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Патент USA US2116285

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4May 3, 1938.
c. H’. SAMPSON
2,116,285
CALCULATING ‘ATTACHMENT FOR TYPEWRITERS
Filed April 5, 1952
4 Sheets-Sheet 1
f7
.1.
INVENTOR
CHmzss/iJmPxu
May 3, 1938.
2,1 16,285
c. H. SAMPSON
CALCULATING ATTACHMENT FOR TYPEWRITERS
Filed April 5, 1932
4 Sheets-Sheet 2
Mb
f
v INVENTOR
CHARLES/7’. .Shrmswv A170
May 3, 19387
2,1 1 6,285
c. H. SAMPSON
CALCULATING ATTACHMENT FOR TYPEWRITERS
Filed April 5, 1952
4 Sheets-Sheet 3
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INVENTOR
(Mme-.5 h.’
mesa/v
May 3, 1938.
2,1 16,285
c. H. SAMPSON
CALCULATING ATTACHMENT FOR TYPEWRIT-ERS
Filed April 5, 1952
4 Sheets-Sheet 4
INYENTOR
CHARLES/i Slnmmv
BY
4170
amaamyaioas'
2,116,285
um'rso STATE S j PATENT OFFICE
2.11am "
,
L
Charles H. Sampson, Rochester, N. 1.
Application April 5, 1982, Serial No. “8,865
8 Claim
(cl. 285-“)
y
This invention comprises a calculating attach
ment for typewritingmachines and has for one
of its objects to provide an attachment embody
ing a calculating mechanism which is complete
5 in itself and ‘can be operated separately and joint
1y with the.typewriting nmchine.
'
Another object of this invention is to so con
struct the attachment and its operating mecha
nism that its operation in combination with a
10 Wwriting machine is not dependent ‘on a pre
determined position of the carriage or any other
part of the typewriting machine.
A further object of the invention is to provide
'a mechanism for the attachment which allows
is the amounts to be recorded and totalized in anyv
desired position on any sheet, letter or bill placed
in the typewriter.
Another object of the invention is to provide
connecting means [between the keys of the type
writing machine and the calculating attachment
which are manually operated to have the type
writer keys operate the calculating mechanism
and are automatically operated to disconnect the
_ typewriter keys from the calculating mechanism
a after each set up or the clearing of the calculating
mechanism.
-,
>
These and other objects of the invention will
become more readily apparent from the detailed
description thereof which .follows reference being
30 had to the accompanying drawings in. which
Figure 1 is a front elevation of a portion of a
conventional form of a standard typewriter with
the calculating attachment mounted thereon,
some of the keys of the typewriter and the corre
35 sponding keys of the calculating attachment be
ing omitted from the figure.
Figure 2 is a vertical sectional view of the cal
culating attachment, the section being taken on
the line 23-21: of Figure 1.
40 Figure 8 is a vertical sectional view of the cal
culating mechanism, the ‘section being taken on
the line 31-31: of Figure 1.
Figure 4 is a rear elevation of the calculating
mechanism.
_ Figure 5' is avertical sectional view of the cal
culating mechanism partly broken away, the sec
tion being taken on the line v‘Isa-5:1‘: of Figure 4.
Figure 6 is a horizontal sectional view of the
calculating mechanism, the section being taken
on the line 6:|:—6:|: of Figure 4.
Figure 'l is a vertical sectional view of the key
operating mechanism of the calculating attach
ment and a dlagrammatlcal sectional view of
55 the typewriter to which it is attached.
Figure 8 is a front elevation of one of the digit
rack bar assemblies.
Figure 9 is a longitudinal sectional view of the
upper portion of the index pin carriage illustrat
ing the friction springs which frictionally hold
the index pins in place in the carriage and lock
them in place therein.
.
In the several figures ofthe drawings like
reference numerals indicate like parts. ,
The calculating attachment forming the sub
ject matter of my present invention is adapted
for use with any make of‘standard typewriter
and when attached thereto transforms the type
writer into a calculating‘ machine adapted for
writing, listing, adding and multiplying without 15
restriction as to how and where the writing and
listing must be done on the sheet in the type
writer.
'
'
.
.
As illustrated in the‘ several figures of the draw
ings, the mechanism of the calculating attach
ment is mounted on a vertical base plate I which
extends across the front of the frame A of the
typewriter where it supports the key operating
mechanism and extends to one side of the type
writer frame A where it supports the calculating 25
mechanism
proper.
.
