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US 5,625,996 AGranted
Fire resistant wood box beam
OwnerFriend K. Bechtelinventor
Life of this patent
Estimating the term…
Abstract
A box beam has an interior and an exterior. Fire resistance is obtained by preventing the rapid progression of fire from the exterior to the interior. Fire resistant covers for the web elements and sufficiently sized wood flanges protect the interior of the beam, thus giving it improved fire safety. In some instances, longitudinal reinforcement elements embedded in protected areas of the flanges are desirable to provide additional stiffness and strength.
Claims10
An elongated fire resistant box beam having an interleaf portion and an exterior portion comprising:
- elongated upper and lower flange means each with a longitudinal axis, and a pair of planar panel web means;
- the tipper and lower flange means each comprised of a primary and secondary wooden flange member, the secondary flange being wider than the primary flange;
- the planar panel web means comprising at least one layer of fire resistant material, one of the web means being rigidily fastened to one edge the primary flange member of each of the upper and lower flange means, the other web means being rigidly fastened to, the opposite edge of the primary flange member of each of the upper and lower flange means, such that the primary flange member is located within the box beam's interior portion, and the secondary flange is located in the box beam's exterior portion, the resulting shape of the box beam being substantially rectangular in cross-section over the length of the box beam.
Dependencies are inferred from the claim text.