Self-Protecting Door Handle Assembly With Retractable Lever Locking
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Solution Overview
Problem
Conventional door latches with rotatable handles are vulnerable to tampering and forced entry, lacking an effective mechanism to prevent unauthorized access and providing a secure, user-friendly interface.
Innovation Solution
A self-protecting door handle assembly with a retractable lever that rolls into a protected configuration when locked, utilizing a motor to rotate the lever along an axis parallel to its center, and a restricting surface to prevent actuation, combined with electronic or biometric user interfaces for control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed rotatable handle is used in conventional door latches, then the device is simple and easy to manufacture, but it is vulnerable to tampering and forced entry
Solution Approach 1:
The patent applies the dynamics principle by making the lever movable between multiple configurations (extended, retracted, and intermediate positions) rather than fixed. The lever can be dynamically positioned along its longitudinal axis, allowing it to extend outward for access or retract inward for security, thus resolving the contradiction between simplicity and security.
Solution Approach 2:
The patent segments the lever into a movable component that can be independently positioned relative to the door assembly. The lever base remains fixed while the lever itself can slide or roll along the longitudinal axis, creating distinct functional segments that enable both secure retraction and accessible extension states.
2Reliability
If the lever is made retractable to improve security, then forced entry becomes more difficult, but the mechanism becomes more complex
Solution Approach 1:
The lever transitions from a static fixed position to a dynamic retractable position, enabling it to move between extended and retracted states. This dynamic capability allows the lever to provide security when retracted while remaining accessible when extended, directly addressing the forced entry resistance requirement.
Solution Approach 2:
The patent extracts the lever from its traditional fixed rotational function and adds a separate longitudinal movement capability. By separating the rotational actuation function from the positional configuration function, the lever can be retracted along its axis independent of its rotational state, simplifying the overall mechanism while improving security.
3Reliability
If a shield is deployed to cover the handle, then security against forced entry is improved, but the device complexity increases
Solution Approach 1:
Instead of adding a shield that moves outward to cover the handle (traditional approach), the patent inverts the approach by having the lever itself move inward (retract) to achieve protection. This eliminates the need for a separate shield mechanism while achieving the same security objective.
Solution Approach 2:
The patent merges the protective function with the lever itself by enabling the lever to retract into a protected configuration. Rather than using a separate protective component, the lever's own movement provides the protection, combining multiple functions into a single component.
Data Source
AI summary
Disclosed herein is a self-protecting door handle assembly. The door handle assembly may retract a lever which prevents an operator from actuating the door handle assembly. While in a retracted configuration the lever may be restricted by a restricting surface. Additionally, the lever may be substantially flush to the baseplate while in the retracted configuration. While in the extended configuration the lever may be sufficiently distanced from the baseplate to allow an operator to grab and actuate the lever. In this configuration the lever may no longer be restricted by the restricting surface.