,
In Figure "I the calculating attachment is illus
trated attached to a portion of a standard type
writer in which A represents the frame thereof,
13 one of the type bars which is connected by
means of a suitable link mechanism D to the key
lever C of one of the numeral keys E. . F repre
sents the platen of the typewriter which is
adapted to turn and travel endways over the
frame and carries the paper sheet or sheets on
which the typewritten matter, as well as the
amounts from the calculating attachment, are
recorded. The typewriter mechanism may be
any one of the well known standard types of type
writers and the attachment of the calculating
mechanism does not in any way affect the opera
' tion of the typewriter.
.
As above pointed out, the mechanism of the
calculating attachment is entirely supported on
the vertical base plate I which, as illustrated in
Figure 1. is fastened to one side of the front face
of the frame A of the typewriter by means of a
screw 2 and to the other side by means of one
or more screws 8. On the base plate are pro
vided the guide lugs or pins 4, 4 which are spaced
vertically to support and guide the horizontal
cam slides I, t, ‘I, I, 9, III, II-, I2, I! and II_. In
addition to the vertically spaced guide lugs or
pins 4, l, horizontally spaced guide lugs or pins l5,
II are provided on the base plate I to guide the
2,116,285
2
vertical cam slides l5, l6 which operate the hori
zontal cam slides and carry at the top the keys
|‘|. Each of the vertical cam slides has a slightly
yielding spring connecting member l3 pivotally
fastened to the bottom thereof and each of these
connecting members has a dog l9 formed there
on which is adapted to engage with the key
levers C as will hereinafter be described. The
dogs l9 are movably attached to the shift bar
10 20 and for this purpose are provided with a slot
2| into which engages the pin 22 carried by the
shift bar 20. The shift bar is mounted to slide
on the vertical base plate I and is supported
thereon by means of the pins 23 and 24 which
15 engage into suitable slots 25 and 26 in the shift
bar so as to support the shift bar on the base
plate I and guide it in a straight line horizontal
movement thereon. The shift bar may be moved
manually in either direction by means of the
20 bell crank lever 21 which is pivotally mounted on
the base plate I at 28 and is provided with a key
29 on the free end thereof. The connection be
tween the bell crank and the shift bar is provided
by a pin 30 which is carried on the shift bar 20
25 and engages into the slot 3| provided in the bell
crank lever 21.
In depressing the key 29, the bell crank lever
is rocked and moves the shift bar 20 to the left
in Figure. 1 carrying with it the pins 22 which
30 swing the spring connecting members IS on the
lower end of the vertical cam slides I6 and move
the dogs I9 thereof behind the vertical portion
of the key levers C.
The vertical portion of each of the key levers
35 C is provided at the rear, with a lug 32 so that
when a numeral key E is depressed after the
dogs I!) have been moved behind the key levers,
as above described, the lug of its key lever en
gages a dog l9 and moves its connecting member
40 is and the vertical cam slide IE, to which the
slide moves a particular horizontal cam slide to
the
right.
'
-
‘
While each cam lug 33 thus moves one of the
horizontal cam slides 5 to i3 inclusive to the right,
the cam lug 34 operates the horizontal cam slide
l4 and moves it to the left on the downward
movement of any one of the vertical cam slides
l6. After one of the vertical cam slides l3 has
been depressed by either its own key I! or the
numeral key E connected thereto, it is returned 10
to its normal position by a spring 38 which has
its center portion wound around a supporting pin
40 so that the free ends thereof can engage under
the pins or lugs 39 of two successive cam slides
and hold these cam slides in their elevated start 15
ing position or move them back into this posi
tion after they have been’ depressed as above
pointed out.
Stop pins or lugs 4|, provided on the
base ‘plate, engage behind the cam lugs 34 and line
up the vertical cam slides in a uniform starting 20
position. The stop lug 36 of each of the vertical
cam slides is suitably spaced from the cam lug
34 and engages the stop pin or lug 4| on the
downward movement of the vertical cam slides in
order to limit their movements to the movement 25
necessary for the operation of the horizontal
cam slides by the cam lugs 33 and 34.
