IMPROVEMENTS OF SAW SHARPENING APPARATUS
Year: 1886

page_text: Date of Application, 15th June, 1886.
Complete Left, 15th Mar., 1887.
Complete Accepted, 10th May, 1887.
ISAAC HILL of George Street Derby, in the County of Derbyshire, Engineer do
hereby declare the nature of my invention for IMPROVEMENTS OF SAW SHARPENING
APPARATUS, to be as follows :-
The object of my said invention, is to produce a much more simple, reliable, and
easier method of sharpening saws automatically; but especially designed for circular
saws.
My present existing apparatus to which I intend to attach these improvements, is
composed of a sleeve bearing or carriage, with a projecting boss on one side, formed
in one with the sleeve bearing or carriage, on this bearing I accuratly fit a spindle or
axle, but fitted so that it will revolve, and to this said spindle or axle, I form at right
angles a spindle bearing or carriage in one with the part that passes through, and is
fitted in the sleeve bearing or carriage: this part that passes into the said sleeve
bearing or carriage, is formed near to one end of the part that serves as a spindle
bearing or carriage, so that a balance weight is required to give an equlibrium. [
attach my balance weight to a lever, and arrange it so that it is movable, and set to
the place or position required. I fix my lever to the end of spindle or axle, that
protrudes thro the said sleeve bearing or carriage, thro this spindle bearing I pass a
spindle, which is fitted with two washers, and screw & nut, so as to carry an Emery
wheel of any diameter or formn, on the other end of this Emery wheel spindle is a
pulley, for the purpose of running a belt, or band, for revolving the Emery wheel. I
also fix a handle, & guard to the end of the spindle bearing or carriage, which passes
from side to side, surrounding the Emery wheel: on the under side of the projecting
side boss of the sleeve bearing or carriage, I form a plate with boss, and fitted with an
adjusting screw; a lesser or greater cut may be given in sharpening the saw, so that
by bringing the spindle carriage or bearing down to the said screw in sharpening
every tooth the saw is kept round.
By this apparatus we give two separate motions, first a spindle revolving, and
second a motion given whereby we may raise the Emery wheel from of its work.
My Improvement consists of forming on the underside of spindle bearing or
carriage, which carries the Emery wheel spindle, a projection or projections: these

page_text: projections are for keeping in proper line or position a slot plate, & at one end is
formed a female joint, this slot in the plate is fitted on to the projections on the
underside of the said spindle bearing, and is kept in its place by a set screw, after it
is properly adjusted, and set for work: in this female joint I place a male joint, fitted
with a centre pin for it to rotate upon; this said female joint is formed upon one end
of a light curved bar of desired length, and upon the other end of this said curved
bar, I form a hook catch provided with two lips or guards, so that it will keep on the
saw, this catch works on the teeth of the saw, the saw therefore acts as a catch wheel.
I also form, and place a plate with an adjusting set screw on the top of the side boss
or projection, (or a suitable place on my present sharpening apparatus,) and extending
so that the setscrew is directly over the spindle bearing or carriage; this setscrew is
for adjustment, so that the exact height or lift required to give the saw, a proper and
exact movement according to the pitch of the saw.
By raising the Emery wheel off the tooth of the saw, (as in any other sharpening
apparatus,) the required height or lift, that is till the top side of the spindle bearing
touches the adjusting scrow, or setscrew previously set; this upward motion also
gives a forward motion to the saw, by moving the apparatus downwards till the
underside of the spindle bearing, or carriage, touches or is prevented going lower by
the adjusting screw, which is in the plate on the underside of the projecting side boss,
on the sleeve bearing or carriage, then the forked catch is in its proper place or
position for pushing forward or revolving the saw; and this is done whilst the
upward motion of the apparatus is being given, and when raised till it touches the
top adjusting screw, as before, the apparatus is again brought down to the lower
screw and the same motion is again given for each tooth to be sharpened, of course
every time the apparatus is brought down the Emery wheel on spindle also touches
the saw that is to be sharpened.
I also make the apparatus entirely automatic, by driving by a belt from a pulley on
a counter shaft, (now on my machine) to a pulley giving proper speed, and supported
in a bearing, and fixed in proximaty to the sharpening apparatus, and having a disc,
and movable stud in a slot on one side of the pulley. I connect the sharpening
apparatus, and the adjustable stud by a connecting rod fitted with a flexible joint
attachment. I thus get this upward, and downward motion refered to before,
and required for moving the sharpening apparatus.
Dated this Twelfth day of June Eighteen hundred and Eighty six.

