Spring-Loaded Locking Slide for Fire Hydrant Nozzle Theft Prevention
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Solution Overview
Problem
Conventional fire hydrant nozzles are prone to theft due to their valuable copper alloy material, and existing locking mechanisms are cumbersome and require manual intervention, posing risks during use under pressure.
Innovation Solution
A removable fire hydrant nozzle with a spring-loaded locking slide that automatically engages and disengages when the nozzle is seated, providing secure locking without operator intervention and facilitating single-handed installation and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional quarter-turn fitting with a spring steel locking tab is used, then the nozzle can be securely locked to the hydrant, but the installation and removal process becomes cumbersome requiring manual manipulation of the locking tab
Solution Approach 1:
The locking system is designed to automatically engage and disengage without requiring manual manipulation. During installation, the locking tab automatically springs into the locked position when the nozzle is rotated into place. During removal, the release lever allows automatic disengagement of the locking tab, eliminating the need for manual tab manipulation while maintaining secure locking
Solution Approach 2:
The locking system transitions from a static locked position to a dynamic state during operation. The spring-loaded locking tab provides automatic engagement through elastic deformation, and the release lever enables controlled disengagement. This dynamic behavior allows the system to adapt between securely locked and easily removed states
2Object-affected harmful factors
If the nozzle is made removable to prevent theft, then copper alloy material value is protected, but the risk of accidental separation during use under pressure increases
Solution Approach 1:
The locking system uses a spring-loaded tab that can be repeatedly engaged and disengaged, providing temporary but reliable attachment. The nozzle can be quickly removed when not in use to prevent theft, yet locks securely during use to prevent accidental separation. The system prioritizes security during operation while allowing easy removal when idle
Solution Approach 2:
The locking tab acts as an intermediary element between the nozzle and hydrant. It provides a mechanical connection that can be automatically engaged for secure attachment during use, yet easily disengaged for removal to prevent theft. The tab mediates between the need for secure attachment and the need for easy removal
3Extent of automation
If a spring-loaded locking mechanism is used, then automatic engagement is achieved, but the device complexity increases compared to simple set screw locking
Solution Approach 1:
The locking system is divided into distinct functional components: a spring-loaded locking tab for automatic engagement, a release lever for disengagement, and guide rails for controlled movement. This segmentation allows each component to perform its specific function while keeping the overall design relatively simple and maintainable
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 solution provides a robust, easy-to-use locking system that securely attaches the nozzle to the hydrant without manual manipulation, preventing theft and ensuring the nozzle remains attached during use, even under pressure.
Implementation Method 1
The slide is spring loaded and is capable of axial movement between extended and retracted positions
Data Source
AI summary
A removable hydrant nozzle with a locking arrangement for securing the nozzle in a nozzle opening. The locking arrangement includes an axially movable slide configured to selectively engage a portion of the hydrant adjacent the nozzle opening, such as a lug mouth in a quarter-turn fitting. The slide is mounted to a slide housing and is spring loaded. In use, the slide automatically retracts as the nozzle is inserted into the nozzle opening and automatically extends into locking engagement with the mouth when the nozzle becomes fully seated. Once engaged, the slide prevents removal of the nozzle until manually disengaged. The slide may be movably mounted on a pair of shoulder bolts. The slide may include a paddle that extends outwardly where it is accessible to the operator. The nozzle may include a handle and a seal fitted onto the inner axial end of the nozzle.