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DeC- 27, ‘i949
J. T. BRUBAKER v
2,492,839
MECHANICAL RENCIL WITH BOTH STEP'BY‘STEP
AND GRAVITY FEEDS
Filed May 8, 1946
‘
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3 Sheets-Sheet 1
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INVENTOR,
JOHN TÍ BRUBAKER/
TTORNEY‘
Dec.' 27, 1949-
J. T. BRUBAKER
2,492,839
MECHANIGÀLff-ENCIL WITH BOTH STEP-,BY’STEP
'
Filèd May 8. >i946
Aun GRAVITY FEEDS
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INVENTOR,
JOHN T. BRUBAKER,
ATTORNEY.
_
Dec. 27', 1949
Filed May 8, -1946
_ _
--
...L T. BRUBAKER
_ n
_ __
2,492,839
MECHANLCA'L~PENCIL WITH _BOTH STEP-BY-STEP
AND GRAVITY FEEDS
3 Sheets-Sheet 5
ÍNVENTOR,
ATTORNEY,
Patented Dec. 27, 1949
‘2,492,839
UNITED STATES PATENT OFFICE
2,492,839
MECHANICAL PENCIL WITH Born sTEP~
BY-s'I‘EP AND GRAVITY FEEDS
J'ohn T. Brubaker, Luray, Va.
Application May 8, 1946, Serial No. 668,106
8 Claims.
l
This invention relates to a pencil wherein the
lead or marker is held, manipulated and fed
in such manner as to overcome the present lia
bility to breakage and with greater assurance
of positive feeding.
A second object is to provide a construction
»wherein the lead or marker may be fed by a
step-by-step movement or by gravity.
An object is to so construct the pencil that
(Cl. 1Z0-«9)
2
tudinally sectional view taken through a final
form of pencil; and
Figure 16 is a cross-sectional detail taken on the
line Iii-»I6 of Fig. 15.
Referring specifically to the drawings, wherein
like reference characters ydesignate like or sim
ilar parts throughout the different views, 'III des
ignates a barrel or casing preferably tapered
as at I I toward the writing end, and which barrel
the operating parts may be readily applied to 10 is prefer-ably made sectional as by having a cap
and removed from the barrel, being made in one
or two units preferably insertable and remov
able from the top of the barrel and the latter,
if desired, being sectional to facilitate such
insertion and removal.
Various additional objects and advantages will
become apparent from a consideration of the
I2 at its upper end detachably screw-threaded
or otherwise secured as at I3 to the barrel proper,
this Iseparable feature enabling the interior part
or parts to be readily positioned, inspected o1'
removed.
Disposed centrally and longitudinally of the
barrel IU as by detachably screwing it into the
lower end of the pencil by screw-threads I4 or
description following, taken in connection with
the accompanying drawings illustrative operaù
any equivalent, is a tube I5 to operatively posi
tive embodiments by way of example.
20 'tion the lead.
In said drawings:
Figure 1 is a central longitudinal sectional view
through one form of the pencil constructed in
Within the barrel I0 is a magazine I6 which
may be cylindrical of any desired shape in cross
section, shown of a size and shape to best accom
accordance with the invention;
modate two leads or markers I1, although it
Figure 2 is a longitudinal sectional View taken 25 may be constructed of a size and shape to con
approximately centrally and looking towards the
left in Fig. 1;
Figure 3 is a longitudinal sectional View taken
approximately centrally and looking towards the
right in Figure A1;
Figure 4 is a cross-sectional view taken on
the plane of line 4-4 of Figure 1;
Figure 5 is a cross-sectional view taken on the
plane 5-5 of Figure 1;
tain any desired number. The magazine I6
has a head or base wall I8 provided with a hub
I9 into which the lead tube I5 extends, such mag
azine being a plunger and slidable within the
barrel I 0 and on said lead tube I5.
