GB528518A - Improvements in or relating to measuring instruments - Google Patents

Abstract

528,518. Counting-apparatus. TELEFONAKTIEBOLAGET L. M. ERICSSON. April 28, 1939, No. 12809. Convention date, April 29, 1938. [Class 106 (i)] [Also in Group XXXVI] The output and duration of energy between each two of a number of arbitrary load ranges of a varying quantity is measured by a subtraction method. A shaft I, Fig. 3, is driven by ratchet gear Ea from an electricity meter Im and has fixed on it sun-wheels V1-Vn. Sunwheels H1-Hn are rotatably mounted on the shaft I and are driven by gearing E1-En from a constant-speed shaft P1 which is driven by a clock or synchronous motor M. The gearing E1-En is so arranged that the sunwheels H1-Hn are driven at progressively increasing speeds corresponding to the different load limits E1-En, Fig. 1. Differential wheels D1-Dn are driven by the sun-wheels at speeds proportional to the difference between the actual load and the different load limits E1-En and may drive unidirectional counters indicating the energy consumed above these limits. Alternatively they may drive the sun-wheels of differential gears S1-Sn-1 mounted rotatably on a shaft P3, alternate differential wheels being provided with an intermediate pinion U so that the sun-wheels of the differential gears S1-Sn-1 rotate in opposite directions. The differential wheels of these gears consequently rotate at speeds proportional to the difference of the speeds of adjacent differential wheels D1-Dn and drive, through unidirectional gearing, counters Kwh, H indicating the energy consumed between adjacent load limits. In order to measure the duration at the several load limits, each of the differential wheels D1-Dn closes a snap-action switch when the planet pinion moves in a positive direction and opens it when the rotation is negative. This switch controls a circuit to a synchronous clock, and may be used for signalling and controlling purposes.