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Патент USA US2403235

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July 2, 19.4.6-
l
c. PETERSON
*2,403,235 .
ADJUSTABLE ERASER
_ Filed'Nòv. 15,1944
2 Sheets-Sheet l
` “s
È
Inventor
July 2, 1946»
F. c. PETERSON
'
ADJUSTABLE ERASER
.
Filed Nov. 415, 1944
V2,403,235 i
2 sheets-sheet 2
Inventor
~ By
Patented July 2, 1946
_. 2,403,235
l UNITED , STATES
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PATENT
2,403,235
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OFFICE
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ADJUSTABLE ERASER
A Frank C. Peterson, Randolph, Mass.
Application November 15, 1944, Serial No. 563,533
4 claims.
(Cl. 12o-38),'
2
1
pencil 6, the lowerend of said tube is preferably
This invention relates to an adjustable eraser,
and theA primary object of the invention is to
provide a device of this kind which is compara
internally threaded, as at I0, so that the lower>
end of the tube may be’screwed into thefpencil.y
An eraser I I is longitudinally slidable in the tube
tively simple in construction, durable,- and
efficient in operation.
`
V
' 5, and a cap I2 is rotatable on the upper end of
'
the tube and is provided With‘tangentialgear
More specifically, the presentrinvention con
templates the provision lof an adjustable eraser
teeth I3> which, as shown in Figures 1 to 4 in
clusive, are formed on the upper surface of an
including a'tube that may be’secured on the
upper end of a pencil, an eraser longitudinally
inwardly _projecting flange I8 provided on the
slidable'in the tube, a :cap rotatable on the upper
end of the tube andprovided with gear teeth,
said cap having a central opening through which
inner or lower endv of cap I2.` 'I'he cap I2.. has a
the eraserprojects, feed rollers journaled in and
arranged transversely of the tube at the upper`
end of the latter and respectively engaging oppo 15
site sides of the eraser, and means operatively
connecting said feed rollers with the gear teeth,
whereby turning of the cap will effect longitu
dinal adjustment of the eraser.
The exact nature of the present invention will v20
be readily understood from the following descrip
tion when considered in connection with the ac
tube at the upper end of the latter. The rollers
I5 respectively engage opposite sides of the
eraser. In Figures l to 4, the rollers have shafts
companying drawings.
of the cap I2, so that the eraser may be posi
tioned to have the desired amount or portion
' In the drawings, whereinlike reference char.
central opening Il'through which the eraser
projects, and feed rollers I5 are journaledin the..
I6, respectively at opposite ends thereof, which
project into the cap I2. Pinions I1 are secured
on the shafts I6 and mesh with the gear teeth
I3, whereby turning of the cap I2 will eifect
longitudinal adjustment of the eraser. Obvious
ly, the eraser may be adjusted outwardly or in
wardly, depending upon the direction of rotation
acters indicate corresponding parts throughout 25 thereof projecting outwardly -beyond the cap.
the several views:
Figure 1 is an elevational View of a pencil
equipped with an adjustable eraser attachment
»constructed in accordance with the present in
vention.
Y
The teeth of the pinions I1 are formed to prop
erly mesh with the tangential gear teeth I3.
It '
will be seen that the cap I2 is retained in place
upon the upper end of the tube 5 by engagement
30 of the flange I8, which carries the gear teeth I3,
Figure 2 is an enlarged central longitudinal
sectional view of the attachment shown in Fig
beneath the pinions I1. A very simple and dur
able attachment is thus provided which is ef
ure l.
ficient in operation, easy to use and economical >
to manufacture.
Figure 3 is an enlarged transverse section
In the embodiment of Figures 5 to 8, inclusive,
35
taken on line 3-3 of Figure 2.
the rollers I5’ are in the form of worm pinions
Figure 4 is an enlarged end elevation looking
disposed to project through slots provided in
to the left of Figure 2.
opposite sides of tube 5’. The rollers I 5’ are
Figure 5 is a view similar to Figure 1 of a
geared to the cap for rotation thereby in that
modified form of the invention.
