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Патент USA US3099261

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July 30, 1963
Filed May .22, 1961
2 Sheets-Sheet 1
l8 l4
By /% UM
July 30, 1963
File'd May 22, 1961
2 Sheets-Sheet 2 '
Fig. 6
0, M
United States Patent 0 ' ICC
Patented July 30, 1963
which is essentially an improvement in the sharpening de
vice disclosed in US. Patent 2,791,986.
‘More speci?cally with reference to FIGS. 1 and 3, the
(28 Woodside Drive, Pen?eld, N.Y.)
Filed May 22, 1961, Ser. No. 111,710
2 Claims. (Cl. 120-94)
ripheral upturned lip 15, and a cup-shaped housing 16
Clarence R. Taylor, Rochester, N.Y.
This invention relates generally to grinding mechanisms,
and more speci?cally to an automatic motorized sharpen~
ing device for sharpening the end portions of thin and
relatively brittle elongated cylindrical elements such as
drafting leads con?ned within a drafting pencil or com
‘The primary object of the present invention is to pro
vide an improved motorized lead sharpening device that
sharpening device 13 comprises a base 14 having a pe
mounted on base 14 with its outer edge co-operating with
lip 15 to form an enclosure. The edge of housing 16 and
lip 15 may be cemented vtogether to form a completely
sealed enclosure, or if desired, housing 16 may be pro
vided with slots 17 co-operating with screws 18 carried by
‘base 14 for releasably securing housing 16 to base 14. A
rubber pad 19 or similar material may be cemented to
base 14 as best seen in FIG. 3 to minimize the tendency
of sharpening device 13 to move on its supporting surface,
and further to absorb noise and vibrations produced by
is of simple design and construction, thoroughly reliable
device ‘@13.
and efficient in operation, and economical to manufac~
An electric motor 21 of conventional type is mounted
on base 14 and essentially comprises a laminated metal
Another object of this invention is to provide an im
stator 22, a portion of which is encircled by *a coil 23.
proved motor-driven sharpening device for lead or the 20 The motor 21 further has a rotatable rotor 24 having
like which does not produce objectionable noise while in
a shaft 25 at one end provided with an eccentric pin 26
for a purpose to be explained hereinafter. ‘Since this
A further object of the invention is to provide an im
motor 21 and its mountings are substantially identical to
proved sharpening device for lead or the like which re
the motor disclosed in the afore-mentioned patent, and
tains all of the material which is removed from the sharp 25 is explained in detail therein, the structure is referred to
ened ‘object and may be easily emptied.
only generally in this case.
Yet another object of the invention is to provide an im
The housing 16 of sharpening device 13 has a cover 27
proved sharpening device for lead or the like incorporat
as best seen in FIGS. 1, 3, 9 and 10 that is pivotally
ing abrasive members which are inexpensive and readily
mounted about a rod 28 lying in a groove at one end of
Another object of this invention is to provide an im
proved motorized sharpening device for lead or the like
rod 28 being supported in bosses, not shown, in housing
which will provide long, trouble-free service.
‘Still another object of this invention is to provide a mo
torized sharpening device for lead or the like in which
the motor is protected from the ?lings removed from the
sharpened objects.
A more speci?c object of this invention is to provide
cover 27 closed off by a plug 29, the extending ends of
16. The hinged end of cover 27 further has two‘ ?at sur
faces 31, 32 at right angles to one another, one of which
is spaced a further distance from the axis of rod 28 than
the other. A switch 33 for motor 21 comprises a ?rst
leaf spring 34 having one end 35 mounted on the under
side of housing 16, and its other spring end 36 adapted
to selectively co-operate with one of the ?at surface 31, 32
an improved motorized sharpening device for lead or the
for holding cover 27 in its closed or open position respec
like having a unitary reciprocable table resiliently 40 tively, as seen best in FIGS. 9 and 10. An electric wire
mounted and biased by a spring into engagement with a
driving mechanism.
