Door Handle Spindle Decoupling for Secure Lock Operation
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Solution Overview
Problem
Existing door locking systems are complex and require additional installation space, and there is a need for a simplified and space-efficient solution that ensures secure operation of door locks.
Innovation Solution
A door locking system with an interior and exterior handle unit, a polygonal spindle, and a coupling spindle that can be adjusted between coupled and decoupled positions, featuring an unlocking unit with a barrier and spring mechanism to prevent unintended operation from the exterior handle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional locking systems are installed below the door locking system, then secure operation is improved, but installation space requirements increase
Solution Approach 1:
The patent combines the locking system and additional locking mechanism into a single integrated door locking system. The polygonal spindle with coupling spindle integrates both locking functions (interior and exterior control) and the additional locking mechanism (via the coupling pin and barrier) into one compact unit, eliminating the need for separate locking systems and reducing installation space requirements.
2Reliability
If disconnectable sub-pins are connected and disconnected by means of an additional connecting pin, then secure operation is improved, but device complexity increases
Solution Approach 1:
The coupling spindle serves multiple functions: it acts as both a connecting element between the interior and exterior spindles and as a locking element that can be engaged or disengaged via the barrier mechanism. This multi-functional design eliminates the need for separate connecting pins and reduces overall system complexity while maintaining secure operation.
3Reliability
If the barrier prevents axial movement of the coupling pin, then prevention of unintended operation is improved, but ease of operation decreases
Solution Approach 1:
The barrier is designed to be movable between two states: engaged with the coupling pin to prevent axial movement (preventing unintended operation), and disengaged to allow axial movement (enabling operation). This dynamic design allows the system to switch between secure and operational states as needed, balancing security and ease of operation.
4Ease of operation
If the coupling spindle is made axially displaceable, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The spindle system is segmented into three separate components: interior spindle, exterior spindle, and coupling spindle. The coupling spindle can be independently displaced axially relative to the other spindles, allowing for simplified control of the locking mechanism without requiring complex integrated movements, thus improving ease of operation while managing device complexity through modular design.
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The invention relates to a door locking system (1) comprising an interior handle unit (2a) with an interior handle (3a) and an exterior handle unit (2b) with an exterior handle (3b). The door locking system (1) further comprises a polygonal spindle (5) with an interior pin (6a), an exterior pin (6b), and a coupling pin (7). The interior pin (6a) is rotationally fixed to the interior handle (3a), and the exterior pin (6b) is rotationally fixed to the exterior handle (3b). The coupling pin (7) is axially displaceable within the interior pin (3a) and the exterior pin (3b). The polygonal spindle (5) can be adjusted from a coupled position to a disengaged position and back again by axially displacing the coupling pin (7).According to the invention, the door locking system (1) comprises an unlocking unit (8) which, in the decoupling position of the polygonal pin (5), prevents the polygonal pin (5) from being moved from the decoupling position to the coupling position and, when the inner handle (3a) is pivoted about the pivot axis (SA), releases the polygonal pin (5) from being moved from the decoupling position to the coupling position.