DE1166894B - Electric switch for high current carrying capacity - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Boarding school KL: H 02 c

Number:
File number:
Registration date:
Display day:

German class: 21c-40/52

S 77793 VIIId / 21 c
January 31, 1962
April 2, 1964

The invention relates to an electrical switch for high current carrying capacity, in particular Lever switch, of whose contact pieces at least one can be changed in this way, in particular resilient loop with opposing current paths forms that the current-carrying loop in the The sense of a contact pressure reinforcement against the mating contact piece opens.

In the case of switches that have become known with current-carrying Loops, the loop is deformed by the movable mating contact piece itself. This has the disadvantage that when opening and touching the cooperating Contact pieces at the points of contact have an undesirably high current density because of small contact areas can occur, which causes rapid wear of the contact pieces. The wear and tear of the contact pieces is still due to a mutual relative movement of the contact pieces when closing supports and thus considerably reduces the service life of such switches.

According to the invention, the aforementioned disadvantages can be avoided in a simple manner by that a switch drive for the movable contact piece with the current loop in such engagement it is possible to bring the current loop to the actual contact closing and opening movement at in Affected contact position located movable contact piece in their open state. It is so by the switch drive the loop before making contact or before opening in its shape changed in a certain sense, in such a way that the cooperating contacts without previous contact are approximated so far that they are only in the correct position by the switch drive released themselves and then come into contact with each other in the correct spatial allocation. The contact loop can expediently according to the further embodiment of the invention with the opposing current paths consist of resilient material, which is designed so that the loop alone is able to apply the necessary contact pressure. Additionally or instead of use of a resilient material can be applied to the loop part facing the mating contact piece Contact pressure spring or the like. Act.

As a rule, it is advantageous to assign the contact loop to the stationary contact piece, however, it is also possible to let the contact loop itself form a contact bridge, which is used opposite stationary counter-contact pieces.

Electric switch for high
Current carrying capacity

Applicant:

Siemens-Schuckertwerke Aktiengesellschaft,

Berlin and Erlangen,

Erlangen, Werner-von-Siemens-Str. 50

Named as inventor:

Heinz Homberg,

Max Huber, Amberg '

Further advantageous embodiments of the invention

result from the following description.

Various embodiments are described by way of example and with reference to the drawings their effect explained. the

F i g. 1 and 2 show the overall arrangement for a schematic representation in front and elevation a switch according to the invention with double break; the

3 and 4 show, in a schematic representation, phases of movement when the switch according to FIGS. 1 and 2 is switched on and off; the
F i g. 5 to 7 show a schematic representation of a contact piece arrangement and the drive for a switch with individual interruption; the

8 and 9 show erne contact arrangement with double interruption, the contact loop as movable contact bridge works.

Between the insulating partitions 1 and 2 is the contact piece arrangement for a current path with the Drive slide 3, the connections 4 and 5 of the stationary contact pieces with the current loop parts 6 and the actual stationary contact piece 7 are arranged. The drive slide 3 is below Interposition of springs 8 and driving pins 9 coupled with a contact bridge 10. Further is with the drive slide 3 a mounted in an elongated hole 11 of the slide 3 toggle lever with his Arms 12 supported using a bolt 13. The free ends of the arms 12 are through a bolt 14 connected to one another, which parts against the inner current path of the loop 6 lays. To prevent burn-offs caused by arcs that may be formed, both the fixed as well as the movable contact pieces additionally with arc conduction horns or the like.

409 557/467

Several of the illustrated contact arrangements can be arranged in a manner known per se can be combined to form a multi-pole switch. The bolts inserted through openings 15 16 hold the switch parts together. The bolts 13 and 14 are in recesses 17 and 18 of the partition walls 1 and 2.

As can be seen from Fig. 3, the slide 3 is at a switch-off movement in the direction of the arrow, d. H. moved up. Through this movement the of The toggle levers formed by the levers 12 together with the bolt 13 are stretched, and thus the loop 6 deformed in the manner shown, i.e. in the sense of a contact opening. Has this deformation and the associated contact pressure reduction reaches a certain level, the springs 8 press the contact bridge 10 from the switched-on position into the position shown. So the contacts are opened. The further movement of the slide 3 finally causes the toggle lever 12, 13 to buckle simultaneous displacement of the bolt 13 away from the lower end of the elongated hole 11 in the sense of a Release of the deformed contact loop 6.

The switch-on movement can be seen from FIG. With the bolt 13 resting on the upper end of the elongated hole 11, the toggle lever is first again 12, 13 stretched so that the contact loop is deformed in the sense shown. This stretching takes place until the contact bridge 10 has moved into the switch-on position (FIG. 1). Then snap the toggle lever 12, 13 through and releases the deformed loops 6 in the sense of a contact closure. It can be seen that with this design, even short circuits without the risk of contact piece welding or a contact piece damage can be switched because at the moment of the contact closure the entire contact piece surfaces lie perfectly on top of each other and, due to the loops, a considerable one, proportional to the current Contact pressure is achieved. Of course, the contact loops can also have contact pressure springs or the like. Be charged. The division of the contact loops into several, e.g. B. on certain Individual current paths that are matched to current intensities are possible within the scope of the invention.