37 interconnects end 36 of leaf spring 34 to motor 21 as
seen best in FIGS. 11 and 12. The switch 33 further
comprises another leaf spring 38 having one end 39 ex
Objects and advantages other than those set forth above
will be apparent from the following description when read
tending through an opening 41 provided by plug 42 co
in connection with the accompanying drawings, in which: 45 operating with spaced apart bosses 43, 44 in housing .16,
FIG. 1 is a perspective view of a sharpening device for
lead or the like in which the present invention is em
and turned through an angle of 180° and secured to the
outer surface of plug 42 as seen in FIG. 9. An insulat
ing strip 45 is interposed between leaf springs 34, 38 to
prevent any shorting therebetween. The opposite end 46
FIG. 2 is an enlarged plan view partly in section of
the sharpening device of FIG. 2 taken along line 2-2;
FIG. 3 is a section view of FIG. 2;
FIG. 4 is a plan view of the table;
FIG. 5 is an end elevation view of the table of FIG. 4;
FIG. 6 is a section view taken along line 6—6 of
of leaf spring 38 is free and substantially parallel to a por
tion of leaf spring 34, and both leaf springs have register
ing contacts ‘47, 48‘. An electric Wire 49 of the normal
type electrically connects end 39 of leaf spring 38 to one
line of a power plug 51. As indicated earlier, one of the
flat surfaces 33 of cover 27 is ‘further removed from the
axis of rod 28 than surface 31 so that in the closed posi
FIG. 7 is a section view taken along line 7-—7 of
tion as seen in FIG. 9, the contacts 47, 48 are separated
FIG. 4;
and motor 21 is unenergized. When cover 17 is opened,
‘FIG. 8 is a segmental section view taken along line
on the other hand, as seen in ‘FIG. 10, the contacts 47, 48
8—8 of FIG. 4;
60 are urged into engagement completing the electrical cir
FIG. 9 is a segmental view of a portion of the sharpen
cuit to motor 21 which is energized, assuming that power
ing device of FIG. 1 showing a novel switch mechanism
plug 51 is inserted in a suitable power supply receptacle.
which is in an open position;
The sharpening device 13 further has a unitary mem
‘FIG. 10 is a view similar to FIG. 9 showing the cover
52 as best seen in FIGS. 4-8 molded from some suit
of the sharpening device in an open position, and the 65
able material such as nylon or the like. The member 52
switch mechanism in a closed position;
FIG. 4;
FIG. 11 is a segmental bottom view of the switch mech
has a substantially rectangular table 53 having overhang
ing lips 54 at one side underneath which an edge of a
anism of FIG. 9; and
rectangular sheet of sandpaper 55 is inserted. The
FIG. 12 shows an electric circuit wiring diagram for
corners of the opposite edge of the sheet of sandpaper 55
70 are bent and inserted in triangularly-shaped slots 56 in
the sharpening device of this invention.
As shown in the drawings, a preferred embodiment of
table 53 for releasably holding the sandpaper on table 53.
a sharpening device 13 for lead or the like is disclosed,
The lips 54- and notches 56 provide an extremely simple
and reliable means for holding a sheet of sandpaper, and
the paper may be mounted on and removed from the table
very quickly and conveniently. The member 52 further
has a. pair of ?exible arms 57, one on each side having
enlarged ends 58 by which member 52 is mounted.
Although two (arms 57 are shown, it is possible that only
one arm, centrally located, would also work satisfactorily.
Each of the enlarged ends 58 of arms 57 has concentric
openings 59, 61 for loosely receiving a pin 62 and upper
rooated by virtue of the connection between slot 28 and
eccentrically mounted pin 26. In order for member 52
to reciprocate, arms 57 must be ?exible and in the pre
ferred embodiment, table 53 has been slotted at 74
adjacent each side to lengthen arms 57, and the slots 74
terminate in a circular opening 75 of a predetermined
radius to reduce the cross-sectional thickness of each
arm 57 at that end and hence increase its ?exibility.
