IMPROVEMENTS IN BORING OR TURNING MILLS FOR OPERATING IN METALS OR STONE
Year: 1857

page_text: LETTERS PATENT to William Sellers, of the City of Philadelphia, in the
State of Pennsylvania, United States of America, for the Invention of
"IMPROVEMENTS IN BORING OR TURNING MILLS FOR OPERATING IN METALS
OR STONE."
Sealed the 9th February 1858, and dated the 7th September 1857.
PROVISIONAL SPECIFICATION left by the said William Sellers at the
Office of the Commisioners of Patents, with his Petition, on the 7th
September 1857.
I, WILLIAM SELLERS, of the City of Philadelphia, in the State of Penn-
sylvania, United States of America, do hereby declare the nature of the
said Invention for "IMPROVEMENTS IN BORING OR TURNING MILLS FOR OPERATING
IN METALS OR STONE," to be as follows:-
I provide a suitable bed plate, on which is a circular V-formed groove, and
above said bed plate I provide a circular bed having a circular V-formed rib
near its edge, coinciding and setting within the aforesaid V-formed groove. In
the centre of said circular bed I form a spindle that sets within a barrel,
which is made with or firmly attached to the bed plate, and within said barrel
I make use of a step that receives the lower end of the aforesaid spindle; and
the said circular bed is made to take more or less of a bearing in the said
V-formed groove by adjusting this step by means of screws applied direct, or
through a cross bar. The surface of the said circular bed is provided with

page_text: suitable grooves and similar devices for attaching, by bolts or otherwise, any
article to be bored or turned; and the said bed is revolved by competent power
through suitable gearing, and brings the article attached on said bed in con-
tact with a suitable boring or turning tool mounted on a slide rest or similar
device over the aforesaid bed. By this mill I am enabled to dispense with
the face chucks and long supporting shafts now generally in use, and my bed
is very solid in consequence of running in the V-formed groove.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Sellers in the Great Seal Patent Office, on the
6th March 1858.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
SELLERS, of the City of Philadelphia, in the State of Pennsylvania, United
States of America, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Seventh day of September, 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 William Sellers, Her special license, that I, the said William Sellers, my
executors, administrators, and assigns, or such others as I, the said William
Sellers, 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 "IMPROVEMENTS IN BORING OR TURNING MILLS
FOR OPERATING IN METALS OR STONE," upon the condition (amongst others) that
I, the said William Sellers, by an instrument in writing under my hand and
seal, should particularly describe and ascertain the nature of the said Inven-
tion, 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 William Sellers, 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,
reference being had to the Drawings hereunto annexed, and to the letters and
figures marked thereon (that is to say) :-
Fig. 1 is a side view; Fig. 2 is a cross section through the centre of the
spindle; Fig. 8 is a longitudinal section through the centre of the spindle;

page_text: and Fig. 4 is a plan of the circular bed.
parts in all the Figures.
Similar letters refer to the same
The object of my improvement is to impart greater solidity to the revolving
plate upon which the work to be operated on is secured, and to so arrange the
machine as to make it complete in itself and not be dependent upon stone or
brick foundations for support to the spindle of the revolving plate, as hereto-
fore necessary in all large machines. To this end I make the bed piece A of
sufficient depth to give support to the uprights B, B, which carry the slide"
rest C, C, and tool slide D; said bed A is formed on its under side as a plate,
which rests on any suitable support for the machine, and the slide rest and
tool slide are of any desired character, and adapted to hold any tool suitable
for operating on the article placed on the bed.
In the centre of the machine and attached to the bottom plate E, I provide
a barrel F, which is supported laterally by the braces g, g, and having at its
lower end openings on opposite sides to receive the cross bar H, which is sup-
ported at its extremities by the set screws J, J, resting on the bottom plate E.
The set screws are of sufficient length to give a small vertical adjustment to
the cross bar H, which supports the step k.
The vertical adjustment to the step k may be obtained by the use of one set
screw beneath it, or by the use of a wedge in place of the cross bar H, should
it be found more convenient to do so. The step k rests upon the cross bar H
in such a manner as to prevent it turning, and the place of support is rounded,
so that should one of the set screws be raised more than the other, it may not
prevent the upper surface from fitting accurately to the bottom of the spindle
L, which is attached to the under surface of the face plate M. The step k
and spindle L are accurately fitted in the barrel F, which serves as a short
bearing for the spindle and a lateral support for the step. Motion is com-
municated from the driving pulley N to the face plate M by means of the
bevel pinion O and wheel P, or other suitable device.
On the under side of the face plate M, I provide an annular rib of metal Q,
of such form as may best sustain the revolving plate in every direction; I prefer
the V form usually adopted on planing machines, as I can thereby retain the
oil in contact with the revolving plate. This annular rib Qrests in a corre-
sponding and reversed piece R formed on or attached to the bed piece A.
To put the machine in working order the bar H is adjusted vertically by
means of the set screws J, J, so that nearly all the weight of the face plate M
may rest upon step k, the remainder being supported in the annular groove R
on the bed piece A.
By this arrangement the vertical and horizontal strain upon the face plate

page_text: M, which is due to the cut of the tool, will be mainly taken upon the groove
R, and the greater the distance of the tool from the centre of the plate, the
more service will the outer support be to the operation of the machine. It is
evident the form of the groove may be very much varied, or one side be taken
away altogether, so that I do not restrict my Invention to any particular form
of support.
What I claim as my Invention, and desire to secure by Letters Patent is,
revolving the face plate of boring or turning mills on a support as near as
convenient to the periphrey thereof, substantially as described.
I also claim the adjustable step or centre bearing when this is combined
with an outer support, substantially as described.
In witness whereof, I, the said William Sellers, have hereunto set my
hand and seal, the Twenty-first day of January, in the year of our
Lord One thousand eight hundred and fifty-eight.
Witnesses,
COLEMAN SELLERS,
No. 728, N. 19th St., Philadelphia,
WS. LEVERING,
No. 1531, Filbert St., Philadelphia.
WM SELLERS. (L.S.)