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Патент USA US2113437

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April 5, 1938.
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n2,113,437
ERASING ATTACHMENT FOR TYPEWRITERS n
FiledMarCh 25, 1956
26 „..lll
3 Sheets-Sheet 1k
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INVENTOR.
L ol//s> Wu. Nee,
BY
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'
ATTORNEYS
April 5, 1938.
L. WILNER
2,113,437
ERASING ATTACHMENT FOR TYPEWRITERS
Filed March 25, 1936
s. sheets-sheet 2-
ATTORNEYSy
' April s, 1938.
2,113,437
L. WILNER
ERASING ATTACHMENT FOR TYPEWRITERS
.Filed March 25, 1936
3 Sheets-Sheet 5,
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INVENTOR.
BY
ATTORNEYSÍ
.Patented Apr. 5, 1938
» 2,113,431
?UNITED STATES PATENT oei-fics n
2,113,437
ERASING ATTACHMENT FOR TYPEWBITERS
Louis Wilner, New York, N. Y. n .i
Application March 25, 1938,l Serial No. 70,735
.4 omm- (ci. 1p1-,1an
'I'his invention relates to typewriters and other
v writing machines or adding machines and refers
more particularly to an erasing device for type- .
Figure 4 is a section-along the line l-lfof Fig
ure
3;\
f
»
"
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'
.
„ Figure 5 is a top view ofthe device illustrated
writers.
An object of the present invention is the pro
vision of a simple and eñectively operable mech
in Figure 3 ;
characters, which mechanism may be convenient- `
bar carrying the eraser;
Figure 6 is avperspective view of the vertical
>bar carrying the eraser;
anism for obliterating improperly written typel
Figure 7 is a section through the portion of the
1y incorporated in a typewriting machine of
10 any standard make.
Another object is the provision of a type-`
writing machine having an attachment, through
the use of which errors in typewriting may be
quickly and easily corrected by erasure while
`
'
~
'
Figure 8 is a top/ view of the backk spacing
mechanism;
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"
‘ Figure. 9 is a section along the lineal-3 of
Figures8and10;
'
'
Figure 10 is a side view of
mechanism.
'
the back spacing
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v
IThe typewriter illustrated ~in the drawings is usl
A further object of the present invention is a standard construction. This typewriter is
the provision of an erasing device which con- ’ shown merely by way of example, since 'the eras
stitutes an integral part of the typewriting ma
ing attachment constituting the subject-matter
chine, and which is automatically operable by of the present invention may be used in connec
the depression of a key to move backward the tion with typewriters of any type or- make.
platen carrying the paper and thereupon to move
'I'he illustrated typewriter comprises ay frame
an eraser over the letter or character to be ob
i3 carried by the supports- Il and provided with
the movable carriage i2. ’The platen i3 which
'I'he above and other objects of the present -is movable along with the carriage is mounted
25 invention may be realized through the provision » on brackets I4 and i5 and may be rotated by
of an eraser removably mounted upon a rod and .means of the handle I3. The carriage is pro
pressed by resilient means against the paper car
vided with roller clamps l'l and I3 which press
ried by the platen.
f
the paper against the platen, and with vthe line
The rod is reciprocated in the vertical direc-- >spacer I9. A paper rest 2l constitutes _a part
30 tion by the depression of a key constituting a of the carriage and surrounds the lower por-'
part of the keyboard of the typewriter, the eraser tion of the-platen i3. The carriage IZ'ismov
carried bythe bar being passed over a typed able’along with its support 2| which is guided .
character in the course-of this vertical recipro
by the guide bars 22 rigidly attached to the
15 the paper remains in position on the machine. ~
literated.
.
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i
catory movement and obliterating the same.
35 Preferably, the vertical bar contacts a lever in
the course of its upward movement which- actu
ates the back spacer of the typewriter, so that
before the eraser is brought into contact with
the paper the platen is automatically moved one
40 space backward, thus placing the letter to be
erased directly in the path of the eraser.
-' frame.
The'typewriter ribbon 23'is carried -by the rib
bon spools 2l and 2l which are mounted upon
pivots 26 and 21 carried by the horizontal bars
23 and 23, respectively. ,
_
`
Aplate or guide 33 for the type bars is at
tached to the frame of the typewriter and is'
provided with’a suitable slot 3i through which
'I'he invention will appear more clearly from ' the type' carried by a type bar 33 strikes the rib- '
' the following detailed description when taken bon 23 situated in front of the paperi-not shown)
in connection with the accompanying drawings,
45 showing, by way of example, a preferred embodi
ment of the inventive idea.
In the drawings;
Figure l shows in front elevation a typewriter
50
provided with erasing device;
l
Figure 2 is a section along the line 2--2 of
Figure l, with parts broken oiî.
