1. REVERSE ENGINEERING THE HINGE ON GLASSES
By Thomas Crowley

2. GLASSES HINGE
• I am going to explain how the hinge to a pair of glasses works.
• purpose of hinge is to allow the arms and ear pieces of frame to fold,
allowing it to be more compact
• The purpose of glasses to allow people see clearly (whether in sunlight
or prescription)

3. POWER MODEL
Source 1st Action 2nd Action
Hand/Fingers Opens the hinge Close hinge
Spring Snaps hinge to full Snaps hinge to full
open position closed position
Human/Automated Human open/close Spring keeps that
the hinge way

4. HOW IT WORKS
• Temple of glasses open/close.
• Hinge snaps temple “closed” with small added force
• Hinge snaps temple “opened” with small added force

5. ASSEMBLED

6. UNASSEMBLED

7. ACTION

8. RESEARCH
• Internet
• Found out it’s a Spring-loaded hinge
• No additional info

9. HISTORY
• Idea from Assyrians, used clear crystal to magnify
objects 700 B.C.
• Romans used glass jars with water
• Salvino D’Armate of Florence, Italy made first wearable
glasses in 1284 A.D.
• Nicholas of Kues, Germany made the first near-sighted
lenses in 1604
• Benjamin Franklin made Bi-focal glasses in 1784

10. CONCLUSIONS
• Hypothesis correct :D