EP1867820A1 - Dispositif de maintien pouvant être surveillé - Google Patents

Dispositif de maintien pouvant être surveillé Download PDF

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Publication number
EP1867820A1
EP1867820A1 EP07405117A EP07405117A EP1867820A1 EP 1867820 A1 EP1867820 A1 EP 1867820A1 EP 07405117 A EP07405117 A EP 07405117A EP 07405117 A EP07405117 A EP 07405117A EP 1867820 A1 EP1867820 A1 EP 1867820A1
Authority
EP
European Patent Office
Prior art keywords
core
yoke
magnetic
magnetic circuit
locking device
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
EP07405117A
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German (de)
English (en)
Other versions
EP1867820B1 (fr
Inventor
Max Schmid
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.)
Pilz Auslandsbeteiligungen GmbH
Original Assignee
Elesta Relays GmbH
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Filing date
Publication date
Application filed by Elesta Relays GmbH filed Critical Elesta Relays GmbH
Publication of EP1867820A1 publication Critical patent/EP1867820A1/fr
Application granted granted Critical
Publication of EP1867820B1 publication Critical patent/EP1867820B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05C—BOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS
    • E05C19/00—Other devices specially designed for securing wings, e.g. with suction cups
    • E05C19/16—Devices holding the wing by magnetic or electromagnetic attraction
    • E05C19/166—Devices holding the wing by magnetic or electromagnetic attraction electromagnetic