` `
Figure 3 is a front elevation of the erasing at
tachment on a larger scale with some ,parts
broken away;
and the platen I 3.
'
'
Afmovable ribbon carrier 32 is situated be
tween the platen I3 and the guide 30. The de
vice which moves the ribbon carrier 32 upward
so that it is situated in the path of the type
when the latter passes through the' slot 3| is
not shown in the drawings and is 'of standard >
make. This device moves the ribbon 23 upward
as soon as the operator depresses one of the
keys, so that by the time the type reaches the
slot 3| the ribbon is situated Vbetween the type
and the papercovering the platen i3, so that r
2
9,118,487
the type leaves the impression of the ink carried
by the ribbon'23 upon the paper.
The typewriter is provided with typing keys
33 carried by the ends of the key levers 34.
The key lever 34a (Figure 2) is provided with
an ear 33 and is pivotally mounted upon a rod
33.
'I'he opposite end of the key lever 34a is
connected with a link 31 which is attached to a
type bar 33 carrying the type 33 and pivotally
10 mounted upon the pivot 43. Other key levers 34
are similarly constructed.
.
l
In the normal inoperative position shown in
Figure 2 of the drawings the type bars 33 rest
upon a _support 4| which is rigidly connected with
15 the frame I3, while the key bars 34 rest upon
ythe rod 42 which is also firmly connected with
the frame I3.
‘
When the key 33a is depressed by the operator.
the key bar 34a swings around its pivot 33 so
20 that the link 31 pushes upward the type bar 33
and thereby moves the type 33 into the slot 3|
of the guide plate 33.- At the same time the rib
bon supporting device 32 is moved upward so that
the type 33 strikes the ribbon 23 and leaves an
25 impression upon a sheet of paper which covers
is pivotally connected at 33 with an ear 33 con-stituting a part of a vertical eraser bar 33. The
bar 33 extends between the vertical portion I 3a
of the frame I3 and the support 3| carrying the
shaft 40 upón which the type bars 33 are rotat
ably mounted.
The vertical bar 33 is provided with a diagonal
ly bent portion 33a and an upper vertical por
tion 33h extending between the platen |3 and
the guide plate 33 at a short distance from the 10
movable ribbon support 32.
The upper end ofthe rod 33 is illustrated on
a larger scale in Figures 6 and 7 of the drawings;
this end is bifurcated and comprises two substan
tially flat prongs 32 and 33 separated by a vertical
slot 34 and interconnected by the eraser casing
33 which is of trapezoidal form in cross-section,
asl shown in Figure 7. An eraser 33 is situated
in the casing 33 and may be held therein by fric
tion or by any suitable stop not shown in the
drawings. The eraser 33 may be of any standard
make and is provided with an operative surface
31 which projects beyond the Vprongs 32 and 33
and which is passed over the surface of the paper
by the actuation of the key 33 to erase a typed
character. Any suitable abrasive may be used
to provide the surface 31.
'I‘he eraser 33 may be conveniently removed
from its casing 33 and replaced by a new one,
whenever necessary.
As shown more clearly in Figure 3, the eraser
the platen I3. Thereupon the carriage I2 and
the platen I3 supported >thereby are moved one
space to the left (looking in the direction of
Figure 1) by the mechanism of the usual type
30 which is not shown in the drawings. Finally, the
type bar 33 and the key bar 34a are moved back
to their original positions illustrated in Figure 2 . is pressed against the platen I3 and the paper
by resilient means not shown in the drawings. covering the same by two leaf springs 33 and 33.
The back space key 42a is carried by one end 'I'he leaf spring 33 presses against the prong 32
35 of >a horizontal lever 43 which extends to the
while the leaf spring .33 is pressed against the
rear of the can'iage and which is pivoted at 33 prong 33. 'I'he leaf spring 33 is carried by a ver
(Figure l0). The rear end 3| of the lever 43 tical support 13, the lower end of which is firmly
is in engagement with an arm 32 (Figure 9) ` connected with the guide 33. Similarly, the leaf
pivoted at 33 and having a projection 34 which spring 33 is carried by a support 1| which is also
engages a slanting surfaces 33 (Figure 8) of the attached to the guide 33. 'I‘he eraser casing 33
lever 44. The lever 44 is provided with a hook is guided by the leaf springs 33 and 39 during
43 and has a slot 43 through which passes the its movement.
