Integrated Push-Pull Door Lock with Nested Key Assembly
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Solution Overview
Problem
Conventional push pull door locks are complex in internal structure and bulky in size due to the need for multiple components in a narrow space, which makes it difficult to integrate locking means to lock the operation of the door.
Innovation Solution
A push pull door lock configuration that includes a door locking part, handles on both sides of the door, and integrated locking means comprising a key knob, a key assembly, and a stopper that interlock to lock the operation of the handles and thus the door.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If locking means are integrated into the push pull door lock, then security is enhanced, but the device complexity increases
Solution Approach 1:
The patent combines the locking means (key cylinder, key, and locking lever) directly into the push pull door lock body, merging previously separate components into a single integrated unit. This integration enhances security by ensuring the locking mechanism is inherent to the door lock structure, while the compact design minimizes the increase in device complexity
Solution Approach 2:
The key cylinder and locking lever are nested within the door lock body structure. The key cylinder is positioned within the lock body, and the locking lever is housed within the same structure, allowing the locking means to be contained within the existing door lock footprint without requiring separate external components
2Reliability
If locking means are added to the push pull door lock, then the door can be locked, but the volume of the door lock increases
Solution Approach 1:
The locking means are nested within the existing door lock body structure. The key cylinder is positioned within the lock body, and the locking lever is housed within the same structure, allowing the locking mechanism to be contained within the existing door lock footprint without requiring separate external components
Solution Approach 2:
The locking lever operates in a vertical dimension (moving up and down) rather than requiring horizontal extension. When the key cylinder rotates, the locking lever moves vertically to engage or disengage from the lock groove, utilizing the vertical space within the door lock body to provide locking functionality without increasing the horizontal volume
3Reliability
If the internal structure of the handle body is made complicated to accommodate locking means, then locking functionality is achieved, but the configuration becomes bulky
Solution Approach 1:
The locking mechanism is segmented into distinct functional components: the key cylinder for rotation, the locking lever for engagement, and the lock groove for positioning. Each component has a simple, dedicated function, and they work together through a straightforward mechanical interaction (rotation → lever movement → engagement), avoiding the need for complex interconnected mechanisms
Solution Approach 2:
The locking means are extracted as a separate, self-contained subsystem within the door lock. The key cylinder, locking lever, and lock groove form a distinct locking subsystem that operates independently from the push pull handle mechanism, allowing for simplified design and manufacturing of each subsystem
Data Source
AI summary
The present invention relates to a push pull door lock that includes a door locking part disposed inside a door to lock the door, bodies fixedly located to the indoor and outdoor sides of the door, handles pushedly or pulledly disposed on the bodies to release a locking state of the door locking part, and locking means disposed on the bodies to lock the operations of the handles so that the door is locked, wherein the locking means includes: a key knob rotatably disposed on the body located on the indoor side of the door; a key assembly rotatably disposed on the body located on the outdoor side of the door and connectedly rotating unitarily with the key knob; and a stopper connectedly rotating unitarily with the key assembly and locking the operations of the handles.