Improvements in Scissors for Cutting Leather, Linoleum, and other Analogous Materials.
Year: 1899

page_text: Date of Application, 20th Mar., 1899
Complete Specification Left, 24th Nov., 1899-Accepted, 30th Dec., 1899
PROVISIONAL SIMULTICATION.
Improvements in Scissors for Cutting Leather, Linoleum, and other
Analogous Materials.
I, GEORGES THUILLIER, Manufacturer, of Nogent, Haute-Marne, France, do
hereby declare the nature of this invention to be as follows:-
-
My invention relates to a kind of scissors intended for cutting leather, lino-
leum, and other analogous hard materials which are ordinarily cut with scissors,
shears, knives, blades, etc.
The improved scissors are characterised by the particular conformation of
the blades:
One, which is sharp, is absolutely flat on its inner side and very concave on
its outer side; it has no bevel, that is to say that it cuts in the manner of the
blade of a knife and not like the blade of ordinary scissors. The other blade
instead of presenting a cutting edge presents a relatively wide supporting sur-
face, on which the material to be cut rests, while it is submitted to the action
of the cutting blade: the supporting surface is toothed so as to prevent the
material it is desired to cut slipping during the action of the cutting blade; the
teeth however do not extend as far as the internal edge of the supporting blade,
so that the cutting blade will not be blunted against the teeth.
The teeth of the supporting blade are naturally very fine; these teeth may be
of different forms as for example like the small teeth of a saw; they may be
formed either upon the blade itself or upon a metallic strip attached thereto.
Dated this 20th day of March 1899.
ALLISON BROS.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Scissors for Cutting Leather, Linoleum, and other
Analogous Materials.
I, GEORGES THUILLIER, Manufacturer, of Nogent, Haute-Marne, France, 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:―
It is known that ordinary scissors are but little or not at all suitable for cut-
ting hard, thick materials, such as leather, and strong card-board, linoleum.
sheets of cork, etc. Therefore for cutting these materials, one is often obliged

page_text: to employ edged tools formed in one piece, such as blades, special leather
knives, etc. But the handling of these tools made in one piece is very incon-
venient, and this is the reason why I propose to form scissors susceptible of
cutting leather and other hard and thick materials just as easily as ordinary
scissors cut fabrics, paper, and thin skins. I have succeeded in effecting this
by the combined employment of two blades which are absolutely different from
one another, both in their conformation and in their function, the one being
simply a supporting blade, which only supports and retains the leather during
the cutting, and the other being intended to effect the cut, and consequently
being a very sharp blade. These two blades are made in the following form:
The cutting or edged blade is absolutely flat on its inner side: it has no bevel,
that is to say that it cuts in the manner of the blade of a knife and not like the
blade of ordinary scissors. The other blade instead of presenting a cutting edge,
presents a relatively wide supporting surface on which the material to be cut
rests while it is submitted to the action of the cutting blade; the supporting
surface is toothed so as to prevent the material it is desired to cut slipping
during the action of the cutting blade: the teeth however do not extend prefer-
ably as far as the internal edge of the supporting blade, so that the cutting
blade will not be blunted against the teeth.
The teeth of the supporting blade are naturally very fine; these teeth may
be of different forms as for example like the small teeth of a saw; they may be
formed either upon the blade itself or upon a metallic strip attached thereto.
The accompanying drawings show examples of how the invention may be
carried into effect.
Figs. 1, 2 and 3 are respectively a front elevation, a plan view, and a trans-
verse section drawn to a larger scale than full size, of a pair of scissors for cut-
ting leather constructed according to my invention.
a is the cutting blade, flat on its inner side and concave on the outer side, the
cutting edge of which has no bevel. indicates the non cutting blade which
presents a toothed supporting surface.
So that the cutting blade a does not become blunted against the teeth of the
other blade, a small chamfer h formed on the inner angle of the toothed blade
prevents the points of the teeth from coming into contact with the cutting
edge.
The same result may also be obtained in a very advantageous manner by form-
ing the supporting blade as shown in Figs. 4, 5 and 6. Fig. 4 represents a
transverse section on a considerably enlarged scale of the cutting blade and
a portion of the supporting blade. Figs. 5 and 6 show respectively in plan and
in perspective a portion of the supporting blade.
It will be seen that in this example the top of the blade is slightly inclined
towards the inner surface as at a d; the teeth are formed on the exterior sharp
edge cat an inclination e f, the part f d remaining smooth. The point e of
the teeth is thus higher than the angle and can penetrate into the material to
be cut so as to prevent its slipping.
The part fd instead of being a prolongation of the part ef may be inclined
in the opposite direction, so that the supporting surface is of V section, with
unequal arms, the outer arm being the higher, so that the teeth which are formed
thereon may project and can penetrate into the leather. This construction is
shown in Fig. 7.
Figs. 8 and 9 are similar views to Figs. 4 and 5, which show a modification
of the construction of the supporting blade. In this example the supporting
blade is not cut away, but a small blade g is attached thereto; the teeth of the
latter project slightly beyond the face of the blade so as to penetrate into the
material to be cut for preventing it slipping. It will be seen that in this case,
as in the preceding cases, the inner angle of the non-cutting blade is smooth
and that consequently the cutting blade is not liable to become notched against
the teeth.

