An Improvement in Scissors and Shears.
Year: 1890

page_text: Date of Application, 29th Nov., 1890
Complete Specification Left, 29th Sept., 1891-Accepted, 31st Oct., 1891
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PROVISIONAL SPECIFICATION.
An Improvement in Scissors and Shears.
I, ROBERT WREDEN, Doctor of Medicine and Actual Councillor of State of
31 Great Italian Street, St. Petersburg, Russia, do hereby declare the nature of
this invention to be as follows:-
This invention relates to a construction of scissors or shears in such a manner as
to render them capable of cutting stout fabric, leather or the like, or several
thicknesses thereof, and of having their blades readily taken apart for cleaning or
sharpening.
For this purpose 1 fix by a nut in one of the blades the fulcrum pin which is
free to move in a longitudinal slot in the other blade; and to this other blade
near the fulcrum I fix a stud which projects into an inclined slot of the first
mentioned blade, this slot being nearly at right angles to the other slot when the
blades are opened apart.
As the instrument is worked by hand in the usual way, the fulcra of the blades
move in the slots in such a manner that as the blades close together the hand has
increasing leverage, so that stout fabric, leather or the like, or several thicknesses
thereof can be easily cut. By unscrewing the nut of the fulerum pin, the blades
can be readily taken apart to be cleaned or sharpened.
Dated this 29th day of November 1890.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improvement in Scissors and Shears.
I, ROBERT WREDEN, Doctor of Medicine and Actual Councillor of State of
31 Great Italian Street, St. Petersburg, Russia, 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 arrangement of scissors and shears designed
for the purpose of facilitating the cutting of thick layers or pieces of cloth, leather,
and other similar material.
This is effected by giving to each of the blades (acting as levers of the first
order) a variable fulcrum, which changes its position, when using the instrument,
in such a manner, that the arms of the levers to which the hand power is applied
become lengthened as the blades are closed.
Another feature of this instrument is that it can be easily taken apart so that
the blades can be easily cleaned and sharpened.
Fig. 1 of the accompanying drawings, shews the instrument closed ;
Figure 2 shews it opened, and
Figure 3 is a longitudinal section on the line 1-2 in Figure 1.
с
Each of the two blades a and b is made at the pivot, with a slot c and d, the
slot e in the blade a being parallel to the length of the blade, and the slot d in the
blade being inclined, in such a manner, that when the blades are opened apart as
shewn in Figure 2 the slot d is perpendicular or nearly so to the slot c.
In the slot d slides a pin e projecting from the blade a to which it is rivetted
or otherwise fixed, a cylindrical part of the centre pin is free to move in the slot
a square part of ƒ being fitted in a square hole of the blade b.
C,

page_text: On the one end of the pin
head overlapping the slot c.
The shape and size, as also the constructive details of the blades and handles
may be modified as may be found convenient. For instance, for some purposes, it
might be of advantage to make the cutting edges curved.
is screwed a nut g the other end has a semi-spherical
The action of the part connecting the blades is as follows:-
:-
When the blades are opened apart, as in Figure 2, the pin f occupies the end
of the slot c next the hand; then, as the blades are closed together the pin e
travelling in the slot d causes the blade to slide along the blade a, the pin f being
thus moved along the slot c away from the hand.
Thus the fulcrum of each of the blades, changes its position in such manner that
the arms of the levers to which the hand power is applied gradually become longer,
as the blades close, and thus the scissors or shears are capable of cutting stout
fabrics or leather, or several layers of these.
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:
A pair of scissors or shears, each blade of which has a pin working in a slot of
the other varying their fulcra substantially as and for the purpose herein set forth.
Dated this 29th day of September 1891.
ABEL & IMRAY,
Agents for the Applicant.