EP0047221B1 - Niederspannungs-Schutzschalter mit einem Sperrhebel - Google Patents

Niederspannungs-Schutzschalter mit einem Sperrhebel Download PDF

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Publication number
EP0047221B1
EP0047221B1 EP81730071A EP81730071A EP0047221B1 EP 0047221 B1 EP0047221 B1 EP 0047221B1 EP 81730071 A EP81730071 A EP 81730071A EP 81730071 A EP81730071 A EP 81730071A EP 0047221 B1 EP0047221 B1 EP 0047221B1
Authority
EP
European Patent Office
Prior art keywords
lever
locking lever
low
toggle
locking
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
EP81730071A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0047221A2 (de
EP0047221A3 (en
Inventor
Werner Troebel
Martin Böttcher
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Priority to AT81730071T priority Critical patent/ATE10688T1/de
Publication of EP0047221A2 publication Critical patent/EP0047221A2/de
Publication of EP0047221A3 publication Critical patent/EP0047221A3/de
Application granted granted Critical
Publication of EP0047221B1 publication Critical patent/EP0047221B1/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
    • H01H71/501—Means for breaking welded contacts; Indicating contact welding or other malfunction of the circuit breaker
    • 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
    • H01H71/522—Manual reset mechanisms which may be also used for manual release actuated by lever comprising a cradle-mechanism
    • H01H71/525—Manual reset mechanisms which may be also used for manual release actuated by lever comprising a cradle-mechanism comprising a toggle between cradle and contact arm and mechanism spring acting between handle and toggle knee

