Patent GB-191029378-A (GB)
Title: Improvements in and relating to Apparatus for Electrically Controlling Mechanism at a Distance.
Inventor: LOHAY CHARLES GEORGES
IPC: G05D3/12
Filed: 1910-12-17
Granted: 1911-06-08
Abstract: 29,378. Lohay, C. G. Dec. 17. [Addition to 14,431/08.] Mechanically - tripped switches.-Relates to switches for use in a motor control system of the kind described in the parent Specification. A setting - handle operates the contacts of the controlling- switch and also latches its " throw-off " spring. Another handle advances the whole switch a predetermined distance away from a tripping-cam, which is driven by a motor and spur gearing to follow after the switch and trip it open after the predetermined movement of the motor. In the arrangement shown in Fig. 2, switches are provided for controlling two distant motors. The contact-ring k is connected to the source of supply and to a spring-controlled contact-bar through a bridge-piece 14, 15, 14. The bar is normally pressed into contact with the contacts 18 by means of a spring 17, Figs. 5 and 9, and is moved out of engagement with these contacts against the action of the spring 17 by means of a projection 25 mounted on a spindle 24, the projection engaging an insulating bracket 16 arranged to slide inside the bridge-piece 14, 15, 14. The rod 24 also carries a projection 26 arranged to engage a sliding piece 19 provided with a projection 20. The bridge-piece 14, 15, 14 is mounted upon an insulating frame 9, which carries conducting frames 10, 11 connected to conducting-rings q, r by means of spring contacts 12, 13 respectively. The rings q, r are connected directly to the motors or to an electro-magnetic reverser. The rod 24 carrying the movable elements of the switches is revolved about the spindle 2 by means of spur-wheels 61, 62, pinions 63, 64, and a hand-wheel 66. The operation of the arrangement is as follows.-The shaft 24 is lowered against the action of a spring 68 and held in its lowered position by means of a pusher 69 and snug 70 moving in a right-angled slot 71. The contact-bar is thereby separated from the contacts 18, and the projection 20 of the sliding piece 19 forces the head 56 out against the action of a spring by means of the projection 26. One end 59 of the bell-crank lever 58, 59 engages the head 56 by the action of a spring 60. The shaft 24 is then revolved in an anti-clockwise direction by rotating the wheel 66, and, when the desired movement has been made, the pusher 69 is released, thereby allowing the bar to complete the circuit of the motor or reverser through the contact-ring k, bridge 14, 15, 14, bar j, contacts 18, n, o frame 10, and contactring q. The motors then operate the mechanism to be controlled, and motor X operates, through bevel gearing 35, 29, the wheels 29 carrying tappets 3, which trip the bell-crank levers 58, 59 after the motors have made the pre-determined number of revolutions, thereby allowing the springs acting upon the plungers 55 to separate the bar j and contacts 18 through the sliding members 16, 19. When the rod 24 is depressed, one of the spring-controlled pawls 75, 76, Fig. 4, holds the contacts n, o or n<1>, p together. When the rod 24 is moved in a clockwise direction, the current through the motors or reverser is reversed, the circuit being as follows:-Ring k, bridge 14, 15, 14, bar j, contacts 18, n<1>, p, frame 11, contact-ring q. Make-and-break switches, mechanical.-The current to the coil of an electro-magnetic escapement controlling the motor X at the transmitting station is rendered intermittent by means of a switch operated from the motor of the controlled station. The fixed contacts x, z, Fig. 12, are mounted on a frame d<1>, and the movable contact is carried upon a bar 77 arranged to oscillate between rollers 78. The other end is connected to bell-crank levers 80, the free ends of which enclose a pin 82 mounted on a pivoted lever 83. The pin 82 is reciprocated in the slot d<2> by means of a cam-shaped revolving disk s, the movement of the pin 82 being transmitted to the rod 77 through one of the bell-crank levers 80.