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Патент USA US2106963

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1, 1938.
a M, L“ ULLMAN
_
PENCIL SHARPENER
Filed June 12, 1935
.
an’?
‘ 2,106,963
Patented Feb. 1, 1938
'
_
2,106,96ii
UNITED STATES PATENT OFFICE
2,106,963
PENCIL SHARPENER
Morris L. Ullman, Milton, Mass.‘
Application June 12, 1935, Serial No. 26,203
1 Claim. (Cl. 120—93)
This invention relates generally to pencil sharp
ening devices, and particularly to devices of the
character wherein provision is made for effecting
the retention, in and by such devices, of the
5. wood shavings and the ?nely divided graphite
pared from pencils in the use thereof.
The primary object of my invention is to pro
vide a pencil sharpener in the use of which the
wood shavings pared from pencils are compacted,
10 and, by virtue of becomingcornpacted, are ef
fectively retained by the pencil sharpener during
the pencil sharpening operation. The secondary
object of my invention is to provide such a
pencil sharpener from which such compacted
15 masses of wood shavings, together with the ac
cumulations of ?nely divided graphite, can be
discharged in a very simple manner. These and
other objects of my invention, which will readily
occur to those skilled in the art, are realized in
20
the device illustrated in the accompanying draw
ing wherein:
Fig. 1 is a side elevation, partly in detail, of
the pencil sharpener.
~
Fig. 2 is a sectional view of the pencil sharp
25 ener in use, the section being taken along the
line 2, 2 of Fig. 4, showing the manner of accu
mulation of the wood shavings and of the ?nely
divided graphite during the pencil sharpening,
operation.
30
Fig. 3 is a plan view, partly in detail, of the
?tting snugly to the front and sides thereof, and
of a conformation adapted to accomplish pur
poses hereinafter to be set forth: the speci?c
embodiment of the present invention may be
particularly described as follows:
The body l of the pencil sharpener, composed
of any suitable material such as synthetic resins,
is provided with a longitudinally disposed cham
ber forthe reception of the ends of pencils to
be sharpened. This chamber consists of the se 10
quence of the U shapedcylindrical space 2, the
truncated conical space 3, and the truncated
cylindrical space i, extending throughout the
entire length of the body I. A rectangular slot
5 in the top of the body I communicates with 15
this chamber. Inset into the top of. the body 5,
with its edge overlapping one edge of the slot '5,
and held ?xed in position by‘ the screw '3, is the
paring blade 6 whose edge projects slightly into
the U shaped cylindrical space 2 and the trun
cated conical space 3. The cover 8, composed of
sheet metal in the shape shown, having turned
down flanges ‘for sides and front and a top
struck up into a conico-cylindrical surface, is
pivoted upon the body I near its rear end by 2
means of the pivots 9 rotating in cavities of the
body !. The cover, when in position, ?ts snugly
to the front and sides of the body l, thus pro
viding a chamber for the reception of the wood
shavings and ?nely divided graphite pared from
pencil sharpener, showing the arrangement of
pencils during the pencil sharpening operation,
the paring blade in relation to the body of the
and forestalling the escape of any wood shavings
or ?nely divided graphite ‘by way of the front
end or the sides of the pencil sharpener. Par
ticular attention is called to the fact that when
the cover 8 is in position, the rear end Ill of
the conical surface of the cover is positioned
considerably forward of the rear end of the
edge of the paring blade 6.
A device of the character described, occupying
a volume of approximately one cubic inch, and
therefore readily portable, may be manufactured
cheaply and sold at a popular price: despite its
pencil sharpener, and to the pencil receiving
chamber thereof: the lateral cavities in the body
of the pencil sharpener for the reception of the
35
pivots of the cover are also shown.
Fig. 4 is a rear elevation, partly in detail, of
the pencil sharpener, showing the relationship of
the edge of the paring blade to the longitudinally
40 vertical plane‘ of symmetry of the chamber for
the reception of the wood shavings and ?nely
divided graphite pared from pencils during the
pencil sharpening operation, and showing also
the mode of pivoting the cover upon the body of
45 the pencil sharpener.
Fig. 5 is a front elevation of the pencil sharp
ener.
Fig. 6 is a plan view of the pencil sharpener.
Fig, 7 is a side elevation of the pencil sharp
50 ener with the cover rotated to permit the dis
charge of a compacted mass of wood shavings
and an accumulation of ?nely divided graphite.
As shown by these illustrations, the present in
vention comprises broadly a pencil sharpener,
55 provided with a cover pivoted thereupon, and
great simplicity, it is highly satisfactory and ef
fective for all purposes for which it is intended;
and its use is attended with cleanliness to a de
gree attainable only in a costly non-portable
device.
