EP0458190B1 - Dispositif de déclenchement pour manque de tension - Google Patents

Dispositif de déclenchement pour manque de tension Download PDF

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Publication number
EP0458190B1
EP0458190B1 EP91107923A EP91107923A EP0458190B1 EP 0458190 B1 EP0458190 B1 EP 0458190B1 EP 91107923 A EP91107923 A EP 91107923A EP 91107923 A EP91107923 A EP 91107923A EP 0458190 B1 EP0458190 B1 EP 0458190B1
Authority
EP
European Patent Office
Prior art keywords
release
armature
undervoltage
core
spring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91107923A
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German (de)
English (en)
Other versions
EP0458190A1 (fr
Inventor
Kurt Ineichen
Peter Rüedi
Herbert Wirth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weber AG
Original Assignee
Weber AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Weber AG filed Critical Weber AG
Publication of EP0458190A1 publication Critical patent/EP0458190A1/fr
Application granted granted Critical
Publication of EP0458190B1 publication Critical patent/EP0458190B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/12—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by voltage falling below a predetermined value, e.g. for no-volt protection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/02—Housings; Casings; Bases; Mountings
    • H01H71/0207—Mounting or assembling the different parts of the circuit breaker
    • H01H2071/0242—Assembling parts of a circuit breaker by using snap mounting techniques

