Improvements in Shears, Nippers, and the like.
Year: 1892

page_text: Date of Application, 12th Feb., 1892-Accepted, 12th Mar., 1892
COMPLETE SPECIFICATION.
Improvements in Shears, Nippers, and the like.
We, CARL HAMANN, of Reinbeck, of no occupation, and JACOB ALBERT
SCHMIDT, of Barmen, Merchant, both in the Empire of Germany 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 shears nippers and similar tools in which two blades or
jaws are approached to each other by the compression together of the handles, and
the object of the invention is to so cause the movement of the handles to operate
the blades or jaws that a great power or leverage may be attainable in the cutting
or nipping action of the tool. Such improved tools will therefore be especially
suitable for cutting or working hard materials such as metal.
The improvements effect this end by permitting or causing the movement of the
handles towards each other to be greater in proportion to the movement of approach
of the blades, (under which term is hereinafter included the jaws or other operative
faces of the tool whether sharp or otherwise) than is the case with tools in which
the handles are each in one part with the respective blade.
In the accompanying drawings
Fig. 1 is a side view of improved metal cutting shears as shown partly open.
Fig. 2 is an edge view thereof.
Fig. 3 shows the same closed.
Fig. 4 is a detail view of one of the blades.
Figs. 5 and 6 are respectively open and closed aspects of a pair of wire nippers
made according to this invention.
Figs. 7 and 8 are respectively open and closed aspects of another pair of
improved wire nippers of greater strength than those in Figs. 5 and 6.
Fig. 9 is a side view of tailor's shears.
The blades A. B which are pivoted one on the other by a pin or bolt c have
each an extension handlewards of the pivot, m m³, to which extensions the
handles G G are respectively pivoted by bolts 0, 0¹. These handles have each
teeth which mesh with corresponding teeth z' on that blade A or B to which the
respective handle is not pivoted.
3
This construction causes the movement of the handles relatively to the blades to
be greater than would be the case if the handles were solid with the respective
blades.
In Fig. 3 the dotted position of the handle G' is equivalent to the closed position
of the blades if the handle were fixed with the blade in the position in Fig. 1. The
difference indicated by the arc x (Fig. 3) is therefore the gain of movement each
handle acquires by this invention.
In Figs. 5 and 6 rounded teeth are shown instead of the usual shaped teeth in
Fig. 1, in all other and essential respects the construction is the same.
In Figs. 7 and 8, the nippers shown are of greater power since the pitch-radius
of the teeth z is much less than that of the teeth 2¹. This tool will require to be
worked with two hands.
In Fig. 9 the tailor's shears are made on the same
the lower one, has however also a rearward extension
on which the cutting is done, and keeps the shears
base plate for them.
principle, one of the blades,
which rests on the table etc.
upright serving as a stand or

page_text: Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is ;-
Shears nippers (or equivalent hand tools, in which the two corresponding blades,
jaws, or faces are pivoted one on the other and provided with extensions on which
are respectively pivoted handles having tooth gearing each with the blade, jaw, or
face other than that to the extension of which the respective: handle is pivoted.
Dated this 12th day of February 1892.
HERBERT & Co.,
.18, Buckingham Street, Strand, London, W.C., Agents to Applicants.