Figure 6 is a view similar to Figure 2 of the 40 they directly mesh with internal worm gear
attachment shown in Figure 5.
threads I 3’ provided on cap I2’. In this form,
Figure 'l is a section of the plane of line ‘I-'I
the cap I2’ is retained in place by spinning the
of Figure 6, with the cap and eraser omitted.
flange I8', which is provided on the lower end
Figure 8 is a View similar to Figure 4 of the
of cap I2', inwardly into an annular Vexternal
45 groove I9 provided in the tube 5’. Rotation of
device shown in Figure 5.
' Figure 9 is a view, similar to Figure 2, of a fur
cap I2' in ‘this form causes rotation of rollers
ther modification.
I5' so that the latter adjust the eraser inwardly
Referring in detail to the drawings, the present
or outwardly, depending upon the direction in
attachment includes a tube 5 that may be
"
adapted to be secured on the upper end of a 50 which cap I2' is rotated.
In the modification of Figure 9, the cap I2a is
pencil 6 and that is preferably divided into a
retained in place by spinning the flange I8a into
loWer Kpencil end-receiving chamber 'I and an
groove
lila, but the pinions I'Ia are secured on
upper eraser-receiving chamber 8 by means of a
shafts Ilia within tube 5a and mesh with gear
transverse partition 9. While any suitable means
may be employed to secure the tube 5 on the 55 teeth I3`<L of a cylindrical flange rigid with the
2,403,235
3
4
‘ top of cap I2a and projecting into tube 5a out
*wardly of rollers l5a.
The invention is simple, compact and efficient,
of the eraser, said cap having a flange disposed
beneath the pinions to retain the cap on the tube.
1and all forms operate in substantially the same
3.- An adjustable eraser attachment for pen
cils, comprising a tube adapted to be secured on
‘ manner.
What I claim as new is:
,.
and meshing `>with the gear teeth, whereby turn
ing of the cap will effect longitudinal adjustment
Y
1. An adjustable eraser attachment for pencils,
the upper end of a pencil, an eraser longitudinally
comprising a tube adapted to be secured on the '
slidable in the tube, a cap rotatable on the upper
upper end of a pencil, an eraser longitudinally
end of the tube and provided with gear teeth,
3 slidable in the tube, a cap rotatable on the upper 10 said cap, having ay central opening through which '
end of the tube and provided with gear teeth, said
cap having a central opening through which the
eraser projects, feed rollers journaled in and ar
îranged transversely of the tube at the upper end
îof the latter and respectively engaging opposite
`sides of the eraser, said feed rollersrhaving shafts
respectively at opposite ends thereof projecting
linto the cap, and pinions secured on said shafts
and meshing with the gear teeth, whereby turn-'
§ing of the cap Will effect longitudinal adjustment
î of the eraser.
-2. An adjustable eraser attachment for pen#
the eraser projects, feed rollers journaled in and ,
arranged transversely of the tube at the upper
end of the latter and respectively engaging op- '
posite sides of the eraser, said feed rollers hav
ing shafts respectively at opposite ends thereof
projecting into the cap, and pinions secured on
said shafts and meshing with the gear teeth,
whereby turning of the cap will effect longitudi- '
nal adjustment of the eraser, an inwardly pro
20 jecting annular flange on the inner end of the
cap, said ñange having said gear teeth on the
1:5
upper surface thereof..
-
A
cils, comprising a tube adapted to be secured on
4. An- adjustable eraser, comprising a tube, an
`theupper end of a pencil, an eraser longitudinally
eraser longitudinally slídable in the tube, acap
slidable in the tube,l a cap rotatable on the upper 25 rotatably secured ’on the upper end of the tube
`end of the tube and provided with gear teeth, said
and havinga central opening through Which the
cap having a central opening through which the
eraser projects, rotatable feed rollers carried by
eraser projects,feed rollers journaled in and ar
the tube, and respectively engaging opposite sides
;ranged transversely of the tube at the upper end
of the eraser, and means gearing the feed rollers
,of the latter and respectively` engaging opposite 30 to the cap, whereby turning of the cap will cause
‘sides of the eraser, saidy feed rollers having shafts ,- rotation of the feed rollers for longitudinally ad
‘respectively 'atl opposite ends thereof projecting
:into the cap, and pinions secured on said vshafts
. justing the eraser.
FRANK C. PETERSON.
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