DE2017348A1 - Electric selector switch - Google Patents

Description

Electric selector switch priority? 19 “April 1969? Great Britain? No. 20090/69

The invention relates to electrical switches of the type in which a common contact is arranged that it successively forms electrical contact with each of a plurality of individual contacts, the individual Contacts are arranged on a body made of electrically insulating material.

In such switches, the common contact can be moved either manually or electromechanically and can either serve as a terminal of the switch or simply as a bridge between contacts. The individual contacts can be designed in the form of individual electrically conductive elements, which on the body of electrically insulating material are attached. However, the individual contacts and the body made of electrically insulating material can also be in the form of a printed circuit board.

Switches of this type are used as selector switches in .automatic Telecommunications systems and data processing systems and equipment

Bavarian Club Munich 820933

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AMP-2685 ■ - - -.- 2: - .- /.; ^::.

Two disadvantages laelEanntes .elefcijÄisqiier · Sehalter the aar type are again the rapid wear de ^ .gemeinsamen contact; which by its eq ^ eifen aii AEEN individual contacts and the surface of the 'consisting of electrically isolierendem- material body zwisclien the contacts " is effected, as well as the smearing τοη electrically conductive material over the surface of the body consisting of ^: electrically, isolating a material between: lienachbaren individual contacts, whereby short circuits are caused between these contacts »

An electrical selector switch having a common contact disposed so wet er.aufeinanderfolgend ^ with each of a plurality of individual contacts electrical contact · forms, with the individual contacts are disposed on an existing body of electrically insulating material, according to the invention is characterized by means which prevent the contact surface or the contact surfaces of the common contact from coming into contact with the surface of the body made of> electrically insulating material.

The means mentioned are preferably such that the iCon « contact surface or the contact surfaces of the common contact only on part of the contact surface of each individual contact attack.

In such a switch, further means are provided which, during operation, cause the electrical circuit including the "common" contact to be interrupted before the contact surface of the common contact ceases to act on an individual contact, and which close the electrical circuit including the common .Contact ■ only after the common contact engages one of the contacts »Such an arrangement prevents a spark overlay between the common contact and the individual contacts, and in this way the service life of the switch is extended ■■ . ..

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AMP 2685. - 3 -

Other features and usefulnesses of the invention will become available readjusting using an exemplary embodiment with reference to the. Figures described «Show from the doors *

FIG. 1 is a diagrammatic plan view of part of the selector switch; and

FIG. 2 shows a sectional view along the line II-II in FIG.

In the drawings the switch is a rotatable selector switch and comprises a printed circuit board 1 having a centrally located annular common conductor 2 and a plurality of individual contact conductors 3 (only some of which are shown) arranged with their contact ends around symmetrically the conductor 2 around and with respect to this are arranged radially outwardly at a distance e. The conductors 2 and 3 are led to the edges of the plate 1, where they can be connected by means of edge connectors. A shaft 4 of an electric stepping motor (not shown) passes through an opening in the center of the conductor 2. The shaft 4 carries a resilient metallic grinding arm 5 which has a contact part 6 which forms a common contact and is arranged so that it is a bridge between the conductor 2 and each of the individual contacts 3 forms. The contact part 6 is shell-shaped for the formation of contact surfaces which engage the conductors 2 and 3, and also for the formation of a further surface 7, which is fastened with a plurality of on the plate 1 and in a circle around the conductor 2. arranged around projections 8 (only some shown) cooperates. The projections 8 are arranged between the conductors 2 and 3 and lie on extensions of radii of the conductor 2, the 3 ° runny between adjacent contacts the protrusions 8 are fixed to the plate 1 and is available through the conductors 2 and 3 on the disk 1 emerged.

