My beloved Brompton Bike

Everyday I have to bike to work. In my day to day comute I can only imagine a Brompton to the help. I am fast and furious biking and when I arrive to my work destination like a transformers I can reshape my bike to soothing small that doesn’t look like a bike. Thats nice!!! This bike is my companion it goes with me to work and takes me back, day and night. A bike full of engineering, that looks simple but has a few thoughtful engineering details that make it’s design unique. Firstly let me introduce the symbols. One of them is the Brompton tag a reference mark for every Brompton bike lover.

The Brompton Tag
The Brompton Tag

The next detail is near the pedal the folding guide.

The pedal in the metal
The pedal in the metal

Not part of the Brompton brand but my personal favourite tyres the Marathon tyres which also fit very well with the big but also give the night effect circular reflection.

Brompton tyres
Brompton tyres

And I could not forget the pentagon clip holder. For those who prefer to carry luggage on the front these are the two screws that hold everything together.

Brompton bag connection
Brompton bag connection

This bike has a lot of interesting things happening all around.

Straight leg seat design for a bit of fun

Remembering when I was small, where i played countless hours with lego. Built many interesting constructions and tested the strength of many designs. That was a form of modeling the behaviour of a bridge, house or any structural  analysis that I could think of at that time. We all model things every day since we need to live in this world and figure out even if very basically the behaviour of objects. Think that when you hold an object you use the right force to hold it. Some how we know exactly the necessary configuration to execute physical task even without any though what so ever. When we look at a design and it challenges our notation that it will work it is because our underlaying protective system already is calculating and giving us feedback that it is dangerous to use. However this feeling can be wrong and the structure can be very safe, however most of the time our body is wright :).

I tested two designs on the simple table to understand what would happen.

Straight leg table
Straight leg table

This design present complete load transfer to the legs. The connection between table and leg is compress. Very little to none torsion is present. This design looks very stable, simple and is the classic, maybe the only simpler alternative is to use a solid cylinder instead, but that would make the seat very heavy. This design probably will hold as much as what the material used (wood, iron) can handle.

Table with tilted legs
Table with tilted legs

Comparing one design with another we can see that the behaviour to pressure  is completely different. The straight legs approach is stronger and would deal better with increased weight on top.