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Патент USA US2108668

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35, T193.
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MECHANICAL PENCIL
Original Filed Aug. >2l, 1929
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PAU L. S HAUTON
EY HIS ATTORNEY
W ¿QW
2,108,668
Peienied Feb. 1s, 193s
UNITED STATES PATENT OFFICE
i 2,108,668
MECHANICAL PENCIL
Paul S. Hauton, Atlanta, Ga.
Original application August 21, 1929, Serial No.
387,542. Divided and this application Septem
ber 21, 1932, Serial No. 634,099
5 Claims. (Cl. 1Z0-18)
operating parts in partially disassembled condi
My invention relates to pencils of the “me
tion.
chanical” type, having means foradjustably pro
jecting and electing the lead, and is a division of
Fig. 5 is a detailed view of one form of- operat-4
my copending application Serial No. 387,542 filed
ing screw or helix.
Fig. 6 is a similar view of a modified operating
August 21, 1929.
'
The purpose of the invention Ais to provide a
generally improved, simplified and economical
structure, and especially to provide an improved
screw or operating helix, guide sleeve, lead grip
and ejecting pin.
In pencilsof Lthis class, the operating screw or
helix has frequently been in the form of a
helical wire or strip with spaced turns, and in
such devices the spacing of the turns is liable to
alteration after assembly of the pencil. I pro
vide an operating screw or helix consisting of an
originally flat straight strip of sheet metal, and
coil it into a helix with the strip edges in con
tact, the strip being cross-sectionally formed to
2
provide a channel; or else I interpose a helical
wire between the edges of the strip, so that in
either case the turns of the strip are secured
against variations in spacing.
I also provide in combination with the operat-v
ing screw'and a slotted guide sleeve, a lead grip
sleeve therein, and ejecting pin within the grip
sleeve, and lugs on the grip sleeve and pin en
gaging the helix of the screw,- together with a
sleeve near the vtip end of the pencil case or body
30 and arranged to receive the grip sleeve lug
while the sleeve is in ejecting position. II'he guide
sleeve ls also arranged to have frictionalV co
operation with the grip sleeve lug to secure the
proper relative positioning of the grip sleeve and
35 ejecting pin as thevlatter is withdrawn to permit
the insertion of Aa Vfresh lead.
'I'he characteristics and advantages of the in
vention are further suñiciently referred to` in '
screw or helix.
/
'
Referring first to Figs. 1 to 5:
In the form shown, the case or body l is of
relatively thick section and may be of wood, al
though the case structure may be varied without 10
affecting other features.
The
operating
screw
-
or
helix
2
extends
throughout the greater part of the length of the
case bore and may have a frictional .fit therein,
which is suilicient to secure the helix against
rotation.` In the form shown in Figs. 1,‘2 and 3,
the screw consists of an originally flat strip of
sheet metal, the edges of which are bent at
right angles to form shallow flanges 3.
This
strip is wound or coiled into helical form with
the flanges in contact, thus producing a wide
helical channel or thread formation li to co
’ operate with lugs of the grip sleeve and ejecting»
pin, as will appear.
In the variation shown in Fig. 5, the metalr
strip is formed with a, central bead 5, so that
when wound to helical form, the edges of the
strip abut and the successive turns of the bead 5
provide the screw channel therebetween. ’ In the
variation shown in Fig. 6,> the metal strip 2a is
flat without edge flanges or bead and it is Wound
into helical form with an interposed wire 5, also
hellcally wound and with which the edges of the
strip engage, the wire in this case providing the
sides of the screw thread formation or channel,
the bottom of which is formed by the inner sur
face of the strip.
l
A short sleeve or tube 6 is inserted with a fric
tional fit near the tip end of case l; this sleeve
connection with thefollowing detail description
40 of the accompanying> drawing, which shows cer vbeing cylindrical and providing a chamber to 40
tain respective embodiments. After considering receive the lead grip sleeve lug in one operative' ,
these examples, skilled persons will understand position, as will appear.