Definitions

  • the invention relates to a low-voltage circuit breaker with a drive lever which can be moved by an actuating handle and which acts on a selector shaft provided with movable contact pieces by means of a drive spring and two toggle levers connected by a knee joint, and with a locking lever seated on the selector shaft to prevent the actuating handle from being transferred into the switch-off position with movable contact blocks blocked in the switch-on position.
  • a circuit breaker of this type is known from DE-A-2508220.
  • the locking lever is firmly connected to the selector shaft and interacts with a swivel-mounted stop in such a way that the drive lever and thus the operating handle sitting on it are locked against being transferred to the switch-off position when the movable switch pieces in the switch-on position e.g. are blocked by welding with the associated fixed contact pieces. If, on the other hand, there is a normal shutdown, the associated rotation of the selector shaft and a corresponding pivoting of the locking lever raise the stop and release the drive lever. In both cases, the latching of the switching mechanism is first released by a trigger member connected to the drive lever.
  • Another known device for locking the drive lever in the case of blocked contact pieces has a two-armed, on the knee joint of the toggle lever locking lever, one arm engages in the windings of a drive spring of the toggle lever and the other lever arm cooperates with the hinge pin, which one of the toggle lever with Carrier of the movable contact piece connects.
  • the invention has for its object to achieve a safe limitation of the travel of the drive lever with blocked switching pieces and the transmission of a high breaking force with a simple structure using a locking lever seated on the shift shaft.
  • this object is achieved in a low-voltage circuit breaker of the type mentioned at the outset in that the locking lever is pivotably mounted on the control shaft relative to the latter, and the knee joint of the toggle lever and a working surface of the drive lever with one only partial movement of the drive lever in the direction the game corresponding to the switch-off position overlaps.
  • the forces occurring during the attempt to switch off with blocked switching pieces are absorbed by the locking lever itself, which is supported on the switching shaft.
  • a design of the locking lever is particularly favorable in such a way that it acts on the knee joint with a force acting both in the opening direction of the knee joint and in the direction of the abutment of the toggle lever facing away from the movable switching element.
  • This design of the locking lever which can be achieved by the curved shape of the surface of one fork arm cooperating with the knee joint, allows high breaking forces which are not limited by a pretension of the switching mechanism by the drive spring.
  • the mentioned points of attack of the locking lever on the switching mechanism are usually not in one plane.
  • the locking lever can obtain a shape suitable for interacting with these points of attack in that it has an angled or bent fork arm at its end for bearing against the working surface of the drive lever and an equally designed further fork arm for bearing against the knee joint bolt forming the knee joint.
  • the length of the fork arms depends not only on the length required to obtain the bends or offsets mentioned, but also whether a space must be maintained for the movement of any other components of the switching mechanism or for optional accessories for the circuit breaker.
  • the play between the fork arms of the locking lever and the counter surfaces of the drive lever and the knee joint can be selected to be relatively large in the switched-on state compared to the state of the contact contact. This ensures an unhindered switch-on and prevents damage to the knee-joint-side drainage surface of the locking lever.
  • the switching shafts of the circuit breakers are usually designed with a polygonal profile, in particular square, and consist of a metal core and a covering made of insulating material.
  • the locking lever can be mounted on a multi-edged control shaft of this type by means of a bearing body which has a cylindrical outer surface.
  • the locking lever can be supported against tilting and / or lateral displacement. It is thereby achieved that the fork arms of the locking lever are always aligned with the counter surfaces of the knee joint and the drive lever and so that the necessary interaction is ensured.
  • a single locking lever can be used, even if the drive lever is paired, i.e. is designed as a double lever.
  • the forces that occur are even more manageable if, in conjunction with the paired drive levers, two mirror-image locking levers are provided, each with its own mounting and support.
  • the locking lever is even cheaper to design the locking lever as a double lever with two mirror-image legs and a web connecting them. This eliminates the risk of canting and the bearing of the locking lever on the selector shaft is less expensive.
  • FIG. 1 shows a low-voltage circuit breaker of the compact type in a longitudinal section in the region of the central pole which has the drive mechanism.
  • a selector shaft is shown as an assembly with attached carriers of movable contact pieces and a locking lever in two different views.
  • FIG. 6 shows a side view of a further locking lever with differently shaped fork arms.
  • the low-voltage circuit breaker 1 shown in section in FIG. 1 belongs to the design of the so-called compact switch. Accordingly, it has a housing 2 made of insulating material, which is divided along a joint 3 into a lower part 4 and an upper part 5. An actuation handle 6 protrudes from an opening of the upper part 5 and is used to switch the low-voltage circuit breaker 1 on and off by hand. A drive lever 7, which is pivotable about a fixed abutment 10, is used to transmit the movement. A main pawl 12 is pivotable about a further fixed bearing 11, which is supported in the switched-on state shown with a nose 13 on a locking tab 14.
  • the locking tab 14 can be released by a trigger shaft 15, which in turn can be rotated by a thermal and / or a magnetic trigger.
  • a trigger shaft and other parts of a trigger contains e.g. DE-C-2812320.
  • a toggle lever system is supported on the main pawl 12, the toggle levers 16 and 17 of which are connected to one another by a knee joint pin 20 and to a contact carrier 22 by a further hinge pin 21. This is attached to a control shaft 23 which is rotatably mounted in the lower part 4 of the housing 2.
  • the movable contact piece 24 is opposite a fixed contact piece 26, which is also provided with a contact pad 27.
  • the current path of the low-voltage circuit breaker 1 comprises, in addition to the switching elements mentioned, a connecting device 30 connected to the fixed switching element 26 and a further connecting device 31 on the opposite end face of the housing 2, which connects to the movable switching element 24 by means of a flexible conductor 32 and one by the trigger leading heating conductor 33 is connected.
  • the toggle levers 16 and 17 assume their extended position under the action of a drive spring 34 which is suspended between the upper end of the drive lever 7 and the knee joint pin 20. If the actuating handle 6 is moved in the direction of the arrow 35, the toggle levers bend when the main pawl 12 is in the unchanged position, as a result of which the contact carrier 22 with the switching shaft 23 is pivoted counterclockwise and the movable contact piece 24 is thereby lifted off the fixed contact piece 26. A resulting switching arc is extinguished in the quenching chamber 37 provided with quenching plates 36.
