Patent ID: 7252109

Claim:
A safety device ( 61 ) for a lighting valve ( 23 ) of a gas burner ( 16 ), comprising a starting button ( 36 ) provided for depression, a return spring ( 57 ) for returning the starting button ( 36 ) to a lifted position, a cutoff shutter ( 42 ) controlled by the starting button ( 36 ) and arranged upstream of the burner ( 16 ), a control shutter ( 41 ) for a pilot light nozzle ( 17 ), and a holding electromagnet ( 54 ) for said control shutter ( 41 ) wherein the control shutter ( 41 ) is normally closed and is actuatable through the starting button ( 36 ) for the flowing of the gas to the pilot light nozzle ( 17 ), whilst the holding electromagnet ( 54 ) is dependent on the pilot light to hold open said control shutter ( 41 ), said safety device ( 61 ) being characterized in that the starting button ( 36 ) is provided for rotation and can be depressed only for a given angular start position so that, for starting the lighting, the button ( 36 ) must be rotated up to said start position and subsequently depressed to close the cutoff shutter ( 42 ) and open the control shutter ( 41 ), whereby allowing the flowing of the gas to the pilot light nozzle ( 17 ); said safety device ( 61 ) providing a hooking condition and an unhooked condition for the starting button ( 36 ), wherein, in the hooking condition, the cutoff shutter ( 42 ) is closed and the control shutter ( 41 ) is open under the control of the holding electromagnet ( 54 ) and without being influenced by the starting button ( 36 ); and wherein, in the unhooked condition, the starting button ( 36 ) can return to the lifted position under the action of the return spring ( 57 ) to open the cutoff shutter ( 42 ) for the flowing of the gas to the burner ( 16 ), said unhooked condition requiring a further rotation of the starting button ( 36 ) spaced away from said angular start position.