Patent ID: 7237409

Claim:
A safety device mounted in a steam cleaner, comprising: a cap assembly comprising a rotary cap, a cylindrical clutch including a top short protrusion, a bottom cavity, and a plurality of legs on a bottom periphery, and a first spring having a lower portion put on and anchored by the protrusion so as to be biased in a chamber of the cap; an actuation assembly comprising a hollow, cylindrical seat having external threads, a flexible actuating member having a central through hole and an annular bottom ridge, a shroud having internal threads threadedly secured to the seat and a top central hole, a top of the shroud being urged against the bottom cavity of the clutch and the actuating member being fastened therein, and a pushing member including a top push rod inserted through the hole of the actuating member and the hole of the shroud to be in contact with the bottom cavity of the clutch, and an annular groove matingly engaged with the ridge; and a lock assembly comprising a cylindrical base including a central opening confined by an annular flange, the base being threadedly secured to the cap, a hollow driving disk including a central hole, a plurality of peripheral notches with each leg being snugly inserted thereinto, and two opposite tabs provided on an edge of the central hole thereof, a hollow cylinder including a top annular flange having two opposite slots with the tabs fitted therein for coupling the cylinder to the driving disk, upper internal threads, and lower external threads, a hollow valve including an externally threaded top extension threadedly secured to the seat, and a lower extension seated on an internal shoulder of the cylinder, an externally threaded sleeve threadedly secured to the internal threads, and a second spring compressed between the sleeve and a lower annular flange of the valve; wherein a rotation of the cap is adapted to detach the cap assembly when the steam cleaner is not operating or steam pressure inside the steam cleaner has not reach a predetermined safety value; and responsive to generated steam reaching the predetermined safety value, the steam passes through the valve to lift the pushing member for compressing both the actuating member and the first spring and disengaging the legs from the notches prior to exiting the steam cleaner such that rotating the cap will not cause the lock assembly to rotate.