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Патент USA US2116136

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May 3, 1938. « ì
Filed Aug. 13, 1936
Patented May 3, 1938
2,116,136 .I
Aurea o. Belang, St. Paul, Minn., assigner to
Brown à Bigelow, St. PauL‘Minn., a c0110?!
tion of Mlnnelota
Application August 13, 1936, Serial No. 95,816
s ein”, (ci. 1z0-1s)
My invention .relates to _an improvement in
pencils. and~more particularly to a'mechanical
pencil of an extremely simple type wherein only
a few parts are required.
Afeature resides in
5 - a flexible spiral driver which is operated by the
head of the pencil, and a spring locking sleeve
holds the driver in operating position.
Many pencils have been made which- operate
mechanically by rotating one vportion of the
l C pencil with respect to the other-to expel or
repel the lead. Most of these pencils, however,
are provided with `quite a number of parts,
thus increasing the cost of manufacture. While
simple mechanical pencils have been previously
15 manufactured, most of these- simple mechanical
pencils omit some important function in the op
eration of the pencil when constructed. In other
words, the simpliñcation of the construction has
been made by leaving oil.' some of the functions
of 'operation of the more complicated construc
Itis the object of the' present >invention to pro
to the other end of the tube, drawing the lead
into the tube, before inserting the tube into the
outer shell of the pencil, thus protecting the
lead within the spirally slotted tube.
It is a feature of my invention to provide a lead
carrier having means thereon extending out of
the tube through the helical slot and into en
gagement with the inner walls of the outer shell
of the pencil, to provide friction to prevent ro
tation of the lead carrier with the tube. A spring 10
tension is provided against the walls of the tube
which is sumcient to resist rotation of the lead
carrier‘when the tube is rotated.
It is a further feature `of my invention to pro
vide a pencil which will not permit breaking of
the lead by longitudinal pressure on the lead. The
lead operating mechanism of the pencil is sup
ported in the outer shell of the pencil by a fric
tion means sufficient to hold the lead operating
mechanism in place under ordinary writing pres- 20
sures on the lead. If, however, too great a strainr
is placed longitudinally on the lead, the lead op
vide a pencil with an outer casing which may erating mechanism containing the lead will be '
be made ofy metal or non-metallic material, and forced upwardly with respect to the outer pencil
wherein a lead pusher and carrier of a unique ' shell, thus preventing the breakage of lead. 'l'.'his 25
¿ design is provided having spring bowed portions releasing means of the lead operating mecha.-`
which are adapted to friction'ally engage inthe nism prevents damage to the lead as well as the l
casing to prevent rotation lof the carrier while operating mechanism by reason of the releas
the flexible spiral driving member is adapted to
ing of the spirally -slottedtube when too great
3 O be rotated to operate the spring lead carrier to ` pressure is exerted against either the writing
propel or repel the lead in the pencil.
It is al feature of my invention that when
‘ removed from the outer pencil. shell or casing,
lead, or the lead carrier is driven to the front or
writing end of the pencil and cannot be driven
«i ~
the lead propelling mechanism, if held in a ver
tical position, will cause the spring` lead carrier
c:e Cl
to rotate to twirl from one end to the other of
.These and _other objects and novel features of
my invention will be more' clearly and fully set
forth in the following specification and claims.
the spiral driving member to permit the removal » " In the drawing forming a part of my- speciñca
or replacement of lead therein. "I'he lead pro
peiling mechanism comprises a tube having a
Figure 1 is a longitudinal section of my pencil,
helical slot therein, and a lead carrier inter
woven through the spiral slot of the tube havingl
`a lead carrying end positioned axially in the tube.
’I'he lead carrying end is provided with a slidable
` sleeve for engaging the lead, so that the lead45 moves with the lead carrier. If the tube, when
removedy from the louter shell >oi' the pencil,
isl held vertically,A the lead carrier will move
downwardly in the tube, rotating‘as it moves.
in enlarged form.
‘ Figure _2 is an elevation view of
or casing of my pencil. >
-the outer
Figure 3 is a side elevation view of the tube
having the »helical slot therein, mounted on'the
head end of Athe pencil.
'A '
Figure 4 is a side elevation view, partially in
section, of the lead actuating carrier adapted to
When the lead carrier reaches its lowermost posi
be operated within the tube of Figure 3.
Figure o is a cross-sectional view on the lineA
tion, it extendsvbeyond the end of the tube. where>
5-,5 of Figure 1.
the lead may be quickly Aand readily removed or
replaced. When a new lead has been inserted
in the sleeve on the/end of the lead carrier,
My pencil A is provided with an outer shell
l0, tubular in shape, and tapering to a point ll
at the lower end thereof. ’I'o the shell I0 is at
tached a pocket clip l2, having a pocket engag
ing rounded end Il supported by a spring arm 55
` f the tube may be held Vwith the lower end upper
55 ` most. The lead " carrier will-then freely rotate
1l y
I4. Attaching flanges Il extend through holes
spring tension. The long longitudinal engage
in the' shell Il, and are clinched over on the
ment will resist the tendency for the lead car
rier 21 to rotate with the tube 25. The lead
carrier 21 is much more resistant to rotary move
‘insidelof the sneu n at n, to nom the cup lz in
proper position.
The lead operating mechanism of the pencil
A is mounted upon a pencil head I1. The head
I1 is of substantially the same diameter as the
shell III, and is concentric with the shell I3. The`
ment than to longitudinal movement, making it a
comparatively simple matter for the lead carrier
to move longitudinally when the tube 25 is ro
upper extremity of the head I1 is hollowed out '
'I'he operation of the pencil is believed clear
from the description. 'I'he lead is fed through 10
10 at I8 to accommodate the eraser I3. ’I'he lower
portion 23 of the head I1 nts within the shell the lead opening 33 in the point II of the tapered
I0, and is of slightly smaller'diameter than the
portion of the pencil by 'rotating the head I1 in
inside of the shell III. An annular groove 22 is
one direction. The rotation of the head I1 acts
to rotate the tube 25. Rotation of the tube 25
moves the plunger downwardly in the shell III, the 15
edge of the slot 25 engaging the arms 33, 35 and
31, and acting as a cam to urge the lead carrier
21 downwardly. 'I'he lead carrier 21 is kept from
formed in the lower portion 25 of the head I1,
15 intermediate the ends of the lower portion 2li.
A split spring ring 23 is mounted in the annular
groove 22. This ring is normally of slightly larger
diameter than the inner diameter of the shell I0,
but is formed of spring material, and readily con
20 tracts slightly upon pressure to slide within the
shell III. 'I'he outer surface of the ring 23 is
tapered as shown at 24, to permit this ring to
rotation by the engagement of the portions 34 and
38 of the lead carrier against the inner wall of 20
the shell I0.
When the lead carrier moves sufilciently, the
' slide readily into the end of the shell I0. 'I'he _lower end of the sleeve 28 engages the inner
head I1 is accordingly held in the upper end of tapered wall of the shell. Further movement of
the lead carrier 21 downwardly will move the
25 the shell I Il under spring tension, the ring 23
impcding longitudinal movement of the head I1 l lead carrier relative to the sleeve 28 until the
with respect to the shell I0. As the ring 23 sleeve 28 is entirelyœdisengaged from the lead
rotates readily within the groove 22, the rotary 40 of the pencil.
movement is not impaired by the friction ring 23.
'I'he angle of the groove 25 in the tube _25 is
The lower portion 25 of the head I1 is longi
such that when the tube l25 is removed from the 30
tudinally drilled to accommodate _the end of al
shell I0, the plunger will move toward one end or
tubular member 25. 'I‘he tube 25 is wedged into
the drilled opening, so that the tube 25 will ro
tate as an integral part of the head I1. 'I'he tube
25 is formed of a strip wound in helical form,
the other of the tube when the tube 25 is held
vertically. The weight of the lead carrier 21 is
suñlclent to cause the same to freely twirl down
providing a helical slot or groove 25 between suc
cessive convolutions. 'I'he tube'- 25 extends to a
point near the lower tapered end II of the shell
I0, and preferably contacts the inner wall of the
40 tapered portion to hold the tube in proper posi
tion within the shell Il.
A spring wire lead carrier 21 is provided within
the tube 25 for actuating the lead. A `sleeve 28
having a slot 29 in one side thereof surrounds,
and extends beyond, the lower end of this lead
carrier 21. A projection 38 on the vlead carrier
21 near the lower end thereof extends through
this slot 29, and holds the sleeve slidable on the
lower end of the lead carrier 21. A second pro
jection 32 on the lead carrier 21 limits-the sliding
movement of the sleeve 23, permitting the sleeve
to slide until the lead carrier extends from one
end to the other of the sleeve.
'I'he lead carrier 21 is bent at substantially right
angles to the axis thereof to provide an arm 33
wardlyin the slot 25. Thus, after a new lead has
been inserted in the sleeve 23, the tube may be
held vertically with the head I1 down, and the
.lead carrier will move toward the head until the
lead is entirelyl enclosed within the tube 25, or
virtually so.
As the friction of the sleeve or ring 23 is all
that holds the lead operating mechanism in the
shell III, it may be seen that abnormal longitudinal
pressure on the lead. will act to force the ring
out of the shell I8„thus preventing the breakage 45
of lead when too great a longitudinal pressure is
exerted against the same. It will also be noted
that the lead operating mechanism may at any
time be withdrawn from the- shell I8 Aby a longi
tudinal pull on the head I1.
In accordance with thepatent statutes I have
described the principles of operation of my pencil;
The lead carrier 21 is then bent to provide a
and while I have endeavored to set forth the best
embodiment thereof, I desire to have it under
stood- that this is only illustrative of a means of 55
carrying out my invention, and that obvious
changes may be made .within the scope of the
slightly bowed spring portion 34 engageable with
following claims without departing from the spirit
the inner wall of the outer shell I0.
of my invention.
extending through the slot 25 in the tube 25.
