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Патент USA US2142171

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I Jan. 3, 1939.
' 2,142,171 ‘
Filed July 16, 1938
Z'Sheets-Sheet l
PHI/L f.‘ .Basram
j? . A
Jan. 3, 1939.
‘Filed July 16, 1958
2 Sheets-Sheet 2
Patented Jan. 3, 1939
Paul F. Boston, Greencastle,,.1nd., assignor of
one-half to John B. Boyd, Greencastle, Ind.
Application July 16, 1938, Serial No. 219,553
5 Claims.
This invention relates to a display device
which is particularly useful for educational pur
The device makes use of a box-like container
in which there are placed a number of display
cards so arranged that when said container is
rotated said cards are successively displayed
through one or more apertures therein.
time the container is rotated, the card just shown
10 moves by gravity from its position behind the
display aperture and another card takes its place.
Such containers have heretofore been used for
display purposes and. have either been manually
turned or have been continuously rotated by a
15 motor or other power device.
One object of the invention is to adapt this
type of display device to educational purposes
such, for example, as drill in the multiplication
table or similar mathematical problems. For
20 such uses, manual operation and continuous op
eration are unsatisfactory, the ?rst, because the
time of display of each problem is irregular so
that no accurate measure of results can be ob
(01. 40-81)
elevational view of the same with the rear panel
of the cabinet removed to show the interior con
struction. Fig. 3 is a vertical sectional view
taken substantially on the line 3-3 of Fig. 2.
Fig. 4 is a vertical central section of one of the 5
card containers used with this form of the de
vice. Fig. 5 is a perspective view of the same and
Fig. 6 is a perspective View of one of the display
cards for use with said container.
In the preferred form of the invention shown
in the drawings by way of illustration, the device
is housed in a cabinet consisting of a baseboard
ill, a top H, sides I2, rear panel l3 and front
panel M. The rear panel is preferably remov
able to permit access to the interior of the cabi 15
Within the cabinet there is provided a frame
consisting of a pair of upright members I5 and
i6 formed integrally with a cross member 51
and secured to the baseboard l0 and top H of
the cabinet. A U-shaped receiver 18 is carried
by a pair of trunnions l9 and 20 which are ro
tatably mounted on the frame members [5 and
iii. Card containers 2|, best illustrated in Fig.
tained and the second, because the continuously
25 moving display is not suitable for uniform ob
servation from all parts of the classroom, the
display becoming visible for certain parts of the
classroom before others. Furthermore, continu
proper shape to ?t the receiver 18. A hook 23
is pivotally mounted on one end of each con
ous movement distracts the attention of the chil
30 dren from the problem. To overcome these dif
tainer and is adapted to‘ grasp a pin 24 mounted
on the undersurface of the receiver. The front 30
?culties, there is provided in the present inven
tion time controlled means by which the card
displaying each problem is held in a stationary
display position for a predetermined length of
35 time and the turning movement for bringing an
other card into position is then rapidly accom
plished. By this means, each of the problems
may be displayed for a uniform period during
which the card is equally visible from all parts of
40 the classroom and the students may concentrate
their attention on a stationary object rather than
a moving one. Preferably, the time control is
made variable so that the time of display may be
shortened as pro?ciency in the drill increases.
Another object of the invention is to provide
simple and efficient means by which the inter
mittent turning of the card containerrmay be'
accomplished. To this end the invention in
cludes as one feature the speci?c form of operat
50 ing mechanism hereinafter described.
Other objects and features of the invention
will be understood from the accompanying draw
ings and the following description and claims:
Fig. 1 is a front elevational view of a complete
device embodying the invention. Fig. 2 is a rear
5, are provided with shallow grooves 22 on their
sides and on one end and said grooves are of the
panel M is cut away as shown at 25 in Figs. 1 and
2 ‘and the top H is cut away as shown at 26 in
Fig. 3. .g’I‘hus, the container, when mounted in
the receiver I8, is visible from the front of the
cabinet and may be rotated about the axis of the
trunnions l9 and 20 without interference with
any part of the cabinet. Preferably, a number
of the containers are provided, each stocked with
cards presenting a different series‘of problems.
By the construction just described a container
may easily be removed by unfastening the hook
23 and another one may be put in place and se
cured by the same means.
Each container 2! consists of a rectangular box
divided by a partition 27 into upper and lower 45
compartments, each of which contains a number
of display cards 28‘ shown in perspective in Fig. 6.
Said cards preferably are of pas'teboard or other
suitable material and have mounted on the edges
thereof wooden or metallic runners 29 for rein
forcement and for properly spacing the cards
within the container.
