Im- PROVEMENTS IN SECURING TEETH IN SAWS
Year: 1866

page_text: LETTERS PATENT to William Clark, of 53, Chancery Lane, in the County
of Middlesex, Engineer and Patent Agent, for the Invention of "Im-
PROVEMENTS IN SECURING TEETH IN SAWS."-A communication from abroad
by The American Saw Company, of New York City, United States of
America.
Sealed the 22nd February 1867, and dated the 21st September 1866.
PROVISIONAL SPECIFICATION left by the said William Clark at the
Office of the Commissioners of Patents, with his Petition, on the
21st September 1866.
I, WILLIAM CLARK, of 53, Chancery Lane, in the County of Middlesex,
Engineer and Patent Agent, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN SECURING TEETH IN SAWS," to be as follows:-
This Invention relates to a new and improved mode of securing teeth in
saws, and is more especially designed for securing teeth in circular saws. And
the Invention has for its object the securing of the teeth in the saw plate in such
a manner that they cannot possibly become loose and detached when the saw
is at work, nor the saw plate subjected to any undue strain, and the teeth at
the same time rendered capable of being readily fitted to and detached from
the saw plate.

page_text: Figure 1 is a side view of a portion of a circular saw having teeth fitted or
secured in it according to this Invention; Figure 2, a section of the same
taken in the line a, a, Figure 1; Figure 3, a section of the same taken in the
line
y, y, Figure 1; Figure 4, a side view of a portion of a circular saw,
showing a modification of the plan exhibited in Figures 1, 2, and 3; Figure 5
is a modification of Figure 4; Figure 6, a section of Figure 4 taken in the
line, Figure 7, a section of Figure 4 taken in the line ¹, z¹; Figure 8
is also a modification of the plan shown in Figure 1; Figure 9, a section of
Figure 8 taken in the line a¹, x¹.
A, Figure 1, represents a portion of a circular saw, and B one tooth thereof,
the teeth are of curved form, the outer or tooth portion a being taper and
having a proper raking position and connected to the inner part b, which is
straight, by a semicircular bend c as shown clearly in Figure 1. The saw A
is hollowed out or has recesses made in it at suitable or equal distances apart
b
to receive the teeth B, the semicircular part c and the shank or inner part
being in the saw and the outer tooth part a projecting out from the saw in a
as well as
raking position. The outer edge of the bend c and shank portion
the end of the latter, has a V-shaped groove d made in them to receive a
corresponding shaped edge made in the recesses of the saw and the teeth, and
saw have holes e drilled in them, one half of the holes being in the teeth a
and the other half in the saw, these holes receive pins f which secure the teeth
in the saw.
From the above description it will be seen that when the saw is at work
the resistance offered by the wood to the saw teeth will have a tendency
to secure the latter more firmly in the saw, the direction of the pressure being
indicated by the arrows, the teeth therefore cannot casually work loose as is
the case with other saws provided with detachable teeth.
Another advantage attending this Invention is that the teeth do not require
to be driven violently into the saw so as to expand the same, and cause it
to buckle as is the case where the teeth are provided with shanks fitted
in radial slots in the saw, the teeth thus fitted or driven in the saw are
difficult to remove and the saw is frequently checked or cracked thereby.
In Figure 8 the teeth are substantially of the same form as shown in
Figure 1, but instead of having the groove d to extend around the bend c
and shank portion b it extends around the bend c only, and the outer edge s
of the shank portion 6 is slightly bevilled or inclined in its transverse
section as well as the end of the said shank portion. The recess in the
saw has at its bend or semicircular part a V-shaped edge to fit into the
groove d, and the other part of the said recess is bevilled or inclined to

page_text: correspond to the adjoining surface of the shank portion 6 of the tooth, as
shown at a in Figure 9. This modification admits of the teeth being
adjusted laterally in the saw plate. The rivet f is inserted between the end
of the shank portion 6 and the end of the recess in the saw plate, as shown
clearly in Figure 8.
In the modification shown in Figures 4, 6, and 7, an incision is made in
each tooth A', a corresponding projection a on the plate B fitting into the
incision in the tooth as shown in Figure 4. A rivet 6 is then driven through
half of it, passing through the projection a, and the other half through the tooth
A', as shown in Figures 4 and 5, that side of the projection a which is opposite
to the one through which the rivet 6 passes has a V-shaped edge (Figures 6
b
and 7) fitting into a corresponding groove in the tooth. The tooth is attached
by placing the grooved edge of the tooth on the V-shaped edge of the
projection, driving the end which has half the rivet hole in it into the saw
plate from the side, which can very easily be done by a slight blow or
pressure. The rivet is then put in and headed to fill up the countersink, as
shown in Figure 7, and the ends of the rivet filed off smooth with the saw plate..
Figure 5 is a slight modification of Figure 4, in this instance a recess is
cut in the saw plate, into which recess a plate C is firmly secured, the end of
the said plate projecting from the saw plate like the projection a in Figure 4.
The outer end of the plate C fits into the tooth A¹, and is attached thereto in
the same manner as the projection a.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Clark in the Great Seal Patent Office on the
20th March 1867.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
CLARK, of 53, Chancery Lane, in the County of Middlesex, Engineer and
Patent Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-first day of September, in the year of our
Lord One thousand eight hundred and sixty-six, in the thirtieth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said William Clark, Her special licence that I, the said William Clark,
my executors, administrators, and assigns, or such others as I, the said
William Clark, my executors, administrators, and assigns, should at any time
agree with, and no others, from time to time and at all times thereafter.

