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Sept. 27, '1949.
n
H. R. JocHlM
2,482,852
S‘CREW FEED MECHANICAL> PENCIL WITH FRICTION BRAKE
Filed May s1, w45
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2 shèe‘xœsheet 1
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Sept. 27, 1949.
H. R. JQcHlM
' '
2,482,852
SCREW FEED MECHANICAL PENCIL WITH FRIGTION BRAKE
Filed May 5l, 1945
2 Sheets-Sheet 2
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Patented Sept. 27, 1949
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2,482,852
UNITED STATES PATENT OFFICE i
FRICTION BRAKE ,
'
Helmet R. Jochim, Downers Grove, IIL, assignor
to Rite-Rite Manufacturing Company, Downers
Grove, Ill.
Application May 31, 194.5,`
;
11 Claims.
Serial No'. 596,823
(Cl. 120--18)
2
'f
tube is flanged at its rear end as indicated at I9
so that it may project outwardly at one end of
This invention relates to improvements in me
chanical pencils >or the like.
"
-
- - One of the objects of the invention is to pro
~ the barrel.
movement in the barrel. A guide tip 22, bored
‘to freely receive the plunger 23, is provided with a
reduced tubular end portion 24 having a press ñt
at 25 with the forward end portion of the chan
nel tube. The lead which is activated by the
plunger is marked 26.
Arranged within the channel tube is a spiral
member 21 preferably made from metallic rib
bon and forming a spiral slot 28 which cooperates
with a projection 29 extending lat-erally from the
-inner end ofthe plunger 23 and into the slot I1
‘of the channel tube. It will be obvious that if
:Another object of the invention is to furnish
a mechanical pencil in which the parts are so
1 constructed that they can be assembled by hand
and be locked in an assembled relation without
theuse v'of rolling mechanism, crimping mecha
ïnism or the like.
v '
_With the foregoing` objects outlined and with
ïother' objects in ‘View which will appear as the
vdescription proceeds, the invention consists in the
lnovel features hereinafter described in detail,
illustrated in th-e accompanying drawings, and
more particularly pointed out in the appended
claims.
'
-
'l
the spiral memloer'is- turned about its longitudi
'
i' 5 In .the drawings:y
f
>nal axis 'while' the channel tube is stationary,
the projection 29 will be moved lengthwise of
»
fvF-ig. 1 is an enlarged longitudinal sectional View,
partly in elevation, of the front end portion of a
'i the barrel I4 to propel or Withdraw the lead, de
pending on the direction of rotation.
mechanical pencil` of .the type improved by the
îpresent invention.
'
Jtion and illustrating an- example of the improve
»
.
-
" Fig.13 is a plan view of the channel tube of the
pencil..VV
`
'»
'
ï
Fig. 4 is a similar view ofthe n tube ' but ' taken
at Yright angles to Fig. 3. . ` 1
>
~
Fig. 5 is .an end view of the same.
.
-entrant annular flange 3|, embracing and se
cured to the spiral member, by? solder or the like.
30 'The ferrule is preferably formed of resilient sheet
metal and its -outer rim, before the parts are as
sembled, is flared, as shown vin Fig. 6. Therefore, f
,
when> an eraser or second ferrule V32 is placed
Aabout the ferrule 30, there will be a pressV fit at
Fig. 6 is a side elevation partly in diametrical
section of the spiral assembly.
'
t . Fig. 7 is a diametrical sectional .view of the
>lock cup.`
`33 between these parts so that turningY of the
reraser ferrule will effect turning of the driving
'
Fig. 8 is an elevation of the same.r
Vferrule in the spiral member.
»
springwasher.
r
~
‘
' Fig. 11 is >a side elevation of the eraser ferrule.
Fig. 12 is an end view of the same.
.
Fig. 13 is a View similar to Fig. 2 but illustrat
'ing a modification.
_
,
. ‘ Referring ñrst to Figs. 1 and 2, I4 designates
'a barrel provided with a bore I5 for the reception
Vof the channel tube I6. As best shown in Figs.
