DE1064588B - Scissor contact for disconnector - Google Patents

Description

Under a scissor contact for disconnectors where the isolating distance is in the direction of the axis of the Post insulator is and can be bridged by scissors-shaped contact arms, the designed as a cylinder rod or sleeve mating contact on one or more more or less is attached to movable conductor cables, one understands the two pincer-shaped or gripper-shaped ends of the two scissor arms, between which the rod-shaped or sleeve-shaped counter-contact when switched on is clamped transmitting current.

For the formation of these scissor contacts, a number of proposals have become known that are mainly deal with measures that ensure the safe capture and seizure of the in its local To accomplish situation within certain limits variable counter-switching piece.

It is Z. B. also a circuit breaker has become known, which is designed as a pliers and with horn-like Movable contact piece provided with approaches when gripping the fixed counter-contact piece can deform elastically, so that the tong arms, depending on the contact pressure, the counter contact piece hold on resiliently. Since the tong jaws are arranged at the end of the tong arms, this pressure is applied but relatively small. Also, the horn-like lugs are only at the end of the forceps little pronounced, so that it is easily possible that the mating contact piece, which is also in the relatively long pliers jaws can perform a considerable sliding movement in the vertical direction, easily slides out of such a notch. In addition, it is known that such a sliding movement leads during the transmission of high currents, for example short-circuit currents, to a destruction of the Contacts.

Knife disconnectors are also known in which between the fixed contact jaws, between which the movable switch blade is inserted, on its own next to the contact jaws Retaining brackets pawls are provided. The release of the switch blade from the locked position However, this can only be achieved by additional levers and an additional one acting on the end of the cutting knife Switching movement take place.

A device on a circuit breaker with a disconnecting knife has also become known, in which the Separating knife has two relatively movable contact parts, one of which has two due to the weight or the pressure of the opposing contact actuated gripper jaws and their other as a support is designed for the mating contact and also carries rotatably fastened locking hooks that are in the switched-on state in engagement with the gripper jaws scissor contact for disconnectors

Applicant:
"Elin" corporation
for electrical industry,
Vienna

Representative: Dipl.-Ing. C elements, patent attorney,
Deggendorf, Krankenhausstr. 26th

Claimed priority:
Austria from December 22, 1954

Hans Manzinger and Peter Feike _r Vienna,
have been named as inventors

reach the supporting part and thereby lock both parts together. This arrangement has one extremely complicated structure and also has the disadvantage that special precautions for the current transfer must be made because the two contact parts are movable with respect to the knife end are. When switching on, in which the mating contact piece initially only in loose contact with the Moving bearing contact comes and is only centered by the gripper jaws, become large one-sided Forces acting within the device that can lead to failure of the device, while the entire very considerable weight is due to a spring force storage device during the switch-off process of the conductor cable must be lifted with mating contact in order to initiate a separation.

The invention relates to a device on scissors contacts for circuit breakers with in the direction of Axis of the post insulator lying isolating distance, which is made by moving contact arms which are designed in the shape of scissors Can be bridged, the contact arms being extended beyond their scissors swivel joint pinch a mating contact designed as a cylindrical rod or sleeve between them, for a locking device for securing the current short position is provided, which is from Scissor contact comprised mating contact piece under all operationally possible circumstances, for example when sudden ice shedding of the conductor cable carrying the counter-contact piece in a current-locked state able. According to the invention, this is thereby achieved

