Fire-resistant concealed door hinge
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United States of America Patent
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Aug 6, 2024
Grant Date -
May 18, 2023
app pub date -
Oct 21, 2022
filing date -
Oct 21, 2022
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A hinge has first and second leaf assemblies pivoted on each other and a link assembly interconnecting the first and second leaf assemblies. At least one of the first and second leaf assemblies has upper and lower mounts forming a cavity in which a respective end of the link assembly is pivoted, and at least one of the mounts of the one leaf assembly is formed with a recess opening into the cavity. According to the invention a body of foaming fire-protection material is provided in the recess so that when heated the body expands and fills the cavity with fire-protective foam.
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