Explainer: Lid rigidity, hinge force, the CNC Top Cover, and the new 4.0kg Hinge Kit

Framework Laptop 13
19

There are two parts to this user-adjustable / variable force hinge:

  1. Variable uniformed force.
  2. Variable rotation-dependent force.

For the 2nd part, there’s this design:
https://www.patentlyapple.com/2017/01/apple-patent-reveals-new-macbook-hinge-system-with-torsion-bar-to-provide-variable-cover-resistance.html

And earlier design:
https://www.mysciencework.com/patent/show/limited-torque-drive-roller-US4103516A

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