Patent GB-152046-A (GB)
Title: Improvements in and relating to telemotors
IPC: B63H25/34
Filed: 1919-04-01
Abstract: 152,046. 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. The controller box 1, Fig. 2, contains two insulated collector-bar contacts 2, 3 and a series of insulated contact studs 6<b>, Fig. 1. A rotary conductor 10 is adapted to make contact between the members 2 3, 6, and is insulated from the casing by a sleeve 10<a>. A plate 13 insulated from and pivoted on the same axis carries a contact pin 14 insulated therefrom, and connected by a wire 14<b> with a stud 14<a>, insulated from and carried by the conductor 10, but adapted to contact with the conductor 3. When the conductor 10 makes contact with the pin 14, the circuit 2, 10, 14, 14<b>, 14<a>, 3 is completed. A further movement of the member 10 in the same direction carries the plate 13 with it, while in the reverse direction the member 10 bears against the pin 15 and carries the point 14 with it with a slight lag. The bar 2 is connected by a wire 17 to a generator 18. The bar 3 is connected to the opposite pole of the generator by a wire 19 through a relay coil 19<a>. The studs 6<b> are connected by wires 6<a> to the contacts 6 and are in contact with an insulated bar 21 adapted to slide either to right or left. An insulation pad is fixed in the upper surface of the bar 21 so that a selected contact 6<b> is insulated from the bar. The bar is carried on a plate 22 which is adapted to be moved horizontally by the nut 22<a> and worm 25. The screw is driven by an electric motor A through the gearing 30, 29, 28, 27, 26. The slider 21 is always in contact with the stud 31 which is connected through the relay coil 31<b> to the generator 18. The armature of the relav 31<b> controls a normally open contact 35 in a wire 36 which is connected to points 37, 38, of normally open and normally closea contacts respectively, which contacts are controlled by the armature 39 of the relay coil 19<a>. The point 38 is connected through the point 38<a> and wire 38<b> with one pole of the motor A, and the point 40 of a normally closed contact is connected by wire 40<a> with the other pole of the motor. The opposing point 40b of the contact is carried by the armature 39 and is connected to the generator by wires 40<c> and 19. The normally open contact 37 is opposed by a stationary contact point 41 which is connected by wires 41<a>, 40<a> to the motor. The other pole of the motor is connected by wires 38b, 42<a> to a stationary point 42 of a normally open contact, the opposing point 43 of which is carried by the armature 39 and is connected b wires 40<c> and 19 to the negative pole of the generator. The motor is connected by gearing 30, 29, 44, 45, screw 46, nut 47<a>, rod 48, beam 49 and link 50 with any desired mechanism to be operated such as the valve 52 of an engine; or the screw 46 may be connected to a steering gear. If the con. ductor 10 is between the contact 14 and stop 15 and over the central one of the contacts 6, then the insulation pad in the centre of the rod 21 prevents any flow of current. If the conductor 10 is moved towards the stop 15 and into contact with the next point 6, the circuit 18, 3, 10, 6, 6<b>, 21, 31, 31<b> is completed and the armature 32 raised to bridge the contacts 33, 35. This completes the circuit 18, 33, 35, 38, 38<a>, A, 40, 40<b>, 18. The motor A thus rotates and moves the bar 21 until the selected contact 6<b> is insulated by the insulation pad and the circuit opened, when the armature 32 will fall and open the motor circuit. The operation may be repeated by moving the conductor 10 to another contact point 6. When the conductor 10 is moved in the opposite direction it contacts with the point 14 and closes the circuit 18, 2, 10, 14, 14<b>, 14a, 3, 19<a>, 18. The relay coil 19<a> operates its armature, which thus connects the points 37 to 41 and 43 to 42. Further movement of the conductor 10 into contact with a point 6 closes a circuit as before and lifts the armature 32 and connects the points 33-35. The current through the motor is now reversed, but the return of the parts to equilibrium is the same.