,
pivot 41. The depression of the back space lever
The leaf springs 33 and 33 press the prongs 32
43 is transmitted by the projection 34 of the arm and 33 against the platen I3 in all positions of
32 to the surface 33 of the lever 44, the hook
the eraser bar 33. However, in the inoperative
shaped end 43 of which is brought into engage
position of the device the eraser 33 carried by the
ment with a rack 43 carried by the movable casing 33 is‘situated below the springs 33 and 33
carriage I2 which supports the platen I3 (Figures so that the type 33 can pass conveniently through
2 and 4). The mechanism actuatingthe lever the slot 3| formed in the guide plate 33 and
44 causes the hook to carry out an oscillatory through the slot 34 provided between the bifur
movement, in the course of which the carriage cated ends 32 and 33 of the eraser bar 33, thus
and the platen I3 are moved one space to the reaching the ribbon 23 and making an impression
right (looking in the direction of `Figure l). At upon the paper covering the platen I3.
the end of this movement the hook 43 is in en~
The eraser attachment is operated in the fol
55 gagement with an adjacent tooth of the rack 43.
lowing manner.
The above-described typewriter is of the stand
When the part of the paper provided with the
ard type and does not constitute a part of the
letter
or the character to be erased is situated
present invention.
opposite the slot 3| the eraser is actuated merely
In accordance with the presentinvention, the by
pressing upon the key 33. Then the key bar
60 typewriter comprises an erasing attachment
3|
swingsruponits
pivot l34 so that the vertical
which constitutes an integral part ofthe type
`writer, and which is actuated by the depression
of the key 33 shown in Figures 1 and 2. 'I'he key
33 is attachedto thevertically bent end of a
65 substantially horizontal key bar 3| provided with
a curved middle portion 32 which extends over
the support 42. The key bar 3| is provided with
an ear 33 extending from the upper side thereof.
A pivot 34 passes through the ear 33 so that the
70 key bar 3| is oscillatable around the lpivot 34.
A second smaller ear 33 is situated on the 'oppo
site lower side of the key bar 3| and carries one
end of the coil spring- 33, the opposite end of
which’ is attached at 31 to the frame I3 of the
75 typewriter. The opposite end of the key bar 3|
rod 33 which isconnected by the pivot 33 with the
bar 3|, is moved upward, thereby extending the
spring 33. 'I'he eraser 33 carried by the upper
vertical end of the rod 33 is moved along with the
rod and the operative surface 31 of the eraser is
passed over the letter or the character to be
erased. The pressure of the eraser 33 against
the paper is sumcient to erase the character,
since such pressure is caused by the substantially
strong leaf springs 33 and 33 which press against 70
the prongs 32 and 33 of the vertical bar 33.
After the upward movement of the bar 33 has
been completed, the spring 33 pulls the key bar
3| back into the position shown in Figure 2, so 75
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3
anexa?
that the eraser l. moves once again over the letter
tion of the typewriter and requires merely the
or character to be erased.
addition oi' one key'upon the keyboard.
.
In most instances the letter or character is
erased completely after the key Il! has been de
pressed once. It is possible, however, to repeat
this operation several times, provided that prior
10
15
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20
_
Furthermore, in‘y accordance with the present
invention, the necessity of moving the carriage
by hand one spaceback prior to the erasing may
be eliminated, since the movement of the eraser
to each actuation of the key 5l, the letter or > bar may automatically vactuate the back spacerÍ
character to be erased is placed in front ofthe mechanism and r>move the carriage one space
backward before the eraser is‘brought into contact
slots 3| and 64.
y
The carriage I2 and the platen I3 move auto
with the letter or character to be erased.
matically one space forward immediately after a
letter or character has been imprinted upon the
l. In a typewriting machine having a frame,
paper by one of the type levers Il. If _at that means movable relativelyvto said frame and sup
time the operator nnds that an error has been porting a sheet of paper, a plurality oi types and
made, the operator has to strike by hand the back means causingsaidtypesto carry out a striking 15
space key 42a in order to bring the incorrectly movement against the lint-mentioned means to
typed character in front of the slot 3|. Then the print a characterupon said sheet, the path of
operator strikes the eraser key Il and thereby movement of the types adjacent the first-men
erases the incorrectly typed character.
tioned means being the same for all types in rela
In accordance with the present invention, this tion to said frame; an eraser support having two
necessity of operating the back space lever 43 prongs at one of the ends thereof, a space being
prior to the erasing may be eliminated through formed between said prongs which is situated in
the provision of a device which automatically said path in the inoperative position of said sup
moves the carriage I2 one space back after the port, and an eraser casing adapted to contain an
eraser key 5l) has been actuated and before the eraser and connected with said prongs, said eraser
eraser 66 moves in front of the slot 3|.
This device for automatically moving back
ward the carriage I2 at the time the eraser key il
is actuated is illustrated in Figures 3, 4, 5, and 8
30 of the drawings, and comprises a lever 'Il having
a horizontal portion 10a extending at right angles
to the central axis of the platen Il, a vertical por
tion 10b, another horizontal portion 10c, and a
bent end lia which is situated adjacent the por
tion 60D of the vertical bar 6B. 'I‘he lever 'l0 ex
tends to the back of the carriage and is movable
around a pivot ‘I2 carried by support 1I which isñrmly connected with the frame of the typewriter.