Definitions

  • the invention relates to an observable locking device with an electromagnet and a yoke suitable for the electromagnet for locking a part to be kept closed for safety, and with a sensor for monitoring the state of the locking device.
  • an access protection device which comprises a magnetizable yoke on a movable part and an electromagnet which can be closed with the yoke on a fixed part.
  • the access protection device is also provided with a sensor unit which can emit and receive a high-frequency signal. There is a responder on the moving part.
  • a magnetic field sensor is provided, which is disposed adjacent to a contact surface between the magnet and the yoke. This arrangement, which is adjacent to a contact surface, permits an exact detection of the locking force actually exerted by the magnet, because of the stray field which occurs most strongly there. Even a small air gap is detected due to scattering.
  • the magnetic field outside the magnetic circuit in the region between the magnetic core and the yoke is measured by means of a magnetic field sensor.
  • the measured magnetic field is small.
  • the magnetic core and yoke are separated from each other, the measured magnetic field becomes larger.
  • the disadvantage of this arrangement is that the magnetic field is also small if the magnetic coil is not energized.
  • a further disadvantage is that a magnetic field sensor separate from magnetic coil and core needs to be mounted separately.
  • the holding magnet is equipped with two permanent magnets, which are provided at their poles, each with a protruding back and forth soft iron plate. These soft iron plates are placed on the front in two places through a housing, and can attract a yoke-like soft iron rod, which is attached to a cabinet door.
  • the yoke-like soft iron rod connects only one pole of a permanent magnet with a pole of the other Permanent magnets.
  • the respective opposite poles of the two magnets are arranged with the door closed only near the yoke-like soft iron rod.
  • a reed switch extends from one of the two poles which can be joined together by the yoke-like soft iron rod to the other.
  • the yoke-like soft iron rod When the door is open, the yoke-like soft iron rod is outside the sphere of influence of the two permanent magnets. These two permanent magnets then able to operate the reed switch, so that a light in the cabinet is turned on. When the door is closed, however, the permanent magnets are no longer strong enough to operate the reed switch.
  • the reed switch is arranged to open when the soft iron bar is removed from the poles, and closes when the soft iron bar connects the poles.
  • Such embodiments may be used to switch lights, radios, music systems, alarm bells, or position sensors. Instead of permanent magnets and electromagnets can be used.
  • a magnetic proximity switch which consists of two juxtaposed and oppositely poled permanent magnets and a reed switch.
  • the reed switch extends in the longitudinal direction from one pole of one magnet to the other pole of the other magnet.
  • On the side opposite the reed switch side of the two permanent magnets these attract a door, a cover or the like of, for example, a copying machine. If the door is closed, the two adjacent poles of the permanent magnets are bridged with a kind of yoke. This creates on the side of the reed switch a stronger magnetic field between the local poles, so that the reed switch responds to the magnetic field. With the reed switch can therefore be detected whether the lid is held by the two magnets or not.
  • a disadvantage of these known, a holding force generating proximity sensors is that two magnets are required, and that they are small Holding forces have to do, so as not to operate the reed switch in the open state.
  • the monitoring should indicate whether the locking device is closed and turned on and the required holding force is reached or whether it is open.
  • An inventive locking device is equipped with an electromagnet and with an responsive to a magnetic field, electrical or electronic switching element for monitoring the magnetic field in the magnetic circuit.
  • the electromagnet comprises a core, a coil and a magnetic circuit of the electromagnet closing and removable from the core yoke.
  • the switching element engages the core or the yoke at two spaced apart in the longitudinal direction of the magnetic flux points. As a result, a value is detected, which corresponds to the drop in the electric flooding over the length of the tapped portion. This drop in electrical flux depends on the gap between the yoke and the core.
  • the switching element is preferably a reed switch, which is arranged in the longitudinal direction of the magnetic circuit in or on the core or in or on the yoke.
  • This design of the switching element has the advantage of the small dimensions of the switch and insensitivity to environmental influences.
  • the construction of the locking device can be correspondingly compact and simple.
  • the switching element is preferably a relay.
  • the drive of the relay comprises a magnetic circuit with U-shaped core and a magnetic circuit closing, movable armature, and has an actuated by the armature actuating comb.
  • the core of the relay is guided over a distance parallel to the core or yoke of the electromagnet and therefore accesses the magnetic flux at the end points of this path.
  • the switching element is a Hall sensor.
  • the switching element Because of the small size of the Hall sensor, it is necessary for the switching element to be disposed between two arms of magnetizable material connected to the core or yoke at spaced locations, or between an arm and a remote from the junction of that arm Place at the core. However, this arrangement is also possible in the other switching elements to obtain a greater magnetic resistance between the two taps on the magnetic core / yoke. The greater resistance results in a larger magnetic force in the switching element. Even the U-shaped core of the relay actually forms such an arm.
  • switching elements are expediently connected to an electronic system which monitors, controls or regulates the functions of the locking device and interprets the signals of the switching element.
  • a locking device 11 is shown with a plurality of switching elements. This plurality of different switching elements is shown by way of illustration. In economic embodiments, usually only one of these switching elements will be present, perhaps in duplicate.
  • the locking device 11 has an electromagnet 13 which has a coil 15 around a core 17 and a yoke 19.
  • the coil can be connected to a (not shown) power source to operate the electromagnet.
  • the core 17 of the electromagnet forms a "pot" with "center pole". With such magnets very high magnetic forces between the core 17 and the yoke 19 are achieved.
  • Zuhalte For a Zuhalte engaged Zuhalte member of about 50 to 200 kg are useful to reliably prevent the opening of a locked door.
  • a bore 21 is present, in which a reed switch is arranged. This reed switch is only activated by the coil when the yoke is closed and therefore a high electrical flux in the core is present.
  • the coil 15 In the electromagnetic locking device 11, the coil 15 generates an electric current ⁇ . Due to its magnetic properties, this electrical flooding ⁇ concentrates above all in the core 17 and the yoke 19. If the yoke 19 lies on the core 17 without an air gap s, the electrical flooding ⁇ is uniformly distributed in the magnetic circuit. Even with a small air gap s, the flux ⁇ in the iron becomes smaller, but it increases in the air gap. The sum of the electric flux ⁇ in the iron and in the air gap is constant and given by the electric current I, which is passed through the coil 15 and the winding number of the coil 15 (the electrical flux is therefore in AW, Amperewicklitch indicated).
  • Each part in the magnetic circuit has a magnetic resistance R1, R2, R3, R4, R5, R6, R7.
  • the magnetic resistance of the iron core and the yoke are smaller by some orders of magnitude than the magnetic resistance R6, R7 of the air in the air gap s.
  • the magnetic flux ⁇ in the core and in the air gap depends on the electrical flux ⁇ and the magnetic resistance R total of the magnetic circuit. With a large air gap s, the magnetic flux ⁇ is therefore small compared to the magnetic flux ⁇ with a small air gap. Since the electric flux ⁇ for the maintenance of the magnetic field in the region of the air gap s is "consumed" at a large air gap s, this results in a smaller electrical flux ⁇ in the region of the core.
  • the size of the electrical flux ⁇ of the iron core or the yoke is very much dependent on the air gap width.
  • the electric flux ⁇ in the iron is large, but small in the case of a large air gap.
  • the flooding ⁇ in the core can be picked up according to a voltage drop across one conductor per section.
  • the magnetic resistance R1, R2 .. over the tap length in relation to the total magnetic resistance R total of the part corresponds to the electric flux ⁇ of the section in relation to the total electrical flux ⁇ of the part.
  • Correspondingly large and small is also the drop in electrical flux ⁇ over the length of a sensor, or between the two taps of the sensor.
  • FIG. 3 shows the flux ⁇ in the iron over the length of the reed contact of 20 mm as a function of the air gap. If the reed contact has a sensitivity of 30 AW, the reed contact switches on if the air gap is less than approx. 0.02 mm.
  • Reed switches 23, Hall elements 25 and relays 27 are proposed as sensors (see FIG. 1). These can be arranged in the core 17, on the core, in the yoke 19 or on the yoke 19. The proximity to the magnetic circuit is necessary if it is not tapped by magnetizable arms. With arms of magnetizable material, however, the sensor can also be arranged at a distance from the magnetic circuit. He must then be between the ends of the arms.
  • a Hall element must therefore, as shown in FIG. 1, preferably tap off a larger portion of the core 17 via one or two arms 29 made of magnetizable material. Between the ends of the arms creates a magnetic field corresponding to the difference in the flow between the two taps 31,33.
  • the reed contact may be disposed in a hole 21 in the iron or on the surface of the iron of the core 17 or the yoke 19.
  • a magnetic, electrically non-conductive contact via ferrite between the core and the conductors of the reed contact is not required.
  • an electromechanical relay 27 (without coil) can be used.
  • a U-shaped core 37 which corresponds to the core of an electromagnetic drive of the relay
  • the core 17 of the electromagnet 13 is tapped.
  • the tapped portion of the electrical flooding of the core 17 causes a magnetic circuit in the core 37 of the relay 27.
  • This relay magnetic circuit is very weak when the air gap s at the electromagnet 13 is large.
  • the armature (39) falls under spring force from the core.
  • the relay magnetic circuit is strong enough to drive the relay when the air gap is small. Then the armature 39 is attracted against the spring force and the relay is switched.
  • the relay 27 may have a plurality of pairs of contacts 41. There may be closers and openers, which are actuated simultaneously by a common Betrelifactskamm 43.
  • the relay can be a positively driven safety relay.
  • the relay has the advantage over the reed contact that it can switch higher switching loads and can perform more switching movements than the reed contact. Furthermore, it has the advantage that it can have change-over contacts, make and break contacts as required in any combination, and is extremely flexible and reliable. Especially for safety applications, the relay is particularly suitable.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Electromagnets (AREA)
  • Measuring Magnetic Variables (AREA)
  • Lock And Its Accessories (AREA)
EP07405117A 2006-06-01 2007-04-12 Dispositif de maintien pouvant être surveillé Active EP1867820B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH8802006 2006-06-01

Publications (2)

Publication Number Publication Date
EP1867820A1 true EP1867820A1 (fr) 2007-12-19
EP1867820B1 EP1867820B1 (fr) 2009-06-03

Family

ID=38510478

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07405117A Active EP1867820B1 (fr) 2006-06-01 2007-04-12 Dispositif de maintien pouvant être surveillé

Country Status (7)

Country Link
US (1) US20070279163A1 (fr)
EP (1) EP1867820B1 (fr)
JP (1) JP5265138B2 (fr)
CN (1) CN101082254B (fr)
AT (1) ATE433035T1 (fr)
DE (1) DE502007000810D1 (fr)
ES (1) ES2326139T3 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1916365A2 (fr) * 2006-10-23 2008-04-30 ELESTA relays GmbH Dispositif de maintien en position fermée
DE102009059050A1 (de) * 2009-12-15 2011-06-16 Euchner Gmbh + Co. Kg Zuhaltesystem für einen Sicherheitsschalter und Sicherheitsschalter mit einem solchen Zuhaltesystem
EP2204521B1 (fr) * 2008-12-30 2016-04-20 Hanchett Entry Systems, Inc. Système de surveillance de verrouillage électromagnétique
DE102017130837A1 (de) * 2017-12-21 2019-06-27 Rosenberger Hochfrequenztechnik Gmbh & Co. Kg System, Messeinrichtung und Verfahren zur Erkennung eines Schließzustands

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011051946A1 (de) * 2011-07-19 2013-01-24 Dorma Gmbh + Co. Kg Türöffner mit Mitteln zur Erfassung der Position von beweglichen Bauteilen des Türöffners
US9447619B2 (en) * 2012-08-14 2016-09-20 Amazon Technologies, Inc. 90 degree magnetic latch to prevent high surface flux
DE102013225347A1 (de) * 2013-12-10 2015-06-11 BSH Hausgeräte GmbH Haushaltsgerät mit einer Verschlusseinrichtung
JP6248871B2 (ja) 2014-09-05 2017-12-20 株式会社デンソー 電磁アクチュエータ
JP7382916B2 (ja) 2020-10-14 2023-11-17 株式会社日立産機システム 真空遮断器

