Chopping Knives.
Year: 1892

page_text: Date of Application, 4th Oct., 1892-Accepted, 5th Nov., 1892
COMPLETE SPECIFICATION.
Chopping Knives.
We DUNCAN MCLACHLAN, of Groton, in the County of Tompkins State of
New York, United States of America, Gentleman and J. W. ALLEN, of Richford,
in the County of Tioga, State of New York, United States of America, Gentleman
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:
Our invention relates to chopping knives, and our special object is to produce a
multiple radial bladed-chopping knife which shall be self cleaning.
We have found by practice that a multiple bladed chopping knife, in which the
blades are radially mounted in a head, and in which the cutting edges are continuous
and unbroken, or extend in an unbroken line from the outer corner of each blade
to the line of the inner edge thereof, is inoperative because of the clogging of the
material in the angles between the cutting edges and the sides of the blades; and
to avoid this trouble, we cut away the inner lower corners of the inner edges of the
blades, so that, when secured in the head, a central recess is created below the head,
and the inner or meeting ends of the cutting edges are raised and either in a
straight or curved line, rise toward the head from the main cutting edges, thereby
creating a central recess which will prevent the material from clogging between
the vertical faces of the knives.
Our invention consists in the several novel features of construction and operation
hereinafter described and which are specifically set forth in the claims hereunto
annexed.
It is constructed as follows, reference being had to the accompanying drawings,
in which
Fig. 1, is a side elevation of the chopping knife.
Fig. 2, is a transverse section on line x, in Fig. 1.
Fig. 3, is a plan of one of the blades, detached-showing the head in dotted
lines.
Figs. 4 & 5 are views of the blades constructed double, having a central recess
in their cutting edges and provided with slotways to adapt them to be secured
together at an angle to each other.
A, is the shank upon which the handle B is secured, and provided upon its
lower end with a head 1, shown as cone-shaped (but we do not limit ourselves
to that form) in which the inner edges 3 of the blades are secured, as by being
cast into it, or in any other desirable way.
The blades may be constructed double, with a central recess in their cutting edge
and provided with a vertical slotway, or other means, by which they may be secured
together at an angle to each other, the lower cutting edges being substantially in
the same plane.
The lower inner corners of the blades are cut away either angularly, as shown
at 5, or curved and sharpened to create auxiliary cutting edges in extension of the
main cutting edges 4, and the edge 5 rising toward the head create a recess
below the head in which the edges do less cutting than the main edges, and also
present so much less surface to which the material can adhere, that all clogging of
material in the centre of the knife is avoided, the head being also so much farther
removed vertically above the plane of the main cutting edges.
In the drawings we show an odd number of blades, so that no two are in trans-
verse alignment, as this is of especial advantage in sharpening the inner cutting
edges with a file, because it cannot strike upon the cutting edge of another
blade.

page_text: Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is.
1: A blade for a multiple blade chopping knife having a vertical inner edge, a
main cutting edge and an auxiliary cutting edge upon the lower inuer corner cut
away substantially as shown.
2: A multiple bladed chopping knife comprising a shank, a head thereon, and
multiple blades having their vertical inner edges secured therein, and having their
lower inner corners cut away and sharpened, and having cutting edges along their
lower edges exterior to the cut away portion, in combination as set forth.
3: The combination with the head of the blades, having their vertical inner
edges secured therein, and having their lower inner corners cut away to create a
recess below the head, and having their lower edges sharpened, as set forth.
4: A blade for a multiple blade chopping knife, provided with substantially
vertical slotways and a central recess in its lower cutting edges, as set forth.
5: A blade for a multiple blade chopping knife, having an inner, substantially
vertical, edge, a lower cutting edge and having its lower inner corners cut away, as
set forth.
Dated this 4th day of October 1892.
FELL & WILDING,
Agents for the Applicants.