AN IMPROVED MACHINE FOR CUTTING FILES
Year: 1876

page_text: LETTERS PATENT to Maurice Mondon, of Paris, in the Republic of France, but
temporarily of 4, South Street, Finsbury, in the County of Middlesex, Civil
Engineer, for the Invention of "AN IMPROVED MACHINE FOR CUTTING FILES."
Sealed the 8th June 1877, and dated the 13th December 1876.
PROVISIONAL SPECIFICATION left by the said Maurice Mondon at the Office
of the Commissioners of Patents on the 13th December 1876.
MAURICE MONDON, of Paris, in the Republic of France, but temporarily of
4, South Street, Finsbury, in the County of Middlesex, Civil Engineer.
PROVED MACHINE FOR CUTTING FILES."
"AN IM-
This Invention relates to improvements on former Letters Patent granted to
me, dated the Seventh day of October, One thousand eight hundred and seventy-
four, No. 3426.
The present improvements consist,-
Firstly. In the means of keeping the files on the anvil. For this purpose I do
away with the draw rods or supports. The anvil rests on a suitably placed block,
and the file is kept in position by means of a spring terminated by a small roller
rolling on the file, keeping it level. This spring is attached to the lower part of
the piece which slides between the vertical bearings of the cam shaft. Or I may
employ a lever, one end of which is fixed by means of a spring book or any other
suitable stop when the file is to be withdrawn, or for other purposes.
Secondly. In the means of varying the force of the blow of the hammer according
to the breadth of the file to be cut. For this purpose I introduce between the
moveable carriage supporting the file a partly toothed rack, the teeth of which gear
into the teeth of a long vertically placed pinion, which is turned in proportion as
the breadth of the file increases. This pinion is mounted on a shaft provided with
a screw, the object of which to vary the position of the hammers with regard to
the cam shaft in relation to the point where the cams reach the hammer handle.
From this arrangement the hammer has a greater length of play, and consequently
strikes so much a heavier blow as the striking point is further removed from the
centre of the cam shaft. The tail end of the handle bears on a spiral or blade
spring, which sends it back at each blow, if it is necessary that the blow should be

page_text: increased. When the broad part of the file is reached the action of the rack ceases,
and the blows become uniform directly the untoothed part of the rack is reached,
which position corresponds with the point where the width of the file is even.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Maurice Mondon in the Great Seal Patent Office on the 13th June
1877.
MAURICE MONDON, of Paris, in the Republic of France, but temporarily_of
"AN IM-
4, South Street, Finsbury, in the County of Middlesex, Civil Engineer.
PROVED MACHINE FOR CUTTING FILES."
This Invention relates to improvements on former Letters Patent granted to me,
dated the Seventh day of October, One thousand eight hundred and seventy-four,
No. 3426.
The present improvements consist,-
Firstly. In the means of keeping the files on the anvil. For this purpose I do
away with the draw rods or supports. The anvil rests on a suitably placed block,
and the file is kept in position by means of a spring terminated by a small roller
rolling on the file, keeping it level. This spring is attached to the lower part of
the piece, which slides between the vertical bearings of the cam shaft. Or I may
employ a lever, one end of which is fixed by means of a spring hook or any other
suitable stop when the file is to be withdrawn, or for other purposes.
Secondly. In the means of varying the force of the blow of the hammer according
to the varying breadth of the file to be cut. For this purpose I introduce between
the moveable carriages supporting the file a partly toothed rack, the teeth of which
gear into the teeth of a long vertically placed pinion, which is turned in proportion
as the breadth of the file increases. This pinion is mounted on a shaft provided
with a screw, the object of which is to vary the position of the hammers with
regard to the cam shaft in relation to the point where the cams reach the hammer
handle. From this arrangement the hammer has a greater length of play, and
consequently strikes so much a heavier blow as the striking point is further
removed from the centre of the cam shaft. The tail end of the hammer handle
bears on a spiral or blade spring, which sends it back at each blow, if it is
necessary that the blow should be increased. When the broad part of the file is
reached the action of the rack ceases, and the blows become uniform directly the
untoothed part of the rack is reached, which position corresponds with the point
where the width of the file is even.
But to make my Invention better understood I will now proceed to describe the
same by reference to the accompanying Drawing, in which Figure 1 is a view
shewing the arrangement for keeping the file on the anvil; Figure 2, an elevation,
and Figure 3, part plan shewing the arrangement for varying the blow of the
hammer with the varying width of the file to be cut.
In Figure 1, A is the spring for keeping the file on the anvil; B, the roller of
the spring, which rolls on the file a so as to keep it level. The spring A is attached
under the support of the piece C at the lower part of the piece D, sliding between
the supports of the cam shaft. Instead of this spring I may employ a lever E. In
Figures 2 and 3, F is the rack placed between the moveable carriages (described in
the Specification of my former said Letters Patent), the teeth of which rack gear
with the long vertical pinion G, and turn it in proportion as the file is cut and its
width increases. This pinion G is mounted on a shaft H carrying a screw J, which
causes the position of the hammer to vary with regard to the point where the cams
reach the handle of the hammer. From this arrangement it follows that the
length of the course of the hammer and the force of the blow are so much greater
in proportion as the striking point is moved further away from the cam shaft b.

page_text: The tail end of the hammer L, Figure 1, further bears on the spiral spring M (or a
blade spring M, Figure 5), which sends it back at each stroke, if it is necessary that
the blow should be increased. The spring M, Figure 5, may be moved by the
hand by means of the lever N, the handle of which is fixed in one of the notches O
of one of the racks, shewn in Figure 4, placed on a piece of the sliding pieco
carrying the recesses P of the hammers. The action of the rack ceases and the
blows become uniform directly the untoothed part of the rack is reached, as seen
at R, S, Figure 2, and corresponding with the point where the breadth of the file is
even. At this point the thickness of the rack is reduced, as shewn at T, Figure 3,
thereby allowing the spring V to come against the pinion G and hold it by means
of the two tooth a.
Having thus described my said Invention and the best means with which I am
acquainted for carrying the same into effect, I wish it to be understood that I do
not confine myself to the precise details herein laid down, as the same may be
varied without departing from the peculiar character of my Invention, but what I
do claim is,―
Firstly. The method and arrangement for holding the file on the anvil, as herein-
before described and represented in the accompanying Drawing.
Secondly. The arrangement for varying the force of the blow of the hammer or
hammers, in the manner and for the purpose herein-before described.
In witness whereof, I, the said Maurice Mondon, have hereto set my hand and
seal, this Eleventh day of June, in the year of our Lord One thousand
eight hundred and seventy-seven.
TARTA A