- West of the Severn UK
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Hi Andy,I've been mucking around with TurboCAD (Platinum unfortunately) and I was able to create this in less than an hour.
Very good -- so far.
Chair screws have a tapered square head. Below that is a pan flange, which is larger than the tapered oak ferrule which locates in the tapered hole in the casting:
The ferrule provides a precise location on the timber without needing a close tolerance hole in the casting. The ferrule stands proud of the casting to be effective. If frequent tightening cause the screw to contact the casting, the ferrule must be replaced. Different sizes of ferrule are available for maintenance purposes. Modern ferrules are no longer oak, but a tough plastic polymer.
This is Templot's generated geometrical version of that, I think the flange could be beefed up a bit.:
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