GB916330A - Improvements in or relating to maximum demand indicating mechanism for electric supply meters - Google Patents

Abstract

916,330. Maximum demand meters. SANGAMO WESTON Ltd. May 6, 1959 [May 7, 1958], No. 14635/58. Class 106 (3). The integration period of a maximum demand meter is determined by the number of projections 39 or recesses on a cam disc 38 which is rotated step-by-step by a continuouslyoperated synchronous electric motor 10, and an eccentric pin 21 which periodically engages the teeth of an index wheel 22. The cam disc 38 may be replaceable or may have teeth which can be swung into and out of operational positions to vary the integration period. The spindle of the associated metering mechanism drives, through gearing, gear-wheel 30 mounted on shaft 31, which is mounted at one end in a bracket 32 forming part of a lever 33. Also attached to lever 33 is a follower pin 37 which is biased to follow the periphery of cam disc 38 by weight 36. When pin 37 reaches a projection 39, lever 33 swings about pin 34, and gearwheel 42 mounted on shaft 31 is unmeshed from gear-wheel 43 ; pusher arm 45 then ceases to drive pointer 46 and returns to the zero position under the influence of weighted sector gear member 50. The pointer 46 is maintained in the position it has attained by a damping device 48. The projections 39 are arranged so that pin 37 comes into contact with them at the same time that pin 21 is coacting with a tooth of index wheel 22. The stepwise movement of wheel 22 is rendered more sharp by a spring- loaded index arm 41 with pin 40 which cooperates with the wheel teeth. Specification 916,329 is referred to.