A CERTAIN NEW AND USEFUL IMPROVEMENT IN ROTARY CUTTERS
Year: 1882

page_text: LETTERS PATENT to Henri Adrien Bonneville of the British and Foreign
Patent Offices, 8 Rue de la Chaussée d'Antin, Paris, France, and 90 Cannon
Street in the city of London, Patent Agent for an invention of A CERTAIN
NEW AND USEFUL IMPROVEMENT IN ROTARY CUTTERS A communication from
Etienne Salomon and Edmond Armant two persons resident at Montreal in
the district of Montreal and Province of Quebec in the dominion of Canada
.
PROVISIONAL SPECIFICATION left by the said Henri Adrien Bonneville at
the Office of the Commissioners of Patents on the 24th May 1882.
HENRI ADRIEN BONNEVILLE, of the British and Foreign Patent Offices, 8 rue de
la Chaussée d'Antin, Paris France, and 90 Cannon Street in the city of London,
Patent Agent, A CERTAIN NEW AND USEFUL IMPROVEMENT IN ROTARY CUTTERS,
communicated to me by Etienne Salomon and Edmond Armant, two persons
resident at Montreal, in the district of Montreal and Province of Quebec, in the
dominion of Canada,
The invention relates to improvements in that class of rotary cutters which are
used for making slots in metal or other plates, and has for its object to produce
a cutting tool which will go entirely through the plate upon which it is to operate,
without offering any obstruction whatever in the shape of a shaft or axis, and one
which will completely finish the slot from one side of the article, and thus avoid
the necessity of filing or otherwise working out the corners.
Heretofore, in cutting tools of this description, it has been absolutely necessary
for the rotary cutter to have a shaft through its centre to serve as an axis for it to
revolve upon, and thus it has been impossible to cut right through the plate
without leaving the corners incomplete, or necessitates a double set of cutters, or
requires the plate or article to be reversed and the operation again performed from
the opposite side.
It will at once be seen that the reason of this is, that however small the shaft or
spindle of the rotary cutter may be in proportion to its diameter, said cutter

page_text: cannot pass through the material upon which it is operating further than the
outer diameter of its shaft will allow, thus leaving uncut a part of the slot equal to
at least half the diameter of the cutter shaft.
The invention consists broadly in substituting for a shaft as a means for the
cutter to revolve upon, a pair of eyes or lugs projecting from the cutter stock, and
counter sunk in said rotary cutter so that they may not be more than flush with
the sides of same, and in rotating said cutter by means of a gear wheel inter-
meshing with the teeth of said cutter.
For more complete comprehension of the invention however, reference must be
had to the accompanying drawing in which letters of reference similar to those
used in this specification, indicate like parts.
Fig 1. is an elevation of a cutter stock arranged with driving shaft to operate
according to the invention Fig. 2 a transverse sectional elevation of the same;
Fig. 3. an end view, showing also in dotted lines, a brush for clearing cutter teeth,
and Fig. 4 a sectional detail of a modification of the invention
A represents any ordinary or suitable cutter stock but preferably of somewhat
the shape shown, and made with a removable piece B, C is an eye for fixing the
cutter stock to a machine or table; it is obvious however, that different means of
attachment may be used at discretion or according to circumstances. The removable
piece B is attached to the cutter stock proper by a screw B¹ or other suitable
device. D is a shaft or spindle to which a revolving motion is given in any
convenient way: this shaft passes through and has its bearings in the cutter
stock A and removable piece B, between which in a space left for the purpose is
placed a toothed wheel E firmly mounted on said shaft D and revolving with it.
The rotary cutter F is constructed with teeth f each having a knife edge as
shown more particularly in Fig. 3; these teeth f intermesh with the toothed
wheel E so that as the latter revolves in one direction, the cutter turns in the
other, thus ensuring that the knife edges cannot be injured by so intermeshing, as
it will be seen that the teeth of the wheel E always bear against the reverse side
of the cutting teeth f. The rotary cutter F has hollow, or annularly channelled
sides, as shown in Figs 2 and 4 and the cutter stock A and movable piece B have
eyes or lugs marked respectively a and b preferably made in one therewith, which
fit or are countersunk into the hollow or channeled sides of said rotary cutter F so
as to be flush with or lower than the outer side of said cutter.
In fig 2, is shown a screw of passing through the eyes or lugs a b and cutter F,
but this screw may be omitted as in Fig. 4 since it is not required for the cutter to
rotate upon, but is only inserted in some cases to hold the eye b or outer extremity
of the movable piece B¹ firmly to the cutter stock proper.
It will be seen that the shorter the cutting teeth are made, the larger the eyes
or lugs a bare made, and consequently the distance of the shoulder A' A' of the
cutter stock from the centre of the cutter will be increased, and the cutter will be
thus allowed, when working to penetrate considerably past its centre through the
plate or article operated upon.
In Fig, 3 a brush G is shown, (in dotted lines) for the purpose of cleaning away
shavings from the cutting teeth f, before they intermesh with the toothed wheel E,
but this brush is not always necessary and may be used at discretion.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Henri Adrien Bonneville in the Great Seal Patent Office on the
21st November 1882.
HENRI ADRIEN BONNEVILLE, of the British and Foreign Patent Offices, 8, rue de
la Chaussée d'Antin, Paris France, and 90 Cannon Street in the city of London,
Patent Agent, A CERTAIN NEW AND USEFUL IMPROVEMENT IN ROTARY CUTTERS,
communicated to me by Etienne Salomon, and Edmond Armant, two persons
resident at Montreal, in the district of Montreal and province of Quebec, in the
dominion of Canada,
The invention relates to improvements in that class of rotary cutters which are
used for making slots in metal or other plates, and has for its object to produce a
cutting tool which will go entirely through the plate upon which it is to operate
without offering any obstruction whatever in the shape of a shaft or axis, and one
which will completely finish the slot from one side of the article, and thus avoid
the necessity of filing or otherwise working out the corners.
Heretofore, in cutting tools of this description, it has been absolutely necessary
for the rotary cutter to have a shaft through its centre to serve as an axis for it to
revolve upon, and thus it has been impossible to cut right through the plate
without leaving the corners incomplete, or necessitates a double set of cutters, or
requires the plate or article to be reversed and the operation again performed from
the opposite side.
It will at once be seen that the reason of this is that however small the shaft or
spindle of the rotary cutter may be in proportion to its diameter, said cutter cannot
pass through the material upon which it is operating further than the outer
diameter of its shaft will allow, thus leaving uncut a part of the slot equal to at
least half the diameter of the cutter shaft.
The invention consists broadly in substituting for a shaft as a means for the
cutter to revolve upon, a pair of eyes or lugs projecting from the cutter stock and
countersunk in said rotary cutter so that they may not be more than flush with
the sides of same, and in rotating said cutter by means of a gear wheel intermeshing
with the teeth of said cutter.
For more complete comprehension of the invention however, reference must be
had to the accompanying drawing, in which letters of reference similar to those
used in this specification, indicate like parts.
Fig. 1 is an elevation of a cutter stock arranged with driving shaft to operate
according to the invention; Fig. 2 a transverse sectional elevation of same; Fig. 3
an end view, shewing also in dotted lines, a brush for clearing cutter teeth, and
Fig 4, a sectional detail of a modification of the invention.
A represents any ordinary or suitable cutter stock, but preferably of somewhat
the shape shown, and made with a removable piece B. C is an eye for affixing the
cutter stock to a machine or table; it is obvious however, that different means of
attachment may be used at discretion according to circumstances.
The removable piece B is attached to the cutter stock proper by a screw B¹ or
other suitable device. D is a shaft or spindle to which a revolving motion is given
in any convenient way; this shaft passes through and has its bearings in the
cutter stock A and removable piece B, between which in a space left for the purpose
is placed a toothed wheel E firmly mounted on said shaft D and revolving with it.
The rotary cutter F is constructed with teeth f, each having a knife edge as
shewn more particularly in Fig. 3; these teeth f intermesh with the toothed
wheel E, so that as the latter revolves in one direction, the cutter turns in the

