EP0871969A1 - Dispositif dans un disjoncteur de protection - Google Patents

Dispositif dans un disjoncteur de protection

Info

Publication number
EP0871969A1
EP0871969A1 EP96940207A EP96940207A EP0871969A1 EP 0871969 A1 EP0871969 A1 EP 0871969A1 EP 96940207 A EP96940207 A EP 96940207A EP 96940207 A EP96940207 A EP 96940207A EP 0871969 A1 EP0871969 A1 EP 0871969A1
Authority
EP
European Patent Office
Prior art keywords
contact arm
latch
safety switch
spring
pivot pin
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.)
Withdrawn
Application number
EP96940207A
Other languages
German (de)
English (en)
Inventor
Patrik Söderlund
Lennart Sjöstedt
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.)
Enpece Sigma AB
Original Assignee
Enpece Sigma AB
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 Enpece Sigma AB filed Critical Enpece Sigma AB
Publication of EP0871969A1 publication Critical patent/EP0871969A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H01H71/10—Operating or release mechanisms
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/505—Latching devices between operating and release mechanism
    • 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
    • H01H71/10—Operating or release mechanisms
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/52—Manual reset mechanisms which may be also used for manual release actuated by lever
    • H01H71/526—Manual reset mechanisms which may be also used for manual release actuated by lever the lever forming a toggle linkage with a second lever, the free end of which is directly and releasably engageable with a contact structure