The F i g. 5 to 7 show a schematic representation with omission of all that are not essential to the invention Parts such as connection element, insulating partitions and drives form the design of a contact piece arrangement for a switch according to the invention with single interruption. The contact loop 20 of the stationary contact piece is removed from the current path 21 formed. The contact piece 21 is a movable contact piece 22 opposite, which as a movable Contact bridge formed and with the opposite end 23 in a contact pan 24 is stored. The contact bridge 22, 23 is guided in recesses 25 of the not shown Insulating partitions. The toggle lever for actuating the contact loop 20 consists of the arms 26 and 27 as well as the bolt 28, which is in an elongated hole of a guide part coupled to the drive 29 30 and is performed in the partitions. Also the bolt 31 resting on the loop 20 is guided in recesses in the partition walls. An arc horn 32 is attached to the contact bridge 22, 23 put on. The contact bridge is pressed down by a leaf spring 33.

When the switch is opened, as can be seen from FIG. 6, the drive 29 first moves in the direction of the arrow moved upwards and thus in turn the knee joint 26, 27 stretched. The contact pieces 21, 22 are opened with it. The subsequent pivoting movement of the contact piece 22, 23 in the Joint socket 24 can take place under the action of the spring force of the loop 20 when the knee joint until it was pushed past dead center.

During the closing movement, as can be seen from FIG. 7, again by the levers 26 and 27, the loop 20 is deformed in the sense of a contact opening and at the same time, but before releasing this deformation, the contact bridge 22, 23 by the Leaf spring brought into the on position.

As can be seen from FIGS. 8 and 9, the deformable current loop can also be used as a contact bridge be formed. To operate this contact arrangement, a toggle joint is required that Acts on the current loop 40 like a forceps. The bolts 41 are in the switched-on position according to FIG in recesses 42 of the lever 44 rotatably mounted at point 43. With the levers 44 are Arms 45 connected, which engage the outer sides of the current loop 40 via rollers 46. the Fixed contact pieces are denoted by 47. If the drive 48 is in the sense of a contact opening Moved in the direction of the arrow, the bolts 41 connected to the drive initially lie against the Lever 44, as a result of which they are pivoted about points 43. The toggle lever 44, 45 stretched and the current loop 40 deformed in the sense of a contact opening. When moving on puts the part 49 of the drive 48 on the lower inside of the loop 40 and thus moves the Loop 40 together with drive 48 in the position shown in FIG. The drive 48 is over the bolts 41 guided in recesses 50 of the partition walls, not shown.

The described contact structure offers significant advantages for lever switches, but it does not can also be used successfully with other switch types. Should a switch with the structure according to the invention can also take over switching capacities, so the switch can also be additionally equipped with a switching chamber known per se.

Claims (10)

Patent claims: 1. Electrical switch for high current carrying capacity, especially lever switch, of its Contact pieces of at least one an inherently variable, in particular resilient loop with opposing current paths forms that the current-carrying loop in the sense of a Contact pressure reinforcement against the mating contact piece opens, characterized in that that a switch drive (3, 11-14; 26-31; 41-46) for the movable contact piece (10, 22) with the current loop (6, 20, 40) can be brought into such engagement that it is the current loop for actual contact closing and opening movement when the movable one is in contact position Affected contact piece in their opening state. 2. Switch according to claim 1, characterized in that the current loop (6, 20, 40) from resilient material is made of such strength that a sufficient contact pressure is achieved through them will. 3. Switch according to claim 1, characterized in that in addition the mating contact piece facing loop part is loaded with a contact compression spring. 4. Switch according to claim 1 to 3, characterized in that with each switch closing movement first the current loop (6, 20, 40) is deformed in the sense of a contact opening. 5. Switch according to claim 1 to 4, characterized in that the current loop (6, 20, 40) by means of a toggle lever (11, 12, 13; 26, 27, 28; 44, 45) is operated. 6. Switch according to claim 1 to 5, characterized in that the current loop (20) the fixed contact piece (21) is assigned (Fig. 5 to 7). 7. Switch according to claim 1 to 5, characterized in that the current loop (40) as a contact bridge is formed (Fig. 8, 9). 8. Switch according to claim 1 to 7, characterized by such a design of the toggle lever drive, that the contact closing movement by releasing the contact loop after the moving contact piece has moved into the Closed position takes place (Fig. 8, 9). 9. Switch according to claim 1 to 7, characterized in that that the toggle lever drive in an elongated hole (11) of the drive (3) for the movable Contact piece (10) is performed. 10. Switch according to claim 9, characterized in that the movable contact piece (10) with respect to the drive (3) is resiliently supported (Fig. 1). Considered publications:
German patent specifications No. 973 459, 305 257. 1 sheet of drawings 409 557/467 3.64 0 Bundesdruckerei Berlin