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Патент USA US2111349

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March 15, 1938.
w. ARNETT
2,111,349
CALCULATING MACHINE
Filed Aug. 10, 1936
2 Sheets-Sheet l
March 15, 1938. ‘
-
2,111,349
W. ARNETT
CALCULATING MACHINE
Filed Aug. 10, 1936
6,
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2 Sheets-Sheet 2
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2,111,343l
Patented Mar. 15, 1938
UNITED STATES PATENT OFFIQE
2,111,349
CALCULATING MACHINE
Worth Arnett, Birmingham, Ala.
Application August 10, 1936, Serial No. 95,221
1 Claim. (Cl. 235-44)
This invention relates to a calculating machine
and more particularly to an adding or subtract
ing machine of the type comprising a series of
rotary indicating dials or discs adapted to be
5 acted upon by a suitable tool such as a stylus,
pencil or the like to actuate the computing mech
anism.
The principal object of this invention is to pro—
vide between the dials or discs of the calculating
10 machine each carrying a different member ‘scale,
an indicating member provided with a visible por
tion which is brought into view over a dial hav
ing a number scale of one character when an ad
jacent dial having a number scale of a diiferent
15 character is given a complete revolution so as to
indicate to the operator when to “carry” or “bor
row” depending upon whether the machine is op
erated for addition or subtraction.
Another object of this invention is to enable
20 the zero position to be quickly and readily ob
tained in resetting the mechanism and with
practically no mental effort on the part of the
operator.
A further object of this invention relates to the
25 adaptability of the same for use in computations
of varying character wherein the dials may be
formed to read in hours, days, weeks, months and
years; fractions of an inch, inches, feet, yards,
etc. ; or any other number system adaptable for
30 addition or subtraction.
A still further object of this invention relates
to the simple construction of the same which is
of relatively few parts, inexpensive to manufac
ture, which may be made small in size for carry
35 ing in a pocket, and which is accurate and de
pendable in operation.
Other objects of this invention will become ap
parent as the description thereof given hereun
der proceeds with reference to the accompany
40 ing drawings wherein:
Figure 1 is a top plan View of the calculating
machine.
Figure 2 is a plan view of the interior of the
calculating machine with the cover removed.
45
Figure 3 is a transverse sectional view taken on
line 3-3, Figure 1, looking in the direction of
the arrows.
Figure 4 is a plan view of a modi?ed form of
calculating machine.
Figure 5 is a detail sectional view of one end
of the indicating member taken on line 5—5, Fig
casing housing the computing mechanism which
comprises see Figure 3, a base H, a spacer l2
and a cover l3; made of any suitable rigid mate
rial such as sheet metal, ?bre, cardboard, Bake
lite, etc. The spacer I2 is of the same outside
dimensions as the base H and is in the form of
a gasket having long sides l4 and I5, and short
sides if: and H, as clearly shown in Figure 2,
and de?nes a walled recess.
Arranged in a row on the base H and sym
metrically spaced from the sides of the spacer
52 are a plurality of rotatable number dials 2i},
2%, 22 and 23, each ?tted on a sleeve 21% cen
tered by an internally threaded pin 25 project
ing upwardly through the base II. The sleeves
‘24 are preferably made of a length exceeding
the thickness of the dials 20, 2i, 22 and 23 so as
to project slightly above the same for a purpose
to be hereinafter described. As the construction
of the parts for each dial is identical, a descrip— 20
tion of the same with reference to the dial 29
shown in section in Figure 3 will be given.
Mounted on the projecting fall of the sleeve 24
is a stationary number dial 26c having a di
ameter less than the diameter of the dial “iii, 25
both said dials being co-axially arranged. The
dial 28a is securely clamped to the sleeve 26 and
base it by the screw 28 having threaded engage
ment with the pin 25. Similar stationary dials
Zia, ‘22a and 23a, are respectively mounted in a
like manner in superposed relation to the rotary
dials 2i, 22, and 23.
Each of the rotating dials 20, 2!, 22 and 23 is
provided with a circular row of ten equally spaced
openings 30 adjacent the peripheral edge thereof,
numbered from 0 to 9 in a clockwise direction in
the manner as shown in Figure 2. Opposite the
numeral 9 on each rotating dial there is pro
vided thereon a cam projection or lug 3| that ex
tends radially outwardly from the periphery of
the dial. For each rotating dial there is pro
vided in the base ii an opening 32, each in a
plane normal to the line passing through the
centers of rotation of the dials 28, 2|, 22 and 23
and so positioned as to register with the open
ings 36 in said dials. Thus with the zero open
45
ing of each dial brought into registry with the
opening 32 all of said dials will be set in their
zero position preliminary to operating the ma
chine in the manner to be hereinafter described. 50
The stationary dials 20a, 2m, 22a and 2311.
ure 2.
are numbered in a counter-clockwise direction
Referring to the several ?gures of the draw
ings, in which corresponding parts are indicated
by the same reference characters, l0 indicates a
from 1 to 9 with the zero position indicated by a
cut-away or notched portion 34 formed on said
dials. The cut-away portions 34 are made large 55
2
2,111,349
enough so that the numerals on the rotating
dials will clearly appear therein, see Figure 1.
As the latter dials are turned, the numerals
thereon being completely covered by said sta
tionary dials except as above indicated, the sta
tionary dials 20a, 2|a, 22a and 230, are positioned
in an identical manner with the cut-away por
tions 34 arranged in opposed relation to the
openings 32 in the base ||.
