Improvements in Shears and similar Instruments.
Year: 1892

page_text: COMPLETE SPECIFICATION.
Improvements in Shears and similar Instruments.
I, HERMANN JOEST, of Solingen, in the Province of the Rhine, German Empire,
Manufacturer, 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, reference being had to the accompanying drawings:-
Fig. 1 shows the under blade of my improved shears.
Fig. 2 the pin used for connecting the blades.
Fig. 3 is the upper blade.
Fig. 4 a special spring, which is the main part of my improvements.
Fig. 5 a screw-threaded pin for connecting the said spring with the under blade.
and also for adjusting its tension.
Fig. 6 is a view showing a pair of shears fitted with my improvements.
The object of my invention is to provide simple and effective means for
regulating the pressure with which the blades of the shears or scissors are borne
against each other, and also to construct the instrument in such manner that it may
easily be taken to pieces.
For this purpose I employ a special spring, which is secured in its middle to the
under blade, and which rests with its ends on the upper and under blade
respectively; and I secure the said spring in such manner that its tension may be
regulated according to the resistance offered by the material to be cut.
A is the under blade, provided with a hole B for receiving the central pin C,
and with another threaded hole D, adapted to receive the threaded pin E. The
upper blade A' is provided with the central hole F; the spring G is provided in
its center and at one of its ends with holes H and I respectively.
The parts are put together as follows:
The central pin C is screwed into the hole B of the under blade A, then the
upper blade A' is placed with its hole F over the smooth end of the pin C, where-
after the spring G is placed with the hole I over the protruding end of the central
pin C, and with its central hole over the threaded hole D in the blade A. Finally
the screw-pin E is inserted into the holes H and D and turned until the spring G
presses the blades A. and A' together with the required force. A suitable screw-
key may be attached to the instrument, so that the tension of the spring G may be
adjusted as required.
The operation of the shears or scissors is the usual one, but it will be seen that
the blades A and A' are always held closely together by the pressure of the
spring G. My invention is also especially advantageous on account of the
possibility of regulating the force with which the blades A and A' are borne
against each other, as a very different force may be required when materials of
different hardness or resistance have to be cut. Lastly my invention is very
convenient on account of its simple construction, and the parts being all made of
strong material, there is but very slight liability of the instrument getting out of
order; and should repairs become necessary, the instrument may be taken to pieces
very easily and rapidly, and also put together again in a very short time. The
thorough cleaning of all parts is also greatly facilitated by this construction.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, 1 declare that what I
claim is :-
In shears, scissors and similar instruments: The combination, with the blades A
and A', pivotally connected by the central pin C, of the spring G, adapted to rest
with one of its ends on the under blade “A ond with its athan and an the

page_text: blade A. said spring G being adjustably connected to the under blade A by the
screw-threaded pin E passing through the middle of the spring G, substantially
and for the purpose as described.
Dated this 8th day of April 189
HERMANN JOEST,
By W. H. Munns,
Agent for the Applicant.