Improvements in Metal Shearing Machines.
Year: 1898

page_text: Date of Application, 6th Apr., 1898-Accepted, 13th Aug., 1898
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 manually operated metal shearing
machines.
In machines of this type the power which can be exerted by the operator upon
thick pieces of work is limited, and moreover in the shearing of large pieces such
as wide tinplates, it is impossible to correctly observe the marked out lines, handle
the work, and at the same time bring to bear the full strength of the operator
upon the hand lever of the shearing machine.
To overcome these defects is the object of my invention the accompanying
drawings illustrating clearly my improved metal shearing machine.
In the said drawings.
Fig. 1 is a side view of the improved metal shearing machine.
Fig. 2 is a vertical section through the line - Fig. 1 and,
Fig. 3 shows a similar section with the under blade of the machine arranged
vertically.
Fig. 4 is a vertical section through the line y-y Fig. 1.
In my improved metal shearing machine the moveable blade s can be operated
by means of two hand levers h h¹ from the front and the rear of the machine.
To effect this the movable blade s of the shears is secured to a lever a which is
pivotted at o to the frame of the machine. The lever a is formed with a vertical
extension a¹ and a rear horizontal arm a².
The vertical arm a¹ of the lever a is loosely pivotted to a block e which carries
the adjustable hand lever h.
C
The block is also loosely pivotted to a link b mounted loose upon a stud gl
secured to the framing. The rear arm a² is similarly connected to a block c¹
carrying the hand lever h¹, the block e being also pivotted to a link b¹ which is
mounted to turn upon a stud gas shown in Fig. 1. Thus by operating the
levers h h in the direction of the arrows a downward movement of the blade s is
effected against the cutting edge of the fixed blade s¹. By these means therefore
greater power can be exerted than in cases where one hand lever only is used.
When cutting wide pieces the operator standing in front of the machine can
accurately observe the cut whilst operating the hand lever h and the operator at
the rear lever h¹ may then exercise all his available strength upon the lever without
being obliged to watch the work.
When however the cut has been effected, say half way across the work, then
the operator in the rear may superintend the cutting whilst the workman in
front inay in turn exert his full strength upon the lever h.
In order to enable the cut portion of the work to pass through the shears as
straight as possible, so that the traversing of the work as the cutting proceeds is
D

page_text: not hindered through excessive bending of the cut portions, the bearing face of the
lever a is mounted by means of the pivot bolt o upon a bearer or part d which is
conveniently set back from the framing as shown more clearly in Fig. 4.
The bearer d is connected to the bed g of the shears by a horizontal extension d¹.
The upper part of the extension d is disposed a sufficient distance from the
bearing of the blade lever a so as to leave space to permit of the passage of the
upper cut portion of the work in a straight line as shown in Fig. in full lines.
The under side of the projection is rounded so that the lower cut portion t
of the work (shown in dotted lines in Fig. 1) as the cutting proceeds experiences
only a slight bending.
To reverse the fast blade s¹ from the horizontal position shown in Figure 2 to
the vertical position shown in Fig. 3 the framing of the shearing machine is
provided with suitable beds or recesses as shown in the sectional views Figs. 2
and 3.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:-
1. A metal shearing machine in which the movable blade s can be operated
not only from the front but also from the rear of the machine, the blade lever a
being connected on one side to the hand lever h by means of a vertical arm a¹,
block c and link b, and on the other side to the hand lever h¹ by the rear horizontal
arm a², block c¹ and link b¹, in the manner 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 5th day of April 1898
Dated this 5th day of April 1898
For the Applicant,
E. K. DUTTON & Co.,
Chartered Patent Agents, 5, John Dalton Street, Manchester.