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Патент USA US3079903

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Mad* 5, i963
Filed D'e‘c.. 14, 1959'
' '
2 Sheets-Sheet 1
- March 5, 1963
2 Sheets-.Sheet 2
Filed Dec. 14,- 1959
United States Patent 0 "
Patented Mar. 5, 1953
lowing description and the accompanying drawings which
include a preferred embodiment of my invention.
FIGURE 1 is a longitudinal view, partly in section, of
the writing instrument of the invention, wherein the writ
ing points at each end of the instrument are exposed for
Frank T. Iohmann, 49 Hampton Drive,
Berkeley Heights, NJ.
Filed Dec. 14, 1959, Ser. No. 859,201
8 Claims. (Cl. 12d-42.1)
writing use.
FIGURE 2 is a longitudinal view, partly in section, of
the writing instrument of FIGURE l, wherein one of
the writing ends has been pressed inwardly relative to
This invention relates to an instrument having a re
the barrel by pressing said point against a rigid surface.
tractable member or implement at both ends of the l0
FIGURE 3 is a longitudinal view, partly in section,
instrument. Particularly, the invention relates to a ball
of the writing instrument of FIGURE 1, wherein the
point pen or pencil, having a writing point at both ends
points at each end of the instrument are concealed after
of the instrument, which point may be either exposed for
having been lifted free from the rigid surface.
writing or shielded for non-Writing use by pressing the
FIGURE 4 is a cross-sectional view taken along the
tip portion of the instrument against a rigid surface.
lines 4--4 of FIGURE l.
In my prior patent application, U.S. Serial No. 841,243
FIGURE 5 is a side view, partly in section, of a por
I have described a tip-actuated ballpoint pen wherein the
of the actuating mechanism.
writing point could be either exposed or concealed either
FIGURE 6 is a schematic drawing illustrating the rela
by pressing the point against a rigid surface or by press
tive positions of the various components of the actuating
ing a pushbutton located at the top of the writing instru 20 mechanism at various stages of operation of the
ment. In my present invention I have further extended
retraction-protraction cycle.
the principle of said Serial No. 841,243 by eliminating
FIGURE 7 is a longitudinal view, partly in section, of
the pushbutton and instead providing another point to
another embodiment of my invention, wherein the expo
form an instrument having a writing point at each end
sure or concealment of each point is independent of the
of the instrument, wherein both points are tip-actuated.
other and wherein both points are concealed.
The advantage of the present invention is that it permits
FIGURE S is a longitudinal view, partly in section, of
the utilization of different colored writing inks or types
the writing instrument of FIGURE 7, wherein one end
of inks in the same instrument. For example, one point
of the instrument has been pressed against a rigid surface
can be adapted to write with blue ink while the other
to actuate the retraction-protraction mechanism.
point can Write with red ink. Or one point can write
FIGURE 9 is a longitudinal view, partly in section, of
with ink while the other point can write with fluid lead.
the writing instrument of FIGURE 7 showing the lower
Numerous other combinations are, of course, possible.
point exposed for writing after being lifted free from
In fact, the principle of my invention can be extended
the rigid surface.
vto fields other than writing instruments, such as by the
FIGURE 10 is a cross-sectional View taken along the
provision of small tools, needles, picks, etc. in the instru
ment in place of a writing point and cartridge.
While it has been previously known to provide several
lines 10-10 of FIGURE 7. -
FIGURE 11 is a fragmentary view of an alternate
construction of a portion of the actuating mechanism of
writing points or lead sticks (in the case of mechanical
pencils) within the same barrel, it had been generally
necessary to actuate the selection of said points or leads 40
by buttons or other protuberances projecting through the
side of the barrel. A disadvantage of this type of instru
ment was the inconvenience of actuating the device.
Also, the protuberances are generally in the area where
FIGURES 1 to 6.
Reference is now made to the drawings in detail and
particularly to the embodiment of FIGURES 1 to 6.