Each of the horizontal cam slides 5 to l3 inclu
sive carries at its outer left hand end a cam 42
as illustrated in Figure 6. These cams operate to
rock the rocking levers 43 which depress the index ,
pins 44 for the setting of the digit rack bars 45
as will hereinafter be described. The horizontal
cam slides 5 to l3 inclusive each carry a suitable
lug 31 which is yieldingly held in its normal in
operative position against the side of the ver
tical cam slide just below the cam lugs 33 there
of. Springs 41 and 48 are mounted on the base
plate I and their ends engage either a lug 43
on the horizontal cam slides or the free ends of
depressed by the numeral key. In this way each
of the numeral keys E of the typewriter, when
45 depressed, operates a corresponding vertical cam
one of these bars in order to yieldingly force the
horizontal cam slides to the left in Figure 1- while
their lugs 31 engage the side of the vertical cam
bars below the cam lugs 33. When one of the
vertical cam slides is therefore depressed either
by means of its own key H or a numeral key E of
described, and moves this vertical cam slide
the typewriter, the cam lug 33 thereof forces the
lug 31 to the right in Figure‘ 1 and shifts its
corresponding horizontal cam slide against the
connecting member is attached, during part of
the movement of the key lever which is being
slide IS on the calculating attachment when the
shift bar 20 has been operated by the key 29
to provide the connection between them, as above
50 downwardly in a vertical movement.
35
pressure of one of the springs 41 or 48‘.
In so
When it is desired to operate the calculating doing the cam 42 at the end of the horizontal cam
mechanism without operating the numeral keys ' slide moves under the end of the rocking lever
of the typewriter in order to make a calculation 43 and rocks this lever on its ?xed vertical pivot
without recording it, key 29 is raised to move the pin 43A so that its opposite end engages one of
the index pins and forces it into the carriage 53 55
55 shift bar to the right and swings the dogs |9 to
the right of the key levers so that they no longer on one side thereof. The opposite end of the
pin thus operated by the rocking lever is forced
are engaged by the lugs 32 thereof. The calcu
lating mechanism, instead of being operated by
the numeral keys of the typewriter, is then op
60 erated by means of the keys |'| which are carried
by the vertical slide bars at the top thereof.
Each of the vertical cam slides I6 is provided
with a .pair of cam lugs 33 and 34 of which
cam lug 33 engages one of the horizontal cam
65 slides 5 to l3 inclusive,'while cam lug 34 passes
thru the cam slots 35 provided in the horizontal
cam slide M. In addition to the cam lugs 33
and 34, each of the vertical cam slides is also
provided with a. stop lug 38. The horizontal cam
70 slides 5 to |3 inclusive are each provided with a
lug 31 which is located on the right hand side
of the vertical cam slides and cooperates with
the cam lugs 33 thereof so that when these cam
slides are moved downwardly, each vertical cam
away from the other side of the carriage and pro
jects into the path of one of the digit rack bars
45 as will hereinafter be described.
In this way each of the nine keys ll of the cal
culating attachment and the nine of the numeral
keys E of the typewriter on which the calculating
attachment is mounted, operate one of the index
pins 44 on the operation thereof.
The index pins 44 are mounted in a sliding
carriage 50 which comprises a pair of vertical
plate members suitably spaced apart, one of.
which is provided at the top with a projection
5| which is guided by a suitable guide member 70
52 located above the carriage 50 as illustrated in
Figures 1 and 3. This same vertical plate mem
ber of the carriage 50 is provided near the bot
tom with lugs 53 and 54 thru which passes the
guide bar 55. In this way‘ the carriage 53 with 75
2,116,985
itsindex pins 44 is supported to slide back and
forth in the guide member 52 at the top and on
the guide bar Bl at the bottom.
‘
Movement is imparted to the carriage II by
means of the spring ‘I. This spring is anchored
with one end to the bracket 51 and with its other
end to the lever arm II which is keyed to the rock
shaft IO. The upper end of the lever arm is con
nected to the outer end of the index pin carriage
10 by means of the link OI. In order to provide a
. step by step movement for the carriage and a1
low the carriage to move only when one of the
keys is operated, an escapement is provided
which is operated on the operation of each of
16 the keys.
This escapement is operated by the
horizontal cam slide is and each of the vertical
cam slides pass thru a cam slot II as heretofore
pointed out so that on the downward movement
of each of the vertical cam slides the horizontal
cam slide it is moved to the left in Figure l.
v The horizontal cam slide carries a cam II’ which,
when shifted to the left in Figure l, depresses the
arm I! and rocks the shaft ‘N. This in turn
swings the arm 04 carried on the shaft is so that
the dog Bl thereof engages into one of the slots
0. provided in the escapement‘bar ll while the
dog ll moves out of this same slot and permits
the carriage to be drawn to the left by the spring
I‘ until the end of the slot into which the dog
3
II on which they are keyed for a purpose that will
presently appear.
-
>
.