3 to 5, inclusive, this tube may be made of »rolled
vsheet metal and is provided with a straight longi
tudinal channel or guideway- I1 at one side which
is in -alignment with a protuberance I8 project
-ing from-.the diametrically opposite side. The
Vprotuberance may cooperate with'a groove (not
shown) fin the bore of .the barrel to prevent rota.
-
It will be noted from-Fig. 2 that the driving
>ferrule slidably engagesone face of the flange'IS
VFig. 9 is a diametrical sectional view ofthe
- . Fig. 10 is an elevation of the washer. >
'
For turning purposes, a driving ferrule 30 is
secured to the rear end of the spiral member in
Vany- suitabl-e way. The driving ferrule may con
sist of a sheet metal cup provided with a re
'
1; i, Fig. 2 is a similar View of the `rear end por- .
lments.
Referring to Fig. 1, an externally
corrugated ring 2l! may be secured by a press fit
as at 2| to the opposite end of the channel tube
for the purpose of securing the tube against axial
“vide a rmechanical pencil having means to resist
ïïthe propelling of the lead, i. e., unintentional
lengthwise movement of the lead.
40
of the 'channel tube-While the opposite face of
the flange engages a Vspring washer 34, preferably
‘of dish-'shape and having ra plane annular sur
face 35 at its rim portion, engaging the bottom
36 of a lock cup 31, formed of spring metal.
From Fig. 7 it will be noted that the wall of
the lock cup, before the parts are assembled, 4is
ilared, and in assembly is turned in a direction
»opposite to that of the rim of the driving ferrule
36, and therefore when the eraser ferrule is placed
50 .in position, there will be a press ñt 38 between
the lock cup and the eraser ferrule which will
cause the former to turn with the eraser ferrule
when it is desired to project or withdraw the
lead.
l
-tion -of the'tube about its'longitudinal axis. AThe 55 . kIt may. also be seen from Fig; l2 that the eraser
2,482,852
3
4
ferrule is long enough to receive an eraser 40 at
its rear end, and to sleeve over the rear end por
by very tight friction, by which the Whole oper
tion of the barrel, at its forward end, so that an
ornamental bead 4l at the forward end of the
Heretofore, various means for locking the parts
together have been proposed. Frequently, a roll
ing method was used wherein some of the metal of
the eraser ferrule was turned into a groove in the
barrel but this prevented». any removal of the
ferrule may abut against an annular shoulder 42
at the exterior of the barrel. Due to this con
struction, it is unnecessary to» secure the eraser
ferrule toY the barrel by rolling a portion of the
ferrule into an annular groove or the like, of the
barrel.
Instead of making the lock cup 31 in one piece, Y
two parts may be used as illustrated in Fig; lf3,
in which case the annular rim 31a of the cup- is
made separate from the bottom 31h, whiehf mayy
be in the form of a simple washer'.
From the foregoing, it is believed that the con
struction, operation and advantages of the inven
tion may be readily understood, but with refer
ence to the novel features of the improvectconf
struction, the following may be said.
- The chief purpose of the spring washer 34 is» to
- provide or set up. a su-itable resistance against the
turning of the spiral. member 21. In all me
chanical pencils it is essential that the lead be
held rigidly sor that pressure on the lead during
Writing will not activate the mechanism and
thereby' cause undesired backward. or forward
movement. (It is: some times possible to- control
this by the exact dimensions of each part in the
pencil, but in many‘cases where the maximum
«andmini-mum dimensional limits are` combined in
interchangeable part assemblies, a looseness ex
fists which allows the lead to be retracted by the
.extreme pressurev on the lead when the pencil is
held vertically.) The» spring washer of the pres- ‘
went. invention provides a brakeror pressure re
sisting meansto prevent or eliminate'unwanted
>mo-vement’of the lead. Furthermore, most me
.chanical‘pencils are ñtted‘ with erasers and quite
often when the eraser is being used, it will have ' a tendency to work the mechanism either forward
ñor backward depending upon the motion> of the
eraser. Thus', thev spring washer sets up a re
» sistan-ce against 'this unwanted movement. Some
:pencils are designed so that backward and- for 45
v-Wardmotion is possible' but there arem-any types
l»of mechanism-sv Where this motion must be con
trolled or restricted, and that isone of the pur
poses of the spring washer 34. `
»
ating mechanism becomes a complete unit.