The writing instrument has an outer tubular casing or
barrel including the lower barrel section 10 and the upper
barrel section 10', which sections are joined together by
engagement. The outer ends of the respective
the instrument is grasped in the hand. Such protuber 45 threaded
barrel sections 10 and 10' are each tapered inwardly as
ances can be avoided by the device of the present inven
at 11 and 11' and terminate in open ends. The bore
tion. At the same time, the present invention pro'vides
extending through the tubular casing is reduced in its
retractable points which are readily exposed or concealed
cross-section at both ends of the casing as indicated at
by merely pressing the desired writing end of the instru
50 12 and 12' to thereby form annular interior lips 13 and
ment against a rigid surface.
13’ respectively. Seated upon said annular lips are
In one embodiment of my invention, I have shown two
tubular hood members 14 and 14', the outer end of
point-and-cartridge units which are actuated by a common
each of said tubular members normally projecting
the adjacent open end of said casing and having
the instrument against a rigid surface will serve to either
expose or conceal both writing points together by the 65 an inwardly tapered surface. Cartridges, 15 and 15',
formed with the respective flanges, 16 and 16' are pro
same single action. Frequently, a person using the instru
each having a short terminal yfeed tube 17 and 17',
ment will wish to have both points available at the same
respectively, which in turn carry the respective writing
time for writing, or both points concealed at the same
mechanism. In this embodiment, pressing either end of
time when not in use.
balls 18 and 18'.
With the previously discussed
In another embodiment of my invention I have pro
vided a pen wherein each of the two points may be
independently exposed or concealed without etlïecting the
position of the other point.
said hood members. Proximate the center of the casing
65 and longitudinally slidable therein, is carried a latch
While not shown in the drawings, it will be obvious
that my instrument can be advantageously used in con
junction with a normal press-on cap carrying a clip,
although, of course, such a cap is not essential to the 70
present invention.
The invention will be further understood by the fol
Said cartridges 15 and 15’ are each
longitudinally movable within the respective hood mem
bers 14 and 14', their outer movement being limited by
engagement of the shoulder 19 and 19' of the cartridge
with the proximate interior annular lips 20 and 20’ of
embodiment, the single action at either end of the pen
simultaneously exposes or conceals both points.
actuating mechanism. 'Ihis mechanism includes the
tubular sleeve 21, having the closed upper end 22, while
projecting upwardly from said end 22 is a tubular nipple
23. Fixed Within said sleeve are the tubular latch
members 24 and 25 which are in spaced relationship to
each other. The top rim of the lower latch member 24
is vformed with radially spaced deep slots or recesses 2.6
which are open at their upper end. Also formed in said
top rim between said deep recesses 26, are pairs of up
wardly projecting shallow teeth 27. Each 'tooth 27 has
a vertical edge 27’ and a tapered edge 27” (see FIG
URE 6). The lower rim of the upper latch member 25
-is' also notched to form the downwardly-projecting radi
ally spaced teeth 28, each having a vertical edge 28’ and
a tapered edge 28". Said downwardly projecting teeth
28 are radially offset from the upwardly projecting teeth
27 and are adapted to cooperate therewith in a manner
same time, both the writing points 18 and 18' are now
in a retracted position within their respective hoods 14
and 14'.
_ _
To extend the points from their retracted position
within the instrument, one of said points (c_g. 18) is
again pressed downward against a rigid surface. First
the hood 14, and then the point 18 along with its car
tridge 15 and its sleeve 29 are moved upwardly within
the barrel. During the initial portion of this upward or
inward movement, the sleeve 21 also moves upwards
within the barrel with its closed end 22 abutting against
to be later explained. Slidably extending through said
the inner end of the cartridge 15’ which in the meantime
lower tubular latch member 24 and slidably extendable
has become fixed against further upward movement as
into said upper tubular latch member 25 is a cylindrical
,its shoulder 19" seats against the shoulder 20' of the
member 29 which is formed with a groove or race 30 15 hood 14 which in tum is seated against the barrel at 13’.
extending around its periphery, while its lower portion
Upon further inward movement of said members 18, y15
is formed with the blind hole or aperture 31. Carried
and 29, the ball 32, which is now lifted out of contact
within said race 30 is the ball 32 which is retained be
between the lower teeth 27, moves into contact with a
tween the side walls of >said race, but is freely rotatably
tapered side 28" of an upper tooth 28. The ball 32 then
around said race. Thus, the ball can move around the 20 moves upwardly along said side 28” until it contacts a
race, but is never completely free of the member 29.
