IMPROVEMENTS IN MACHINERY OR APPARATUS FOR PROVISIONAL SPECIFICATION FOR SHARPENING OR FILING THE TEETH OF SAWS
Year: 1881

page_text: LETTERS PATENT to Frederick Myers, of the City and State of New York;
United States of America, now of No. 8, Southampton Buildings, London,
for an Invention of "IMPROVEMENTS IN MACHINERY OR APPARATUS FOR
PROVISIONAL SPECIFICATION left by the said Frederick Myers at the Office
of the Commissioners of Patents on the 30th June 1881.
FREDERICK MYERS, of the City and State of New York, United States of
America, now of No. 8, Southampton Buildings, London. "IMPROVEMENTS
IN MACHINERY OR APPARATUS FOR SHARPENING OR FILING THE TEETH OF
SAWS."
My Invention relates to machinery or apparatus for sharpening or filing the
teeth of circular or other saws, and consists in various novel features in the
construction of the same as hereinafter described.
In carrying the said Invention into practice, I mount in suitable front and rear
bearings attached to an upright standard or support a longitudinally reciprocating
shaft, whose forward end is provided with a disc or plate to which a file carrier or
holder is secured. The front end of the said shaft which slides through the front
bearing is round, and the rear end of the said shaft is. square and slides through a
correspondingly shaped hole in the rear bearing, thereby preventing the rotation of
the said shaft upon its axis. To the rear end of the said shaft I attach one end of
a connecting rod, whose other end is fixed to a crank-arm upon a horizontal
driving shaft also supported in fixed bearings upon the standard of the apparatus,
and provided with a driving pulley which receives motion from any suitable source
of motive power.
This crank arm is provided with a slot to permit the front end
of the connecting rod to be moved nearer to or farther from the centre of the
driving shaft so as to decrease or increase the longitudinal throw of the aforesaid
reciprocating shaft and the file-carrier and file.
To permit the said file-carrier to be turned upon its axis to give to the file any
desired cant or incline laterally, I provide in a disc formed on the said carrier and
abutting against the disc on the longitudinally reciprocating shaft a semicircular
D

page_text: slot, through which a screw entering a tapped hole in the last mentioned dise
passes. By loosening this screw the file-carrier can be readily turned, the said file
and file carrier or holder being held in the desired position when the aforesaid
screw is again tightened.
To limit the extent of downward movement of the file towards the saw to be
filed or sharpened, and consequently ensure uniformity in the depth of the teeth
of the saw when sharpened, I pivot the jaws between which the said file is
clamped to lugs on the file carrier or holder disc, and pass through a forwardly
projecting piece on the said disc a set screw upon which the said jaws rest. By
the adjustment of this screw the extent to which the file can descend towards the
saw may be readily determined. The file is provided at its forward end with a
handle to permit it to be readily raised from or forced down upon the saw to be
sharpened or filed.
To support the saw to be sharpened in the proper position to be acted upon by
the file, I arrange upon the standard of the apparatus a bracket or support which
carries a face plate having a vertical slot therein. Through this slot passes the
shank of a piece upon which the saw is placed, the said piece being made conical,
so that saws having central openings of various diameters may be readily placed
thereon. Through this conical piece passes a screw which carries at its forward
end a clamp, adapted to press the saw firmly upon the said piece when suitable
nuts are screwed up in contact with the said clamp and against the rear surface of
the face-plate.
By adjusting the conical piece and the parts carried thereby up or down within
the aforesaid slot in the face-plate, saws of various diameters may be brought into
the proper position to be operated upon by the reciprocating file.
To prevent the buckling or twisting of the upper part of the saw when
submitted to the action of the file I arrange on the rear side of the said saw an
adjustable set-screw, which when the said saw is clamped in position to set up
against the said rear surface of the saw near its periphery.
To permit the saw to be adjusted laterally in a direction at right angles to the
vertical axis of the standard of the apparatus I pivot the aforesaid face-plate to
the bracket at its upper and lower extremities, so that by turning the said face-
plate upon its pivots the saw may be so adjusted in relation to the file that the
front or cutting surface of the teeth of the saw when sharpened will have any
desired angle. I also in some cases so arrange the aforesaid bracket or support
that it may be swung around the standard of the machine for this purpose.
When my machine is employed for sharpening saws which are not circular, the
devices for holding the saw will be somewhat modified, but as the necessary
modifications for this purpose will be obvious they need not be here described.