  • the low-voltage circuit breaker 1 is provided with a device which prevents the actuating handle 6 from being moved into the switch-off position in the direction of arrow 35 despite the blocking of the movable contact piece, and from being able to be locked there.
  • An essential component of this protective device is a locking lever 40 which is arranged on the selector shaft 23 and is pivotably mounted relative to the latter.
  • a fork arm 41 of the locking lever 40 interacts with a working surface 42 of the drive lever 7, while another fork arm 43 interacts with the knee joint pin 20 of the toggle levers 16 and 17.
  • the locking lever 40 engages over the knee joint of the knee lever 16 and 17 and the drive lever 7 with a certain amount of play, which is shown in FIG. 1 between the knee joint pin 20 and the fork arm 43. If the attempt is made to switch off the low-voltage circuit breaker 1 when the movable switching element 24 is blocked, the blocking lever 40 with its fork arm 41 is first carried along over the working surface 42 of the drive lever 7 until the other fork arm 43 lies against the knee joint bolt 20. With a certain amount of force on the operating handle 6, the toggle levers 16 and 17 bend in the switch-off direction. A further movement of the drive lever 7 is not possible. Therefore, the operating handle 6 can not be moved to its normal switch-off position, but only about half way.
  • the design of the fork arm 43 of the locking lever 40 ensures that all operational movements within the low-voltage circuit breaker 1 are not hindered or that annoying wear and tear occurs.
  • the surface of the fork arm 43 opposite the knee joint pin 20 is shaped for this purpose so that when switched on, in the state of contact contact, there is still minimal play between the knee joint and the working surface of the drive lever on the one hand and the fork arms 41 and 43 on the other hand.
  • the forces occurring during the attempt to switch off with blocked contact pieces are essentially absorbed by the locking lever 40 itself, so that its bearing on the switching shaft 23 is subjected to pressure.
  • This can therefore be formed by a suitable plastic bearing body which has an opening adapted to the profile of the selector shaft on the inside and a cylindrical bearing surface for the locking lever 40 on the outside.
  • This bearing body can also limit the axial play.
  • the shape of the locking lever 40 means that not only a force for opening the toggle lever system, but also a force for separating welded contact pieces can be applied, which is not limited by the pretensioning forces present in the switching mechanism.
  • the fork arm 43 of the locking lever 40 engages with its surface 48 on the knee joint pin 20 with two components of the force that act differently. One component acts in the direction of the knee levers 16 and 17 buckling and thereby unlocks the movable switching element.
  • the other component acts in the direction of the abutment (pin 18) of the toggle lever 16 on the main pawl 12.
  • a breaking force can be exerted on the movable switching element 24 which is caused by the kinking of the toggle levers 16 and 17 .
  • This breaking force is based on the bolt 18 on the main pawl 12, which in turn rests on the locking tab 14.
  • the selector shaft 50 consists of a metal core and an encapsulation made of an insulating plastic. On this shaft with a square profile, three contact piece carriers 51 are fastened side by side, which have a U-shaped part 52 and arms 53 extending from the legs.
  • the control shaft 50 extends through the legs of the U-shaped part 52.
  • a bracket 54 encompassing the control shaft is riveted to the U-shaped part 52 and establishes a rigid connection between the control shaft 50 and the contact piece carrier 51.
  • each of the legs 57 and 60 of the locking lever 56 is provided with an opening which is mounted on a further bearing body 61 seated on the selector shaft 50.
  • the bearing bodies 55 which are required anyway can also be used, provided that they are provided with a corresponding extension in the direction of the legs 57 and 60.
  • FIGS. 4 and 5 Further details of the locking lever 56 can be seen in FIGS. 4 and 5, in which the locking lever is shown enlarged compared to FIGS. 2 and 3.
  • the locking lever 56 is designed as a cast part, so that the two legs 57 and 60 form a coherent component with a connecting web 62.
  • the legs 57 and 60 are mirror images and each have two fork arms 63 and 64. These have a high degree of rigidity against spreading due to the forces in the form of the permissible hand force to handle, as can occur when trying to switch off with blocked contact pieces.
  • a reinforcing rib 65 is provided on each of the two legs, which together with the outer wall of the legs form a U-shaped profile.
  • a curved region 66 is provided near the end of the fork arm 63 which is connected to the knee joint, i.e. usually cooperates with the knee joint bolt of the switching mechanism.
  • the curve shape of this area is selected such that there is minimal play when switching on at the point of contact and in the fully switched-on state there is a slightly larger play according to FIG. 1.
  • the opposite fork arm 64 has at its end a curved surface 67 for abutting the drive lever 7 in Fig. 1.
  • An angled or cranked shape of the fork arms 63 and 64 ensures that the ends of the fork arms are in the correct position with respect to the counter surfaces of the Switch mechanism received.
  • the surfaces 67 are provided on the sides of the legs facing away from one another, while the curved regions 66 are arranged on the sides of the legs facing one another (FIGS. 3 and 4).
  • the legs of the double or paired drive lever 7 are parallel to the legs 57 and 60 of the locking lever 56 on the outside thereof.
  • the cranking or angling of the fork arms 64 to the outside is not required if the drive lever 7 (FIG. 1) has a corresponding bulge, a shoulder or the like.
  • the bearing body 61 has the shape of a bush, which is adapted to the square profile of the selector shaft 50 on the inside and, like the bearing body 55, is displaceable on the selector shaft. Outside, the bearing bodies 61 have a cylindrical bearing surface for the inner opening 68 of the locking lever 56. A collar 69 for limiting the axial displaceability of the locking lever 56 can be part of the bearing body 61 or - as FIGS. 4 and 5 show - part of the locking lever 56.
  • a locking lever 70 also designed as a cast part, is shown in FIG. 6.
  • the only difference from the locking lever 56 is the shape of the fork arms 71 and 72, which is adapted to the different shape and movement of the switching mechanism of another circuit breaker.
  • the locking lever 70 is also formed as a double lever with mirror-image legs and a connecting web 73.
  • locking levers 56 and 70 as castings, e.g. As die cast parts, locking levers with the same function can also be produced from sheet metal by punching and bending. Instead of double levers, single levers or two individual levers can also be used, which can be produced in any suitable manner. Lateral displacement and / or tilting can be prevented by the bearing body or additional separate parts. With the double levers described there is no risk of canting, so that it is only necessary to limit the lateral displacement.

