Weather-resistant lock
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Solution Overview
Problem
Pin tumbler locks are susceptible to torque attacks and weather conditions, which can render them inoperable by allowing liquid precipitation to enter and freeze within the lock cylinder.
Innovation Solution
The implementation of a sacrificial link and drainage system in the lock design, where a plastic coupling or tabs serve as a sacrificial component to fail under torque attack, preventing damage to the locking mechanism, and drainage features to expel liquid matter, ensuring the lock remains functional.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional pin tumbler lock is used, then the lock structure is simple and easy to manufacture, but the lock is susceptible to torque attacks and weather conditions
Solution Approach 1:
The lock is divided into separate functional components: a locking mechanism and a keyway assembly connected by a sacrificial link. This segmentation allows the locking mechanism to be protected from torque attacks while maintaining a relatively simple overall structure.
Solution Approach 2:
A sacrificial link (plastic coupling or tabs) is introduced as a disposable component that fails under torque attack to protect the expensive locking mechanism. This sacrificial element is replaced after failure, while the main locking mechanism remains intact and reusable.
2Reliability
If the keyway is directly connected to the locking mechanism, then the lock operation is simple, but torque attacks can dislodge the locking mechanism
Solution Approach 1:
A sacrificial link acts as an intermediary between the keyway and the locking mechanism. This intermediate component absorbs the impact of torque attacks, preventing direct transmission of damaging forces to the locking mechanism while still allowing normal key operation.
Solution Approach 2:
The sacrificial link is designed to fail before the locking mechanism can be damaged. This pre-planned failure mode cushions the locking mechanism against torque attacks, ensuring that any rotational force applied at the keyway is absorbed by the sacrificial component rather than the critical locking mechanism.
3Reliability
If drainage features are added to prevent water ingress, then weather resistance is improved, but the lock structure becomes more complex
Solution Approach 1:
The sacrificial link serves a dual function: it protects against torque attacks and acts as a weather seal. This thin film-like component prevents water and precipitation from entering the lock mechanism while maintaining structural integrity under normal conditions, eliminating the need for separate drainage systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The lock remains operable and resistant to torque attacks while preventing water ingress and freezing, maintaining functionality under adverse weather conditions.
Implementation Method 1
a sacrificial link configured to fail when a threshold torque is applied at the external keyway
Implementation Method 2
a drain in fluid communication with the external keyway, the drain configured to accommodate gravity-assisted drainage of fluid from the external keyway
Data Source
AI summary
A lock can include attack-resistant and/or weather-resistant features. Attack-resistant features can include a sacrificial link between a locking mechanism and an external keyway covering an exterior face of the locking mechanism. The sacrificial link can break during a torque attack on the lock such that the full force of the torque attack is not applied to the locking mechanism. Weather-resistant features can include drain openings in one or more housing components external to the locking mechanism to facilitate drainage of liquid matter from the lock before the liquid matter reaches the locking mechanism.