page_text: ISAAC HILL, George Street Works Derby, in the County of Derbyshire, Engineer
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 object of my said invention is to produce a much more simple, reliable, and
easier method of sharpening saws automatically, but especially designed for circular
saws.
My present existing apparatus, to which I intend to attach these improvements, is
composed of a sleeve bearing or carriage, A Fig. 1 & 2, with a projecting boss on
one side, formed in one with the sleeve bearing; in this bearing I accurately fit a
spindle, or axle, but fitted so that it will revolve, and to this said spindle, or axle, I
form at right angle a spindle bearing, or carriage, B Fig. 1 & 2, in one with the
part that passes thro, and is fitted in a sleeve bearing, or carriage, A Fig. 1 & 2;
this part that passes into the said sleeve bearing, or carriage, A Fig. 1 & 2, is formed
near to one end of the part that serves as a spindle bearing, or carriage, B. Fig. 1, & 2,
so that a balance weight C Fig. 1 & 2, is required to give an equilibrium. I attach
my balance weight C Fig. 1 & 2, to a lever D Fig. 2, & arrango it so that it is
moveable, and set to the place or position required. I fix my lever to the end of the
spindle, or axle, that protrudes through the said sleeve bearing, or carriage, A Fig. 1 & 2,
thro this spindle bearing B Fig. 1 & 2, I pass a spindle which is fitted with two
washer, e&e Fig. 1 & 2, and screwed with nut, so as to carry an Emery wheel of any
diameter or form; on the other end of this Emery wheel spindle is a pulley / Fig. 1 & 2,
for the purpose of running a belt, or band, for revolving the Emery wheel, I also fix a
handle, and guard g Fig. 1 & 2, to the end of the spindle bearing, or carriage A Fig. 1 & 2,
which passes from side to side, and surrounding the Emery wheel; on the undersidé
of the projecting side boss of the sleeve bearing, or carriage, A Fig. 1 & 2, I form a
plate g Fig. 1, with boss, and fitted with an adjusting screw Fig. 1, so that a lesser
or greater cut may be given in sharpening the saw; so that by bringing the spindle
carriage, or bearing, B. Fig. 1 & 2, down to the said screw h fig. 1 in sharpening
every tooth the saw is kept round.
By this apparatus we give two separate motions, first, a spindle revolving, and
secondly, a motion given whereby we may raise the emery wheel from off its work.
My Improvement consists of forming on the underside of the spindle bearing,
or carriage, 6 Fig. 1 & 2, which carrys the Emery wheel spindle, a projection or
projections, i Fig. 1, these projections are for keeping in proper line or position a
slot plate, k Fig. 1 & 2, and at one end is formed a female joint, m Fig. 1 & 2 this
slot in the plate is fitted onto the projections on the underside of the said spindle
bearing, B Fig. 1 & 2, and is kept in its place by a setscrew, after it is properly
adjusted, and set for work. In this female joint, m Fig. 1 & 2, I place a male joint
fitted with a centre pin, o Fig. 1 & 2 for it to rotate upon, this said male joint is

page_text: formed upon one end of a curved bar, p Fig. 1 & 2, of desired length, and upon the
other end of this curved bar I form a hooked catch p¹ Fig. 1, provided with two lips,
or guards, so that they will keep it on the saw, a Fig. 1, this catch working on the
teeth of the saw; the saw therefore acts as a catch wheel, I also form, and place a
plate g Fig. 1 & 2, with an adjusting setscrew ' Fig. 1 & 2, on the top of the side
boss, or projection, (or a suitable place on my present sharpening apparatus,) and
extending so that the setscrew / Fig. 1 & 2, is directly over the spindle bearing, or
carriage, B Fig. 1 & 2, this setscrew 7 Fig. 1 & 2, is for adjustment so that the exact
height, or lift, required to give the saw a proper, and exact movement, according to
the pitch of the saw; by raising the Emery wheel off the tooth of the saw (as on any
other sharpening apparatus) the required height, or lift that is, till the top side of the
spindle bearing, B Fig. 1 & 2, touches the adjusting screw or setscrew ¹ Fig. 1 & 2,
it being previously set this upward motion also gives a forward motion to the saw in
direction of the -
Fig. 1, by moving the apparatus downwards, till the under-
side of the spindle bearing, or carriage, B Fig. 1 & 2, touches, or is prevented going
lower by the adjusting screw Fig. 1, in the plate on the underside of the projecting
side boss, g Fig. 1 on the sleeve bearing, or carriage, a Fig. 1, then the forked
catch p Fig. 1 is in its proper position for pushing forward, or revolving the saw,
and this is done whilst the upward motion of the apparatus is being given; and when
raised till touching the top adjusting screw, h¹ Fig. 1 & 2, as before, the apparatus is-
again brought down to the lower screw h Fig. 1, and the same motion is again given
for each tooth to be sharpened, and every time the apparatus is brought down the
Emery wheel on spindle, also touches the saw that is to be sharpened.
Having now particularly described, and ascertained the nature of my said invention,
& in what manner the same is to be performed; but I wish it to be understood that İ
do not bind myself, to the exact details which are liable to slight alterations without
departing from the principle of my invention; I declare that what I claim is
The automatic movement, and revolving motion given to the saw, so that each tooth
is brought up automatically to be sharpened, as described by my specification and
drawings, also I claim the improvements as substantially set forth and illustrated.
Dated this Fourteenth day of March 1887.