EP0127784B1 - Überstromschutzschalter - Google Patents

Überstromschutzschalter Download PDF

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Publication number
EP0127784B1
EP0127784B1 EP84105015A EP84105015A EP0127784B1 EP 0127784 B1 EP0127784 B1 EP 0127784B1 EP 84105015 A EP84105015 A EP 84105015A EP 84105015 A EP84105015 A EP 84105015A EP 0127784 B1 EP0127784 B1 EP 0127784B1
Authority
EP
European Patent Office
Prior art keywords
contact
contact bridge
lever
pivoting
overload protective
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
Application number
EP84105015A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0127784A1 (de
Inventor
Harald Dipl.-Ing. Heil
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.)
Lindner Fabrik Elektrischer Lampen und Apparate GmbH
Original Assignee
Lindner Fabrik Elektrischer Lampen und Apparate GmbH
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 Lindner Fabrik Elektrischer Lampen und Apparate GmbH filed Critical Lindner Fabrik Elektrischer Lampen und Apparate GmbH
Priority to AT84105015T priority Critical patent/ATE21186T1/de
Publication of EP0127784A1 publication Critical patent/EP0127784A1/de
Application granted granted Critical
Publication of EP0127784B1 publication Critical patent/EP0127784B1/de
Expired legal-status Critical Current

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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
    • H01H71/52—Manual reset mechanisms which may be also used for manual release actuated by lever
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2300/00—Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H
    • H01H2300/046—Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H using snap closing mechanisms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/10—Adaptation for built-in fuses
    • H01H9/104—Adaptation for built-in fuses with interlocking mechanism between switch and fuse
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate

