CH348750A - switch device - Google Patents

Description

Switching device The subject of the present invention is a switching device for obtaining an intermittent current of constant frequency, comprising a pendulum and spiral regulator actuating a circuit breaker having two contacts pressed 61astically one against the other and a non-electrically conductive movable member periodically brought between these contacts to interrupt the circuit.

This device is characterized in that said movable member is driven from the balance so as to undergo a to-and-fro movement corresponding to the oscillations of the latter, and in that it is designed to separate said contacts during the part of its movement comprised approximately between two of its successive passages through it, its median position corresponding to the equilibrium position of the balance, so as to obtain alternate periods of opening and closing of the circuit breaker of approximately the same duration, independent of variations in the amplitude of oscillation of the regulator.

The appended drawing shows, by way of example, one form of execution of the object of the invention.

fig. 1 represents the entire device, actuated by an electric movement.

fig. 2 is a detail view, on a larger scale, of the electrical movement contactor.

Figs. 3 and 4 are views on a larger scale, respectively from the front and from the side of the circuit breaker of the device.

The switch device shown is intended for use in a vehicle recording tachometer. It comprises a regulator 1 with balance wheel and hairspring driven by an electric movement 2.

This movement comprises a bridge 3, raised, which is extended by two parallel legs 4 and 5, bent at 90°, into which the pivots of Faxe 6 of the spiral balance 7 of the regulator penetrate. The axis 6 carries an armature 8 arranged to move in the air gap of the core 9 of an electromagnet 10 also fixed on the bridge 3.

The electromagnet 10 comprises a winding on which the winding is connected, on the one hand, to one of the poles of an electricity source 11 and, on the other hand, to a contactor.

This contactor, represented on a larger scale in FIG. 2, comprises a finger 13 integral with Faxe 6 and sleeps 1'extremit6 comes, during the movement of the balance, meet 1'extr6mit6 dune plate-spring 14 electrically isolated from the bridge 3 and which is connected to the winding of 1'61electro- magnet.

The end of finger 13 forms an inclined paddle. The end of the slat 14, opposite the pallet of the finger 13, is obligated, on passing from RTI ID="0001.0267" WI="8" HE="4" LX="1845" LY="2109"> that - ci, to move parallel to Faxe 6, by sliding on one or the other of the inclined sides of the pallet, according to the direction of oscillation of the pendulum.

Each time the balance wheel alternates, the contactor members 13 and 14 meet and cause the circuit of the electricity source 11 to be closed, which has the effect of communicating a pulse to the armature 8, and thus to the balance wheel.

To avoid electrically isolating one side of the contactor finger 13, it is expected that in one direction of oscillation of the balance, the contact duration will be longer; this is achieved by the given rest position ä. blade 14 at the tip is placed well below the center of finger 13.

The regulator actuates a circuit breaker 15 (fig. 3 and 4), which comprises a metal support 16 fixed by a screw 17 to the plate 18 of the movement.

This support has a lower arm 19 which has a lateral tab 20 on which are fixed two metal lamellae, 21 and 22, which are bent at their upper end to form contacts 23 and 24 resting 61astically on one side. against Fautre. Strip 21 is grounded by Support 16, while strip 2.2 is electrically insulated from the Support by insulating rings 25 mounted on an insulating sleeve 26, and has a lug 27 constituting one of the terminals of the circuit, adopts the other terminal is constituted, for example, by a leg 18 'mounted on the plate 18.

The support 16 also comprises an upper arm 28 which has, at its upper end, a pivot 29 for an insulating movable member consisting of a pike 30 cut from a thin sheet of insulating plastic material.

This pike 30 comprises a part 31 in the form of a circular sector coaxial with the pivot 29, on which is formed a toothing 32 meshing with a pinion 33 fixed on Faxe 6 of the pendulum. The pike 30 has a portion 34 intended to pass between the contacts 23 and 24 in order to interrupt the circuit.

Part 30 driven by pinion 33 will oscillate at the same frequency as balance wheel 7 and will thus periodically pass into its middle position shown in FIG. 3 corresponding to the equilibrium position of the pendulum.

In this position, the first edge ant6rieur 35 of the part 34 is at the level of the contacts 23, 24 so that the circuit breaker will be alternately open and closed between two successive passages of said pike 30 in its middle position.

One thus obtains alternating periods of opening and closing of the circuit breaker of the same duration and this practically independently of variations in the amplitude of oscillation of the regulator, variations which could occur along with accentuated variations of the force. 61electro-motive of the source of electricity supplying the movement.

The part 30 of the circuit breaker has cutouts 36 and 37 shaped and arranged so that its center of gravity corresponds approximately with its center of rotation. This part 30 can be made of a very smooth plastic material (calendered sheet or sheet obtained by extrusion) present > both a good coefficient of friction so that the resistance offered by the contacts remains small.

In addition, the repet6s passages of the pike 30 between the contacts 23 and 24 ensure permanent cleaning of the last res.

A limited adjustment of the opening position of the circuit breaker can be obtained by bending more or less the thin part 38 of the Support 16, so as to modify the position of the contacts with respect to the part 30.

Claims (5)

CLAIM Switching device, for obtaining an intermittent current of constant frequency, comprising a regulator with a pendulum and spiral actuating a circuit breaker having two contacts pressed elastically against each other and a movable member which does not conduct electricity periodically brought between its contacts for interrupting the circuit, characterized in that the said movable member is driven from the balance so as to undergo a to-and-fro movement corresponding to the oscillations of the latter, and in that it conforms to separate the said contacts during the part of its movement comprised approximately between two of its successive passages in its median position corresponding to the equilibrium position of the balance, so as to obtain alternate periods of opening and closing of the circuit breaker of approximately the same duration, independent of variations in the amplitude of oscillation of the regulator. SUB-CLAIMS 1. Device according to claim, characterized in that said member is made of plastic material and comprises a thin part intended to pass between the contacts and a toothing meshing with a pinion entrain6 by the first pendulum. 2. Device according to claim and sub-claim 1, characterized in that said member is pivot6 and in that said de.nture is formed on a sector of said center member on its axis of rotation. 3. Device according to claim and sub-claims 1 and 2, charact6ris6 in that said body is constituted by a flat piece cut & in a thin sheet of plastic material. 4. Device according to claim and sub-claims. 1 to 3, characterized in that said pike is co-nformed so that its center of gravity coincides approximately with its center of rotation. 5. Device according to claim and sub-claims 1 to 4, characterized in that the contacts, and said pike are mounted on a common metal support which has a thin part capable of being easily deformed in order to adjust the relative position of RTI ID="0002.0543" WI="13" HE="4" LX="1498" LY="2384"> contacts and said part.