vertical side 28’. Next, as the instrument is lifted up
In assembling, the ball 32 is forced into the race 30 so
ward from the rigid surface, the ball 32 drops from
that its center point is within the race. T'he inner end
contact with upper teeth 28 and `again comes into engage'
of the cartridge 15 is iixed, `as by frictional engagement
Vment with one of the tapered edges 27” along which it
within the lblind hole 31 seating against the inner wall 25 moves until it again drops into-engagement within a deep
33 of said member 29. A compression coil spring 34
recess 26, thereby assuming again the position of FIG
URE 1.
encircling said cartridge 15 and extending over the lower
portion of the member 29, has one end seated against
The above described lsequence of steps is illustrated
the lower edge of the member 24 and the other end
diagrammatically in FIGURE 6. Here the latching`
’seated against a washer 35 atop the ñange 16. A sec 30 mechanism has been developed into a single plane and
V0nd compression coil spring 36, encircling a lower por
the small circles with the ladjacent numerals represent
tion of s'ai'd cartridge 15 is retained between the washer
the location of the ball 32 at various stages of the cycle
35 abutting the lower 'side of the vilange 16 and the top
with relation to the latching members 24 and 25. In
Yend of the hood 14. The inner end of
cartridge 15’
order to simplify the diagram and to make it more clear,
extends into the nipple 23 and seats against the closed 35 -it is assumed for purposes of illustration only that ‘the
Aend 22 of the sleeve member 21. A second compression
-members 2,4 and 25 are vstationary while only the ball
spring 36’ is disposed around .a portion of the cartridge
32 moves. However, in fact, the ball moves longitudi
15’ and between Va washer 35 atop the ilange 16' and
nally and said members 24 and 25 move longitudinally,
the inner end of the hood 14’.
although the impor-tant point is their relative movement.
FIGURE 1 shows >the writing instrument with both 40 Also the ball can rotate while said members 24 and 25
points 18 and 18’ exposed for writing. ~ It will be noted
that the ball 32 is resting on the bottom edge of one of
do not rotate, or said members 24 `and 25 can rotate
while said ball does not. Again it is only important
“the deep slots 26 into Ywhich it also extends A(see FIG
Ythat the ball rotate (í.e. moves around the longitudinal
URE 4). When the lower end of the writing instrument
axis of the instrument) relative to the members 24 and
-is pressed down against >a rigid surface 37, Yiirst the point 45 y25.
Initially, when the point 18 is extended, the `ball '
18, and then the hood 14, are forced ¿inwardly into `‘the
32 will be at position 1 within a deep slot or recess 26.
:barrel against the pressures of the spring 34. It will
When the »writing instrument is pressed downwardly
be noted that’the upper cartridge 15’ land its point 18’
against a hard surface, the ball is moved upwardly out
as -well as the sleeve 21, remain in'their original position.
of its recess 26 to position’Z where it engages the tapered
This is because the cartridge 15’ cannot be forced any 50 »edge 28” of a tooth 2.8. As the ball is moved further
further upwardly due to engagement of its shoulder 19'
upward, it slides along said tapered Vedge 28" to posi
>against the inner annular lip 20' formed in the hood
tion 3 where it is stopped by -a vertical edge 28’. It
member 14', since said hood member 14’ has an annular
will be noted that now the ball is above a tapered edge
.lip or flange seating against the adjacent lip 13’ formed
fin the upper barrel section 10'. As the ylower cartridge 55 27" of a lower tooth 27. Then as pressure is released,
the ball drops down into engagement with a tapered edge
=15 is'forced inwardly, >it carried upwardly the member
‘27" (position 4), moving `downward along said ‘edge
29 to which it is ñXed. At the same time, the ball 32
until it reaches position 5, at which point both ballpoints
is moved up and out of the deep slot 26 and into contact
18 and 18’ will be in a retracted position. As the
with a tapered edge 28" of one of the teeth 28. The
ball 32 then 'slides 'upwardly along said edge 28”`until
kit reaches the lvertical edge 28’ of the -next tooth as illus
trated in FIGURE 2. Then as the instrument is lifted
from the rigid surface 37, the member 29 and the ball
32 Ybegin to move downwardly as the spring 34 urges
the cartridge A15, along with its fixed member 29, down
ward relative to the sleeve 21. The yball 32 thus moves
out of contact with the upper teeth 28 and soon cornes
into contact with a tapered edge 27" of a lower tooth 27. '
writing ball 18 is extended to writing position by sub
sequent pressing 'against a rigid surface, the ball 32 is
Alifted Vto position 6 where it again engages ya tapered
Vedge 28” of an upper tooth 28, rolls upwardly to posi
tion 7, next drops to position 8 as the instrument is
lifted from engagement with said surface, rolls to posi
>tion 9, and lîually drops to position l', vat which `point
both ballpoints 18 and 1'8' are again extended and the
cycle is completed.
