Patent GB-479725-A (GB)
Title: An improved electrically operated resonance device for the control of definite operations
IPC: H01H51/32
Filed: 1937-05-25
Abstract: 479,725. Supply meters. LANDIS & GYR AKT.-GES. May 25, 1937, No. 14481. Convention date, June 18, 1936. [Class 37] [Also in Groups XXXVII and XXXVIII] A controlling device for changing the multiple tariff mechanism in meters or for operating switches &c. has two resonance spring driving gears alternately actuated by control currents of different frequencies and each effecting one definite operation. These gears, in addition to the alternating drive of the actuating mechanism that effects the two operations also actuate a controlling device so as to couple the actuating mechanism to the resonance gear tuned to the frequency of the controlling current and to uncouple the other resonance gear. As shown in Fig. 2 resonance springs 1, 3 tuned to the frequencies of the two controlling currents drive toothed wheels 2, 4 carrying eccentrics 6, 9 displaced 180‹ from each other and also toothed wheels 7, 10 driving the sun-wheels 12, 15 of a planetary gear 13. The eccentrics 6, 9 actuate levers 26, 27 which reciprocate pawl levers 28, 29 which engage ratchet-wheels 31, 32 mounted on a controlling shaft 30. The ratchetwheels 31, 32 have teeth over only half of their periphery and are set at 180‹ to one another. On the shaft 30 is also mounted a cam 33 which effects the operations to be performed. On the planet-wheel shaft 19 are mounted eccentrics 20, 21 set at 180‹ to one another and a member 22 with projections 23, 24 engaging a fixed stop 25, so that the rotation of the shaft 19 is limited to 180‹ in each direction. In the position shown, the pawl lever 28 is raised from the ratchet-wheel 31, the pawl lever 29 being in the operative position. When the spring 1 is vibrated by impulses of its own frequency the wheel 2 drives the sunwheel 12 and thereby rotates the planet-wheel shaft 19 through half a revolution, when its motion is arrested by the engagement of the projection 24 with the abutment 25. In this position the eccentrics 20, 21 lift the pawl lever 29 out of engagement with the ratchet wheel 32 and lower the pawl lever 28 into operative position, so that the ratchet-wheel 31 with the shaft 30 and cam 33 are rotated through half a revolution, after which the pawl rides idly on the plain part of the circumference until the operating impulses cease. On subsequent energization of the resonance spring 3, the shaft 19 is turned back into the position shown so that the ratchet-wheel 32, which has been turned through 180‹, is driven by the pawl lever 29. In a modification, Fig. 3, the wheel 2 driven by the resonance spring 1 is rigidly connected to a screw spindle 36. The wheel 4, driven by the resonance spring 3 is loosely mounted on the shaft 37 and carries a pin 40 passing through an aperture in a nut 39 which effects the lifting and lowering of the pawl levers 28, 29 by means of bell-crank levers 45, 46. In a further modification, Fig. 5, the wheels 2, 4 carry pins 56, 55 which engage slots in pawls 54, 53 pivoted on a disc 66. The wheel 4 that is being driven by its spring 3 moves the corresponding pawl 53 into engagement with a star-wheel 58 mounted on a shaft 57 which carries prisms 60, 61 by means of which the pawl lever 28 is lifted out of engagement with its ratchet-wheel 31 and the lever 29 is lowered into operative position to drive the ratchet-wheel 32. Energization of the spring 1 drives the wheel which moves the pawl 54 into operative position in which it drives a star-wheel 59 on the shaft 57, thereby lifting the pawl lever 29 and lowering the lever 28 into engagement.