Patent GB-191201871-A (GB)
Title: Improvements in or relating to Integrating Electric Meters.
Inventor: DICKER STANLEY GORDON SINCLAIR
IPC: G01R11/00
Filed: 1912-01-23
Granted: 1912-06-27
Abstract: 1871. Dicker, S. G. S., [Chicago Electric Meter Co.]. Jan. 23. Registering maxima.-A maximum - demand indicator, for use with an integrating-meter, has a non-return pointer moved forward by a driving-means other than the meter, such as a spring or weight, the extent of movement being determined by the meter. Means are also provided for indicating the time of day at which the maximum demand occurs. In the arrangement shown in Figs. 1 and 2, a shaft 5 driven from the meter disk 1 carries a ratchet-wheel 11, with which engages a pawl 10 mounted on a disk 9 secured to a hollow shaft 6, loosely mounted on the shaft 5. A spring 7 is secured at one end to the shaft 6 and at the other end to a post 8. The end of the shaft 6 carries an arm 21 engaging with an insulated non-return pointer 18, which has a friction spring to retain the pointer in any position. The amount by which the spring 7 can advance the pointer during a predetermined interval is limited by the speed of the shaft 5. At the end of the predetermined interval, the circuit of an electro-magnet 14 is closed by means of a contact-maker 23 driven by a clock, and a core 13 is attracted, and causes a flexible cord 12 to rotate the shaft 6 so as to bring the arm 21 back to a zero stop, and at the same time to wind up the spring 7. An arrangement for indicating the time at which the maximum demand occurs is shown in Figs. 1 and 3. A disk 29 carrying a sprinssupported stop 42 is driven by a clock, and makes a complete revolution in twenty-four hours. When the arm 21 is driving the non- return pointer, contacts on the arm and pointer are in engagement, and close the circuit of an electro-magnet 39, thereby driving a pawl 38 against a ratchet-wheel 37, and causing a shaft 30 carrying two arms to turn forward. One arm 32 then bears against the stop 42 so long as the non-return pointer is being moved forward. The other arm 31, Fig 1, is mounted to correspond in position with the arm 32, and indicates the time on a dial. The spring mounting of the stop 42 allows the stop to move past the pointer when this is stationary. This arrangement may also be used for indicating the day or week. or any period during which it is desired to know the maximum demand. In another arrangement of maximum-demand indicators shown in Figs. 8, 9, and 13, a looselymounted wheel 85 driven from the meter carries a pawl engaging with a wheel 87 fixed on a shaft 86, which carries an arm 94 engaging with a pin on the shaft 98 of a non-return pointer 63. A flat spring 97 engages with the shaft to retain it in any position. A pinion 89 secured to the shaft 86 is engaged by a vertical rack 90 with a weight 93, which serves to drive the pointer forwards. The rack is raised at the end of each predetermined interval by a pin 103, moved vertically in a slot by means of a cam 104. The cam is secured to a shaft which also carries a wheel 106 connected by a spring 107 with a worm-wheel 108 driven by a synchronous or other constant-speed motor 115. The wheel 108 is provided with a pin, which, once in each revolution, forces back a catch 118, thereby releasing the disk 106; the spring 107 then causes the cam to lift the rack 90, the catch falling back into engagement with a lug on the disk 106. A pinion 100 on the shaft 86 drives the integrating-mechanism.