AN IMPROVEMENT IN LATHES FOR TURNING BOLTS, SCREWS, AND OTHER SMALL ARTICLES IN METAL
Year: 1857

page_text: LETTERS PATENT to Ebenezer Coleman, of Dudley, in the County of
Worcester, for the Invention of "AN IMPROVEMENT IN LATHES FOR TURNING
BOLTS, SCREWS, AND OTHER SMALL ARTICLES IN METAL."
Sealed the 11th May 1858, and dated the 12th November 1857.
PROVISIONAL SPECIFICATION left by the said Ebenezer Coleman, at
the Office of the Commissioners of Patents, with his Petition, on the
12th November 1857..
I, EBENEZER COLEMAN, of Dudley, in the County of Worcester, do hereby
declare the nature of the said Invention for "AN IMPROVEMENT IN LATHES FOR
TURNING BOLTS, SCREWS, AND OTHER SMALL ARTICLES IN METAL," to be as
follows:-
or.
This Invention consists of a spring chuck for holding the bolt, screw, or
other article to be turned, which is so arranged and constructed as to allow of
the article being removed and another substituted without stopping the revo-
lution of the lathe. The end of the chuck is so formed as to embrace or
otherwise hold the head of the bolt, screw, or other article, and is furnished
with a square bar or tail-piece passing through the mandrel of the lathe.
(which is hollow) and turning with it, or the bar may be round and slide on a
feather and groove. The chuck is pressed forward by means of a spiral spring
acting between a collar on the bar and the end of the mandrel, and is with-:

page_text: drawn by means of a lever acted upon by a treadle when it is desired to
remove the bolt, screw, or other article, and to substitute another in its
place.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Ebenezer Coleman in the Great Seal Patent Office on the
12th May 1858.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, EBENEZER
COLEMAN, of Dudley, in the County of Worcester, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twelfth day of November, in the year of our
Lord One thousand eight hundred and fifty-seven, in the twenty-first year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto
me, the said Ebenezer Coleman, Her special licence that I, the said
Ebenezer Coleman, my executors, administrators, and assigns, or such others
as I, the said Ebenezer Coleman, my executors, administrators, and assigns,
should at any time agree with, and no others, from time to time and at all
times thereafter during the term therein expressed, should and lawfully might
make, use, exercise, and vend, within the United Kingdom of Great Britain
and Ireland, the Channel Islands, and Isle of Man, an Invention for "AN
IMPROVEMENT IN LATHES FOR TURNING BOLTS, SCREWS, AND OTHER SMALL ARTICLES
IN METAL," upon the condition (amongst others) that I, the said Ebenezer
Coleman, my executors or administrators, by an instrument in writing under
my, or their, or one of their hands and seals, should particularly describe and
ascertain the nature of the said Invention, and in what manner the same was
to be performed, and cause the same to be filed in the Great Seal Patent
Office within six calendar months next and immediately after the date of the
said Letters Patent.
NOW KNOW YE, that I, the said Ebenezer Coleman, do hereby declare
the nature of the said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement in writing, & on reference to the accompanying Sheet of Drawings,
that is to say :-
My Invention consists of a spring chuck for holding the bolt, screw; or.
other article to be turned, which is so arranged and constructed as to allow of
the article being removed and another substituted without stopping the re-.

page_text: volution of the lathe. The end of the chuck is so formed as to embrace or
hold the head of the bolt, screw, or other article, and is furnished with a square
bar or tail piece passing through the mandrel of the lathe (which is hollow)
and turning with it, or the bar may be round and slide on a feather and
groove. The chuck is kept.closed by means of a spiral spring acting between
a collar on the bar and the end of the mandrel, and is opened by means of a
lever acted upon by a treadle when it is desired to remove the bolt, screw, or
other article, and to substitute another in its place.
Such being the nature and object of my said Invention, I will proceed to
describe more in detail the manner of carrying the same into practical effect,
and in order that the same may be perfectly understood, I have annexed
hereunto a Sheet of Drawings illustrative thereof, and have marked the same
with figures and letters of reference corresponding with those in the following
explanation thereof :-
Figure is a plan view of the headstock, mandrel and chuck. Figure 2 is
a side view, and Figure 3 is an end view of the same. Figure 4 shews a plan
and side view of the spring chuck. A, A, is the headstock, supporting in
suitable bearings the mandrel B, B. This mandrel is furnished with a pulley
C, and is hollow, having a rectangular opening throughout its entire length.
In this opening the spring chuck D, D, is placed. This chuck is made some-
what in the form of spring tongs, being self-expanding, and is rectangular in
its exterior form, excepting the tail-piece E, which is rounded. The head of
the chuck is formed slightly conical or taper, and it will be evident that upon
the chuck being drawn or forced into the mandrel the jaws of the chuck will
be closed, and caused to hold any bolt, screw, or other small article that may
have been placed between them. The chuck is drawn inwards and held in
that position by a spiral spring F, F, acting between the end of the mandrel
and the collar G, which is fixed to the tail-piece; H, H, is a lever fixed to
one end of a rocking shaft I, I, upon which is also keyed a lever J. The upper
end of this lever carries a set screw or pin K, acting against the tail-piece of
the chuck. The lever H, H, is connected to a treadle, and when the end H
is depressed thereby, the lever J will be thrust forwards, and by means of the
pin K will force the chuck D, D, outwards, allowing it to expand and release
the bolt. When this bolt has been withdrawn and another substituted, the
treadle is released, and the spring F, F, acting upon the collar G, will draw
the chuck into the mandrel, and thus close the jaws upon the bolt.
Having thus described the nature and object of my said Invention of an
improvement in lathes for turning bolts, screws, or other small articles in
:

page_text: metal, together with the manner of carrying the same into practical effect, I
would remark, in conclusion, that I claim as my. Invention the adaptation to
such lathes of a spring chuck as shewn in the Drawings and above described,
or any mere modification thereof, for holding and releasing bolts, screws, and
other small articles without stopping the revolution of the lathe.
In witness whereof, I, the said Ebenezer Coleman, have hereunto set my
hand and seal, this Eleventh day of May, in the year of our Lord'
One thousand eight hundred and fifty-eight.
EBENEZER COLEMAN. (L.S.)
Witness,
ALFRED PUCKLE, Agent,
29, Paradise St., Birmingham.