Pivot

A wearable cup holder that clips to a waistband. The arm pivots freely so centripetal force during walking presses liquid down into the cup instead of sloshing it out — the same principle that keeps water in a bucket swung overhead. Fully passive: no electronics, no actuators, one pivot.

Role

Independent

Year

2026

Discipline

Mechanical · Passive

• 01Mechanical Design
• 02Passive Mechanism

1. 01

   Identified the core physics: a freely pivoting arm lets centripetal force orient the cup so liquid presses into the base rather than over the rim.

2. 02

   Designed a single-pivot mechanical linkage with a clip that mounts cleanly to a waistband.

3. 03

   Iterated on arm length and pivot friction to balance responsiveness with stability during normal walking.

4. 04

   Validated the design by walking with filled cups and observing no-spill behavior across paces.

A fully passive wearable that keeps a drink upright during motion — no power, no actuators, one moving part.