Definitions

  • the invention relates to an undervoltage release device for a circuit breaker according to the preamble of claim 1.
  • Tripping devices of this type are used in connection with circuit breakers for electrical devices which have electromotively driven parts. Their task is to trigger the circuit breaker if the operating voltage fails (or falls below a minimum value) and to prevent the motor of the device starting up again unintentionally when the voltage returns. It must only be possible to switch the device on again by manually operating the circuit breaker again.
  • undervoltage release devices for device circuit breakers on the one hand and for motor protection switches on the other hand
  • the above-mentioned differences also apply in principle. Due to the rather simple release mechanisms of device circuit breakers, however, the purely mechanical release force or available mechanical release work of undervoltage release devices for device circuit breakers must meet higher requirements than undervoltage release devices for motor circuit breakers with more complex, more easily releasable switch locks. In addition, with undervoltage release devices for device circuit breakers, the contamination problem must be taken into account more, since here the possibilities of preventing contamination from the outset alone are more limited than in the case of undervoltage release devices for motor protection switches.
  • the magnetic holding force must therefore compensate the release force of the release spring, which is translated according to the lever ratio.
  • the required magnetic attraction force and thus the power loss can be reduced by appropriate dimensioning of the lever transmission ratio.
  • the trip to the triggering device decreases disadvantageously.
  • EP A1 0 174 382 discloses a unit made of a motor protection switch and undervoltage release device which is integrated in a housing and is operatively connected to one another by means of a latching mechanism.
  • the latching technology essentially consists of an elongated lever member, which can be regarded as a trigger element, which is articulated with a switch on and a switch off, is under the action of a trigger or latch spring, at one end via a coupling piece with the Hinged armature of a magnet of the undervoltage release device is coupled and acts with its opposite end as a functional part of the switch lock of the motor protection switch, in that this end can be latched to a housing stop and thereby holds the motor protection switch in the switched-on position.
  • the latch can only be made when the anchor is tightened and is released as soon as the anchor falls off.
  • the magnet of the undervoltage release device is a direct current magnet and a rectifier is provided for feeding the magnet from the alternating current network to be monitored.
  • a disadvantage of this known arrangement is again the fact that the force of the release or latch spring rests fully on the armature in the direction of descent via the above-described linkage and must therefore be fully compensated for by the attraction force generated by the magnet.
  • anchor delivery it is purely passive.
  • the hinged anchor can fall under its own weight into the attracted position, which of course presupposes a certain spatial orientation of the entire arrangement.
  • the object of the invention is an undervoltage release device for a To specify device circuit breakers in which only a low power loss occurs, which nevertheless has a sufficiently large tripping force for tripping even circuit breakers that are difficult to trigger, with a sufficiently large tripping path of the tripping element, which is largely insensitive to contamination, with which a hum is avoided and which finally is still simple and inexpensive to manufacture.
  • the triggering device is therefore first of all characterized in that the electromagnet is a direct current magnet and that a rectifier is provided for rectifying the current flowing through the magnetic winding.
  • the use of a DC magnet instead of the usual AC magnet solves the annoying hum problem.
  • DC magnets have fewer components and are therefore simpler in construction than AC magnets. Time-consuming machining or treatment of the pole faces to reduce hum is eliminated. There are no magnetic losses in the core and in the armature.
  • the invention also provides for the release element to be latched in a self-releasing manner in the ready-to-release state, the latch being released automatically when the armature falls off. This makes it possible to measure the pulling force acting on the armature in the ready-to-release state to only a part of the total spring load acting on the release member, but without this having an adverse effect on the release path of the release member.
  • the undervoltage release device shown in FIGS. 1-5 has a direct current electromagnet with a magnet winding 3, a core 10 and an armature 20.
  • a cup-shaped housing 65 is provided to accommodate these elements.
  • a printed circuit board 66 which is equipped with rectifier diodes 67.
  • These circuit components are used to generate the supply direct current for the magnet winding 3 of the electromagnetic agent, starting from the alternating voltage to be monitored - normally mains alternating voltage.
  • series resistors are advantageously also provided to reduce the voltage and thus the power consumption of the winding.
  • Such series resistors are designated 69 in FIG. 5.
  • Zener diodes can also be provided to limit voltage peaks (not shown).
  • the voltage supply to the printed circuit board takes place via two connecting rods 68, and two conductive pins 39 serve for the direct current connection between the printed circuit board and the connections of the magnetic winding 3.
  • the triggering device is constructed symmetrically with respect to the central plane 28 shown in FIG. 1.
  • a coil body 30 serves as the supporting part, between the upper flange 31 and lower flange 32 of which the magnetic winding 3 is arranged (“above”, “below”, “vertically” etc. relates to the position of the Device according to FIGS. 1-5).
  • a cam 33 protrudes from the edge of the upper flange 31 on one side and there are two similar cams 33 'projecting from the flange 31 on the opposite side.
  • the housing 65 is snapped onto the coil body 30 by means of these cams.
  • On the top of the flange 31, upwardly projecting snap hooks 36 and guide webs 36 ′ adjacent thereto are formed (omitted in FIG. 1). These are used for snap connection of the triggering device to a supporting part 70 of a circuit breaker which interacts with the device, as is indicated in FIG. 3.
  • the core 10 of the electromagnet is a flat E-core (FIG. 4), the pole faces 14 of which are located on the flat sides of the legs 11 and 12.
  • the middle leg 11 of the core protrudes through a central longitudinal channel in the coil former 30, the free end with the pole face protruding beyond the lower flange 32.
  • the two side legs 12 of the core are located outside the winding 3 and lie opposite to their pole faces on the coil former.
  • the core 10 is held in the coil body 30 by means of snap hooks 35, which are formed on the upper flange 31 and engage over the yoke 13.
  • the armature 20 is an essentially U-shaped flat anchor, the U-legs 21 of which, as can be seen from FIG. 4, rest on the flat sides of the outer legs 12 of the E-core 10.
  • the anchor 20 leads between its attracted and its dropped position (left or right half in Fig. 7) Tilting movement around the hook-shaped ends 22 of its U-legs 21. Attachment and storage of the armature 20 are explained below.
  • the magnetic circuit could of course also be designed with a U-core, the armature having to be designed accordingly.
  • the described design of the magnetic circuit with a flat core and flat armature resting on the flat sides of its legs makes it possible to produce these parts as inexpensive stamped parts from cold-rolled sheet metal, mechanical post-processing of the pole faces not being necessary.
  • the entire cross-sectional area of the pole faces can be dimensioned in a simple manner to be larger than the total cross-sectional area of the legs of the core, which has a favorable effect on the attraction force in the event of contamination of the pole faces.
  • the adapter body 40 which crosses the winding 3 is rigidly connected to the wound bobbin 30.
  • the adapter body 40 essentially has two parallel side walls 42 and a central wall 41 connecting them. It is located completely on one side of the core 10 (on the right in FIGS. 2 and 3).
  • the adapter body is held on the side of the coil body by means of a resilient snap connection, which is produced by lateral advancement, a hook 43 engaging behind a notch on the upper flange 31 on both side walls 42 at the top (FIG. 4) and a cam 43 on the bottom in an edge notch on lower flange 32 is snapped.
  • adapter body 40 On each of its side walls, adapter body 40 has a guide track or guide link extending approximately in the axial direction of the winding of the electromagnet in the form of a groove 44.
  • a tilt bearing 45 for the armature 20 is formed on each of the side walls 42.
  • Each tilting bearing 45 lies against a flat side of an outer leg 12 of the core and receives the end 22 of a U leg 21.
  • the hook-shaped ends 22 also engage behind a resilient snap hook 46, which hooks are also formed on the adapter body in the area of the anchor bearing 45.
  • the armature 20 is thus positioned opposite the pole faces 14 of the core. However, it is free to perform a tilting movement between the attracted position (FIG. 2) and the dropped position (FIG. 3), the tilting axis being determined by the guidance of the leg ends 22 in the bearings 45.
  • the trigger member 50 is movably guided to perform a trigger movement b on the adapter body 40, loaded by the trigger spring 17 and is operatively connected to both a pawl 38 on the coil body and the armature 20.
  • the trigger element is designed as a pivotably mounted, two-armed lever, with a pawl-side (lower) lever arm 51 and an (upper) actuating lever arm 52; the pivot bearing is formed by two pins 53, each of which engage in one of the grooves 44 and are longitudinally guided therein.
  • Each of the pins 53 is located on a side arm 54 which projects from the actuating lever arm 52 and engages over a side wall 42 of the adapter body.
  • each side wall of the adapter body has a funnel-shaped recess 47 which opens into the groove from below, but has a smaller depth than the groove.
  • the trigger member 50 has two vertically running, aligned, continuous slots 59.
  • the cam 33 extending from the upper coil flange 31 projects through the upper of these slots, and a similar, but shorter cam 34 projects into the lower slot 59 and protrudes from the lower coil flange 32. This guiding of the slots 59 on the cams 33 and 34 prevents the triggering element 50 from tilting (as seen in FIG. 4) during its vertical sliding movements.
  • the pawl-side lever arm 51 of the release element has two webs 55 which project laterally against the coil former and with which it engages under the armature 20. At each end of the webs 55, which is angled upwards, a sliding edge 60 is formed, which is intended to cooperate with the pawl 38 located on both sides of the middle leg 11 of the core or its sliding surface 37.
  • the two sections of the pawl 38 are integrally formed on the coil body 30 at the bottom. It would also be conceivable to arrange the pawl on the adapter body 40 which is locked with the coil body 30. In any case, it is advantageous to provide the pawl with its sliding surface on one of the parts 30 or 40 mentioned, which are manufactured as plastic injection-molded parts; thanks to the high surface quality, low and constant friction can be achieved.
  • the armature 20 is guided on both flat sides between driving surfaces 57, which are located on the pawl-side lever arm 51, on the one hand at the ends of the webs 55 (in the vicinity of the sliding edge 60) and on the other hand on a cam 57 'which is between the two webs 55 is arranged.
  • the armature 20 has at its lower edge two recesses 25, into which the webs 55 protrude with some play in the triggered, upper end position of the release member (FIG. 3).
  • the trigger spring 17 is formed from a rectangular sheet metal blank with a window-like cutout.
  • a vertically standing surface 18 is inserted from below into a slot on the bobbin 30 and locked in place on the latter.
  • Two spring legs 19 extending from the surface 18 are angled to the side and lie in the region of their ends on a respective support edge 56, which are arranged below on the lever arm 51 of the release element on the latch side.
  • This torque causes the pawl side Lever arm 51 is pressed to the left against the pawl 38 and engages under it with its sliding edge 60 as soon as the latter comes under the sliding surface 37.
  • the driving surface 57 on the cam 57 takes the armature 20 in the tightening direction and brings it to the side against the core 10.
  • the armature is automatically mechanically advanced into the tightened position.
  • the grooves 44 allow the pin 53 or the entire trigger element after the latch has overlapped a certain free travel downwards, so that the element of the switch which exerts the feed force Z does not abut against a hard stop or, for this reason, be spring-loaded should.
  • the state ready for tripping according to FIG. 2 is maintained even after the infeed force Z has been eliminated.
  • This state is characterized in that the release member 50 is latched to the pawl 38, its edge 60 abutting the sliding surface 37 of the pawl 38.
  • the pawl 38 absorbs most of the spring load of the release element resulting from the tensioned release spring 17, however Due to the selected orientation of the sliding surface 37, a residual component of this spring load remains, by means of which the triggering element is urged to be discharged from the pawl. This component is compensated for by the magnetically attracted armature, which prevents the release element from sliding off the pawl.
  • the triggering of the device takes place when the magnetic holding force on the armature 20 ceases to exist. Under the action of the aforementioned residual component, the trigger element slides with the edge 60 from the pawl 38, the armature being carried along in the waste direction by the webs 55 overlapping it. It goes without saying that the residual component causing the release of the latch must be dimensioned sufficiently large to overcome the existing frictional resistances.
  • the release movement of the release member until the release of the latch is predominantly a pivoting movement, then predominantly a translatory movement upwards in direction b, which is given by the guide track 44 and is essentially transverse to the direction of the armature movement.
  • the latch is therefore designed to be self-releasing and is prevented from releasing itself by the anchor in the ready-to-release state. Active unlatching is not necessary. Due to the latching, the armature does not have to compensate for the full load on the release spring, but only a small part of it, which is just dimensioned sufficiently to prevent the edge 60 from sliding off the pawl 38 when the magnetic force disappears effect. The greater part of the release energy stored in the tensioned spring is available to the release member for most of its release movement after the release of the latch.
  • the trigger member 50 is expediently designed such that its two lever arms 51 and 52 are at least approximately balanced with respect to the pivot axis (bearing journal 53). This makes the trigger device highly shock-proof, i.e. safe against false triggering when impacted from outside.
  • the triggering device according to FIGS. 1-5 is especially designed with a view to economical production and assembly.
  • Coil body 30, adapter body 40 and release member 50 are designed as plastic injection molded parts. All components are held together by snap connections. The parts are joined together with linear joining movements in only two joining directions, namely on the one hand in the direction of the bobbin axis 29 and on the other hand perpendicular to it. This enables the extensive use of relatively simple assembly machines.
  • a self-releasing latching or latching according to the toggle lever principle could also be provided.
  • the release movement this is the best selected according to the type of training of the circuit breaker to be triggered.
  • a pure pivoting movement could be provided, for example.
  • the direction in particular of a translatory movement component, there is also largely freedom of design.

Landscapes

  • Breakers (AREA)
  • Massaging Devices (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Sink And Installation For Waste Water (AREA)
  • Transplanting Machines (AREA)

Claims (12)

  1. Dispositif de déclenchement pour manque de tension pour un disjoncteur de protection d'appareil muni d'un électro-aimant avec un enroulement d'électro-aimant (3), un noyau (10) et un induit (20), et d'un organe de déclenchement (50), lequel est capable d'effectuer un mouvement de déclenchement sous l'effet d'un ressort de déclenchement (17), l'électro-aimant étant un aimant continu et un redresseur (67) étant prévu pour le redressement du courant traversant l'enroulement d'électro-aimant, des moyens mécaniques (52, 53) étant prévus pour amener l'induit (20) dans la position attirée, l'induit (20) se trouvant dans une position attirée contre le noyau (10) dans l'état prêt au déclenchement, dans ce cas étant sollicité par ressort dans la direction de basculement mais le basculement depuis le noyau étant toutefois empêché (20) par la force d'attraction magnétique générée par l'électro-aimant, et l'organe de déclenchement (50) étant en outre sollicité dans cet état par le ressort de déclenchement, mais le mouvement de déclenchement étant toutefois empêché par l'induit (20) attiré, caractérisé en ce que l'organe de déclenchement (50) est encliqueté de manière auto-détachable dans l'état prêt au déclenchement, le cliquet (38) recevant la majeure partie de la sollicitation par ressort provenant du ressort de déclenchement tendu, seulement une composante résiduelle de cette sollicitation par ressort forçant l'organe de déclenchement (50) à glisser hors du cliquet (38) et l'induit (20) attiré étant également uniquement sollicité par cette composante résiduelle, et en ce que la majeure partie de l'énergie de déclenchement stockée dans le ressort de déclenchement tendu n'est libérée qu'au moment du détachement autonome de l'encliquetage.
  2. Dispositif de déclenchement pour manque de tension selon la revendication 1, caractérisé en ce qu'il est prévu une résistance de polarisation (60) pour la réduction du courant traversant l'enroulement d'électro-aimant.
  3. Dispositif de déclenchement pour manque de tension selon la revendication 1 ou 2, caractérisé en ce que l'induit et le noyau de l'électro-aimant sont conçus en tant que pièces plates avec des faces latérales planes et en ce que les faces polaires de l'induit et du noyau sont disposées sur des faces latérales mutuellement adjacentes.
  4. Dispositif de déclenchement pour manque de tension selon la revendication 3, caractérisé en ce que l'induit et le noyau sont des pièces découpées par estampage d'une tôle laminée, dont les faces polaires n'ont subi aucun usinage ultérieur.
  5. Dispositif de déclenchement pour manque de tension selon la revendication 3 ou 4, caractérisé en ce que le noyau est conçu en forme de E ou en forme de U et en ce que la section transversale totale des faces polaires est dimensionnée de manière à être supérieure à la section transversale totale de toutes les branches du E ou du U (11, 12) du noyau.
  6. Dispositif de déclenchement pour manque de tension selon l'une des revendications 1 à 5, caractérisé en ce que la sollicitation par ressort de l'induit et de l'organe de déclenchement dans l'état prêt au déclenchement est provoquée en commun par un ressort de déclenchement (17) unique tendu.
  7. Dispositif de déclenchement pour manque de tension selon la revendication 6, caractérisé en ce que seulement une partie relativement petite de l'énergie élastique stockée dans le ressort de déclenchement tendu est nécessaire pour détacher l'encliquetage de l'organe de déclenchement, la plus grande partie étant toutefois disponible pour son mouvement de déclenchement.
  8. Dispositif de déclenchement pour manque de tension selon l'une des revendications 1 à 7, caractérisé en ce que l'induit est amené de force par l'organe de déclenchement dans sa position attirée lorsque l'organe de déclenchement est amené par une intervention extérieure, dans la direction opposée au mouvement de déclenchement, dans sa position adoptée dans l'état prêt au déclenchement.
  9. Dispositif de déclenchement pour manque de tension selon l'une des revendications 1 à 8, caractérisé en ce que le mouvement de déclenchement de l'organe de déclenchement est essentiellement un mouvement de rotation jusqu'au détachement de l'encliquetage, puis est essentiellement un mouvement de translation.
  10. Dispositif de déclenchement pour manque de tension selon la revendication 9, caractérisé en ce que l'organe de déclenchement est conçu en tant que levier à deux bras équilibré de préférence autour de son axe de pivotement avec un bras de levier du côté de l'induit (51) et un bras de levier de déclenchement ou de rappel (52) et en ce que l'axe de pivotement de ce levier à deux bras est placé de manière déplaçable dans une coulisse de guidage longitudinale (44).
  11. Dispositif de déclenchement pour manque de tension selon la revendication 10, caractérisé en ce que l'organe de déclenchement est disposé essentiellement du côté de l'induit latéralement à côté de celui-ci par rapport à la direction de l'axe de l'enroulement de l'électro-aimant et en ce que la coulisse de guidage et par conséquent la partie en translation du mouvement de déclenchement de l'organe de déclenchement est orientée essentiellement parallèlement à cette direction de l'axe, ainsi qu'en s'éloignant de l'induit.
  12. Dispositif de déclenchement pour manque de tension selon les revendications 8 à 11, caractérisé en ce que le bras de levier de déclenchement ou de rappel (52) de l'organe de déclenchement présente une face oblique (58) pour l'application d'une force d'approche (Z), disposée à angle oblique par rapport à la direction longitudinale de la coulisse de guidage (44), afin de produire, dans le cas d'une force d'approche agissant essentiellement dans cette direction, d'une part une composante de force dans cette direction, et d'autre part également un moment de rotation autour de l'axe de pivotement de l'organe de déclenchement.
EP91107923A 1990-05-23 1991-05-16 Dispositif de déclenchement pour manque de tension Expired - Lifetime EP0458190B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1774/90 1990-05-23
CH1774/90A CH680174A5 (fr) 1990-05-23 1990-05-23

Publications (2)

Publication Number Publication Date
EP0458190A1 EP0458190A1 (fr) 1991-11-27
EP0458190B1 true EP0458190B1 (fr) 1996-02-21

Family

ID=4218298

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91107923A Expired - Lifetime EP0458190B1 (fr) 1990-05-23 1991-05-16 Dispositif de déclenchement pour manque de tension

Country Status (6)

Country Link
US (1) US5184101A (fr)
EP (1) EP0458190B1 (fr)
AT (1) ATE134458T1 (fr)
AU (1) AU647787B2 (fr)
CH (1) CH680174A5 (fr)
DE (1) DE59107416D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7722444B2 (en) 2005-05-13 2010-05-25 Black & Decker Inc. Angle grinder
US10818450B2 (en) 2017-06-14 2020-10-27 Black & Decker Inc. Paddle switch

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5834996A (en) * 1996-04-18 1998-11-10 Ellenberger & Poensgen Gmbh Electric switch having undervoltage tripping
DE102014015410A1 (de) * 2013-10-22 2015-04-23 Marquardt Verwaltungs-Gmbh Elektrischer Schalter, insbesondere Elektrowerkzeugschalter
CN106486325B (zh) * 2016-11-24 2018-04-13 贵州泰永长征技术股份有限公司 一种自复式过欠压保护结构

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DE697571C (de) * 1936-06-25 1940-10-17 Aeg Mit Zeitverzoegerung bei Spannungsrueckgang arbeitendes elektromagnetisches Schaltorgan
US3708723A (en) * 1971-03-05 1973-01-02 Airpax Electronics Low power magnetic circuit breaker
AU505529B2 (en) * 1976-03-31 1979-11-22 Matsushita Electric Industrial Co., Ltd. i HIGH VOLTAGE SWITCH FOR COOKING APPARATUS
DE7800032U1 (de) * 1978-01-02 1978-05-18 Ellenberger & Poensgen Gmbh, 8503 Altdorf Mehrpoliger Null- oder Unterspannungsschalter
US4544987A (en) * 1983-09-19 1985-10-01 Elmwood Sensors, Inc. Magnetically operated AC switching device with delay-on-dropout
WO1986001936A1 (fr) * 1984-09-11 1986-03-27 Heinrich Kopp Gmbh & Co. Kg Boitier de commutation pour un interrupteur (de protection) du moteur et dispositif de declenchement pour installation dans des appareils electriques
FR2630583B1 (fr) * 1988-04-18 1994-05-27 Bassani Spa Dispositif de decrochage de tension minimale

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7722444B2 (en) 2005-05-13 2010-05-25 Black & Decker Inc. Angle grinder
US8087976B2 (en) 2005-05-13 2012-01-03 Black & Decker Inc. Trigger assembly for angle grinder
US8087977B2 (en) 2005-05-13 2012-01-03 Black & Decker Inc. Angle grinder
US10818450B2 (en) 2017-06-14 2020-10-27 Black & Decker Inc. Paddle switch

Also Published As

Publication number Publication date
AU647787B2 (en) 1994-03-31
CH680174A5 (fr) 1992-06-30
ATE134458T1 (de) 1996-03-15
AU7718191A (en) 1991-11-28
EP0458190A1 (fr) 1991-11-27
US5184101A (en) 1993-02-02
DE59107416D1 (de) 1996-03-28

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