page_text: The saw blade or other toothed blade is fixed to the blade 6 by any suitable
means as for example by the aid of rivets, or by the aid of screws, as shown in
the example represented.
Figs. 10 and 11 show that the teeth, instead of being formed on the edge of
the supporting blade b, may also be formed on its exterior surface. It will be
seen that in this case the supporting surface is slightly inclined, so that the
point of the teeth may project and can penetrate into the leather. This arrange-
ment without interfering with the effect of the teeth enables the blade b to be
sharpened by means of a stone, to rectify the wear of the interior angle, which
may be rounded by use.
Fig. 12 shows a supporting blade similar to that shown in Figs. 8 and 9, but
in which the teeth are formed on the blade itself.
In all cases the teeth may be inclined from the side of the angle formed by
the opening of the two blades, as will be understood from Fig. 13. This is the
same even in the case of the teeth cut on the outer surface (see Fig. 14), which
corresponds to the kind of cut of a sickle. It is further evident that the cut
may be finer or coarser, that is to say that the teeth may be closer together or
further apart.
It is known that in ordinary scissors the blades are hollowed out inside,
slightly curved and twisted: this is what is called in the trade the set" (coupe)
of the scissors; this form of the blades has for its object to ensure the perfect
contact of the cutting edges during work. Nevertheless in the case of a thin
blade such as the cutting blade # of my scissors for cutting leather, this form
would have the disadvantage of making the blade twist when it is passed through
the material to be cut, and of throwing it upon the other blade against which
it would become blunted.
In order to avoid this disadvantage, I only give "set" to the supporting
blade and I leave the cutting blade a perfectly flat and straight on its inner
surface (see Figs. 2 and 3).
In the case where the scissors may have to be employed for cutting concave
parts, as occurs for example in the cutting of soles of boots, it will be prefer-
able to curve their blades as shown in Fig. 15. This renders them suitable for
cutting all possible forms; straight parts, concave and convex parts. It is of
course further evident that the curve of the blades may be either to the right
or to the left. Moreover these scissors may be made either wholly or partially
to the left; set to the left. set and rings to the left, for the use of left-
handed people. In one word these special scissors are capable of the same
modifications as ordinary scissors.
"
"
Having now particularly described and ascertained the nature of my said in-
vention, and in what manner the same is to be performed, I declare that what
I claim is:
The scissors for cutting leather and other analogous materials, consisting in
the combination of two blades, one of which, which is the cutter, is thin and
deep, absolutely flat on its inner side, and without any bevel, whilst the other.
which has the "set," presents, not a cutting edge, but a toothed supporting
surface, substantially as specified.
Dated this 94th day of November 1899