An arm
35 `att-substantially right angles to the axis of
the lead carrier extends through the slot 26 at a
point spaced above the arm 33, entering the tube
25. An axially aligned portion 35 extends-to a
point adjacent the arm 33, where an arm 31 ex
tends through the slot 26 in a direction opposite
to that of the arm 33. The arm 31 supports a
spring bowed portion 33, which engages the inner
wall of the shell III on the side thereof opposite the
engagement of the portion 34 of the lead carrier,
balancing the engagement of the lead carrier in
vtheshell or casing I3 of the pencil,
It will be seen that the formation of the lead
carrier 21 is such as to provide a pair of re
siliently supported portions 34 and 33 frictionally
75 engaging the inner wall of the shell Il under
vI claim:
l. A pencil comprising an outer casing, a head
engageable in one end of said casing for rotation,
a tapered writing end on the other end lof said
casing, a tubular spirally slotted. member extend
ing intoI said casing and secured to said head to 65
be operated by the same, and a spring Wire lead
carrier formed from a single piece of wire having
a lead carrying end extending axially in said
slotted tube and an axially disposed portion
spaced from the lead carrier end and having oppo 70
sitely disposed spring arms for engaging in the
casing to prevent rotation of the lead carrier but
permitting longitudinal sliding of the same in the
c_a'sing when the spirally slotted tubular lmember
is operated by said head.
2. A pencil comprising an outer shell'having
6. A pencil including an outer casing, a‘ ilex
ible tubular helically slotted rotatably mounted
a writing end formed on one end thereof. a
cylindrical opening in the' other end thereof, and
memberY extending approximately through said
'a lead operating mechanism including a head
adapted to support an eraser to close said open
ing, a collar portion formed on said head hav
ing an annular recess, a -spring collar freely dis
posed in said recess, a spirally slotted iiexible
entire outer casing axially` disposed therein, a
unitary lead operating spring wire member hav
ing axially disposed portions extending longi
tube secured axially in said collar portion of
tudinally engageable at angularly spaced points
tudinally in said tubular member, and a plu
rality of spring arm portions slidable and longi
10 said head and extending into the major por
with the inner portion of said casing to prevent
rotation of said lead carrier, and a slidable lead
socket supported on the front end of said lead
tion oi' the writing tip of said casing, and a spring
lead carrier interwoven into the spiral slots of
said tube having axiallydisposed portions with
15 variel> oppositely disposed spring shell engaging
7. A pencil including an outer casing, a tubular
-helical guide rotatably mounted in said shell cas
a lead carrying sleeve on one of said portions,
' ing, a lead carrier in said guide, means on said
`3. A pencil comprising an outer shell or cas
ing, a head rotatably mounted on one end there
of, a tubular member secured to said head for
rotation thereby, a helical slot formed in said
tubular member, a spring lead carrier having
portions axially disposedr in said tubular mem
ber, and spring arm portions extending through
said slot from said axial portions and adapted to
25 engage with said shell to prevent rotation of said
lead carrier, and a slidable lead receiving socket `
on one of said axially disposed portions df said
_ lead carrier.
4. A pencil comprising an outer shell having
lead carrier extending through'said helical guideat different points and provided with spring
means for engaging said casing under spring ten
sion to prevent rotation and to permit longitl - 20
dinal sliding oi' said lead carrierlin said casing,
and a lead receiving sleeve slidably secured to
said lead carrier, whereby said lead carrier may
be operated by said helical guide when said guide
is rotated to propel and repel a lead in said pencil. 2.5
8. A pencil including a writing tip, a lead pro
pelling and carrying means including an oper
ating head, a rotatable locking sleeve, a heli
cally slotted tubular member secured .to said
a cylindrical inner wall surface. a tubular mem
head, and a spring wire leadV carrier having a 30
ber rotatably mounted in said shell, said tubular
slidable lead receiving socket thereon, said lead ,
carrier having spaced apart axially disposed and
longitudinally extending portions for guiding said
porting a writing lead axially within said tubu
carrier, and spring means connecting said axially
lar member, means on said lead carrier engage
35 able with said slot, and spring arm means on> disposed portions for engaging within the cas
said lead carrier engageable with the cylindrical ing to hold the lead carrier against the rotation.
9. A pencil having- a removable lead propelling
surface of said inner wall of said shell to pre
vent rotation of said plunger with respect` tol 'mechanism, a casing for receiving said mecha-said shell.
nism. said mechanism including a spirally slotted
tubular member, a spring wire lead carrier hav
5. A pencil comprising an outer shell, a tubu
lar member rotatably mounted in said shell, a ing longitudinally disposed spaced apart portions
member having a helical slot, a member for sup- -
` helical slot formed in said tubular member, a
axially disposed within said tubular member,
unitary spring lead carrier having> portions ex
slightly bowed spring arm portions diametrlcally
oppositely disposed, and a slidable, lead socket
tending longitudinally within said tubular mem
ber, and spring arms formed on said lead carrier carried on one oi' said axially disposed portions 45
extending through said slot into resilient en- - of said lead carrier. , »
gagelnent with the inner wall of said shell at
oppositely 'disposed points.
vAlîill'ltlslD O. B'EISANG.
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