Definitions

  • the invention relates to an overcurrent protection switch with the features of the preamble of claim 1.
  • an elongated contact bridge is pivotably arranged in the switch level, which can be controlled manually by means of a handle, namely a rocker arm, and cooperates with a fixed contact to close the current path.
  • a handle namely a rocker arm
  • the contact bridge is acted upon by a spring which acts on the rocker arm in such a way that its spring preload is increased when the rocker arm is in the switched-on position.
  • the end of the contact bridge remote from the contact is latched by a ratchet lever which interacts with a release device, namely a magnetic release, the contact bridge is supported approximately in the middle in the manner of a two-armed lever on a rotary bearing which is arranged on a contact bridge holder.
  • the pawl lever If, in the event of a short circuit, the pawl lever is actuated by the triggering device, it releases the end of the contact bridge remote from the contact, so that it can suddenly swivel away from the fixed contact under the tension of the spring. In the event of a restart (by moving the rocker arm first to the off position and then turning it back to the on position), the contact end of the contact bridge is slowly moved against the fixed contact, which disadvantageously results in creeping contact. The contact pressure is exerted by the resiliently remote end of the contact bridge, which makes the contact bridge relatively complex overall.
  • the invention has for its object to simplify the design of an overcurrent protection switch, while maintaining the sudden, spring-assisted switch-off, a torque switch is possible and in particular the number of necessary spring elements should be reduced.
  • the contact bridge pivot As the essence of the invention, it is considered, in the case of manual switching on and off, to make the contact bridge pivot as a one-armed lever around the non-contact end, which is supported by the latch lever, the only spring acting on the contact bridge acting in the contact direction and in In the event of an emergency release, the effect of the same contact spring can be used to break the contact, which is done by the fact that in the event of an emergency release the contact bridge support, d. H. the fulcrum of the contact bridge, in the middle of which is laid. It is therefore essential to the invention that the only contact spring acts between the two possible pivot points, namely that at the end remote from the contact for manual switching on and off and the central pivot bearing on the contact bridge.
  • the contact spring is effective in contact-opening or contact-closing while maintaining its pulling direction. In connection with the articulation beyond dead center with subsequent freewheeling into one or the other position by the spring action, an abrupt contact closure (moment engagement) of the contact is achieved.
  • Claims 2, 3 and 4 relate to different types of design of the central pivot bearing, namely
  • lateral guide grooves are arranged in the central region of the contact bridge, as a result of which in particular the end remote from the contact can pivot smoothly and uninhibitedly into the switch-off position in the event of an emergency release.
  • the housing-fixed stop effective for arc quenching forms a counterbearing when the switching lock is tensioned solely by pressure exerted by the pressure ram in accordance with the characterizing feature of claim 8.
  • the locking stop according to claim 14 serves to ensure a momentary release in the event of an overcurrent.
  • the ratchet lever can therefore not according to the deflection of the bimetal by the spring acting on it in the contact opening direction be deflected. Rather, the locking stop ensures that the latch lever is unlocked abruptly only after the desired deflection of the bimetal has been reached in the event of an overcurrent. This is achieved in a particularly space-saving manner according to the characterizing feature of claim 15.
  • the pressure tappet and the control link articulated with it form a toggle lever, the dead center position of which is the extended position of the toggle lever.
  • the rocker arm only has the function of moving this toggle lever over its extended position against the pressure of the contact spring. Then the control arm is swiveled into its respective swivel end position automatically and independently of the swivel speed of the rocker arm only under the pressure of the contact spring.
  • claims 7 to 22 relate to switch designs with a contact bridge holder
  • claims 23 ff Describe advantageous developments of switch lock designs in which the contact bridge is held and guided directly in the housing by groove guides.
  • the overcurrent protection switch contains in the switch housing 1 the contact spring 2, the contact bridge 4 interacting with the fixed contact 3, the contact bridge holder 5, the latch lever 6, the strip-shaped bimetal 7 and the rocker arm 8 rotatably mounted on the switch housing 1.
  • the passage of current through the switch between the two connection terminals 9, 10 takes place via the bimetal 7, the connecting cable 12, the contact rail 11, the connecting cable 12a, the contact bridge 4 and the fixed contact 3, which in turn via the fuse 26 with its two connecting contacts 27, 28 and the rail 25 with the connecting terminal 10 is in an electrically conductive connection.
  • the contact bridge 4 is designed as a two-armed lever. As a result, it has the contact arm 13 close to the contact and the holding arm 14 remote from the contact.
  • the contact bridge bearing is marked with 15.
  • the non-contact holding arm 14 of the contact bridge 4 is acted upon by the contact spring 2 in the contact opening direction.
  • the contact spring 2 is a tension spring whose distal end 16 is fastened to the switch housing 1 in the vicinity of the rocker arm 8. Through the contact spring 2, the contact bridge 4 is pulled with the end of its holding arm 14 against a swivel limiting stop 17 which is rotatably mounted on the latch lever 6 about an axis perpendicular to the longitudinal plane of the switch.
  • the pawl lever 6 is mounted on the switch housing 1 in the area of its bearing end 18 in the switch plane about the axis 19.
  • the axis 19 lies between the contact bridge 4 and the rocker arm 8.
