Year: 1887

page_text: Date of Application, 1st Apr., 1887
Specification Accepted, 31st Mar., 1888
of luscumbia, Colbert County, ad, W.,
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex, M.I.M.E.
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 :-
This invention has relation to files; and it consists in the improved construction
and combination of paris of a file having its teeth cut to extend half way across the
face from each edge and at an angle to each other, and having a longitudinal groove
in the middle of each face, as hereinafter more fully described.
Reference being had to the accompanying drawings: Fig. 1 is a perspective view
of one form of this improved file.
Fig. 2 is a face view of the same. Fig. 3 is a cross section. Fig. 4 is a perspective
view of another form of the file and Fig. 5 is a cross section of the same.
Similar letters of reference indicate corresponding parts in all the figures.
In the accompanying drawings the letter A indicates the body of the file the teeth B
of which are cut at an angle to the edge of the file and extending only half-way across
the face of the file so that the two halves of the file will have their teeth inclined in
opposite directions..
A groove C is cut longitudinally in the middle of the file and may be smooth
or have the teeth of the face continued into it, and the cross section of the groove
may either be round, V-shaped, rectangular, or any other shape which may be found
preferable.
In using this file it will be found that the dust or chips from the filing will be
carried towards the central groove by the converging teeth, and the dust and chips
will be carried along the groove to the end of the file so that the file will keep itself
clean and free from dust and chips enabling the workman using the file to continue to
file without removing the file from the work for the purpose of cleaning it, the file
cleaning itself without having to be taken off from the work,

page_text: The form of the filo may be different according to the purpose of the file either both
faces being flat, one face flat and the other half-round, one face convex and the other
face concave half-round, or any other shape which the labor to which the file is to be
used may require, the improvement consisting in the longitudinal groove in the centre
of the face of the file.
In figure 4 is shown a file having half-round faces, one being convex and the other
concave, and the tang or shank D projects from above the convex side of the file
so as to bring the handle above the surface, upon which the concave face is used and
consequently bring the hand above it allowing the file to be used for large surfaces.
It follows that the tang may project in this manner from files having a flat face and a
half-round face or from one side of a file having two flat faces the object of having
the tang projecting in that manner being to bring the hand above the surface to be
filed, enabling large surfaces to be filed without bringing the hand of the operator in
contact with the surface.
Having now particularly described and ascertained the nature of the said invention,
as communicated to me by my foreign correspondents, and in what manner the same
is to be performed, I declare that what I claim is:
1. A file having the teeth upon its faces so cut that they extend half way across
the faces, meeting at their inner ends at an angle and having a longitudinal groove at
the meeting ends of the teeth as and for the purpose shown and set forth.
2. A file having its tang projecting rearwardly from one face above the other face
of the file, as and for the purpose shown and set forth..
3. A file having a half-round convex face with a tang projecting from one end of
the said convex face above the same as and for the purpose shown and set forth.
4. A file having an upwardly and rearwardly bent tang projecting from the end of
its half-round face as and for the purpose shown and set forth.
11.