Abstract: An electric watthour meter provides for selectively accumulating energy consumption in one of at least two registers according to the value of a parameter relative to a predetermined threshold level. The parameter may be a load current, a line voltage, a time of day or a combination thereof.

Abstract: A reset mechanism for a cyclometer register employs teeth formed on an axially resiliently urged shaft to engage abutments formed on cyclometer drums to permit resetting of the cyclometer drums. The teeth are normally maintained out of alignment with the abutments by resilient urging of a spring and are manually displaced into engagement for resetting. Carry pinions on a pinion shaft are urged into mesh with respective gearwheels on the cyclometer drums by a pair of springs. During resetting, the pinion shaft, with its pinions, is displaced outward. When the pinions are displaced outward, one or more teeth on each pinion enter a window disposed adjacent thereto in the frame of the cyclometer register. The windows lock the pinions into a predetermined angular position which enables proper mesh to be made with the gearwheels at the conclusion of the resetting operation when the springs again urge the pinions into meshed engagement.

Abstract: A flip-over mechanism for a cyclometer register includes an eccentrically balanced fly-wheel freely rotatable on a drum shaft between a driver drum and a first driven drum, each drum being marked with decimal digits 0-9. The driver drum is driven in smooth rotation by a measuring device whose measurements are to be accumulated. At a certain point in its rotation, the driver drum engages and begins rotating the fly-wheel. As the driver drum is rotated into a position at which it performs a 9-to-0 transition, the fly-wheel becomes overbalanced and rotates forward on its stored potential energy until a striker thereon engages a tooth of a first carry pinion located between the fly-wheel and the first driven drum. This applies a momentary forward tap to the first carry pinion. The tap on the carry pinion provides a substantially instantaneous carry operation to be performed in all of the driven drums which are in position to require a carry.