The carriage ‘II is provided with suitable side
members I! and 03 (see Figures 3 and 6) and in
each of these side members is provided an elon
gated slot 84 between which the supporting bar
II is suspended by means of two suspension
springs I6 and II. The bar 85 supports the lower
bifurcated ends of the slides 09 which carry at
their tops, lugs ll between which and the fixed 10
lugs II are stretched the springs 02 as shown in
Figure 3, one for each of the nine slides 80.
These springs hold the slides 89 yieldingly against
the supporting bar It and move with this bar
when it is moved by the operation of the operat 15
ing lever 12. Each of the digit rack bars ll is
mounted on one side of one of the slides 80 as il
lustrated in Figures 3 and 8. For this purpose
each .digit rack bar II is provided with a pair of
rearwardly extending extensions II and M which 20
are provided with the slots 98 and 0' respectively
and into these slots engage ‘the pins l1 and II
respectively to guide and hold the digit bars or
racks ll in a short straight line movement on the
slides 89. A spring 80 is stretched between the
lug ll. provided on the rearward extension '4 of
each digit bar orrack {I and a pin lill carried by
the slide I! on which this digit bar or rack is
has been engaged has reached the dog ll. When
the key which has been depremed is released, the
mounted. In this way each digit bar or rack ‘I
has a predetermined lost motion on its slide 80.
When the carriage ‘It is pulled down on the op~
horizontal cam slide moves back so that the cam
eration of the lever 12 it does not disturb the posi- '
‘I allows the arm 02 to rock upwardly and raise
the arm 84 so that the dog It disengages itself
from the slot in the escapement bar 01 while the
dog Cl engages into the succeeding slot 0' and
allows the carriage to be drawn another short dis
tance until the end of the next slot reaches the
dog ‘I and is arrested thereby. Every time one
of the keys is depressed, the carriage is thus al
lowedto move a distance equal to the distance be
tween two consecutive index pins ll so that the
operation of the next key will engage an index
pin located in the succeeding vertical line of index
pins in the carriage N.
a
The index pins have part of their intermediate
body portion reduced in diameter and a series of
bow springs ‘III are placed between the upright
plate members of the carriage BI and encircle in
a serpentine path the reduced sections of the
horizontal lines of consecutive index pins in or
tion of the supporting shaft ll until the carriage
has been moved a distance equal to the length of
the slots‘ 84 provided in the sides thereof. This
lost motion of the carriage is transmitted to the
shaft ll to operate means for rocking the counter
wheels in and out of mesh with the digit bars or
racks and also for operating locking means which
prevent the operating lever 12 from returning to
its normal starting position unless the lever has
first been given its full predetermined movement.
The latter locking means comprises a mutilated
ratchet wheel II! which is keyed to the end of
the shaft II and cooperates with a spring oper
ated pawl I I! which is pivotally mounted below
this ratchet wheel and is held by the spring I“
to normally project into the mutilated or cut
out portion of the ratchet wheel. When there
fore the shaft is rotated by the movement of the
carriage ‘I. on the downward movement of the
der to make frictional contact therewith to fric- _ handle ",the pawl is swung to’one side and con
tionally hold the index pins in the position into secutively engages between the'ratchet teeth of
which they have been moved by the rocking levers the ratchet wheel to keep it from turning back
ll. These springs also serve as keys which lock unt? a complete revolution of the ratchet wheel
the index pins into the carriage andprevent them has been made and the pawl again projects into 55
from entirely moving out therefrom in'either di
the cut away periphery thereof. When the han
rection.
dle ‘I! is released the spring "A (see Figure 1)
While the index pins have been set up by the draws it back to its starting position and during
keys, the carriage has been moved so that the this later movement the shaft is rotated in the
operated index pins will form stops for the digit opposite direction so that the ratchet wheel
rack bars II on the downward movements there
swings the pawl to the opposite side to consecu
of. Each digit rack bar is adapted to rotate a tively engage between the ratchet teeth to keep
counter- wheel “A with which it is brought into it from turning back until the ratchet wheel has
mesh on its return movement from contact with made a complete revolution in the opposite di
one of the set up index pins. The digit rack bars rection and the pawl again projects into the cut
4| are moved to engage the index pins by the op
awayportion thereof.
.
