SHARPENING SLATE PENCILS, CRAYONS, PLUMBAGO, OR OTHER ANALOGOUS SUBSTANCES
Year: 1884

page_text: WILLIAM SHELBOURNE ICELY Engineer, of 87 Burdett Rd Bow, in the County
of Middlesex do hereby declare the nature of my invention for SHARPENING
SLATE PENCILS, CRAYONS, PLUMBAGO, OR OTHER ANALOGOUS SUBSTANCES to be as
follows:
The Novelty of my Invention consists in Twisting the Cutting blade, or blades,
in their whole length spirally from 1° to 90° by which means the Cutting power of
the Blade is strongest at 1° or, at the thickest part of the Pencil and the power
gradually lessens towards the point at 90° where it merely scrapes, and I am thus
enabled to obtain a point as sharp as an ordinary pin.
When one Blade only is used I secure it to an opening in the side of a Hollow
Cone of wood, or metal-But I prefer to use Four blades, stamped from a Flat
piece of Steel plate in a Die made of a Shape, to give the desired twist to the
Blades and also to Stamp at the same time two projections for a handle to the
Sharpener when the Plate is rolled into a Cylindrical form.
When the Plate is rolled to its Cylindrical form the ends of the cutting blades
form a (+) cross which are soldered together to prevent the Blades separating by
the pressure of the Pencil when being sharpened.

page_text: W SHELBOURNE ICELY of N° 6 Grange Road, Leyton, in the County of Essex-
Engineer (late of) 87 Burdett Road. Bow. London. E. do hereby declare the nature
of my invention for "IMPROVEMENTS IN SHARPENERS" FOR SLATE, AND OTHER
PENCILS, and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
It is composed of one, or more, Steel Blades, twisted spirally in the whole length,
and
from about 1° to 90°, so that the cutting power is Strongest at about 1°,
weakest at 90°, where it merely scrapes.
When one Blade is used for Sharpening pencils; I secure it to an opening in the
side of a piece of wood, or metal, having a conical hole bored within them, and into
which the Blade just penetrates; as represented in the annexed drawings, Plan 1.
Fig 1.; and where a, and b, represent the front, and back ends, respectively.
Plan 2. Fig 2. represents another method, of Sharpening pencils with a Single
Blade, In this plan the Blade is made with a Spring band, c, to grip the peucil
as represented by d, g represents the handle, h, and i, the front and back ends
respectively.
"
Plan 3, Fig 3, represents a "Sharpener" with four Blades, made from a piece of
Sharpener
Steel plate as shewn by j, the projections g g form the handle to the "
when the Plate is rolled into the cylindrical as shewn by Fig 3, k is a small cap,
to keep the ends of the Blades from spreading outwards, by the pressure of the
pencil, when being sharpened, or, instead of a cap, the ends may be soldered
together, l, and m shew the front and back ends respectively.
"
Plan 4, Fig 4 represents a Sharpener" with six cutting edges made from a
Blank as shewn by n, the edges of the pieces x, x, x, are twisted upwards, and the
plate is afterwards rolled into a cylindrical form as represented by Fig 4; o, and p,
represent the front and back ends respectively.
Plan 5, Fig 5, represents a "Sharpener" like the one in Plan 4, except that it is
made from a piece of Tube as shewn by and has eight cutting edges; To form
the Blades the Tube is pressed in a Die Block which give the required Twist to
them, and two saw cuts are then made at right angles to separate, and give the
cutting edges to the Blades; g represents the handle which can be made of any
material; r, and 8, represent the front, and back ends, respectively.
Plan 6, Fig 6 represents a "Sharpener " with four separate Blades inserted in
four oblique saw cuts, in the ring of wood, or metal as shewn at t at the front end
of the Sharpener, and at the back end is a cap u with saw cuts at right angles to
receive the back ends of the Blades; represents the Blade before being twisted;
v and w represent the front and back ends respectively.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is:
1 The twisted Cutting Blade or Blades.
2nd The application of the Twisted Cutting Blade, or Blades for Sharpening
Slate, and other pencils as represented in the Plans 1, 2, 3, 4, 5 and 6.