EP0458190A1 - Dispositif de déclenchement pour manque de tension - Google Patents

Dispositif de déclenchement pour manque de tension Download PDF

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Publication number
EP0458190A1
EP0458190A1 EP91107923A EP91107923A EP0458190A1 EP 0458190 A1 EP0458190 A1 EP 0458190A1 EP 91107923 A EP91107923 A EP 91107923A EP 91107923 A EP91107923 A EP 91107923A EP 0458190 A1 EP0458190 A1 EP 0458190A1
Authority
EP
European Patent Office
Prior art keywords
release
armature
undervoltage
core
movement
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.)
Granted
Application number
EP91107923A
Other languages
German (de)
English (en)
Other versions
EP0458190B1 (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 conjunction 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 device motor from starting up again unintentionally when the voltage is recurring. The device may only be switched on again by manually operating the circuit breaker again.
  • circuit breakers While the former are primarily intended for installation in electromotively powered hand-held devices, the latter primarily serve to protect more powerful, permanently installed machines.
  • circuit breakers With regard to the usual size of electrical hand-held devices, circuit breakers have to be very compact and, because of the relatively low price level of these devices, must also be as simple and cheap as possible.
  • the size and price of the circuit breakers must be in reasonable proportion to the size and price of the electrical devices to be protected.
  • the requirements for size and simple structure do not exist to the same extent with motor protection switches. Here, the requirements for sensitivity, switching accuracy, switching line etc. are more in the foreground.
  • the generally higher price level of permanently installed machines also permits more complex training of the circuit breakers. One often finds relatively complex switch locks in motor protection switches. Due to the aforementioned differences, device circuit breakers and motor protection switches are also dealt with separately, for example in the standards.
  • 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 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 for the release force of the release spring which is translated according to the leverage ratio.
  • the required magnetic attraction force and thus the power loss can be reduced by appropriately dimensioning the lever transmission ratio.
  • the object of the invention is an undervoltage release device for a Specify device circuit breaker in which only a low power loss occurs, which nevertheless has a sufficiently high 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 easy and inexpensive to manufacture.
  • the tripping device is therefore initially 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 member 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 magnetic 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 magnet 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 former 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 cooperating 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 anchor 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 armature 20 performs a tilting movement between its attracted and its dropped position (left or right half in FIG. 7) around the hook-shaped ends 22 of its U-legs 21. Fastening and storage of the armature 20 are explained below.
  • the magnetic circuit could of course also be designed with a U-core, with the armature having to be designed differently.
  • 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, with no mechanical reworking of the pole faces being necessary.
  • the entire cross-sectional area of the pole faces can be dimensioned in a simple manner 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 bears 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 integrally formed on the adapter body in the area of the anchor bearings 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 carry out a trigger movement b on the adapter body 40, loaded by the trigger spring 17 and is in operative connection with both a pawl 38 on the coil body and with 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 protrudes 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 projects 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 member has two webs 55 which project laterally against the coil body and with which it engages under the armature 20. At each end of the webs 55, which is angled upward, 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 latched to the coil body 30. In any case, it is advantageous to provide the pawl with its sliding surface on one of the parts 30 and 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 latched onto 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 pawl-side lever arm 51 of the release member.
  • This torque causes the latch-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 reached over a certain free travel downward, 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 resting on 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 by the magnetically attracted armature, which prevents the release element from sliding off the pawl.
  • the device is triggered when the magnetic holding force on the armature 20 ceases to exist. Under the action of the above-mentioned 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 trigger 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 cause. The greater part of the release energy stored in the tensioned spring is available to the release element 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 trigger element 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 coil body 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)
  • Sink And Installation For Waste Water (AREA)
  • Transplanting Machines (AREA)
  • Emergency Protection Circuit Devices (AREA)
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
CH1774/90A CH680174A5 (fr) 1990-05-23 1990-05-23
CH1774/90 1990-05-23

Publications (2)

Publication Number Publication Date
EP0458190A1 true EP0458190A1 (fr) 1991-11-27
EP0458190B1 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
US5834996A (en) * 1996-04-18 1998-11-10 Ellenberger & Poensgen Gmbh Electric switch having undervoltage tripping
WO2015059191A1 (fr) * 2013-10-22 2015-04-30 Marquardt Verwaltungs-Gmbh Commutateur électrique, en particulier commutateur d'outil électrique

Families Citing this family (3)

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

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE697571C (de) * 1936-06-25 1940-10-17 Aeg Mit Zeitverzoegerung bei Spannungsrueckgang arbeitendes elektromagnetisches Schaltorgan
DE2800041A1 (de) * 1978-01-02 1979-07-12 Ellenberger & Poensgen Mehrpoliger null- oder unterspannungsschalter
EP0174382A1 (fr) * 1984-09-11 1986-03-19 Heinrich Kopp GmbH & Co. KG Boîtier de commutation variable pour disjoncteur (de protection) de moteur et à déclencheur par manque de tension, pour montage dans des outils électriques ou appareils similaires
FR2630583A1 (fr) * 1988-04-18 1989-10-27 Bassani Spa Dispositif de decrochage de tension minimale

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3708723A (en) * 1971-03-05 1973-01-02 Airpax Electronics Low power magnetic circuit breaker
GB1555611A (en) * 1976-03-31 1979-11-14 Matsushita Electric Ind Co Ltd High voltage switch for cooking apparatus 29037713092/77
US4544987A (en) * 1983-09-19 1985-10-01 Elmwood Sensors, Inc. Magnetically operated AC switching device with delay-on-dropout

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE697571C (de) * 1936-06-25 1940-10-17 Aeg Mit Zeitverzoegerung bei Spannungsrueckgang arbeitendes elektromagnetisches Schaltorgan
DE2800041A1 (de) * 1978-01-02 1979-07-12 Ellenberger & Poensgen Mehrpoliger null- oder unterspannungsschalter
EP0174382A1 (fr) * 1984-09-11 1986-03-19 Heinrich Kopp GmbH & Co. KG Boîtier de commutation variable pour disjoncteur (de protection) de moteur et à déclencheur par manque de tension, pour montage dans des outils électriques ou appareils similaires
FR2630583A1 (fr) * 1988-04-18 1989-10-27 Bassani Spa Dispositif de decrochage de tension minimale

Cited By (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
WO2015059191A1 (fr) * 2013-10-22 2015-04-30 Marquardt Verwaltungs-Gmbh Commutateur électrique, en particulier commutateur d'outil électrique
US10354822B2 (en) 2013-10-22 2019-07-16 Marquardt Verwaltungs-Gmbh Electrical switch, in particular a switch for an electrical power tool

Also Published As

Publication number Publication date
CH680174A5 (fr) 1992-06-30
AU647787B2 (en) 1994-03-31
ATE134458T1 (de) 1996-03-15
EP0458190B1 (fr) 1996-02-21
DE59107416D1 (de) 1996-03-28
AU7718191A (en) 1991-11-28
US5184101A (en) 1993-02-02

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