1
eration of the operating lever ‘I! which is keyed
In its movement to operate the calculating
to the shaft 13. .This shaft carries the arm ‘II mechanism after it has been set up by the keys
at the back of the base plate I as illustrated in thereof or the keys of the typewriter. the operat
Figuretwhichisconnectedbyalink 'llltothe ing lever 12 also throws out the connection be 70
vertical slide carriage II. The carriage carries tween the keys E of the typewriter and the ver- _
two racks-1.1 and "at the back thereof which tical cam slides it. This is accomplished thru
mesh with the pinions ‘I! and .0 respectively
75 and rotate these pinions and with-them the shaft
the extension arm II! which is attached to the
end of the shift bar 20.‘ This extension arm has
4
2,116,286
a shoulder I06 provided on the upper edge there
of and when the shift bar is shifted to the left in
to its starting position and any index pin which
has been set by the keys and projects from back
?gure 1 on the operation of the key 29 to bring
about the connection between the vertical slide
in bars and the typewriter keys E, the shoulder I06
to again project from the frontv of it as the pin
slides past the angular cam surface II8 of the
is moved to the left and located below the cam
I01 while the‘ end of the arm passes thru a suit
able opening in the side wall of the casing (see
Figures 1 and 2). This cam has two cam lugs I08
of the carriage 50 is forced back into the carriage ‘
?xed cam member H9.
For the purpose of locking the latch dog III
out of engagement with the cam lug II3 of the
segmental gear III when it is desired to perform
a multiplication by a repeated addition of the 10
10 and I09. Of these, cam lug I08 normally engages ,
the-outer end of the extension arm I05 and holds‘ same set up, the slide I20, with its outwardly
the shoulder I06 thereof away from the cam lug projecting ?ange I2I, is moved to the left In
Figure 4 to engage and hold the lower end of the
I09 when the handle 12 is in its normal inopera
tive position. As soon as the handle is depressed latch dog away from the cam lug I I3. The latch
the cam lug I08 moves away from the end of the dog is then raised on the return movement of the 15
extension arm and permits it to swing up so that carriage 16 without returning the index pin car
the shoulder I06 thereof will engage behind the riage 50 to its normal starting position and a re
peated operation of the operating lever 12 will
cam lug I09 after the handle 12 has been com
pletely operated. If the shift bar 20 has been cause a repeated addition of the original set up of
20
moved to connect the typewriter keys E with the index pins.
The latch dog is locked out by means of the
the calculating mechanism, the shoulder I06 of
repeat lever I22 which is pivoted at I23 and with
its extension arm is located approximately be
low the vertical center line of the cam I01 so one end projects into a suitable opening in the
that on the return of the handle 12 by the spring slide I20 while the other end projects to the front
12A, the cam lug I09 engages the shoulder I06 of the attachment and has the handle I24 formed 2,5
and forces the extension arm back to the right thereon with which it can be shifted to move the
in Figure 1- and shifts the dogs I! to one side slide either into or out of engagement with the
latch dog. In order to hold the repeat lever in
of the key levers to keep their keys from operat
the repeat or normal position, the front of the
ing the calculating mechanism until the connec
casing thru which the lever projects is provided 30
30 tion has again been made by shifting the shift
with the offset notches I25 and I26 at the ends
bar to the left on the depressionlof the key 29.
For the purpose of keeping the operating lever of the slot I25A in which the lever moves back
from returning the shift lever and breaking the and forth. The end of the lever I22 then en
connection between the typewriter keys and the gages into one of these notches at the end of
35 calculating mechanism, a cam I10 is mounted on each movement to one side or the other.
The digit bars or racks 45 are adapted to op
the inside of the casing surrounding the cal
erate the counter wheels only on their return
culating mechanism. This cam may be manual
ly operated to’rest on the top of the end of the movement after they have been moved down
extension I 05 of the shift bar 20 and hold this against oneof the index pins. For this reason
40 extension so that lug I09 of cam I01 cannot en
45
50
55
60
gage the shoulder I06 and 'move the shift bar
back.
