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Патент USA US2406171

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Aug. zo, 1946.
2,406,171
B. D._sMlTHÍ
MECHAÑICAL PENCIL
Filed Aug. 1v, '194s
2 sheets-sheet 1
I A.
'
AUS'- 20, 1946.
l
A
B. D. SMITH
v
2,406,'l 7,1
Filed Aug. 17, 1945
2 Sheets-Sheet- 2
MECHANICAL
PENCIL
Patented Aug. 20, 1946
ì' 2,406,171
UNITED STA-Tiss
@man
Blanchard Drake Smith, Atlanta, lG'a., as'signor "to
Scripta Manufacturing Company, Atlanta, Ga.,
a corporation of vGeorgia
..
,
\
Application August 17, 1943, serial No, 498,952
6 claims. (o1. :12o-_181)
l1
‘The invention relates to ‘mechanical pencils
.and has Ías an object the provision of` a'pencil
contains the lead bore and 'which terminates fin
a point member I 8 having shoulders at the vpoints
provided with vlead propelling and retracting
Fi, ifi, abutting against the -outer barrel »portionsv
'means of such a nature that ‘the lead receiving
Iâ) Iand il. The member il, as `*will be seen >in
bore of the pencil will ‘be only slightly `larger
`than :the lead itself, `whereby to provide support
Figures -4 vand 5, is formed `with slots I9, '20 :at
diametrically opposite portions yof _the lead-re
ceiving bore 2|, the slot 2li extending to the ‘sur
for the ‘lead throughout its length.
-
Aîfurther object of the invention is the provi
face of the member I'I.
sion of a thin c'luîtc'h operating in slots at diamet
i
` ‘
p
V-l`«./lova"cle in the slots I9 and 20, there is Vs‘lfiovv'n
ri'callyopposite -portions‘of the bore and provided` 10 the clutchv member 22 `which'is relatively thin
"with both propelling and retr‘acting means land
land' which is provided vwith the lead receiving
¿means ‘for ñn'al expulsion of'a lead ‘from the
jaws 23 extending from each vside of a yslit 2`4
clutch.
,
>
’
terminating in an opening .2 5 to provide flexibility
of Ithe clutch. Coacting with the clutch 22 is the
ì
A further object of ïthe invention Ais to- provide
>a .pencil having a novel `form of'lead magazine
designed to hold ‘at .ll'e‘a'st'two characters of lead
'either of 'which may 'be delivered ~fromjthe maga
>propellingmember 2-6 including a nut, carrying
>screw-_thread segments 2l, which Vmember ipro
jects through the slot 2l? and through the slot
of the sleeve i4 into engagement with the screw
Further objects will Yappear ‘from y'the 'following
threads vIii whereby revolution of the member I'I
description when Vread in vconnection with the ac '20 caused by holding-the point I8 and revolving vthe
companying drawings, wherein:
>outer barrel will cause traveling of the rmember
' Figure f1 is a side elevation of 'the complete
carrying with it the clutch 22 -and Yan engaged
l»Zine 'at will. `
’
pencil;
'
Y
"
lead.
The Aclutch 22 isshovvn as ¿formed with a 'slot
`
Figure 2 is a detail side view'partly in central
longitudinal `~section, drawn ’to fan enlarged scale;
Figure '12a is fa 'section similar to Figure ’2 show
T39 Vhaving" an oiîset providingjcam surfaces 3l
'and 32 at 'its opening which coact with a lug
33 carried by the member 26. The member V26
‘is also shown Wi-th a laterally projecting shoulder
SII lstanding normally between »the jaws `23 as
ing a different position 'of parts; '
Figure 3 is adetail‘side elevation of a 'magazine
portion of the pencil, vdrawn to rthe :scale of‘Fig
ure 2;
l
-
Figures 4, 5, `and 6 are further venlarged trans
verse sections taken-on lines 4-4, »5_5, and 6_6,
respectively, of Figure «2;
Vlï‘igure 7 is a still `fur-ther Ienlarged perspective
view :of the propelling mechanism.;
Figure .8 is :a `like view »of the clutch; and
Figure 9 .is a like view of the magazine control
plate.
