Observed arrival · 2026-11-03
The Four-Bar Linkage, Rebuilt as Nine Mechanisms
A Chinese-language mechanical reference explains seven categories of hinged four-bar mechanisms through nine animated diagrams, with an interactive demonstration of how changing the fixed frame transforms the mechanism.
- For
- Mechanics students and engineering educators
- Worth noticing
- The four-frame comparison reuses the same linkage and angle while changing which component is fixed.
Field notes
The page distinguishes crank-rocker, double-crank, and double-rocker forms, then traces four evolved mechanisms back to changes in joints or frame selection. Its frame-switching demo says the views share one angle and the same linkage coordinates, making the change in absolute motion the focus. The reference also lists application examples such as a sewing-machine pedal, a car steering linkage, and a hand pump.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
One card from the complete issue