Patent GB-585383-A (GB)
Title: Improved maximum demand metering device
IPC: G01R11/60
Filed: 1944-12-21
Abstract: 585,383. Supply meters. LANDIS & GYR SOC. ANON. Dec. 21, 1944, No. 25627. Convention date, Dec. 24, 1943. [Class 37] A maximum demand meter is provided with a counting mechanism which continuously registers the values of the maximum positions reached, and with a time controlled resetting device which after the expiration of a reading period automatically brings a maximum demand indicator back from its maximum position reached within this period into the zero position. The meter spindle drives a counting mechanism Z1 through a worm wheel 1 and gear wheels a, b, 2, and also a maximum demand indicating mechanism Z2 through gearing c, d, 4, 5. The wheel 5 turns a driver 6 away from its zero position on a stop 7 and rotates forwardly a maximum demand wheel 8. This drives a wheel 9 which rotates freely backwards a spring pawl of an overhauling gear 10. The registration period is determined by a synchronous motor I which rotates a disc 12 through spindles II, III, IV, V. The disc 12 by means of a pawl 13 temporarily disconnects the wheels 4, 5 so that the driver 6 is returned to the stop 7 by a spring 14. At the end of the month the motor I turns back the maximum wheel 8 and with it the driver 6 up to the'stop 7, through the spindles II, VI, VII, VIII, IX, X, XI, XII. The wheel 9 and the pawl of the overhauling gear 10 are thereby rotated forwardly so that a calibration drum 11 is rotated forwardly through gearing e, f. This monthly resetting is initiated by the spindle VIII being coupled to the spindle VII for the duration of the resetting by means of a pawl 15 controlled by discs 16a, 16b, 16c. These are driven through wheels 17 ... 23 so arranged that there is a velocity ratio of 1 : 100 between each of the discs 16a, 16b, 16c and its neighbour, the disc 16c making one revolution in 30 days. Each disc has an indentation on its circumference and when these are all at the same level and opposite the pawl 15, this drops into the indentations and oscillates the spindle VIII so that the coupling with the motor I takes place. A further counting mechanism Z3 may be driven from the wheel 9 through a wheel 24 to show the maximum position at the moment. The synchronous motor I may be replaced by a clock. With a monthly reading period the time element may consist of a calendar clock which takes into consideration the number of days in each month. The maximum demand device may be subject to remote control, the meter armature and counting mechanism Zl being separated from the rest of the device and an impulsetransmitting contact being arranged on the meter side and a channel of transmission and a receiving relay on the maximum demand indicator side. Instead of a separate time controlling element the meter itself may be employed to drive both the periodic release and also the counting mechanism. In this case the meter receives a constant torque in addition to that proportional to the total consumption. These torques united in the meter are separated by a differential gear, one sun wheel of which is kept by an escapement at a constant speed corresponding to the speed of rotation produced by the constant torque and thus separates this speed from the speed of rotation proportional to the total consumption. The variable torque is then applied to the second sun wheel and thus to the counting mechanism and to the maximum demand device.