Handle Assembly Support Structure for Spindle Deflection Resistance
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Solution Overview
Problem
Existing handle assemblies can be tampered with by brute force, allowing unauthorized removal of the handle and lock core, compromising security even when the lock is in the locked position.
Innovation Solution
A support structure is integrated into the handle assembly to resist deflection of the spindle when the lock is in the locked position, preventing the handle from being forcibly removed by supporting the spindle and catch mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the handle is held in place on the sleeve by a catch mechanism that can be accessed through a hole, then the handle can be easily installed and serviced, but brute force can overcome the catch mechanism to remove the handle and lock core, compromising security
Solution Approach 1:
The invention divides the retention mechanism into two independent parts: the catch mechanism that enables easy installation and the support structure that provides security. The support structure is a separate component from the catch, allowing it to be optimized for security without interfering with the ease of installation function.
Solution Approach 2:
The support structure acts as an intermediary element between the handle and the sleeve. It provides additional retention strength without being part of the catch mechanism, thereby maintaining the ease of installation while preventing brute force removal.
2Ease of repair
If the catch mechanism is made accessible through a hole in the handle, then servicing and installation are simplified, but the handle becomes vulnerable to unauthorized removal when the lock is in the locked position
Solution Approach 1:
The invention separates the servicing function (catch mechanism) from the security function (support structure). The support structure is positioned to resist brute force attempts while the catch remains accessible through the hole for servicing purposes.
Solution Approach 2:
The support structure provides preliminary resistance against brute force attempts before the catch mechanism can be compromised. It creates a barrier that must be overcome in addition to the catch mechanism, thereby preventing unauthorized removal.
3Reliability
If additional security mechanisms are added to prevent brute force removal, then security is improved, but the device complexity increases
Solution Approach 1:
The invention merges the support structure with the existing sleeve and handle assembly. The support structure is positioned within the sleeve and works in conjunction with the catch mechanism, rather than being a completely separate system, thereby limiting the increase in complexity.
Solution Approach 2:
The support structure serves multiple functions: it provides security against brute force, maintains the locked position, and works in conjunction with the catch mechanism. This multi-functionality reduces the need for additional separate components.
Data Source
AI summary
A handle assembly includes a removable handle positioned over a sleeve. The handle assembly includes a catch positioned within the sleeve, and when extended, the catch prevents relative movement between the handle and the sleeve. The handle assembly includes a spindle positioned within the sleeve. The spindle has a longitudinal axis. The spindle is rotatable between a locked position and an unlocked position. When in the locked position, the sleeve is not rotatable, and when in the unlocked position, the sleeve is rotatable. The handle assembly includes a support structure that is configured to support the spindle. The support structure is in a fixed rotational relationship with respect to the handle. When the catch is in an extended position and the spindle is in the locked position, deflection of the spindle in a direction transverse to the longitudinal axis is resisted by way of the support structure.