Improved Hand Shears for Cutting Tin and Zinc Sheets, Wire-work, and such like.
Year: 1898

page_text: Date of Application, 16th Apr. 1898-Accepted, 20th May, 1898
COMPLETE SPECIFICATION.
Improved Hand Shears for Cutting Tin and Zinc Sheets, Wire-work,
and such like.
I, GUSTAV HAUGK, of 27, Windmuhlenstrasse, Leipzig, German Empire, Merchant,
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 :—
This invention relates to hand shears for cutting tin and zinc sheets, wire-work,
and such like and it has mainly for its object to so make the shears that such
materials can be cut with very little hand pressure.
The improved shears are made with legs which are bent up vertically and
provided at their upper ends with handles. By this vertical arrangement the hand
cannot, when cutting, be injured by coming in contact with the metal. The legs
are connected to the blades in a special manner and so that a very powerful
leverage is obtained, consequently the force required to cut the metal is not so
great as with the present forms of shears.
And in order that my said invention may be properly understood I have hereunto
appended a drawing which shows the improved shears in the open position.
The two legs a of the shears, which form the so called hand levers, are, as is
evident, in a vertical position, and are provided at their lower ends with lateral
extensions b which are pin jointed together at c. The back ends d of the
blades f, f, are pin jointed at e, e¹, to the forward extremities of the legs a. The
blades are also pin jointed to one another at g. The joint constitutes the centre
of movement of the blades.
By this peculiar mode of connecting the legs a with the blades fa parallelogrammic
arrangement of joints g, e, e¹, c, is formed.
If the legs a of the open shears are pressed together the joints e, e¹, move out-
wards and consequently the blades, which turn on the pin g, are brought together;
in this manner the metal is cut.
The force exercised when pressing together the handles h of the legs is naturally
greatly increased when it is communicated to the blades f, owing, first to the action
of the spring i and, second, to the leverage between the legs a and the blades f.
The force communicated to the long lever arms a is transferred through the short
levers b, e, and b, e¹, and the parallelogrammic arrangement of joints c, e, e¹, g,
direct to the blades f.
One of the legs a can have on its inner side a pencil and the other a tape-
measure, or any similar thing, which is a great advantage to the workman, as,
by this contrivance, he is able, at once, to measure the different sheets of tin, etc.,
to be cut.
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
consider novel and desire to claim is :-
Hand shears for the purpose of cutting sheets of tin, etc., having their legs a in

page_text: a vertical position and in which the necessary force required for cutting is com-
municated to the blades f by a parallelogrammic arrangement of joints (c, e, e¹, g),
substantially as set forth.
D
3
C A
1 1000
W. D. FITZPATRICK,
70, Wellington Street, Glasgow, Agent.