Improvements in the Construction of Shears, Scissors, Pincers, and the like.
Year: 1893

page_text: Date of Application, 2nd Jan., 1893-Accepted, 4th Mar., 1893
DIL
Improvements in the Construction of Shears, Scissors, Pincers, and
the like.
1 CARL HAMANN of Reinbeck in the Empire of Germany of no occupation
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 an improved construction of shears scissors pincers and
the like, the essential features of which is that the handles are pivoted separately
on the blades or jaws, each handle on each jaw, while the said blades or jaws are-
themselves pivoted together on a pivot common to both; each handle is connected
by means of a link to that blade or jaw to which the other handle is directly-
pivoted.
In this new construction, pressure applied to either of the handles is transferred.
to the sharp edges of the blades or meeting faces of the jaws namely to that blade.
or jaw to which the handle is connected by means of the link and also to that blade.
or jaw on which the handle has its point of support.
In comparison to other known constructions this invention provides that the
pressure applied upon the handles is practically fully utilized while in all cases
where the handles possess only one pivot common to both, a great deal of the
pressure exercised upon the handles is practically lost in this pivot.
This invention is illustrated in the annexed drawing in which Figs. 1 to 4 show
garden shears, Fig. 5 tailors' shears, Figs. 6 to 8 pruning shears and Figs. 9 to 11
pincers, all made according to the improved construction.
Referring to Figs. 1 to 4 G G show the handles pivoted severally on the pins oo¹
on the cutting cheeks or blades A and B which latter are also pivoted together on
the pivot e common to both. The handles G G¹ are connected to the blades B A
respectively the handle G to the blade B and the handle G' to the blade A. by
means of the respective links each of these engaging on a pin 1 on the respec-
tive handle and on a pin 2 on the respective blade.
In pressing down the handle G from its position as shown in dotted lines in
direction of the arrow in Fig. 2, the pressure is transferred from two working
points as immediately evident namely by the link to the blade B and by the pivot o
likewise to the blade A, whereby both blades are pressed together.
Consequently, the pressure exerted is completely transferred to the blades,
which is not the case where the handles possess a pivot in common.
That an important developement of power is effected in comparison to other
constructions may be perceived by the following.
If only the handle & were to be moved (Fig. 2), the link only being displaced,.
the same opening distance (see Fig. 2) would be attained between the blades A
and B as if both handles were moved (see a Fig. 3); the consequence of this is that
for closing the handles, only half the force is required in comparison with other
constructions in which the greatest open distance of the blades depends upon the
use of both handles.
Fig. 5 shows the same construction applied to tailors' shears. In both cases, in
Figs. 1 to 4 as well as in Fig. 5 the pivot in common c of the blades A and B is
below the working points of the links, the consequence of which is a superior cutting
effect since the blades form a more acute angle when in their open position, the
points of support of the handles being between the links and the pivot c of the
blades.
In Figs. 6 to 8 the pivot c of the blades is above the links and below the latter
C

page_text: are the points of support of the handles, in other respects the construction is as
above described.
By Figs. 9 to 11 is represented a pair of pincers in conformity with the inven-
tion, the variation in comparison to the construction of Figs. 1 to 4 being that the
pivoted points are inverted, in consequence of which the closing of the blades is
effected by a pushing of the links so that the links are here in compression while in
Fig. 1 the blades are drawn together by means of the links which are thus in
tension.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is.
Scissors, shears, pincers and the like in which each of the two handles (G G¹)
has a separate pivot or point of support (o o¹) on one of the two blades or
jaws (A B) the latter being pivoted together on a pivot (c) common to both, each
handle being connected by means of a link (1 or 1) to that blade or jaw on which
the other handle is pivoted or supported; whereby pressure exerted upon the
handles is transferred through two working points, by the links (7) and the
pivots (oo) to the blades or jaws (A B) substantially as described.
Dated this 2nd day of January 1893.
R. HADDAN,
18, Buckingham Street, Strand, London, W.C., Agent to Applicant.