Locking Device Spindle Rotary Assembly Torque Drive

The patent extracts the key from the locking system by providing a spindle that can be directly driven by external torque without requiring a key. The spindle is made detachable from the latch, allowing it to be driven independently by torque from various sources (manual rotation, motor, etc.), thereby eliminating the need for a key while maintaining reliable locking function.

The spindle is designed with multi-functionality: it can be detachably connected to the latch for driving the bolt, and simultaneously can be directly driven by external torque without a key. This universal design allows the same spindle to accommodate different operating methods (manual rotation, motor drive, etc.), improving ease of operation while maintaining locking reliability.

The patent applies preliminary anti-action by providing a limit assembly that prevents the spindle from rotating beyond a predetermined angle. This limit assembly (comprising a limit shaft and position-limiting member) is configured to stop the spindle before it can disengage from the latch, thereby preventing accidental release while allowing convenient operation within the safe rotation range.

The limit assembly acts as an intermediary between the spindle and the latch. It mediates the interaction by allowing the spindle to rotate freely within the safe range for convenient operation, while simultaneously preventing excessive rotation that would cause accidental release. The limit shaft and position-limiting member work together as an intermediary mechanism to ensure both convenience and security.

The limit assembly is designed with local quality by focusing the limiting function on specific components (limit shaft and position-limiting member) rather than redesigning the entire locking mechanism. The limit shaft is rotatably connected to the latch body, and the position-limiting member is selectively engageable with the spindle, creating a localized solution that adds minimal complexity while providing effective security.

The limit assembly uses a position-limiting member that can be selectively engaged or disengaged from the spindle. When not needed, the position-limiting member can be discarded (disengaged) to allow full spindle rotation, and when security is needed, it is recovered (engaged) to prevent excessive rotation. This selective engagement reduces overall device complexity by allowing the limit function to be activated only when necessary.