parts. One disadvantage ofthe rolling method
is that any lack of uniformity or variation in the
barrel surface at this point, coming in contact
with some lack of uniformity of the eraser ferrule
would cause> an alternating variation between a
tight- and loose ñt so that as the user propelled
theY lead, it‘would bear tightly part of the turn
. and-_ then loosely during the balance of the turn,
and this wasl quite objectionable in the common
use of the pencil. The eraser ferrule in the
present construction bearing upon the spring
metal lock cup which in turn bears against the
barrel, permits the combination ñt to be manu
facturen to closer dimensions, resulting. in far
more uniform smoothness. in operation.
While'the» foregoing taken in‘connection: with
the drawings discloses preferred embodiments', of
the invention, it is apparent that changes may
be made in the details disclosed-without depart
ing fromath-e spirit of the; invention,- as expressed
in the following- claims.
What I claim and’ desire to secure by Letters
Patent is:
'
A
1. In a mechanical pencil,Y a barrel,v astation
ary channel tube positioned inf the barrel and
projecting from one end thereof, a spiral.,member ~ rotatably mountedv in the tube, a driving
ferrule fixed to the spiral» member and. bearing
against one end of the. channel tube;v a Iocls> V1:11p
mounted on said barrel7 a spring .means arranged
between; the lock cupl and. the last-mentioned
end portion of the channel tube, and a. second
ferrule surrounding the driving ferrule and-¿lock
cup and# frictionaily connected tof» the. driving
ferrule and lock cup.
' V2. Infa. mechanicalì pencil; a; barrel, a station
ary channel tube positioned in `the barreLa spiral
`memberV rotatably mounted in the tube, a driving
ferrule fixed' to one end portion. of' the spiral
member and bearing against one end portion of
Vtlire channel tube, a lock cup mounted on. said
barrel, a spring means arranged between' the
There are several advantages resulting from 50 lock cunfand the'last-mentioned end:V portion of
`the-use of the lock 'cup 31, as it provides a suit
the channel tube, and asecond rerrulesurround
able bearing surface for thespring. washer' in re
ing a portion of the barrer,` the driving ferrule
"lati-o'n to the exterior of the bottom'of the cup,
and; lockA cup andfrictionally connected to the
and also provides a positive stop Vagainstthe head
driving ferrule andthe lock cupiy
ofthe barrel M‘for assembly purposes by the in 55
3.1m ai mechanicalïpencil‘, a barrel, a stationary
side: of the bottom of the cup. It also-supplies a
channel tube positioned in the barrel andr having
suitable surface for' al press ñt or locking means
a ñange projecting at one emr;V thereof, a» spiral
1to1r properly seat `the eraser ferrule, and it fur
»member rotatably mounted in the tube., a driving
‘nisl'iesl a bearing surface permitting> the -lock cup
ferrule fixed to the spiral member‘andî. bearing
to rotate with the` rotation of the eraser ferrule
against one side of said. ñange, a lock cup-mount
for smoothness in operating the mechanism.
ed- on said. barrel and>` arranged at-'the opposite
The purposeV of the combined spring> washer
side of said. ñange, springA means; arranged be
and lock cup is to permit a spiral assembly (the
tween> the lock cup andi the last-’mentioned side
tra-cir on which the clutch and plunger travel) to
of the ñ‘ange and bearing against the cupf and
’become affixed to the lock cup by means of a driv
flange, and~ a second ferrule surrounding. a por
ing ferrule. If the mechanism were not suitably
tion of the barrel, the driving ferrnlerand‘ ibck
locked to the barrelY on the rotary' lock cup, the
cup, and frictionally connected to- the` driving
assembly would work out of the barrel, if the
ferrule` and lock cup;
user attempted to propel the lead andy conse
4.. Ina a mechanical pencil, a barrel, a: stationary
quently the mechanism would not function 70 channel" tube positioned> inthe> barrel and' having
properly; Conversely, by placing the lock. cup on
a ñange projecting at one end’ thereof, a. spiral
"the barrel which permitsY rotation, the spring
member rotatably mounted in the4 tube;V a driv
washer being held in place. by the'v channel tube,
ing'ferruiexñxed'to the spiral member and bear:
permits the driving ferrule to be forced over the
ing against one sidev of the flange, a- lock` cup
l‘oclrcu-p- and thereby locks the` parts together
mounted. on said barrel` and'V arrangedfat- the op
:2,482,852
5
posite side of the ñange, spring means arranged
between and bearing upon the lock cup and the
flange, the driving ferrule being of cup-shape and
having a rim portion projecting in a direction
opposite to the rim of the lock cup, and a second
ferrule surrounding the driving ferrule and lock
cup and frictionally connected to the rims
thereof.
