Renze
Elite Member
"In modern times, the first light wood frame roof trusses were built on the construction site using nailed boards or plywood gusset truss plates at the joints. Use of these early roof trusses offered longer spans, more cheaply, than un-trussed lumber but took a long time to build on the construction site. In 1952, in Pompano Beach Florida, after experimenting with plywood gusset truss plates and varying concoctions and combinations of glue, staples, nails and screws, the metal truss plate connected engineered wood truss was invented and patented."I didn't spend a lot of time looking, but here's a link.
Truss Component Services - Truss Plates / Pallet Plates
They are Truss Plates. Metal that is cut so the cut out metal acts kind of like nails to hold the wood together. They are very common here and part of the Engineers Stamp when buying engineered trusses.
Eddie
Sometimes it seems like in certain fields of engineering, Europe is living in another century than America.. But in other fields of engineering, it seems its the other way around...
We still use plywood gussets
We do know this kind of stamped metal strips with nails stamped out of the metal itself, in a different application: I use them only to repair a crack in my wooden shoes