10
Pivotally arranged for oscillating movement be
tween the rotating dials are indicators 36, 31 and
38. The indicators are preferably formed of very
thin sheet metal having a body portion 39 pro
vided at one end with a semi-circular ?anged
15 abutment 40 and at its other end with a raised
or offset indicating extension 4| of any suitable
shape which may in order to increase its visibility
be given any desired color. The indicators 36,
31 and 38 are arranged in line between the ro
20 tating dials, see Figure 2, and are pivotally at
tached to the base | I by the screws 42. In order
to prevent the indicators from getting out of po
sition the spacer l2 on its long side I4 is provided
with integral tongues or guides 44 and 45, with
25 the guides 44 being of greater length than the
guides 45. Thus with the indicators attached to
the base H the spacer I2 is so arranged that the
long guides 44 will extend beneath the raised
indicating extensions 4| while the short guides 45
30 will extend over the body portions 39.
Referring to Figure 2 it will be observed that
the indicators are so formed that in their normal
position relative to the rotating dials, the abut
ment 49 will ride substantially on the periphery
35 of the rotating dial adjacent thereto while the
indicating extension 4| will substantially clear
the rotating dial adjacent thereto to be com
pletely hidden beneath the cover l3 as will be
hereinafter described.
The cover plate i3 is provided with a row of
40
circular openings 20b, 2|b, 22b and 23b of a di
ameter slightly less than the diameter of the
rotating dials whereby when the cover | 3 is ap
plied the openings 30 in said dials will appear in
45 a circular row between the peripheral edge of
said openings and the peripheral edge of the sta
tionary dials, as clearly shown in Figure 1.
Around each of said openings is provided a cir
cular row of numerals from 0 to 9 in aclockwise di
50 rection with the zero of each row opposite the cut
away portion 34 of the stationary dials.
The base ||, spacer l2 and cover i3 are main
tained in assembled relation by the screws 48.
Referring to Figure 3 it will be observed that for
55 the sake of clarity there is shown a space between
the spacer l2 and cover |3 in actual practice in
View of the thinness of the same and the indi
cators the edges of the spacer and cover are ac
tually brought together by the screws 48.
To add, for example numbers “2165” and
60
“3281”, ?rst with the rotating dials all in the
zero setting, dial “2165” by placing a pencil or
stylus in the opening of the dial 20 opposite the
numeral “2” and turn the same counterclockwise
65 until the pencil engages opening 32 in base ||.
Similarly dial “1”, “6”, and “5” respectively on
dials 2|, 22 and 23. Then “2--1—6—5” will show
in openings or cut-away portions 34 of the sta
tionary dials. Next dial “3281” in a similar man
ner. Now “5—3—4—6” will show in openings 34,
with indicating extension 4| showing above the
numeral “3”. Place pencil in opening opposite
“1” to right of indicator and turn dial 2| counter
clockwise till pencil engages base opening 32.
This forces indicating extension 4| out of View
and the sum of “2165” and “3281” is shown to be
“5446”.
For adding numerals on cover are used with 10
rotating dials turned counterclockwise always
“carrying” when indicated in the manner as de
scribed above. To subtract use the numerals on
the stationary dials and turn the rotating dials
clockwise, “borrowing” when the indicators show. 15
Both borrowing and carrying should be done in
the order of tens, hundreds, thousands.
The calculating machine shown in the mod"
?cation of Figure 4 is constructed on the same
principles as above set forth and is calibrated to
give readings in feet, inches and fractions of an
inch. Thus the rotating dial A gives readings in
feet in increments of ten, the dial B gives read
ings in feet from 1 to 9, the dial C gives readings
in inches from 1 to 11, and the dial D gives read
ings in sixteenths of an inch from 113' to {~2, each
dial being provided with the corresponding num
ber of openings and numerals in the manner
shown. The dial settings as shown in Figure 11
gives a reading of 541171;”. Addition and sub 30
traction in feet and inches is accomplished in the
same manner as described above.
Having thus set forth and disclosed the na~
ture of this invention, what is claimed is:
In an adding and subtracting machine includ 35
ing a casing having a base, sides, and a cover
provided with a plurality of circular openings, a
pair of superposed dials arranged concentrically
with respect to each cover opening and mounted
on the base of said casing, the lower dial of each
pair being rotatable and stylus operated and the
upper dial being stationary, of less diameter than
the lower dial and said circular opening and in
the plane of said opening to de?ne therewith an
annular opening; the combination of an indi
cator member disposed between each
two ad~
jacent rotary dials, each indicator member com
prising a body portion pivoted to the base of said
casing, an abutment at one end of said body por
tion arranged in juxtaposition to an adjacent ro- :
tary dial, and a laterally o?set indicating PS1"
tion at the other end thereof arranged to be
moved within said annular space across the other
adjacent rotary dial, each rotary dial being pro
vided with a cam lug adapted to engage the abut‘
ment of an adjacent indicator member to actuate
the same, said indicator members being arranged
on the same side of said dials and adjacent
side
of said casing and a pair of guide members of
unequal length for each indicator member
to (30
said casing side and extending laterally across
said indicator members, the shorter of said guide
members engaging the upper surface of said body
portions and the longer of said guide members en
gaging the under surface of said indicating por
tion.
WORTH ARNE'I‘T.
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