Abstract: A quick closure box is disclosed, in which the lid is fixed to the base by means of a small pitch screw engaged in an extension having a large pitch thread for engagement in a hole comprising thread portions.

Abstract: A power switching circuit (T115, T5) including at least one bipolar transistor stage (T5) and a control circuit for that stage, the control circuit including first bias means for applying forward bias to that stage during first time intervals (t3), and second bias means for applying reverse bias to that stage during second time intervals (t2, t4), the reverse bias being intended to prevent charge accumulating in the transistor while it is subjected to a reverse voltage.

Abstract: An electromechanical switching apparatus is provided, particularly a protection apparatus, whose contacts are controllable by means of a local of remote controlled electromagnet. The electromagnet is of the monostable type and an engagement mechanism is associated with a mobile assembly connected to the mobile armature. A two position switch accessible from outside the case enables and, respectively, disables the operation of the engagement mechanism. An auxiliary closure piece is provided for manual closure of the contacts.

Abstract: An electromagnet is provided comprising a fixed yoke, a movable armature including a core concentric with an energization coil, and magnetizable plates separated from the yoke by a variable longitudinal air-gap, a return means providing the rest position of the armature, and a compensation device comprising a thin U shaped stirrup piece whose two legs cooperate with the ends of the plate, portions of this stirrup cooperate with inclined ramps of an adjustable rotary cam, placed concentrically with the core of the armature.

Abstract: A protection module is provided for a contact-maker electromagnet. The resistive and capacitive elements of an RC circuit for protecting a contact-maker against parasites are disposed in an insulating module having two projecting receptacles connected together by a third flat receptacle which has passing therethrough connection conductors, two of which are extended by pins adapted for cooperating resiliently with free portions of the terminals of the coil.

Abstract: The invention provides a safety device for switching appliances formed by the assembly of at least two removable modular elements, namely a switching module and an indirect switching control module which is able to pass from a tripped condition to a set condition by means of a setting member, tripping following a tripping order applied to a tripping member. The control module is fixed to the switching module by means of a screw whose head is only accessible in the set condition of the control module.

Abstract: The method concerns preparing a contact material constituted by silver and tin oxide.According to the invention the method comprises the following steps:preparing an aqueous solution containing dissolved silver nitrate and tin oxide particles in suspension, with the size of said particles measured in terms of specific surface area using the BET method lying between about 2 m.sup.2 /g and 6 m.sup.2 /g;causing silver nitrate to precipitate in silver hydroxide by rapidly adding a strong base and stirring, with silver hydroxide being unstable and transforming progressively into silver oxide;eliminating the ions from the solution and then the water in order to obtain a dry product; andheating the dry product to a temperature of about 200.degree. C. to 500.degree. C. in order to reduce the silver oxide to metallic silver.The invention is applicable to manufacturing electrical contacts for opening and closing in electromechanical apparatuses.

Abstract: The invention relates to a symmetrical power semiconductor device having peripheral connection slabs and to a method of fabricating such a device. An essentially polycrystalline P/N epitaxial layer (23) lies flush with a main face (S1) of the device by virture of grooves (21) obtained by etching and overlaid with a peripheral P/N zone (25). A P/N layer (22) is diffused between the epitaxial layer (23) and a monocrystalline N/P layer (20) in order to establish a junction (J2) which the grooves (21) and the peripheral zone (25) serve to bring out on the main face (S1). The invention is applicable to symmetrical bipolar devices, and in particular to gate-triggered thyristors.

Abstract: The invention relates to a removable memory cartridge for electronic equipment such as a programmable automaton, the cartridge being of the type comprising a box (101), a memory unit mounted in the box, an elongate connector fixed to the box, and grasping means provided on the box to enable the cartridge to be extracted by seaprating the connector. The grasping means comprise a flat member (110) hinged about an axis (114) lying at least approximately in the midplane of the connector, said flat member being suitable for occupying a first position against the box where it does not substantially increase the size thereof, and a second position away from the box in which it may be grasped in order to exert an extraction force on the box acting substantially level with the connector.

Abstract: The invention discloses a printed circuit card on which is welded at least an electronic component box as well as a thermal dissipator for dissipating the heat emitted by the component box. The component box and the thermal dissipator are respectively provided with clips and lugs which are engaged and welded in respective holes drilled in the card. A thermal drainage metallic area provided on a zone of the card located under the box forms a thermal adduction path between the box and the lugs of the thermal dissipator. This thermal drainage metallic area is further connected to a clip ensuring a privileged thermal drainage of the electronic component box.

