Year: 1887

page_text: I, EBEN MOODY BOYNTON, of the Town of West Newbury, State of Massachusetts,
United States of America, Gentleman, do hereby declare the nature of this invention,
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
The use of saws has largely taken the place of axes, and any saving of time in
filing and sharpening the former, especially in the forest where it often has to be done
saves the time of men and teams.
The shaping of the saw teeth, especially the concaving of the same, if carefully used
will enable the sawyer to save time enough in using the first set of teeth to pay for
the entire cost of the saw.
The object of my invention is to secure greater speed and ease in sawing, and
especially cross-cutting wood and other fibre, by providing a saw blade with concaved
teeth of a peculiar character hereinafter described; and by the same means to save
time, files, and expense in repairing and sharpening the saw. In order to make my
invention more clearly understood I have shown in the accompanying drawing a
means for carrying it into effect. In said drawing:-
Figures 1, to 5, represent side views of various forms of saw teeth embodying my
invention.
Fig. 6, is an edge view of the form of tooth shown in figure 5.
A indicates the edges, 6 the sides, and D the end of the tooth, which is M shaped
in side elevation.
The end D is hollowed out as shown so as to leave two cutting points c.
The concaves herein before referred to are shown at a. They are formed in the
edges of the teeth so that the file in sharpening will touch only a comparatively small
surface near the points, and a great saving be effected in the time and cost of
sharpening and repairing.
The teeth also perform their work better in removing wood and in giving the dust
clearance. Bevels a' give the teeth acute points and side cutting edges near the
points.

page_text: The teeth may be slotted as shown at B, and especially in figure 3, by which ease
of clearance and sharpening is further increased.
The bottom of this slot is preferably curved to prevent fracture.
For small teeth, the shape shown at K, may be in some cases employed.
In figures 2, the shape of the point as shown at c, differs from that in Figure 1, only
in being turned outwards. This adapts it to hard wood.
In Figures 4, and 5, the concavity upon the ends D of the teeth, instead of being
rounding is formed by a re-entering angle F formed by two plane surfaces. This form
is better adapted for small teeth, and permits a flat file to be used in sharpening.
When the teeth are large this form may be slotted as shown at B in said figures.
In figure 5, I have shown below the concaves a, supplemental concaves J, which
may be produced in the saw-blade in the course of manufacture, and saves labor in
making repairs.
"
I am aware that the sides of saw teeth have been concaved to take the place of set,
and this is not claimed by me.
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
1st. A saw tooth, double pointed, having bevels a³, and having concaves a in
proximity to the points, substantially as set forth.
2nd. A saw tooth, double pointed, and having concaves a in its opposite edges
in proximity to the points and extending across the tooth from side to side, the edges of
the tooth below the concaves being inclined towards each other so that the tooth is
narrower near its point than at its base, substantially as set forth.
3rd. A saw tooth, double pointed, and having concaves a in its opposite edges in
proximity to the points and extending across the tooth from side to side, the tooth
being also concaved upon its outer end, substantially as set forth.
4th. A saw tooth, double pointed, and having concaves a in proximity to the points,
said teeth having additional concaves J below the concaves a, substantially as
described.
Dated this 22nd day of November 1887
HERBERT J. ALLISON,
Agent for the Applicant."