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Flip to reveal answersWhat are the three purposes of a linkage?
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All 4 Flashcards — Linkages
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Question
What are the three purposes of a linkage?
Answer
Changing the direction of a movement, altering the magnitude of a force by making the arms unequal, and making a part follow a particular path.
Question
What is the difference between a fixed and a moving pivot?
Answer
A fixed pivot is attached to the frame and cannot move; a moving pivot travels with the bars. Finding the fixed pivots first is how a linkage is read.
Question
Name the three linkages and what each does.
Answer
Reverse motion — one fixed pivot, the output moves the opposite way. Parallel motion — two fixed pivots with equal bars, the output stays parallel. Bell crank — a right-angled bar turning movement through 90°.
Question
Why does a toolbox tray use a parallel linkage rather than a lever?
Answer
Because two equal bars stay parallel, so the tray translates without tilting. A single lever swings its far end through an arc and the contents slide off.
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Topic 3.3 hub
Mechanical systems
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