Abstract: In a deformable system whereby electrical energy distribution conduits and conductors disposed longitudinally therein can be connected along a curved path, the system comprises a deformable central part containing a layer of conductors. Said central part comprises links hinged about axes parallel to the layer and perpendicular to the conductors, which latter are plastically deformable. They are solid conductors having a section which is flattened in the transverse direction of the layer of conductors. The said axes extend through the neutral axis of the conductors.Use to eliminate adverse elastic return movements of the system.

Abstract: The invention provides a device for controlling an electromagnet having a coil (L) connected to a monoarch periodic current supply source, through a controllable switch (TH). This switch (TH) is controlled by a control circuit comprising a member for detecting the zero cross-over times of the voltage of the source (R.sub.3, D.sub.4, IN.sub.1, R.sub.4, C.sub.3) and a switching device (FC) controlled by said detection member for delivering a closure signal to the switch (TH) following detection of a zero cross-over time which follows the order for controlling energization of the coil (L). The invention applies particularly to contactors and electromagnetic valves.

Abstract: An optical signalling device has a partially transparent envelope (2), a substantially U-shaped luminous tube (10) containing a gaseous atmosphere being placed within the envelope and supplied by a capacitor (C) which is charged and discharged by electric circuits placed on a printed circuit card (17).Within an insulating casing (4) having an end-wall (13) and side walls (14, 15), there is placed and maintained a printed circuit card (17) which carries conductive tracks (38, 39) soldered directly to the supply terminals (36, 37) of the gas tube (10). The gas tube is placed in a plane substantially parallel to a longitudinal axis of the casing and has two portions (32a, 33a) adjacent to the ends of its parallel arms (32, 33) which are securely clamped between two resilient lips (44) forming part of the end-wall (13) through which they pass. The bent region (35) of the tube extends externally of the end-wall and is protected by a transparent cover (5) of the envelope (2).

Abstract: A protected electric switching apparatus is provided and its fixing device, comprising a contactor with a latch for engaging a profiled rail and with which a removable thermal relay is associated by means of conducting pins. A channel is formed between two opposite walls so as to allow a screwdriver to have access to an eye of this latch.

Abstract: An electric connection terminal is provided with a braked screw, in particular for a contactor apparatus. One end of the screw, which projects from the threaded hole in which it is engaged, comes into transverse contact with a resiliently deformable tongue forming part of a portion of the apparatus.

Abstract: The invention provides a supply box for electric ducting able to be mounted at both ends of an electric distribution ducting. This box comprises a movable part with foolproof means which may be moved transversely with respect to the axis of the ducting, between a first position in which the foolproof means cooperate with associated foolproof means on the ducting so as to allow connection of the box to the ducting and a second position making such connection impossible. Marks provided on the movable part make it possible to identify the conductors of the box for each of the two positions.

Abstract: A key attached, for example, to the door of an electrical equipment cubicle is capable of sliding within a passageway so as to cause pivotal displacement of a cam and upward displacement of a push-rod, thus releasing a switch lug. A locking rod forming part of a slide-block which is coupled with the push-rod is capable of moving between a locking position in which an annular channel permits displacement of the key and an unlocking position in which the locking rod is engaged within a key notch. One end of the slide-block projects from the top face of the switching unit head in order to be downwardly displaced by an actuator, whereupon the key can be withdrawn without difficulty or danger.

Abstract: A device is provided for automatically dispensing terminals for electric cables into the receptacle of a reception part. The device includes a tubular body containing the terminals, means for causing a relative movement of the body and of the reception part, and resilient grippers mounted on the body and resiliently urged so as to close a lower orifice of the body and thus retain the terminals. An abutment is provided integral with the reception part for causing the grippers to open when the body and the reception part are brought into contact.

Abstract: A circuit breaker apparatus is provided with remote controlled opening and closing of its circuits and with supports for the mobile and fixed contacts which are adapted so as to promote repulsion forces which produce a limitation of the short circuit currents, in combination with a small mass of the mobile parts, the one supporting a retractable fixed contact being associated by an extension with a slide which is moved by the remote control electromagnet.

Abstract: An electric ducting comprises, inside a metal protection casing in the form of a tubular conduit, a flat support which extends in the longitudinal direction of the casing, over the whole length thereof, and which is formed by extruding an electrically insulating plastic material. The support is provided with parallel grooves arranged side by side, in each of which a current conducting bar is housed flat. For the same flat grooved extruded support, the conducting bars corresponding to different current ratings have the same general U-shape whose legs and base have respectively the same outer height and the same outer width whatever the current rating, only the thickness of the U-shaped bar varying as a function of the current rating.