DE2344940A1 - Cct. breaker with electromagnetic, thermal and manual trip - has switching lever with compression spring abutting moving contact - Google Patents

Abstract

The line protective circuit breaker has a switching lever whose one end abuts a latching element, releasable by the electromagnetic and/or thermal trip, ewhile its other side is guided in a stationary recess by a manual actuator. This end actuates a spring-loade moving contact to coact with the fixed contact. Between the switching lever and the moving contact is arranged a compression spring, over which the moving contact is actuated. In the make position no tripping forces are transmitted to the moving contacts via the compression spring. A two-shank spring may form the compression spring secured to the moving contact by one shank, while the other one is under such tension as to bring the tripping spring against the moving contact.

Description

Mp no. 873/73

j, SEP. 1973

Leadership treasure trove

The invention relates to a circuit breaker with electromagnetic, thermal unc ⁵ manual release to a shift lever, the einesendk abuts a detachable from the electromagnetic and / or thermal release Verklinkungsglied and urn other end in a stationary recess with hooves of a manual actuator to Verklinkungspunkt is pivotally guided and acts on a movable contact piece, which is acted upon by an opening spring, and interacts with a stationary contact piece.

In a known circuit breaker of this type, the latching element is movably mounted, with its ^ .ager is supported by a suspension generating the contact pressure (DT-PS 712 051). To the on the movable contact piece To be able to overcome the triggering forces of the opening spring, the contact pressure spring must be relatively steep Have characteristic curve, whereby the transmitted over the latch. Contact pressure force fully effective in the latching point becomes, and thus the release members acting on the latching member, a relatively high friction component in the latching point have to overcome. In addition, if the contact pieces wear out as a result of contact erosion, a Change in thermal tripping and lead to an extension of the tripping time.

5098U / 0434

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23A49A0

Mp no. 873/73 5, StP. 1973

In another known version of a circuit breaker, the switching lever is represented by a leaf spring (DT-PS 1 538 331). In this device, too, the characteristic curve of the contact pressure spring represented by the shift lever is extremely steep in order to be able to rinden a ^{great force of the switch-off fee 1 required for triggering the switch.} An overstroke necessary to compensate for material losses in the event of contact erosion can therefore only be small in this case. In addition, the tolerances occurring during production in the various components have an additional negative effect on the force relationship between the switch-off force and the contact pressure force.

The object of the invention is, while maintaining a relatively simple structure of the switching mechanism by using few and simple individual parts with low mass weight, an improvement in terms of the balance of power to achieve by opening and contact pressure spring. The switch should be small in size. In particular, should its overall height remains below 68 mm to keep it in "low" To be able to accommodate flush-mounted distributors.

In accordance with the invention, this is achieved in that between the Switching lever and the movable contact piece, a contact compression spring is arranged that the opening spring indirectly via the contact pressure spring on the movable contact piece acts and that in the switched-on position by the attack of the switching lever on the contact pressure spring no release forces of d ^ r The opening spring acts on the movable contact piece and the tripping forces are fully effective after unlatching. ·

50981 Λ / 0 A 3 4
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BATH ORIGINAL

Mp no. 873/73 - 3 -

This makes it possible to use a contact compression spring To use a flat characteristic curve and, on the other hand, to provide an opening spring which has a high force component.

According to further training, a leg spring is provided as a contact compression spring, which is fixed to the movable contact piece with its one leg and with its other leg is applied under tension in such a way that the ar. ^{The opening spring 1} acting on the free end of this leg acts on the movable contact piece, while in the switched-on position the switch lever attacking this leg removes it from contact with the movable contact piece.

According to a further embodiment, the contact pressure spring is as Formed leaf spring and is her on the movable contact piece fixed leg locked on a pin or cam of the movable contact piece, while the other Leg rests with its end behind lugs of the movable contact piece and the opening spring acting on it in a slot of an angled rests.

Furthermore, the movable contact piece is designed as a stationary pivot lever, whose with the stationary Contact piece cooperating lever arm is several times, preferably three times, longer than that with the switching lever cooperating lever arm.

