Acute-Angle Tapered Door Handle Resists Locking Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Door handles in building spaces are vulnerable to unauthorized locking or securing, which can restrict access intended for public safety.
Innovation Solution
A door handle design featuring a flat grip extending at an acute angle with a tapering width and edge, preventing locking devices from attaching by urging them downward as the door opens, and optionally rotatable to increase the angle of resistance, paired for use on adjacent doors to prevent between-grip attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional door handle is used, then it is easy to operate and provides good accessibility, but it can be easily locked or secured to another handle or object by unauthorized persons
Solution Approach 1:
The door handle grip features an asymmetric tapered cross-section with a narrower width at one end and a wider width at the other end. This asymmetric geometry prevents locking devices from being properly positioned around the handle, as the tapering shape does not provide a uniform surface for cuffs or restraints to secure to, thereby resisting unauthorized locking while maintaining normal operation
Solution Approach 2:
The door handle incorporates rotatability, allowing the grip to rotate relative to the door handle plate. This dynamic feature increases the angle of the grip edge with respect to vertical, further preventing locking devices from being attached. The rotation capability adds adaptability to prevent unauthorized securing while preserving ease of operation
2Reliability
If a door handle with locking resistance features is used, then unauthorized locking is prevented, but the handle design becomes more complex
Solution Approach 1:
The anti-locking features are localized to specific geometric characteristics of the handle grip (the tapered cross-section and acute angle edge) rather than requiring complex mechanical mechanisms. This local quality approach prevents unauthorized locking through intelligent shape design while keeping the overall device simple and avoiding excessive complexity
3Reliability
If a tapered grip design is used, then locking devices are urged downward and attachment is resisted, but manufacturing precision requirements increase
Solution Approach 1:
The invention utilizes specific geometric parameters (taper angle, acute angle of grip edge, width ratios) that are optimized to provide effective anti-locking functionality. By carefully selecting these parameters, the design achieves reliable prevention of locking device attachment while maintaining manufacturability within standard precision tolerances
Data Source
AI summary
A door handle pull securable to a surface of a door hinged on one edge thereof, for preventing the securing of lockable items thereto, the door handle pull. The door handle pull comprises a flat door handle grip extending from the door at an acute angle with respect to the door surface and in a direction away from the door surface, the door handle grip having a width tapering from a wider width adjacent the door to a narrower width near a distal end with an edge on the hinge side of the door extending at an acute angle to vertical. The tapered width of the grip and acute angle of the grip edge resists attachment of a locking device to the grip and urges a locking device downward off of the grips as the door is opened and the locking device is tightened.