In the use of this pencil sharpener, the novel
advantages of my invention are readily perceived.
As the pencil is rotated in a clockwise manner in
the pencil sharpener, wood shavings and ?nely
divided graphite accumulate in the manner
shown in Fig. 2 at l2 and [3, respectively. The
rate of accumulation of wood shavings at any 55
2
2,106,968
point along the edge of the paring blade 6 is
proportional to the diameter of the conical
plane of symmetry of the chamber is preserved:
thus, for example, if the edge of the paring blade
chamber 4 at that particular point, so that the
rate of accumulation of wood shavings at the
rear extremity II of the paring blade 6 will
always be greater than the rate of accumulation
of wood shavings at points forward of the point
6 is positioned at the mid point of the width of
the body I, shifting of the conico-cylindrical sur
I I.
In actual practice, I have found that, in
the sharpening of a pencil, the amount of wood
10 shavings accumulating in the region forward of
face of the cover is required to reestablish the
proper relationship between the edge of the par
ing blade 6 and the chamber for the reception of
the wood shavings and ?nely divided graphite.
The compacting e?Eect thus realizable by the
construction herein shown and described im 10
the point 10 will just ?ll the space provided, but
the amount of wood shavings accumulating in
parts to my pencil sharpener several novel ad
vantages. First, the wood shavings and ?nely.
the region back of the point III will become packed Y‘ divided graphite produced in the pencil sharpen
tightly in the space provided, as is shown at I2
in Fig. 2. In consequence, the wood shavings
so compacted form a plug which is ?rmly re
tained in position, thus preventing the escape of
any wood shavings or ?nely divided graphite by
way of the rear end of the pencil sharpener, even
ing operation are retained by and in the pencil
sharpener in the simplest possible manner; sec 15
ond, the possibility of escape of Wood shavings
and ?nely divided graphite during the pencil
sharpening operation is eliminated; and, third,
the compacted wood shavings are discharged in
when the pencil sharpener is held vertically.
a more or less integral mass when the pencil 20
The wood shavings so compacted can be dis
lodged .from the chamber by way of the rear
sharpener is emptied.
end only with di?lculty, but the pencil sharpener
can, of course, be emptied very readily by rotat~
25 ing the cover 8 upon its pivots 9 and allowing the
compacted wood shavings and the ?nely divided
graphite to fall from the pencil sharpener. That
this compacting e?ect actually occurs became
apparent to me in the course of experiments
made upon such a pencil sharpener, the cover
of which was pivoted near the front end of the
body I: in these experiments, the accumulating
wood shavings invariably displaced the cover
from the body in a rotational manner. Thus I
35 was lead to realize that. were the cover pivoted
near the rear end of the body I, the compacting
of the wood shavings would cause them to be
retained within the chamber.v . In subsequent ex
periments made upon pencil Sharpeners, the
40 covers of which were pivoted near the rear ends
of their bodies, I found that superior compacting
e?ects could be realized in a clockwise operable
pencil sharpener when the edge of the paring
blade is positioned, as shown, to the left of the
longitudinally vertical plane of symmetry of the
chamber for the reception of the wood shavings
and ?nely divided graphite: in a pencil sharp
ener so constructed, the compacting of the wood
shavings proceeded uniformly throughout the
width of the chamber. Such uniform compacting
e?eot can, of course, be realized in any construc
tion wherein such relationship of the edge of the
paring blade 6 to the longitudinally vertical
While the preferred embodiment of vmy inven
tion has been shown and described, my inven
tion comprises all devices employing the same
principles for the accomplishment of the same 25
or similar results; and the appended claim is
to be construed as broadly as possible in view
of the prior art.
Having thus described ‘my invention, WhatI
claim is:
r
In a pencil sharpener, the combination of a
body provided with a longitudinally disposed
pencil receiving chamber, blade means parallel
to and intrusive into the pencil receiving cham
ber, and a snugly ?tting cover sheathing the 35:.
said body save at its rear end and bottom and
pivoted upon the said body near the mouth of
the pencil receiving chamber, the said cover
forming with the said body a conico-cylindrical
chamber the end of which nearer the mouth of
the pencil receiving chamber is open and the
area of whose vertical cross-section perpendicu
lar to the length of the blade means is substan- -
tially proportional to the corresponding vertical
cross section of the pencil receiving chamber 45
throughout the length of the conical portion of
the said chamber but of lesser proportionality
throughout the cylindrical portion of the said
chamber, and the said cover being rotatably dis
placeable from the top of the said body in a 5,0 :
direction perpendicular to the plane of the top
of the said body.
~
MORRIS L. ULLMAN.
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