baber/WOPTO huggingface dataset:
Patent FR-2057503-A5 (FR)
Title: Separating carbon dioxide and hydrogen - sulphide from gas mixtures
IPC: C10K1/12
Filed: 1969-08-22
Granted: 1971-05-21
Abstract: and/or H2S is removed from gas mixtures by washing with aq. alkaline soln. which can later be regenerated. Process comprises washing under pressure, removing streams, which are then regenerated, are in a high pressure zone, the other in a low pressure zone. When the pressure in the high pressure zone is produced, the mixture cools to produce steam, which is then used to strip the low pressure zone. Finally, both regenerated streams are returned to the absorbing zone.
Patent FR-2102876-A5 (FR)
Title: Direct positive photocopies/photoresists - from azide polymer by dyeing or dissolving uncrosslinked parts
IPC: G03F1/56
Filed: 1970-08-27
Granted: 1972-04-07
Abstract: Prodn. of direct positive photocopies of photo-resists comprises exposing film with cross-linkable photosensitive coating to actinic light and either a) dyeing positive image with soln. of dyestuff in organic solvent which does not dissolve the coating material and removing uncoupled dyestuff from surface of film, to produce direct positive copy; or b) rinsing film with organic solvent which dissolves amorphous and uncross-linked material, to produce photo-resist. Various polymers which can absorb dyestuff are suitable, e.g. polyvinyl alcohol p-azidobenzoate, polyvinyl cinnamate, polymer contg. coumarin gps., polyvinyl benzal acetophenone and bisacrylic monomer mixed with cross-linkable polymer. Same material can be used for prodn. of positive and negative copies by varying subsequent treatment.
Patent FR-2127208-A5 (FR)
Title: Yarn cutter - for sewing machine uses electrically heated wire for cutting
IPC: D05B65/00
Filed: 1971-02-22
Granted: 1972-10-13
Abstract: The cutter device includes a pref. U-shaped wire of electrically conductive material having the ends of its parallel branches mounted in insulating supports. The wire is electrically heated to a temp. above the melting or decomposition temp. of the yarn to be cut, and a yarn catcher catches the yarn and applies it against the heated cross branch of the wire. Pref. the wire is maintained at a constant temp. below its max. temp. by a first heating circuit and is heated rapidly to its max. temp. by a second heating circuit. The cutter operates effectively with yarn thicknesses of 1/10-2 mm, and does not require frequent adjustment.
Patent FR-2099757-A5 (FR)
Title: Polystyrene filler - for lightweight gypsum mouldings
IPC: C04B16/08
Filed: 1971-06-21
Granted: 1972-03-17
Abstract: Uniform material bound with water consists of calcined gypsum or Portland cement with fibrous or shredded foamed polystyrene additions, the latter amounting to 0.01 to 5 wt %. Pref. 0.05 to 3 wt. % may be added if gypsum is used and 0.01-5% wt. Portland cement is used which may be used either as a mortar or a cement. The material is considerably lighter than ordinary gypsum components.
Patent FR-2158621-A5 (FR)
Title: Hollow welding electrode - contg a filler material and undulating metal rod or wire
IPC: B23K35/40
Filed: 1971-10-26
Granted: 1973-06-15
Abstract: Hollow electrode for electric arc welding or recharging comprises a tubular metal fluid tight sheath enclosing granular elements and/or components which improve the welding etc. operation and an elongate metal rod or wire. The rod or wire is curvilinear and its extended length is greater than that of the sheath.
Patent FR-2113428-A5 (FR)
Title: Paint stripper - contains an acetal of a diol
IPC: C09D9/00
Filed: 1971-10-29
Granted: 1972-06-23
Abstract: Strippers and solvent for hardened paints and varnishes contains an acetal of a diol of formula: (where R and R1 are H, CH3, CH(CH3)2 and n is 1-5. The acetal may be derived from formaldehyde (eg. 1,3-dioxolane) 30-90% (pref. 50-90%) of the acetal is used in ketone or ester soln. The acetals are physiologically harmless and have an agreeable smell. They are readily mixed with solvents and diluents.
Patent FR-2163884-A5 (FR)
Title: Continuous alkyl carbonate prepn - by reacting alkyl chloroformate and alcohol in packed column
IPC: C07C67/00
Filed: 1971-12-03
Granted: 1973-07-27
Abstract: Reaction is effected in the liq. phase in a packed column acting as a distn. column in a state of total reflux. Reaction is accelerated, since optimum reactant concns. are present at all points in the column, and degassing is facilitated. For ethyl carbonate, 90% yield is obtd. with residence time 2 hrs.
Patent FR-2122963-A5 (FR)
Title: Bleaching cellulose pulp - using buffered hypochlorination to minimise colour of waste liquor
IPC: D21C9/14
Filed: 1972-01-19
Granted: 1972-09-01
Abstract: Cellulose pulp is bleached by (a) treatment in aq. suspension with Cl2 or ClO2 to solubilise the non-cellulose materials and (b) treatment with 0.5-3.0% hypochlorite (dry pulp basis) for 15-180 min. at ca. 24-71 degrees C and pH 7-9, corresp. to 3-15 wt.% hypochlorination. The waste liquor contains 50-90% less colouring matter than when alkaline extraction of the solubilised non-cellulose materials is employed. During hypochlorination the pH is kept at pref. 7.5-8.5 esp. 7.8-8.2 pref. using 0.5-1% Na silicate as buffer. This treatment pref. is carried out for 30-90 min. at 38-71 degrees C.
Patent FR-2185125-A5 (FR)
Title: Label carrier - of plastics strip, for documents
IPC: B42F21/08
Filed: 1972-05-18
Granted: 1973-12-28
Abstract: Teeth on one edge engage in the perforations of the document file. Preferably the strip is extruded; at the extruder exit, it engages in a slide with toothing punch(es) and with a convex wall. The strip is temporarily arrested against a positionable stop and passes in front of the path of a sectioning knife, whose action, and that of the punches, are related to the extrusion speed.
Patent FR-2188502-A5 (FR)
Title: Roughened, plush inking roller - for optimum inkingon letterpress/offset rotary/sheet-fed machines
IPC: B41F31/26
Filed: 1972-06-02
Granted: 1974-01-18
Abstract: Inking roller for printing machines, esp. letterpress and offset rotary or sheet-fed machines, has a metal core, acting as axle for mounting the roller, with 2 synthetic rubber layers of differing hardness, the oter layer, which is the harder, contg. (a) is not >25% short cellulose fibres, (b) is not >20% fine particles of lithorgrahic leather and (c) >25 (16)% polyurethane elastomer, w.r.t. the wt. of the synthetic rubber in which this mixt. is dispersed. This roller gives optimum inking, considerable redn. in wetting and in bunching and dusting of the paper, is abs. antistatic and does not lead to the formation of bright spots.
Patent FR-2193351-A5 (FR)
Title: Lightweight construction matl - of impregnated organic fibres and polyure-thane or polystyrene hard foam bonding agent
IPC: E04C2/16
Filed: 1972-07-21
Granted: 1974-02-15
Abstract: The org. fibre material of wood fibre, sea weed, straw or wood shavings etc, is pre-treated with an impregnating agent based on tar oil and bitumen, phenols, chlornapthaline, or urea formaldehyde condensates, prior to bonding and additional fillers. Pref. plastic fibres, splinters or shavings with a dia. >=0.3 mm are added.
Patent FR-2153969-A5 (FR)
Title: Adhesively securing elements - in hole in wall by adhesive pvc foam
IPC: F16B11/00
Filed: 1972-09-12
Granted: 1973-05-04
Abstract: Head at the end of the shaft has a shoulder-extending outward and facing the shaft. A piece of the foam is bonded to the shoulder. Pref. the shaft is circular and has a bore into which a screw can be screwed and tightened.
Patent FR-2230172-A5 (FR)
Title: Hydraulic control system for paper press - has double acting rams controlled by high and low pressure pumps
IPC: F15B11/02
Filed: 1973-05-16
Granted: 1974-12-13
Abstract: Hydraulically authorised paper press 41 locates multiple sheets during cutting utilising high and low ambient oil pressures for cutting and pedal descent respectively, the latter a security measure. Dispenses with manual pressure control and mechanical pedal control. The double acting jack 2, 3 operated press embodies a circuit linking pump 6 with lower jack chamber 21, 31, a circuit likewise but to the upper jack chamber 22, 32 and incorporating a sequence valve 1 calibrated to a pressure necessary to maintain the press in the elevated position, and a return circuit to a reservoir 67 below the valve; an electrohydraulic unit 5 regulating and limiting pressure to three levels, low as described, enhanced to overcome the low pressure, and high, to secure paper during cuttings.
