In rec.crafts.metalworking, Leon Fisk wrote:
FWIW I found a patent that looks very similar to this item,
Patent No. 886,394. See:

http://www.google.com/patents?id=s7V...intsec=drawing

I only gave it a cursory look, but I think the usage is explained...

I can't recall reading a clearer patent. Most patents are written in
a strangely stilted, obfuscated manner, but not this one. This is how
a patent should be written. Here's a bit of the OCRed text google has,
the original image is easier for me to read ("Bang of Great Britain"?
the text says "King...") but not so cut-n-pastable.

Be it known that I, George Edward Morris, a subject of the Bang of
Great Britain, residing at Regina, in the Province of 5
Saskatchewan, Canada, have invented certain new and useful
Improvements in Beading Implements; and I do hereby declare that the
following is a full, clear, and exact description of the invention,
such as will enable others skilled in the art to which it appertains
to make and use the same.

My invention relates to tube expanding and beading tools.

The object of my invention is to provide a tool which will properly
expand the end of a tube and form a bead thereon in one movement,
and which will be rotated by the operation of an impacting element.

A more specific object is to provide a pivot ally mounted supporting
plate with a rotatable head carrying a suitable tool; and, further,
to provide means on the head for normally maintaining the tool in
raised position in the path of movement of the impact ing element,
and for guiding the tool so that the tube operated on is expanded by
a blow almost at right angles to the plate to which the tube is
being attached. The advantage sought to be attained by this
construction is that more or less unskilled operators may use the
tool and produce proper work.

Elijah
------
"more or less unskilled operators may use the tool"