Abstract: In a portable power tool, two switches are provided in the handle for respectively effecting rotation of the electric motor in opposite directions. Each switch has a center contact movable between a rest contact and a working contact, the armature of the motor being connected between the two center contacts. Preferably, a common rocker actuates the two switches individually or jointly. In both the rest position of the two switches and in the case when both switches are jointly actuated, intentionally or unintentionally, the armature is short-circuited and braking occurs. Two platelets of electrically conductive synthetic material may advantageously be used as end stops for the switches so that the speed in either direction of rotation is controlled by the pressure of the operator's finger on the selected switch.

Abstract: A document reproduction system is disclosed which employs an imaging array assembly positioned to transmit reflected images from a document in an object plane onto an imaging plane. The imaging assembly includes a 1X lens array and at least one reduction/enlargement lens array. The overall dimensions of the total imaging area of the reproduction system are reduced from conventional fixed lens or fixed document system by providing means for moving the document, imaging assembly and imaging plane in certain prescribed relationships. These means include a pulley/cable/clutch arrangement which enables changes in velocity relationships which are required for a unity magnification mode of operation as well as those for a reduction or enlargement modes of operation.

Abstract: A voltage regulating system for a generator that supplies the battery and electrical loads on a motor vehicle. The system includes a load response control for detecting whenever a substantial electrical load is applied to the generator tending to cause a drop in generator output voltage and when such a condition is detected field current is controlled to gradually increase field current from some value. The load response control includes means for storing an electrical signal that corresponds to generator field current and for utilizing this stored value to set generator field current at a value corresponding to a field current that occurred just prior to the detected drop in voltage and then increasing field current slowly from this value.

Abstract: In a high power density transformer composed of a core and a coil assembly unit (or two such units), with the coil assembly unit including a primary winding, a secondary winding, a coil carrier supporting the windings, an insulating system, and a metal shield between the primary and secondary windings which is in electrically and thermally conductive connection with a metal grounding structure so that the metal grounding structure constitutes a support for the coil assembly, the metal shield serves as the coil carrier which is disposed directly on the metal grounding structure.

Abstract: A cable box for electrical non-metallic sheathed cable includes apertures near the corners of the box for cable to pass into the box. Screw activated clamps operable from outside of the box wedge the cables against the walls of the box. Offset detents in the walls of the box and the clamps facilitate securing the cable to the box. The box can be part of a mounting assembly for a recessed light fixture.

Abstract: A time display apparatus for producing an analog-type display using liquid crystal display elements, electrochomic display elements, or the like is described. The display of this apparatus is divided into two parts: a main display portion for indicating the hour and for indicating the number of minutes past the hour in units of 2.5 minutes, and an auxiliary display portion for indicating the number of minutes in units of 1 minute. The main display portion requires 48 display elements, and the auxiliary display portion requires 4 elements, compared to 120 elements required in conventional time displays. Through this reduction in the number of elements, a small-sized, low-priced display apparatus can be achieved.

Abstract: A toroidal transformer is provided with an inner winding electrostatic shield formed by bringing together two conductive annular cups having a generally U-shaped radial cross section. The widths and radii of the sidewalls of these cups are dimensioned such that one of the sidewalls of the first cup forms a conductive interference fit with the corresponding sidewall of the second cup, while the other sidewall of the first cup is separated from the corresponding sidewall of the second cup by a gap, which prevents the shield from becoming a shorted turn. The shield formed by these two cups is placed around a wound core and a second winding is wound over the shield to form a transformer.

Abstract: According to the method, a strip of nonconductive, fibrous material having a capillary effect with respect to water is fixed in close contact with each conductor of the transmission line. The capillary effect of the fibrous material ensures the formation of thin filaments of water on the surface of the conductor when the same is wet. These filaments of water promote the generation of a corona effect in the form of permanent discharges resulting in a luminescent phenomena and inhibit the occurrence of pulsatory discharges. A conductor for aerial, high voltage, electric power transmission line which allows the above method to be carried out, is also disclosed.

Abstract: A super-conductive wire includes a plurality of super-conductive filaments embedded within a metal matrix. A heat shield layer is circumferentially disposed about the matrix so as to prevent the ingress of diffusion of heat into the matrix from the exterior of the wire, and a plurality of longitudinally extending grooves are defined within the surface portion of the wire to such a radial depth as to penetrate the heat shield layer and therefore permit the matrix of the wire to be in direct thermal contact with a coolant disposed about the exterior of the wire so as to permit heat within the matrix to be discharged therefrom to the exteriorly disposed coolant.

