Improvements in Metal Shearing Machines.
Year: 1897

page_text: Date of Application, 28th Sept., 1897—Accepted, 6th Nov., 1897
COMPLETE SPECIFICATION.
Improvements in Metal Shearing Machines.
I BRUNO WESSELMANN of 54 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 invention relates to improvements in metal shearing machines, and has
for its object to facilitate the commencement of the cut and prevent the forward
displacement of the material being operated upon by the shearing blades.
According to my invention I mount the moveable blade to turn upon an
excentric pivot, which pivot is arranged to be turned by means of the hand
lever actuating the upper shearing limb, before the hand lever effects a down-
ward motion of the front end of the said upper shearing limb. By effecting
this partial rotation of the excentric pivot the rear end of the blades is moved
vertically, before the hand lever actuates the blade itself. The shearing is thus
commenced with greater facility and no forward displacement of the work can
take place.
In the accompanying drawings,
Fig. 1 shows a side view of the improved metal shearing machine.
Fig. 2 is a plan view of the same.
formed upon
The method
the rear end
Fig. 3 is a vertical section on the line - Fig. 1.
The upper blade a is mounted to turn upon an excentric pivot
the pivot b and is connected to the hand lever h by the link g.
of giving the upper blade a a vertically downward movement at
first at the commencement of the shearing operation is as follows.
The link g connecting the lever h and blade a together, is formed with a slot i
within which slides the bolt m of the lever h, affording free play for the lever h
when it is brought from the vertical position shown in full lines to the position h¹
shown in dotted lines. The pivot 6 is also connected to the hand lever by
the jointed levers c d, by which means the pivot bis turned on its axis by the
movement of the hand lever from the position h to the position h¹.
The excentric 61 of the pivot b, upon which excentric the blade a turns, being
also turned thereby effects a downward movement of the rear end of the blade a.
As this movement in the direction of the arrow (see Fig. 1) acts almost
vertically on the material to be cut inserted between the stationary blade f and
the upper shearing blade a, the forward displacement of the said material is
prevented. In addition to this, the motion of the blade obtained is most
advantageous for commencing shearing, which by means of the lever mechanism
and the action of the excentric, is effected with greater force than is possible with
direct acting shears.
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:-
1. In metal shearing machines of the indicated nature, mounting the moveable

page_text: blade to turn upon an excentric pivot which is rotated by means of the hand
lever actuating the upper shearing blade before effecting the downward motion
of the front end of the blade, so that the rear end of the blade is moved down-
wards vertically, thereby facilitating the commencement of the cutting operation
and preventing the forward displacement of the material being operated upon, in
the manner, by the means and substantially as described and shown.
2. The general arrangement construction and combination of parts comprising
the improved metal shearing machine substantially as described and illustrated.
Dated this 27th day of September 1897.
For the AAA
E. K. DUTTON & Co.,
5 John Dalton Street, Manchester, Chartered Patent Agents.