Patent GB-190218858-A (GB)
Title: Improvements in Measurement of the Energy of Electric Currents.
Inventor: STANLEY WILLIAM
Filed: 1902-08-27
Granted: 1902-10-23
Abstract: 18,858. Stanley, W. Aug. 27. Energy meters.-Forces are periodically set up equal and opposite to those exerted by the movable part of a watt-meter, and proportional movements producing or subsequently produced by the forces are integrated. In one form, Fig. 1, the pressure coil B of a dynamometer can deflect to a small extent against a stop C', and close a circuit through this, short-circuiting one of two oppositely-wound coils on an electromagnet 0, to which a regular intermittent current is supplied. The electromagnet 0 then oscillates an armature N, with a pawl, to drive a ratchet-wheel G, which carries springs E controlling the movable coil B. The springs are thus wound up until they cause the coil to leave the stop C<1>, whereupon the wheel G becomes stationary, reverse movement being prevented by a detent H. Another pawl on the armature N drives a registering-gear X. A second electromagnet M, also carrying the intermittent current, continually oscillates an armature L with a pawl to rotate a ratchet-wheel and a shaft I. A cam on this shaft periodically disengages the detent H for a short time from the wheel G, so that the springs E return the wheel to its original position ; at the same time projections on the shaft I shortcircuit the pressure coil B and the magnet 0 to stop their operation temporarily. When this short-circuit ceases, and the detent H is again applied to the wheel G, all the movements are repeated. The coils of the electromagnets 0, M, the pressure coil B, a solenoid U, and a resistance, are all connected in series between the supply mains ; the intermittent current in the magnet coils is obtained by a contact device, operated by the solenoid U, and shown in Fig. 5, short-circuiting them regularly. The stationary solenoid U surrounds an iron shaft, controlled by a spring, and carrying an inertia disc. The iron shaft carries an iron disc S<1> near one end, and a transverse armature p near the other, within a stationary iron frame S. A projection V on the iron shaft makes contact with a pivoted U-shaped piece W. In another construction of meter, Fig. 9, the pressure coil 2 of the dynamometer is regularly shortcircuited, and carries a pawl 6, which drives a ratchet-disc 7, on a shaft controlled by springs 9, until the action of the coil is balanced by that of the springs, reverse movement of the disc 7 being prevented by a stationary pawl. The springs 9 are carried by an aligning shaft 11, held stationary by a detent 16 while the springs are wound up. Periodically two cams on a rotating shaft 18 apply a detent 14 to the upper shaft and withdraw the detent 16, so that the springs drive the lower shaft 11 and a counting-gear until they are completely run down. The cam shaft 18 is driven by a ratchet-gear 28 from a shaft 21 in the shortcircuiting device. In this device, the shaft 21 carries a transverse electromagnet 20 within a stationary iron frame 22 ; an eccentric pin on the shaft 21 oscillates a switch between two springs, contact with either of which short-circuits the electromagnet 20 and the pressure coil 2.