An Improved Metal Shearing Machine.
Year: 1898

page_text: Date of Application, 11th June, 1898-Accepted, 13th Aug., 1898
An Improved Metal Shearing Machine.
I, BRUNO WESSELMANN, of 58, Friedlander Weg, Gottingen, 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 anvention has reference to improvements in metal shearing machines
as 18 well understood.
In metal shears such as have been hitherto employed and in which the shears are
actuated by levers the cutting capacity of the blades diminishes towards the com-
pletion of the stroke owing to the fact that the lever arrangement during the
progress of the cut becomes increasingly unfavourable to the exercise of power.
This invention relates to improvements on and further developments of the
subject matter disclosed in my Specification No. 2440 of 1898 and has for its
object to construct a metal shearing machine with a system of operating levers
by means of which a higher cutting effect is attained by the blades as the stroke
approaches its completion so that greater uniformity of action during the whole
of the cutting operation results
Moreover in using metal shears worked by handlevers, especially such
as are intended for cutting thick plates or bars of metal where a
vigorous stroke is a desideratum, it becomes absolutely necessary that the hand-
lever should be conveniently placed as regards the operator, that 18 to say in
such a position as will allow of his exerting full force on the handlever and yet
permit him to watch and manipulate the work under the shear
To this end I have designed the shearing machine illustrated in the accom-
panying drawings
In the sand drawings
Fig. 1 is & aide view of a large size metal shearing machine having guides for the
movable blade.
Fig. 2 18 a front view of Fig 1
The lever arrangement for actuating the movable shearing blade is as follows.
I provide a hand lever formed with an extension has clearly shown in the
drawing.
This extension h¹ is jointed at f ( being a stud) to a lever f centred on a
stud carried by the framing b The hand lever is also connected through a
link g to a stud 9 passing through the framework of the shears, see Fig. 2
I connect the outer end of the lever f to the knife holder or carrier by one or
more links d so that the knife holder is caused to partake of any movement
imparted to the lever f, the knife holder and shear blades being directed by the
guides a.
By the use of the pivotted lever ƒ and link d the efficiency of the shears is
greatly increased.
Two shear blades mm² may be inserted in the knife holder c either one or the
other of which may be brought into action by simply turning the holder.
In operating, the workman having got his job in position under the shears,
SPR1

page_text: depresses the hand lever in the direction of the arrow bringing the shearing
blade into action at once and the cutting begins
At the commencement of the stroke, the force transmitted is practically the
power obtained by depressing the bellcrank or two armed lever h having its support
at g, but during the progress of the cutting operation and up to its termination,
owing to the gradually changing position of the link y the additional force anising
from the use of an elbow joint comes into play so that an increase of power is
obtained in proportion as the joint 7h 18 straightened out In other words tho
effective force is increased up to the completion of the cut the cutting capacity of
the shears gradually augmenting from the beginning to the end of the operation
The movements of the various levers and links is plainly indicated in Fig 1
by the dotted lines.
By the present arrangement of levers as herein described a suitable and ad-
vantageous position is secured for the workman at the hand lever when exerting
the pressure, the workman can also easily and conveniently place the article to
be operated upon between the shears and keep a careful eye on the cutting line
The salient feature of my invention consists in the interposition of the pivotted
lever f and link d between the elbow joint and the movable shearing blade.
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 -
In a metal shearing machine of the indicated nature, the combination of the
hand lever connected by a link to a fixed stud, with a lever f centred or oscillating
on a fixed stud and a link d operating the movable cutting blade, in the manner
for the purposes and substantially as herein before set forth and as shown in the
drawings
rawing8
Dated this 10th day of June 1898
For the Applicant,
E K DUTTON & Co,
Chartered Patent Agents, 5, John Dalton Street, Manchester.