IN APPARATUS FOR GUIDING FILES IN CUTTING SAWS
Year: 1876

page_text: LETTERS PATENT to William Spence, of 8, Quality Court, Chancery Lane, in
"IMPROVEMENTS
the County of Middlesex, Patent Agent, for the Invention of
IN APPARATUS FOR GUIDING FILES IN CUTTING SAWS." A communication
from abroad by Elias Roth, of New Oxford, in the County of Adams, and
State of Pennsylvania, one of the United States of America.
COMPLETE SPECIFICATION filed by the said William Spence at the Office of
the Commissioners of Patents on the 13th July 1876.
WILLIAM SPENCE, of S, Quality Court, Chancery Lane, in the County of Mid-
dlesex, Patent Agent. "IMPROVEMENTS IN APPARATUS FOR GUIDING FILES IN
CUTTING SAWS." A communication from abroad by Elias Roth, of New Oxford, in
the County of Adams, and State of Pennsylvania, one of the United States of
America.
This Invention relates to improvements in saw-file guiding apparatus, by which
each tooth on a saw may be produced with the same bevil and pitch, and be refiled
accurately at any time with the same bevil and pitch, so that the saw cuts evenly
and effectively throughout its full length.
The Invention consists in an adjustable indicator placed on a sliding rod and
file, in order to set the latter to the pitch required for the teeth.
In the accompanying Drawing Fig. 1 represents a top view of the improved saw-
file guide; Fig. 2 a side elevation, partly in section, on line c, c, Fig. 1; Fig. 3 a side
view of the indicator for setting the file to the desired pitch; and Fig. 4 a vertical
transverse section of the guiding device on the line, x, Fig. 1.
In the Drawing A represents a straight or arc-shaped clamp of sufficient length
into which the saw blade is clamped by means of a vice, screws, or otherwise. The
clamp a is provided with longitudinal side grooves a at some distance below its
bevilled edges, for the purpose of guiding the bed or frame B that extends in yoke-
The bed B
shape over the clamp, and runs by end studs or rods 6 in the grooves a.
supports by lugs or flanges & at one side, and a set screw d at the opposite side, the
graduated ring or circle C, which is readily adjusted to any angle on the bed by
means of an indicator e of the same, so that thereby the file may be set to any
desired bevil of the teeth. A file guiding rod D passes through diametrical holes
of ring C, and carries the file holding arms E attached adjustably thereto by clamp
Price 4d.1

page_text: screws f. One of the file supporting arms E has a ferrule of sufficient size to allow
the insertion of the file, which is rigidly secured thereto at the handle ferrule by a
clamp screw g, the other arm being provided with a socket hole on an adjustable
clamp E¹ for the end of the file.
By loosening the clamp screw g of the file the same may be readily turned so as
to give any desired pitch to the teeth of the saw.
An indicating or pointing device F, with a recess h at one end, and a pivotted
picce h¹ with straight lower edge, made adjustable to a graduation at the main
part at the other end, is placed on the slide rod D, and the file, as shewn in Fig. 1,
and the file then turned in the arms to be adjusted to the inclination of the pivot-
piece, and give thereby at all times a correct pitch to the teeth when either a
new edge to the file is to be used or an entirely new file inserted.
The guide is applicable to circular as well as straight saws, the clamp being in
the former case of circular shape, and the guide rods or studs of the bed frame being
inade of arc shape to slide in the grooves of the clamp.
After the bevil of the teeth is set on the graduated ring and the pitch, by means
of the indicator, the clamp screws are tightened and the teeth filed at one side.
For filing the other side of the teeth the sliding frame is taken out of the grooves
and changed to bring the file to the other side of the saw. The sliding frame is
then. re-inserted into the grooves, and the file set to the same bevil and pitch of
teeth as before.
The file will then give to each tooth the same bevil and pitch on both sides
producing the effective cutting of the saw throughout its length.
By pivotting the rod D of the file frame in the ring C, the front of the file can
be raised, and the rear thereof depressed on the forward movement thereof, so as
to always cut the forward or cutting edge of tooth to a greater bevil than the
rear edge, while on the rear movement of the file frame the file can be conveniently
raised from the saw and prevented from acting upon the tooth.
What I claim as new and of the Invention communicated to me from abroad as
aforesaid is, the combination of the file and sliding rod of the file carrying frame
with a graduated indicator having an adjustable piece at one end, and a recess or
clamp at the other, as and for the purpose specified.
In witness whereof, I, the said William Spence, have hereunto set my hand
and seal, the Thirteenth day of July, in the year of our Lord One thousand
eight hundred and seventy-six.
WILLIAM SPENCE. (LS.)