Improvement in Dissectible Files.
Year: 1889

page_text: Date of Application, 28th Oct., 1889
Complete Specification Left, 28th May, 1890-Accepted, 5th July, 1890
PROVISIONAL SPECIFICATION.
Improvement in Dissectible Files.
We, LUDWIG MÜLLER, Engineer, residing at No. 14 Löbauer Strasse Dresden,
Kingdom of Saxony, and the Company DEUTSCHE PATENTFELLEN-FABRIK MEYER,
FOCKE & Co., of the same place, Nordstrasse 21 do hereby declare the nature of this
invention to be as follows:-
Our invention relates to files which are composed of an iron body having the form
of a file, and one or more thin plates of steel provided with a file-cut and detachably
secured to the former.
These files as heretofore manufactured, present the inconvenience that the said
steel plates are very apt to crack, especially while being hardened. For the purpose
of obviating this deficiency, we make the plates of a layer of iron and one or two
layers of steel welded to the former, the said layer or layers of steel being thereupon
provided with the cut.
Dated the 28th day of October 1889.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvement in Dissectible Files.
We, LUDWIG MÜLLER, Engineer, residing at No. 14, Löbauer Strasse, Dresden,
Kingdom of Saxony, and the Company DEUTSCHE PATENTFEILEN-FABRIK MEYER,
FOCKE & Co., of the same place, Nordstrasse 21, 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 :-
Our invention relates to files which are composed of an iron body having the form
of a file, and one or more thin plates of steel provided with a file-cut and detachably
secured to the former.
These files as heretofore manufactured, present the inconvenience that the said steel
plates are very apt to crack, especially while being hardened. For the purpose of
obviating this deficiency, we make the plates of a layer of iron and one or two layers
of steel welded to the former, the said layer or layers of steel being thereupon provided
with the cut.
In the annexed drawing fig. 1 shows in sectional side-view a flat file to which our
invention is applied. Fig. 2 is a top-view corresponding to fig. 1, and fig. 3 a top-
view of a portion of the body of the file. Fig. 4 is a transverse section on line 1, 2,
fig. 2, drawn to a larger scale. Fig. 5 shows different forms of file-bodies and of the
plates to be used therewith.
In these figures a is the body of the file and 6 are the plates provided with the cut.
The body a has at one end the fixed projections c and at the other end the sliding
piece d with the projections c', the said projections c and c¹ being undercut in dovetail
form at their respective fore and rear sides, while the plates have holes corresponding
to the projections c c¹, so that when the plates are booked on the latter, and the
piece d is drawn outward by means of the screw e, passing through the handle f, both
plates are pressed tightly against, and secured to the body a.
As shown by the section, fig. 4, the plates 6 are composed of three layers 1, 2, 3 ;
the layers 1 and 3 being made of steel and the layer 2 of wrought-iron, and all three
layers being welded together and rolled to the desired thickness. The plates may,
however, also have but one layer of steel. If there are two such layers, both can be

page_text: provided with file-cuts, so that the plates are then reversible. This arrangement is
preferable for flat and square files, while plates of the forms shown by fig. 5, which
can be cut on one side only, are ordinarily made with but one layer of steel.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is:
In a dissectible file, the combination of the body u, the plate or plates & composed
of one or two layers of steel and a layer of iron welded together, the said layer or
layers of steel being subsequently provided with file-cuts, and means for detachably
securing the plate or plates to the body a, substantially as and for the purpose
specified.
Dated the 28th day of May 1890
HASELTINE, LAKE & Co.,
45. Southampton Buildings, London, Agents for the Applicants.