Patent GB-521952-A (GB)
Title: Improvements relating to apparatus for indicating rate of consumption of energy
IPC: G01R11/56
Filed: 1938-11-28
Abstract: 521,952. Rate of consumption of energy indicators. GOULD, R. H. Nov. 28, 1938, No. 34661. Convention date, Nov. 27, 1937. [Class 106 (i)] [Also in Group XXXVI] During a chosen interval of time, a number of wheels acting as storage wheels are successively rotated, by a driving device actuated from a meter, for a definite fraction of the said time interval each at a speed proportional to the rate of consumption during the period it is being driven, the rotation of each wheel being imparted to an indicator operating mechanism, each wheel being in turn zeroized and this backward movement imparted to the indicator operating mechanism so that the indicator reading corresponds to the difference between the setting movement, occurring in successive registering intervals. Every time a unit of energy passes through a meter (not shown) an impulse is sent to an electromagnet 1 which operates a pawl driving a ratchet wheel 3 connected to a shaft carrying a driving wheel 4 engaging one of fifteen storing wheels D<SP>1</SP>, D<SP>2</SP>. The storing wheel at this time also engaging gearing 5 connected to a pointer 18. The storing wheels are carried on a disc 6 which is periodically advanced by clock controlled mechanism. The storing wheel is locked by engaging a fixed ring 7 as it leaves the driving wheel 4. The succeeding storing wheel is first brought into engagement with a return wheel 8 which is under the action of a spring 9 continually tensioned by the clock mechanism. The return wheel 8 drives the storing wheel back to the zero position defined by the engagement of a pin on the storing wheel with the disc 6. This backward movement is also communicated to the pointer 18 by the gearing 5. The pointer 18 thus shows at any time the energy consumed during the time taken for the disc 6 to complete a revolution and thus the rate of consumption of energy with relation to this period. A second friction held pointer is pushed by the pointer 18 and indicates the average maximum reached. The driving wheel 4 and the return wheel 8 are locked by a gapped ring secured to the disc 6 when they are not engaged with a storing wheel. The movement caused by any impulses received by the electromagnet 1 while the driving wheel 4 is locked are stored in a spring 16 connecting the ratchet wheel 3 to its shaft. In a modification, Fig. 3, a wheel H on the consumption-meter shaft closes contacts J to complete a circuit R, J, Q, I, RM, whereupon the magnet RM closes contacts GP. When the contacts J open, a magnet OM is energized and operates a pawl O to advance the ratchet wheel F driving the driving wheel E engaging a storing wheel D'. The magnet OM also opens contacts Q, I which breaks the circuit of the magnet RM whereupon the circuit returns to the initial condition. When a storing wheel is not engaging the driving wheel E, a member H moves to lock the pawl O and keep the contacts Q, I closed. The impulse is thus stored until the lock N is removed. When a storing wheel D<SP>1</SP> is being driven by the driving wheel E it is also in engagement with a wheel B on the shaft C of the pointer. A spring within the storing wheel is tensioned during this period, the storing wheel being locked by engaging a fixed ring L when the storing wheel is moved away from the driving wheel. When a storing wheel is moving towards the driving wheel E it first engages a wheel B on the pointer shaft C, the spring in the storing wheel returning it back to zero, this movement also turning the pointer backwards. The storing wheels may be given initial settings by a hand-operated wheel.