`
5. In a mechanical pencil, a barrel, a stationary
member rotatably mounted in the tube a driving'
ferrule bearing against one side of the flange and
having its central portion iixed to the spiral
member and its outer peripheral portion formed
of resilient material, a lock cup mounted on the
barrel, arranged at the opposite side of the ñange
and having a'resilient rim, spring means arranged
between and bearing against the lock cup and the
flange for yieldingly urging them in opposite di
channel tube positioned in the barrel and having 10 rections, and a second ferrule'surrounding a, por
tion of the barrel, the driving ierrule and lock
a flange projecting at one end thereof, a spiral
cup, and frictionally secured to the rim of the lock
member rotatably mounted in the tube, a driving
cup and to the outer peripheral portion of the
ferrule ñxed to the spiral member and bearing
driving ferrule.
against one side of the ñange, a lock cup mounted
10. In a mechanical'pencil, a barrel, a station
on said barrel and arranged at the opposite side
ary channel tube positioned in the barrel and
of the flange, a resilient washer arranged between
projecting from one end thereof` a spiral mem
and bearing against the lock cup and the flange,
ber
rotatably mounted in the tube, a driving fer
and a second ferrule surrounding a portion of the
rule ñXed to the spiral member and bearing
barrel, the driving ferrule and lock cup and fric
against oneend of the channel tube, spring means
tionally secured to the driving ferrule and lock
arranged between the ñrst mentioned end of the
barrel andthe last mentioned end portion of the
6. In a mechanical pencil, a barrel, a stationary
channel tube, and a second ferrule frictionally
channel tube positioned in the barrel and hav
Y connected to and surrounding the driving ferrule.
ing a ilange projecting at one end thereof, a spiral
11. In a mechanicalpencil of the type having
member rotatably mounted in the tube, a driving
a
barrel,
a spiral member positioned in the barrel
ferrule fixed to the spiral member and bearing
and projecting from one end thereof for moving
against one side of the ñange, a lock cup mounted
the lead axially, and a rotatable member ñxed on
on said barrel, arranged at the opposite side of
the projecting end of said spiral member for actu
the ñange and comprising a bottom washer and a
ring-shaped rim, spring means arranged between 30 ating the latter, resilient means arranged be
tween said rotatable member and the last men
and engaging the ñange and the washer of theY
tioned end of said barrel for resisting movement
lock cup and yieldingly urging them away from
cup.
Y
.
one another, and a second ferrule surrounding a
in one direction when pressure is exerted on ‘the
lead toward the spiral member and when pressure
cup, and frictionally secured to the driving fer 35 in the opposite direction is exerted on the rotat
able member toward the spiral member.
rule and the ring of the lock cup.
Y
HELMER'R. JOCHIM.
7. A mechanical pencil as claimed in claim 1 vin
which the driving ferrule includes a resilient ring
REFERENCES CITED
normally tending to expand at one end of the rim.
40
The
following
references are of record in the
8. A mechanical pencil as claimed in claim >1 in
file of this patent:
which the lock cup includes a rim of resilient ma
terial normally tending to flare toward the mouth
UNITED STATES PATENTS
portion of the barrel, the driving ferrule and lock
of the cup.
p
Number
channel tube positioned in the barrel and having ß 1,466,906
a flange projecting at one end thereof, a spiral
2,138,233
9. In a mechanical pencil, a barrel, a stationary
Name
Date
Saunders _________ __ Dec. 18, 1923
I-Iauton __________ __ Nov. 29, 1938
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