Improvements in and relating to Files.
Year: 1897

page_text: Date of Application, 14th Oct., 1897
1000
PROVISIONAL SPECIFICATION.
Improvements in and relating to Files.
WILLIAM JUNGE, of 43, Guilford Street, London, W.C., Engineer, do hereby
declare the nature of this invention to be as follows:-
This invention relates to improvements in files, and chiefly consists in providing
the same with ribs, along the crest of which the teeth are formed. The spaces
between such ribs afford sufficient space for the filings, whereby the efficiency of
the file is increased.
In carrying my invention into effect I provide a file blank on one or more sides
thereof with slanting ribs having an inclined front, which may join the back
either by a straight, curved or crooked line, such ribs being preferably produced
by rolling, but may also be formed by forging, stamping, pressing, milling,
grinding, filing or the like. Along the crest of the ribs and at right or approxi-
mately right angles to the sides of the file I form single cut teeth in the customary.
way by means of a chisel. By cutting teeth upon the crest of a slanting rib
which has an inclined front such teeth are sufficiently raised so that the front
will not interfere with the cutting action of the file.
Owing to the construction of my improved file it will do more work with the
same expenditure of power, and the cost of manufacture will not be greater than
that of an ordinary file.
1000
Improvements in and relating to Files.
I, WILLIAM JUNGE, formerly of 43, Guilford Street, London, W.C., now of
51, Barcombe Avenue, Streatham Hill, London, S.W., Engineer, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
My invention relates to files, and chiefly consists in providing the same with
ribs having an inclined front, the teeth being formed along the crest of such
ribs. In the files heretofore made with ribs the front of these ribs is perpen-
dicular to the body of the file and the broken breasts of the teeth form part of
the said front. This arrangement has several defects which my aforesaid inven-
tion is designed to remedy.

page_text: Fig. 1 represents a plan of a file to an enlarged scale.
Fig. 2 is a side elevation of the same.
Fig. 3 is a cross section on the line -, Fig. 1, showing an increased number
of teeth.
Figs. 4, 5, 6 and 7 show different shapes of the ribs.
In carrying my invention into effect I provide the blank or body a of the file,
Figs. 1, 2 and 3, on one or more sides thereof with ribs having an inclined
front which may join the back of the ribs either by a straight line, Fig. 4, a
curved line, Fig. 5, or a crooked line, Figs. 6 and 7, such ribs being preferably
produced by rolling, but may also be formed by forging, stamping, pressing,
grinding, filing, or the like. In Figs. 4 and 7 the front and back of the ribs mees
at an angle, and in Fig. 5 in a curve, whereas in Fig. 6 they are joined by a
intermediate plane. The inclined front c may form either the whole front of the
ribs, Figs. 4, 5 and 6, or only part thereof, Fig. 7. Between the ribs remain
grooves of suitable shape, which afford ample clearance for the filings. Along
the crest of the ribs and with their breasts or flat faces, at right or approximately
right angles to the sides of the file I form single-cut teeth e in the customary
way by means of a chisel. By cutting teeth along the crest of a slanting rib which
has an inclined front as set forth, such teeth will be sufficiently raised so that
the front will not interfere with the cutting action of the file, and yet enable the
teeth to bite consecutively so that each will do its full duty.
As shown in Figs. 1, 2 and 3, the teeth of this file have an unbroken breast f.
It is obviously not necessary that the ribs and grooves should run only parallel
and in the same direction, as for instance they may slant forwards or backwards
to the centre line and then take a backward or forward direction to the opposite
side of the file, or else they may cross each other, but in either case the file cut
will be at an angle to the sides of the file.
For heavy files, coarse teeth and rough work the ribs in Figs. 4, 5 and 7 are
preferable, whereas for smooth files and smooth work those in Fig. 6 will be best
adapted.
A file having ribs as shown in Figs. 4, 5 and 7 and furnished with a more or
less coarse cut will replace a rasp, over which it possesses the great advantage of
providing for more space for the waste.
Owing to the construction of its teeth my improved file will do more work than
the files hitherto employed with the same expenditure of power, and the cost of
manufacture will not be greater than that of an ordinary cross-cut file.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:
A file having ribs which present wholly or partly inclined fronts, and which
are furnished with teeth possessing an unbroken breast, substantially as set
forth.
1000