Retractable Arm Pawl Lock to Prevent Collection Box Item Tearing

The retractable arm with pawl mechanism proactively prevents the door from reopening before fully closed by mechanically blocking the door's movement path. The pawl engages with the outer tube to create a physical barrier that stops the door before it can catch items, eliminating the harmful effect before it can occur.

The retractable arm acts as an intermediary mechanism between the door and the internal components. It provides a controlled interface that allows the door to open and close while preventing direct contact between the door and items that could cause catching or tearing.

The resilient element allows for partial reopening of the door beyond the normal locked position, providing just enough additional movement to remove hands or small objects without fully compromising the protective function. This partial action satisfies safety needs while maintaining adequate item protection.

The resilient element acts as a cushioning mechanism that allows controlled deviation from the locked position. It provides a buffer that permits limited door movement for safety purposes while maintaining the overall protective function, cushioning against the need for complete door reopening.

The pawl mechanism is self-actuating through the resilient element. When the door closes, the resilient element automatically pushes the pawl into engagement with the aperture, locking the arm without requiring additional actuators, sensors, or control systems. This self-service approach maintains high reliability while minimizing added complexity.

The patent replaces complex electronic locking systems with a purely mechanical pawl-and-aperture engagement mechanism. This mechanical substitution achieves reliable locking through simple geometric interlocking and elastic force, avoiding the complexity of motors, sensors, and control electronics.