While the above illustration has been rnade by actuat
The ball 32 then rolls or slides downwardly along said
tapered edge 27"V Vuntil stopped by a vertical edge 27’. 70 ing the lower end of the instrument, í.e. >.by pressing on
`the ballpoint 18, similar results are obtained by pressing
The sleeve member 29 is now in a retracted or shortened
position with relationship to th'e -’sleeve 21. Meanwhile,
`a new balance of the opposing springs 36 and 36’ is
eifected so that the sleeve member 21 is in a lower posi
'tion within the-casing as shown >in FIGURE 3. At -the
the upper end of the instrument, í.e. point .18', against
a rigid surface. In this latter case, the inward move
ment of the point 18’ along with its cartridge 15’ vre
sults in forcing the `sleeve 2'1, along with ’its ñxed :latch
members '24 and 25, downward. At the same time, the
longitudinal position of the ball 32 Within the barrel
is maintained stationary. Next, one of the teeth 28
cornes into contact with the ball 32. Upon further
downward movement of the teeth 28, the ball 32 is `’forced
along a tapered edge 28” until it reaches a vertical edge
2S’. Then, as pressure is released on the ballpoint 18',
i.e. by lifting the instrument free from a rigid surface,
the sleeve 21 begins to return »towards its original po
46. It will be noted that the ears 49 carried by said
sleeve -46 vare resting on the bottom edge of the deep
slots 43, so that the sleeve 46 is extended. The action
of the spring 52, bearing upwardly against the cartridge,
maintains the point 18 Within the hood 46. When the
writing instrument is pressed down against a rigid surface
37, iirst the sleeve 46 and then the point 18 along with
its cartridge 50 are forced inwardly against the pressure
of the spring 55. As the sleeve 46 moves inwardly into
34. In doing so, the lower teeth 27 will now engage 10 the barrel, the ears 49 are lifted upwardly out of the
deep slots Y43. At the isame time, the cartridge 50 moves
the ball 32 so that once again the instrument resumes
spring 55 upwardly. Meanwhile, the ears 49 come
the position of FIGURE 3 wherein the ball 32 is en
into contact with the tapered edges 45" of the .teeth 45 of
sition under the inñuence of the relatively strong spring
gaged between two adjacent teeth 27. A subsequent
the member 42. The ears 49 then slide upwardly along
pressing of the point 18’ against a rigid surface will re
said tapered edges until they reach the vertical edges 45’
sult in releasing the ball 32 from its retracted position 15 of the neXt teeth as illustrated in FIGURE 9, thereby
between yteeth 27 and move it once again into a deep
partly rotating the sleeve 46. The entire assembly
slot 26. The preceding sequence is schematically illus
assumes the position of FIGURE 8. Then as the instru
trated in FIGURE 6, assuming the ball is vertically
ment is lifted from the rigid surface 37, the sleeve 46
immovable and that the members 24 and 25 are vertically
begins to return to its outwardly projecting position under
movable. Thus, the vertical movement of the members 20 action of the springs. The ears 49 correspondingly begin
24 and 25 relative to the ball 32, will result in the same
relative position of the ball and said members as indi
to move downward out of contact with the teeth 4S of
the member 42 and soon come into contact with the
cated by the numerals l through i1’ of FIGURE 6i.
