Year: 1889

page_text: . I ALFRED GOLDENBERG of 5 Rue Mazagran, Paris, in the Republic of France,
Mechanician, 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 :-
Up to this time, all machines for cutting files have been arranged to cut only one
at a time. Whatever other improvements have been made in these machines, the
amount of work which they were capable of doing has remained practically the
same.
Now the object of the present invention is so to improve file cutting machines, as to
allow of two files being cut at a time, and the invention consists in a particular
arrangement of file holder which is fixed on the carriage.
In the accompanying drawing:
•
Fig. 1 is a front elevation of a file cutting machine with my improvements adapted
thereto.
Fig. 2 is a side elevation of the same.
The remaining Figures refer to details of which further mention will be made
hereafter.
A is the frame of the machine, B is a hammer, to which is adapted a chisel C,
and F is a carriage. In this carriage is formed a recess to receive the file holder
on which the files blanks are placed." On the sides of the carriage are formed slides
or guides D, which vary in form to suit the thickness of the files to be cut, and act
by means of rods upon an india rubber spring placed inside the frame at the point E,
the compression of which spring acts as a brake upon the hammer, and thus
diminishes or increases the force of the blow, according as the regulating screw V
is raised or lowered in the manner usual in this class of machine.
A lighter or a deeper cut is thus obtained, according to the different thicknesses. of
the files to be cut.
The travel of the carriage and speed of same are regulated by the change gear
situated at H at the back of the machine, and mounted upon an endless screw (or
rack and pinion novement, if preferred), thus communicating the backward or forward
movement to the carriage F.
The file carrier is composed of several distinct parts combined together in such
a manner that each blank to be cut is mounted so as to be capable of separate
oscillatory movement, while at the same time the blanks advance in a perfectly regular
and simultaneous manner.

page_text: The construction of the file carrier is as follows, whatever may be the shape of the
file blank.
G is a cast iron block lying in the recess of the carriage F, and formed with a
longitudinal half round recess, in which is placed a semi-cylindrical support J.
For cutting flat files (see Figs. 3, 4, 5 and 6), two semi circular parallel grooves are
formed on the flat surface of the support J, in which are placed the two file carriers M,
of iron or steel. The upper surface of each carrier is furnished with small plates of
brass N, on which the file blanks Laro secured. The file carriers being half round,
will oscillate transversely, so that during the cut, each file will adjust itself in a
position corresponding exactly with the line of contact of the chisel. Again, in
cutting two files at once, the cut will be more equal, because the chisel having a wider
base to operate upon, will have less tendency to bear harder on one side of the file
than on the other, and thus cause inequality in the depth of cut.
One of the files on the carriers is placed in advance of the other; this difference is
regulated by the obliquity of the cut.
For cutting the backs of half round and round files, in which a series of cuts runs
nearly parallel from the base towards the point, a special apparatus is required, which
permits of the various courses being cut without removing the files (see Figs. 7, 8, 9,
10 and 11).
For cutting half round files, the semi-circular support J is formed with a groove K,
of trapezoidal section, in which are placed the half round file carriers M. When the
file carriers have been placed in the position they are to occupy, melted tin or copper
is run into the groove K, thus forming a bed for the file carriers, without the necessity
for any special adjustment.
In order to produce the various courses of cuts which occur in these files, it is
necessary that each of the file carriers should be capable of turning simultaneously
with the other. To effect this, each file carrier is provided with a pinion P, gearing
with a third central pinion O, the axle of which carries an arm Q, through which
passes a spring bolt S. The spring serves to keep the bolt in the hole in a dividing
plate R, in which it has been inserted, and thus ensures the fixing of the file carriers
at any desired inclination for effecting the different cuts to be made on the files.
It being possible to adjust the position of the file carriers and the arm quite
independently of one another, it will be easy, before beginning to cut one part of a
file, to adjust the apparatus in such a manner that the two files will be presented to
the chisel in a perfectly symmetrical position.
The double segmental rows of round holes in the dividing plate R (Fig. 9), are
intended to regulate the distance apart of the series of cuts, and by fixing the arm Q
by means of the spring bolt S, the file carriers are maintained in the required position
for cutting half round files.
It will be unnecessary to describe the form of file carriers for every variety of files,
as they are all more or less of the nature of one or other by the above described
arrangements.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what, I
claim is :-
1. The application to a machine for cutting files, of means for holding two or more
file blanks to be cut, as set forth.
2. The construction of file blank holder as herein shown and described.