Patent FR-2315828-A5 (FR)
Title: Small manual suction or discharge pump e.g. for petrol transfer - opt. having polyethylene body components and flexible hose
IPC: G01F11/02
Filed: 1973-08-28
Granted: 1977-01-21
Abstract: Manual pump is suitable for drawing a sample of liquid up a length of tubing, and subsequently discharging via the same tube. The pump body comprises two coaxial metal or plastic tubes each closed at one end and nested mouth to mouth. The outer tube has internal peripheral seals which can slide along the body of the inner tube. One tube is fitted with a short outlet neck having a lipped rim over which an elastic hose end can be fitted. The neck can be sealed, pref. by an integral pivoting cap. Device is esp. used as a cheap portable pump, for e.g. transferring petrol from one vehicle to another, being safer and more pleasant to use than a simple siphon tube primed by mouth suction.
Patent CH-694493-A5 (CH)
Title: Missile atomic clock operating device incorporates a sealed housing for the clock together with a heating arrangement for maintaining a constant clock temperature
Inventor: LEHNER ANDREAS
IPC: B60R11/02
Filed: 2004-09-16
Abstract: The device for interference free operation of an atomic clock carried in a missile. The atomic clock is fastened on a metal plate, which in turn is supported with a number of springs, especially piano wire type springs (3) on mounting blocks (4). The latter are fastened to a base plate of a sealed housing which also contains a heating arrangement for ensuring an essentially constant clock temperature.
Patent DD-149936-A5 (DD)
Inventor: SKRZEC ADAM E
IPC: C07C323/26
Filed: 1980-03-31
Abstract: A thiophenol is produced by a process which consists in reacting hydrogen sulfide and a source of hydrogen with a halogenated aromatic compound. The total conversion of the reaction is improved by increasing the reaction temperature as the total conversion decreases optionally independently of the presence of hydrogen. The process produces high yields of thiophenol with low quantities of byproduct aromatic thioethers, particularly diphenyl disulfide.
Patent DD-202439-A5 (DD)
Title: Verfahren zur herstellung von acyloxysteroiden
Inventor: NITTA ISSEI
IPC: C07J41/00
Filed: 1982-07-21
Abstract: Beschrieben wird ein Verfahren zur Herstellung von als wertvolle neue Zwischenprodukte fuer die Herstellung von Corticoiden, wie Hydrocortison und Prednisolon geeigneten Acyloxysteroiden der allgemeinen Formel I, worin die gestrichelten Linien in den Ringen unabhaengig voneinander Eifachbindungen oder Doppelbindungen, A eine Acyloxygruppe und Y Br, Br tief 2, I oder I tief 2 bedeuten, welches darin besteht, eine 17beta-Ethinyl-17alpha-acyloxysteroid der allgemeinen Formel II, worin die gestrichelten Linien und A die oben angegebenen Bedeutungen besitzen, mit einem positive Bromionen oder positive Jodionen freisetzenden Halogenierungsmittel umsetzt und gegebenenfalls das erhaltene Dihalogensteroid der allgemeinen Formel I, worin Y fuer Br tief 2 bzw. I tief 2 steht, mit einem Phosphit reduziert bzw. mit einem Dithionit reduziert oder mit einem ein Wasserstoffatom aufweisenden organischen Loesungsmittel behandelt.
Patent DD-211582-A5 (DD)
Title: Verfahren zur herstellung von ergopeptinderivaten
Inventor: KOBEL HANS
IPC: C07D513/04
Filed: 1982-08-06
Abstract: Die Erfindung betrifft ein Verfahren zur Herstellung von cyclischen 9'-Thiapeptidergotalkaloiden, die von fermentativ herstellbaren 9'-Methylen-peptidergotalkaloiden abgeleitet sind. Das erfindungsgemaesse Verfahren zeichnet sich dadurch aus, dass man einer fluessigen Kultur eines die entsprechende 9'-Methylen-Verbindung produzierenden Stammes L-Thiazolidin-4-carbonsaeure oder ein Salz dieser Saeure zugibt und die erhaltene Verbindung gewuenschtenfalls in ein Saeureadditionssalz ueberfuehrt. Die erfindungsgemaess hergestellten Verbindungen weisen Dopaminrezeptoren stimulierende, Prolaktin-sekretionshemmende, gefaesstonisierende, antidepressive und vigilanzerhoehende Eigenschaften auf.
