Tamper-Resistant Trapped Key Interlock for Loading Bay Safety

The locking mechanism is divided into two independent latching members: a primary latching member and a secondary latching member. Each member operates independently but must both be satisfied for key release, creating a segmented security system that prevents tampering while maintaining operational simplicity

The secondary latching member is automatically engaged by the coupling's spur during the normal coupling process, before the key can be accessed. This preliminary action ensures that even if someone attempts to interfere with the primary latching mechanism, the secondary mechanism remains engaged and prevents key removal

The safety interlock is segmented into two independent latching members with distinct functions: the primary latching member controls normal operation, while the secondary latching member provides tamper resistance. This segmentation increases reliability without requiring complex electronic systems

The coupling's spur acts as an intermediary that automatically engages the secondary latching member during normal coupling. This intermediary mechanism ensures that the secondary latch is activated only through proper coupling procedure, maintaining safety without adding complex control systems

The secondary latching member provides preliminary anti-action by being automatically engaged during coupling and remaining engaged until proper procedure is followed. This pre-established barrier prevents any manual interference attempts from freeing the key, countering potential tampering before it can occur

The rigid connection between the secondary latching member and the coupling body, which might seem to restrict access, actually provides the benefit of tamper resistance. The very structure that prevents easy access also prevents unauthorized key removal, converting a potential disadvantage into a security advantage