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Патент USA US2129265

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Sept. 6, 1938.
Filed May 9, 1936
M. ./7
Patented Sept. 6, 1938
Frederick Duby, Miami, Fla.
Application May 9, 1936, Serial No. 78,903
1 Claim. (Cl. 235—140)
My invention relates to improvements in add
ing machines, and particularly to a small portable
adding machine of a type adapted for personal
An object of my invention is to provide an
adding machine that is small and compact, and
is of such form and size that it can be readily
held in the hand while being used and can be
placed and carried in the pocket or in any other
10 small space, as desired.
Another object is to provide an adding ma
chine structure having a positive and accurate
carryover mechanism which dispenses with the
use of gearing or other complicated parts or
15 mechanisms that would increase the cost of
manufacture and which in use are likely to be
come unmeshed or otherwise disengaged
render the total sums inaccurate.
Sitll another object is to provide an adding ma
20 chine structure with which the case and all of the
parts can be made of sheet metal stampings,
or of parts readily produced upon automatic
screw machines, and with which the various parts
are readily and inexpensively assembled to thus
25 produce an adding machine that can be sold at
low cost.
With the above and other objects in view, which
will be apparent to those skilled in the art, my in
vention includes certain novel features of con
30 struction and combinations, arrangements and
assemblies of parts, which will be hereinafter
set forth in connection with the drawing and
then pointed out in the claim.
In the drawing:
Figure 1 is a perspective view showing an add
ing machine constructed in accordance with my
Fig. 2 is a view in elevation with the front of
the case removed.
3 is a longitudinal sectional view through
40 theFig.
structure substantially on line 3-—3 of Fig. 2.
Fig. 4 is a view in elevation of the front or top
of the case.
Fig. 5 is a view in side elevation of the member
45 shown in Fig. 4.
Figs. 6 and 7 are transverse sectional views
taken through two forms of adding belt struc
The case I, which is substantially rectangular
in plan, can be made up of sheet metal or other
suitable material and this case has the side walls
2 and end walls 3 extending forwardly from the
back portion 4. A cover portion 5 has side and
end walls 6 and ‘l, of similar construction, and the
55 cover portion is preferably made slightly larger
than the casing portion I so that the cover will
?t telescopically upon the case. As a convenient
means for holding the cover upon the case, the
case can be provided with indentations 8 to re
ceive correspondingly formed and inter?tting
bosses 9 provided on the cover, and thus the cover
will be held upon the case against accidental
or casual displacement.
Shafts IE3‘ and H are mounted transversely
across within the casing structure I between the 10
side walls 2 and slightly spaced from the end
walls 3, and these shafts have thereon idler
rollers l2 and 13. These idler rollers are adapted
to mount idling belts or bands having numbers
thereon, and in the present instance I have shown 15;
four of these bands, these being respectively the
units band Hi, the tens band IS, the hundreds
band It, and the thousands band H. The shafts
it and t l are intended to remain stationary, and
the mounting rollers l2 and I3 for each band will 20
revolve separately and independently of the roll
ers of any other band, spacing discs 13 being pref
erably provided on the shafts Ill and H to hold
the rollers 12 and IS in properly spaced rela
tion and to prevent endwise contact and conse- 25
quent frictional bearing of one roller against
another. At the same time, the belts or bands
are spaced and are held from contact at their
edges so that ordinarily movement of one band
will not in any wise impart or transmit move- 30
ment to, or otherwise affect, any of the other
The several belts or hands l4, !5, I6 and I‘!
are substantially duplicates one of the other,
and these bands are made up of thin ?exible 35
metal, or of any other‘ desired and suitable ma
terial which will travel readily upon the rollers
and will permit of the carrying of number des
ignations. The several bands are here illustrated
as being made up of a continuous strip of ma- 40
terial provided with a plurality of equally spaced
lugs, tabs, or other‘ protuberances or extensions
l9, the belt or band carrying or having marked
or otherwise shown thereon adjacent to these
extensions or protuberances numbers from 1 45
and through 9 to zero. In the present instance
I have illustrated the bands as being of sufficient
length to accommodate two
such numbered
series of extensions or protuberances, and it is
to be understood that any desired duplication 50
of such series can be employed, the belts or bands
being correspondingly lengthened or shortened.