Patent DD-231789-A5 (DD)
Title: Verfahren zur herstellung von triazol-derivaten
Inventor: GYMER GEOFFREY E
IPC: A61P31/04
Filed: 1983-09-29
Abstract: Die Erfindung betrifft ein Verfahren zur Herstellung von Triazolderivaten, die als Fungizide verwendbar sind.
Patent DD-298626-A5 (DD)
Title: Verfahren zur herstellung von reinen erdalkalimonofluoromonophosphaten
Inventor: MOEWIUS FRANK
IPC: C01B25/32
Filed: 1987-09-03
Abstract: Erfindungsbetreff ist ein Herstellungsverfahren von reinen Erdalkalimonofluoromonophosphaten MPO3F, die als Fluoridierungs-, Korrosionsschutz- und Holzschutzmittel einsetzbar sind. Erfindungsgemaesz wird eine Phosphorverbindung in Form einer * &z. B. Erdalkaliphosphate, Phosphorsaeure, * und ein Erdalkali- oder Ammoniumfluorid oder -hydrogenfluorid oder Fluorwasserstoffsaeure, und gegebenenfalls eine Erdalkaliverbindung, deren Anion beim Erhitzen fluechtig geht (z. B. Erdalkalihydroxid, Erdalkalicarbonat, Erdalkalihydrogencarbonat), bei 180 bis 500C und einem Atomverhaeltnis von M:P:F1:1:1 bis 1,1 zu MPO3F umgesetzt, worin MMg, Ca, Sr oder Ba ist, und wobei die Ausgangsverbindungen mindestens 1 Mol H2O pro Mol Endprodukt MPO3F enthalten oder eine entsprechende Menge Wasser hinzugesetzt wird.{Erdalkalimonofluoromonophosphate; Fluoridierungsmittel; Korrosionsschutzmittel; Holzschutzmittel; * Erdalkaliphosphate; Phosphorsaeure; * Erdalkalifluorid; Ammoniumfluorid; Erdalkalihydrogenfluorid; Ammoniumhydrogenfluorid}
Patent DD-272405-A5 (DD)
Title: Fungizide mittel
Inventor: SCHAPER WOLFGANG
IPC: A01N43/653
Filed: 1987-03-10
Abstract: Die Erfindung betrifft fungizide Mittel, die als Wirkstoff ein 1-Hydroxy-1-azolylmethyl-benzocycloalken-Derivat der allgemeinen Formel IIenthalten, in der die Substituenten die in der Beschreibung angegebene Bedeutung aufweisen. Formel II
Patent DD-284736-A5 (DD)
Title: Faltenbalganordnung
Inventor: MAHNKE PETER-JOERG
IPC: F16K41/10
Filed: 1989-06-05
Abstract: Die Erfindung betrifft eine Faltenbalganordnung fuer Armaturenspindeln, die vorrangig fuer Einsaetze in inkompressiblen Medien verwendet wird. Die Aufgabe bestand darin, eine Faltenbalganordnung zu entwickeln, die beim Einsatz in inkompressiblen Medien unter allen Betriebsbedingungen funktionstuechtig arbeitet, d. h. unzulaessige Druckanstiege, die zum Ausfall des Faltenbalges oder anderer Bauteile fuehren koennen, vermeidet. Erfindungsgemaesz wird die Aufgabe dadurch geloest, dasz eine Anordnung mit Faltenbaelgen geschaffen wurde, die die Volumenaenderungen, z. B. durch Betaetigen einer Spindel, und die damit verbundene Druckaenderung kompensieren kann.{Faltenbalg; Armaturenspindel; inkompressible Medien; Druckaenderung; kompensieren}
Patent DD-288644-A5 (DD)
Title: Brennkraftmaschine mit einrichtung zur verbesserung der waermeumwandlung
Inventor: POMPER LOTHAR
IPC: F02B41/00
Filed: 1989-10-25
Abstract: Die Erfindung betrifft eine Brennkraftmaschine mit Einrichtung zur Verbesserung der Waermeumwandlung insbesondere fuer stationaere und mobile Anlagen. Die Erfindung hat den Zweck, einen Teil der Verlustwaerme herkoemmlicher Brennkraftmaschinen in mechanische Energie umzuwandeln. Dieses Ziel wird dadurch erreicht, dasz die heiszen Zylinderbuchsen und -koepfe der Stufen einer Brennkraftmaschine die Funktion eines Dampferzeugers uebernehmen, der sich aus der Kuehlfluessigkeit entwickelnde Naszdampf einem von den heiszen, entspannten Verbrennungsgasen umspuelten Waermetauscher zugefuehrt, ueberhitzt wird und in einer nachgeschalteten Dampfmotorstufe, die direkt oder indirekt an die Kurbelwelle eines Verbrennungsmotors angekoppelt ist, zur Gewinnung von mechanischer Arbeit entspannt und dem Kuehlkreislauf wieder zugefuehrt wird.{Brennkraftmaschine; Verbesserung der Waermeumwandlung; Brennkraftmaschine als Dampferzeuger mit Dampfmotor}
