Weather Resistant Lock Drainway and Hood Design
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Solution Overview
Problem
Pin tumbler locks are prone to weather-related failures such as water ingress, corrosion, and freezing issues when used outdoors, leading to operational failures and potential damage.
Innovation Solution
A weather-resistant keyed cylindrical lock design featuring a rotatable core with an elevated pinway, a hood acting as a water barrier, and a drainway to channel water outwardly, along with water-resistant seals and an asymmetrical shell profile for improved water resistance and ice management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional pin tumbler lock is used in outdoor locations, then the lock structure is simple and easy to manufacture, but the lock is prone to water ingress, corrosion, and freezing issues
Solution Approach 1:
The lock is divided into multiple functional components: a cylindrical shell, a rotatable core, an elevated pinway assembly, a hood, and a drainway system. Each component serves a specific function in preventing water ingress and managing moisture, allowing the complex weather resistance features to be systematically integrated without overwhelming manufacturing complexity
Solution Approach 2:
The hood acts as an intermediary water barrier component that covers the elevated pinway and prevents direct water access to the pin chambers. The drainway serves as an intermediary drainage path that channels water away from critical lock components, mediating between potential water sources and the lock mechanism
2Object-affected harmful factors
If water drainage features are added to prevent water accumulation, then water resistance is improved, but the lock structure becomes more complex
Solution Approach 1:
The drainway is strategically positioned at specific locations within the lock structure where water accumulation is most likely to occur, such as the bottom of the cylindrical shell and near the keyway. This localized approach to drainage provides effective water management without requiring a complex system throughout the entire lock
Solution Approach 2:
The elevated pinway is positioned at a higher vertical dimension within the lock structure, above the drainway opening. This dimensional arrangement allows water to naturally drain away from the pin chambers through gravity, using spatial positioning rather than complex mechanical drainage components
3Reliability
If the dust cover is made to fully close for security, then protection is improved, but ice buildup can prevent opening
Solution Approach 1:
The dust cover is designed as a separate, removable component that can be independently opened without affecting the main lock mechanism or core. This extraction of the dust cover function allows it to be opened separately to prevent ice buildup, while maintaining full closure for protection when not in use
Solution Approach 2:
The dust cover can be opened preliminarily before attempting to operate the main lock mechanism in cold weather. This preliminary action allows users to clear ice or snow from the keyway and surrounding areas before inserting and turning the key, preventing operational failures
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 design effectively prevents water ingress and ice buildup, ensuring the lock remains operational in adverse weather conditions by creating a water-resistant barrier and efficient drainage system, reducing the risk of corrosion and freezing-related failures.
Implementation Method 1
a drainway to channel water outwardly
Implementation Method 2
a hood acting as a water barrier
Data Source
AI summary
A weather resistant tumbler lock has an elongated body, and defines a longitudinal axis. The lock is interchangeable with another lock having a corresponding asymmetrical perimeter profile with an opening in a top surface sealed with a cap, the other lock having a different rotatable core and a different configuration of tumblers. A drainway provides a channel for water to flow outwardly from the interior of a shell housing, a rotatable core and a keyway within the core, to a drain below the lock. The drain connects to a channel through a lower edge. The core provides an arcuate gap in a lower quadrant adjacent the interior surface of the shell for fluid communication with the drainway. A method includes identifying a substitute tumbler lock with an impermeable outer wall for replacing another lock having an identical outer perimeter profile and a permeable closed opening on its top surface.