AN IM- PROVED ARRANGEMENT OF SAWING MACHINERY
Year: 1852

page_text: LETTERS PATENT to James Yule, of St. Luke's Terrace, in the
City of Gloucester, Mechanician, for the Invention of "AN IM-
PROVED ARRANGEMENT OF SAWING MACHINERY."
Sealed the 22nd December 1852, and dated the 8th October 1852
PROVISIONAL SPECIFICATION left by the said James Yule at
the Office of the Commissioners of Patents, with his Petition. on
the 8th October 1852.
I, JAMES YULE, do hereby declare the nature of the said Invention
for "AN IMPROVED ARRANGEMENT OF SAWING MACHINERY" to be as
follows:-
My Invention consists in a novel construction and arrangement of
machinery intended to be employed chiefly for sawing wood. On a
horizontal fulcrum, pin, or axle (set in suitable bearings) a segment
frame is mounted. This fiame is furnished at its segmental edge with
a saw blade or blades having the same segmental form, and intended,
by being worked up and down in a vertical plane, to sever the blocks of
timber that are brought into contact therewith into planks or other
required pieces.
The saw frame is actuated by a steam engine or other suitable
driving power, through the agency of a pair of arms on a stationary

page_text: rocking shaft, which arins form as it were a bell crank lever, one
limb of the lever being connected to the extremity of the segment
frame by means of a connecting 10d, and the other arm to the
parallel motion of the engine by a similar rod. This arrangement
will allow of a rapid reciprocating motion being communicated to the
saw blade, and that with the expenditure of very little motive power, a
large portion of the weight of the saw frame being carried by the axle
on which it rocks. If preferred, this arrangement may be mounted so
as to make a horizontal instead of a vertical cut.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said James Yule in the Great Seal Patent Office,
on the 8th April 1858.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I,
JAMES YULE. of Saint Luke's Terrace. in the City of Gloucester,
Mechanician, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Eighth day of October, in the year
of our Lord One thousand eight hundred and fifty-two, in the
sixteenth year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said James Yule, Her special
licence that I, the said James Yule, my executors. administrators,
and assigns, or such others as I, the said James Yule, 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 IMPROVED
ARRANGEMENT OF SAWING MACHINERY," upon the condition (amongst
others) that I, the said James Yule, by an instrument in writing under
my hand and seal, 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:

page_text: NOW KNOW YE, that I, the said James Yule, do hereby declare
the nature of my 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):
This Invention relates to a novel inode of mounting the saw blades
or cutting tools used for sawing or severing wood, stone, slate, &c., the
object being, first, to simplify the construction of the machinery en-
ployed; and, secondly, to economize the motive power expended in
performing the cutting operation. To this end 1 mount the cutting
tools at one extremity of a frame, which vibrates or rocks on a dead
centre, and I communicate a reciprocating motion to the frame by
means of a pair of links jointed to a pair of levers keyed to a shaft,
which receives a rocking motion from the crank shaft of a steam or
other motive power engine.
In the accompanying Drawing, Fig. 1, shews in side elevation
an arrangement of machinery for sawing wood, constructed accord-
ing to my Invention; Fig. 2, is an end elevation of the same:
and Fig. 3, a plan view of the frame with the cutting tools attached.
In these Figures a, a, is a dead shaft carried by suitable supports,
and upon it a vibrating frame b, is loosely nounted. This frame
is constructed, by preference, of cast and wrought iron, the two
extremities being cast iron and the intermediate parts or bracings of
wrought iron, but if it is required the whole may be made of cast
iron Between the side pieces of this frame two cross bars b+, 6*, are
secured by bolts and nuts, and in these bars straight slots are made,
extending nearly from end to end thereof, to receive the tangs of the
saw blades c, c, c, the cutting edges of which blades are formed to cor-
respond to the are described by the vibrating frame during its vertical
movements. These blades c, c, c, are capable of being set at any dis-
tance apart to suit the work in hand. in the same manner as the blades
of the ordinary self-acting sawing machinery. To the lower end of the
fore part of the frame b, links d, d, are jointed, for the purpose of con-
necting the frame with a pair of levers e, e, to which they are attached.
These levers are keyed to a shaft f, which is mounted in suitable

page_text: bearings, and is capable of rocking therein a lever y, connected by a
rod h, to the crank shaft of the motive power engine, being keyed to
the shaft f, for that purpose.
It will now be understood that if a baulk of timber be fed up to the
saw blades, and kept in contact therewith by any convenient means, the
reciprocating motion of the frame obtained by the throw of the crank of
the motive power engine will cause the saws to enter the baulk of timber,
and cut it lengthwise into pieces of any desired thickness, according to
the distance at which the saw blades were set apart before starting the
machinery.
When I apply my Invention to the cutting of stone or other like
granular substance I mount the frame so that it shall move in a hori-
zontal instead of a vertical plane, and in place of serrated blades I use
bladles with a smooth edge, employing, as is connnon in such cases, sand
and water to facilitate the cutting operation; or, in place of these smooth
edged blades, I affix to the cross bars of the frame lines of chisels, which
will chip off instead of grinding away the stone which lies in a line with
the progress of these cutting tools.
Having now set forth the nature of my Invention of an improved
arrangement of sawing machinery, and explained the manner of carry-
ing the same into effect. I wish it to he understood that under the
above in part recited Letters Patent I claim the mounting of saw blades
or cutting tools on a vibrating or rocking frame for the purpose of
sawing or severing wood, stone, and other materials requiring such
treatment.
In witness whereof, I, the said James Yule, have hereunto set my
hand and seal, this Eighth day of April, One thousand eight
hundred and fifty-three.
Witness,
J. W. MOFFATT,
66, Chancery Lane.
JAMES YULE. (L.S.)