Fire Sprinkler Shut-off Tool with Fusible Release Mechanism
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Solution Overview
Problem
Conventional fire sprinkler head shut-off tools are cumbersome, requiring two hands to operate, cannot be easily used on upright heads in confined spaces, and permanently deactivate the sprinkler, necessitating constant monitoring for potential rekindles.
Innovation Solution
A fire sprinkler shut-off tool with adjustable clamping arms and a fusible link locking mechanism that can be operated with one hand, automatically disengaging at a predetermined temperature to allow water flow to resume if the fire rekindles, and is designed for both pendant and upright sprinkler heads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional shut-off tool is used to stop water flow from an activated fire sprinkler head, then water flow is stopped, but the sprinkler head is permanently deactivated and requires constant monitoring for potential rekindles
Solution Approach 1:
The locking mechanism utilizes a fusible link that changes its physical state from solid to liquid at a predetermined temperature threshold. This parameter change allows the link to maintain the locked position at normal temperatures but automatically fail and release the clamping arms when the temperature exceeds the melting point, thereby automatically reactivating the sprinkler head without permanent deactivation.
2Ease of operation
If a shut-off tool requiring two hands to operate is used, then the tool can be operated, but safety is compromised when working from a ladder
Solution Approach 1:
The actuator assembly incorporates a camming member that converts rotational motion into linear motion, enabling the tool to be operated with one hand. The camming action allows the user to apply force through a single hand while the mechanism automatically positions the clamping arms, reducing the operational complexity and improving safety when working at heights.
3Adaptability or versatility
If a shut-off tool designed for inverted operation on upright sprinkler heads is used, then the tool can shut off upright heads, but it cannot be easily operated in confined spaces without room for inversion
Solution Approach 1:
The shut-off tool is designed with adjustable clamping arms that can adapt to different sprinkler head configurations including pendant, upright, and recessed types. The tool can be operated in various orientations without requiring inversion, making it universally applicable to different installation scenarios and confined spaces while maintaining the ability to effectively shut off water flow.
4Reliability
If a shut-off tool with a locking mechanism is used to maintain water flow stoppage, then water flow is prevented, but manual removal is required to resume flow if fire rekindles
Solution Approach 1:
The locking mechanism is designed to automatically release itself when the predetermined temperature threshold is exceeded. The fusible link melts at the threshold temperature, causing the locking mechanism to fail and the clamping arms to disengage automatically. This self-service feature eliminates the need for manual intervention to resume water flow, allowing the system to automatically respond to fire conditions.
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
Enables safe, one-handed operation of the shut-off tool, automatic reactivation of sprinklers if the fire rekindles, and compatibility with various sprinkler head configurations, reducing water damage and operational complexity.
Implementation Method 1
The locking mechanism and/or the movable arms include a fusible release portion selected to melt at a predetermined threshold temperature
Data Source
AI summary
The disclosed invention relates to a fire sprinkler shut-off tool for stopping water flow from an activated fire sprinkler head. Due to the lack of any automatic safety release mechanisms, such tools currently on market suffer the disadvantage of requiring constant monitoring in case fire rekindles. The shut-off tool comprising a pair of adjustable clamping arms and an actuator assembly for adjusting and fixing the clamping arms addresses the safety issue by integrating a fusible link locking tab into the actuator assembly. The presence of a nearby fire melts and separates the locking tab thereby releasing the clamping arms from an activated fire sprinkler head. The shut-off tool also addresses the safety problem of firemen or building maintenance personnel using a shut-off device that requires two hands while working from a ladder as this device can be easily used with one hand. The shut-off tool also achieves the object of universal fit on most fire sprinkler heads by use of the adjustable angled clamping arms and by locating a sealing surface on each of the clamping arms so as to permit operation with fire sprinklers mounted in an upright position.