Today’s invention is a bicycle pump which forms part of the frame.
When you need to inflate a tyre, release the stay which holds the seat in place.
Oscillate your body weight up and down on the seat, driving the pump piston (green) into the frame tube (blue). This pressurises air which allows a tyre to be connected using a hose (red).
No need to carry the extra weight (and theft risk) of a pump and it allows use of bodyweight to perform the work of pumping.
