The Beltless Bison
I understand that the Bison was belt less. The brush roller was driven by gears. I was also told that the gears were prone to break, were very loud and the company had many complaints. However, the idea was good. You could push a leaver on the side with your foot and disconnect the nozzle from the motor unit. I believe that the designer of the Bison had worked for Kirby, had the idea for the belt-less design but Kirby did not want to use it, so he started his own company. My former boss told me that a lot of Kirby salesmen went to Bison. Someone once told me that he had converted a Bison to use Kirby belts, but I don't know how well that worked.
Weather it was a good design or not I'd love to have one. It's certainly a one-of-a-kind vac.