A Knife Guide for use in Sharpening Pencils and the like, also applicable as a Point Protector.
Year: 1899

page_text: Date of Application, 18th Oct., 1899
Complete Specification Left, 6th Mar., 1909-Accepted, 18th Oct., 1900
Complete Specification Left, 6th Mar., 1900-Accepted, 18th Oct., 1900
TRUVIDIVAAL SPECIFICATION.
A Knife Guide for use in Sharpening Pencils and the like, also
applicable as a Point Protector.
I. ERNEST RUDOLPH SIEGENTHALER, of 67, Victoria Street, in the City of
Bradford, Short Hand Writer and Foreign Correspondent, do hereby declare
the nature of this invention to be as follows:-
I may simply employ a conical knife guide to fit over the end of the pencil to
be sharpened and having a slit or opening along the side the sides of which
opening are shaped or made to form a guide for a knife to be used by hand to
sharpen the pencil. Two or more of said openings may be made in the guide.
A split or other suitable tube may be secured to the guide to form a pencil
point protector.
Dated this 17th day of October 1899.
:
DRACUP & NOWELL,
Patent Agents,
Bradford,
A Knife Guide for use in Sharpening Pencils and the like, also
applicable as a Point Protector.
I, ERNEST RUDOLPH SIEGENTHALER of 38, Islington Row, Five Ways, Birming-
ham late of" 67, Victoria Street, Bradford, Yorks, Shorthand "Writer and
Foreign Correspondent, 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:-
-
The nature of my said invention consists in a new principle of sharpening
pencils and the like, and to carry same into effect I employ a blank of sheetsteel
of suitable 'shape as shown on the annexed drawings by Fig. 4.
I then proceed by means of the special tools, to roll press and form said blank
into a bottle like shaped form one half of which appearing in a cylindrical
tube or barrel which may be suitably pierced to form springs to clamp the
pencil whilst the other half is conically tapered into a narrowness or neck of
in diameter on the inside of tube to receive and clamp the wood of the pencil
immediately after the lead passed through the narrowness or neck. I then give
the tube a parallel shape to prevent any part of the lead from touching the tube
as shown by Fig. 2 and 3 on annexed drawing. I then end the guide by means
of a hook (a).
The sides of the conical part of blank, being kept from 16 to 2 of an
inch from one another I thus obtain an aperture or opening throughout the length
[Pine S17

page_text: of conical part the sides of which aperture or opening being the edges of conical
part of blank which after being filed down on a hardened spit previously inserted
into the tube and which spit being pencil shaped I thus obtain two narrow
smooth surfaces (c) forming a guide for a knife to be used by hand to sharpen
the pencil. I then proceed to bend the far end of formed blank into a hook
like form Fig. 2. (a).
I then obtain a slot for the blade to enter or catch thus enabling me enable me
to turn the pencil round leaving the knifeguide stationary.
Fig. represents a tongue of sheetsteel punched out of the blank and bent
round so as to face pencil point at right angle thus acting as a stop to prevent
the pencil from entering too far into the tube.
The annexed drawing illustrates the above described knife guide in 4 views.
Fig. 1 showing the elevation
Fig. 2 the cross section and
Fig. 3 the longitudinal section whilst Fig. 4 represents the blank consisting of
suitable sheetsteel which may be suitably pierced to facilitate its manufacture.
The blank having now passed through the process of rolling, pressing and
forming it is then hardened and tempered which process will then prevent the
knifeblade from losing its acute edge, and further give the hook (a) and the
tongues (e) the necessary hardness and spring power.
The use of above described knife guide thus entirely disposes of the commonly
complained of breaking of the point incidental to sharpening same, whilst it
may be replaced on to the pencil when the latter has been used, when it will
act as a pencil point protector.
To use the here described knife guide I proceed as follows.
I take the knife into the right hand holding the pencil partly by the wood
and partly by the barrel with the fingers of the left hand I then butt the pencil
point respectively the hook of knife guide («) against my right thumb and
proceed to cut the pencil as in the usual manner by gliding the knife from the
beginning of the hard guide (e) down into the hook thus cutting off the wood
or lead that may be protruding through the aperture. Before withdrawing
the knife blade from hook (a) I turn the pencil slightly round with two fingers
of the left hand and gently pressing the pencil against my thumb I then with-
draw the knife blade from hook (a) to repeat the cut from the very top down
into. the hook cutting and turning the pencil round until the point touches the
stop when the pencil will be perfectly sharp.
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. A conical knife guide combined with a hook (a) and springs (e).
2. A hook forming part of the knife guide for the blade to enter or catch to
render the guide immovable sideways while revolving the pencil to repeat the cut.
8. The conical part of a knife guide so shaped as to form a narrowness or
collar. to receive and clamp the pencil, allowing such portion of the wood and
the whole of the lead as is situate between said narrowness or collar and the
hook, to revolve in space and in no way to touch the guide.
4. A knife guide, embodying the peculiar shape as set forth in Claim 3 in
combination with a number of springs suitably shaped to take and clutch any
size pencil in the centre of the springs to secure the rotation of the pencil on its
own axis, in order to obtain the point in the centre of the lead.
Dated this 5th day of March 1900.
ERNEST RUDOLPH SIEGENTHALER.