Safety cut-off for pressurized water vapor production devices for domestic use

1. Safety cut-off for devices for production of pressurised water vapour for domestic use, characterised in that it consists of a folding top ( 1 ) which is disposed in closing/opening relationship with the access to a funnel ( 2 ) through which the water must be poured for filling and refilling of the boiler in which the steam is produced, which top ( 1 ) has a top shaft ( 3 ) in relation with which there rotates a cam ( 4 ) which is integral with the top ( 1 ), and which has an active periphery which is applied to a camshaft ( 6 ) which is incorporated in a lever ( 5 ) which can rotate relative to a lever shaft ( 7 ), and which, spaced from the latter, has an aperture ( 8 ) through which there slides vertically a rod ( 10 ), which at its lower end incorporates a valve ( 9 ) for filling and closure, which is interposed between the funnel ( 2 ) and a chamber ( 12 ) for the steam produced in the boiler, which valve ( 9 ) for filling with water and closure can adopt two, upper and lower operative positions such that, in the upper position, the valve ( 9 ) for filling and closure acts as a shutter seat on the lower plane of a valve passage ( 11 ) which puts this funnel ( 2 ) into communication with the said steam chamber ( 12 ), and, in the lower position, the valve ( 9 ) for filling and closure is separated from this seat, the lever ( 6 ) of which has a torsion spring ( 13 ) associated with it, and can oscillate between two, upper and lower operative positions, such that, in the lower position, this torsion spring ( 13 ) is in its state of greatest relative tension, and the contact between the camshaft ( 6 ) of the lever ( 5 ) and the cam ( 4 ) of the top ( 1 ) takes place on a part of this cam ( 4 ) with a larger radius than that which is provided by the open position of the top ( 1 ), and in the upper position, the torsion spring ( 13 ) is in its state of greatest relative relaxation, and the contact between this camshaft ( 6 ) and cam ( 4 ) takes place on a part of this cam ( 4 ) with a smaller radius than that which is provided by the closed position of the top ( 1 ), and, in the upper part of this valve passage ( 11 ), the said rod ( 10 ) passes through the said aperture ( 8 ) in the lever ( 5 ), and projects from an end part on which there exists a flange ( 14 ) which has a size larger than the diameter of this aperture ( 8 ), and on which there is supported the lower end of a helical compression spring ( 15 ) which is weaker than the said torsion spring ( 13 ) which is associated with the lever ( 6 ), and which impels the filling and closure valve ( 9 ) to a lower position in which this flange ( 14 ) remains against the said aperture ( 8 ) and the lever ( 5 ) occupies its said lower position.

2. Safety cut-off for devices for production of pressurised water vapour for domestic use according to claim 1 , characterised in that, on its free edge, the top ( 1 ) forms a thumb grip ( 16 ).

3. Safety cut-off for devices for production of pressurised water vapour for domestic use according to claim 1 , characterised in that, in parallel with the said valve ( 9 ) for filling and closure, there is a safety valve ( 17 ) which is interposed between the said funnel ( 2 ) and the said steam chamber ( 12 ).

4. Safety cut-off for devices for production of pressurised water vapour for domestic use according to claim 1 , characterised in that one such device for production of pressurized water vapour is a type that is a gun that has a water retention seal ( 22 ) which prevents water from being emitted from the boiler when the gun is positioned horizontally, such that only water vapour is emitted, and, in addition, this retention seal ( 22 ) in turn constitutes a sealing element between the boiler itself and the support of the safety cut-off.

5. Safety cut-off for devices for production of pressurised water vapour for domestic use according to claim 1 , characterised in that, at its upper end, the rod ( 10 ) is extended by means of an extension ( 10 . 1 ) which at its tip incorporates an ostentatious colour, and is guided in a hole ( 24 ) which communicates with the funnel ( 2 ) closed by the top ( 1 ); with reference to the position of opening, or the lower position, and the position of closure, or the upper position, of the valve ( 9 ) for filling with water and closure, the extension ( 10 . 1 ) occupies respective lower and upper positions such that, in the lower position, its coloured tip is retracted in the hole ( 24 ), whereas, in the upper position, this tip penetrates in a cavity ( 25 . 1 ) which is formed in a transparent cover ( 25 ) located in the funnel ( 2 ).

6. Safety cut-off for devices for production of pressurised water vapour for domestic use according to claim 1 , characterised in that, between the valve passage ( 11 ) and the lever ( 5 ), there is interposed a plate ( 26 ), the size of the periphery of which is designed to leave a channel of communication with the funnel ( 2 ), which, although it is narrow, allows the water to access the steam chamber ( 12 ), and prevents steam from being able to be projected dangerously towards the user when the steam chamber ( 12 ) is filled with cold water when it is open and empty, but still hot from recent use.