Patent GB-191505799-A (GB)
Title: Improvements in Means for Controlling the Movement of One Object in Accordance with the Movement of Another Object.
Inventor: TUGWOOD RICHARD JOHN
Filed: 1915-04-17
Abstract: 5799. Tugwood, R. J., [Andersen, F.]. April 17. Hunting switches.-Relates to apparatus for controlling the movement of one object in accordance with the movement of another of the hunting- switch kind, in which the movement of the controlling arm or switch in a certain direction relatively to the object under'control serves to actuate an electric relay for cutting in the means for driving the controlled object in the same direction, this movement ceasing when the original relative position of the controlling-arm and the controlled object is restored. The invention consists in arranging for the controlling-arm to move through a predetermined distance before the driving- means is cut in, the driving-means being cut out as before when the original relative position is restored. This obviates the frequent starting and stopping movements of the driving-means. The invention is particularly adap'ed for use with the automatic sighting and gun - laying system described in Specification 10,275/12, [Class 92 (ii), Ordnance]. Fig. 2 shows means for controlling a gun 2 by operating a sight 1. The arm 34 carried by the sight is shown bridging, and in mid-position with respect to, a continuous contact 16 and a sectional contact 19, 21, 20, both contacts being carried by a disk 4 moving with the gun 2. When the arm 34 is moved by worm gear 3 to the right or left of the insulated gap 18, relays 15, 14 are respectively brought into operation, and these, through electro-magnetic clutches 11, 10 and reversing-gearing 6, 7, 8, cause a continuously running motor 9 to move the disk 4 until the arm 34 again registers with the gap 18, whereupon the movement of the gun ceases. The characteristic feature of the invention is in arranging the contacts 19, 21, 20 on each side of the gap so that, although the relays 14, 15 are not brought into operation to start the motor until the contact 20 is reached, these relays are not cut out until the contact 19 is reached by the corresponding movement of the disk 4. In the form shown in Fig. 2, this is effected by means of solenoids 28, 38, 48 energized in turn as the arm 34 moves away from the gap on to contacts 19, 21, 20, so as to attract the contact arms 36, 39, 47 and switch in one of the relays 14, 15 when the contact 20 is reached. The electric connexions are such that, as the arm 34 moves with respect to the contacts in the reverse direction, the solenoids 38, 48 remain energized so long as the contact arm 36 is closed, that is until the contact 19 is reached. Fig. 3 shows a modified arrangement in which the arm 34 is spring pressed towards the contact bars 16, 17, an adjustable tapered member 53 having a gap 54 being arranged to hold the arm away from the contacts during the movement of the arm to right or left of the gap. During the return movement, the arm 34 moves on the contacts and below the member 53 until the gap 54 is reached, whereupon it is moved away from the contacts by a pivoted finger 51 entering a gap 52 in the disk 4 as shown in Fig. 6.