tapered edges 44" of the teeth 44. The ears 49 are again
It is thus seen that I have provided a double pointed
partially rotated as they slide downwardly along Vsaid
writing instrument, i.e. one having a writing point at 25 tapered edges 44’ until stopped by the vertical edges
each end of the barrel, which may be readily actuated
44’. The sleeve 46 is now retained in its retracted posi
to either retract or protract both writing points simul
tion. Meanwhile the ballpoint 18 has returned to a pro
taneously into either a writing or a non-writing posi
jecting position under action of the springs as a new bal
tion. In FIGURES 7 to l0, I illustrate another aspect
ance is reached between the springs 52 and 55. The
of my invention. Here latch members 40 and 40' are
whole assembly thus assumes the position shown in
ñXed within the barrel sections seating against the an
FIGURE 9, wherein the vballpoint 18 is exposed for writ
nular inner lips 41 and 41' respectively. Spaced from
ing use as the outer portion of the sleeve 46 is partially
said members 40 and 40’ ‘are latch members 42 and 42’
withdrawn into the barrel.
respectively. All latch members are tubular and can
To extend the outer portion 47 of the sleeve 46 from
- be rigidly held in place by frictional engagement with 35 its retracted position, the instrument is again pressed
the inner wall of the tubular barrel portions. The top
rim of the member 40 is formed with radially spaced
downward against a rigid surface.
oiîset from the upwardly projecting `teeth 44. Slidably
extending through said tubular latch members 41 and
Vthe tapered edges 44” of the lower teeth and slide along
42 is a tubular member 46, whose outer portion 47 is
cesses 43, thereby assuming lagain the position of FIG
The point 18 and
then the sleeve 46 are forced inwardly into the barrel.
deep slots or recesses 43 which are open at their top.
As the ysleeve is forced inwardly, the ears 49 are lifted
,Also formed in said top rim between said deep recesses
out of contact between pairs of the lower teeth 44 and
43, are pairs of upwardly projecting shallow teeth 44, 40 into contact with the tapered sides 4 " of the upper teeth
each having a vertical edge 44’ and a tapered edge 44".
45. The ears 49 are again partially rotated as they slide
The lower rim of the upper member 42 is also notched
upwardly along the sides 4S" until they contact vertical
to form the downwardly projecting radially spaced teeth
sides 45'. Then as the instrument is lifted upward from
45, each having a vertical edge 45’ and a tapered edge
the rigid surface, the ears 49 drop from contact with the
45". Said downwardly projecting teeth 45 are radially
upper teeth 45 and again come into engagement with
tapered inwardly and is formed with the interior an
nular lip 48.
The member 46 serves as a hood or pro
tector for the ballpoint.
A series of spaced ears 49 eX
said edges 44 until said ears 49 drop into the deep re
URE 7.
It will be »apparent that the above described sequence
of steps is quite similar to that illustrated diagrammatical
tend outwardly from an intermediate portion of said
member 46, said ears having tapered top and bottom
ly in FIGURE 6 with the exception that an ear 49 re
places the ball 32, `and that said ear is carried by a hood
edges adapted for engagement with the toothed and 55 so that the hood moves into 'and out of a retracted posi
slotted portions of the latch members 41 and 42.
A point and cartridge unit 50 is mounted in said barrel
for reciprocal longitudinal movement and is formed with
«the ñange or flattened portion 51. The lower or outer
end of the cartridge 50 is slidable within the sleeve 46.
tion -to thereby expose or conceal the writing point. .It
will be clear that the upper end of the barrel with its
ballpoint 18’ will work in a similar manner to either
retract or protract the hood 46’. Also it is seen that this
embodiment provides for independent action of the two
A relatively weak coil compression spring 52, surround 60 points, whereas the embodiment of FIGURES 1 to 6
ing a portion of said cartridge 50, has one end seating
provided for the simultaneous actuation of both writing
points upon the inward movement of either- point from
against the washer 53 bearing against the underside of
the ñange 51, While the other end of said spring seats
either a retracted or protracted position.