page_text: 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
SECURING TEETH IN SAWS," a communication to me from abroad by The
American Saw Company, of New York City, United States of America, upon
the condition (amongst others) that I, the said William 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 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 William Clark, 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 Sheet of Drawings hereunto annexed;
and to the letters and figures marked thereon (that is to say) :-
This Invention relates to a new and improved mode of securing teeth in
saws, and is more especially designed for securing teeth in circular saws, and
the Invention has for its object the securing of the teeth in the saw plate in
such a manner that they cannot possibly become loose and detached when the
saw is at work, nor the saw plate subjected to any undue strain, and the teeth
at the same time rendered capable of being readily fitted to and detached from
the saw plate.
Figure 1 is a side view of a portion of a circular saw having teeth fitted or
secured in it according to this Invention; Figure 2, a section of the same
taken in the line x, x, Figure 1; Figure 3, a section of the same taken in the
line y, y, Figure 1; Figure 4, a side view of a portion of a circular saw
showing a modification of the plan exhibited in Figures 1, 2, and 3;
Figure 5 is a modification of Figure 4; Figure 6, a section of Figure 4
taken in the line, z; Figure 7, a section of Figure 4 taken in the line z¹, z¹;
Figure 8 is also a modification of the plan shown in Figure 1; Figure 9, a
section of Figure 8 taken in the line ¹, x¹.
.
A, Figure 1, represents a portion of a circular saw, and B, B, two teeth
thereof;
these teeth are of curved form, the outer or tooth portion a being
taper and having a proper raking position and connected to the inner part b
which is straight by a semicircular bend c, as shown clearly in Figure 1. The
saw A is hollowed out or has recesses made in it at suitable or equal distances
apart to receive the teeth B, the semicircular part c and the shank or inner

page_text: b
part 6 being in the saw, and the outer tooth part a projecting out from the
saw in a raking position. The outer edge of the bend c, and shank portion bi
as well as the end of the latter has a V-shaped groove d made in them to
receive a corresponding shaped edge made in the recesses of the saw, and the
teeth and saw have holes e drilled in them, one half of the holes being in the
teeth and other half in the saw; these holes receive pins f. which secure the
teeth in the saw.
...
From the above description it will be seen that when the saw is ȧt work
the resistance offered by the wood to the saw teeth will have a tendency to
secure the latter more firmly in the saw, the direction of the pressure being
indicated by the arrows. The teeth therefore cannot casually work loose as is
the case with other saws provided with detachable teeth.
3
Another advantage attending this Invention is that the teeth do not require
to be driven violently into the saw so as to expand. the same and cause it, to
buckle, as is the case where the teeth are provided with shanks fitted in
radial slots in the saw; the teeth thus fitted or driven in the saw are difficult
to remove and the saw is frequently checked or cracked thereby. In
Figure 8 the teeth are substantially of the same form as. 'shown in Figure 1,
but instead of having the groove d extend around the bend c and shank
portion 6 it extends, around the bend c only, and the outer edge of the
shank portion 6 is slightly bevilled or inclined in its transverse section as
well as the end of said shank portion. The recess in the saw has at its bend
semicircular part a V-shaped edge to fit into the groove d, and the other
part of said recess is bevilled or inclined to correspond to the adjoining
surface of the shank portion 6 of the tooth, as shown at a* in Figure 9. This
modification admits of the teeth being adjusted laterally in the saw plate.
The rivet is inserted between the end of the shank portion b and the end
of the recess in the saw plate, as shown clearly in Figure 8.
or
In the modification shown in Figures 4, 6, and 7. an incision is made in
each tooth A', a corresponding projection a on the plate B fitting into the
incision in the tooth, as shown in Figure 4. A rivet 6 is then driven through
half of it, passing through the projection a, and the other half through the
tooth A, as shown in Figures 4 and 5; that side of the projection a which
is opposite to the one through which the rivet b passes has a V-shaped edge
(Figures 6 and 7) fitting into a corresponding groove in the tooth. The tooth is
attached by placing the grooved edge of the tooth on the V-shaped edge of the
projection driving the end, which has half the rivet hole in it into the saw
plate from the side, which can very easily be done by a slight blow or
pressure; the rivet is then put in and headed to fill up the countersink, as

page_text: shown in Figure 7, and the ends of the rivet filed off smooth with the saw
plate.
Figure 5 is a slight modification of Figure 4; in this instance a recess is
cut in the saw plate, into which recess or plate C is firmly secured the end
of said plate projecting from the saw plate like the projection a in Figure 4.
The outer end of the plate C fits into the tooth A, and is attached thereto in
the same manner as the projection a.
. Having described the nature of this Invention and the manner of per-
forming the same, I declare that what I claim as the Invention to be
protected by the herein-before in part recited Letters Patent is,-
First, the removable or detachable teeth A curved or formed and fitted in
the saw plate in the manner substantially as shown, so that the resistance
which the wood offers to the teeth during the working of the saw will have
a tendency to bind or set the teeth more securely in the saw instead of loosening
them.
Secondly, constructing the teeth A¹ of a saw with recesses in such a manner
that they may be attached to projections from the saw plate, substantially as
shown and described.
In witness whereof, I, the said William Clark, have hereunto set my
hand and seal, this Twentieth day of Marcb, in the year of our Lord
One thousand eight hundred and sixty-seven.
Witness,
JAMES DAISH,
53, Chancery Lane,
London.
W. CLARK. (L.S.)