To automatically return the carriage 50 with
its index pins to its starting position in order
to clear the mechanism on the return movement
of the operating lever 12, the shaft 59, on which
the lever arm 58 is mounted, has the segmental
gear IIO keyed thereto at the back of the base
plate I as illustrated in Figure 4. This segmental
gear meshes with the segmental gear III carried
on the shaft H2 and segmental gear IIO rotates
the segmental gear III on the movement of the
lever arm 58 as it shifts the index pin carriage
50. On the periphery of the segmental gear III
is provided a lug which cooperates with the
latch dog H4 carried by the‘ carriage 16 and de
pending therefrom as illustrated in Figure 4. The
latch dog H4 is provided with a slot II5 thru
which passes the pivot pin II6 mounted on the
carriage 16 to support the latch dog thereon. As
the" carriage is pulled down by the operation of
the lever 12, the pivot pin moves down in the slot
II5 until it reaches the end of the slot. A fur
ther downward movement of the carriage to the
65 end of its downward movement by the lever 12
moves the latch dog with it to have its hook
shaped member II1 engage under the cam lug
I53 so that when the latch dog III is raised on
the return movement of the carriage 16, the en
70 gagement of the dog II1 with the lug III of the
segmental gear III will rotate the gear‘ and turn
this gear and the segmental gear II 0 with its
shaft 59 and the lever arm 58 back to its starting
position. The return of the lever arm in this
76 manner moves the index pin carriage 50 back
the counter wheels are mounted to rotate on
the counter shaft I21 .which is suspended by a
pair of arms I28 and I29 from the pivot shaft
I30. The end of the counter shaft I21 is con
nected with the carriage 16 by a combination of
toggle and rocking levers I3I, I32 and I33 which 45
are so arranged that during the first part of the
movement of the carriage before the supporting
shaft 85 is moved by it to allow the digit bars
to move, the toggle lever I33, in moving down
with the carriage, rocks the rocking lever I32 50
which in turn forces the toggle lever I3I to the
right in Figure 2 and swings the counter shaft
I21 with its counters out of mesh with the digit
or rack bars 45. The digit bars are then free to
move down on the downward movement of the 55
carriage 16 until their movement is arrested by
an engagement with one of the index pins 44.
The carriage 16 is ready to return when all of
the digit bars have been moved to their lower
most position'as governed by the set up of the 60
index pins. In this lowermost position and dur
ing the ?rst part of the upward movement, the
spring I35, which connects the two toggle levers
I3I and I 33, draws the counter shaft to the left in
Figure 2 in order to bring the digit rack bars in
mesh with the pinions I36 of the counter wheels
45. The return movement of the digit rack bars
then rotates the counter wheels in accordance to
their movement as governed by the set up of the
index pins.
I
70
For the purpose of clearing the mechanism that
is moving the counterwheels to their starting
position after the sum total has been registered
by them, the clearing bar I31 is slightly shifted
to the right in Figure 1. This clearing bar is an 75
13,110,905
extension of the index pin carriage 50 and in the
_ rear thereof facing the digit‘or rack bars 45 are
provided a series of notches I55. A suitable
opening in the side wall of the housing permits
its end to pass thru the side wall on its move
ment to the left. The notches in the clearing
bar are so arranged that on the starting position
of the index pin carriage 50, they are held out of
line with the digit or rack bars 45 and thus pre
10 vent these bars from moving downwardly. In
order to allow these bars to be moved ‘for the
purpose of turning the counter wheels back to
their normal starting position, the clearing bar
is slightly moved to the right in Figure l by means
of the cam I35 provided on the extension I40
of the toggle lever ISI. This extension I45 pro
jects to the front of the calculating attachment
and has the key “I provided thereon. When
therefore this key is depressed to rock the toggle
link III, the cam I35 engages the end of the
clearing bar and shifts it slightly to the right
in Figure 1 until the notches I55 inthe clearing
bar are in line with the digit or rack bars 45
and permit ‘these bars to be operated without be
ing arrested in their movement by the index pins
on the movement of the operating lever 12. The
‘return movement of the digit or rack bars, after
being uniformly operated, then resets the counter
wheels to their zero position, by means described
30
below.
'
~
The counter wheels are stopped in their zero
position by'the dogs I45 which are carried by the
rock shaft I45. This rock shaft is rocked by the
engagement‘of the dog I41 provided on the ex-’
tension I45 of the toggle lever III with the dog
I45A so that‘ on the depression of the key “I
mounted to swing on the pivot shaft I55 by means
of the arms I53 and I54. A link I55 is attached
to the inside of the resetting bar and connects
this bar to one end of the bell crank I 55.
A
slotted link I51 (see Figure 4) is pivoted to the
other end of the bell crank I55 and into the slot
of this link projects the stud I55 carried by the
carriage 15. The length of the slot in the link I51
is such that on the last portion of the downward
movement of the carriage 15 by the operating 10
lever 12, the stud I55 draws the link I51 with it
and rocks the bell crank I55 which In turn draws
the link I55 to the left in figure 2 and rocks the
resetting bar toward the digit bars so that the
upper portion of any of the latches I45 whichv 15
have been previously swung away from the digit
bars are forced back to have the hook I55 over
hang the top of the digit bar and provide a stop
for it. In the latter position the spring latch
I55 engages the notch I5I to hold the latch yield 20
ingly locked in this position while the resetting
bar I52 is swung back to its starting position.
