Motorola’s Razr folds in half without a crease. The secret is in the hinge design

It took Motorola four years and a feat of engineering in the hinge design to make the new Razr possible.

Motorola Razr foldable phone
Motorola Razr foldable phone

When I held the new Motorola Razr foldable phone in my hand, all I wanted to do was open and close it a thousand times.

By Patrick Holland

Not because I wanted to test the screen or durability (like we did with the Galaxy Fold), but because that’s what I did all the time when I had the original Razr flip phone in 2005. 

Plus, I was in the best place to do it: Motorola’s headquarters in Chicago. Specifically, I toured a lab filled with industrial machines used to test and build the foldable screen phone. On one side of the lab there were handwritten measurements scribbled on a wall like markings you make to keep track of a kid’s growth. Next to that was a menacing machine used to drop the Motorola Razr repeatedly to test durability. My guess is that the measurements were the different heights Motorola dropped the phone. Also, I wondered if I should be wearing safety glasses.

It was early November and I was at Motorola to see how the hinge on its new Razr was designed, iterated and implemented. If the Razr’s folding screen is the star of the show, then the hinge is the stage manager making it all work.

As I toured the lab, I kept flicking the Razr open and close with my thumb. The “thud” sound it made wasn’t exactly the same as the original, but it was still immensely satisfying. More

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Patrick Holland cnet.com