Definitions

  • the present invention relates to safety switches and more specifically to a device in a safety switch accord ⁇ ing to the preamble to claim 1.
  • Safety switches are used as short-circuit and over ⁇ load protection for single-phase or multiphase machinery, plants etc. and are frequently arranged in groups. Background of the Invention
  • the inventive device in a safety switch consists of those parts that cooperate through a safety switch for maintaining and rapidly opening a connected (live) electric circuit when too much current flows in the cir ⁇ cuit which indicates some sort of short-circuit, over ⁇ load or leakage current.
  • the device usually comprises a movable contact arm which, when the safety contact is first switched on, comes into engagement with a fixed contact and closes the electric circuit through the safety switch, and a locking and release mechanism com ⁇ prising a plurality of links and springs, which serves to lock the contact arm in a triggered, or switched-on, position and which is actuated to release the mechanism for opening the electric circuit.
  • the object of the present invention is to provide a device in a safety switch, which has few components, has a small mass and permits automated mounting.
  • the main purpose of the spring integrated in the latch is to bias the latch and the contact arm in rela ⁇ tion to one another in various positions taken by the contact arm.
  • This single and integrated spring eliminates a plurality of loose springs in conventional structures.
  • This solution according to the invention reduces the weight and complexity of the device to a considerable extent, rationalises production and permits automated mounting of the device in a safety switch.
  • Figs 1-4 show a safety switch using the device according to the invention, the Figures illustrating various states of function.
  • Fig. 5 shows a preferred embodiment of the inven ⁇ tive device.
  • Fig. 6 shows from below a latch included in the device in Fig. 4.
  • Fig. 7 is a side view of the latch in Fig. 6.
  • Fig. 8 is a top plan view of the latch in Fig. 6.
  • Fig. 9 shows a contact arm included in the device in Fig. 4.
  • Fig. 10 shows a contact arm spring included in the device in Fig. 4.
  • Fig. 11 shows an alternative embodiment of the latch included in the inventive device. Description of the Preferred Embodiment
  • Fig. 1 shows a safety switch comprising a preferred embodiment of a device 1 according to the invention, said device having a movable contact arm 2 and a latch 3.
  • an electric circuit is made from, among other things, an incoming pole 4 ( illu- strated highly schematically), a bimetallic strip 5, a copper braid 6, the movable contact arm 2, a fixed con ⁇ tact 7, a solenoid 9 and an outgoing pole 10 (illustrat ⁇ ed highly schematically).
  • the safety switch further com ⁇ prises an operating handle 11 for manual switching on/ switching off of the safety switch.
  • the operating handle 11 is, via a handle link 12, connected to the device 1.
  • the device 1 also comprises a contact arm spring 13, which is biased between the housing 14 of the safe ⁇ ty switch and contact arm 2.
  • a clamp 15 connects the latch 3 to the bimetallic strip 5.
  • the safety switch has two stable positions, switch- ed-on and switched-off. The positions are shown in Figs 1 and 3, respectively. From the switched-off position, the safety switch is switched on by moving the operating handle 11 in the direction of arrow A. This procedure will be described in more detail below. From the switch- ed-on position, the safety switch can be released, i.e. switched off, automatically in two ways. If a short-cir ⁇ cuit arises in the circuit in which the safety switch constitutes a link, a very great current arises imme ⁇ diately. This rapid and great change affects the sole- noid 9, such that its anchor is moved and displaces a forcing lever 17 (see Fig.
  • the second way arises as a slower procedure, in which a current which is above a permissible value arises in the electric circuit without affecting the solenoid.
  • the too high current causes the bimetallic strip 5 to be hot and bend, thereby actuating the latch 3 via the clamp 15.
  • the device 1 represents a unique new approach, which will be obvious from the following specification.
  • the contact arm 2 and the latch 3 are rotatably arranged on a pivot pin 18, which in turn is mounted in the housing 14.
  • One end 19 of the handle link 12 communicates with one end 20 of the contact arm 2 and one end 21 of the latch 3.
  • Fig. 5 one end 19 of the handle link 12 is located, as is best seen in Fig. 5 in which the device 1 is shown in a view from the oppo ⁇ site side compared with the one shown in Figs 1-4, in a space which is defined by a first 22 and a second 23 engaging surface of the latch 3 and an engaging sur ⁇ face 24 of the contact arm 2.
  • the device 1 comprises a spring which forces one end 20 of the contact arm 2 and one end 21 of the latch 3 towards one another.
  • the spring is integrated in the latch 3, i.e. it consti- tutes a spring portion 30 formed in one piece with the latch 3.
  • latch spring 30 forms a tongue, whose first free end 31 is provided with a protrusion 33 which rests in a seat 34 formed in the contact arm 2.
  • the other end 35, the base end or fixing end, of the latch spring 30 is positioned at one end 21 of the latch 3.
  • the contact arm 2 and the latch 3 are first joined in a simple operation in which the free end 31 of the latch spring 30 is placed in its seat 34 and the latch spring 30 is slightly biased by the latch 3 and the contact arm 2 being forced together and fixed by means of the pivot pin 18, which is moved into pivot pin seats which here consist of pivot pin holes 36a and 36b in the contact arm 2 and the latch 3, respectively.
  • the pivot pin hole 36a in the contact arm 2 is elongate, see Figs 9 and 4. The reason for this will be explained below.
  • this unit or package is mounted in the housing 14, a portion projecting from the package, in this case a portion of the pivot pin 18, being accommo ⁇ dated in a recess in the housing 14.
  • the interconnection of the contact arm 2 and the latch 3 can be automated, but can also be carried out very quickly by hand.
  • the package can advantageously be finally mounted, together with the remaining components of the safety switch, in the housing 14 in an automated operation.
  • the latch 3 also comprises a clamp seat 40 for the clamp 15.
  • the latch spring 30 is L-shaped, but has a curved transition portion 37 instead of the straight angle of the L.
  • the pivot pin 18 is located essentially between the two ends 31, 35 of the latch spring 30. This means that the first and second ends 31, 35 of the latch spring 30 are so arranged that a clockwise turning moment arises when the contact arm 2 and the latch 3 are moved together, since the latch spring 30 is then forced essentially in the direction of arrow B by the contact arm 2 and is bent, mainly in the long leg 38. The turning moment forces the ends 20 and 21 towards one another.
