GB1287427A - Improvements in or relating to ignition and control apparatus for gas-fired water heaters - Google Patents

Abstract

1287427 Igniting gas burners JUNKERS & CO GmbH 31 Oct 1969 [21 Feb 1969] 53407/69 Headings F4F and F4T [Also in Division H2] Ignition and control apparatus for a gas fired water heater comprises a piezo-electric ignition device 11 supported on a holder 22 which ignition device 11 is adapted to supply electrical energy to a spark gap of a pilot burner of the water heater and includes an anvil 12, at least one piezo-element in a socket 13, a striker 14 and a hammer 15, the hammer 15 being biased towards the striker 14 by means of a striker spring 25 against which the hammer 15 is movable by a cam in the form of a stop 20 carried by a neck 101 of a manually rotatable operating knob 10 for a gas valve of the water heater, the hammer 15 being arranged to be released by the stop 20 to effect ignition of the pilot burner when the operating knob 10 has been rotated from a closed position of the valve to an open position in which gas is supplied to the pilot burner. The hammer 15 is arranged on one end of a longer arm 231 of a bell-crank lever 23 which is pivotable about the other end of the shorter arm 232 on a pivot pin 24 secured to the holder 22. A leaf spring 21 is attached to the hammer 15, the leaf spring 21 comprising two angled limbs 211, 212, the free end of the limb 211 being secured to the end of the lever 23 carrying the hammer 15 and the free end of the other limb 212 being provided with a lug 213 bent so as to extend into the region of the stop 20. The leaf spring 21 is provided with a supporting member 26 of the same shape with two limbs 261, 262, the limb 261 being shorter than the limb 211 of the leaf spring to leave the lug 213 free. As illustrated in Fig. 2 (not shown), the striker spring 25 is a torsion spring which is located on the pivot pin 24 and which is provided with a hairpin shaped centre portion (251) which engages an abutment formed by a tongue 222 of the holder 22 and outer portions (252) wound helically around the pivot pin 24 to bias the hammer 15 towards the striker 14: another tongue 221 of the holder 22 which is a sheet metal member is constructed to receive the anvil 12. In operation, the operating knob is rotated counter clockwise (as shown in the Figs.) to open the gas valve and stress the strike spring 25. The stop 20 on the operating knob 10 carries the leaf spring 21 with it thereby pivoting the lever 23 and the hammer 15, until a position is reached where the lug 213 slides across the stop 20 to move the hammer 15 abruptly against the striker 14 under the spring force of the striker spring 25. The electric energy produced is conducted to a spark gap on the pilot burner by way of a connection tag 16 to ignite the gas issuing therefrom and gas may then be supplied to the main burner by further rotation of the operating knob 10.