To effect the starting and stoppage of the machine, I in some cases arrange upon
the driving shaft of the same a fast and loose pulley; I prefer however the
following arrangement, that is to say, I arrange upon the said driving shaft a loose
pulley only whose hub is provided with lateral pins or projections. Adjacent to
the said pulley I fix upon the driving shaft a collar or ring, which has a groove in
it corresponding to a groove in the driving shaft. Within these grooves I arrange
a sliding gib or clutch, which is forced into engagement with the pins on the loose
pulley by a suitable spring, and consequently connects the said pulley with the
shaft to set the apparatus in motion when a treadle is depressed. When it is
desired however to stop the apparatus this may be readily effected by releasing the
said treadle. When this treadle is released, the bevelled or tapered end of a
lever is caused by a suitable weight to pass behind a projection on the aforesaid
gib, and draw the same back, thereby disengaging the aforesaid pulley so that it
runs loose upon the driving shaft until the treadle is again depressed to lift the
bevelled end of the said lever and permit the spring to again act upon the gib.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Frederick Myers in the Great Seal Patent Office on the 30th
December 1881.
FREDERICK MYERS, of the City and State of New York, United States of
America, now of 8, Southampton Buildings, London. "IMPROVEMENTS IN
MACHINERY OR APPARATUS FOR SHARPENING OR FILING THE TEETH OF SAWS."
My Invention relates to machinery or apparatus for sharpening or filing the
teeth of circular or other saws, and consists in various novel features in the
construction of such machinery as hereinafter described and as illustrated in
the accompanying Drawing, in which
Figure 1 is a plan or top view ; and
Figure 2, a side elevation of my improved machinery or apparatus.
Figure 3 is a front elevation partly in section on the line x, x, Figure 2, of.
portions of the said apparatus.
Figure 4 is a front elevation of the saw holding bracket or face plate.
Figure 5 is a horizontal section of the said face plate with the saw holding centre
stud or piece in the slot thereof.
Figure 6 is a front elevation of my improved starting and stopping apparatus
hereinafter described; and
Figure 7, a plan of a portion of the same.
Figure 8 is a plan partly in section of a treadle and adjacent parts for operating
portions of the said apparatus.
Figure 9 is a side elevation of a modified construction of the saw holding
bracket; and
Figure 10 is a similar view of another modification of the same, and also
represents a modified device whereby the twisting or buckling of the saw is
prevented.
Like letters indicate the same parts throughout the Drawing.
In carrying the said Invention into practice, I mount in suitable front and rear
bearings a¹, a², attached to a bracket a on an upright standard or support ba
longitudinally reciprocating shaft c, whose forward end is provided with a disc or
plate d, to which a file carrier or holder e is secured. The front end of this shaft
which slides through the bearing a¹ is round, and the rear end of the said shaft is
square and slides through a square hole in the bearing a², so that the rotation of
the said shaft upon its axis is prevented. To the rear end of the said shaft I
attach one end of a connecting rod f, whose other end is fitted to a crank-arm g
upon a horizontal driving shaft h; this shaft is supported in fixed bearings a³ upon
the bracket a, and is provided with a driving pulley i. The crank-arm g is
provided with a slot g¹ to permit the front end of the connecting rod f to be
adjusted and secured nearer to or farther from the centre of the driving shaft, to
decrease or increase the longitudinal throw of the aforesaid reciprocating shaft and
the file-carrier e, and file j.
To permit the said file-carrier to be turned upon its axis to give the file any
desired cant or inclination laterally, I provide a disc e' formed on or attached to the
said carrier, and abutting against the disc d on the longitudinally reciprocating
shaft c; this disc e¹ has a semi-circular slot c² (see Figure 3), through which a screw
passes into a tapped hole in the disc d. By loosening this screw the file-carrier and
file may be readily turned into the desired position, and when so adjusted may be
secured by again tightening the said screw.
To limit the downward movement of the file j toward the saw k to be filed or
sharpened, and consequently to ensure uniformity in the depth of the teeth of the

page_text: same, I pivot the jaws 1, 1, between which the said file is clamped) to the lugs e of
the file-carrier or holder c, and pass through an arın or piece e projecting forwardly
from the disc el, a set screw m with which the lower jaw comes in contact when
the file is depressed. By the adjustment of this screw m the downward movement
of the file into contact with the saw may be readily regulated or determined. The
file is provided at its forward end with a handle j, to permit the said file to be
readily raised from or forced into contact with the saw to be sharpened or filed.
To support a saw in the proper position to be acted upon by the file, I arrange upon
the standard 6 of the apparatus a bracket or support n which carries a face-plate n'
which has a vertical slot n². Through this slot passes the shank of a centre
piece o upon which the saw is placed, the said centre piece or stud o being made
conical, so that saws having central holes of different diameters may be readily
placed thereon. Through this conical piece passes a screw o' which carries at its
forward end a clamp o adapted to press the saw firmly upon the conical centre-
piece when the nuts o³ are screwed up, one into contact with the said clamp and
the other against the rear surface of the face-plate. By adjusting the conical piece
and the parts carried thereby up or down within the slot n² in the face-plate, saws
of various diameters may be brought into the proper position to be operated upon
by the reciprocating file j.
To prevent the buckling or twisting of the upper part of the saw when submitted
to the action of the file, I in some cases arrange on the rear side of the said saw an
adjustable set-screw p which when the saw is clamped in position is set up against
the rear surface of the saw near its periphery, as shown in Figure 2.