  • the pivoting end 20 of the latch lever 6 can be deflected by the bimetal 7 from its normal position shown in FIGS. 1, 2 and 4 ff.
  • the pawl lever 6 Into the pivoted position shown in FIG. 3.
  • the pawl lever 6 also contains a fixed stop protruding into the path of the further contact opening in the contact opening direction 21 of the holding arm 14 of the contact bridge 4 22.
  • the contact bridge holder 5 is pivotally mounted on the switch housing 1 with its end facing away from the contact bridge bearing 15 and is acted upon by a pressure plunger 23 which is effective against the pulling direction of the contact spring 2 and can be transferred from the rocker arm 8 via a dead center with a subsequent automatic movement sequence.
  • the axis 19 of the pawl lever 6 is arranged at its end facing the rocker arm 8.
  • the bearing axis 29 of the contact bridge holder 5 lies between the axis 19 and the pivot end 20 of the latch lever 6.
  • the pivot limiting stop 17 is only effective in the contact opening direction 21 against the holding arm 14 of the contact bridge 4 and thereby limits its pivoting path in the contact opening direction 21.
  • the end 31 of the contact arm 13 of the contact bridge 4 bears against the stop 32 which is fixed to the housing and which is in particular in contact with the extinguishing chamber designated as a whole by 33.
  • the pivoting end 20 of the pawl lever 6 is acted upon in the unlocking direction 34 by the unlocking spring 35 against the locking stop 36, which in turn can be pivoted about an axis running perpendicular to the central longitudinal direction of the switch housing 1 by the deflection of the bimetal 7 from its operative position.
  • the locking stop 36 is under the pressure of a return spring (not shown) which is effective in the direction of the arrow 37 in the direction of the bimetallic pivoting.
  • the bimetal 7 runs approximately parallel to the ratchet lever 6 next to this. Its deflecting end 38, which lies approximately next to the pivoting end 20 of the ratchet lever 6, acts upon the arm 39 of the angle lever 40 pivotably mounted on the switch housing 1 in the switch plane, the other arm 41 of which acts on the locking stop 36 in the unlocking direction opposite to the direction of the arrow 37 of its spring action, whereby the locking stop on reaching its unlocking position (FIG. 3) releases the pivoting of the latch lever 6 taking place under the pressure of the unlocking spring 35 in the unlocking direction 34. In its unlocked position, the pivoting end 20 of the latch lever 6 overlaps the V-shaped, sector-shaped recess 42 of the locking stop 36 and plunges into this recess 42.
  • the plunger 23 is articulated between two pivot end positions (FIGS. 1, 4 on the one hand and FIG. 6 on the other hand) in the switch plane at the end 43 of a control arm pivotally mounted on the switch housing 1.
  • the two pivot end positions are on either side of a dead center position closest to the contact bridge holder 5.
  • the control arm is designed as a disk 45 rotatably mounted about the axis 44, which rotatably supports the pressure plunger 23 with its rocker arm-side end 46 on its periphery (end 43).
  • the rocker arm 8 is pivotally mounted about the axis 44.
  • the control arm formed by the disc 45 can be moved over its bottom dead center position by actuating the rocker arm 8, after which it automatically swivels under the pressure of the contact spring 2 into its respective pivot end position (FIGS. 1, 4 on the one hand and FIG. 6 on the other hand).
  • the bearing sleeve 47 of the rocker arm 8 surrounding the disc 45 is provided in the region of the articulation of the control arm (disc 45) with a cutout 58, the length of which points in the circumferential direction approximately the pivoting path of the control arm bearing (end 46 of the pressure tappet 23) between its dead center position and its pivoting end positions corresponds.
  • the pressure plunger 23 runs approximately parallel to the ratchet lever 6 and rests with its free end 48 on the upper edge 49 of the contact bridge holder 5.
  • the free end 48 of the pressure ram 23 is rounded off as a rolling track. It lies in the space between the bearing end 18 of the latch lever 6 and the housing wall 50 flanking the fuse 26 with lateral mobility.
  • the contact bridge support 5 contains two cheeks 51 running parallel to one another in the switch plane, which are firmly connected to one another and between which the contact bridge 4 is arranged.
  • the latch lever 6 is also arranged between the cheeks 51.
  • the bearing axis of the contact bridge 4 is formed by pins 52 formed on both sides of the contact bridge 4 and which lie in bearing eyes 53 inserted into the cheeks 51.
  • the contact bridge 4 is formed by a metal stamped part.
  • the pins 52 are made from laterally protruding from the contact bridge 4, with the contact bridge 4 integral tabs.
  • the bearing eyes 53 each have a convex side wall 54 on the contact spring side as a counter bearing for the pivoting movement of the contact bridge 4.
  • the pawl lever 6 is a sheet metal part bent in a U-shaped cross section, between the U-webs of which the holding arm 14 of the contact bridge 4 projects.
  • the pivot limiting stop 17 is designed as a shaft rotatably mounted in the cheeks 61 of the ratchet lever 6, the cross-section of which is approximately semicircular in the stop region lying between the U-legs.
  • the holding arm 14 of the contact bridge 4 rests with its end on the lower circumferential region 56 of the semicircular cross section of the pivoting limit stop 17 that is adjacent to the semicircular diameter 55 and which is caused by its rotation by rotating the shaft or pivoting away the pawl lever 6 the holding arm 14 can be brought out.
  • the bimetal 7 or the locking stop 36 can also be deflected in a known manner by means of a magnetic release device designated overall by 57.
  • the deflecting end 38 of the bimetal 7 is pivoted counterclockwise by its heating or by the magnetic release device 57 around its upper clamping end.
  • the deflecting end 38 strikes against the arm 39 of the angle lever 40 and pivots the angle lever 40 clockwise about its axis.
  • the other arm 41 of the angle lever 40 rotates the locking stop 36 counterclockwise.
  • the recess 42 comes into overlap with the pivoting end 20 of the ratchet lever 6.
  • the unlocking spring 35 presses the pivoting end 20 of the ratchet lever 6 into the recess 42, whereby the ratchet lever 6 pivots counterclockwise about its axis 19.
  • the rocker arm 8 was not actuated during the above-described movements within the switch.
  • the switch assumes the limit switch position shown in FIG. 4.
  • the rocker arm 8 In order to be able to restart, the rocker arm 8 must first be pivoted clockwise about the axis 44.
  • the bearing sleeve 47 of the rocker arm 8 presses the end 46 of the pressure ram 23 in front of it with its front edge 59 which delimits the cutout 58.
  • the disk 45 is rotated with the same movement. This means that the toggle lever formed by the disk 45 and the pressure tappet 23 is pushed into its extended position. With this transfer of the toggle lever formed into its extended position, the pressure ram 23 presses with its free end 48 the upper edge 49 of the contact bridge holder 5 downward. This pivots counterclockwise about its bearing axis 29 and moves the contact bridge bearing 15 downward.
  • the end of the holding arm 14 of the contact spring sweeps past the semicircular diameter 55 of the swivel limiting stop 17. As soon as the holding arm 14 has passed the swivel limit stop 17, it becomes under the restoring force emanating from the restoring spring 30. pivoted back clockwise into its initial position shown in the figures. If the toggle lever formed by the disk 45 and the pressure tappet 23 passes through its extended or dead center position by pivoting the rocker arm 8 further, the tension of the contact spring 2 has reached its maximum. As soon as the aforementioned stretching or dead center position has been exceeded, the pressure exerted by the contact spring 2 becomes fully effective in the sense of the knee joint of the toggle lever formed by the disk 45 and the pressure plunger 23 being bent again.
  • the disc 45 pivots clockwise through the free space of the cutout 58 of the bearing sleeve 47 of the rocker arm 8 until the plunger 23 laterally abuts the housing wall 50 and thus puts an end to the pivoting of the disc 45.
  • the pressure tappet 23 then assumes the position shown in FIG. 6, irrespective of whether the rocker arm 8 is already in its swung-out end position shown in FIG. 6 or is held in the intermediate position in which it is held by the disk 45 and the pressure tappet 23 formed toggle lever has been pushed through its extension or dead center position.
  • the contact spring 2 consequently relaxes and pulls the holding arm 14 of the contact spring 4 against the pivot limiting stop 17, which has been pivoted into the pivoting path of the holding arm 14 by its return spring 30, with the result that the further pivoting of the contact bridge 4 relative to the contact bridge holder 5 is blocked is. Due to the stop of the holding arm 14 on the swivel limit stop 17, further relaxation of the contact spring 2 is no longer possible.
  • the switch is in the switch-on position (FIG. 6).
  • the swivel limiting stop 17 cannot become effective with respect to the holding arm 14 of the contact bridge 4 because it lies outside of its swivel path. Consequently, if the rocker arm 8 is pivoted again counterclockwise in the switch-on direction, the contact spring 2, after passing through the toggle lever controlled by it, tears the holding arm 14 of the contact bridge 4 upward due to its dead center or extended position. However, this does not find a stop at the swivel limit stop 17, but is immediately pulled against the fixed stop 22 of the pawl lever 6, which only swivels the pawl lever 6 back under compression of the unlocking spring 35 (FIG. 4), but without the contact bridge 4 in it Einschaltstelluhg is transferred.
  • a contact bridge 104 is arranged in a switch housing 101 so that it can pivot about a contact bridge bearing 115 and is acted upon in the contact closing direction by the contact spring 102.
  • the contact end lies against the fixed contact 103, the end remote from the contact (holding arm 114) is held in the region of the contact bridge bearing 115 by the latching lever 106.
  • the central rotary bearing 170 is formed by a housing projection 172 lying on the contact side 171 of the contact bridge 104, a small distance 173 being present between the housing projection 172 and the contact side 171 in the switched-on position.
  • the contact bridge bearing 115 consists of housing grooves 174 which run approximately parallel to the contact closing direction and in which side projections 175 of the end remote from the contact slidably lie.
  • the pawl lever 106 is provided with an elongated hole guide 176 which engages around the side projections 175 in the manner of a backdrop.
  • the central longitudinal direction 177 of the elongated hole guide 176 extends at an angle to the central longitudinal direction 178 of the housing grooves 174, so that in the event of a manual force P H acting on the contact bridge 104 (cf. Pawl lever 106 in the direction of arrow 179 and subsequent latching takes place.
  • the ratchet lever By pulling the contact spring 102, in the case of unlatching (FIG. 11), the ratchet lever is pivoted against the direction of arrow 179.
  • the contact bridge 104 rotates in the manner of a two-armed lever around the housing projection 172, the contact path being torn open by the pull of the contact spring 102.
  • the contact bridge 104 acts exclusively as a one-armed lever which rotates about its contact bridge bearing 115.
  • Fig. 13 illustrates that the latch lever 106 has a U-shaped cross-section and with its U-legs 180 engages around the non-contact end of the contact bridge 104 such that the side projections 175 pass through the elongated hole guides 176 and engage in the housing grooves 174.
  • FIG. 14 represents a “mixed solution” of the two previously described exemplary embodiments. This is because use is made of the groove guide of the second exemplary embodiment according to FIGS. 9 to 13, the housing grooves 274 arranged in the switch housing 201 with associated side projections 275 in the middle region of the contact bridge 204 are relocated, but the contact lever latching with the latch lever 206 is used at the end remote from the contact (holding arm 214), as is shown in the first exemplary embodiment according to FIGS. 1 to 8.