Abstract: A variable magnification optical apparatus for projecting an image at a first plane onto a second plane includes an optical system for forming an image of the first plane on the second plane, a first mirror disposed between the image-forming optical system and the first plane and a second mirror disposed between the image-forming optical system and the second plane. When the magnification is changed, the first mirror is rotated by a determined angle of .theta. and the second mirror is moved in a determined direction while rotating also by the same angle .theta.. The image-forming optical system is moved in the direction along its optical axis and is rotated by an angle two times larger than the rotation angle .theta. of the first mirror at the same time.

Abstract: A propulsion system for use in automotive vehicles wherein the flywheel is connectable with the crankshaft of the internal combustion engine by a first clutch and with the input shaft of the change-speed transmission by a second clutch. When the engine would be idling (such as during stoppage of the vehicle at an intersection) or running unnecessarily for another reason (such as during coasting of the vehicle), the two clutches are disengaged and the flywheel rotates by inertia to restart the engine, when necessary, in response to engagement of the first clutch. If the RPM of the flywheel reaches a preselected lower threshold value, a starter-generator unit automatically accelerates the flywheel so that its RPM rises above the threshold value and is thus sufficient to ensure that the engine is restarted on engagement of the first clutch.

Abstract: A cable core, comprising conductors with insulation and carrying a conductive shield layer is protected and shielded by a corrugated metal tube cooperating either with individual, electrically conductive sealing rings, or a conductive helical sealing ribbon with foam filling any gaps. The construction ensures adequate space for thermal expansion of the insulation without undue tensioning of the tube. A method of making the assembly is described and examples for the ribbon and the foam are given.

Abstract: A start-up failsafe system for an engine control system monitors a command signal and the corresponding feedback signal for a fuel injection rate control servo device when the starter motor switch is closed. If the feedback signal and the command signal differ by more than a predetermined amount, the failsafe system acts to prevent operation of the starter motor.

Abstract: A high frequency coil including an inductance device formed by fitting a pair of electrode caps at both ends of a ferrite magnetic core wound by a winding on a peripheral surface of the core; a heat resistant electric insulating coated layer formed on the peripheral surface of the inductance device and a heat resistant electric insulating resilient tube fitted onto the peripheral surface of the coated inductance device.

Abstract: Disclosed is a conduit sealing connector that may be made from metal or a heat stable polymeric material that is adapted to secure at least two conduits together that also may be made from a metallic or heat stable polymeric material. The connector is provided with a sleeve having a chamber therewithin containing an expandable material which upon heating the connector after is is secured to the conduits is able to expand and engulf any electrical conductors and/or cables extending through the connector between the conduits and fill the chamber sufficiently to provide a barrier against the flow of vapor through the conduits.

Abstract: In an electrophotographic copying apparatus in which the photosensitive drum and associated image forming, developing and cleaning devices are all supported in a subframe movable into and out of a main frame which carries the copy plate and associated optical system, the main power source and the primary paper feeding cassette, paper feeding device in the form of register rollers timed with the operation of the drum, are mounted on the subframe and are adapted to receive paper from the cassette when the subframe is positioned within the main frame and the drum and other operating devices are connected to the main power source.

Abstract: Method and device of utilizing, through heat exchanger or heat pump provided in addition to a normal cooling system, heat due to energy loss in a coil device, such as a transformer or a choke coil having a liquid-cooled interior, which includes throttling the normal cooling system so as to set a difference between the temperature of the interior liquid coolant, at a location under a casing cover of the coil device, and a maximum permissible temperature for a normal useful life of insulation for the coil winding so that the temperature of the inner coolant is lower when the coil device is under full load than when it is under partial load.

Abstract: A shielded cable is provided having good electrical properties and which may be easily terminated. The cable includes an insulated conductor which is encased within a thermoplastic tape, a supported tape, and a metallic shield. The tapes are bonded together during a heating step so that any gaps or voids are eliminated by thermoplastic flow. They may also be peeled as a unit from the insulation during a terminating operation.

Abstract: An apparatus combination for improving the starting mode of a starter for an internal combustion engine is disclosed. The combination comprises a supporting means effective to support the starting motor armature, both for rotary movement about an axis within the field winding and for axial movement in response to the axially directed magnetic forces of the winding. Friction means are employed to sequentially engage each of two conical surfaces carried by the member to be driven by the starter motor, such sequential engagement being in response to the axial movement of the armature. Means are also disclosed to assist the frictional engagement between the conical surfaces of the driven member by use of a resilient ring which allows full metal-to-metal contact between the friction means and driven member, but also provides extended interengagement with the friction means by distortion of the ring along a tangent to the friction means.

Abstract: A microwave device is housed in a plastic injected molded body which has been plated with an electrical conductor to provide shielding. Holes through the walls of the housing are plated and cooperatively function with electrical conductors as coaxial input and output lines.