Year: 1897

page_text: Date claimed for Patent under Sect. 103 of Act,
being date of first Foreign Application (in 12th Aug., 1896
United States of America),
Date of Application (in United Kingdom), 11th Mar., 1897
Complete Specification Left, 11th Mar., 1897-Accepted, 17th Apr., 1897
I, JOSHUA OLDHAM, Saw Manufacturer, of Brooklin, in the County of Kings,
and State of New York, United States of America, 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:
My invention relates to certain new and useful improvements in insertible teeth for
saws- -band, circular, gang, or crosscut-and it has for its object, among other things,
to dispense with the use of additional or separate means to secure or hold the teeth in
place in the blade, as, for instance, the primitive rivet, the curved separate shank, and
like means; also to economize space in the arrangement of the teeth in the blade;
also to increase the cutting capacity of the individual teeth, especially in crosscut-saws,
and to obviate the swaging or setting of the teeth.
To these ends this invention consists, primarily, in the lateral enlargement or
thickening of the shank of the tooth at the base and the enlargement of or forming
an aperture at the base or lower end of the tooth-receiving socket or slot in the
blade to provide for the reception and interlocking therewith of the metal of the
tooth as its enlargement is compressed, so as to project the base of the looth forward
and rearward within said enlargement or aperture of the blade flush with the sides
of the blade, and in certain details of construction in connection therewith, all
substantially as hereinafter more fully disclosed, and specifically pointed out in the
claims.
In the accompanying drawings,
Fig. 1 is a broken-away side view of a crossout-saw embodying my invention or
insertible tooth.
Figs. 2 and 3 are a side and an edge view of the tooth, respectively.
Fig. 4 is a broken side view of a saw with teeth having chisel-bit form of teeth
embracing my
invention.
Fig. 5 is side, edge, and plan views of one tooth detached.
Fig. 6 is similar views of another form of the tooth.
Fig. 7 is a broken side view of a band, circular, or gang saw, also showing the
application of my invention thereto.
Fig. 8 is edge views of the teeth, one plain-faced and the other bifurcated.
Fig. 9 is a detached perspective view of the middle tooth of Fig. 1.
In securing insertible saw-teeth as heretofore constructed in place in the slot or
socket of the blade it was necessary to use a separate fastening, as a rivet, a throat-
piece or separable elongated curved shank, or like means. This method of securing
[Price 8d.]

page_text: the teeth was also objectionable in taking up unnecessary amount of space for each
tooth. These disadvantages I have overcome by my invention.
In carrying out my invention I produce the blade A, otherwise of ordinary
construction, with a straight or radial socket or slot a, terminating at its inner end or
base in a circular or angular enlargement or aperture a', the outer end of said slot or
socket being shaped according to the contour the shank of the teeth is required to
take at that point.
B is the tooth of the insertible character, having the inner end or base of its shank
portion enlarged or thickened laterally, as at b, the purpose of which is to permit after
annealing and subjecting it to the action of a flat punch compression of the same, so
as to cause it to project forward and rearward within the aperture or enlargement a¹,
which receives said enlargement, as at a³, the forward and rearward projections a³ thus
produced being further compressed flush with the sides of the blade and substantially
merged therewith, thus securing the tooth firmly in place.
The tooth has its shank a* provided on the front or forward edge with a shoulder a³,
abutting the upper edge of the blade, to limit the extent of the insertion of the tooth.
It will thus be seen that the use of the primitive rivet, a throat-piece, or elongated
curved shank taking up unnecessary space, as previously employed, or other like
means is wholly dispensed with. This construction also provides for the employment
of a greater number of teeth in the same amount of space than can be provided for
in the ordinary insertible toothed saw, as is obvious. The tooth B is of course
channeled or grooved along its longitudinal edges, as at b, to receive and interlock
with a corresponding rib along the side edges of the slots or sockets a of the blado A,
as heretofore, to hold the teeth against lateral displacement.
The tooth B proper is flared or broadened outward laterally, also forwardly and
rearwardly, from the blade A to its extreme outer edge, broadening the same thereat,
as at b, to obviate the necessity of swaging the tooth, as heretofore, to give it the
required "set," and this broadened-out portion is bifurcated, providing the tooth with
four or a plurality of cutting edges b³, two upon each face thus increasing or doubling
the cutting capacity of the tooth over the ordinary tooth.
In Figs. 7 and 8 is shown the principle of my invention as applied to a band,
circular, or gang saw with or without the bifurcated feature thereof, as at dd,
respectively.
In Figs. 4, 5 and 6 is disclosed the tooth of a band, circular, or gang saw with the
sides of its chisel bit or point either parallel throughout, as at c, or tapered, as at c',
rearward to the same width of the blade, also embracing the principle of my
invention.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. In a saw, the insertible tooth chisel bit or point having its base or inner end
provided with a lateral enlargement or thickened, in combination with the blade having
the tooth-receiving slot or socket provided at its base with an enlargement thereof, or
aperture receiving the enlargement at the base of said tooth, said tooth enlargement
adapted to be compressed or punched into a forward and a rearward projection,
substantially as set forth.
2. In a saw, the insertible tooth having its base laterally enlarged or widened out
and flared toward its upper cutting end in combination with the blade having its
tooth-receiving slot or socket provided with an enlargement or aperture at its inner
end or base receiving said enlargement of the tooth, said enlargement of the tooth
adapted to be compressed into a forward and rearward projection, substantially as
set forth.
3. In a saw, the insertible tooth having its upper end portion or point flared
toward its extreme outer edge and also toward its forward and rear edges and
bifurcated in its forward and rear faces, and having its base end laterally enlarged or
thickened, in combination with the blade having the tooth-receiving socket or slot
•

page_text: terminating in an enlargement or aperture at its inner end, said base-end enlargement
of the tooth adapted to be compressed into a forward and rearward projection,
substantially as set forth.
4. In a saw, the insertible tooth having a laterally enlarged or thickened inner
end or base and its longitudinal edges provided with grooves or channels, in
combination with the blade having the tooth-receiving slot or socket terminating at
its inner end or base in an enlargement or aperture receiving the enlargement at the
base end of said tooth, the longitudinal edges of said slot or socket having ribs engaging
the longitudinal grooves or channels of said tooth, said enlargement at the base end
of said tooth being compressed into forward and rearward projections, substantially as
set forth.
5. In a saw, the insertible tooth having its outer end or point enlarged laterally
and tapered rearwardly to the width of the blade and its baso laterally enlarged or
thickened, in combination with the blade having the tooth-receiving slot or socket
provided at its lower or inner end with an enlargement or aperture receiving the
enlargement at the base end of said tooth, said enlargement of the tooth adapted
to be compressed into a forward and a rearward projection, substantially as sot
forth.
Dated this 07th dow of Wabe 1907
WHEATLEY & MACKENZIE,
40 Chancery Lane, London, W.C., Agents.