Patent GB-438535-A (GB)
Title: Electrically operated relay having a combined vibrating member and servo-motor
IPC: H01H51/32
Filed: 1934-06-23
Abstract: 438,535. Electromagnetic switches. COMPAGNIE POUR LA FABRICATION DES COMPTEURS ET MATERIEL D'USINES A GAZ, 12, Place des Etats-Unis, Montrouge, Seine, France. June 23, 1934, No. 18631. Convention date, June 28, 1933. [Class 38 (v)] [See also Group XXXVIII] An electrically-operated relay, adapted to be operated by superimposed frequency comprises a vibrating element sensitive to the superimposed current which is adapted to restore the controlled member or members to a predetermined starting position, in combination with a servomotor adapted to be brought into action by the vibrating element to operate the controlled member or members and thereby cause them to take up a predetermined position or positions. As shown in the Figure, the vibrating element comprises a tuned reed 8 controlled by a tuned winding 5 to step round a ratchet wheel 10 by means of a pawl 9. The ratchet wheel 10 is fastened to one wheel 11 of a differential, the satellite pinion 13 of which is connected to a shaft 32 through gearing 14, 15 during the rotation of which a pivoted detent 37 engages a lever 29 which through a link 28 rocks a shaft 23 to disengage gears 24, 25. This action frees the shaft 54 which is then returned to its starting position by a spring 57, in which position the pin 63 engages the stop 64. The shaft 32 continues to turn, however, until the pin 34 on the disc 33 engages the fixed pin 36 in which position the arm 37 has released the arm 29 and pinions 24, 25 are again in engagement. In this position the shaft 32 is momentarily locked as is also the initial shaft carrying the arm 13 of the satellite pinion of the differential gear so that the other planet wheel 16 is driven in the reverse direction. The cam wheel 42 carried by the shaft 32 has, however, been driven so that it engages a pin 45 and rocks the lever 43 about a pivot 44. Thus, contacts 49, 53 in the circuit of the servomotor 18 are closed and the motor commences to rotate, the beak 49 of the contact lever 47 being raised out of the notch 60. The motor drives the wheel 16 through a ratchet 71 so that this wheel is moved rapidly by the added velocities imparted through the differential gearing and the servomotor, the ratchet 71 acting as a freewheel drive. At the end of the emission of current impulses, the planet wheel 11 stops and the shaft 32 is then driven in the reverse direction by the planet wheel 16 which is still rotated by the motor 18. In returning, the detent 37 passes the arm 29 freely without causing the disengagement of the gears 24, 25. The cam 42 is also returned to its initial position. The contacts 49, 53 in the motor circuit are not, however, separated until the beak 50 engages the notch 60 in the wheel 59. At this time a cam 68 on the extended portion of the shaft 54 engages and closes contacts 65 in the controlled circuit. If, however, the emission of the control current is for a longer period, the beak 50 falls in to a notch 61 causing cam 69 to close contacts 66 and for a still longer period cam 70 engages and closes contacts 67 at the end of the movement.