Landscapes

  • Breakers (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
EP81730071A 1980-08-29 1981-08-06 Niederspannungs-Schutzschalter mit einem Sperrhebel Expired EP0047221B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81730071T ATE10688T1 (de) 1980-08-29 1981-08-06 Niederspannungs-schutzschalter mit einem sperrhebel.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3033213A DE3033213C2 (de) 1980-08-29 1980-08-29 Niederspannungs-Schutzschalter mit einem Sperrhebel
DE3033213 1980-08-29

Publications (3)

Publication Number Publication Date
EP0047221A2 EP0047221A2 (de) 1982-03-10
EP0047221A3 EP0047221A3 (en) 1982-10-06
EP0047221B1 true EP0047221B1 (de) 1984-12-05

Family

ID=6111065

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81730071A Expired EP0047221B1 (de) 1980-08-29 1981-08-06 Niederspannungs-Schutzschalter mit einem Sperrhebel

Country Status (5)

Country Link
US (1) US4392036A (enrdf_load_stackoverflow)
EP (1) EP0047221B1 (enrdf_load_stackoverflow)
JP (1) JPS5774932A (enrdf_load_stackoverflow)
AT (1) ATE10688T1 (enrdf_load_stackoverflow)
DE (1) DE3033213C2 (enrdf_load_stackoverflow)

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FR2262859B1 (enrdf_load_stackoverflow) * 1974-03-01 1977-09-23 Merlin Gerin
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DE8023509U1 (de) * 1980-08-29 1980-11-27 Siemens Ag, 1000 Berlin Und 8000 Muenchen Niederspannungs-Schutzschalter für Sperrhebel

Also Published As

Publication number Publication date
ATE10688T1 (de) 1984-12-15
DE3033213A1 (de) 1982-03-11
EP0047221A2 (de) 1982-03-10
DE3033213C2 (de) 1982-10-21
JPS6253898B2 (enrdf_load_stackoverflow) 1987-11-12
EP0047221A3 (en) 1982-10-06
US4392036A (en) 1983-07-05
JPS5774932A (en) 1982-05-11

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