IMPROVEMENTS IN CONSTRUCTION OF MACHINES FOR CUTTING FILES AND RASPS to be as follows:
Year: 1885

page_text: RICHARD DENISON 2 Malvern View Villa Cheltenham Gloucestershire Mechanical
Engineer does hereby declare the nature of his invention for "IMPROVEMENTS IN
CONSTRUCTION OF MACHINES FOR CUTTING FILES AND RASPS to be as follows:-
"
My invention relates to Improvement in machines for cutting files and rasps
and more particularly in the method of
A.-Securing the cutting chisel whereby the variation in the angle of the cuts,
neccessary are obtained, without alteration of, or resetting the machine.
B.-Securing the file or rasp more firmly to the bed on which it is placed for
being cut.
A. The chisel is made with a round shank which fits into a socket of similar
size and shape constructed in a sliding piece that receives the blow or. pressure
whereby the tooth is cut, the effect of this shank being round, is that it can be
set to any required angle, and this angle being ascertained it is kept in that
position by a set screw & gib which is screwed through the socket and bears on a
flat, which is made on the side of the round shank before referred to: by having
chisels with these flats in various positions I am enabled: by simply changing the
chisel to obtain any difference of angle that may be required: as for instance in
the upcut and overcut of a file.
:.
B. The tang of the file or rasp is placed in the eye of a holder shaped somewhat
like a needle but with the eye more swelled out. This holder is recessed into the
bed, whereon the file rests. The downward presure, neccessary being obtained by
a spring, also recessed into the bed, connected with this holder and spring is a lever
so arranged that when tne bed is with drawn, on the completion of the cutting of
the file, the tension of the spring is relaxed allowing the file to be easily with-
drawn, and further when the point of the file is being cut, allowing the tang to rise
gradually, the effect being, that that part of the file which is immediately under
the cutting chisel always bears close on to the file bed, a very important point.
Dated this first day of January 1885.

page_text: COMPLETE SPECIFICATION.
Improvements in Construction of Machines. for Cutting
Files and Rasps.
RICHARD DENISON 2 Malvern View Villas Gloucester Road Cheltenham
Gloucestershire Mechanicl Engineer, do hereby declare the nature of his
invention for IMPROVEMENTS IN CONSTRUCTION OF MACHINES FOR CUTTING FILES
AND RASPS and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
My Invention relates to improvements in Machines for cutting files and Rasps,
and more particularly in the method of
A. Securing the cutting chisel, whereby the variation in the angle of the cuts
necessary are obtained, without alteration, or resetting the Machine. (1) different
grades of files (2) the up cut and overcut of any file.
B. Securing the files or Rasps more firmly to the bed, on which it is placed
during the operation of cutting, and releasing the file automatically.
Drawing No 1 the chisel D is made with a round shank, which fits into a socket
of similar size and shape in the sliding piece E. that receives the blow or pressure
whereby the tooth is cut, it will be seen that the shank been round, the chisel can
be turned to any required angle, and the angle been ascertained, the chisel is kept
at this angle by the set screw F. the point of which screws tight up against a flat G
in the side of the shank before referred to, by having chisels with these flats in'
various positions with respect to the cutting edges, it is obvious that any difference
of angle required, can be obtained. These two improved methods are more
particularly applicable to those file or rasp cutting machines in which the file or
rasp is laid on a bed which is propelled backwards automatically, under the cutting
chisel which is raised and dropped conveniently, and which is held in a block or
sliding piece, which receives the necessary force or blow, whether from a spring, or
some suitable means that cut the tooth.
B. Drawing No 2. The tang of the file or rasp H, is placed in the eye of a
holder I, which is recessed into the bed M, whereon the file is laid during the
operation of cutting, the downward pressure necessary to hold the file tight on the
bed, is obtained by the spring S as shown, or by some similar arrangement in order
that the file or rasp may be released automatically, an arrangement somewhat as
shewn is adopted in which K is a lever attached to the eye I, and with one arm
terminating in a roller L, which runs freely on the fixed part of the bed N as the
moveable part of the bed M M travels back tooth by tooth, the other end of the
lever may terminate in an eye and pin P, forming the fulcrum, or it may terminate
in a roller similar to that on the one side L, by placing a piece of metal, or other
suitable substance on the fixed part of the bed N, in any desired position in the
path of the roller L, the lever K is raised and the pressure of the spring S on the
tang of the file is relaxed, this effect may be produced suddenly by having the
piece of metal or other substance, shaped square like a step or gradually by having
this piece wedge-shaped, like an inclined plain.

page_text: Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
Firstly. The method in which the chisel and slide is fitted and described
substantially for the purpose herein set forth.
Secondly. The combination for holding the tang of the file with the levers and
springs substantially as shewn and described.
Thirdly. The arrangement and construction of parts constituting the improve-
ments in Machines for cutting files and Rasps substantially as shewn and described.
In witness whereof I the said Richard Denison have hereunto set my hand
and seal this fifteenth day of September in the year of our Lord one
thousand eight hundred and eighty five.