Year: 1886

page_text: I, JAMES PECKOVER, of 158, North Twenty Second Street, in the City of
Philadelphia, State of Pennsylvania, United States of America, Stone Cutter, 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 :-
The object of this Invention is to construct a stone saw which will be more
efficient in its action than saws of the ordinary construction, and this object
I attain as and by the improved means hereinafter fully described.
On the accompanying drawings:-
Fig. 1, represents a side view of a portion of my improved saw.
Fig. 2, is a side view of one of the teeth, drawn to a larger scale.
Fig. 3, is a plan view of the tooth, drawn to a still larger scale.
Fig. 4, is a perspective view of a portion of the saw provided with one of the
teeth; and
Fig. 5, is a perspective view of the several parts detached.
1
In the sawing of stone, the cutting action is produced almost entirely by the sand
or other granular substance, which is fed into the saw kerf with the aid of water,
and which is intended to find its way under the edge of the saw blade to cut the
stone.
With the ordinary construction of plain saw blade, it is very difficult to get the
sand or other grains beneath the edge of the blade, and in order to overcome this
difficulty, I provide the saw blade, A, (which I prefer to make thinner than usual),
with side plates, B, at suitable intervals apart, these side plates being provided with
inclined upper edges, and being rivetted to the blade on one or both sides, preferably
both.
.
There are thus formed on the face of the saw blade inclined shoulders, b, to
facilitate the passage of the sand or other granular material into the kerf below
the saw blade.
Below the side plates, B, the blade, A, is recessed at, a, for the reception of
separate teeth, D, of the following peculiar construction. These teeth are as thick
as the combined thicknesses of the corresponding plates, B, and blade, A, and they
have at their upper parts, projections, d, to fit in the recesses, a, in the blade. These
recesses, a, have at their opposite corners notches, a³, for the reception of lugs, d',
on the projections. d.

page_text: In fitting a tooth to its place, these lugs, d, are bent back as illustrated in
Figs. 2, 3, and, 5, to permit the tooth, D, to be pushed up into the recess, a, and
then the lugs are straightened by hammering or otherwise, as illustrated in Fig. 4,
to retain the teeth in the blade.
The under edge of each of these teeth is curved or bevilled near its opposite ends
at, f, so that as the saw is reciprocated, the sand or other granular substance will
more readily get under the edge of the teeth. To further assist in getting the sand
or equivalent down in the saw kerf underneath the teeth of the saw, I cut inclined
grooves, e, in one or both faces of the teeth, as illustrated more clearly in Figs. 4,
and 5.
I prefer to cut in the projections, d, of each tooth, a vertical notch, m, extending
into the body of the tooth, so that when the tooth is about worn out, it will be
worn through to the bottom of the notch, and the two portions of the tooth thus
left can be more readily withdrawn from the blade.
In cutting stone with my improved saw, the sand or equivalent which is fed
down into the kerf quickly slides down over the inclined shoulders, b, on the side
of the saw blade, and finds its way down under the lower surface of the teeth of
the saw, so that an effective cutting action of the stone is insured at all times.
•
Having now particularly described and ascertained the nature of my, said
Invention, and in what manner the same is to be performed, I declare that what
I claim, is
1.. A stone saw blade provided with projecting thickened teeth, and having on
its sides immediately over the teeth, inclined shoulders, b, substantially as and for
the purpose hereinbefore set forth.
2. The combination of the saw blade and thickened teeth, with side plates having
inclined upper edges secured to the blade of the saw above the teeth, substantially
as herein before specified.
3. A stone saw blade provided with teeth having on their sides inclined grooves, e,
substantially as and for the purpose hereinbefore described.
4. The combination of the saw blade having inclined shoulders, b, on its side,
with teeth having inclined or bevilled under surfaces, substantially as hereinbeföre
set forth.
5. The saw blade, having recesses with notches at the corners thereof, in com-
bination with teeth having notches, m, extending into their bodies, and having
projections adapted to the recesses and notches in the blade, all substantially as and
for the purpose hereinbefore set forth.
Dated thio 05th dox of Tonum 1886