1. You didn't turn on the agitator,
2. The agitator is broken,
3. There is something caught in the agitator
4. The hose is not connected to the agitator.
"Over the course of my investigation regarding this question, I have discovered the best three brands of carpet sweepers. They are: Bissel, The Hoover and The Electrostatic Carpet Sweeper."
1876
the carpet sweeper
it goes through brushes that pick up dirt which then leads to bellows (objects made from canvas to metal that open and close for suction) that pass the dirt to two different filters
1851 by melville Bissell
Melville Bissel
Dyson does make a carpet sweeper that is available online or in big box stores. They offer great cordless sweeping with a great power cord.
To clean wall-to-wall carpets.
The Carpet Sweeper
To suction the dirt out of your carpet
Daniel Hess who was he When did he died
There are several online retailers that sell replacement brush heads for a carpet sweeper. The best retailer is amazon.com they offer the best range of products and the best prices.