The operation of the switch is as follows: "

009843/1292

AMP 2685 ■ -: - 4 - ·

When the surface 7 of the common contact 6 between two adjacent projections 8 is, the contact surfaces of the common contact 6 in contact with the conductor 2 and a contact 3 held by the spring property of the grinding arm 5 «If the shaft 4 of the not shown Stepper motor is rotated, engages the surface 7 of the common contact 6 on which you are in the direction of rotation of the sliding arm 5 adjacent projection 8, whereby the grinding arm 5 is bent away from the plate 1, so that the Contact surfaces of the common contact 6 out of engagement with the conductor 2 and the contact 3 are raised, as Figure 2 shows. The grinding arm 5 is during its further rotation held in its bent position so that the outer contact surface of the common contact 6 not on the insulating surface of the plate 1 and the inner contact surface of the common contact 6 does not attack the conductor 2. if the outer contact surface of the common contact 6 above the is positioned next contact 3 in the direction of rotation, the surface 7 of the common contact 6 detaches from the projection 8 » so that the grinding arm 5 is straightened and the contact surfaces of the common contact 6 attack the part of the conductor 2 and the contact 3 now lying below them «

As Figure 1 shows, the connection line to conductor 2 is on their connection point with the same forked, and a projection 8 is provided between the two arms of the fork. As a result, the common contact 6 is raised above the connecting line leading to the conductor 2.

The above-described bending of the sliding arm 5 is effected during its step-by-step movement between two adjacent independent contacts 3, so that the outer Contact surface of the common contact 6 not on the insulating Attacks the surface of the plate 1, but only with a part of each individual contact 3 forms contact. In similarly engages the inner contact surface of the common Contact 6 only at spaced apart positions on the conductor 2. :

0Q98V3 / 1292

In this way, the contact surfaces of the common contact 6 are located during each complete revolution of the Squintfarms 5 only in contact with leaf 1 at intervals and not during the entire period of rotation, as it is with known rotary switches the 3? all is. This makes the The wear of the common contact 6 is considerably reduced, and besides, the smearing of conductive material is reduced Prevented over the insulating surfaces of the plate 1 between adjacent individual contacts 3. .

In a modified embodiment of that described above Switch, the projections 8 with the plate 1 can be in one piece be formed, whereas in the embodiment described formed separately and attached to the plate are. ; :;

In the above embodiment, although the Grinding arm rotated by an electric stepper motor, but the invention is equally applicable to switches. which the common contact through a synchronous "electric motor or manually moved.

In the described embodiment of the invention, the switch is indeed a rotatable electrical selector switch, but it is obvious that the invention ^{is applicable in the same way to:} .electric switches, where the '. ·. "joint contact makes a linear movement.

Claims ι

009843/1292

Claims (1)

AMP 2685 - - i.- Claims - !. ^ Electrical selector switch with a common contact, fer is arranged so that it is in sequential electrical contact with each of a plurality of individual contacts "Forms, with the individual contacts on an electrical basis insulating material existing body are arranged, marked. by. Means (7, 8) that prevent the contact surface or the contact surfaces of the common contact (6) with the surface of the body (l) made of electrically insulating material come into contact. 2. Electrical selector switch according to claim 1, characterized in that the means (7, 8) are designed such that the contact surface or the contact surfaces of the common contact (6) only with part of the contact surface of each individual contact (3) Make contact. 3. Electrical selector switch according to claim 1 or 2, characterized in that the means (7, 8) have on the body (1) made of electrically insulating material arranged Yorsprünge (8) 'on'. k which engages a surface (7) of the common contact, which does not form the contact surface or the contact surfaces of the common contact (6). 4e electrical selector switch according to one of claims 1 to, 3, characterized in that the electrical contacts (3) and the body (l) from electrical ' insulating material are designed as a printed circuit board. 5. Rotatable electrical selector switch according to one of the claims 1 to 4, characterized. 009843/1292 AMP 2685 - '«►- ■■■ ■■; ■■ .. ■; that the common contact (6) is carried by a sliding arm (5) which is rotatably mounted with respect to the body (l) made of electrically insulating material is, wherein the individual contacts (5) have contact surfaces, which are arranged in a circle around the axis of rotation (4) 'of the grinding arm (5). 6. Rotatable electrical selector switch according to claim 5 » because there is no η ζ eic h e t that the common Contact (6) during one revolution of the sole arm (5) forms a bridge between a common conductor (2) that of / body (l) made of electrically insulating material is worn, and each of the successive individual Contacts (3) . '? · Electric selector switch-according to one of claims 1 to 4, d a by g e k e η η ζ e i η et that the common contact (6) for performing a straight line Movement is arranged. 09843/1292 Blank page