Intermittence-responsive working-time indicator

Abstract From the Canadian patent

A working-time indicator that resets itself to a zero position as soon as the supervised work is interrupted for a predetermined, preferably adjustable minimum period of time but neglects all pauses of a shorter duration comprises in combina-, tion, a first or working-time meter that is adapted to measure and indicate the duration of a single period or a succession of spaced periods between an arbitrary number of start and stop pulses received thereby, said first meter being resettable to a zero position by means of a resetting pulse and a second or, idling-time meter that is adapted to measure the period of time following immediately after each stop pulse to said first meter and to compare …