.
»
l30
shown in Figure 2a. In this position of the parts
fthe vlug i3d vstands ‘between the cams 53'I and 32.
ïii'fthe normal use 'of the -pencil, the lug 33 vcan
»notffurïther' enter the slot 13S lsince the surface 35,
‘underlying the interior of the barrel is prevented
5by the interior ofthe ‘barrel I3 from moving out
`vvard-ly andthe member 25 and the clutch 2_2 must
~travel, together.
‘
'
‘A VAdjacent the point I8 the screwthrea‘ds -I3 ‘of
As shown, the invention. embodies a double
the lbarrel I() _are omitted and a tubular member
ended pencil for the carrying of leads of different 40 'Slis inserted. The internal dia-meter ofthe
characters as, for instance, red and blue, soft
member 5? yis shown as substantialiy equal to the
and hard. The propelling .mechanism at each
root diameter oi fthe screwthreads I3, 'and is at
end of the pencil may be ofthe character of that
leastfsu?ñcient to permit an outward movement
’shown in detail in the drawings.
of 'surface 35 >to bring vslot t0 'into alignment with
As shown, the barrel of the pencil i's formed >
with three outer casing parts I0, I I and I2, which
parts may be formed of synthetic plastic. The
parts I-0 'and I2, las shown in connection with
part I0, are provided with internal screw-threads
I3. A continuously slotted metal sleeve I4 ex
tends within the barrels I0, II and I2- and may
be continuous throughout the length of the pen
cil between the points I5 and I6.
Within the sleeve I4 at each end of the pencil,
there is shown a slotted tubular member Il which
lugiä’â. "The "inner ‘opening of the lmember* 3l is
‘shown as formed with an annular ñange 38 ‘the
‘edge of ‘which 'aligns with the 4crests of said
Ascrewthreads.
The -outward movement of :the
surface 35 occurs when the clutch 22 reaches its
outward travel and the lug 33 acting on cam face
3| forces the clutch outwardly and so retains it
during the expulsion of the lead by continued
advance of the lug 33 in slot 30, and the arrival
or" the projecting shoulder 34 at the pencil point
opening as shown in Figure 2. When the clutch
2,406,171
.
‘
3
_embodiment of the invention `within the scope of
the appended claims without departing from the
spirit thereof.
22 has reached the end of its outward travel, the
said portion 'of the clutch 22 is free to move out
wardly into thegreferred to engagement inthe
slot 2l) and such movement is caused by cam ac
tion of the lug 33 upon the cam 3l. ' The clutch
I claim:
~
'
,
1. A mechanical pencil structure comprising a
cylindrical body member having a marking-ele
ment-receiving bore open for protrusion of the
element> and a longitudinal slot opening to said
bore and to the surface of the member.; an inter
22 thus has'its forward travel checked and at the
same Atime is moved outwardlyV so that the lug
33 aligns withV the'slot 30 and further movement
’Y of the-»nut 2r acting through the shoulder 34
expels the lead from the clutch, the parts assum l0.
inally screwthreaded sleeve member surrounding ~
said body member and closing said slot; ' saidv
ing the position shown >in Figure 3.
Upon retraction of the nut, the-mg 33, Striking
the cam* surface 32, will again move the clutch
v members associated for» relative rotation; mark
to the position shown in Figure-2aA whereupon a
i comprising a propelling portion and a clutch por
new lead may be inserted to .be frictionally
tion in side by side relation; said propelling por
grasped by the jaws 23. Y
tion formed with a screwthread element coacting
with said internal screwthreads and with a shoul
ing ‘element control means slidable in said slot and
1
The combined thickness of the propelling mem
ber 26 and the clutch 22 is'less than the diam- " " ' der positioned to impinge upon the end of a mark
ing'element held by the clutch portion; one of said
-eter ofthe bore, and the required width-of slot..`
for their reception leaves more than 180° of arc 20 portions formed with , a longitudinal Y Vslot with
complemental diagonal cam surfaces at an end
_of the bore so that the leadwhich forms a good
thereof; the other o_f said portions carrying a lug
¿slidingiit in the bore will be supported through
lout its length and thereforev colored leads which
normally contacting one of said surfaces; an edge '
-of said clutch portion underlying a part of one of
„maybe weaker `than black` leads are better able
«to» support »pressure against the points which, ex‘ 25 said members to prevent `edgewise movementA of
said clutch portion; the part of said member over
cept Vfor ,this_support, wouldcause iiexure and
.possible breakage of the lead'.
