Improvements in Saw Sets.
Year: 1897

page_text: Date of Application, 18th Feb., 1897-Accepted, 17th Apr., 1897
Improvements in Saw Sets.
I, ROBERT DILLON, of Mill Street, in the Town of Oshawa, in the County of
Ontario, in the Province of Ontario, Canada, Manufacturer, 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 improvements in saw sets and the object of the invention.
is to design a form of saw set in which the force of the blow on the shank of the.
set inay be exerted practically directly above the tooth and in what also the set.
may be held close to the blade and the point of the tooth held clear of contact, so
as not to injuriously affect it during the operation and it consists essentially of
forming in conjunction with the body and detachable block and V-shaped notch in
the block an inwardly inclined recess in the body within the V-shaped notch in the-
block and extending upwardly above such recess, the block being designed to come.
below the bottom edge of the inclined recess and further in providing a set screw at.
the bottom end of the shank to vary the degree of set as hereinafter more.
particularly explained.
Fig. 1, is a cross section of my saw set and saw blade showing the manner of
applying the set.
Fig. 2, is a detail of the body.
Fig. 3, is a detail of the block.
In the drawings like letters of reference indicate corresponding parts in each
figure.
A is the main body of the saw set. The upper portion of the body A. is tapered
from about the centre upwardly to the upper end. At about the centre are formed
shoulders a. The block is here reduced in diameter, and has a continuous taper
downwardly on two opposite sides only, the other sides being parallel to each other.
The lower tapered portion designate A'. The upper tapered portion, which
I shall designate A is formed with the corners rounded off for convenience in
handling. The section of the lower portion A' however is rectangular in cross
section although tapered.
al is an annular recess formed in one of the inclined sides of the tapered lower
portion A', the long face of the recess being preferably formed from the bottom
edge upwardly.
B is a block, which is made to fit the tapered lower portion A' and provided
with an inclined V-shaped notch 6 at its lower inner edge but on the same side as
the recess a¹. The lower end of the block B extends below the lower edge of the
recess a¹ as will be seen on reference to Fig. 1, full lines, and dotted lines in Fig. 2.
C is a set screw, which extends through the lower end of the portion A and
which is provided with a lock uut c. D is the saw blade and d a tooth. By means
of the set screw C, the end of which necessarily abuts against the blade D when
the set is placed in position, the amount of set required may be given to the upper
end or point of the tooth d, the straight face of which is held against the upwardly
inclined face of the recess a'. By moving the set screw, so as to extend farther
through the portion A' towards the blade the amount of set is of course decreased
and by moving the set screw in the opposite direction so that the end of the set
screw next the plate comes closer to the portion A', the amount of set of the point
of the tooth is correspondingly increased when the blow is given on the top of

page_text: In giving such blow it will of course.be understood that as the point of the tooth
does not abut against any metal but is left free in the recess a¹, such point will not
be blunted or otherwise injuriously affected but will receive a perfect set when the
blow is given.
It will be noticed as hereinbefore described that the lower edge of the block B
-extends below the lower edge of the recess a¹ and consequently when the set is
placed in position the tendency of such-set when the blow is given on account of
the bending tendency given by having the lower edge of the block below the edge
of the recess a¹ is to make the lower end of the saw set and blade approach each
other.
In ordinary saw sets now commonly in use. the tendency is the reverse that is to
say the lower portion of the set is liable to spring. away from the blade when the..
blow is given and thereby serve to destroy the efficiency of the set.
In my
invention, however, the set will be caused to remain close to the blade and. the
efficiency of the set is consequently not affected at all, so that when the tooth is
withdrawn the set, will be perfect.
It will be seen from this description that I am enabled, by simply using one side
of the tapered lower portion and one recess in the block to give any degree of set
required and this, too, on any sized tooth, as the V-shaped notch in the block is
made broad enough to take the largest size tooth, and the apex or back of the
tooth fits the apex of the recess.
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. A saw set comprising the body having an annular shoulder and an inclined.
side below said shoulder, said side having a recess therein the bottom wall of which
extends at an obtuse angle thereto, and a hollow block having an inclined inner
wall fitted to said inclined side, the upper edge of said block being adapted to abut
against said shoulder, said block having a notch in the inclined wall thereof the edge of
which projects into the recess in said side whereby the side of the saw set tooth
will rest in said notch and the point thereof will project beyond said notch into the,
recess, substantially as described.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant..