Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Reexamination Certificate
2006-12-19
2006-12-19
Till, Terrence R. (Department: 1744)
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
C015S384000
Reexamination Certificate
active
07150068
ABSTRACT:
A vacuum cleaner power head (40) for vacuum cleaning and having two counter rotating agitators52and54. Motor (60) rotates agitators (52) and (54) through transmission (70), and also rotates suction fan (65) to provide suction air to the rotary brush agitators. Exterior housing48and inner housing (49) provide air suction passageways to direct suction air through fan (65) and out of the housing to a dirt collection bag (34). Self-propelled function is provided by using user force on handle (32) to create differential contact friction between the two counter-rotating rotary brush agitators so that a net traction force is generated that propels power head (40) in the direction the user is pushing.
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