Integrated Theft-Resistant Guard for Roll-Up Door Lock Mechanisms
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Solution Overview
Problem
Existing roll-up door lock mechanisms are vulnerable to theft, as removable anti-theft shields often interfere with operation, get damaged, lost, or forgotten, and do not provide a permanent deterrent.
Innovation Solution
A non-removable theft-resistant guard is integrated with the lock mechanism, featuring a plate-like member with tab portions and a brace, secured to the latch cam, handle, and hold-closed keeper, ensuring it moves with the handle and cannot be easily removed, providing a permanent deterrent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a removable anti-theft shield is added to an existing door lock, then theft resistance is improved, but ease of operation deteriorates because the shield interferes with the free operation of the lock mechanism
Solution Approach 1:
The guard is integrated with the lock mechanism components (latch cam, handle, hold-closed keeper) to form a unified assembly. The guard moves together with these components during normal operation, eliminating the need for separate removable shields while maintaining theft resistance and operational ease.
2Reliability
If a removable anti-theft shield is added to an existing door lock, then theft resistance is improved, but reliability deteriorates because the shield can be damaged, lost, or stolen
Solution Approach 1:
The guard is permanently integrated with the lock mechanism components through movement integration. The guard moves together with the latch cam, handle, and hold-closed keeper as a unified assembly, eliminating the possibility of the guard being separated, lost, or stolen while maintaining its theft-resistant function.
3Reliability
If a non-removable guard is integrated with the lock mechanism, then reliability is improved by preventing removal, but device complexity increases due to integration requirements
Solution Approach 1:
The guard is integrated with existing lock mechanism components (latch cam, handle, hold-closed keeper) that already move together during operation. By utilizing the existing coordinated movement of these components, the guard becomes part of the established mechanism without requiring additional complex control systems or actuation mechanisms.
Solution Approach 2:
The guard serves multiple functions: it acts as a theft deterrent by surrounding critical components, moves with the lock mechanism during normal operation, and integrates with the existing structural elements of the door assembly. This multi-functionality reduces the need for separate dedicated systems.
Data Source
AI summary
The present invention broadly provides a theft-resistant guard (20) for a roll-up door lock mechanism (21). The improvement broadly comprises: the guard (20) being non-removably mounted on the lock mechanism (21) for movement with the handle (29). The guard has a proximal marginal end portion (34) arranged to partially embrace the pivotal connection between the latch cam (24) and plate (23), has an intermediate portion (35) adapted to partially embrace the handle, and has a distal marginal end portion (36) adapted to partially embrace the hold-closed keeper (32) when the handle is in the closed position, such that the guard may not be readily removed from the lock mechanism.