English version: 06/29/2015, German version: 04/20/2014
Two devices on the market,
are merged into a single. The disadvantages of the individual devices neutralize each other and operate even for the benefit.
Smartphone charger with hand crank
The dynamo housing gets two levers with handles instead of the crank, which are arranged as a conventional hand exerciser.
The movement (opening and closing of the hand) gets its mechanical resistance not from a spring, but by the dynamo.
For this, the lifting movement is converted via a crank and a suitable translation into the required rotation.
In the housing there is a USB port available the smartphone can be connected to. Finished!
Housing and handles should be constructed as "flat" as possible and it should be possible to lock the handles in the "closed position", so that the device can easily be taken along.