Year: 1889

page_text: Implements.
1, BERNHARD NEUMANN trading under the firm of Kühne Sievers and Neumann of
Coeln-on-the-Rhine, Prussia, 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 :-
My invention relates to that class of scissors, shears, tongs, nippers and other
implements, which consist of two blades or halves united by a loose pivot, for which I
have obtained Letters Patent in the United Kingdom, No. 5016 dated April 4th 1887,
and the object of the present improvement applied to my former invention, is to
provide means for regulating or adjusting the degree of pressure between the two
blades or halves of the pair of scissors or of the implement.
According to the afore-said patent, the two blades or halves of the pair of scissors,
etcetera, are united by a loose pivot having a cam which enters into a cam-slot of one
blade and a circular hole of the other blade, said pivot being connected to an elastic
In scissors,
plate, the free end of which was clamped to the shank of one blade.
shears, and similar implements of this kind, the pressure exerted by the elastic plate
of the pivot is uniform, and. the degree of pressure cannot be varied according to the
circumstances of use. Also, the degree of elasticity of the plate is limited, and when
the two faces of the blades, which are working against each other, have been worn
out by repeated grinding and become thinner, the elasticity of the pivot carrying
plate is no longer sufficient to exert the required pressure for holding the blades
tightly against each other and enable them to cut smoothly and exactly.
To repair this inconvenience, I bave provided the said pivot carrying plate with an
adjusting screw which passes through the free end of said plate and bears against the
shank of the blade. On screwing the said screw down, the free end of the pivot-plate
is lifted, and, accordingly, the cam of the pivot at the other end of said plate is
caused to exert a pressure on the lower blade, forcing the same tightly against the
upper blade.
With reference to the accompanying drawings:-
Figure 1 is a plan view of a pair of scissors, the two blades A and B of which are
united by a cam pivot e carried by an elastic plate C, substantially in the manner
described in the Letters Patent No. 5016 of 1887.

page_text: Figure 2 is an underside view of the elastic plate with the pivot c and its cam c
The said plate C, instead of being clamped with its free end to one of the shanks of
the pair of scissors, is conveniently made a little shorter in length, the extent of
length, however, being of no importance for the object to be obtained. Near the free
end of said plate Ca screw e passes through a threaded hole of said plate, and, with
its point, enters into a slight excavation of the upper half of the pair of scissors, as
clearly shown in Figures 3 and 4, both of which Figures are corresponding cross
sections of the middle part of the pair of scissors.
Figure 3 shows the screw e out of use, that is, screwed out so far as to permit the
plate C to rest flatly on the surface of the upper half A. In this position of the screw e,
the cam c¹ of the pivot c will exert no other pressure than afforded by the elasticity
of plate ; the two blades A and B, accordingly, work loosely against each other.
On screwing the screw e down, the free end of plate C will be lifted off the surface of
the half A, as clearly shown in Figure 4. Accordingly, the cam c¹ of pivot c will
exert a pressure towards the upper half A of the pair of scissors and force the lower
half B tightly up against the upper one. Accordingly, the two blades will work
more tightly against each other and cut more determinedly. It will be easily seen
that the degree of pressure may easily be regulated by screwing the screw e more or
less down. When the two halves A and B have, by repeated grinding, become
thinner, the loose pivot c with its cam e' would scarcely hold them tight enough up to
each other without the aid of said screw e; but as the latter provides the means of
xerting a pressure of the lower half B towards the upper half A of the pair of
scissors, the play of the two blades may at any time be regulated by screwing the
screw e farther down. The wearing off of the surfaces by grinding, will not further
impair the smooth and exact cutting of the implement.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what 1
claim is :-
The combination with the two blades or halves of a pair of scissors, shears, tongs,
nippers or other implements of the kind, of a pivot fitting loosely into a hole of the
one blade and entering with a cam into a corresponding slot of the other blade, a
plate secured to said pivot, and a screw passing through a nut near the end of said
plate, said screw serving to lift the free end of the plate and draw the cam-pivot
tightly up by leverage, whereby the pressure of the two blades against each other is
made adjustable, substantially as described.
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