.
v»
_
lying saidedge Ícut away adjacent the opening of ,
>
The magazine portion II- of the pencil is lined
_bythe sleeve I4 andis divided into two portions
.byu/leans of a‘plate .39,.an end of which plate 40
the boreto permit such edgewise movement; land
means whereby, at the limit of travel of the 'con
trolÍmeans, edgewise-movement of the'clutch por
»is received in a slot 4I at one end of the barrel
tion permits entry of the` lug into thel slot and Y
portion II.~
_further travel of the nut portion causes expulsion
.
'
.»
e
§
`To provide for ñexure'of the plate 39 it is slitted
of the marking element.
ofthe member overlyingthe clutch edge is the in
Aoi which Vis slightly more than the diameter of
the lead plus the thickness of the plate 39. The
plate 39 is shown as formed with a roughened
thumb lug 43’ projecting through an opening 44
inthe end of the barrel portion I I.
'
ner surface of the sleeve member.
of. When itis forced to one side to the position
shown ‘by dotted lines> in Figure 6, a lead may
escape from the other side of the magazine as
>indicated by dotted lines in said figure. An in
dication of the color »of lead which may be se
cured by moving the thumbpiece 43 in either di
rection> is desirably placed upon the exterior of
-the barrel as shown at 4'5. ' '
.
. To assemble the pencil structure the partition
,'39 isinserted into the sleeve I4 and the sleeve
>and partition are placed in the magazine casing
fII. The casings .I0 and I2 are then slipped on
.thesleeve' I4 after which the bodies I1 carrying
the members 22 and 26 are forced into the sleeve
from its opposite ends, the bodies forming a tight
Iiit in the sleeve "so as to be not revoluble therein.
'
3. The structure of claiml wherein the slot
formed in the marking element control means is
formed in the clutch portion.
.4o
l When standing in the central position, the plate `
Ó39 prevents egress of leads from either side there
`
2.*The structure of claim 1 wherein the part
Aby. right angular s1it~42. - The magazine is Vshown
-as formed with an elongated opening 43 the width
4. The structure of claim 1 wherein the cylin
drical body member is also formed withV a longi
tudinal slot diametrically aligned with said first
>named slot and open to said bore with the clutch
portion entering both slots.
5. The structure of claim 1 wherein the slot in
the body portion terminates short of the marking
element protrusion opening.
n
6. A mechanical pencil structure comp-rising in
combination: .a' central cylindrical body member
50 formed with a marking-element receiving bore,
with a longitudinal slot opening vto said bore and
to the surface of the body, and with a second slot
diametrically opposite theÍñrst named slot and .
opening to said bore; the Width of said slots be
ing less than the diameter of said bore; an inter
nally screw-threaded cylindervmember surround
' ing said body member; said members associated
for relative rotation; marking-elementclutch
ÍThe margins of the slot in the sleeve I4 being
'means
mounted to travel in said slots; marking
turned to overlie the ñattened portion of the slots 60
elementdrive means also traveling in at least .one
20 in the bodies I'I assist in preventing relative
of said slots and. having screw thread segmentsy
»rotation between the bodiesand the sleeve.
When the bodies I1 are inserted the nut and
clutch k»members occupy they relative positions
' shown in Figure 2 and during the last part of
the insertion the casings I0 and I2 are revolved
coacting with said internal screw threads; and
means coacting between said drive and clutch
means» to cause movement of a marking-element
gripped by said clutch means.
,
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ß
'
' vto engage the nut with the internal screwthreads.
Minor changes may be made in the physical
BLANCHARD DRAKE SMITH. _
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