The index pin carriage "55 has a handle I42
projecting to the front of the calculating attach
ment. This handle is provided with a pointer I45 25
which projects upwardly from the handle and‘
indicates the position of the carriage during its
operation on the column indicator I44. The
handle I42 is provided for the purpose'of “Eras
ing” any amount set up by the keys before the 80
operating handle is operated. This is done by
simply shifting the carriage 55 back to its start
ing position by pushing the handle I42 to the
right in Figure 1.
_
For the purpose of locking the counter wheels 86
in engaged or in disengaged position relative to
the projections provided by the dogs I45 are then‘ the digit or rack bars, the end of the counter
rocked against the periphery of the counter shaft I21 ‘carries the locking arm I52. This arm
wheels and stop the wheels when their lugs I45 projects thru the vertical base plate I. and its
free end is suspended by means of the spring I55
40 provided on the periphery of the counter wheels
make contact therewith.
’
to have the lug I 54 thereof engage into either the 40
' When a counter wheel is rotated more than one
notch I55 or I55 provided in the fixed latch plate
revolution the amount of one revolution of this
counter wheel is carried over to the digit bar of
the next succeeding counter wheel. This is done
by the swinging latches I49 which are mounted
to swing on the pivot shaft I35. Such a latch
is provided for ‘all but the last of'the counter
wheels. The lower ends of the swinging latches
normally rest against the periphery of the coun
ter wheels and when one of them is rotated more
than one revolution, the lug I45 provided on the
periphery of the counter wheel, rocks the latch
and forces the upper end of the latch away from
the upper ends of the digit or rack bar of the
nextsucceedlng counter wheel in order to allow
the digit or rack bar to move up higher during
its return movement and rotate the counter
wheel an extra tenth of a revolution to carry over
and add to this counter wheel the amount of a
I51. 7 The free end of the ‘locking arm overhangs
the locking cam I55 carried on the shaft 5i. This
cam is so positioned on the shaft that the cut
away portion of it is normally located at the top
at the beginning of the movement of the carriage
15. The locking arm I52 is thus free to be drawn
to the right in Figure 3 on the swinging of the
counter shaft to move the counter wheels out of
mesh with the digit rack bars on the ?rst part of 50
the rotation of the shaft 51 and moves the lug
I54 of the locking arm into engagement with the
notch I55 in the latch plate I51. The locking cam
then engages the under side of the locking arm
and holds the lug I54 locked in place in the notch 55
I55 of the latch plate until the shaft 5i and
cam I55 has made a complete revolution during
the downward movement of the carriage 15. A
detent 250 supported on the casing and project
complete revolution of the previous counter ing in close proximity to the periphery of each
wheel.
of the numeral wheels so as to engage the lugs
The upper end of the latches I49 are locked
I45 thereof, serve to align the numeral wheels
away from the top of the digit bars by means of and prevent their rotation when disengaged from
65 the spring latches I50 which engage into the 'the racks. At the end of the revolution of the
notch I5I when the latches are rocked as above shaft and cam, the cut away portion is again
described.
located under the end of the locking arm‘ and
After the next set up of an amount and the this permits the countershaft to be moved to the
operation of the operating lever to move the car.
left to bring the counter wheels in mesh with
riage 15 down previous to the movement of the the digit rack bars for the operation of the
counter wheels by the digit or rack bars, the counter wheels by the digit rack bars on their 70
latches I45 areswung back to their normal posi- ' upward return movement.’ The counter shaft
tion by the horizontal- resetting bar I52. This I21 when it is swung back moves the locking arm
resetting bar is located in front of the upper por
to the left in Figure 5 to have the lug I54 thereof
tion of the latches I45 and is supported and move ‘out of the notch I55 into the notch I55
it;
6
2,116,286
of the latch plate I61. The rotation of the shaft
81 and the cam I68 on the upward return move
ment of the carriage 16, then locks the locking
-arm against the latch plate to hold the counter
wheels locked in mesh with the digit rack bars.
From the foregoing it will be apparent that I
have devised a new and useful calculating at
tachment for typewriterswhich embodies the
features enumerated in the statement of the in
10 vention and the above description and, while I
keys for indexing said calculating mechanism,
connecting means for engaging said type operat
ing keys with said calculating mechanism op»
erating keys to jointly operate said calculating
operating keys with said type operating keys on
the operation of said type operating keys, an
operating lever for said calculating mechanism,
and disconnecting means operated by said op
erating lever of said calculating mechanism for
disconnecting said type operating keys from said 10
have in the present instance shown and de ' calculating mechanism operating keys on the
scribed preferred embodiments thereof which will operation of said calculating mechanism by said
give in practice satisfactory and reliable results, operating lever.