Leads are
supplied to the magazine I6 through an upper
end which is normally closed by a head 20 de*
tachably telescoped into the magazine, and
which has an outwardly extending flange 2l over-
Figure 6 is a cross-sectional view taken on the 35 lapped by the inwardly extending flange 22 of
plane 6_6 of Figure 1;
'the barrel cap I2. A head 2€! preferably carries
Figure 7 is a fragmentary perspective view of
a rubber or other eraser 213.
l
one form of lead gripper;
Any suitable abutment means is provided on
Figure 8 is a central longitudnal sectional View
the interior of barrel II] at 24 or on the tube
taken through a modified form of pencil;
40 I5 and an expansive coil-spring 24| rests thereon
Figure 9 is an approximately central longitudi
and bears against the base I8, thus urging and
nal sectional view looking towards the right in
normally maintaining the flanges 2I and 22 in
Figure 8;
contact.
Figure 10 is a cross-sectional view taken on vthe
The head 20 carries a lead-conñning and posi
line IU-III of Figure 8;
45 tioning spring 25 tensioned so as to normally
Figure 11 is a cross-sectional view through a
occupy the position shown in Fig. 1 wherein its
modiñed form of lead magazine;
lower end is disaligned with the bore of the
Figure 12 is a cross-sectional view through a
feed tube I5, thus conñning a lead as shown, out
further modifled form of lead magazine;
of alignment with the bore tube and supported
Figure 13 is a central longitudinal sectional 50 on the base I8. However, when a lead is to be
View through another modified form of pencil;
'fed to the tube i5, the spring 25 is displaced across
Figure 14 is an approximately central longi
the bore of the feed tube I5 by sliding a plunger
tudinal sectional View looking toward the left in
or the equivalent 26 inwardly, such plunger be
`
_
.ing slidably mounted by a plug 21 detachably
Figure 15 is an approximately central longià 55 screwed or otherwise secured to the barrel l0
Figure 13;
2,492,839
>
3
4
result may be attained where the magazine as
-in Fig. l2 is of 8-shape in cross-section providing
the charge chambers 43 and the constricted pas
sage 44, which assists in straightening and posi
tioning the lead when aligned with the feed tube.
The grippers 3D and 34 need not be of the
specific construction and mounting shown since
they may be secured to any desired parts and
positioned as preferred. It will also be noted
that practically all of the parts may be removed
and having a movement relatively thereto limited
by an exterior button 28 and interior stop 29.
The lead in tube I5 is frictionally held in place
by the engagement of a gripper 30 therewith, the
gripper being carried by the tube I5, for instance
secured to an enlargement 3l thereon, and ex
tending through a slot 32 in the side of the feed
tube.
Attention is also directed to the fact that in
addition to the lead gripped by the gripper 30,
it is gripped or engaged by another gripper 33
depending from the hub I9 and having a gripper
portion 34 extending through an elongated slot
35 in the feed tube.l Said grippers 30 and 3‘4
preferably are all V-shaped at their gripping por 15
as a unit from the barrel upon detaching the cap
I2 and unscrewing the tube from the barrel at
I4. Also the various parts may primarily be
made of metal, although they may be constructed
of any of the plastics or otherwise, or of a com
bination of metal and plastic. Where plastic ma
terial is used, desired parts can be transparent
points 36 to engage the lead at spaced locations,
so that the interior action and position of the
better friction thereby being secured and danger
leads in particular may be observed from the
of relative slippage of the lead and grippers over
come. Gripper 33 is adapted to be moved to lead 20 exterior.
If desired, spring 24I may be dispensed with
releasing position through the engagement of an
tions as in Fig. '7, so as to provide a plurality of
and the pencil operated by shaking the same,
extension 3'I thereon with a cam on the enlarge
resulting in successive impacts of the sliding
magazine body I6 with the barrel, the impacts
In operating the pencil described, while the
lead in the feed tube is held by the gripper 3D, 25 being controlled so that grippers 34 and 3U oper
ate on the lead as previously described.
