GB360857A - Device for adjusting the contact period in electro-magnetic clock-winding devices - Google Patents

Abstract

360,857. Electric clocks. SCHLENKER, A. E., 19, Fabrikstrasse, Schwenningen-on- Neckar, Germany. Aug. 11, 1930, No. 23980. [Class 139.] A device for electromagnetically raising a weighted lever driving the clock in which current is controlled by a contact pin on a spring-controlled lever bearing on the edges of coaxially pivoted conducting and insulated segmental plates in such a manner that the movement of the currentcarrying plate during the operating stroke of the electromagnet raises the contact pin off a shoulder on the spring-controlled insulating plate so that the latter in turn when released rotates to raise the contact pin from the conducting plate and break the magnet circuit, is provided with an adjustably mounted guide on the insulating plate to vary the period of contact between the contact pin and the conducting element. As shown in Fig. 1, the weight lever 8 is mounted rigidly on the shaft carrying the electromagnet armature and is connected by an insulating pin 9 to a pivoted conducting segment 1 on the edge of which normally bears a contact pin 3 carried by a pivoted spring- controlled arm 2. The pin 3 also engages a shoulder on the edge of a co-axially pivoted insulating plate 4. During the operating stroke of the electromagnet to raise the weight lever 8 the contact pin 3 rides on the inclined face 11 of the plate 1 until it is raised sufficiently to clear the shouldered portion of the insulating plate 4, Fig. 2, when the insulating plate 4 snaps across under the action of a spring 5 by the amount permitted by a slot 10 therein over the connecting pin 9 so raising the contact pin 3 from the conducting plate 4, Fig. 3, and breaking the electromagnet circuit. To vary the period in which the pin 3 remains in contact with the surface 11 of the conducting plate 1 the insulating plate 4 carries a pivoted metal arm, Fig. 7, secured thereto by screws 4a, 4b and formed with a slot 7a, so that it may be adjusted to various angular positions to vary the amount of lift necessary to raise the pin 3 past the shoulder on plate 4. Current is led to the plate 1 through a blade spring 12 bearing on a pin 13 projecting laterally from the plate.