A preferred feature of the invention is that the shift lever is coupled to the movable Kentaktstück in such a way is that in the unlocked state, the free movement of the shift lever is unaffected by the contact pressure spring.

,. BATH ORIGINAL

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S098U / CH3 / *

Mp no. 873/73 F. SEP. 1973

Finally, the movable contact piece, designed as a pivot lever, is provided on its long sides with parallel angles, each of which has a bore for the stationary pivot bearing, an elongated hole for the _{grip of} a lever coupled to the switching lever and between which the contact pressure spring is arranged which rests with lateral shoulders on the noses formed on the angled portions.

The circuit breaker according to the invention is shown in the drawing using an exemplary embodiment. E ₃ shows

gig. 1 is a view of the circuit breaker in the switched off Condition with the arrangement of the individual components within the switch housing,

Fig. 2 is a view according to Pig. I when switched on,

Fig. 3 is a sectional view according to section line III-III and

4 shows a partial representation along section line IV-IV.

In the switch housing 1 are the individual. Components of the circuit breaker housed. The switching mechanism consists of a manually operable toggle lever 2, which can be pivoted about a stationary pivot point and actuates a movable switching lever 4 via an articulated lever 3. One end of this shift lever 4 is placed against a nose 6 of a latching element 5 and its other end is pivotably guided around the latching point 6 in a stationary recess 7. The latching member 5, which can be pivoted about a stationary pivot point and is designed as a double lever, is under the influence of a thermal release 13 and an electromagnetic release 14 which acts on the latching member 5 by means of a hinged armature 15. _c

-D-

5098U / 0A3A

- 5 Mp no. 873/73 SEP 5. 1973

As a thermal release 13 is a connection contact 12 attached bimetallic strip is provided, which is parallel to the electromagnetic release 14 with this and an arc chamber 16 provided with quenching plates is arranged next to one another in the lower part of the switch housing 1.

The shift lever 4 acts via a further articulated lever 3J8 a movable pivotable about a stationary fulcrum 10 Contact piece 9 for interaction with a stationary contact piece 11 a. A contact compression spring 17 is arranged between the switching lever 4 and the movable contact piece 9. In In the example shown, the contact compression spring 17 is designed as a leaf spring. The movable contact piece 9 is as stationarily mounted pivot lever formed, its lever arm cooperating with the stationary contact piece 11 to is several times, preferably three times, longer than its lever arm cooperating with the switching lever 4.

The movable contact piece 9 is on their long sides with parallel angled portions 24 each having a bore 25 for the stationary pivot bearing 10 and an elongated hole 26 for the attack of the further coupled to the shift lever 4 Have articulated lever 8, between these parallel angles 24, the contact compression spring 17 designed as a leg spring is arranged. One leg is the contact compression spring 17 on a pin or cam l8 of the movable KontaktStücks 9 locked, while the other leg with its end behind lugs I9 of the movable contact piece 9 is present. The free end of the last-mentioned leg of the contact compression spring I7 has an angled portion 20 in which a Slit 21 is provided for the storage of a spring leg 23 of an opening spring that engages the contact pressure spring I7 22nd

- 6 509 814/0434

Mp no. 873/73 5th StP. 1973

In the - ^ in switching process, the movable before contact piece 9 pivoted about the stationary pivot point 10 by means of the further articulated lever 8 by the pivoting movement of the switching lever 4. The further articulated lever 8 moves in the elongated hole 26 and tensions the contact compression spring I7. Simultaneously the opening spring 22 mounted on the contact pressure spring I7 with its leg 23 is tensioned. Is in the on position by the engagement of the latched switching lever 4 via the further articulated lever 8 on the contact pressure spring I7 any effect of the triggering forces of the opening spring 22 on the movable contact piece 9 is canceled. The plant of the Contact compression spring I7 with its lateral lugs 27 to the Lugs I9 of the movable contact piece 9 is in the switched-on position canceled. This ensures a sufficient overstroke to compensate for material losses in the event of contact erosion. Thanks to the favorable lever ratio of 1: 3, the contact pressure spring I7 of the lugs 19 achieve a relatively large overstroke at the contact point, e.g. a minimal lift of 0.4 mm already causes an overstroke of 1.2 mm. This is the switch-off process the delay time caused by the overstroke is greatly reduced. When the rear derailleur is unlatched due to a thermal or electromagnetic tripping is immediate the contact pressure spring 17 relaxes and the switch-off spring pivots the movable "contact piece 9 after overcoming the minimal lift between the contact compression spring 17 and the. Noses 19 - "ash in the switch-off position. By training the The elongated hole 26 in the movable contact piece 9 is the pressure of the further articulated lever acting on the contact compression spring 17 8 during the triggering process by acting on the lifting of the switching lever 4 from the movable contact piece 9 Forces, e.g. the leg spring pulling the rocker arm 2 and the entire switching mechanism into the disengaged position 2 8

