Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent
1997-09-11
1999-04-13
Redding, David A.
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
15319, 15375, 15421, A47L 500
Patent
active
058931953
ABSTRACT:
Disclosed is a safety device for a power brush of a vacuum cleaner which has a simple structure and can automatically cut off an electric source supplied to the driving motor of the power brush. A cylindrical air duct is vertically provided on the brush. The air duct is attached to the body of the cleaner. A negative pressure generated by a sucking force generated by the rotation of the driving motor in the body of the cleaner acts on the air duct. An air valve moves inward by the negative pressure in the air duct. At a first end of a rod, the air valve is mounted and at a second end facing the first end, a spring for applying a rotating force to move the air valve to an external direction, is provided. The rod is movably supported by a moving shaft provided near the outer periphery of the air duct. A switch is provided at the second end side of the rod having the spring. The switch is off to cut off the electric source applied to the driving motor of the power brush to prevent the rotation of a rotating roller when the air valve moves to the external direction by the action of the spring. Accordingly, when a user does not use the vacuum cleaner, various safety accidents induced by the rotating force of the power brush can be prevented.
Daewoo Electronics Co. Ltd.
Redding David A.
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