Improvements in Sharpeners for Black and Coloured Pencils..
Year: 1890

page_text: COMPLETE SPECIFICATION.
Improvements in Sharpeners for Black and Coloured Pencils..
I, EWALD BREITSCHEID, of Cologne, in the Province of the Rhine, in the
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 :-
In many or nearly all constructions of pencil sharpeners known heretofore it is a
difficult matter to remove the knife for sharpening it, and to fasten it again, after
having it sharpened. There are constructions which allow no removing of the knife
at all, thus rendering the pencil sharpener perfectly worthless as soon as the knife gets
blunt by use.
In the construction forming the subject of my invention I afford great facility for
removing the knife and putting it in place again, and, moreover, there is no adjust-
ment necessary, as is the case with other pencil sharpeners hitherto made and used.
The knife is secured to the casing by means of screws or the like which necessitate
no adjustment at all, and hold the knife in firm and proper working position throughout
the whole of its length.
I attain these objects by the mechanism illustrated in the accompanying drawing,
in which similar letters denote similar parts throughout the different views, and in
which:
Fig. is a front view of the pencil sharpener.
Fig. 2 is a vertical section, taken on the line 8-9 of Fig. 1.
Fig. 3 is a horizontal section taken on the line 10-11 of Fig. 1, and seen in the
direction 8-9 of Fig. 1.
Fig. 4 is a horizontal section, taken on the line 12-13 of Fig. 2 and seen in the
direction 9-8 of Fig. 1.
Fig. 5 is a front view of the pencil-sharpener, the knife removed and laid aside.
Fig. 6 is a side view seen from the right to the left of Fig. 1.
Fig. 7 is a front view of the device, drawn to a larger scale
The casing a with its conical head is provided with a central conical aperture b,
the latter having at the top a small diameter for letting only pass the lead itself, and
at the bottom a large diameter for allowing the pencil to enter the casing. A
rectangular cuts is provided in the casing said cut exposing a part of the central
aperture one side s of the cut is oblique (Fig. 6) and adapted to receive the
knife n which is secured to the respective side s by means of screws r r. Owing to
the conicalness of the boring, and to the obliquity of the sides of the cut, it is clear,
that the top e of the knife is directed normally to the centre of the lead to be
pointed, and that the bottom e² of the knife is directed tangentially to the cir-
cumference of the pencil, thus producing a perfect tip when pointing a pencil. In
consequence of the breadth of the surface s¹ no vibration of the knife can take place
during the time of pointing; this being of highly favourable influence on the
smoothness of the tip, and on the duration of the knife, the latter keeping its sharpness
considerably longer.
Having now particularly described and ascertained the nature of this inven-
tion, and in what manner the same is to be performed, I declare that what
I claim is :-
In a sharpener for black and coloured pencils: The casing (a) having a conical
horing (b) and a rectangular cut one side of the latter being tangentially to said

page_text: boring, and adapted to receive a knife (m) secured to said side by screws (r) or the
like, substantially as described.
Dated this 10th day of October 1890.
EWALD BREITSCHEID.
By Geo. Thos. Hyde,
4, Moorfields, London, E.C., Agent for the Applicant.