A compact latch system that flips inward to secure a cylindrical part

This mechanism uses two hinged green arms that flip inward to lock onto a yellow cylindrical sleeve. In the animation, the arms sit inside a housing and pivot around fixed pins. A purple sliding block, driven by a long gold actuator rod, forces the arms outward and then allows them to snap inward into the groove of the yellow sleeve.

Components — The assembly includes the outer housing, two hinged green locking arms, the yellow cylindrical sleeve with a recessed groove, the purple sliding block, and the long gold actuator rod that drives the locking motion.

How it works — When the actuator rod pushes the purple block forward, the block spreads the two arms outward so they can pass over the end of the yellow sleeve. As soon as the block clears the groove area, the arms pivot inward and latch into the groove, firmly locking the sleeve in place. Pulling the rod backward re-expands the arms, allowing the sleeve to be released.

Applications — Common in quick-change tool holders, mechanical latching systems, machine-tool fixtures, and modular connectors.

Why it matters — The inward-flipping two-arm latch provides fast, reliable locking using few parts and no complex mechanisms—ideal for tight spaces and quick, repetitive operations.