Patent DD-296132-A5 (DD)
Title: Verfahren zur behandlung von ablagerungen
Inventor: QUAAK MARINUS P
IPC: E02B3/02
Filed: 1990-02-22
Abstract: Die Erfindung bezieht sich auf ein Verfahren zur Behandlung von Ablagerungen, die sich am Grund eines Gewaessers abgelagert haben. Um insbesondere phosphathaltige Ablagerungen auf relativ einfache und kostenguenstige Weise behandeln zu koennen, wird erfindungsgemaesz ein Behandlungsmittel, das aus nicht gasfoermigen Bestandteilen, wie beispielsweise eine Loesung oder eine waeszrige Dispersion eines phosphatbindenden Mittels, z. B. Eisensalz, besteht, ueber Duesen in die Ablagerungen eingespritzt.{Behandlungsverfahren; Sedimentationen; phosphathaltige Ablagerungen; Behandlungsmitte; Loesung; waeszrige Dispersion; Gewaessergrund}
Patent DD-295249-A5 (DD)
Title: Verfahren zur einstellung von schaltschwellen bei der impulsverarbeitung
Inventor: HOFFMANN JOERG
IPC: G01R23/16
Filed: 1990-06-11
Abstract: Die Erfindung betrifft ein Verfahren zur Einstellung von Schaltwellen bei der Impulsverarbeitung, bezieht sich also auf das Gebiet der Verarbeitung elektronischer Signale. Sie eignet sich besonders fuer die Justierung von Schaltwellen in rechnergestuetzten Systemen. Die Schaltschwelle eines von einem Digital-Analog-Wandler angesteuerten Schwellwertschalters wird in Stufen erhoeht, bei jeder Stufe innerhalb einer konstanten Zeit die Summe der Impulse abgespeichert und aus dem sich ergebenden Zusammenhang zwischen den Impulssummen und den Schaltschwellen aufgrund eines vorgegebenen Kriteriums der Wert der einzustellenden Schaltschwelle ermittelt und an den Digital-Analog-Wandler gegeben.{Impulsverarbeitung; Schaltschwelle; Justierung; Digital-Analog-Wandler; Rechner}
Patent BE-1013018-A6 (BE)
Title: Poop scoop
IPC: E01H1/12
Filed: 1998-11-04
Granted: 2001-08-07
Abstract: A device including a body (10) composed of two parts (11, 12) articulatedaround at least one hinge (13) on one of their sides so as to form a clipwith an inner compartment and a scraper edge on one of the aforementionedparts at least. The external surfaces of said part (11, 12) are provided withmeans (17, 18) to accommodate the thumb and the other fingers of the hand,respectively, in such a way that the aforementioned parts may be separatedangularly from each other by simply opening the hand. A piece of excrementlying on the ground may thus easily and cleanly be picked up and taken awayto be subsequently discarded or eliminated.<IMAGE>
Patent ES-2001670-A6 (ES)
Title: Diphenyl ether herbicides.
Inventor: CLARK MICHAEL THOMAS
IPC: A01N43/12
Filed: 1986-09-09
Abstract: Phenoxy phthalide derivatives having the general formula < CHEM > wherein R1 represents a hydrogen or halogen atom or an alkyl or haloalkyl group R2 and R3, which may be the same or different, each independently represents a hydrogen or halogen atom or an alkyl, haloalkyl, nitro or cyano group and R4 and R5, which may be the same or different, each independently represents an alkyl group. Processes for the preparation of such compounds, herbicidal compositions containing them, and their herbicidal use.
