toggle joint

noun Machinery.

1. 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.

noun

1. 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