Patent GB-190707367-A (GB)
Title: Improvements in or relating to Gas Lighting Apparatus.
Inventor: BROADBERRY ARTHUR EDWARD
Filed: 1907-03-27
Granted: 1908-02-20
Abstract: 7367. Broadberry, A. E. March 27. Lighting and extinguishing gas.-A gas lighting and extinguishing apparatus, of the type in which the actuation is effected by suddenly increasing the pressure, is formed with two chambers containing a liquid and having a rigid wall between them, or each connected to a separate liquid chamber, and a sudden increase of the gas pressure is adapted to cause an unequal flow in the chambers and through floats &c., so as to operate the gas cock. In the preferred form, Figs. 1 and 2, the gas main 3 is connected by a pipe 4 to the lower of two chambers 1, 2, which are connected by a pipe 5 and by a passage 7 provided with a contracted or contractable opening 8 adapted to retard the flow of liquid such as glycerine, water, &c. which is contained in the vessel 1. A float 9 in the vessel is connected by a rod 12 to a lever 16, and a float 10 in the vessel 2 is hinged to a lever 1 of a link system 13, 16, 18, 19, 20, which raises or lowers a screw stop 22 actuating a spring or gravity controlled piston valve 23, which normally connects a chamber 26, Fig. 2, provided with a diaphragm 29 to the air. On a sudden increase of the gas pressure, the float 9 is depressed, and liquid is forced from the chamber 1 to the chamber 2 and raises the float 10, which assists in raising the stop 22. The valve 23 is thereby raised, and is caused to connect a pipe 25 connected to the main 3 to a pipe 27 connected to the chamber 26, and the diaphragm 29 is raised, thereby operating a ratchet 35 on the gas cock by means of rods 30, 31, a lever 32, and a pawl 34. The gas is thus turned on or off. The levels of the liquid in the float 10 and the chamber 2 then become equalized by water passing through the opening 38, and the floats resume their normal positions, so that the stop 22.returns to its original position. A gradual increase in pressure is insufficient to operate the valve 23. In a modification, Fig. 3, the chambers 1, 2 are separated by a wall with apertures 8, 46 for allowing water and gas respectively to pass through. The float 9 carries a liquid seal for the end 45 of the tube 27 connected to the diaphragm 29. The increase of pressure depresses the water in the chamber 1, and the float falls, allowing the tube 27 to connect to the main and thereby operating the gas cock. As gas passes into the chamber 2, the original position of the valve 45 is established. The liquid-seal valve may in this form be replaced by another valve. In a further modification, the gas main is connected to a chamber 47, Fig. 5, connected to the two chambers 1, 2 by passages 49, 48, the latter being controlled by a screw valve 50. On the increase of pressure, water rises in the chamber 1 more rapidly than in the chamber 2, and the movement of the float 9 is transmitted by means of a cord 51 of a counterweighted pulley system connected also to the float 10, and a rod is raised which actuates a valve 23 similar to that shown in Fig. 1. In a further modification, the chamber 47 is connected to two chambers arranged side by side and connected by an apertured wall. Each chamber contains a float, and as the increase of gas pressure forces liquid into the chambers, a float on the first chamber is first raised and a hinged vessel, carried by the two floats, is tilted so as to open the mercury seal, made with a pipe connected to the tube 27 and dipping into the vessel. As shown in Fig. 11, the chambers 1, 2 form a bell which floats in a chamber 47. The sudden increase of pressure causes the bell to rise, and a rod 20 on the bell actuates a valve 23. Gradual increases of pressure force water into the chamber 2 without raising the bell. The diaphragm 29 may be dispensed with, and the rod 30 actuated directly from the rising and falling flats ; or the pipe 27 may be connected directly to the burner and the valve 23 may be alternately supported and released by the action of the floats. The mechanism may operate an electric switch for actuating the gas tap or for lighting the gas by an electric spark. An aneroid or bellows may be used instead of the diaphragm 29. According to the Provisional Specification, the two chambers may be connec'ed by a flexible diaphragm, and the gas have free access to one side and constricted access to the other side of the diaphragm, the movements of the diaphragm being transferred to a valve.