Lock Assembly Secured Setscrew Configuration
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Solution Overview
Problem
Existing door lock configurations allow for easy removal of handles using simple tools, posing a risk of unauthorized access and tampering.
Innovation Solution
A lock assembly with a secured setscrew configuration, featuring a keyed lock core and tailpiece that obstructs access to the setscrew, requiring authorized access to prevent handle removal, combined with a coupling mechanism that securely fastens the handle to the lock assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the handle is secured with a setscrew accessible through the handle, then the handle can be easily removed with simple tools, but security against unauthorized removal is compromised
Solution Approach 1:
The patent divides the access path into two separate routes: a first access path through the handle body for authorized operation, and a second access path through the lock core for authorized service access. The setscrew is positioned to be accessible only through the second path, separating the functions of normal operation and secure removal.
Solution Approach 2:
The lock core acts as an intermediary mechanism between the handle and the setscrew. The tailpiece of the lock core blocks the first access path when inserted, and the service access hole in the lock core provides a controlled second path. This intermediary structure ensures only authorized individuals can access the setscrew.
2Reliability
If the setscrew is made secure and inaccessible, then unauthorized removal is prevented, but service access for handle replacement becomes difficult
Solution Approach 1:
The patent creates segmented access paths: the first path through the handle body is blocked by the lock core tailpiece for security, while the second path through the service access hole in the lock core remains open for authorized service. This segmentation allows secure storage of the setscrew while maintaining serviceability.
Solution Approach 2:
The lock core is pre-configured with a service access hole that provides predetermined access to the setscrew for authorized service. The tailpiece is positioned to block the main access path during normal operation, but the pre-planned service hole allows easy access when needed, eliminating the need to disassemble the entire lockset.
3Reliability
If the lock core tailpiece blocks the access path, then unauthorized access to the setscrew is prevented, but the structure becomes more complex
Solution Approach 1:
The patent merges the blocking function and the access function into a single integrated structure. The lock core tailpiece serves dual purposes: it blocks the first access path when inserted for security, and simultaneously provides the service access hole for authorized service. This merging eliminates the need for separate blocking mechanisms and additional components.
Data Source
AI summary
A lock assembly includes a coupling mechanism connected to a spindle assembly. The coupling mechanism has an outer sleeve having a longitudinal interior opening that extends along a first axis. An operator handle includes a proximal lock core opening, and a distal shaft portion having an axial opening configured to receive the outer sleeve. The distal shaft portion and the outer sleeve are configured to define a through path oriented across the longitudinal interior opening of the outer sleeve. A portion of the through path at the outer sleeve is configured to threadably receive a setscrew to fasten the operator handle to the outer sleeve. A keyed lock core has a tailpiece that is positioned in the longitudinal interior opening of the outer sleeve to obstruct the through path and block access to the setscrew via the through path to prevent unauthorized removal of the operator handle.