909 610 /? SD

Claims (6)

achieved that each of the two mutually pivotable scissor contact arms has one or more locking thumbs arranged in such a way that the mating contact piece is held at the bottom of the opening formed by the two scissor contact arms, but that from a certain opening angle of the scissor contact arms the locking is ineffective. The locking device is very simple because the bottom of the scissor opening serves as a support for the counter-switch. In addition, with regard to the contact pressure to be applied by the scissors contact on the scissors, the force transmission that can be achieved in the best case becomes effective. According to a further proposal of the invention, the locking thumbs provided on the scissors contact arms are accommodated in recesses in the scissors contact arms and are designed to be rotatable about axes mounted in these. According to the invention, the locking thumbs are designed to be somewhat laterally movable in the direction of their bearing axis, and an orientation spring is assigned to each of them, which keeps the locking thumb in the locking position, except because of its center of gravity. The mating contact is thus entered by evading the locking thumb against the spring force. According to the invention, a leaf spring which is arranged and fastened in a recess in the scissors contact arm can advantageously serve as the orientation spring. With regard to various inaccuracies, including those in the position of the mating contact piece, it is also advantageous if at least two locking data are arranged on each of the scissor contact arms (as can be seen from FIG. 1), each of which can also be moved somewhat in the lateral direction and each of which has its own orientation pen. In view of the high voltages for which such circuit breakers are used, it is desirable that the more or less sharp-edged locking thumbs do not protrude beyond the outlines of the scissors contact arms, especially not to the outside. This is achieved in that, as already mentioned, the locking thumbs are arranged in recesses in the scissors contact arms and only the part of the locking thumb required for locking protrudes from the outline of the scissors contact arm. In addition, according to the invention, each locking thumb is designed in such a way that it adapts to the shape of the mating contact on the mutual contact surface. The invention is explained in more detail with reference to the drawing below. Fig. 1 shows the locking device according to the invention in side view and Fig. 2 shows the same in longitudinal section. 1 and 2, the contact arms, which act as scissors, are designated with their pincer-shaped ends 3 and 4, between which the counter-contact piece 5 is located in the switched-on state. The bolt 6 forms the hinge point of the scissors. The catching of the mating contact piece is facilitated by the horn-like ends 7 and 8 of the pliers. The locking thumbs 9 are pivotably mounted in the axes 10 and are held in the locking position by means of the springs 11 and because of their center of gravity. Godfather ν τ λ ν s ρ rο c η ε: 1. Scissors contact for circuit breakers with an isolating distance in the direction of the axis of the post insulator, which can be bridged by moving contact arms designed in the shape of scissors, the contact arms extending beyond their scissors swivel joint clamping a counter-contact designed as a cylindrical rod or sleeve between them and clamping it in this Holding the position by a locking device, characterized in that each of the two mutually pivotable scissor contact arms (3, 4) has one or more locking thumbs (9) arranged in such a way that the mating contact piece (5) at the bottom of the scissors contact arms (3, 4) formed opening is recorded, but that from a certain opening angle of the scissors contact arms (3, 4) the blocking is ineffective. 2. scissor contact for disconnector according to claim 1, characterized in that the locking thumbs (9 ) provided on the scissor contact arms (3, 4) are accommodated in recesses in the scissor contact arms (3, 4) and are rotatable about axes (10) mounted in these. 3. scissors contact according to one of claims 1 and 2, characterized in that the locking thumbs (9) are formed somewhat laterally movable in the direction of their bearing axes (10). 4. scissors contact according to one of claims 1 to 3, characterized in that each locking thumb (9) is assigned an orientation spring which holds the locking thumb (9), except because of its center of gravity, in the locked position, and the entry of the mating contact (5 ) takes place by evading the locking thumb (9) against the spring force. 5. scissors contact according to one of claims 1 to 4, characterized in that each of the locking thumb (9) adapts to the shape of the mating contact on the mutual contact surface. 6. scissors contact according to one of claims 1 to 5, characterized in that a leaf spring (11) is provided as an orientation spring. which is arranged and fastened in a recess of the scissors contact arm (3, 4). Considered publications:
German patent applications A 5164 VIIIb / 21c (published on 25.9.1952), A 5521 VIIIb / 21c (published on 18.12.1952), L 8318 VIIIb / 21c (published on 3rd July 1952);
Swiss Patent No. 296 803;
U.S. Patent Nos. 1,723,290, 2,567,606. 1 sheet of drawings © 909 610/289 8.59