Patent GB-191113574-A (GB)
Title: Improvements in Remote-controlling Apparatus for Electrically Actuated Travelling Winches and the like.
Inventor: BLEICHERT MAX ADOLF
IPC: H02P1/54
Filed: 1911-06-06
Granted: 1912-06-06
Abstract: 13,574. Bleichert, M. A., and Bleichert, M. P. June 6. Systems of controlling travel for a fixed number of revolutions; controllers, drum ; controllers, actuating - mechanism and indicating- devices for.-In the remote control of motors driving electric travelling winches, the operation of the starter varies the resistance in a circuit passing through a meter, so that the position of the starter can be gauged. In one form, the motors n, o, Fig. 1, are supplied through the controller a from a line p, which is in turn supplied from a control switch z. A key switch d sends pulsations of current through a solenoid b to actuate the controller step by step, and a key h completes, through a resistance i, a circuit through a measuring-instrument k. Thestrength of the current through the meter depends upon the amount of resistance f short-circuited by the drum e, which moves with the controller a. The resistance i suitably reduces the current in the meter circuit and prevents the closure of the switch h from actuating the controller. A separate source of current, for example a battery, may supply the meter circuit, or both it and the actuating-circuit. A rotary motor q, Fig. 4, may be used to drive the controller, and the actuating-circuit is completed through the meter k when the arm z is placed on the contact 2. When the controller has been moved to the desired position, as ascertained by the reduced metering-current fed through the resistance i when the arm is on the contact 1, the motors n, o may be supplied by moving the arm over on to the contacts 3-7. Instead of driving the controller by a motor, a solenoid and pawl may be employed, the circuit of the solenoid being automatically made and broken, and a resistance the equivalent of that of the solenoid, introduced when the solenoid is cut out. One operation in hoisting may be prepared for while another is being completed. To effect this, the drum e, Fig. 6, that is driven by the motor q compresses in its rotation a spring w arranged circularly between an abutment x on the drum e and an abutment y on the drum a. During the time the motors n, o are being supplied with current, a series brake magnet t locks the drum a against rotation and the spring w is compressed. Upon de-energization of the magnet, the drum a is rotated by the spring to a distance determined by the position of the abutment x. In a further modification, a number of electro - magnetic switches are employed, each actuated successively, adjacent switches being mechanically and electrically interlocked. The resistance of the meter circuit is varied as each successive switch is actuated, giving an indication of the particular switch in the sequence that is operative. In another arrangement, the meter circuit includes a coil b<1>, Fig. 8, in series with the variable resistance f. On moving the lever z on to the contact 1, the meter gives a reading and the core of the coil b<1> connects the motor q at r<3> in a circuit including a key h. The controller having been moved to the desired position by closing the key, the switch arm z is then moved off the contact 1, de-energizing the coil b<1>, cutting out the motor q, and completing the circuit of the working motors at r<2>. Current is then supplied to these motors as the arm z moves over the contacts 2-6. The invention is shown in Fig. 9 as applied to the operation of a controller e in synchronism with the operation of a pilot drum a<1>. When both drums are similarly situated, the current supplied from a stud 8 flows equipotentially down both sets of resistances f, f<1> to studs 10, 10'. These are connected through an actuating-coil b<2> and a locking coil b<1> respectively to the terminals of a meter k. If, owing to displacement of one of the drums, the balance is upset, the locking-coil prevents further movement of the control arm z, and the coil b<2> breaks the circuit of the motors n, o at r<2>, and at r<1> makes the circuit of the actuating-coil b of the controller. On re-establishment of equilibrium, the switch r<2> is re-closed by a spring and the motors n, o again put in circuit.