Patent ES-2006187-A6 (ES)
Title: Tamper evident composite closure
Inventor: HAYES THOMAS H
IPC: B65D39/08
Filed: 1987-06-26
Abstract: The closure has a cover fitted into a moulded plastics ring and having container engaging members on the radially inner surface of the ring. The ring comprises a relatively thin cylindrical member with a cover receiving groove positioned downwardly from the ring top and engaging the outer edge of the cover portion. - The container engaging members comprise continuous threads. The outer dia. of the groove is greater than the inner dia. of the continuous threads, facilitating the insertion of the cover through the top of the ring. (Dwg.2/7) EPAB- EP-314684 B A composite closure (1) for a container (11), the closure comprising a cover (2) and a separate moulded plastic ring (3), into which the cover is arranged to fit, the ring having closure securing members (12) on a radially inward surface of the ring below the cover for tightening and removing the cover on to and from a container, the ring having a relatively thin cylindrical member having a cover-receiving groove (5) positioned above the securing members, the ring having an opening in the top of the ring through which the cover can be inserted into the groove, the cover having an outer edge (7) which is engaged in the groove, the outside diameter of the cover being greater than the inside diameter of the securing members on the ring, and said ring including a tamper-indicating band (14) defined by a line of weakness (18) and forming the bottom portion of the ring, the band having container engaging means (15) projecting upwardly and inwardly from its lower edge. (Dwg.2/7)
Patent ES-2008173-A6 (ES)
Title: Process and apparatus for initiating data acquisition devices, in particular those for seismic data.
IPC: H04Q9/00
Filed: 1987-08-14
Abstract: 1. Method for the initialisation of equipment for the acquisition of seismic data, distributed along a seismic profile to be surveyed, each unit being designed to receive the signals transmitted by sensors, to process these and record them and, when commanded by a central laboratory, to transfer to it the data relating to the said signals, in accordance with a selected transmission channel, characterised in that it consists of using a system of light transmission which comprises a first mobile control device and a number of secondary devices associated respectively with the various different data acquisition units, the first mobile control device being transported into the vicinity of each of the data acquisition units in succession and the operational parameters being transmitted to the said data acquisition units.
Patent ES-2005980-A6 (ES)
Title: Controlling idling speed in internal combustion engines
Inventor: HENNING MANFRED
IPC: F02D31/00
Filed: 1987-12-11
Abstract: In an arrangement in which derived and actual engine speeds are compared at 12 and any error is input to a positioner 14 to control a throttle valve actuator 8 to set the idle position of a throttle valve 4, a switch 9 detects whether a throttle valve lever 6 is bearing against the actuator. During idling the switch is closed and there is feedback of the actual position of the throttle valve from a potentiometer. However when the switch is open, a stored value of throttle valve position is transmitted to the valve positioner 14 instead.
Patent ES-2006551-A6 (ES)
Title: Decatizing method and apparatus
Inventor: RIEDEL DIETER
IPC: D06C7/00
Filed: 1988-02-05
Abstract: The initial moisture content of textile material to be decatized and fixed is controlled by a feedback-type regulator circuit which is responsive to measured values of the water content of vapor clouds produced as the material emerges from its passage around a steaming cylinder. The moisture content is preferably controlled by regulating the amount of water applied by a moistening device upstream of the steaming cylinder.
Patent ES-2013125-A6 (ES)
Title: Cable-actuated emergency stop switch
Inventor: PICCOLI JEAN-LUC
IPC: H01H15/10
Filed: 1989-03-22
Abstract: A piston operated by a cable stretched out within hand reach along a dangerous zone actuates a tappet whose movements are transmitted to a slider. The slider in turn compresses a spring until in a first phase, before any switch actuation, a pawl engages a groove in the slider. This prevents return of the tappet to its rest position, whereby any attempt to simulate a machine breakdown by fraudulent actuation of the device leaves a trace in the device even before effective switch actuation has occurred. In a second phase the force of the spring exceeds the force necessary to retract locking pins of a striker which is therefore released abruptly to operate the switch. To restore the device to its standby state, a lock plug carrying a cam adapted to release the pawl from the groove in the slider is rotated by means of a key.