Improvements in Machines for Shearing Metal Plates.
Year: 1895

page_text: Improvements in Machines for Shearing Metal Plates.
We, JOSHUA BUOKTON AND COMPANY LIMITED of Well House Foundry in
the City of Leeds, Tool Makers, and JOSEPH HARTLEY WICKSTEED of Well
House Foundry aforesaid, Engineer do hereby declare the nature of this invention
to be as follows.-
Our invention relates to that class of shearing machine wherein metal plates are
cut or sheated between two blades or knives, one fixed and the other caused to slide
past the fixed one Ilitherto such machines have usually consisted of two straight
edged blades usually inclined at an angle to each other so that the cutting operation
began at one end of the blades and was continuously performed backward until the
blades passed each other at the other end. The effect of this method has been to
bend, curve or roll or otherwise warp the portion cut off from the plate operated
upon.
The object of our invention is to cut or shear off strips or portions from metal
plates in such a manner that such strips when severed from the plate shall be flat
or straight or substantially 60.
Our improvements consist in constructing and arranging the blades in the
following manuer.
The fixed blade is so shaped that it presents a concave edge to the moving blade
in such a manner that as the moving blade appronobes the fixed one, a metal plate
inserted between the blades, begins to be sheared first at its two outside edges, the
cuts passing inwards from each end towards the center or apex of the concavity,
until they meet, and the strip is completely severed.
The concavity of the fixed blade may be either a continuous curve or may be
two straight lines inclined towards one another and forming a flat vee or may
be partly curved and partly straight, and may be formed of one or more suitably
shaped pieces or blades.
The moving blade which is forced against and caused to shear off the strip, is
straight, or so slightly curved that it does not bend the stup out of straight, and
the edge of the moving blade when made straight, or the chord of the curvature
of the blade when mado curved, is made substantially parallel to the chord or line
joining the extremities of the curve of the fixed blade.
One of the blades is preferably formed with projections to overlap the other at
the ends so that thereby the width of the cutting aperture is limited; but in order
to meet those cases where it is desired in the same machine not only to cut across or
shear strips from a plate of width not greater than the cutting aperture so formed
as aforesaid, but also to split or shear plates of indblinite length, we attach the
6xed or concave blade to n false seat or bolster, preferably conforming in shape to
the fixed blade, so that both the blade and its bolster can be readily removed from
the machine, and a straight blade in a suitable false seat or bolster, and inclined at
a suitable angle to the moving blade in manner similar to that heretofore practised,
can be substituted in their place
For the purpose of our description we have spoken of the fixed blade as mude
vee shaped or concave, androf the moving blade as having a straight or only slightly
cu ved edge, but we wish it to be understood that it is immaterial to our invention
which blade is fixed or which moving provided always that that portion of the

page_text: plate which 18 required to be straight after severance must be the part projected
under or over, as the case may be, the edge of the straighter blade.
Dated this 4th day of May 1895.
Improvements in Machines for Shearing Metal Plates.
We, JOSHUA BUCKTON AND COMPANY LIMITED of Well House Foundry in
the City of Leeds Tool Makers and JOSEPH HARTLEY WICKSTEED of Well
House Foundry aforesaid Engineer 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
._
Our invention relates to that class of shearing machines wherein metal plates aro
cut or sheared between two blades or knives, one fixed and the other caused to slide
past the fixed one.
Ilitherto such machines have usually consisted of two straight edged blades,
usually inclined at an angle to each other so that the cutting operation began at
one end of the blades and was continuously performed until the blades passed ench
other at the other end.
The effect of this method has been to bend, cuive or roll or otherwise waip the
the portion cut off from the plate operated upon.
The object of our invention is to cut or shear off strips or portions from metal
plates in such a manner that such strips when severed from the plate shall be flat
or straight or substantially so
Our improvements consist in constructing and arranging the blades in the
following manner.
The fixed blade is so shaped that it presents a concave edge to the moving blade
in such a manner that as the moving blade approaches the fixed one, a metal plate
inserted between the blades, begins to be sheated first at its two outside edges, the
cuts passing inwards from each end towards the centre or apex of the concavity
until they meet and the strip is completely severed. The effect of this arrangement
is that the distorting action of the shears takes effect not upon the strip cut off
and which lies against the straighter knife, but upon the main body of the plate
which hes against the hollow knife.
The concavity of the fixed blade may be either a coutinuous curve or may be
two straight lines inclined towards one another and forming a flat vee, or may
he partly curved and partly straight and may be formed of one or more suitably
shaped pieces or blades.
The moving blade which is forced against and caused to shear off the strip, 18
straight or only very slightly curved so that it does not bend the stup out of
straight, and the edge of the moving blade when made straight, or the chord of the
curvature of the said blade when made slightly curved, is made substantially
parallel to the chord or line joining the extremities of the curve of the fixed blade.
The curve if any of the moving blade must always be less than that of the fixed
blade.
One of the blades is preferably formed with projections to overlap the other at
the ends so that thereby the cutting aperture is limited. But in order to meet
those cases where it is desued in the same machine not only to cut across or shear
strips from a plate of width not greater than the cutting aperture so formed as
aforesaid, but also to split or shear plates of indefinite length, we attach the fixed
or concave blade to a false seat or bolster, preferably contorming in shape to the

page_text: fixed blade so that both the blade and its bolster can be readily removed from the
inachine, and a straight blade in a suitable false seat or holster, and inclined at a
suitable angle to the moving blade in manner similar to that heretofore practised,
can be substituted in their place.
For the purpose of our description we have spoken of the fixed blade as made
vec shaped or concave, and of the moving blade as having a straight or only
slightly curved edge, but we wish it to be understood that it is immaterial to our
invention which blade is fixed or which moving provided always that that portion
of the plate which is required to be straight after severance must be the part
projected under or over as the case may be, the edge of the straighter blade
And in order that our invention may be clearly understood we will proceed to
further describe it by reference to the accompanying drawings.
Fig. 1 Sheet 1 is a front elevation aud Fig. 2 Sheet 1 a side elevation of a
portion of a shearing machine constincted according to om improvements.
Figs 3 and 4 Sheet 2 are views of a pair of straight blades of the common form
and Figs. 5 and 6 Sheet 2 are similar views of a pair of blades constructed
according to our invention.
The same letters or figures indicate thoughout the same parts.
A is the moving or upper slide carrying in this case the straight or nearly
straight inclined blade B. C is the fixed jaw of the machine carrying a bolster Ď
which is fitted with a concave blade E, the contour of the concavity in this case
being two straight lines joined by a curve. Projections are formed at the ends of
the blade E so as to overlap the moving blade B. The bolster D with its blade E
may be removed from the jaw C and replaced by a bolster F carrying a straight
blade G such as are shown in Figs. 3 and 4, when it is desired to shear strips of
indefinite length. H are holes foi countersunk bolts for suitably fixing the blades
and bolsters.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed and whilst not confining
ourselves solely to the details of construction shown in the drawings herewith we
declare that what we claim is.
.
(1.) In machines for shearing metals the construction and use of a concave shear
blade in combination with a straight or nearly straight blade suitably inclined
thereto in manner and as and for the purpose hereinbefore described.
(2.) In machines for shearing metals the construction and use of a concave shear
blade in combination with a straight or nearly straight blade suitably inclined
thereto in manner and as and for the purpose herein before described and shown on
the drawings herewith.
Dated this 3rd day of February 1906.
JOSHUA BUCKTON & Co., LD.,
T. A. CARPENTER, Director, for the Company.
J. H. WICKSTEED.