This 14 inch swing brace is a
workhorse for square-shank bits.
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The
shell
of the chuck bears two mostly illegible patent dates, but neither
date applies to the chuck. I cannot reconcile the fact that the
day in the lower month's date looks like "25."
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Another
brace, long since sold, had a more readable shell. The dates
on that brace's shell were Jan. 10, 1911 (US Patent No. 981,315) and
Apr. 11, 1911 (Patent No. 989,203):
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Above,
the chuck shaft has a flat that fits the "D" shape of the hole in the
cupped washer into which the screw fits.
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At
right, the wrist handle has recessed rings which ride on spigots
machined onto the thrust collars.
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