Patent GB-704049-A (GB)
Title: Automatic ignition device for a plurality of gas-burners
IPC: F24C3/10
Filed: 1952-02-15
Abstract: 704,049. Gas burner Ignition devices. ECKERLE, O., and SCHUMACHER, E. Feb. 15, 1952 [Feb. 15, 1951], No. 4098/52. Class 73 (3) In an ignition device for a plurality of burners in which the opening of a burner gas tap actuates an electromagnet common to all the burners so as to produce a spark to ignite a particular burner a gas tap actuating element is movable against a spring action from a locked position to an operative position and is rigidly connected with a coupling means and an electric contact so that the coupling means engage an electromagnet actuating means and the electric contact completes a circuit between the electromagnet and the spark gap of the particular burner when the actuating element is in the operative position. A gas tap actuating element 3 is pressed inwardly to complete a circuit from a coil 17 of an electromagnet 6 through a wire 5 and contact discs 4, 7 to an electrode 11 and is then rotated in an anti-clockwise direction to move an iron core 15 against the action of a spring 16 outwardly of the electromagnet 6 by means of a member 12, attached to the disc 3, engaging a recess 13 in a rod 14. The core 15 is pulled rapidly into the coil 17 by the spring 16 as soon as the member 12 is moved out of engagement with the recess 13 to create a spark between the electrode 11 and the burner 10. In a modification shown in Figs. 5, 7, 9 and 10 a gas tap actuating element 19 on being pressed inwardly completes a circuit from the electromagnet coil to a burner electrode through an annular contact member 20 and contacts 22, 21 and at the same time moves a shaft 18 axially against the action of a spring 53 ; the shaft 18 carries a projection 23 which normally engages a recess 28 in a spring biassed lever 27, located in a chamber 24, to prevent rotation of the element 19. The projection 23, as the shaft 18 is pressed inwardly, passes through a groove 32, radially extending from an orifice 30, Fig. 10, in a wall 29 forming a partition between chambers 24, 25, and engages a slot 36 or 37 in a cam 34 freely mounted on the shaft 18 and located in the chamber 25. The cam 34 normally locked in position by a plunger 35 engaging a recess 38 or 39 is rotated to lift the plunger 35, which plunger through a lever 45 and a lever 47, Fig. 11 (not shown) mounted on a shaft 46 axially displaces the core of the electromagnet; a gas valve 51 being opened at the same time by the shaft 18 through a shaft 54. The plunger 35 drops into one of the recesses 38, 39 after the cam 34 has been rotated 180 degrees to enable the core of the electromagnet to be returned by a spring, Fig. 11 (not shown), at high speed to its normal position to create a spark between the burner electrode and the burner. The plunger 35 on dropping into one of the recesses 38, 39 prevents reverse rotation of the shaft 18 and, Fig. 6 (not shown), a projection formed on the shaft 18 abuts a stop mounted on the outer wall of the casing and so prevents forward rotation of the shaft 18. The shaft 18 can now only be slid outwardly to its normal inoperative position in which position it can be rotated to regulate the gas flow until locked by the projection 23 engaging the recess 28 in the lever 27. In a further modification shown in Figs. 13, 15, 16, 17 and 18 an arcuate member 58 carried by a gas tap actuating member 57 mounted on a shaft 56 engages, when moved axially forward, contacts 59, 60 to complete the circuit between the electromagnet and the burner electrode. A cam 61 also mounted on the shaft 56 co-operates with a projection 65 on the side of a pivoted lever 62 so that on rotation of the shaft the upper end of the lever 62 engages the side of a recess 63 to move an electromagnet core operating rod 64. The cam 61 and projection 65 are shaped so as to permit the rapid return of the electromagnet core but to prevent reverse rotation of the shaft 56. In the normal safety locked position a segment 71 mounted on the end of the shaft 56 engages a spring 72, Fig. 17, to prevent rotation of the shaft 56 but to allow axial movement thereof. The shaft 56 on being pressed inwardly against the action of a spring 81 moves the segment 71 through a recess 69 in a wall 68 into the operative position. Stops 75, 76 formed by an arcuate collar 74 mounted on a surface 73 co-operate with the segment 71 to limit rotation of shaft 56 when in the operative position. The shaft 56 after being rotated to operate the rod 64 is prevented from being rotated in the reverse direction by the cam 61. and the projection 65 and in the other direction by the stop 76 and is moved outwardly to its rearward position where it can be rotated to regulate the gas flow until it reaches the safety locked position ; a stop 77 co-operating with the segment 71 limits the rotation of the shaft 56. The electromagnet core actuating rod 64 moves the electromagnet core 82 against the action of a spring 83 and a space is provided between the ends of the rod 64 and core 82 so that as the rod 64 pushes the core 82 into the electromagnet 84 the spring 83 is compressed and the ends of the rod 64 and core 82 abut. The rapid return of the rod 64 is damped by a weak spring 85, Fig. 18 or an electromagnet Fig. 19 (not shown). Adjusting screws and nuts 88, 89 are provided on the end of each rod 64. In the arrangement shown in Fig. 21 a burner electrode 90 is housed in an insulator located within a counter tubular electrode 95 carried in a rib of a tip-up hot plate frame 92 provided on its underside with contacts 93 in the circuit to the electrode and which engage spring loaded contacts on the stove body.