GB383829A - Improved gear changing device more particularly for use in electrical apparatus - Google Patents

Abstract

383,829. Supply meters ; controlling change-speed gearing. LANDIS & GYR AKT.-GES., 1, Hofstrasse, Zug, Switzerland. Feb. 29, 1932, No. 6024. Convention date, March 18, 1931. [Class 37.] In variable-speed gearing for use particularly in electrical apparatus such as multiple tariff electricity supply meters, the gear wheel 32 effecting the change-over from one toothed gear 28 to another 29 is actuated by a Ferrari relay. This relay comprises a magnet winding 1 on a core 2 which is provided with poles 5..8, of which two poles 5, 8 are shaded as at 3, 4. A magnetic shunt 11 is carried on a non- magnetic support 14 secured to the core 2 at 17 and serves to direct the flux through the conducting armature disc 15 which is carried in bearings on the member 11 and a non-magnetic bar 13. The spindle of the disc 15 is geared at 12 to a wheel 21, on the spindle of which a spring-returned wheel 24 is carried. A notch 22 on the wheel 24 engages a pivotal lever 27 on rotation and effects the change-over of the gear 25 carried thereon. The gear 26 is mounted on the spindle of a meter-driven driving gear 32. On energization, the disc of the Ferrari relay rotates and turns the wheel 24 until the tension of the spring 23 balances the torque of the motor. In this position the stop 22 has engaged and tilted the lever 27 so that the pinion 32 has just engaged the gear 29.