Safety device for a lighting valve of a gas burner

Details Safety device for a lighting valve of a gas burner Safety device for a lighting valve of a gas burner

2007-08-07

2007-08-07

Lee, Kevin (Department: 3753)

Fluid handling

Combustion failure responsive fuel safety cut-off for burners

Thermo-electric

C137S614190, C137S614210, C431S054000

Reexamination Certificate

active

11102275

ABSTRACT:
A safety device (61) for a lighting valve (23) of a gas burner, comprising a starting button (36), a return spring (57), a cutoff shutter (42) controlled by the starting button (36), a control shutter (41) for a pilot light nozzle, and a holding electromagnet (54) for the control shutter (41). 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, whilst the holding electromagnet (54) is dependent on the pilot light to hold open the control shutter (41). 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). There are provided a hooking condition and an unhooked condition for the starting button: 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) without being influenced by the starting button (36); and, in the unhooked condition, the starting button (36) can return to the lifted position to open the cutoff shutter (42) for the flowing of the gas to the burner, the unhooked condition requiring a further rotation of the starting button (36) spaced away from the angular start position.

REFERENCES:
patent: 2297856 (1942-10-01), Ames
patent: 4081235 (1978-03-01), van der Veer
patent: 4242080 (1980-12-01), Tabei
patent: 4442853 (1984-04-01), Gort
patent: 6886581 (2005-05-01), Harniet

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