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1. (WO2012171100) PICK-UP HEAD SYSTEM
Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

I CLAIM:

1. A pick-up head system for use with a surface cleaning vehicle, said dustless pick-up head system comprising:

a main housing having a surface engaging portion and a substantially hollow interior;

a main fan having an inlet connected in air suctioning relation to said substantially hollow interior of said main housing and an outlet connected in air delivering relation to said substantially hollow interior of said main housing, for re-circulating high speed air through said main housing;

a secondary substantially continuously available source of low air pressure having an inlet connected in air suctioning relation to said substantially hollow interior of said main housing;

a valve operatively mounted between said substantially hollow interior of said main housing and the inlet of said secondary substantially continuously available source of low air pressure, wherein said valve is selectively movable between a reduced-flow position and an increased-flow position; and,

a control mechanism operatively connected to said valve and responsive to at least one operational condition in said dustless pick-up head system, for moving said valve between said reduced-flow position and said increased-flow position when said at least one operational condition passes a threshold, thereby decreasing the air pressure in said substantially hollow interior of said main housing, thus precluding the escape of dust and other fine particulate matter from said substantially hollow interior of said main housing.

2. The dustless pick-up head system of claim 1 , wherein said secondary substantially continuously available source of low air pressure comprises a secondary fan.

3. The dustless pick-up head system of claim 1 , wherein said control mechanism comprises at least one air pressure sensor and is responsive to changes in air pressure in said surface cleaning apparatus.

4. The dustless pick-up head system of claim 1 , wherein said control mechanism comprises at least one air flow sensor and is responsive to change in air flow in said housing.

5. The dustless pick-up head system o; claim 7. wherein said control mechanism is responsive to change in air flow speed in said housing.