hub 2U may be depressed by means of short strokes
As to the modified form of Figs. 8 and 9, the
in order that the gripper 34 will engage the lead
barrel is designated 45 having a detachable
and feed it against the frictional contact of
pointed or tapered lower end 46 telescoped or
gripper 33 therewith, a number of short strokes
being used, if desired. If the lead is to be re 30 otherwise secured at 4l to the barrel. A lead feed
tube 48 is detachably screw-threaded or secured
leased from the feed tube, as in the case of a
at 49 to the part 4‘6 so as to slidably receive and
short used lead, so as to fall by gravity from the
hold the lead 55. Lead tube 48 is removable and
feed tube, a longer depression or stroke is im
at the upper end carries a disk or head 48I. The
parted to the head 25 in which extension 31
engages the cam surface 38, thereby releasing , lead tube has a slot 5I in its side through which
a gripper 52 extends into engagement with lthe
the lead, after which a rod 46 carried by the hub
lead 50, which gripper is carried in any suitable
I9 and extending slidably through the enlarge
way by the feed tube 48 or any other part as by
ment 3|, engages the inclined part 4I of 'gripper
an enlargement at 52. The gripper in this form
3D, thereby deñecting the same and disengaging
the lead, the lead thus being released by both ;= of the invention may be disengaged by the grip
per 52 by sliding a rod 53 inwardly, such rod being
grippers 35 and 34 and being free to slide by
accommodated in an opening 54 of the barrel and
gravity from the feed tube.
having
a bifurcated part 55 extended around the
Attention is called to the fact that the feed
feed tube and soldered or otherwise connected to
tube and leads are of such length that with the
grippers 30 and 34 retracted as just described 45 the gripper 52, thus causing the gripper to re
lease the lead.
and the pencil inverted, a lead will fall by gravity
The lead magazine in this form of the inven
from the feed tube entirely into the magazine
tion is shown at 55 and is closed with the ex
I6, following which the plunger 25 may be oper
ception of an outlet opening 51 in its bottom wall
ated to displace the partition 25, and upon again
positioning the pencil with the pointed end lower- . normally disaligned with the bore of the feed
tube, but which is adapted at times to register
most, and the pencil shaken or tilted somewhat,
with such bore, to enable the lead 5:) when re
another lead is aligned with the feed tube and
leased by the gripper 52 either to return to the
permitted to slide into the same into operative
ment 3 I .
magazine through the opening 5'I when the pencil
position where it will be engaged by the grippers
3U and 34, if desired, the pointed end of the pencil .
being held relatively close to a support to pre
vent any danger of the lead completely sliding
out‘of the feed tube before engagement by the
grippers 4I and 34.
`
The operation mentioned is particularly ad
vantageous where two leads are employed of
diiîerent colors or shades. This action is further
is inverted, or lead to fall by gravity from the
magazine through the opening 51 into the feed
tube 48. The magazine 56 is suspended normally
in the position shown in Fig. 8 by a leafsprîng 58,
and such spring is engaged by a push-rod 59 slid
60 ably mounted in a detachable plug 6U screw
threaded in the barrel,.such push rod being of the
same construction as that described at 56. Spring
'58 normally holds the magazine 5B in the position
shown, and alignment of the opening 51 with the
in cross-section, and for instance rectangular as
best shown in Fig. 4 since the leads will be bound 65 bore of feed tube 48 is eiïected by pushing the rod
facilitated by having the magazine relatively flat
to move readily, and when the position or loca
tion of one lead is known, to make a change to
the other lead or color simply requires rotation
59 inwardly.
Spring 58 is attached to any suitable part, but
preferably is carried by a head or plug BI de
tachably screw-threaded at 62 into the upper end
of the pencil 180° accompanied by operation of
the grippers, tilting, inversion and the like to 70 of the barrel 45, which further is preferably
equipped with a rubber or other eraser 63.
properly position the lead. This same result may
Magazine 56 may be rectangular in cross-sec
be attained where the magazine is not truly
tion as in Fig. 4 or may have the cross-sectional
rectangular in cross-section, for instance the
shapes of Figs. 11 and l2 since this form of the
magazine as shown in Fig. 1l, may have its main
walls 42 arcuate and concentric. Again the same 75 invention While it may be a magazine accommo
2,492,839
dating any desired number of leads .is -well adapted
secured to any accessible adjacent part and that
they are preferably engageable with the lead at a
plurality of points and thosek of the general con
for use with two leads of different colors, as in the
first form described, and which leads may selec
tively be positioned in the vfeed tube ’48 as de
scribed with respect to the first form.
