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Difficulty: MediumGripping and Holding Tools

Locking pliers use an over-center toggle mechanism that maintains high clamping force on a workpiece without requiring the operator to apply continuous hand pressure.

Answer: Answer

Answer

True
Locking pliers are specifically designed with an over-center toggle linkage that holds the jaws shut under high tension, freeing the user from having to squeeze the handles continuously.

Step-by-Step Solution

1
Identify the core mechanical structure of locking pliers (commonly known by the brand name Vise-Grip).
Locking pliers feature a movable handle connected to a toggle link, an adjustment screw in the fixed handle, and a release lever.
Understanding the tool's anatomy reveals how it applies and maintains holding force.
2
Analyze the kinematic action that occurs when the handles are closed over a workpiece.
The toggle linkage pivots slightly past its center point (over-center position), which mechanically locks the jaws under tension.
This over-center toggle action creates a mechanical lock that does not slip open under load.
3
Determine whether continuous hand pressure is necessary once locked.
Once locked over center, the tool maintains full clamping pressure entirely hands-free until manually released.
The statement correctly describes the defining operating principle of locking pliers.

Key Concept

Toggle-lock mechanism and hands-free clamping of locking pliers
Estimated Time:45s
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Topics

Gripping and Holding Tools

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