While the preceding illustrates one form of my in
upon a washer 53 loosely carried atop the inner end of 65
vention, it will be understood that many variations are
said sleeve member 46. The upper portion of the in
possible without departing from the `scope of the inven
strument is formed with a similar mechanism which is
tion. For example, rather than being a separate piece,
indicated by the use of prime marks to indicate similar
the latch element 25 may be readily molded integral with
parts but which are in a different position. Relatively
strong coil springs 55 and 55’ surrounding a portion of 70 the sleeve 21. It would also be apparent that the latch
members 24 and 25 can be mounted and carried by the
the respective cartridges 50 .and 50’ seat against the
member 29, while the ball 32, or an equivalent latch
washers 54 and 54’ which bear against the respective
element such as an ear, can be carried by the sleeve 21.
flanges 51 and 51', and the threaded tubular connector 56.
Another apparent variation is that the ball A32 could be
FIGURE 7 shows the writing instrument with the ball
point 18 shielded by the outer portion 47 of the sleeve 75 retained between the race 30 and the inner wall of the
tubular member 21 rather than partly enclosing said ball
said latch means and’said Ylatch receiving means engaging
'Within the confines of said -race as shown in FIGURE 5.
said lower writing unit and being longitudinally movable
3. A Lwriting instrument according to claim 2, wherein
Still Aanother variation is that the hoods may be Ícon
:structed of rubber or a similar flexible material which is
fixed to the casing. Then, »as the hood is pressed against
said latch receiving means deiines a deep recess and a
'shallow recess, Yand said latch vmeans defines a projecting
'a rigid surface it will tend to bow out as the writing
point moves inwardly. When pressure i-s released, the
ñexible hood resumes its original shape, appearing `as a
`mere extension of the barrel. Another possible variation
is the elimination of the tubular connector 56 of the em
bodiment of FIGURES 7 to 10 and joining the individual
member engageable with said latch receiving means with
in said recesses, said projecting member when within said
`deep recess being Aoperable to obtain said point extended
position, said projecting member when within said shallow
recess being operable to obtain said point retracted posi
>springs 55 and 55' into aV single unitary spring extending
between the washers 54 and 54’.
4. A writing instrument according to claim 3, wherein
Another variation is shown in FIGURE ll. Y Here the
Asaid latching means assembly also includes means for al
member 29' is elongated and formed with an integral 15 ternately directing said projecting member into said deep
flange 58 so that the spring 34 bears against the bottom
recess and said shallow recess upon each of said se
of the member 24 and the top of said ñangre 58. The
ñange 58 seats against the flange 16 of the cartridge. ïln
-5. A writing instrument comprising »a «barrel having
this variation, the cartridge 15 can y-be loosely held within
upper and lower ends; a lower writing unit longitudinally
vthe ‘bore 31' rather than relying upon 'Írictional `engage 20 movable within said barrel and including a lower writing
ment of said Ícartridge 15 »and said Amember 29’ as was
-desoribed in the embodiment of FIGURES l to 6. Thus,
the spring 34 directly urges apart the lower end of lthe
member 29’ and the sleeve 21. These and numerous other
variations within the scope of this invention are possible. 25
I claim:
l. A writing instrument comprising a barrel having
‘lower `and upper open ends; a lower writing unit mounted
‘within said barrel including a lower writing point; yan
point; a lower hood carried by said barrel having a lower
'end normally extending past the lower-end of said barrel,
said lower end of said lower hood being longitudinally
'movable relative to said barrel; a lirst spring urging Asaid '
.lower writing unit inwardly relative to said barrel; lan
.upper writing unit longitudinally movable within said
»barrel and including an upper writing point; an upper
hood carried by said barrel having an upper end normally
extending past the upper end of said barrel, said upper
:end of said upper Ahood being longitudinally movable
relative to said barrel; Aa second spring urging said upper
writing unit inwardly relative to said barrel; a ltubular
the lower Vend of'said barrel, said lower outer'end being
member conjointly longitudinally movable withsaid upper
longitudinally movable relative to said lower end 'of‘said
cartridge unit including a first set of teeth delining a deep
barrel; an upper hood carried by said barrel -having an 35 longitudinally extending recess :and a shallow longitudinal
upperouter end normally extending past the upper end of
