DE2005742A1 - Movable contact carrier for electrical switches - Google Patents

Description

Street-

Bassani S «p.a.

Corso Porta Yittoria 9, Milan / Italy

Movable contact carrier for electrical switches

It is known to work in electrical switches, especially In automatic switches, there is a major drawback due to the destruction of the electrical contacts. This is due to the electrical sparks that develop between the contacts during opening and closing Close the same form. This destruction exercises one Influences the conductivity of the contact surfaces and causes harmful overheating «

The more damage to the contacts, the greater the damage is the current under which the circuits are operated and increases when opened under overload and especially in the event of a short circuit.

In switches with a high operating current, it is common to use a pair of fixed and movable contacts for each phase, ^{i.e. at least one pair of so-called main contacts and usually a pair of so-called arc contacts 11} or "spark breakers". The main contacts have the task of transmitting the largest percentage of the current when the switch is closed and of ensuring good conduction, while the spark breaker contacts have the function of absorbing the harmful effects of the sparks during opening and closing.

003342/1069

, ϊ « ¹ * ^ - e-vsfV ¹ *» "** ^ Sί" ϊ, i - * Γ. ϊ Al

Consequently, these are controlled in such a way that they are based on the Open main contacts completely and close completely in front of them

However, this ^A onstruktion has so far not been able to be transferred to the low-power switch because of the space required and the costs.

The invention overcomes this deficiency. It creates movable contact carriers for the main contacts and spark breaker contacts§.

which are particularly suitable for use with small switches because of the small amount of space they take up. You prevent that sparks spread to the main contact and damage it because of the small distance created by the Given a reduced construction, the invention provides characteristic means for overcoming this disadvantage.

The inventive movable contact carrier of the main contact and radio breaker for electrical switches, with a contact carrier as a radio breaker captures the effect of the harmful effects of sparking, by closing the own] ι contact before the main contact totally and completely opens it after opening the main contact is gekennzeichz ei t by at least one main contact holder and a radio breaker contact carrier, said main contact holder of the latter is umsciLossen and unabhähgig vo ι this can oscillate without ·

The spark breaker contact carrier and the main contact carrier have contacts aligned with the axis of the control arm on which two contact carriers are mounted.

Furthermore, there are radio breaker contact carriers and main contact carriers independently swingable mounted on the control arm

Preferably the main contact carrier and the spark breaker are üiKJi? · two independently arranged sokvingbar on the same pin of the control The main contact support and the Funkenbrechtrkontaktträger are provided with separate pressure springs, which different

009842/1069

Pressure on the / moving contacts and on the fixed ones Make contacts, with the spark breaker contact itself opens before the main contact and closes after the main contact.

Usually, the spark breaker contact consists of two Legs that enclose the main contact carrier and Form a wing at the front, under which a spark breaker contact is attached, and verbundin at the back by a web on which a spring acted

Usually the main contact carrier consists of a rod large diameter formed

The axis of oscillation of the two contact carriers preferably falls together. , The contact carriers are usually supported by one arm of the moving parts of the apparatus, as he did such devices are common

The object of the invention is for example but not restrictively explained in the drawings, which represent:

1 shows a side view, partly in section, of an overall group of contact carriers on a fairly enlarged scale; Fig. 2 shows a top view for · '$ · λ

In these figures, 1 denotes a fixed contact carrier, consisting of a copper plate connected to an input terminal of the device · A spark breaker contact 2 and a main contact 3 are mounted on this plate? the spark breaker contact 2 is arranged on a 'higher level than the main contact 3.

The movable rope comprises an arm 4, which in the Open position and closed position by a shaft 5 can be brought out by any trigger mechanism manually and / or automatically, an electrical switch is operated «

009842/1069

This arm 4 ends at the front with two lugs 6, which are arranged at a suitable distance from one another and with coaxial Bores are provided in which a pin 7 is seated.

In the space between the two lugs 6, a first contact carrier 8 is mounted on the pin 7, consisting of two parallel, spaced-apart legs 9 and 10, which are in the front in the positions 9 ' and 10 'have turned back to the front, meet there and form a single wing 11, under which the contact 12 is arranged as a movable spark breaker contact. At the back are the two legs 9 and 10 are united by a web 13 which forms a gap 14 having.

