GB532976A - Improvements in or relating to electric metering apparatus - Google Patents

Abstract

532,976. Power and supply meters. SANGAMO WESTON. Ltd. Sept. 21, 1939, No. 26364. Convention date, April 17, 1939. [Class 37] A meter stresses a spring through a differential gear to an extent depending on the power so as to indicate power and maximum demand and also the integrated energy. The disc 60, Fig. 2, of an induction type energy meter drives a worm-wheel 64 on a shaft 65 which carries a notched wheel 100. This causes contacts 104 to engage and disengage and thereby make and break the circuit of an electromagnet 107 which steps round a ratchet wheel 113 mounted on a shaft 114, in correspondence with the motion of the shaft 65. The shaft 114 drives the counting train 71 and also one sun-wheel 76 of a differential gear, the other sun-wheel 78 of which drives a damping disc 84. The planetwheels 88 of the differential gear are carried by a shaft 89, rotation of which is controlled by a spring 91. The shaft 89 carries a pusher arm 93 which engages a maximum demand pointer 94 and may also carry an indicating pointer. In a modification the shaft 65 is geared to the shaft 114, the contact breaker 104, magnet 107, and ratchet-wheel 113 being dispensed with. The Specification as open to inspection under Sect. 91 comprises also the following subject-matter, which does not appear in the Specification as accepted. In the demand meter shown in Fig. 2 (Cancelled) a conducting disc 14 is mounted on a shaft 11 so as to rotate in the air gap between voltage aud current magnets 16, 20. Rotation of the disc 14 due to eddy currents induced therein is opposed by a spiral spring 25 and its motion is damped by a copper or aluminium disc 34 driven from the shaft 11 by gearing 29, 30 and rotatable between the poles of permanent magnets 35. Driven from the shaft 11 by bevel gearing 40, 41 is a shaft 42 carrying a pusher around 47 which passes through an arcuate aperture in a dial plate 46 and is provided with a pointer 49 indicating power. The pusher arm 47 engages a pin 51 carried by a maximum demand pointer 52 which is thus moved forward but held at its maximum position by a bowed friction spring 55.