5. A combined typewriting and calculating ma
it is to be understood that these embodiments are
having a movable carriage, a platen carried 15
is susceptible ‘of modi?cation in various particulars chine
without departing from the spirit or the scope of by said carriage and a type operating mechanism
the invention or sacri?cing any of its advantages. cooperating with said carriage, a key board for
The attachment does not impair in any way operating said type operating mechanism and
the operation of the typewriter as such and the carriage, a second key board for indexing said
calculating mechanism, means for supporting said 20
20 recording of the amounts set up on the“ calculat
ing attachment may be done at any point on calculating mechanism key board in a predeter
mined position with relation to said typewriter
the typewriter platen F.
key board and for supporting said calculating
I claim:
1. A combined typewriting and calculating ma? mechanism to one side of said key board and
25 chine having a carriage, a platen carried by said detachable connecting means connecting the keys
of said type operating key board with the keys
carriage and a type operating mechanism co
of said calculating mechanism key board, an
operating with said carriage, a calculating mech
anism, keys for operating said type'operating operating lever for said calculating mechanism
mechanism and carriage, keys for setting up said and means operated by said operating lever of
said calculating mechanism for operating said 30
30 calculating mechanism and connecting means for
connecting said type operating keys with said detachable connecting means to disconnect said
type operating key board from said calculating
calculating mechanism set up keys, to simul
mechanism key board.
taneously operate both said type operating mech
anism and said calculating mechanism on the
35 operation of said type operating keys, an operat
ing lever for registering each set up on said cal
culating mechanism and means operated by said
operating lever to disengage said connecting
means between said type operating keys and
40 calculating mechanism set up keys.
2. In a calculating attachment for typewriters
having numeral keys, the combination of a key
board having substantially vertical key stems, a
registering mechanism, connecting members car
6. The combination with a typewriter having a
series of numeral keys, of a calculating machine
attachment having a keyboard, connecting means
connecting said numeral keys of said typewriter
with said calculating machine keyboard to enable
an operation of said calculating machine key
board by said numeral keys, a calculating mech
anism, and an operating lever for said calculat
ing mechanism, said. connecting means between
said numeral keys and said calculating machine
keyboard being disconnected by the operation of
45
45 ried by said key stems, shifting means for mov
said lever.’
nism, and means moved by said operating lever
50 to operate said shifting means so as to discon
nect said connecting members from said numeral
to typewriters having numeral keys with a
registering mechanism embodied in the calculat
ing attachment the combination of a supporting
member mounted on the front of the typewriter,
a keyboard‘ carriedby said supporting member,
connecting means connecting said keyboard with
said numeral keys and means for operating said
connecting means to disengage said connecting
ing said connecting members into engagement.
with said numeral keys, an operating lever for
causing the operation of said registering mecha
keys.
3. In a calculating attachment for typewriters
having numeral keys, the combination of a key
55 board having substantially vertical key stems
_
_
'7. In a calculating attachment for attachment
means from said numeral keys on the operation
forming cam slides, a registering mechanism, con
of said registering mechanism.
necting members carried by said cam slides,
8. In a combined calculating and typewriting
machine including a registering mechanism the
combination of a keyboard for said typewriting
machine, a keyboard for setting up said register
ing mechanism, said second keyboard being verti
cally in line with the numeral keys of said type
writing machine keyboard, a shifting bar extend
ing from one side of said keyboard to the other
side thereof, keyboard connecting means car
ried by said shift bar, a lever at one end of said
shift bar for moving said shift bar to have said
connecting means connect the keyboard of said
typewriting machine with the keyboard of said
calculating machine, and an operating lever for 70
shifting means for moving said connecting mem
bers into engagement with said numeral keys, an
60 operating lever for causing the operation of said
registering mechanism, an extension arm pivoted
on one end of said shifting meanacam means
carried by said operating lever and adapted to
engage and move said extension arm in one direc
65 tion on the operation of said operating lever so
as to operate said shifting means to disconnect
said connecting means from said numeral keys.
4. A combined typewriting and calculating ma
chine having a movable carriage, a platen car
70 ried by said carriage and a stationary type op
erating mechanism cooperating with said car
riage, a calculatingmechanism, keys for operat
ing said type operating mechanism and carriage,
I
. '
operating said shift par and causing said con
necting means to disconnect said keyboards.
CHARLES H. SAMPSON.
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