Full-Height Latch Hinge for Pry-Resistant Storage Doors
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Solution Overview
Problem
Existing latching systems for storage units, such as lockers and cabinets, are prone to being pried open or accessed undesirably due to limited engagement length, susceptibility to damage, or high costs, and often require heavy doors that can be bent for unauthorized access.
Innovation Solution
A latching system with a pivotal latch hinge extending for more than 90% of the door's height, featuring a spring-biased in-turned segment on the door and a matching in-turned segment on the latch hinge, providing enhanced locking action and resistance to prying, along with a release mechanism allowing the door to be opened securely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single point latch with an attached lock is used, then the locking mechanism is simple, but the door can be pried open at the single latching point or bent at corners to provide unauthorized access
Solution Approach 1:
The latch system is divided into multiple segments with latching points distributed along the door's height (at least three latching points). This segmentation distributes the locking force across multiple locations, preventing the door from being pried open at a single point while maintaining a relatively simple overall structure.
2Strength
If heavy and/or reinforced door structures are employed, then the single point latching engagement is strengthened, but the door can still be pried open at the single latching point or bent at corners
Solution Approach 1:
Instead of concentrating strength in a heavy door structure, the invention segments the latching function across multiple points along the door edge. This distributes the mechanical engagement forces, making it difficult to pry the door open at any single location while using lighter door materials.
Solution Approach 2:
The latching system extends the engagement from a single point in one location to multiple points distributed along the vertical dimension of the door. This dimensional distribution of latching points prevents both prying and corner bending attacks.
3Reliability
If a multipoint hook latch with hooks welded to the frame is used, then the door can be secured at multiple points, but the hooks are susceptible to damage and the latch channel can be easily defeated by lifting through holes
Solution Approach 1:
Instead of having hooks protrude from the frame into the door (vulnerable to damage), the invention inverts the arrangement by having latching points on the door engage with corresponding points on the frame. This reversal protects the critical latching components from direct impact and prying forces.
Solution Approach 2:
The invention uses a latch channel that replicates the engagement geometry of traditional hook latches but distributes the engagement across multiple points along the door height. This provides the security of multipoint engagement without the vulnerability of individual hooks that can be damaged or defeated through ventilation holes.
4Reliability
If a hasp extending through the door assembly is used, then the door can be secured with a padlock, but heavy doors are required and the structure can be defeated by bending at corners
Solution Approach 1:
The hasp-style single point locking is segmented into multiple latching points distributed along the door height. This distributes the securing function across multiple locations, preventing corner bending attacks while using lighter door construction without requiring a heavy hasp structure.
5Reliability
If a multipoint turn handle with push rods is used, then a strong locked connection is provided, but the assembly is expensive and the door cannot be slammed shut
Solution Approach 1:
The latch channel is designed to automatically engage with the frame's latching points when the door is closed, eliminating the need for manual operation of push rods or complex actuating mechanisms. The door's closing motion itself performs the latching function, enabling slam shut capability while maintaining strong locked connection.
Solution Approach 2:
The complex turn handle assembly with mechanical push rods is extracted and replaced with a simpler latch channel that passes through the door. This removes the expensive and complex mechanical actuation system while retaining the security benefits of multipoint engagement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides a highly reliable and secure locking mechanism that resists prying and bending attempts, maintaining the door's closed position effectively while allowing easy opening with a secure release mechanism, even when subjected to forceful access attempts.
Implementation Method 1
The pivotal latch hinge is normally spring-biased into a position for overlying the latching member of the door to maintain the door in a closed position
Data Source
AI summary
A storage system including peripheral walls providing a storage area and a pivotally mounted door closing an opening into the storage area. A latching mechanism includes a latch member attached to a peripheral wall cooperating with an inturned latching member on the door to maintain the door closed. The cooperating latch member and inturned latching member extend for more than 25% of the height of the door and most preferably approximately 100% of the height of the door. In another aspect of the invention the latch member and the inturned latching member overlap each other when the door is closed and are forced in a direction to further overlap when a prying force is applied between contiguous surfaces of the door and peripheral wall.