Abstract: This invention relates to an operation-indicating device for fuse cartridges for electrical protection, of the type comprising a plunger formed by a pusher element which is retained against a resilient actuating member by a secondary fuse wire connected in parallel with the wire or wires or fusible elements of the cartridge, characterized in that the base of the plunger cooperates with the conventional portion of the reduced section of the secondary wire, and an intermediate piece is in contact with the wire on either of said portion which is arranged so as to behave in non-conductive manner with respect to low-voltage current which passes through this wire and in conductive manner when the reduced section is fused so that the high-voltage current is transmitted to the two parts of the secondary wire disposed on either side of the portion of reduced section.

Abstract: A relay comprises a yoke, an armature, a movable contact spring having a movable contact, at least one stationary contact mounted thereon, and a core. An air damper is mounted on a free end of the movable spring, or on a free end of the armature, to reduce sound generated by the impulsive force of the movable contact and the impulsive force of the armature.

Abstract: A fail-safe secondary fuse device for assuring the grounding of a conductive gas tube used in modular protection devices for individual subscriber circuit pairs. The device resiliently engages each of the three end and center electrodes normally provided on the tube. In the case of the end electrodes, the device is insulated from direct electrical communication by a fusible sleeve of insulative material which fuses under heat emanating from the gas tube with the occurrence of continued current overload.

Abstract: An electric fuse of the type which has a tubular fuse casing and a solid fuse end terminal telescopically received within the fuse casing is provided with an annular seal which is contained within an annular groove formed in the outer lateral wall of the end terminal. The seal is formed from a settable material which has been injected into the groove through a seal injection opening in the outer end of the end terminal which extends from the axial outer end and into fluid communication with an annular groove provided in the end terminal. A seal material bleed opening is provided in the end terminal which also extends from the axial outer end of the end terminal and into fluid communication with the annular groove. The bleed opening is positioned substantially diametrically opposed to the seal injection opening.

Abstract: A thermal overload relay comprising a change-over spring mechanism and a contact mechanism that is separated from the spring mechanism. The contact mechanism is actuated by the spring mechanism, which is driven by a bimetallic strip when an overcurrent flows through the strip. The spring mechanism has no electrically conducting portion. The change-over point of the spring mechanism varies only a little, thus enhancing the reliability. The spring mechanism is easy to assemble and adjust.

Abstract: A thermostat assembly includes a spring washer interposed between a switch case and a bimetal disc for biasing such disc into firm engagement with the disc housing to enhance heat transfer and dampen bouncing of the disc.

Abstract: A motor protector includes a case having an open end, a terminal plate secured to the case and having a pair of fixed contacts, a disc-shaped bimetal supported in the case and having a pair of movable contacts engaged with and disengaged from the fixed contacts respectively, a temperature-sensitive switch disposed so as to close the open end of the case and sensing the temperature of a sensed object to be turned on when the temperature thereof reaches a predetermined value, and a heater disposed in the vicinity of the bimetal and connected in series to the temperature-sensitive switch.

Abstract: A rain shield for a circuit-interrupting device is provided that includes a housing for attachment to the circuit interrupter adjacent an exhaust outlet of the circuit interrupter. The rain shield prevents the ingress of moisture while providing a path for the exhaust gases of the circuit interrupter. The rain shield is selectively attachable to the circuit interrupter and is reusable. In one arrangement, the rain shield includes a housing which is generally cylindrical and has an inlet opening at a first end for cooperation with the exhaust outlet of the circuit interrupter. At a second opposite end of the housing, an outlet is defined that includes a predetermined pattern of openings. A centrally disposed plate is provided adjacent the outlet and functions as a drip cap such that moisture in the form of precipitation that enters the outlet of the rain shield is prevented from entering the inlet opening adjacent the circuit interrupter.

Abstract: A spring powered switching mechanism in which the energy required to complete switching is stored in a spring (or springs) which are constrained in a "cocked" or stressed condition by a fuse wire. The fuse wire has the characteristic of having a relative flat coefficient of resistivity over a large temperature range. The mechanism is operative to close (or open) electrical circuits permanently upon receipt of the appropriate electrical signal to the "fuse" or "bridge" wire which is caused to break as a result of the receipt of the electrical signal.

Abstract: A spring loaded blown fuse indicator is provided that is adapted to be mounted directly on the side of an electric fuse in parallel with the fuse current path.The indicator provides an indicating pin that extends perpendicular to the longitudinal axis of the fuse. The indicator body comprises two identical molded halves which facilitate assembly and allow the indicator restraining wire to be readily encapsulated in an arc-quenching epoxy adhesive.

Abstract: A combination plug including an outer housing, an inner housing slidably insertable into the outer housing, a fuse assembly retained within the inner housing, and a snap fitted conductor body fitted within the outer housing. The inner housing includes a pair of prongs which are passable through respective slots of the outer housing and a pair of openings for receiving the prongs of an add-on plug. The fuse assembly includes an H-shaped plastic fuse holder, a pair of fuses held in respective grooves of the plastic fuse holder, and four copper covers, each cover covering a respective terminal of the H-shaped fuse holder and connecting both ends of each fuse. The snap fitted conductor body includes a conductor tap casing, two conducting wires, and two conductor taps. The provision of the copper covers is to provide a larger contact surface between the fuses and the conducting taps of the conductor body and the prongs.