As shown in Figures 5 and 8, the lever 1I is pro
vided with a slot 14 through which a pin 18 is
passed which is carried by the lever Il. «
The lever 10 is actuated by a projection ‘It (Fig
ure 3) which is carried by the eraser bar $0, or
casing being situated outside of said path in said
inoperative position of the support; means carried
by said frame and engaging at least one of said
prongs, the last-mentioned means being adapted
to press the eraser contained in said’eraser css
ing against the sheet of paper, means connected
with said eraser support to move the same out oi'
its inoperative position, whereby said eraser cas
ing is moved into said path to cause the eraser
to erase an incorrectly typed character, and $5
means connected with the last-mentioned means
to move said eraser support back into its inoper
ative position.
'
2. In a typewriter machine having a frame,
means movable relatively to said frame and sup
porting a sheet of paper, a plurality of types and
means causing said types to carry out a striking
movement against the first-mentioned means to
may constitute an integral part thereof, and which' print a character upon said sheet, thev path`of
is provided with an inclined surface 11. 'I'he movement of the types adjacent the nrst-men
surface 11 engages the end 1|a of the lever ‘I0 tioned means being the same for all types in re
i as the bar 60 is moved upwardly in the direction lation to said frame; a vertical eraser support
of the arrow 18, thereby causing the lever 'I0 to having two prongs at the upper end thereof, a
turn around its pivot 12. Since the pin 'I5 con
space being formed between said prongs which
50 nects the lever 1I! with the lever Il, the move
is situated in said path in the inoperative posi
ment of the lever 'I0 is transmitted to the lever tion of said support, and an eraser casing adapt
44 which is provided with a projection 90 engaging ed to contain an eraser and connected with said
an inclined surface 9|. The projection 90 will prongs, said eraser casing being situated below
slide along the surface 8| causing the hook l5 of said path in said inoperative position oi' the sup
the lever M to engage a tooth of the rack 48 and port, a spring engaging one of said prongs and
to move the carriage one space backward. This adapted to press the eraser contained in said
movement is substantially completed before the eraser casing against the sheet of paper„means
eraser 66 is- moved in front of the slot 3|, so that connected with said eraser support to> move the
the eraser is brought into contact with the letter same upward out- of its inoperative position,
or character to be erased.
»
The projection 'I6 remains in contact with th
lever ‘I0 during substantially the entire movement
of the bar 6D, so that no further movement of the
carriage I2 takes place and no other letters or
characters are smeared by the eraser.
jection 16 is moved out of contact with the lever
'I0 when the bar 60 returns to its original position
shown in Figure 3.
An important advantage of the present inven
70
tion is that the erasing attachment constitutes an
integral part of the typewriter and is operated
by the depression of a key in the same manner in
which the other keys are operated. The attach
ment does not interfere with the usual construc--
whereby said eraser casing is moved into said
path to cause the'eraser to erase an incorrectly
typed character, and means connected with the
last-mentioned means to move said eraser sur.\~-
port downward and' back into its inoperative
position.
'
y3. In a typewriting machine having typing
keys, means supporting a sheet of paper, means
moving the first-mentioned means one space for
ward upon the actuation of each key, and means
for moving` the' mst-mentioned means one space
backward;- a support adapted to carry an eraser,
means connected with said support to move the
same for the purpose oi' causing said eraser to ’
pass over the sheet of paper to obliterate an in
correctly typed character, and means connected 'ß
4
2,113,437
with the third-mentioned means and actuated
by the moving support to cause the third-men
tioned means to move the first-mentioned means
pass over the sheet of paper to obliterate an in
correctly typed character, a lever pivotally
mounted upon said AIrame and yoperatively con
one space backward, whereby the incorrectly f nected with the back rspacing means, said lever
typed character may be `placed in the path o1'l when moved actuating the back spacing means
movement of the eraser.
-
4. In a typewriting machine having a frame, a
plurality of typing keys, means supporting a
sheet of paper, means moving the ñrst-men
tioned means one space forward relatively to said
frame upon the actuation of each key, and back
spacing means for moving the first-mentioned
` means one space backward relatively to said
frame; a support adapted to carry an eraser,v
means connected with said support to move the
same for the purpose of causing said eraser to
to move the' ñrst-mentioned means one space
backward, one end oi’ said lever being situated
adjacent said support, and a projection carried
by said support and engaging said end of the
lever while the support is moving to move said 10
lever and thereby cause the back spacing means
to move the ñrst~mentioned means one space
backward, whereby the incorrectly typed charac
ter may be placed in the path of movement ofthe
eraser.
~
’
15
LOUIS WILNER.
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