,
Referring now to Figs. 13` and 14, another
modified form is shown. This îform employs ex
cept as slightly modified when Aso described, a
barrel 45, feed tube 48, leads 50, enlargement 52|,
gripper 52, screw-threads 49, push rod 53, and
detachable vend section 46 as described in the next
preceding form. Accordingly the same reference
characters have been applied.
In this form, feed tube 48__carrie`s a head 64
having 'a central flared bore t5 to >guide 'the leads
50 into the ñat tube 48. Preferabïy'two leads ‘are
employed, although any desired number may be
used, each lead being retained within a holder 66
open at the lower end and normally held dis
al'igned with the opening G5 by means of spring
brackets '56 .fastened thereto as at `6`| and depend
ing from a head B8 removably .secured to the
upper end of barrel 45 which, in this instance,
have exterior screw-threads b9 engaged iby 'the
screw-'threads of a ca‘p 1|), the head and ca'p hav
ing overlapping flanges as shown and the cap
preferably carrying a rubber or eraser 1|.
The
tubes 6B are adapted to be swung inwardly selec
tively to align their lower open ends with the
opening 65 to receive or discharge a lead, ac
cording to whether or not the pencil is in normal
position or inverted. The displacement and align
ment of the holders 66 is effected by sliding push
rods 12 inwardly, such push-rods being of the
same construction as those described at 26 and 59
and being mounted by detachable screw or other
struction shown in Fig. 7.
5
’
'
2. A pencil having a barrel, a feed tube screw~-
threaded to the writing barrel at said end and
extending interiorly thereof, a head interposed
between the top of the feed tube and the inner
Wall of the barrel, an enlargement on said tube
between said head and screw-threads, said tube
having a slot between said screw-threads and
said enlargement, and a lead-gripping member
carried by said enlargement and extending into
the tube through said slot.
3. A pencil according to claim 2 having means
extending between said tube, enlargement and
gripping member and movable against the latter
to move it to lead-releasing position.
4. A pencil having a barrel, a feed tube for a
In the final form of the invention disclosed in
lead
secured in the barrel against sliding move
Figs. 15 and 16, the structure and operation is
similar to that of the next preceding form, with 40 ment, a gripper constantly engaging and nor
mally retaining the lead in said tube, a second
the exception of the holding and feeding of the
plugs 13.
leads, corresponding reference characters accord
ingly having been applied to corresponding parts.
The barrel equivalent to 45 is here designated 14,
'
Various changes may be >resorted to provided
they fall within the spirit and 4Scope of` the
invention.
What is claimed is:
,1. A pencil having 'a barrel, a feed tube therein
for a lead,4 a gripper constantly engaging and
normally retaining the lead in said tube, a second
gripper for the lead, a dcpressible plunger means
surrounded by the barrel and exposed at the top
of the barrel operable in the bore of the barrel to
impart feed strokes to the second gripper not
withstanding engagement of the' lead as aforee
said by the first gripper, said grippers lconstitlii
ting the sole means affecting free sliding -of Ylead
into or out of the pencil through said tube, and
mechanism operable upon further depression of
the plunger means to selectively release either the
first-mentioned gripper or both of said grippers.
gripper for the lead disposed above the flrst grip
per, means operable to impart feed strokes to the
second gripper notwithstanding engagement of
and at the upper end is closed by a detachable 45 the lead as aforesaid by the first gripper, said
grippers constituting the sole means affecting free
plug 'I5 screw-threaded or otherwise secured at
sliding of lead into and out of the pencil through
1B to the barrel and preferably carrying a lead
said tube, and means operable to release both of
or earser 11. Depending centrally from the plug
said grippers through and after predetermined
15 is a stop 18 of any desired length and pref
erably generally of ovoid form at the lower end 50 movement of the second gripper.