Abstract: This invention provides a supersonic expulsion fuse for interrupting fault currents in high voltage alternating current networks. It creates an arc interruption region with a long length of supersonic turbulent flow and little or no subsonic plasma. This increases the arc interrupting capability against both thermal and dielectric arc reignitions. Therefore, the transient recovery voltage the network applies across the interrupted arc after current-zero may be increased in both frequency and peak values, relative to present-art expulsion fuses. It may be applied on power distribution systems as a power fuse in enclosures or overhead where the said system transient recovery voltages exceed the capabilities of conventional distribution cutouts.

Abstract: An electrical circuit breaker comprises a base with two terminals embedded in, and extending through, the base. The external plug-in portions of the terminals are centered on the base. The internal portions of the terminals are off to one side in order to accommodate a PMB bimetal mounted on said internal portions. A cover secured to the base encloses the PMB bimetal.

Abstract: A circuit breaker having a fixed current contact (12,14), a movable current contact (16,18), a mechanism (20,22,54,66,68) for displacing the movable current contact (16,18) between a circuit closing position and a circuit opening position, and a latching member (32,34) disposed to cooperate with the mechanism (20,22,54,66,68) and movable in response to the magnitude of current flowing through the circuit to be controlled in order to cause the mechanism (20,22,54,66,68) to move the movable contact (16,18) in a manner to open the circuit when the magnitude of current flow exceeds a certain value, movement of the latching member (32,34) being controlled by a memory metal element (40,42) which is mechanically connected to the latching member (32,34) and electrically connected in the circuit to be heated by current flowing through the circuit to cause the latching member (32,34) to release the mechanism (20,22,54,66,68) when the current flowing through the circuit exceeds a given value for a selected period of tim

Abstract: In a temperature limiter (1) with a rod-like temperature sensor (6), the outer tube is formed by a continuously tensile-stressed insulating tube (7) extending into a base (2). An inner rod (8), optionally articulated two or more times in the longitudinal direction, is constructed as a continuously pressure-loaded rod, characterized by temperature-dependent length expansion. The temperature limiter (1), e.g., for a glass ceramic unit, may have a circuit breaker (5) closer to the temperature sensor, and a more-remote signal switch (4). In that case, for operating the remote signal switch, a flat bar-like transfer member (9) traverses both switches through openings (54). The transfer member is coupled at the associated end and in adjustable manner with an operating member (30) for the signal switch (4), receiving the adjustment member (34). The parts are constantly held together in clearance-free manner by the tension of a restoring spring (40).

Abstract: A sub-miniature fuse having a fusible conductor which will fuse under an over-current condition within a pressure-tight chamber. A metal surface is positioned near the fusible conductor within the chamber and is formed and positioned relative to the fusible conductor so that during the switching off of the fuse, any arc created between the fused ends jumps over to the metal surface. Thus, at least one secondary arc is created which burns against the metal surface as a shunt line. By melting a part of the metal surface, sufficient heat is absorbed that the secondary arc is quenched.

Abstract: A thermal printer comprising first and second supply means for supplying first and second recording mediums, an image processing portion having a memory means for storing black-and-white image and color image informations, an inked sheet having color portions, a recording means for recording images on the first and second recording mediums, and a control means for controlling movements of the first or second supply means and of the inked sheet, in accordance with conditions whether a black-and-white image or a color image is to be recorded.

Abstract: A thermally controlled electric switching arrangement with a temperature controller, having a snap-action switch actuated by a bimetallic strip and of which the dead center position is displaceable by a manually operable setting device in order to influence the control point, and with a temperature limiter which is constructed as a melting metal fuse which comprises a fusible element, pressure elements engaging therein and at least one switching contact held in the closed position by the pressure element, so long as the limiter has not responded, is structurally simplified, the simplification also being intended to improve the variability of installation of the switching arrangement. This is achieved in that the movable contact of the temperature limiter which is actuated by a thrust pin biases a first contact face of the fixed contact of the temperature limiter, which is opposite a second contact face of the fixed contact which is biased by the movable contact of the temperature controller.

Abstract: A method of adjusting stimulation amplitude in continuous ink jet printers to provide satellite-free printing includes the steps varying the stimulation amplitude between the underdrive and overdrive stimulation conditions, charging the resulting ink jet filaments at their break off points with sawtooth voltage of period equal to the stimulation period, detecting and storing the resultant drop charging events and setting the operating stimulation amplitude based on the inception point inflection in the resulting stimulation amplitude versus detected charge relation.

Abstract: Disclosed is an ink jet printer in which an ink is continuously spouted through a nozzle and divided into ink droplet. The ink droplets are selectively charged by supplied pulse voltages. After the supply of a prescribed charging voltage to a charging electrode is stopped, a voltage lower than the charging voltage is supplied to the electrode. Consequently, the ink droplets destined to land on a recording medium is prevented from making any deflected movement and from ginving rise to secondary dots. During the intitial period of the supply of the charging voltage to the charging electrode, a voltage higher that the normal charging voltage is supplied to preclude the occurrence of ink droplets of an intermediate potential due to a time lag between the time the voltage is supplied to the charging electrode and the time the ink droplets are electrically charged. Any attempt at heightening the operating speed of the printer entails no occurrence of secondary dots.