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    The Idea     6 prototypes     Development     Production
The idea
Marc Grue, inventor of the Double Trolley, explains how the project started:

"Jazz bassist Jesper Carlsen had converted a laundry basket trolley into a transportation device for his double bass (see left). I borrowed it from him and rolled my bass with it to and from orchestra rehearsals and concerts.

At that time I was looking for a high, adjustable stool to sit on, but I couldn't really find one high enough. One day I was looking at the laundry trolley and thought: It should be possible to put a seat on the top!"
Marc Grue with his double bass on the laundry trolley in 1992.
Marc Grue continues:

"I dropped another rebuild of the laundry trolley and went on with the possibilities of making a collapsible combined stool and trolley.

After a while I imagined the horrifying scenario of how the two legs (or rather wheels!) could roll out from under me during a concert!!

I therefore explored the idea of taking off the wheels instead. This was the birth of the Double Trolley and I started to work on the first prototype."


See how the prototypes of the Double Trolley were modified and improved over a period of 5 years!
One of many sketches for a collapsible combined trolley/stool (the seat is touching the shoulder of the bass).

 

I got the Double Trolley and it works very well! It is built more firmly and so easier to move the instrument and to sit on than I thought. Among all, I'm surprised at that it can make sharp turns so I can move the instrument in narrow space like a corridor in my home. All of my colleagues admired it, and some of them said they would like to buy it.

Today, when I took this picture, there was a slight strong earthquake, but my instrument which was standing with the trolley didn't fall down!

Yosuke Yamazoe
Japan
 

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