#2309: Knottube

Today’s invention is a technique for making a tubular frame structure.

Instead of welding, brazing, bolting or gluing…why not try knotting?

Jointie

When making eg a bicycle frame, one tube would be filled with water under pressure.

The second tube would be similarly pressurised to maintain a mostly circular cross section and then bent, coarsely, into a knot shape around the first.

Both tubes would be subject to varying internal water pressure and tension applied to all four ends.

This would eventually allow a very tight knot to form so that both tubes would be pressed into each other, joining them tightly.

The tension and pressure would then be removed.