SU32624A1 - A device for comparing the strengths of currents of two circuits, measuring resistance, etc. - Google Patents

Description

To compare the values of the measured resistances or currents in various measuring circuits, the telephone is usually used as an indicator. Sometimes in such cases, the telephone is switched on in series with a suitable chopper, for example, with an oscillating thread.

The present invention is a constructive embodiment of a device for interrupting current in order to obtain sound in a telephone included in a measurement circuit.

The invention consists of two stationary contact rings arranged one above the other, divided first into two, and the second into four parts isolated from each other, and contacts in the form of wires electrically connected in pairs and fastened on a rotating insulating rod. When the latter is rotated, the wire contacts move along the above ring contacts and connect the compared circuits to the telephone.

In FIG. 1 shows a general view of the device; FIG. 2-separately swivel rod; FIG. 3-wiring diagram.

On insulating board 7 fortified

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conductive ring, divided into four isolated from each other parts 2, 3, 4, 5, attached to the clamps. Above the lower ring on the insulating plate is located the same diameter upper ring, divided into two isolated from each other parts 6,.

The upper ring with the help of the insulating strap 8, fastened to the insulating plate, is fixed on the copper stand 9 with the clip W, which is electrically connected to the part 6 of the upper ring. Through the latter, a turning insulating rod 7 / (Fig. 2) passes upward through sleeve 72 and below resting on board 7. The sleeve is fixed to a conductive L-shaped stand / J with a clip 74 for telephone wire.

Two conductive rods 75, electrically interconnected and fitted each with two axes, on which the holders J6 of movable wire contacts are pivotally mounted, are fastened on the insulating rod. These holders are L-shaped, and in the transverse parts there are holes, with which the holders fit on the indicated axes, and in the longitudinal channels, in which the ends of the flexible, for example, tinsel, clamps are clamped.

wires 77 connected to the other ends with rods 15. Elastic steel wires 18 are clamped in these channels, which play the role of the above-mentioned moving contacts touching both rings.

When using the device, it is switched on according to the scheme of FIG. 3, with the following symbols 19 — current source, 20-comparable source, 21-telephone; the remaining digits denote the same parts as in FIG. 1 and 2. If you move the rod //, slightly turning it, a sound proportional to the current strength will be heard in the phone. The movement of the contact wire along, for example, part 2 of the lower ring will be accompanied by the sound caused by source 19; when the wire goes to part 3, the sound will be caused by the compared source 20,

The subject matter of the invention.

A device for comparing the currents of two circuits, measuring resistances, etc., using a telephone connected in series to a measuring circuit, characterized by the use of two annular contact surfaces arranged one above the other, separated by the first two contacts 6 and isolated from each other , the second is on the four pins 2, J, 4 and 5, on which surfaces the fortified on the insulating rod is rotatably mounted // J8 contacts in the form of wires, electrically connected in pairs vertically and intended for For each contact, connect the compared circuit to the phone.

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