Patent GB-1027543-A (GB)
Title: Improved feed device for a gas heating appliance
IPC: F23D14/64
Filed: 1963-01-25
Abstract: 1,027,543. Gas burners. ACIDE CARBONIQUE PUR. Jan. 23, 1963 [Jan. 26. 1962; May 18, 1962], No. 3290/63. Heading F4T. A gas burner comprises three injectors 6, 7, 8 for different gas flows mounted on a support 1 which is slidable on a fixed slide 2 so that any one of the injectors can be aligned with gas supply ports 4 in the fixed slide. A seal 5 is provided on either side of the ports 4 between the fixed slide 2 and the slidable support 1. Gas is supplied to the fixed slide by an inlet 3. The slidable support 1 is moved by means of a cable 14 within a sheath 15, and a spring 11 urges the support 1 against a stop 18, mounted on a spring blade 28, the injector 7 corresponding to normal flow being then in the operational position. When a handle 19 is turned clockwise the cable 14 is pulled and the large flow injector 6 is brought into operation. A device for locking the lever in this position may be provided. To bring the low flow injector 8 into operation the handle 19 is turned anti-clockwise to act on a second cable 24 acting on a cam 27 which raises the stop 18 so that the spring 17 moves the slidable support 1 to the left until stopped by a fixed stop 32. A fourth position of the slidable support 1 is defined by a second stop 29 mounted on the spring blade 28 and in this position the gas supply ports 4 are closed by a solid part of the slidable support 1. The normal injector 7 and the low rate injector 8 are surrounded by cylindrical walls 34 but the large flow injector 6 is only partly surrounded by a cylindrical wall. A tell-tale device 9 is fed in parallel with the large flow injector 6. In a modified arrangement for moving the slidable support the control cable can transmit either a push or a pull and the return spring 17 only acts on the slidable support when the large flow injector is in operation. The end of the control cable 14 is fixed to a component 38, Fig. 6, which can slide in a guide 39 and has a pin 42 engaged in a slot 43 of a lever 44 mounted on a pivot 45 and articulated round a spindle 46 so that it can be raised to disengage a nipple 47 on the lever from recesses 48 . . . 50 in a fixed plate 52. When the nipple is in the recess 50 the normal injector 7 is in operation; when the nipple is in the recess 48 the low rate injector 8 is in operation; and when the nipple is in the recess 49 the gas supply ports 4 are closed by a solid part of the slidable injector support 1. In order to bring the large flow injector 6 into operation the lever is held against a stop 51 on the fixed plate 52 against the action of the return spring 17 of the injector support 1. A device for locking the lever in this position may be provided. In a modification of the apparatus shown in Fig. 6 the lever carries a pinion which engages a rack to which the end of the control cable is secured. In a simplified construction, Fig. 8 (not shown), the burner comprises only a large flow injector and a normal flow injector and the slidable injector support is moved by pulling on an extension thereof. A return spring acting on the injector support urges the latter against a fixed stop. The burner may comprise a catalytic layer or a refractory ceramic wall. The control cables may be replaced by rods.