Plastic Shaft Fastener With Metal Catch for Fire-Safe Insulation
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Solution Overview
Problem
Fastening devices with metal shanks efficiently dissipate heat, increasing heating energy in buildings and posing a fire hazard as they fail, causing attached objects to fall and endanger residents and rescuers.
Innovation Solution
A fastening device with a plastic shaft and a metal safety catch that separates mechanical loads during normal operation and in case of failure, reducing thermal conductivity and preventing falling objects by absorbing forces along its longitudinal direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shank is made of metal, then the mechanical strength and fire resistance are improved, but the thermal conductivity increases causing heat loss from the building
Solution Approach 1:
The fastening device is divided into two separate functional components: a plastic shank for thermal insulation and a metal safety catch for fire resistance and mechanical strength. This segmentation allows each component to optimize its material properties without compromising the other function.
Solution Approach 2:
The device uses a composite structure combining plastic (for low thermal conductivity) and metal (for high strength and fire resistance). The plastic shank reduces heat flow while the metal safety catch provides structural integrity and fireproofing, creating a composite system that achieves both thermal insulation and fire resistance.
2Loss of energy
If the shank is made of plastic, then the thermal conductivity is reduced improving thermal insulation, but the fire resistance deteriorates as the plastic fails in fire events
Solution Approach 1:
The fastening device is divided into two separate functional components: a plastic shank for thermal insulation and a metal safety catch for fire resistance and mechanical strength. This segmentation allows each component to optimize its material properties without compromising the other function.
Solution Approach 2:
The metal safety catch acts as an intermediary backup system that activates when the plastic shank fails during fire. It provides a secondary load-bearing path that ensures continued support of the facade element even when the primary plastic shank deteriorates from heat exposure.
3Loss of energy
If the shank is made of plastic, then the thermal conductivity is reduced, but the mechanical strength and reliability under load deteriorate
Solution Approach 1:
The device uses a composite structure combining plastic (for low thermal conductivity) and metal (for high strength and fire resistance). The plastic shank reduces heat flow while the metal safety catch provides structural integrity and fire resistance, creating a composite system that achieves both thermal insulation and fire resistance.
Solution Approach 2:
The metal safety catch is pre-installed as a backup mechanism that remains dormant during normal operation but activates automatically when the plastic shank fails. This prior cushioning ensures that mechanical strength is maintained even when the primary load-bearing component deteriorates.
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 effectively reduces heat flow into and out of buildings while ensuring the safety of attached objects by preventing them from falling in case of shaft failure, thus enhancing both thermal insulation and fire safety.
Implementation Method 1
the shaft is made of plastic... Due to the production from optionally fiber-reinforced plastic, the shaft has a comparatively low thermal conductivity and a high thermal resistance
Implementation Method 2
a metal safety catch that separates mechanical loads during normal operation and in case of failure, reducing thermal conductivity and preventing falling objects by absorbing forces along its longitudinal direction
Data Source
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AI summary
The invention relates to a fastening device (1) for mounting an object (4) to a building (3), comprising a shaft (10) with a first end (11) and a second end (12), wherein the shaft (10) is configured to transmit forces introduced by the object (4) into the fastening device (1) via the building (3), wherein a catch device (2) extends along the shaft (10) and is configured to transmit the forces introduced by the object (4) into the fastening device (1) via the building (3) in the event of failure of the shaft (10), wherein the catch device (2) has a greater length and/or a smaller cross-sectional area than the shaft (10). The invention further relates to methods for manufacturing and using such a fastening device.