Improvements in File Cutting Machines.
Year: 1896

page_text: Date of Application, 21st Feb., 1896-Accepted, 11th Apr., 1896
COMPLETE SPECIFICATION.
Improvements in File Cutting Machines.
We, LEONHARD ERLENWEIN, and OTTO ERLENWEIN both of 1 Spitelstrasse,
Edenkoben, Rheinpfalz, Germany, Manufacturers, 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:-
Heretofore files of all kinds have been generally cut by hand, as by means of a
chisel and a hammer, or by means of machinery the mechanism of which is so
complicated that after being used for a short time it has to be repaired, and,.
moreover, the machinery is so costly that it is often found preferable to revert to
the cutting by hand. This last method is however, very slow and tedious.
The present machine has been devised to cut files both cheaply and quickly.
On the annexed drawings:-
Fig. 1 is a side elevation and Fig. 2 a front elevation of the machine.
Figs. 3 and 4 show respectively in side and front elevation, the rollers which form
the characteristic feature of this invention.
The machine is constructed as follows:-
The frame a carries two obliquely fluted or grooved rollers b, c, preferably made
of cast steel. The lower roller b is revolved by means of the pulley d whilst the
upper roller is carried in bearings n attached to the screws e, as shown, and
capable of being moved up and down by them in guides made in the frame.
Passed through the cross head g, secured to the frame by studs f, is a large central
screwed spindle around which is coiled a spring held in position at the top by
means of a nut on the spindle h and at the bottom by the collar k¹ and cross
head m.
The tension of the spring can be regulated by means of the nut k.
Both the screws e pass through the cross head m as shown.
The spindle can be turned by means of the hand wheel i so as to adjust.
the relative positions of the rollers. This adjustment can also be done by means
of the screws e.
The powerful spring I always keeps sufficient pressure on the top roller to cause
the teeth of both rollers to cut the file blank.
Should it be desired to cut teeth in a file blank the upper roller is brought so
close to the lower roller that the space left between them corresponds to the
thickness of the thinnest file to be made. When thicker files are to be made
the increased thickness of the blanks is compensated for by the compression of the
spring 1.
Fig. 3 shows the flutings or ribs of the rollers clearly.
Fig. 4 shows the action of the rollers when cutting a file.
The manner of carrying the rollers and adjusting them can manifestly be varied
without departing from the invention.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
consider novel and desire to claim is :-
1. A machine for cutting files consisting of two rollers having their surfaces
obliquely fluted or ribbed so as to, under pressure, form teeth or grooves in the
file-blank, substantially as herein before set forth.

page_text: 2. The arrangement of the screw spindle h, cross bar m, spring I, and screws e for
adjusting the top roller and keeping the pressure thereon, substantially as
herein before described with reference to the drawings annexed.
3. The general arrangement and combination of parts of the machine substantially
as hereinbefore described and shown on the drawings annexed.
Dated this 10th day of February 1806
H. D. FITZPATRICK,
70 Wellington Street, Glasgow, Agent.