Landscapes

  • Breakers (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Electronic Switches (AREA)
EP84105015A 1983-05-06 1984-05-04 Überstromschutzschalter Expired EP0127784B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84105015T ATE21186T1 (de) 1983-05-06 1984-05-04 Ueberstromschutzschalter.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3316574 1983-05-06
DE3316574 1983-05-06

Publications (2)

Publication Number Publication Date
EP0127784A1 EP0127784A1 (de) 1984-12-12
EP0127784B1 true EP0127784B1 (de) 1986-07-30

Family

ID=6198317

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84105015A Expired EP0127784B1 (de) 1983-05-06 1984-05-04 Überstromschutzschalter

Country Status (4)

Country Link
EP (1) EP0127784B1 (no)
AT (1) ATE21186T1 (no)
DE (1) DE3460392D1 (no)
GR (1) GR82081B (no)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3410340A1 (de) * 1984-03-21 1985-10-03 Heinrich Kopp Gmbh & Co Kg, 8756 Kahl Zaehlervorautomat
DE8611082U1 (de) * 1986-04-23 1986-07-17 Lindner Gmbh, Fabrik Elektrischer Lampen Und Apparate, 8600 Bamberg Handbetätigter elektrischer Schalter
NL8703170A (nl) * 1987-12-31 1989-07-17 Holec Syst & Componenten Elektromagnetische schakelaar.
NL8703172A (nl) * 1987-12-31 1989-07-17 Holec Syst & Componenten Schakelaar, in het bijzonder voor gebruik als schakelautomaat.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2688675A (en) * 1953-07-20 1954-09-07 Gen Electric Electric circuit breaker
DE2242128A1 (de) * 1972-08-26 1974-03-07 Geyer Fa Christian Mechanismus fuer selbstschalter

Also Published As

Publication number Publication date
ATE21186T1 (de) 1986-08-15
DE3460392D1 (en) 1986-09-04
GR82081B (no) 1984-12-13
EP0127784A1 (de) 1984-12-12

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