  • the latch spring 30 can be designed in various ways.
  • the two ends of the spring portion can be positioned on the same side of the pivot pin 18, i.e. between the pivot pin 18 and one and the same end of the latch 3, as seen in the longitudinal direction of the latch 3, instead of being positioned on either side of the pivot pin, as in the embodiment described above.
  • a further conceivable embodiment of the latch spring as shown in Fig. 11 has the spring fixed in both ends.
  • This alternatively designed latch spring 60 comprises a clamp-shaped portion 61 and a protruding portion 62, resting in the seat of the contact arm, between the ends 63, 64.
  • the latch spring 30 has a further function which is principally its main function.
  • the latch 3 When the device 1 is released from the switched-on position, the latch 3 is caused to rotate in the direction of arrow C, see Fig. 5.
  • the contact arm spring 13, like at this stage also the latch spring 30, strives to rotate with the contact arm 2 in the same direction, but owing to the handle link 12 retaining the contact arm 2, this cannot rotate.
  • the end 21 of the latch 3 therefore is urged away from the end 20 of the contact arm.
  • the inclination of the engaging surface 24 causes the end of the link 12 to be driven towards the pivot pin 18 and then the contact arm 2 can begin to rotate.
  • the contact arm spring 13 drives the mechanism 1 to the switched-off position illustrated in Fig. 2.
  • the operating handle 11 comprises a handle spring 25 which is tensioned during the manual switching-on of the switch.
  • the handle spring thus acts as a return spring that returns the operating handle 11 to the starting position when the device 1 has been released. This results in the handle link 12 being moved back to the ends 20, 21 of the arm 2 and the latch 3. At this moment, the other function of the latch spring 30 will also come into the picture.
  • the latch spring 30 keeps the ends 20, 21 together, thereby preventing the handle link 12 from leaving the space between the latch 3 and the contact arm 2.
  • the handle spring 25 is sufficiently strong to pull the handle link 12 into the space defined by the engaging surfaces 22-24, which results in a transition from the switched-off posi ⁇ tion shown in Fig. 2 to the switched-off position shown in Fig. 3, where the operating handle 11 has returned to its starting position.
  • the unique construction according to the invention having essentially two main components only, i.e. the contact arm 2 and the latch 3 and a spring 30 acting therebetween and constituting a portion of the latch 3, provides possibilities of designing the contact arm 2 in a completely new fashion.
  • the contact arm 2 moves very rapidly from the contact 7 to a stop lug 26.
  • the contact arm 2 hits the stop lug 26 forcefully, which subjects the contact arm 2 to great stresses.
  • the con ⁇ tact arm 2 is designed so as to withstand high moments about the pivot pin 18. The stresses occurring on the contact arm 2 perpendicularly to the direction of motion thereof, however, are insignificant.
  • the contact arm 2 is flat, i.e. has a main extent in one plane, viz. in a plane perpendicular to the pivot pin, which in this case is the plane in which the contact arm 2 moves between the contact 7 and the stop lug 26.
  • the flexural rigidity of the contact arm 2 is thus optimised and concentrated to the plane in which the great stresses arise.
  • the most important advantage of the flat contact arm 2 is its greatly reduced weight in relation to the contact arms of the prior-art devices. A great advantage in terms of pro ⁇ duction is also achieved since the contact arm 2 can be made directly with a punch from a metal sheet.
  • the flat shape of the contact arm 2 also simplifies the connection thereof with the latch 3.
  • a slit 39 which is centrally positioned in the latch 3.
  • the contact arm spring 13 which is shown on its own in Fig. 10, is fixed between the contact arm 2 and the housing 14. It has essentially three engag ⁇ ing portions, two at the ends 50, 51 of the contact arm spring 13 and one in the U-shaped central portion 52 of the spring 13.
  • Each of the ends 50, 51 consists of a bent portion of the contact arm spring 13 and extends substan ⁇ tially perpendicularly to the plane of extension of the contact arm 2.
  • the central portion 52 of the contact arm spring 13 rests in a seat 53 in the contact arm 2.
  • the seat 53 is positioned between one end 20 of the contact arm 2 and the pivot pin hole 36a thereof.
  • the ends 50, 51 of the contact arm spring rest in a seat 54 in the hous ⁇ ing 14.
  • the contact arm spring 13 has two functions. When the mechanism is released, it causes the contact arm 2 to rotate about the pivot pin 18 such that its contact end moves from the contact 7 to the stop lug 26.
  • the contact arm spring 13 is tensioned when the operating handle 11 is turned for switching on the safety switch.
  • the contact arm spring 13 pivoting, during the initial stage of the releasing procedure, mainly about the ends 50, 51 and opening but to a small degree, it causes merely a very small fric ⁇ tional resistance which does not brake the movement of the contact arm 2 from the contact 7 to the stop lug 26 to any considerable extent. Also the mounting of the con ⁇ tact arm spring 13 thus contributes to the rapidity of the device.
  • the latch 3 and the contact arm 2 have been designed such that their masses are positioned as close as possible to the centre of rotation, i.e. the pivot pin 18. As a result, the moments of inertia are minimised.
  • the latch 3 is made of plastic and is designed so as to be in ection-mouldable. The dimensions of the contact arm 2 and the latch 3 are minimised, as has also appeared from that stated above.
  • the contact end of the contact arm 2 can be extended in the plane perpendicular to the main extent of the contact arm 2.
  • the aim is to increase the engaging surface of the contact arm 2 with the contact 7.
  • Many different mate ⁇ rials are possible for the contact arm as well as the latch 3.
  • the latch spring 30 can, of course, be designed in various ways and have various points of attachment, of which some examples have been stated above, and its con ⁇ nection with the contact arm 2 can be designed in diffe ⁇ rent ways.
  • the device can be used in safety switches of diffe- rent kinds, such as safety switches having a different design of operating handle, short-circuit protection (solenoid) or thermal protection (bimetallic strip) or other parts for actuating the latch, compared with the forcing lever 17 and the clamp 15.
  • the safety switch may also serve as short-circuit protection only.

Landscapes

  • Tumbler Switches (AREA)
  • Switch Cases, Indication, And Locking (AREA)

Abstract

L'invention concerne un dispositif dans un disjoncteur de protection. Le dispositif (1) comprend un bras de contact (2) et un verrou (3) coopérant avec le bras. Ledit verrou comporte une partie ressort monobloc (30). L'invention concerne également un disjoncteur de protection utilisant ledit dispositif. Le disjoncteur de protection comprend une poignée d'actionnement (11) permettant de commuter manuellement le disjoncteur de protection, le dispositif (1) mentionné ci-dessus permettant de fermer et d'ouvrir un circuit électrique par le biais du disjoncteur de protection, une liaison (12) de poignée reliant la poignée au dispositif de façon à transmettre à ce dernier un mouvement venant de la poignée, et un boîtier contenant les différents composants disposés dans le disjoncteur de protection.
EP96940207A 1995-11-20 1996-11-20 Dispositif dans un disjoncteur de protection Withdrawn EP0871969A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9504133 1995-11-20
SE9504133A SE509949C2 (sv) 1995-11-20 1995-11-20 Anordning vid säkerhetsbrytare samt säkerhetsbrytare innefattande en sådan anordning
PCT/SE1996/001507 WO1997019459A1 (fr) 1995-11-20 1996-11-20 Dispositif dans un disjoncteur de protection

Publications (1)

Publication Number Publication Date
EP0871969A1 true EP0871969A1 (fr) 1998-10-21

Family

ID=20400289

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96940207A Withdrawn EP0871969A1 (fr) 1995-11-20 1996-11-20 Dispositif dans un disjoncteur de protection

Country Status (4)

Country Link
EP (1) EP0871969A1 (fr)
PL (1) PL326698A1 (fr)
SE (1) SE509949C2 (fr)
WO (1) WO1997019459A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20011572A1 (it) * 2001-07-23 2003-01-23 Abb Service Srl Interruttore automatico a bassa tensione a ridotto numero di componenti
ITMI20011574A1 (it) * 2001-07-23 2003-01-23 Abb Service Srl Meccanismo cinematico per un dispositivo di protezione e/o interruzione di corrente a bassa tensione
DE102005041231B4 (de) * 2005-08-31 2009-11-26 Abb Ag Elektrisches Schaltgerät
CN103337426B (zh) * 2013-05-31 2015-12-09 浙江天正电气股份有限公司 一种带快速闭合装置的小型断路器
US20230109720A1 (en) * 2020-03-31 2023-04-13 Inventio Ag Safety monitoring device, and method for monitoring the safety of an elevator system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH681752A5 (fr) * 1991-02-22 1993-05-14 Weber Ag
WO1995020235A1 (fr) * 1994-01-21 1995-07-27 Square D Company Ensemble a lame

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9719459A1 *

Also Published As

Publication number Publication date
PL326698A1 (en) 1998-10-26
SE9504133D0 (sv) 1995-11-20
SE509949C2 (sv) 1999-03-29
SE9504133L (sv) 1997-05-21
WO1997019459A1 (fr) 1997-05-29

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