Fire Protection Sleeve Snap-In Holder Design
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Solution Overview
Problem
Existing fire protection sleeves with intumescent inserts face complex and unreliable assembly processes due to protruding fastening hooks that interfere with the intumescent material's expansion and provide insecure connections.
Innovation Solution
A fire protection sleeve with a housing and holders attached via a snap-in connection, utilizing latching hooks that do not enter the interior, allowing for easy and secure attachment without obstructing the intumescent insert's expansion, and featuring a design that ensures a stable hold through prestressed latching hooks and positioning projections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hooks are used to fasten the fire protection sleeve to the substrate, then the assembly can be securely attached, but the hooks reach into the interior and contact the cable, preventing the intumescent insert from spreading undisturbed
Solution Approach 1:
The harmful function of the hooks reaching into the interior is eliminated by extracting this intrusive feature. The patent replaces interior-reaching hooks with exterior-mounted holders that attach to the outer circumference of the housing, completely removing the source of obstruction to intumescent insert expansion while maintaining secure attachment functionality.
Solution Approach 2:
The attachment mechanism is relocated from the interior dimension to the exterior dimension. Instead of hooks reaching inward from the interior, the holders are mounted on the outer circumference and extend outward to engage with the substrate, changing the spatial dimension of the attachment function and eliminating interference with the intumescent insert.
2Reliability
If hooks are provided for fastening the fire protection sleeve, then attachment to substrate is possible, but the assembly of the cuff becomes very complex requiring adjustment of circumference and attachment of hooks simultaneously
Solution Approach 1:
The attachment function is segmented into separate components: holders mounted on the outer circumference and hooks that engage with the substrate independently. This segmentation allows the circumference adjustment and hook attachment to be performed as separate, simpler operations rather than a complex simultaneous process.
Solution Approach 2:
The holders are pre-mounted on the outer circumference of the housing before final assembly. This preliminary action allows the circumference to be adjusted and secured independently, and then the hooks are subsequently attached to engage with the substrate, simplifying the overall assembly sequence.
3Reliability
If fastening hooks are slid in axially into means for receiving hooks on the outer circumference, then attachment is possible, but a secure connection is only established in one direction while the housing can be pushed against the hooks in the other direction
Solution Approach 1:
The connection mechanism employs asymmetric design where the holders mounted on the outer circumference have a specific orientation and engagement geometry that provides secure attachment in both directions. The holders are designed with features that prevent the housing from being pushed off in either axial direction, creating bidirectional stability through asymmetric structural features.
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
Facilitates simple, reliable, and secure assembly of the fire protection sleeve, ensuring the intumescent insert can expand freely to seal openings effectively while maintaining a secure attachment to the substrate, preventing smoke and fire spread.
Implementation Method 1
The holder has at least two latching hooks. These can be directed towards each other so that they are pushed away from each other when the holder is mounted on the housing. Alternatively, the latching hooks can be directed away from one another, so that they are pressed towards one another. As a result, the latching hooks are prestressed against one another when they are placed on an abutment provided on the housing
Implementation Method 2
When it is very hot, for example in the event of a fire, the intumescent insert expands, hermetically sealing the wall opening and thus preventing fire or smoke from spreading through the wall opening
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
In a fire protection collar (10) with a housing (14) that can accommodate an insert of intumescent fire-resistant material (16) and at least one holder (18) with which the housing (14) can be attached to a substrate, it is provided that the holder (18) is attached to the housing (14) by means of a snap connection, which is made by a movement of the holder (18) from the outside towards the center of the housing (14).