The arms 57 must be ?exible enough so that the load on
end ‘63 respectively of a mounting post 64 ‘as best seen 10 motor 21 is not excessive, and yet it must be strong
enough to be able to Withstand the constant ?exing and
un?exing to which they are subjected. The operator then
sharpens the compass lead on the sandpaper 55 mounted
on reciprocating table 53, wipes the sharpened lead on
Each of the arm ends 53 has a beveled surface or projec
tion 65 inclined several degrees with respect to the hori 15 the wiping pad 71, and then closes cover 27 deenergizing
motor 21. The lead ?lings work their way off the edges
zontal, and an annular boss 66 around which one end of
of table 53 and fall down into the enclosure.
a helical spring 67 is mounted, one end of spring 67
The invention has been described in detail with particu
bearing against beveled surface 65 and its opposite end
lar reference to a preferred embodiment thereof, but it
ibeaning against housing 15. The spring 67 is under slight
in FIG. 3. The posts ‘64 are shown secured to stator 22
by a press ?t or the \like, although any other suitable
means for securing posts ‘64 to stator 22 may be used.
compression and by virtue of surface 65 as seen in FIG. 5 20 will be understood that variations and modi?cations can
be effected Within the spirit and scope of the invention as
tends to apply a ‘force moment to arms 57 urging the
described hereinabove and as de?ned in the appended
arms and table 53 downwardly toward motor shaft 25
and pin 26. The lower surface of table 53 has an elon
gated slot ‘68 for receiving the eccentrically mounted
pin 26, and by virtue of springs ‘67, the eccentric pin 26 25
I claim:
1. In a lead sharpening device for a pencil or the like,
the combination comprising:
and slot ‘68 connection is assured.
The front end of housing 16 further has an integrally
(A) a motor;
(B) a rotatable eccentric pin driven by said motor; and
formed shelf ‘69 as best seen in FIG. 3 for receiving a
(C) a unitary U-shaped member having
sponge 71 or the like by which the lead may be wiped
(1) a pair of spaced apart ?exible arms extending
after it is sharpened. This serves to remove all loose lead 30
in one ‘direction and
?lings that tend to adhere to the lead tip. The shelf
(2) a rectangular table transverse to said arms
further has an opening 72 through which the lead ?lings
and interposed therebetween for releasably
may be emptied from the enclosure after sponge 71 is
holding a piece of sand paper, one end of each
removed for those cases in which housing 16 is sealed
of said arms being integral with one end of said
to base 14.
table and the opposite end of each arm being
To prevent motor 21 from being contaminated by the
pivotally mounted to said device, said table
lead ?lings which accumulate in the enclosure, and which
further having an elongated slot for receiving
may tend to interfere with the proper operation of the
said eccentric whereby said table is reciprocally
motor and hence assure long trouble-free service of
driven along a predetermined path upon rota
sharpening device 13, the motor 21 is enclosed within a
I tion of said eccentric.
plastic membrane 73 as seen in FIG. 3. This is pref
2. The invention according to claim 1 wherein said
erably accomplished by placing membrane 73 around
opposite end of each arm is pivotally mounted on a
the motor 21 and its parts, and then evacuating the air
projection and has a beveled surface, and a spring is
beneath the membrane causing it to tightly encircle
interposed between said device and each of said beveled
motor 21.
srn'faces for holding said opposite end on said projection
In the operation of this invention, let us assume ini
and urging said member into engagement with said
‘daily that the sharpening device 13 is placed within easy
reach of the operator and that electrical plug 51 is inserted
into a suitable receptacle connecting the power supply to 50
References Cited in the ?le of this patent
device 13. Let us assume also that cover 27 is in a closed
position. In this position, switch 33 is open and hence
motor 21 is unenergized, and device 13 is in a normally
Scutt _______________ __ Mar. 30, 1937
inoperative position. Let us assume that the operator,
who may be a draftsman or an architect or the like, has 55
'Iiaylor ______________ __ May 14, 1957
Great Britain _________ __ Jan. 12, 1923
Great Britain _________ __ June 2, 1949
been using a compass and the lead held therein has be
come dulled. The operator then merely moves cover 27
into the open position, automatically closing switch 33
and energizing motor 21 causing member 52 to be recip
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