Patent GB-152045-A (GB)
Title: Improvements in and relating to telemotors
IPC: B63H25/34
Filed: 1919-04-01
Abstract: 152,045. Alexander, A. E., (Benson Electric Co.). April 1, 1919. Systems controlling travel for a fixed distance or number of revolutions.-Relates to electric telemotors for operating the steering gear of ships. An electric contact 2 is connected by a wire 4 to a generator 5. A movable conductor 6 is adapted to make contact with any one of a number of insulated studs 7 which are connected by wires 7<a> to other insulated studs 7<b> outside the casing 1. The lower ends of the studs 7b make contact with a sliding bar 9, 10 interrupted at the middle by an insulating piece 11. The bar 9 is in permanent contact with the stud 9<a> which is connected by a wire 14, E to the other pole of the generator. The relay coil 14<a> is therefore included in the normally open circuit 4, 2, 6, 7, 7a, 7<b>, 9, 9<a>, 14, 14<a> E, 5. Similarly, the relay coil 15<a> is included in another normally open circuit 4, 2, 6, 7, 7<a>, 7<b>, 10, 10<a>, 15, 15a, E, 5. One pole of an electric motor 16 is connected by means of a normally open contact 17 to one pole of the generator, and the other poles of the motor and generator are connected by means of a normally closed contact 18. The first pole of the motor armature is connected also to the negative pole of the generator by a normally open contact 19, and the second motor armature pole to the positive pole of the generator by a normally closed contact 20. The contacts 17, 19 and 18, 20, are also connected by wires A, B as shown. The motor field 21 is connected to the wires A, E as shown. The plate 12 carrying the insulated bars 9, 10 is reciprocated by any suitable mechanism from the motor such as a screw and nut 22, 23, belt 24, shaft 26, and gears 27, 28. When the apparatus is used for actuating the valve of a steam steering engine, the valve 40 is connected to the motor through links 39, 37, rod 36, and gears 30, 29. The steering engine may be omitted and the rudder operated by mechanical gear from the motor shaft. The conductor 6 is insulated by a member 6<e> and carries an operating handle 6f. When the handle is in mid-position and also the bar 9, 10, no current will flow since the mid-contact 7b is insulated by the member 11. When the conductor is placed in contact with one of the studs 7 to the left, the circuit 4, 2, 6, 7, 7<a>, 7<b>, 9, 9<a>, 14, 14a, E, 5, is completed, the coil 14<a> is energized and operates the armature 17<a> to close the contact 17 and open the contact 20. Current will now flow through the field 21 and wire E, and also through the contact 17, armature 16 and contact 18 so that the motor is started. The plate 12 is therefore moved to the left until the contact bar 9 is withdrawn from the stud 7<b> which is in use, and the stud thereby insulated and the circuit opened. The apparatus then stops, and is only re-started by moving the conductor 6 on to another stud. The plate 12, motor 16, and the rudder are so geared that the rudder comes to a stop at the same angle as the conductor 6. A movement of the conductor 6 to the right causes a reverse rotation of the motor in a similar manner.