In this gap 14 is a pin 15, which also goes through a bore 16 which is provided in the upper part of the arm 4 and goes beyond this, so that one of the springs 17 between an upper head 18 and the upper part of the arm 4 is compressed, pulls the web 13 upwards, so that the other end of the contact carrier 8 and in particular the spark breaker contact 12 is pressed downwards _e

The main contact carrier 19 is arranged between the two legs 9 and 10 and also swinging around the pin 7 provided, consisting of a rod with a large diameter, the top with a recess or a seat

20 and is dimensioned so that it is tightly spaced from the legs 9,10,9 'and 10' of the contact carrier 8 can be included. At the rear, the contact carrier 19 has a shoulder

21, on which a preferably white flexible conductor 21 'is connected

At the bottom and immediately behind the spark breaker contact 12, the main contact carrier 19 carries the main contact 22, so that the contact 12 and the contact 22 are aligned with the axis of the arm 4.

009842 / 106g
COPY

Instead of a single contact carrier 19 and a single contact 2fi 22, two contact carriers lying next to one another can be provided; these are also always arranged between the legs 9 and 10 of the spark breaker contact,

The contact carrier 19 is pressed down by a spring 23, which is arranged in the seat 20 and on the Contact 22 exerts a higher contact pressure than spring 17. Between the web 13 and approach 21 is a conductive one Connection 24 arranged in the form of a flexible stranded wire to ensure a good electrical connection between the contact carriers 8 and 19 to produce and to hold the approach 21 in the rest position in a position in which the contact located behind contact 12

In this way it is certain that when the current is closed, the contact 12 completely touches the contact 2, or. has left completely when the current is opened before the contact 22 completely touches or completely leaves the contact 3 Has·

Under these circumstances, even when opening under a short circuit, an extension of the arc along the Legs 9 and 10 form, which, however, does not act on the contact 22, which is thus among all occurring Conditions is protected

The end. For this reason and because the contacts 12 and -22 are lined up along the axis of the arm 4, the contact carriers θ and 19 can be made in very small dimensions, so that they can be used in particular on switches with low current, although they do their protective objects for the Maintain the main contact and its conductivity in full

By lifting out the pin 7, the contact carriers can be dismantled and replaced if necessary.

f rs c- '^ ^fe- ? - C- f.

L- x ~ C? - i c ϊ -ζ- t - '· .- COPY

BATH ORIGINAL

The invention can also be implemented in other ways without stepping out of your B&B

Kf

ΑΪ ^w - -ü: '

Claims (7)

PATENT CLAIMS Movable contact carrier for main contact and spark cup for electrical switches, with one contact carrier as a spark breaker, the effects of harmful consequences the spark formation by fully scaling one contact before the main contact and scaling it after the Opening of the main contact opens completely, g e k e η η · ζ e in e t by at least one main contact carrier / and one Spark breaker contact carrier (8), the main contact carrier (19) being enclosed by the latter (S), and can vibrate independently of this 2. Contact carrier according to claim 1, characterized in that the spark generator contact carrier (8) and the main contact carrier (19) have contacts (12, 22) aligned with the axis of the control arm (4) which both contact carriers are mounted. 3. Contact carrier according to claims 1 and 2, characterized marked that Funkenkontaktkxliür (8) and main contact carrier (19) independently of one another are swingably mounted on the control arm (4). 4. Contact carrier according to the preceding claims, characterized in that the main contact carrier (19 ^ and the spark breaker contact carrier (8) both independently of one another echwingbar aui the same pin (7) of the Control arm (4) are arranged 5 · Contact carrier according to one of the preceding claims, characterized in that the main contact carrier (19) and the spark breaker contact carrier (8) with separate compression springs are provided, which a different NEN pressure on the movable contacts (12, 22) and on the Exercise fixed contacts (2, 3), whereby the spark breaker contact opens before the main contact and after fcauptkontakt closes. 009842/1069 6 »Contact carrier according to one of the preceding addresses, characterized in that the spark arcing contact consists of two legs (9, 9 ', 10, 10'), which unischliessen the main contact carrier (19) and form a wing (11) at the front, under which a spark breaker contact (12) is attached, and through a web (1;>) are connected to which a spring £ 17) acts 7. Contact carrier according to one of the preceding claims, characterized in that the main contact carrier (19) is formed from a rod of large diameter "