Lockbox Multi-Position Shackle for Door Handle Security
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Solution Overview
Problem
Traditional lockboxes are not securely adaptable to various door handle sizes and shapes, can be tampered with, and may scratch or mar the door hardware due to their fixed size and metal construction.
Innovation Solution
A lock assembly with a U-shaped shackle and adjustable latching mechanism that securely fits around door handles of different sizes and shapes, featuring a guard wall for enhanced contact and prevention of removal by tools like crowbars, and a casing to prevent scratching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a traditional lockbox is constructed of metal with a fixed size, then it provides strength and security, but it may scratch or mar the door handle and does not fit various door handle sizes
Solution Approach 1:
The shackle is designed with adjustable positioning capabilities, allowing it to be moved to different locations around the door handle. This dynamic adjustment enables the lockbox to adapt to various door handle sizes and shapes while maintaining a secure fit, resolving the contradiction between fixed metal construction and adaptability.
Solution Approach 2:
The lockbox incorporates adjustable parameters including shackle position, latching mechanism settings, and contact surface characteristics. These parameter changes allow the rigid metal lockbox to accommodate different door handle dimensions without scratching or marring them, while preserving the inherent strength of the metal construction.
2Device complexity
If a traditional lockbox has a fixed size and shape, then it is simple in structure, but it cannot securely fit on door handles of various sizes and shapes
Solution Approach 1:
The lockbox is divided into modular components including the body, shackle, and latching mechanism. The shackle can be independently adjusted to different positions, and the latching mechanism can engage at multiple points. This segmentation allows the lockbox to adapt to various door handle geometries without requiring complete redesign of the entire structure.
Solution Approach 2:
The lockbox design incorporates universal features that enable it to function with multiple types of door handles. The adjustable shackle and multi-position latching mechanism provide multi-functionality, allowing a single lockbox design to securely fit various door handle sizes and shapes while maintaining structural simplicity.
3Reliability
If the lockbox is designed to prevent tampering and forcible removal, then it provides enhanced security, but it increases device complexity
Solution Approach 1:
The lockbox incorporates preliminary protective features such as a guard wall that extends to prevent insertion of tools like crowbars between the shackle and door handle. This preliminary action against potential tampering attempts enhances security without requiring complex active defense mechanisms, maintaining relatively simple overall structure.
Solution Approach 2:
The guard wall acts as an intermediary element between the shackle and the door handle, preventing direct contact between potential tampering tools and the shackle. This intermediary structure provides enhanced security against forcible removal while adding minimal complexity to the overall lockbox design.
4Ease of manufacture
If the lockbox uses a single sized design, then it is easy to manufacture, but it only accommodates a single sized door handle
Solution Approach 1:
The adjustable shackle design provides a counterbalancing approach where the ability to reposition the shackle compensates for the fixed size of the lockbox body. This allows a single standardized lockbox design to be manufactured easily while still accommodating various door handle sizes through the adjustable shackle mechanism.
Data Source
AI summary
A lock assembly includes a lock body and a U-shaped shackle having a curved portion extending between first and second legs receivable in first and second shackle apertures in an upper portion of the lockbox body. The shackle has a guard wall affixed to an interior surface of the curved portion, the guard wall defining an interior arcuate wall surface extending forward and rearward from a central plane bisecting the shackle. The upper portion of the lock body includes first and second protruding projections at least partially surrounding the first and second shackle apertures and defining first and second upwardly diverging interior surfaces laterally aligned with the curved portion of the shackle. The lock body includes a latching mechanism configured to secure the shackle in a plurality of latched positions to adjust a distance between the first and second upwardly diverging interior surfaces and the curved portion of the shackle. When the shackle is secured around a door handle with the shackle secured in a suitable one of the plurality of latched positions, abutment of the interior arcuate wall surface with a neck portion of the door handle impedes forward and rearward rotation of the lock assembly about a horizontal axis extending through the curved portion of the shackle and abutment of the first and second upwardly diverging interior surfaces with a neck portion of the door handle impedes side-to-side twisting rotation of the lock assembly about a vertical axis extending through the curved portion of the shackle.