.- ■ quickly

lifted and the further articulated lever 8 held at a distance from the 'Kontaktdruckfrder I7, as this is due to their movement

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- 7 Mp no. 873/73 * SEP. 1973;

the system behind the noses 19 is limited. It can thus no unnecessary frictional forces cause a delay in the contact opening during the switch-off process.

The switch housing 1 is closed on its opening side by a cover plate 29, whereby the in the housing 1
inserted components of the rear derailleur and the like. Are locked.

The invention is not limited to that in the example
solution shown. Thus, instead of a contact compression spring I7 made from spring steel strip, one made from spring steel wire can easily be provided.

509814/0434

Claims (6)

Mp no. 873/75 5; SEP. 1973 claims: 1.) Circuit breaker with electromagnetic, thermal and manual triggering with a s _{cna it} lever, which at one end rests against a latching element that can be released from the electromagnetic and / or thermal trigger and at the other end is pivotably guided around the latching point with the aid of a manual operating element and which acts on a movable contact piece acted upon by an opening spring to interact with a stationary contact piece, characterized in that a contact compression spring (17) is arranged between the switching lever ( ² I-) and the movable contact piece (9), that the opening spring (22) acts indirectly via the contact pressure spring on the movable contact piece and that in ELnschaltlage no triggering forces from the opening spring act on the movable contact piece due to the action of the switching lever on the contact compression spring and the triggering forces are fully effective after unlatching. 2.) Circuit breaker according to claim 1, characterized in that a leg spring is provided as a contact compression spring (17) which is fixed to the movable contact piece (9) with its one leg and with its other leg is applied under tension in such a way that the The opening spring (22) engaging the free end of this leg acts on the movable contact piece, while in the switched-on position the switching lever (4) engaging on this leg removes its contact with the movable contact piece. 509814/0434 2 3 44 9 4 Oa Mp no. 873/73 1. '$ EP. 1973 3.) Circuit breaker according to claim 1 or 2, characterized in that the contact compression spring (17) as a leaf spring is formed and that her on the movable contact piece (9) fixed leg on a pin or cam (18) of the movable contact piece is locked, while the other leg is locked with its end behind Lugs (19) of the movable contact piece rests and the opening spring (22) engaging it in a slot (21) is angled. 4.) Line protection switch according to one or more of the claims 1 to 3j, characterized in that the movable contact piece (9) is a stationary pivot lever is formed, the lever arm of which cooperates with the stationary contact piece (11) by a multiple, is preferably three times longer than the lever arm cooperating with the switching lever (4). 5.) line protection switch according to one or more of claims 1 to 4, characterized in that the switching lever (4) with the movable Kentaktstück (9) like this is coupled that in the unlocked state the free movement of the shift lever by the contact pressure spring (17) is unaffected. 6.) Circuit breaker according to one or more of claims 1 to 5i, characterized in that C? S designed as a pivot lever movable contact piece (9) is provided on its long sides with parallel angled portions (24) each having a bore (25) for the stationary Schw'nklagerung (10), each have an elongated hole (26) for the engagement of a lever (8) coupled to the switching lever (4) and between which the contact pressure spring (17) is arranged, which is connected to the the angled lugs (19) rests. 509814/0434 ORlGSMAL BATHROOM