page_text: other, thus ensuring that the knife edges cannot be injured by so intermeshing, as
it will be seen that the teeth of the wheel E always bear against the reverse side
of the cutting teeth f.
The rotary cutter F has hollow or annularly channelled sides as shown in Figs 2
and 4, and the cutter stock A and movable piece B have eyes or lugs marked
respectively a and b preferably made in one therewith, which fit, or are counter-
sunk, into the hollow or channelled sides of said rotary cutter F so as to be flush
with or lower than the outer side of said cutter.
In fig. 2 is shown a screw f passing through the eyes or lugs a, b and cutter F,
but this screw may be omitted as in Fig. 4 since it is not required for the cutter
to rotate upon but is only inserted in some cases to hold the eye 6 or outer
extremity of the movable piece B firmly to the cutter stock proper.
It will be seen that the shorter the cutting teeth are made, the larger I may
make the eyes or lugs a b and consequently the distance of the shoulder A¹ A¹ of
the cutter stock from the centre of the cutter will be increased and the cutter will
be thus allowed, when working to penetrate considerably past its centre through
the plate or article operated upon.
In Fig. 3 a brush G is shown (in dotted lines) for the purpose of cleaning away
shavings from the cutting teeth f before they intermesh with the toothed wheel E,
but this brush is not always necessary and may be used at discretion.
The operation of the invention will be so clearly understood from the foregoing
as to need no further description.
Having thus described the invention and the manner in which the same is to be
carried into effect, I claim and desire to secure by Royal Letters Patent.
:
1st A rotary cutter revolving upon projections from the cutter stock, said
projections being sunk in the sides of the cutter substantially as, and for the
purpose described.
2nd The combination with a rotary cutter having countersunk axes, of a gear
wheel and shaft for rotating same substantially as specified.
3rd The combination with the cutter stock A having removable piece B fastened
thereto by screws B₁ and f¹ and provided with eyes or lugs a b of the rotary
cutter F revolved through toothed wheel E by shaft D, substantially as, and for
the purpose set forth.
4th In combination with the rotary cutter carried and revolved as described,
.the brush G for the purpose specified.
In witness whereof, I, the said Henri Adrien Bonneville, have hereunto set
my hand and seal, this
day of November, in the year of our Lord
One thousand eight hundred and eighty-two.
H. BONNEVILLE (L.S.)