Institutional Sprinkler Housing With Recessed Trigger Protection
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Solution Overview
Problem
Institutional sprinklers are vulnerable to intentional or accidental damage due to the exposure of the thermally responsive trigger, which can lead to unintentional operation during storage, transport, or installation, and existing protective devices complicate the installation process.
Innovation Solution
A protective cap arrangement for institutional sprinklers that encloses the thermally responsive trigger within the sprinkler housing, allowing for tool engagement and protection during installation, while maintaining the sprinkler's compact profile and preventing access to internal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the thermally responsive trigger is exposed at the periphery of the sprinkler housing, then the trigger can be accessed for installation and maintenance, but the trigger becomes vulnerable to intentional tampering and accidental impact damage
Solution Approach 1:
The patent applies nesting by placing the trigger inside a recessed cavity within the sprinkler housing, effectively nesting the vulnerable component within a protective structure. The trigger is positioned in a recess that requires deliberate access, preventing accidental impact while maintaining accessibility for authorized installation and maintenance activities.
2Reliability
If protective devices or covers are added to shield the trigger during storage and shipment, then the trigger is protected from damage, but the protective devices must be removed during installation which complicates the installation process
Solution Approach 1:
The patent merges the protective function directly into the housing structure by creating an integrated recess that shields the trigger. This eliminates the need for separate removable protective covers, as the housing itself provides continuous protection during storage, transport, and installation while requiring no additional components to be added or removed.
Solution Approach 2:
The housing structure serves dual purposes: it provides structural support and simultaneously protects the trigger through its recessed design. The housing performs the protective function that would otherwise require separate protective devices, simplifying the overall system and installation process.
3Reliability
If the sprinkler is designed with minimal access points into the housing, then intentional tampering is minimized, but access to internal components for installation and maintenance becomes more difficult
Solution Approach 1:
The patent applies local quality by creating a specifically designed recessed area within the housing that provides controlled access to the trigger. This localized access point maintains the overall minimal access design for tamper resistance while providing sufficient access for authorized installation and maintenance activities at the specific location where it is needed.
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 protective cap effectively shields the trigger from impact and tampering, ensuring the sprinkler remains functional and intact during storage, transport, and installation, while facilitating easy installation without the need to remove protective covers.
Implementation Method 1
In response to a sufficient level of heat from a fire or other thermal event, the thermally responsive trigger operates or actuates
Implementation Method 2
Upon thermal actuation, the fusible link separates to permit the pins and the deflector to move in an outward direction
Data Source
Figure 1
Figure 2
Figure 2A~2B
AI summary
Institutional sprinkler assemblies are provided that includes a sprinkler housing and protective cap arrangement to protect a thermally responsive shielding trigger. The sprinkler housing and trigger arrangement provide for an annular buffer to protect the trigger. The institutional sprinkler assemblies include configurations for installation in pendent and horizontal and orientations.