Connecting points of curves alternatively

I would like to create a continuous line through curves. To do that I need to connect the point alternatively.
The image shows a little bit better my aim.
I will offset a curve, leaving always 4 cm of gap in each curved. After I would like to connect them as the image shows.
Do you know how I have to treat the data?
example circle.pdf (74.3 KB)

Curve (8.6 KB)

Connecting points of curves (11.9 KB)

Is this what you want?..