-ly extending'recess; a projecting member conjointly longi
said barrel, said upper end being Vlongitudinally movable
tudinally movable with said lower writing unit; and
relative to said upper end of said barrel; resilient Vmeans
toothed means carried by one of said units for alternating
urging said writing units outwardly relative `to said barrel
ly Ashifting/said vprojectin g .member back `and rforthibetween
Vtowards an extended position whereby their respective 40 positions within said Adeep and shallow-recesses upon rela
writing points extend through the outer ends of said hoods;
tive longitudinal movement'of said tubular member and
'and a single latching means assembly `deiining >a point
said projecting member; a third spring urgingsaid tubular
retracted position and a point `extended position, A‘said
member upwardly and said projecting member down
latching means assembly beingjin engagement with both
wardly -to thereby urge .both «of vsaid writing units out
kof said upper and lower writingunits, said latching-means 45 wardly relative to said barrel .against the k'pressures «of
assembly being shifted back and forth between said posi
said ñrst and >second springs; said relative longitudinal
l'tions in response to `longitudinal 'movements of said lower
movement of said members being obtainable .by pressing
vwriting unit obtained Aby successive sequences of pressing
said lower writing point and said lower end of said lower
said lower writing'point and said lower outer end of said
hood into contact with >a rigid surface and then releasing
upper writing unit mounted vwithin said barrel ‘including
‘an upper writing point; a lower hood carried by said
'barrel having a lower outer end >normally extending past
lower hood into contact with a rigid surface to force said 50 from said contact, said relative longitudinal movement of
îlower writing point and said lower hood outer >end in
wardly relative to said barrel against the pressure ofY said
resilient means -and then releasing said lower writing point
said members also being obtainable by pressing said up
per writing point :and said upper-end of said upper hood
into contact with a rigid surface and ythen releasing from
'and "said lower -hood outer end from said contact, said
said contact, said lprojecting member when wiLhin said
latching means assembly also being shifted ‘back and forth 55 shallow recess being operable to simultaneously conceal
-between said positions in response to >longitudinal move
said upper vwriting point within said upper hood fand to ~
ments 'of said upper >writing unit obtained by `successive
conceal said lower writing point within said lower hood,
sequences 'of pressing said upper writing 'pointand said
said ,projecting member when within said shallow recess
upper outer end of said upper 'hood .into contact with a
being operable to simultaneously expose said upper writ
rigid 'surface to force said upper >writing point yand said 60 ing
Y:point outside of said upper hood and to expose said
upper >outer'end of said upper hood ‘inwardlyrelative to
lower writing point outside of said lower hood.
said barrel against'the pressure of said resilient means and
6. A writing instrument according to claim 5, wherein
then releasing said upper writing point and said upper
said ñrst set of teeth are radially spaced, and wherein said
outer end of saidupper hood from said contact, said latch
toothed means include a second set of teeth radially offset
ing means assembly when in said point retracted position 65 from
said first set of teeth.
being operable to ret-ain both of .said writing points in a
5, including
concealed position within‘said hoods, said latching means
assembly when in said point extended >position being op
saidcylindrical member defining an annular groove, and
erable to retain both of said writing points A extended
wherein said projecting member is a ball carried within
through 'the outer ends of said hoods.
2. A writing instrument according to claim 1,'whe'rein
said -latching means assembly includes ya Vlatch'means and
a latch receiving means, one of said latch‘means and'said
latch receiving means engaging -said upper writing `unit
and being vlongitudinally #movable therewith, the other >of 75
said groove.
V8. A writing instrument according to claim 5, including
a cylindrical member carried by said lower cartridge unit, Y
and 4wherein `said Yprojecting member is an ear carrieduby
said cylindrical member.
(References -on following page)
References Cited in the ñie of this patent
8 8,65 5
Great Britain __________ _, Nov. 1, 1887
Germany ____________ __ Sept. 25, 1896 5
Great Britain _________ __ Sept. 15, 1949
Great Britain ................ -_ 1950
Great Britain ________________ __ 1957
Great Britain ________________ __ 1958
Switzerland __________ __ July 15, 1959
Great Britain ________________ „_ 1959
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