Answer
A PIVOT POINT
支點（pivot point）
WINDOW QUESTION · ANSWERBUILD CLUB
The question
WHAT IS THE FIXED CONNECTION POINT THAT A MECHANICAL PART ROTATES AROUND?
讓機械零件能繞著固定位置轉動的連接點叫什麼？
Why it works
THE GRABBER USES SEVERAL PIVOTS SO ITS LINKAGES CAN EXTEND, RETRACT AND GRIP
抓取機用多個支點讓連桿伸展、收回並夾住物體
See it in action · PIVOT POINTS IN A GRABBER
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