To permit the saw to be adjusted laterally, I in some cases pivot the aforesaid
face-plate n to the bracket n at its upper and lower extremities, as shown in
Figure 9, so that by turning the said face-plate upon its pivots no, the saw may be
be so adjusted in relation to the file that the front or cutting surface of the teeth of
the saw when sharpened will have any desired angle laterally or transversely. I
prefer also to provide the bracket or support n with a split collar n³, which may be
clamped upon the standard b by means of a screw passed through the lugs n' on
the said collar, so that the said bracket or support may be swung around on the
said standard to bring the saw into the desired position and then clamped in
position upon the latter. The said collar may be arranged above a collar b
attached to the standard b, and I prefer to provide the portion b² adjacent to the
said collar with a graduated scale, so that the angle of inclination of the saw with
respect to the longitudinal axis of the file may be readily gauged or ascertained.
In the modification shewn in Figure 10 I dispense with the slotted face-plate n³,
and provide for the requisite vertical adjustment of the centre-stud o, to enable
saws of different diameters to be filed or sharpened on the same machine by so
arranging the bracket or arm n that it may be moved up and down upon the
standard b. The said centre-piece is attached to a piece n* pivoted to the bracket
or arm n by which I am enabled to obtain the desired angle of the upper face and
the front of the teeth.
In Figure 10 I have also shown an arm p¹ which is attached to the standard b,
and is designed to take the place of the steadying screw p hereinbefore described.
When my machine is employed for sharpening other than circular saws, the devices
for holding such saws will be somewhat modified, but as the necessary modifications
for this purpose will be obvious they need not be herein described.
To effect the stopping and starting of my improved machine, I in some cases
arrange upon the driving shaft of the same a fast and a loose pulley, as shewn in
Figures 1 and 3 of the Drawing. I prefer however to employ the devices illustrated
in Figures 6, 7, and 8 for this purpose; that is to say, I arrange upon the driving
shaft a loose pulley g, whose hub provided with lateral pins or projections q
Adjacent to the said pulley I fix upon the said driving shaft a collar or ring
which has a groove in it corresponding with a groove in the driving shaft. Within
these grooves I arrange a sliding gib or clutch s which is forced into engagement
with the pins q₁ on the loose pulley by a suitable spring (not shown in the

page_text: Drawing), and consequently connects the said pulley with the shaft to set the
apparatus in motion when the treadle t is depressed and a weighted lever u is
raised. When desired the apparatus may be readily stopped by releasing the
said treadle so as to allow the weighted lever to fall.
One end of the said weighted lever is bevelled or tapered, and when the same is
allowed to fall on the release of the treadle this bevelled end will assume such a
position with relation to a projection s¹ on the gib 8, that the said projection will
be caused by the revolution of the shaft to come in contact with the said bevelled
end of the lever u and be drawn back, thereby disengaging the pulley q, so that it
runs loose upon the driving shaft, and the machine is stopped until the treadle is
again depressed to lift the bevelled end of the said lever, and permit the spring to
again act upon the gib.
The treadle t and weighted lever u are connected by a rod, one end of which is
attached to the pin of the treadle arm or crank v, and the other end to the
pin on the short arm of the said lever.
Having thus fully described my said Invention, and the manner of performing
the same, I wish it understood that I claim,―
First. In a machine or apparatus for sharpening or filing the teeth of saws, the
file-clamping jaws hinged to lugs upon the disc e', which may be turned upon the
disc or plate d attached to the reciprocating shaft, and is provided with the arm e¹
carrying the set-screw m, these devices being mounted on a standard and combined
with a saw-holding device also mounted on the said standard, substantially as
above set forth.
Second. The face-plate provided with the steadying screw p and the centre-stud
in combination with the bracket n and the standard, the said bracket being laterally
adjustable on the said standard, and the latter having a reciprocating file-carrier
mounted upon it, substantially as above set forth and for the purpose specified.
Third. The combination of the adjustable conical centre-stud, the clamp o², the
screw o¹, and the nuts o³ with the slotted face-plate and the steadying screw or
rest, substantially as above set forth and for the purposes specified.
Fourth. The modification of my Invention illustrated in Figure 10 of the
Drawing, wherein the face-plate is dispensed with, and the centre-stud is attached
to the piece n*, substantially as above set forth and for the purpose specified.
Fifth. A saw sharpening or filing machine or apparatus consisting of the parts
constructed, combined, and operating, substantially as above set forth and arranged
to be stopped and started by the employment of the fast and loose pulleys, or by
the mechanism described with reference to Figures 6, 7, and 8 of the accompanying
Drawing.
In witness whereof, I, the said Frederick Myers, have hereunto set my hand
and seal, this Seventeenth day of December, in the year of our Lord One
thousand eight hundred and eighty one.
FREDERICK MYERS. (L.S.)