5. A pencil having a barrel, a lead feed tube se
and equipped with any desired number of longi
cured to the barrel against relative sliding move
tudinally extending grooves 19, two for instance
ment, a plunger within the barrel slidably
as shown. In such grooves, the lower ends of the
mounted on the feed tube, means biasing the
leads 50 are retained under the pressure of spring
lingers 8U which are secured at 8| to the exterior 55 plunger away from the writing end of the pencil,
of the barrel 14, then extended inwardly through
said feed tube having first and second slots,
the slots 82 in the barrel and returning to the
gripper means extending through the ñrst slot
exterior and terminating in manually engageable
positioned to constantly engage a lead therein,
fingers 83. It will be understood that the desired
gripper means movable with the plunger extend
ñnger 83 may be engaged and pulled outwardly in 60 ing through the second slot and engageable with
order to release any desired lead 50, and that by
a lead in the tube to feed such lead notwithstand
tilting the pencil, the lead will register with the
ing engagement as aforesaid by the first gripper
opening 65 and slide by gravity into the feed tube
means.
48, it being advisable as in all other forms, to re
6. A pencil having a barrel, a lead feed tube se
lease the grip on the lead in the feed tube 48, and 65 cured to the barrel against relative sliding move
when the pencil is inverted, enabling the lead to
ment, a plunger within the barrel slidably mount
slide back into or return into the upper end of the
ed on the feed tube, means biasing the plunger
barrel to the desired slot or groove 19 and be held
away
from the writing end of the pencil, said
therein by the fingers or clasps 80.
It will be clear that in all of the forms as de 70 feed tube having ñrst and second slots, gripper
means extending through the first slot positioned
scribed with respect to the ñrst one that the
to constantly engage a lead therein, gripper
various parts aside from the leads or markers may
means movable with the plunger extending
be made of metal, plastic, transparent or other
through the second slot and engageable with a
wise, or a combination thereof. It will also be
clear that in all of the forms the grippers may be 75 lead in the tube to feed such lead notwithstand
2,492,839
ing engagement as aforesaid by the first gripper
means, the second-mentioned gripper means hav
ing a predetermined movement relatively to and
independently of the second gripper means.
7. A pencil having a barrel, a lead feed tube
8
therein secured 'to -an end of the barrel, an ‘en
largement on the feed tube, said tube having a
slot located between said enlargement and said
end, a lead-gripping member carried by said
enlargement and extending into the tube through
said slot, and a movable element terminally lo
cated between said enlargement, tube and grip
ping member operable from the exterior of the
mounted on the feed tube, means biasing the
pencil to disengage the gripping member from
plunger away from the Writing end of the pencil,
said feed tube having ñrst and second slots, grip 10 the lead.
JOHN T. BRUBAKER.
per means extending through the íirst'slot posi
tioned to constantly engage a lead therein, grip
REFERENCES CITED
per means movable with theÀplunger extending
through the second slot and engageable with a
The following references are of record in the
lead in the tube to feed such lead notwithstand 15 ñle of this patent:
ing engagement as aforesaid by the first gripper
UNITED STATES PATENTS
means, the second-mentioned gripper means hav
Number
Name
Date
ing a predetermined movement relatively to and
267,643
Bowman __________ _.. Nov. 14, 1882
independently of the second gripper means,
277,138
Knight ___________ __ May 8, 1883
means to release the second-mentioned gripper 20
1,584,050
Vail _____________ __ May 11, 1926
means after predetermined movement, and means
1,700,255
Feldman _________ __ Jan. 29, 1929
to thereafter release the ñrst-mentioned gripper
secured to the barrel against relative sliding
movement, a plunger within the barrel slidably
means.
8. A pencil having a barrel, a lead feed tube 25
1,846,604
2,028,855
Maloney _________ _- Feb. 28, 1932
Winter ___________ __ Jan. 28, 1936
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