Improvements relating to Pencil-sharpeners.
Year: 1891

page_text: Date of Application, 10th Aug., 1891
Complete Specification Left, 10th May, 1892-Accepted, 11th June, 1892
PROVISIONAL SPECIFICATION.
Improvements relating to Pencil-sharpeners.
I, JOHANN DIETRICH BRUNS of Ruhla, Thuringia, Germany, Merchant, do
hereby declare the nature of this invention to be as follows:-
—
My invention relates to improvements in pencil-sharpeners; and the object of
the same is to afford facilities for fastening the knife to the conical socket in such
a manner that it may be easily adjusted in accordance with the thickness of the
pencil and the desired form of the point required as well as to replace or turn the
knife into a position, in which the cutting edge may be ground or sharpened, without
taking the knife off the rest of the conical socket guiding the point of the pencil
to be sharpened.
In carrying my invention into effect, I provide a conical socket which serves to
guide the point of the pencil to be sharpened with a flat rest for the knife in which
rest is formed a slot parallel to the outlet-passage in the surface of the conical
socket, for the chips of the pencil to pass. Through this slot 1 pass a bolt the
head of which bears upon the outer face of the knife, while the other end of the
bolt forms a fulcrum or pivot for a clamping lever, which lever is prevented from
leaving the bolt by a shoulder or nut, Between the clamping lever and the reverse
side of the knife rest, I insert a washer, on the under side of which is formed a
projection the surface of which has an incline or screw-thread of about half the
arc of a circle surrounding the pivot or fulcrum of the clamping lever. Upon this
incline or screw thread, bears a nose or suitable extension of the clamping lever in
such a manner that the knife is rigidly pressed upon its rest at a certain position of
the clamping lever, while on turning the same backward, the knife is released and
can be adjusted, or turned about the said bolt, so that the cutting edge which
extended into the outlet passage of the conical socket when the knife is in use will
occupy the opposite position in which it may be easily ground or sharpened.
Instead of providing the said washer beneath the clamping lever with an incline
or screw thread the latter may be made in the form of a bifurcated eccentric
pivoted to the aforesaid bolt, which serves to press the knife upon its rest.
The knife may also be provided with a slot transversally arranged to that formed
in its rest for the passage of the bolt in order to admit the cutting edge of the
knife to approach to or recede from the centre of the conical socket of the pencil
sharpener.
PHILLIPS & LEIGH,
22, Southampton Buildings, Chancery Lane, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements relating to Pencil-sharpeners.
I, JOHANN DIETRICH BRUNS, of Ruhla, Thuringia, Germany, 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 :-
My invention relates to improvements in pencil-sharpeners, and the object of the
same is to afford facilities for fastening the knife to the conical socket in such a
manner that it may be easily adjusted in accordance with the desired form of the
point of the pencil, as well as replaced, or turned, into a position in which the
cutting edge can be ground without taking the knife off the conical socket.

page_text: I attain this object by the mechanism illustrated in the accompanying drawings
in which
Fig. 1 is a side elevation and Fig. 2 a plan of my improved pencil-sharpener,
while Figs. 3 and 4 show a detail of the, mechanism from two different points of
view. In Fig. 5 is shown a side elevation, in Fig. 6 a cross section of a modification,
of which Figs. 7 and 8 illustrate a detail, while Figs. 9 to 11 represent the knife in
different positions in regard to the conical socket of the pencil sharpener.
Similar letters refer to similar parts throughout the several views.
C
a is the conical socket, which serves to guide the point of the pencil. This
socket is provided with a flat rest à' for the knife c in which is arranged a slot a²,
parallel to the outlet passage a³, for the chips of the pencils in the surface of the
said conical socket a. Through this slot a² is passed a bolt b, the head of which
bears directly, or through the medium of a washer, upon the outer face of the
knife while a shoulder of the other end of the bolt bengages over the eye of
a clamping lever d. Between the latter and the reverse side of the said rest of
the knife c, is inserted a washere and that face of the latter which is directed
towards the eye of the said clamping-lever is designed to form an incline or screw-
thread e, of about half the are of a circle, surrounding the said eye. Upon this
incline or screw-thread e bears a suitable extension or nose d' of the clamping-
leverd in such a manner, that the knife is rigidly pressed upon its rest a¹ at a
certain position (that indicated by I Fig. 2) of the clamping-leverd while on
turning the same backward into the position I (Fig. 2), the knife may be adjusted
or turned about the said bolt, so that the cutting-edge, which extends into the
.socket, when the sharpener is in use (Figs. 9 and 10), will occupy the opposite
position Fig. 11, in which it may be easily ground.
The knife may also be provided with a slot (see Figs. 9-11) arranged trans-
versally to that a² of its rest a' for the passage of the bolt, in order to allow the
cutting-edge of the knife to be moved to or from the centre of the socket of the
pencil-sharpener.
In the modification shown in Figs. 5 to 8 the bolt is provided with a pin
(instead of a shoulder ¹) serving as a pivot for the bifurcated clamping-lever D.
The hub of this lever D forms an eccentric D' in such a manner, that in the
position 1, Fig. 5, bolt and the knifee may be moved at will, while in the
position II, Fig. 5, the knife e is rigidly clamped upon the rest a¹ of the socket a.
Having now particularly described and ascertained the nature of my inven-
tion, and in what manner the same is to be performed I declare that what 1
claim is :-
:-
1. In a pencil-sharpener, the combination of the slotted knife rest a, the knife C,
the bolt b, washer e provided with an incline e', and the lever d, substantially as and
for the purpose set forth.
2. In a pencil-sharpener, the combination of the slotted knife rest a, the knife c,
the bolt and the eccentric clamping lever D pivoted to the bolt b, substantially as
and for the purpose set forth.
3. In pencil sharpeners the combination with the body of the sharpener and the
knife of a device for adjusting the latter as and for the purpose set forth.
Dated this 10th day of May 1892.
PHILLIPS & LEIGH.
No. 22, Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicant.