Patent ID: 7207358
Filing Date: 2007-04-24
Classification: F22B

Abstract:
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.