toggle-joint

toggle joint

noun Machinery.
any of various devices consisting basically of a rod that can be inserted into an object and then manipulated so that the inserted part spreads, becomes offset, or turns at a right angle to the exterior part, allowing it to be used as a support, handle, linkage, lever, etc.

Origin:
1840–50

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
toggle joint
 
n
a device consisting of two arms pivoted at a common joint and at their outer ends and used to apply pressure by straightening the angle between the two arms

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