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2205603A (en) * 1987-06-10 1988-12-14 Richard Starr Bucks Improvements in catches
JPH07220594A (ja) * 1994-02-04 1995-08-18 Nippon Autom Kk 磁気近接スイッチ
WO2003012998A1 (fr) * 2001-07-27 2003-02-13 Pilz Gmbh & Co. Dispositif pour controler une position de fermeture de deux parties deplaçables l'une part rapport a l'autre, s'utilisant notamment comme contacteur de porte sans contact
DE20306708U1 (de) * 2003-04-29 2003-07-03 Schmersal K A Gmbh & Co Zugangsschutzeinrichtung
EP1426319A1 (fr) * 2001-07-31 2004-06-09 Mitsubishi Denki Kabushiki Kaisha Detecteur de position d'ascenseur
EP1510639A2 (fr) * 2003-08-27 2005-03-02 K.A. Schmersal Holding KG Dispositif de contrôle d'accès pour un domaine spatial

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2749454A (en) * 1953-08-28 1956-06-05 Gen Railway Signal Co Electromagnetic flashing relay
US3426166A (en) * 1966-06-09 1969-02-04 Int Standard Electric Corp Magnetic closure and switch for doors and similar devices
US4213110A (en) * 1978-07-20 1980-07-15 Holce Thomas J Proximity switch having adjustable sensitivity
JPS5549462U (fr) * 1978-09-27 1980-03-31
JPS5857237A (ja) * 1981-09-30 1983-04-05 富士通株式会社 リ−ドリレ−
JPS6066008U (ja) * 1983-10-14 1985-05-10 株式会社リコー ソレノイド
AT414183B (de) * 1994-06-08 2006-10-15 Tyco Electronics Austria Gmbh Bistabile schaltvorrichtung
US5699030A (en) * 1996-04-04 1997-12-16 The Narda Microwave Corporation Magnetically activated RF switch indicator
US6421009B2 (en) * 1998-05-08 2002-07-16 Peter Suprunov Mobile station position tracking system for public safety
ATE426911T1 (de) * 2000-04-03 2009-04-15 Elesta Relays Gmbh Relais
DE10216225A1 (de) * 2002-04-08 2003-10-30 Euchner Gmbh & Co Elektromagnetisches Zuhaltesystem eines Sicherheitsschalters

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2205603A (en) * 1987-06-10 1988-12-14 Richard Starr Bucks Improvements in catches
JPH07220594A (ja) * 1994-02-04 1995-08-18 Nippon Autom Kk 磁気近接スイッチ
WO2003012998A1 (fr) * 2001-07-27 2003-02-13 Pilz Gmbh & Co. Dispositif pour controler une position de fermeture de deux parties deplaçables l'une part rapport a l'autre, s'utilisant notamment comme contacteur de porte sans contact
EP1426319A1 (fr) * 2001-07-31 2004-06-09 Mitsubishi Denki Kabushiki Kaisha Detecteur de position d'ascenseur
DE20306708U1 (de) * 2003-04-29 2003-07-03 Schmersal K A Gmbh & Co Zugangsschutzeinrichtung
EP1510639A2 (fr) * 2003-08-27 2005-03-02 K.A. Schmersal Holding KG Dispositif de contrôle d'accès pour un domaine spatial

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1916365A2 (fr) * 2006-10-23 2008-04-30 ELESTA relays GmbH Dispositif de maintien en position fermée
EP1916365A3 (fr) * 2006-10-23 2008-08-13 ELESTA relays GmbH Dispositif de maintien en position fermée
EP2204521B1 (fr) * 2008-12-30 2016-04-20 Hanchett Entry Systems, Inc. Système de surveillance de verrouillage électromagnétique
DE102009059050A1 (de) * 2009-12-15 2011-06-16 Euchner Gmbh + Co. Kg Zuhaltesystem für einen Sicherheitsschalter und Sicherheitsschalter mit einem solchen Zuhaltesystem
DE102009059050B4 (de) * 2009-12-15 2017-10-12 Euchner Gmbh + Co. Kg Zuhaltesystem für einen Sicherheitsschalter und Sicherheitsschalter mit einem solchen Zuhaltesystem
DE102017130837A1 (de) * 2017-12-21 2019-06-27 Rosenberger Hochfrequenztechnik Gmbh & Co. Kg System, Messeinrichtung und Verfahren zur Erkennung eines Schließzustands

Also Published As

Publication number Publication date
EP1867820B1 (fr) 2009-06-03
US20070279163A1 (en) 2007-12-06
CN101082254B (zh) 2012-07-04
CN101082254A (zh) 2007-12-05
JP2007324124A (ja) 2007-12-13
ATE433035T1 (de) 2009-06-15
JP5265138B2 (ja) 2013-08-14
ES2326139T3 (es) 2009-10-01
DE502007000810D1 (de) 2009-07-16

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