IMPROVEMENTS IN SAWS
Year: 1872

page_text: LETTERS PATENT to Alexander Melville Clark, of 53, Chancery Lane,
in the County of Middlesex, Patent Agent, for the Invention of
"IMPROVEMENTS IN SAWS."-A communication from abroad by Eben
Moody Boynton, of Grand Rapids, State of Michigan, United
States of America.
I, ALEXANDER MELVILLE CLARK, of 53, Chancery Lane, in the
County of Middlesex, Patent Agent, do hereby declare the nature of
the said Invention for "IMPROVEMENTS IN SAWS," to be as follows:-
The saw is provided with teeth having two cutting points and with a
cutting edge on each face, their outer cutting edges being inclined

page_text: The two points of the saw teeth are dressed to cut on one side of the
kerf, while the next succeeding cutting tooth has its two points dressed
to cut on the other side of the kerf. Alternately with these cutting
teeth are disposed clearing teeth, which remove the wood from the kerf.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Alexander Melville Clark in the Great Seal Patent
Office on the 17th August 1872.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ALEXANDER
MELVILLE CLARK, of 53, Chancery Lane, in the County of Middlesex,
Patent Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by. Her
Letters Patent, bearing date the Twenty-ninth day of February, in the
year of our Lord One thousand eight hundred and seventy-two, in the
thirty-fifth year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said Alexander Melville Clark,
Her special licence that I, the said Alexander Melville Clark, my
executors, administrators, and assigns, or such others as I, the said
Alexander Melville Clark, 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 SAWS," a communication
to me from abroad by Eben Moody Boynton, of Grand Rapids, State
of Michigan, United States of America, upon the condition (amongst
others) that I, the said Alexander Melville Clark, my executors or
administrators, by an instrument in writing under my, or their, or
one of their hands and seals, should particularly describe and ascer-
tain 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 Alexander Melville Clark, do
hereby declare the nature of the said Invention, and in what manner

page_text: the same is to be performed, to be particularly described and ascertained
in and by the following statement, reference being had to the accom-
panying Drawing, and to the letters marked thereon (that is to say) :-
This Invention relates to saw teeth, and consists in the peculiar shape
of the cutting and clearing teeth and their arrangement, as herein-after
more fully described.
It has heretofore been usual to construct the teeth of saws of this
class of shape, in which case cutting is performed by drawing the
inclined edge of the tooth across the fibre, and applying more or less
pressure to the saw.
According to this Invention the tooth is so constructed as to perform
the operation of cutting by direct action as a plane bit, the edge of the
tooth being projected to cut the fibre at an angle opposite to the old
V tooth by direct action. I construct these improved teeth in the form
of an inverted M, or nearly so, as represented in the accompanying
Drawing, there being two cutting points a, a, on each tooth, with a
cutting edge 6 and 6' on each side of said points a, a, the outer cutting
edges 6¹ being inclined inward slightly from the points a towards the
body of the saw. Two consecutive cutting points in one base or tooth A.
are dressed to cut on one side, the next succeeding tooth A¹ being
reversed to cut on the other side of the kerf as often as cutting teeth
are employed. The teeth thus formed constitute the principal cutting
teeth of the saw, and being presented to the fibre at an acute angle tend
to raise the cut portion up from the solid or uncut portion, and will cut
it with greater facility and ease. B are clearer teeth, which are made
straight along their horizontal face as represented at e, with a small
tooth or point a¹ formed at each extremity.
These points a project slightly beyond the face e, and are filed,
beveling each way from the centre on their under face. Their object or
duty is to clear away the sawdust formed by the cut of the teeth A, A',
directly in advance of the points a, removing the particles of sawdust
until it is carried out of the timber.
It will thus be seen that the dust cut by the preceding teeth A or A¹
is cleared away by the following clearer tooth B, thus leaving a clear
path for the cut of the succeeding cutting teeth. By the construction
of the teeth A, A', each set cuts at both the forward and the backward

page_text: motion of the saw, and one set cuts on one and the next succeeding
set on the other side of the kerf at the same time in both motions of
the saws, as their cutting faces are on opposite sides of the cut.
In each forward or backward motion of the saw the cutting faces b, b,
and b', b', respectively operate while the clearing teeth B remove the 5
sawdust formed by the teeth A, A³.
Having described. the nature of the Invention, and in what manner
the same is to be performed, declare that what I claim as the Inven-
tion to be protected by the herein-before in part recited Letters Patent
is,—
1st. A saw provided with teeth A, A¹, having two cutting points a, a,
as shown with cutting edge on each face b, b', and their outer cutting
faces inclined inward from the point, substantially as shown and
described.
1
2ndly. The tooth A with its two points dressed to cut on one side of 1
the kerf, and the next succeeding cutting tooth A' with its two points
dressed to cut on the other side of the kerf, as set forth.
3rdly. The clearing tooth B, constructed substantially as shown and
described.
In witness whereof, I, the
hereunto set my hand and
said Alexander Melville Clark, have 2
seal, this Sixteenth day of August, in
the year of our Lord One thousand eight hundred and seventy-
Witness,
JAS. O. DEWEY,
53, Chancery Lane,
London.
A. M. CLARK. (L.S.)