An Improved Metal Shearing Machine.
Year: 1898

page_text: Date of Application, 31st Jan., 1898-Accepted, 19th Mar., 1898
An Improved Metal Shearing Machine.
I, BRUNO WESSELMANN, of 54, Friedländer Weg, Göttingen, in the Empire of
Germany, 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 and accompanying drawings:
:-
My said invention relates to improvements in metal shearing machines and refers
particularly to means whereby an increased leverage and power can be transmitted
through the hand lever to the moveable blade, whereby thick plates of metal may he
cut with ease and facility.
To effect this I connect a bell crank lever carrying the moveable blade, to the hand
lever by means of an elbow joint or hinged links through which the power exerted
on the handle is transmitted with increased effect to the moveable blade lever. The
hand lever may also be adjustable and removable.
Further my invention relates to an improved method of arranging the fast blade of
the shears relatively to the moveable blade in which the fast blade instead of being
disposed at a right angle as usual is arranged obliquely to the moveable blade.
And in order that my said invention may be more fully understood I will now refer
to the accompanying three sheets of drawings.
On Sheet 1,
Fig. 1 is a side elevation of my improved shearing machine with the hand lever
broken in length for want of space.
Fig. 2 is an end elevation partly in section.
Fig. 3 is a plan, and
Fig. 4 shows a sectional end elevation through the blades of the machine, in which
the fast blade is disposed obliquely to the moveable blade.
On Sheet 2,
Fig. 3 is a side view of a modified form of my improved metal shearing machine.
On Sheet 3,
Fig. 5 shows a side elevation of my improved metal shearing machine provided
with an adjustable hand lever.
In a metal shearing machine constructed in accordance with my invention I secure
the moveable blade s to a bell crank lever a. The limb a¹ of the bell crank lever a
is connected to the operating hand lever h by links or an elbow joint b c disposed in
the rear of the bell-crank lever a as clearly shown in Fig. 1 of the drawings.
By this arrangement a considerable increase of cutting power can be applied to the
blade s as by operating the hand lever h in the direction of the arrow g (Figs. 1
and 5) the elbow joint b c is thrust in the direction of the diagonal line o m the
joint o being thrust inwards so that the links be assume a position indicated by the
dotted lines no p.
The com-
By this movement the limb a¹ of the bell crank lever a is operated in the direction
of the arrow gl so as to bring the movable blade 8 down upon the work.
bined movements of the limb a¹ and links b c are clearly indicated by the arrange-
ment of dotted lines m n o p (Fig. 1). By means of this arrangement the power
applied to the handle is transmitted with increased-effect to the bellcrank lever a. A

page_text: further advantage of my improved metal shearing machine lies in the fact that the
operator can observe the whole of the work, and the setting out lines of the work can
always be readily inspected by him, thus facilitating the execution of the work by the
operator or his assistant.
By this arrangement of leverage the handling of the shears is greatly facilitated
and greater power can be brought to bear upon the work, whilst not offering any
obstruction to the ready removal of the work operated upon.
In Fig. 3 the elbow joint or links b c are shown arranged in front of the limb a¹
of the bell crank lever a. In this case the operator stands in front of the shears to
handle the lever h and is enabled to observe the work in close proximity, and thus
effect the cutting with the greatest exactitude.
In order to reverse at will the position of the links b c from the front to the rear
of the limb a¹ of the bellcrank lever a the frame of the shearing machine can also
be formed or provided with a bolt hole p¹ as shown in dotted lines. The handle h
and links b c can then be brought to the rear of the bellcrank lever a as shown
in Fig. 1.
In order to improve the cutting powers of the shearing machine I may arrange
the fast under blade s obliquely as shown in Fig. 4. By this means the work to be
operated upon lies only upon the cutting edge i of the under blade, so that in cutting,
the cutting edge can penetrate with greater ease into the material t and the partition
of the material is more easily effected by the movable blade s¹.
A further improvement consists in forming the operating lever h¹ (Fig. 5)
adjustable and removable in a conveniently shaped link b instead of forming (as in
Fig. 1) the link b and handle h in one. The advantage of this arrangement lies in
the fact that by slackening the set screw f the handle h may be entirely removed
when the shearing machine is out of action, so as to restrict the space occupied by
the shearing machine.
Moreover by this arrangement the leverage of the handle h¹ may be lengthened or
shortened as required, as when less or greater power is required when cutting thin
or thick material.
For wire cutting the position of the flat under blade may be occupied by an angle
piece w (Fig. 3A) the upright portion of which, formed with holes of various sizes for
the passage of the wire, is disposed against the movable blade s¹ of the shearing
machine.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1) In metal shearing machines, securing the movable blade to one limb of a bell-
crank lever and operating the other limb of the beilerank lever by a suitable handle
or lever through an elbow joint or links b c placed either in front or in the rear of
the bellcrank lever in the manner for the purposes and substantially as described
and illustrated.
2) In metal shearing machines arranging the lower fixed blade obliquely to the
movable blade so as to attain improved cutting power substantially as described with
reference to Fig. 4 of the drawings.
3) The general arrangement construction and combination of parts comprising
the improved metal shearing machine substantially as described and illustrated.
Dat this n0th dow of Januar 1908
Dated this 20th day of January 1908.
For the Applicant,
E. K. DUTTON & Co.,
Chartered Patent Agents, 5, John Dalton Street, Manchester.