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UNITED STATES PATENT OFFICE.
ROBERT S. HUNGER, OF MEXIA, TEXAS.
SAW-SHARPENING TOOL.
SPECIFICATION forming part of Letters Patent No. 265,854, dated October 10, 1882.
Application iled March 3, 1882. (No model.)
To all whonm it 1Ima concern: supported in a suitable frame, and B is the
Be it known that I, ROBERT S. MUNGER, of tool, secured to one end of the mandrel.
Alexia, in the county of limestone and State When the helical or self-feeding form shown
of Texas, have invented a new and useful lm- in Fig. 2 is used the saw will be fed by the 55
5 pirovemenut in Sharpening-Tools for Cotton- file, which will pass from one tooth to an-
Gin and other Saws, of which the following other at each revolution of the file. When the
is a full, clear, anld exact description, reference concentric form is nsedadditional means will
being had to the annexed drawings, forming be supplied for feeding the saw to the tool.
part of this specification. Fig. 3 shows the file with the rim bodily in- 60o
so My invention consists of a rotary tool hav- clined inward toward the axis of the tool.
ing an annular rimora curved rim, madeeither Fig-. 4 shows thinner side of the rim made
concentric or helical, and with one or both fil- straight or parallel with the axis, and the
ilg-s urfaces of the rim inclined inward from outersurface beveledorinrclined inward. This
beel to edge toward the axis of the tool, where- form is best adapted for using emery or other 65
I5 by the rim is adapted to give to the face or face grinding materiaI to form the filing-surface.
and throat of asaw-tooth'asmooth convex sur- In the helicalor self-feeding tool I design to
face to prevent it from cutting or napping the use either a straight inside surface, with the
fint. outside surface inclined inward, or with both
In the drawings, Figure 1 isa side elevation surfaces inwardly inclinedas shown in Figs. 2 7o
20 ofasaw-sharpeningmachine, showing the [nan- and 3, respectively. If desired, the innersur-
ner of applying my improved sharpening-tool face of the helical tile, whether straight or ber-
to use. Fig. 2 is a plan of a helical or self- ele(d, lay blie file-cut before the metal is bent
feeding tool detached from the mandrel. Fig. to form the tool, since thle operation can be
3 is a side elevation of a concentric tool, partly easily performed at such stage. 75
25 in section, showing reversible cutting-edges. In Figs. 5, 6, 7, and 8 the body of the tool
Fig. 4is a similar view, showing the inner cut- is slightly modllfied to show various modes of
tinr-surface made straight instead of inwardly attaching it ti a mandrel. I do not, however,
inclined; and Figs. 5, 6, 7, 8 are sectional claim ini this application any speoeil leans of
views,showing differentmodesof attaching the attaching the tool to a mandrel, but limit my 8o
30 tool to a mandrel. claims to the tool.
Heretofore a rotary tool for sharpening cot- Having tus described my invention, what I
ton-gin saws has been constructed with a flar- claim, and desire to secure by Letters Patent,
ing or bowl-shaped file, with a view to sharp- is-
riring the teeth with rapidity and regularity; 1. A rotary saw sharpeining tool having a 85
35 but with the flaring or bowl shape nothing bat crved edge-shap ed rim provided with tiling-
a sharp edge can be given to the throat anti surfaces oil the edge and each side thereof, one
no practical convexity to the face. or both irf which sides are inclined inwardly
To prevent the teeth of cotton-gin saws from from heel to edge toward the axis of the tool,
cutting or napping the lint, it is essential substantially as rrd for theparpose described. 9o
40 that the face and throat of the tooth shall be 2. A rotary self -lfeedin saw-sharpningtool
smooth and convex, so as to present no an- having ar edge-shapei rimn f helical form pro-
gnlar or sharp edges to the fiber. I therefore vided with a file cut onr the edge and sides
construct the file with its rim or cutting-edge thereof, one or both of ihich sides are in-
inwardly inclined, so that when rotated in wardly inclined from heel to edge toward the 95
45 contact with the throat and face of the tooth axis of the tool, substantially as and for the
it will give them a convex foriti. The file is purpose described.
cut on the outer surface as well as the inner ROBERT S. MlUNGER.
surface, so as to reduce the back of the tooth
at the same time the face is reduced. Witnesses:
50o The manner of applying the tool to use is C. H. MaUNGE,
shown in Fig. 1, in which A is the mandrel, BERNT JOHNSON.
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Munger, Robert S. Saw-Sharpening Tool, patent, October 10, 1882; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth170426/m1/3/: accessed July 10, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.