Within the helix 2 is a longitudinally slotted
that many variations may be made without de
guide
sleeve l, the upper end of which is pro
parting from the principles disclosed, and I con
vided `with prongs 8 inserted and clenched in
45 template the employment of any structures that
are properly within the scope of the appended
claims.
'
'
'
Fig. 1 is a longitudinal section of a pencil em.
bodylng the invention> in one form. -
'
Fig. 2 is a similar section of the lower end
portion, showing another operative position.
Fig. 3 is a similar view showing still another
operative position. _
u
‘
Fig. 4 shows ~the vvguide sleeve and certain co.
slots in the upper end 9 of a thimble I0, which
is revolvable on the reduced` upper -end portion
of the case and secured against kaxial displace
ment by a bead ii pressed in the sleeve and
engaged in an angular channel ln the case. A
sleeve I2 is frictionally engaged over thimble
l0. Instead of a plurality of slots obviously one
slot might accommodate both prongs. The outer
portion of sleeve l2 receives an eraser I2a, or
a cup or thimble I3 of sheet metal in which the
2
2, 108,668
eraser may be placed, removal of thimble I3 being
prevented by pressing or spinning inward the
edge I4 of sleeve I2. By the described arrange
ment, the guide sleeve 1 may be rotatedin rela
tion to the case and helix 2 by turning sleeve I2.
A lead grip sleeve I5 is slidably located within
the guide sleeve, and the grip sleeve has near
gage .in the screw channel; and thereafter both
of the lugs are withdrawn toward the upper end
of the case and in properly spaced‘ relation, as
above referred to, by rotary movement in the
screw channel as impelled by the guide sleeve.
I thus provide in a simple vand inexpensive
structure, for positive regulable projection of the
its upper end a, closed slot I6 to accommodate a
lead, for positive lead butt ejection, and for con
relatively long _and narrow lug I1, of an ejecting
venient reloading, with definite control of the
pin I8, which is slidably located within the grip grip sleeve'and ejecting pin during reloading, 10
sleeve. The lug I8 may be formed by bending and positive retraction of the grip sleeve with
the pin, as clearly shown in Fig. 1. ’Below slot the lead into the pencil after reloading, all by
I6, the grip sleeve has formed thereon a rela
manipulation of the one controlling element,
tively long and narrow lug I9, passing through namely, sleeve I2.
~
15 the slot of- the guide sleeve. Lug I1 also passes
I claim:
15
through the slot in guide sleeve and both the.
1. A mechanical pencil comprising a casing
lugs engage in the channel of the screw or helix having a reduced cylindrical end,v the cylindrical
2. A lower end portion of the slot in the guide end forming a shoulder and an axial internally
sleeve is relatively narrow or constructed as at threaded bore in the casing coextensive with the
20 20, Fig. 2, for frictional cooperation with lug. I9,
casing and reduced end, a slotted' rotatable feed 20
as will appear. The lower end of the grip sleeve tube in the casing bore having a split end form
is slotted as at 2| to provide a lead grip.
ing locking prongs, an inverted thimble jour
lA metal tip 22 is fixed at the lower end of the naled on said reduced end having an opening
case by providing it with an upper or sleeve por
engaged by said prongs to lock the thimble and
25 tion 23 telescoping within sleeve 6 and friction
slotted tube>r together, the lower` circumferential
ally or otherwise retained. The bore 24 at the edge of the thimble riding on the shoulder, a
lower end of tip 22 provides a lead guide. A lower manually operable sleeve of substantially the
inner portion of the tip^22 is recessed or conical same outside diameter as the casing frictionally
as at 25, so that'when in ejecting position, the ñtting the outside of said thimble and projecting
30 lower end of the grip sleeve will engage in this i above the upper end thereof to conceal the end 30
conical portion, the guide bore 24 to check fur
of the thimble and having its lower circumferen
ther outward movement of the grip sleeve.
tial edge riding on the shoulder.
