View Single Post
  #17   Report Post  
Posted to rec.crafts.metalworking
Leon Fisk[_2_] Leon Fisk[_2_] is offline
external usenet poster
 
Posts: 172
Default unusual threading die adjustment

On Wed, 1 Aug 2018 14:07:01 -0400
"Jim Wilkins" wrote:

snip
I have an old Jacobs drill chuck, normal-looking except that the
sleeve is diamond knurled, with the patent date "SEP 16 1902" stamped
on it.


That's an older one for sure. From what I can suss out it looks to be
the beginnings of what we consider to be a standard keyed chuck
nowadays.

https://patents.google.com/patent/US709014A/en

It looks like that patent was still being cited in the early 2000's...

--
Leon Fisk
Grand Rapids MI