The cover 5 has a series of slots 20, 2|, 22 and
23 formed through the top thereof and lined up
to receive and permit travel of the lugs or other 55
protuberances or extensions l9. At their upper
ends these several slots are provided with number
or sum viewing openings 24, and along their
length the slots have numbers shown at spaced
points corresponding substantially to the spac
ing of the protuberances or extensions IQ’ of
the lugs [9 on the belt or band members. These
numbers as shown on the top of the cover are
made to read from I and increasing upwardly
10 along the length of the slot toward the viewing
or window opening 24, and the extensions or
protuberances [9' of the lugs l9 are intended
to be presented through the slots to travel ad
jacent to the numbers, as shown at 25 on the
15 upper face or top of the cover. The several slots
have lateral extensions 30 at those ends away
from the window openings 24, to permit passage
of the extensions or protuberances I 9'.
The respective bands or belts I4, l5, l6 and I?
20 will be selectively and separately manipulated as
?gures are to be added; but, in order that the
total may be accurately and completely shown, it
is necessary that some carryover mechanism be
provided to accumulate and transfer from the
right hand column to the next adjacent left
hand column as ten points are accumulated.
With this in mind, I provide extension carryover
pins 26, 21 and 28 upon the three belts or bands
l4, l5 and Hi, there being no necessity for a
30 carryover pin for the last belt or band on the
left hand side. These pins have extensions 3i
projecting in each instance from the left hand
side of the belt or band and underneath the
next adjacent belt or band to the left, and ordi
35 narily these extension ends of the pins will slide
or travel freely below the next adjacent belt
without causing any movement of the belt. flow
ever, as the projecting end of the pin approaches
one of the rollers 12 or £3, this projecting end
40 will necessarily be interposed between the outer
surface of the roller and the inner face of the
corresponding belt or band, in consequence of
which the pin will cause the band to be carried
over and moved substantially one point or num
With this arrangement, accumulation of
ten units on the belt or band M will bring the
pin 26 to a position where it will ride between the
band 15 and the mounting wheels therefor and
will cause the tens band l5 to be moved forward
one point. A like result will be accomplished and
the parts will function to carry over from the tens
to the hundreds column, and from the hundreds
to the thousands column.
It will be understood that where the belts or
bands have two sets of numbers thereon, each belt
or band wil have two of the extension carryover
pins 26, 21 and 28. With this construction both
carryover pins will function to prevent torque or
twisting of the belt or band being manipulated,
60 especially when an addition will cause two or
more belts to move at the same time on account
of these carryover pins.
Where the ends of the shafts l0 and II project
it may be necessary to provide accommodating
slots 29 in the side 6 of the cover 5, and otherwise
cover and case structure can be made up to suit
particular requirements of use.
As illustrated in Fig. 6, the extension or pro
tuberance I9 is cut or stamped from the material
forming the belt or web or band, and is bent over
or formed to provide an extension that will over
lie the upper face of the cover adjacent to the
elongated slots therein, and with this construction
the several protuberances or extensions will at
all times be presented to be readily engaged with
the thumb nail, with the ?nger or in any other
manner that may be desired for operation of the
machine. In Fig. 7, I have shown the protuber
ance or extension l9a as set upon or secured to
the belt or web portion, and obviously these parts
can be constructed in many other manners.
From the foregoing it will be seen that I have
provided an adding machine which is of simple
and inexpensive construction to thus be manu~ 20
factured and sold at low cost, which will function
accurately and efficiently to add up and total
sums in addition, and which is of such construc
tion that there is little likelihood or possibility
of the parts becoming damaged or disarranged
from use and of the carryover mechanism failing
to function.
In lieu of the bands or belts I4, [5, l6 and I1
chains or other link band structures may be
employed, the primary function of course being
to have a band structure which will carry num~
bers to be viewed through the window or sum
viewing openings 24 and which band portions
will at the same time present parts to be avail~
able through the several elongated slots for carry
ing down or adding in any desired number from
1 to 9. As illustrated in Figure l, the elongated
slots in the cover may be made to take more
than nine spaces and the window or sum viewing
opening, and then in a single operation a num
ber greater than 9, as for instance 11 or 12, can
be added with a single manipulation in the units
While I have shown and described only certain
speci?c and particular embodiments of my in
vention and have suggested only certain possible
modi?cations, it will be appreciated that many
changes and variations can be resorted to in the
form, construction, arrangement, assembly, and
the materials employed, without departing from
the spirit and'scope of my invention.
I claim:
In an adding machine having a plurality of
sets of spaced rollers independently revoluble and
mounting number carrying bands to be independ
ently movable, carryover pins on each of the
bands of lower order having an extension lying
beneath the adjacent band of next higher order
in position to engage between the band and roller
and thereby accomplish carryover movement of
the band .of the next higher order when the
adjacent lower order band has been moved to
accumulate a carryover sum.
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