Patent GB-191015741-A (GB)
Title: Improvements in Apparatus, Controllable from a Distance, for Automatically Operating Gas Burners.
Inventor: ROBSON GEORGE
IPC: F23Q21/00
Filed: 1910-06-30
Granted: 1911-06-21
Abstract: 15,741. Robson, G. June 30. Valves controlled from a distance.-Relates to improvements in apparatus, controllable from a single point or station, for automatically operating gas-burners, of the type wherein the movement of an expansible device under the pressure of the gas mains controls a clockwork motor for operating a gas cock through the medium of two overlapping weights, one of which may be rendered inactive when required to vary the load. The invention is more particularly applicable to the arrangements described in Specifications 7434/09 and 14,681/10, and the improvements chiefly consist in various forms of cam-disks for actuating the gas-valve and for rendering one of the overlapping weights inoperative. Figs. 1 and 3 show the arrangement described in Specification 7434/09, in which a diaphragm b expands when the gas pressure in the mains is raised sufficiently to actuate overlapping levers c, 5, pivoted at e, 6. By means of an arm d and pawl f on the lever c, the lever g is lifted to release the pin u on the escapement shaft t of the clock-work mechanism. The clock-work motor rotates, but is stopped by the pin c<1> engaging the pin t<1>. When the pressure is reduced, the pin c' is withdrawn, and the clockwork motor is free to operate. The disk z on the shaft is then rotated, and, by means of a crank-pin 2, actuates the gas-cock 3. To extinguish at a lower pressure than necessary for lighting, the disk z has cams 9, each of which, by bearing against the arm 8 of the lever 5, prevents it from acting on the diaphragm during the process of extinguishing. The apparatus described in Specification 14,681/10 works with a rise of pressure only, the pin c<1> being removed. In the present invention, the disk 14, Figs. 11 and 12, is formed with a continuous ridge 15. By this arrangement, the diaphragm expands sufficiently to pick up both weighted levers at lighting-pressure, but, when extinguishing occurs at a lower gas pressure, the diaphragm has only to expand against the weighted lever c, Figs. 1 and 3. The pawl f therefore cannot sink to engaging position under the arm for a fresh cycle until the pressure is reduced sufficiently below the pressure required for extinguishing, thereby preventing the apparatus from being prematurely started. An operating-disk is also described with the ridge but without the cams 16. In a further modification, lighting and extinguishing are effected at the same pressure by the use of a plain disk without ridge or cams. By arranging the valve-operating pin 2 between the cams 9, as shown in Fig. 9, one of the cams will be in operation, lifting off the loose weighted lever 5 when lighting is being effected, so that the diaphragm expands against both weights at extinguishing. In a further modification, shown in Fig. 15, the disk 17 is formed with high peaks 18, as described in the above-mentioned Specifications, and with low peaks 19, serving the same purpose as the ridge on the disk 14, Fig. 11, the peaks 18 returning abruptly to the disk on one side. By this arrangement, the lower locking-pin c', Fig. 1, is prevented from stopping the clock-work mechanism, so that a rise of pressure only is required for extinguishing. Part of the load of the levers c, 5 may be placed on the arm g.