Adding and Subtracting Machine Page: 2 of 3
This patent is part of the collection entitled: Texas Patents and was provided to The Portal to Texas History by the UNT Libraries Government Documents Department.
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UNITED STATtS PATENT OFFICE.
DUKE WITTNEB'SRT, 'OF DEL RIO, TEXAS.
ADDING AN]i SUBTRACTING MACHINE.Specikscat' n of Letters Patent.
Patented Dec. 14, 1920.
Application filed Sept r 21, 1918.. Serial No. 255,078.
To all whom it may concern:..
Be it known that I, Dun WITTNEBERT, a
citizen of the United States, residing at
Del Rio, in the county of Val Verde and
E State of Texas, have invented new and use-
ful Improvements in Adding and Subtract-
ing Machines, of which the. following is a
specification.
. This invention is an improved adding
10 machine which can be also used for. sub-.
tracting, and which is especially adapted. to
be attached to one end of a lead pencil, the ob-
ject of the invention being to provide a ma-
chine of this kind which is extremely lignt
15 in weight, is small and compact, is easy to
operate and convenient for any class of work
in addition or subtraction, and which can
be readily ;manufactured at small cost and
is simple in construction.
20 With the above and other objects in view,
the invention consists in the construction.,
combination and arrangement of devices
hereinafter described and claimed.
In the accompanying drawings:-
25 Figure 1 is an elevation, on an enlarged
scale, of an adding machine constructed and
arranged in accordance with my invention.
Fig. 2 is a similar view of the same with
the casing in section.
so Fig. 3 is a longitudinal sectional view of
the same.
Figs. 4 and 5 are transverse sectional views
of the same.
In the embodiment of may invention, I
35 provide a pair of shafts 1, 2 which are se-
cured in spaced relation by braces 3 which
are arranged at the ends of said shafts, the
said shafts being fixed. A series of disks
or guide wheels 4, 5, 6, 7 and 8 are fixed to
4L the shaft 2 in spaced relation and respec-.
tively indicate units. tens, hundreds, thou-
sands and tens of thousands and are each
provided with peripherally arranged num-
bers from one to nine, as shown. Carrier
45 wheels 9,10,11, 12 are arranged for rotation
on the shaft 2 and between the disks or guide
wheels 4, 5, 6, 7, 8, and each carrier wheel
is provided with ten radial openings 13 for
the reception of a pencil point or the. like,
5o to enable said wheels to be turned. Each
carrier wheel is provided on one side with a
radially projecting tappet 14 which is fixed
thereto and turns therewith. Each carrier
wheel is provided on the right hand side,
55 which is the side opposite that on which thetappet 14 is arranged, with twenty spur gear
teeth 15,-In. recess 15" in the left hand side
and pe:iphery of each fixed disk or guide
wheel-'is a small detent gear 16 which is
adapted to rotate about:its axis. 60
A . series of .registering wheels or disks
17, 18, 19, 20 and 21-:are mounted on the
shaft 1 for independent rotation aiid'are
arranged in line with the fixed -guide wheels
or disks and are each peripherally numbered 65
from one -to naught,. the 'said. registering
wheels respectively .indicating units,- tens,
hundreds, thousands and tens of thousands.
On the left hand side of each of the regis-.
tering wheels 17, 18, 19 and 20 is a gear of 70
twenty spur teeth 22 which are respectively
engaged by the gear or spur teeth of the car-
rier wheels 9, 10, 11 and 12, so that the carrier
wheel 9 is geared to the units wheel 17, the
carrier wheel 10 is geared to the tens wheel 75
18, the carrier wheel 11 is geared to the hun-
dreds wheel 19, and the carrier wheel 12 is
geared to the thousands wheel 20. Each of
the wheels 18, 19, 20 and 21 is provided on.
the right hand side with a series of ten tap- 80
pets 23 which are parallel and in concen-
tric relation to the shaft 1 and correspond
with the peripheral numbers on said wheels
and are adapted to be engaged by the tap-
pets 14 of the carrier wheels. The detent 85
gears 16 in the fixed guide wheels or disks
also engage the gears of the registering
wheels. The function of these detent gears
is to prevent too free or casual rotation of
the registering wheels without interfering SO
with the necessary step by step rotation of
said wheels.
The registering wheels are covered by a
substantially semi - cylindrical casing 24
which has openings 25, 26, 27, 28, 29 on one 95
side through which respectively the periph-
eral numbers of the registering wheels may
be displayed. At one end of the casing is a
socket piece 30 for the reception of one end
of a lead pencil or other suitable holder. 100
In practice, the machine is, preferably,
very small so that it can be conveniently -
carried on a lead pencil and without inter-
fering with the use of the lead pencil as such
but within the scope of the invention the 105
machine may be made of any suitable size
and may be made of any suitable material.
Preferably, also, to minimize the weight,
the various wheels or disks may be hollow
or spoked. 1101,361,949.
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Wittnebert, Duke. Adding and Subtracting Machine, patent, September 21, 1918; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1257628/m1/2/?q=%22~1%22~1: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.