10
When a fresh lead has been inserted in the
2. A method of producing a mechanical pencilA
lead grip‘and the grip sleeve is withdrawn to including laterally bending edges of a thin fiat
35 any intermediate position Within the pencil, the
sheet metal strip to form thin ñanges along each
grip sleeve and ejecting pin I8 are positioned as ‘ edge of the strip, then tightly coiling the flanged
shown in Fig. 1; that is, the lower end of the` metal strip to form an internally threaded tubu
pin vI8 is withdrawn from the lower end of the lar member of small diameter and then snugly
grip sleeve sufficiently to permit proper' engage
fitting the tightly coiled tube in a casing bore,
ment of the lead end within the gripping forma
the bore being of substantially the same di 40
tion of clutch of the sleeve, this proper position
ameter as the outside diameter of the tubular
ing of the grip sleeve and pin being maintained member whereby the tubular member is- pre
by engagement of their respective lugs i1 and I9 vented from uncoiling and the edges of the coils
in the screw channel. The lead is then projected are maintained in contact.
as desired by rotation of sleeve I2, thus causing
3. A mechanical pencil comprising a casing
rotation of the guide sleeve 1 which in turn having a reduced cylindrical end, the cylindrical
causes the lugs I 1 and I9 to rotate and to be
end forming a shoulder and an axial internally
moved downward, with maintenance of their
threaded bore in the casing coextensive with the
casing and reduced end, a slotted rotatable feed
tube in the casing bore having a split end form 50
ing locking prongs, an inverted thimble jour
nailed on said reduced end, having an opening
engaged by said prong to lock the thimble and
slotted tube together, the lower circumferential
edge of the thimble riding >on the shoulder, and
a manually operable sleeve of substantially the
proper spacing, as controlled by the screw chan
50 nel or helix. When the end of the grip sleeve
approaches the lower end of the conical forma
tion 25 of tip 22, lug i9 passes out of the screw
channel or helix and is located in the clear an
nular chamber provided by sleeve 6, and the
55 grip sleeve is, therefore, permitted to remain
stationary while continued rotation of sleeve l0
causes further outward movement of the eject
ing pin by cooperation of its lug with the screw
channel, and finally the end of the pin forces
60 out the lead butt, as shown in Fig. 3.
Reverse rotation of sleeve I2 then first re
tracts the ejecting pin’by movement of its lug
I8 in the screw channel while th`e grip sleeve is
prevented from upward movement by frictional
65 engagement of its lug I9 in the narrow slot por
tion 20 of the guide sleeve. This condition con
tinues until lug I1 engages the upper end of
slot I6.I At this time, the lower end of the eject
ing pin is withdrawn suiiîciently to permit in
70 sertion of a fresh l'ead into the gripping end of
the lead grip sleeve, and further rotation of sleeve
I2 4in the reverse direction then acts by engage
ment of lug I1 with sleeve I5 at the upper end
lof slot I6, to retract the grip sleeve longitudi
75 nally until its lug I9 is in position to again en
same outside diameter as the casing frictionally
iitting the outside of said thimble and projected
above the upper end thereof to conceal the end
of the thimble.
~
4. A mechanical pencil comprising a casing
having a reduced cylindrical end, the cylindrical
60
end forming a shoulder and an axial internally
threaded bore in the casing, a slotted rotatable
feed tube in the casing bore having a split end 65
forming locking prongs, an inverted thimble
journalled on said reduced end, having an open
ing engaged by said prong to lock the thimble
and slotted tube together, and a manually oper
able sleeve frictionally fitting the outside of said 70
thimble and projected above the upper end there
of to conceal the end of the thimble.
5. A mechanical pencil comprising a casing
having an axial internally threaded bore in the
casing, a slotted rotatable feed tube in the casing 75
2,1os,ecs
`
3
bore having a split end forming locking prongs, above the upper end thereof to conceal the end
an inverted thimble journalled on said reduced
end, having an opening engaged by said prong
to lock the thimble and slotted tube together,
o! the thimble, the casing having a shoulder por
tion to provide a riding surface for the-lower
circumferential edge of the thimble.
and a. manually operable sleeve frictionally ?t-
ting the outside of said thimble and projected
\
'
PAUL S. HAUTON.
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