second contacts between open and closed circuit conditions. The card has abutment means to engage the movable actuable portion of the contact blade or blades. Also, the card has alternative areas which do not actuate respective ones of the contacts and this may be provided by apertures in the card so that no material of the card is present to engage the contact blade actuable portion. Accordingly, either open or closed circuit conditions may be achieved.

Abstract: A dynamolectric machine stator has a primary winding for single phase alternating current input and a secondary winding for polyphase alternating current to be supplied from output terminals. The secondary winding is connected such that at least two frequencies are provided at the terminals. The rotor has two windings thereon for excitation, one being excitable for one frequency output and the other rotor winding being excitable for another frequency output at the secondary terminals. Another secondary winding may be provided on the stator to obtain a desired output terminal voltage at one of the selected frequencies.

Abstract: Isolation amplifier circuitry for driving inductive as well as resistive ds in an interchangeable circuit design. The device comprises a differential amplifier having both A.C. and D.C. feedback paths when used in both modes of operation with a capability of programmable gain.

Abstract: A grooved contact roller is movable in a housing between two switching poions determined by an elastic positioning element which defines an intermediate position in which the contact roller is in a state of unstable equilibrium. The positioning element is engaged in the groove of the roller and the latter is disposed flat against the bottom of the housing. A slidable cover for the housing constitutes an actuating member for the switch and has a journal which extends toward the bottom of the housing and is engaged with clearance in a central aperture of the roller.

Abstract: A control for activating an electrical load, such as a lighting system, in a motor vehicle having an ignition system. A first voltage, inversely proportional to the frequency of the motor vehicle ignition pulses, is applied to the anode of a programmable unijunction transistor (PUT), and a fixed reference voltage is applied to the gate of the PUT. At low engine speeds, the PUT tends to conduct periodically, deactivating a relay which is operable to energize the motor vehicle headlights. At higher engine speeds, with a greater frequency of ignition pulses, the programmable unijunction transistor fires less frequently, or not at all, allowing the energization of the headlight relay and hence, the application of power to the headlights. Circuitry is also provided to energize the motor vehicle headlights, taillights and instrument lights in response to the activation of the motor vehicle windshield wiper motor and also in response to ambient darkness.

Abstract: An improved contact element is disclosed useful particularly as a contact element bridging at least two stationary contacts. A layer of metal having high electrical conductivity is disposed on selected locations of an electrically conductive disc in alignment with the stationary contacts. Such discs having selectively disposed metal layers are useful for example in low voltage, low current applications wherein contact resistance is preferably kept to a minimum, as in hand held calculators. To form such discs with selectively plated portions, a strip of electrically conductive material, such as a stainless steel is fed from a coil to a first station in which the discs are partially punched from and guide holes are formed in the strip. The strip is then fed intermittently through a series of stations which include degreasing, cleaning, activating, striking, actuating, plating, rinsing and drying and then is recoiled.

Abstract: This disclosure pertains to apparatus mounted to the frame of a vehicle, sensitive to impacts exceeding a predetermined level. The impact device disables a main control relay which feeds all of the electrical circuitry of the vehicle. Turning the ignition switch to the "off" position also de-energizes the main control relay in the same fashion as the impact device further insuring that all electrical circuits in the vehicle are fully disabled.

Abstract: A drive by means of an electric motor for trackless vehicles, in which the rotational speed adjustment takes place by changing the field energization of the electric motor, and with a separating clutch connected behind the motor as well as a change-speed transmission having at least two speeds in the foward driving direction; an energizing current controller for the field winding is provided whose energizing current-desired value is predetermined by another current controller to which are fed, on the one hand, the actual value of the armature current and, on the other, a desired value which is determined by the drive and/or brake pedal when the separating clutch is not actuated, and which is automatically determined by a synchronizing controller or is set to zero during the actuation of the separating clutch.

Abstract: Providing the contact spacer of a high voltage outdoor switch with a reduced number of inboard contacts to reduce the friction experienced in opening and closing the switch without reducing the switch rating.

Abstract: A switching element having reed contacts in a hermetically closed envelope with contact surfaces consisting of a gold alloy having a carbon content of between 0.5 and 1.5 % by weight and a cobalt content of between 1 and 6 % by weight.

Abstract: A metal-enclosed switchgear characterized by a metal enclosure having a rear wall, opposite side walls, a bottom wall, and a front opening with a door therefor. A circuit breaker is removably located in the enclosure and comprises a plurality of arc chutes and an electrically insulating barrier wall on each side of and spaced from each arc chute. In addition, the metal enclosed switchgear comprises stabilizing means for increasing their natural frequency and preventing relative motion between adjacent components of the enclosure and the switchgear in response to ambient vibratory forces which means comprises first spacers of electrically insulating material in the spaces between each arc chute and each adjacent barrier wall, second spacers of electrically insulating material mounted on each opposite side wall and in the space between the side wall and the adjacent barrier wall.

Abstract: An electrical contact adapted to be mounted to a supporting member. The contact has a body with a peripheral portion, and a plurality of means is provided adjacent the peripheral portion for mounting the body in displacement preventing engagement with the supporting member.A method of mounting an electrical contact to a supporting member therefor and an assembly of an electrical contact and a supporting member are also disclosed.

Abstract: A cathodic protection, anticorrosive circuit comprises a diode connection of a transistor or a Schotkky diode interconnected between a buried structure to be protected and a galvanic anode or the like so that even when the difference in potential between them is relatively low, an effective forward or anticorrosion current may flow while positively preventing the reverse current which causes the corrosion of the buried structure.

Abstract: There is provided a vehicle engine-driven alternator wherein an internal combustion engine is coarsely adjusted to a preset speed by an engine governor, the turning driving force of the engine is transmitted to an alternator through a magnetic slip coupling, and the excitation current to the magnetic slip coupling is controlled by an excitation control circuit which compares the number of revolutions of the alternator with a preset value to generate an output depending on the result of the comparison, thereby providing a source of alternating current having an extremely accurate preset frequency.

Abstract: A locking mechanism of the cylinder type for a business machine wherein four different keys can be accommodated in a single lock to perform various functions or modes of operation. The mechanism includes ring members and locking pins operably associated with the cylinder and with the lock body either to permit or to restrict rotational movement thereof with respect to the ring members. Rotation of a key in the cylinder to a predetermined limit sets up a switching arrangement to provide a signal for each mode of operation desired to be accomplished.

Abstract: A friction-drive electricity generating method and equipment utilizing the driving wheel of motor cars, where, in order to make it possible to generate electricity efficiently for a long period by using the engine power of motor cars, a base plate with a jack attached is fixed to one of driving wheels of the motor car in such a manner that it may be held between them and then a dymamo is installed, removably and tilting freely, on the said base plate so that the driving wheel may be lifted up with the said jack and so that electricity may be generated by pressing the dynamo shaft against the driving wheel while it is being revolved by the motor car engine.