The thickness of the runners 29 is such that
a de?nite number of cards may be placed in each
of .the compartmentsv of the container 2|. For 55
example, as shown in Fig. 4, each of said com
partments is of proper size to freely contain
fourteen of the cards and their attached runners.
The number of cards supplied in the container
is one less than the capacity of the two compart
ments. The lower compartment is normally com
pletely ?lled while the upper compartment has
one vacant space. As the container is rotated
in the direction of the arrows in Fig. 4, the lower
compartment becomes the upper compartment
and during each half revolution a card slides
from the former lower compartment through one
of a pair of openings 30 provided in the parti
The circuit for the motor 36 leads from the
block 51 through the conductor 58, switch 59,
partment. To assist in guiding the cards in their
conductor 6|, rheostat 31 and a conductor 65 to
the motor 36 and thence through a conductor 66
to the second terminal of the block 51. Thus the
motor 36 is operated whenever the switch 59 is
closed and the speed thereof may be adjusted by
means of the rheostat 31.
In the operation of the device, one of the con
sliding movement, the ends of the runners are
Each of the compartments is provided with a
display opening 32, the opening for the lower
20 compartment being visible from the front of the
cabinet and that for the upper compartment be
ing turned inwardly out of sight. In Fig. 4, the
cards are shown in position just at the completion
of a half revolution in which the card 28a last
displayed is sliding downwardly into its new posi
tion in the new lower compartment and in which
another card 28b is now in position for display.
By repeatedly turning the container through suc
cessive half revolutions, both faces of each card
30 may be displayed and all the cards may be suc
cessively shown.
The apparatus for rotating the card containers
2| consists of an electric motor 33 which is con
nected to the trunnion 2|! through suitable reduc
gears contained in a housing-34 and through
a ?exible coupling 35. Preferably the speed of
the motor 33 is such that the container 2| is
turned as rapidly as iscompatible with proper
operation of the cards.
For timing the turning operations of the con
40 tainers 2|, there is provided a variable speed
motor 36, the speed of which may be controlled
by a rheostat 31 suitably connected in circuit
therewith and adjustable by means of a knob 38
. accessible from the frontiof the cabinet. The
,4. Cl motor 36 drives a shaft 39 through suitable re
duction gears carried in a housing 40. The shaft
39 carries a ?nger 4| adapted to engage a collar
42 carried upon a vertical stem 43. Said stem
is slidably mounted in a bracket 44 secured to
50 the frame member I 5 and the upper end thereof
passes through an opening in a lever 45 which is
pivotally mounted at 46 on a rearwardly extend
tainers 2| with appropriate display cards is
latched in position on the receiver I8, the rheostat
knob 38 is adjusted to a graduation indicating
the desired timing of the display periods. At the
start of the operation, the container is normally
in one of its vertical display positions and the
hooked portion 48 of lever 45 engages one of a
pair of notches 54 in the cam disc 49 and thus
restrains the container against rotation. Switch 30
59 is then closed by its lever 66 to start the motor
36 which is then continuously operated to bring
the ?nger 4| periodically into engagement with
the collar 42. When this engagement takes place,
the stem 43 is pressed downwardly and oper 35
ates the lever 45 to remove the hooked portion
thereof from the notch 54, thus freeing the con
tainer 2| for rotation. At the same time, the
lever 45 draws the spring 5| downwardly and
engages the contact leaf 52 with the leaf 53. 4.0
This engagement completes the circuit for start
ing the motor 33. 7 Before said motor has rotated
the container 2| through a half revolution, the
?nger 40 leaves the collar 4| but the hooked
portion 48 of lever 45 is then riding on the outer
surface of the cam disc 49 and thus prevents the
contact leaf 52 from breaking its engagement
with the leaf 53.
As soon, however, as the half
revolution is complete, the hook 48 enters the
second of the notches 54, thus permitting the 50
contact leaf 52 to separate by its own resilience
from the leaf 53. The motor 33 is thus stopped
and the container 2| is held in its new display
ing portion of the frame l5. The stem '43 carries
a pin 41 adapted to engage the upper surface of
the notch 54.
The lever 45 has a hooked portion 48
engaging a cam disc 49 carried by the trunnion l9.
Thelever 45 has secured to its rearward end a
display position until ?nger 40 again strikes the
collar 4| whereupon another reversal of the con
tainer takes place accompanied by a change in
piece of insulating material 59 to which there is
the card displayed.
55 said lever.
to one terminal of the rheostat 31 which is also
connected by a conductor 62 to the contact leaf
53. Contact leaf 52 is connected by a conductor
63 to one terminal of the motor 33, the opposite
terminal of which is connected by a conductor 64
to the second terminal of the block 51. Through
the circuit just traced the motor 33 is operated 10
Whenever switch 59 is closed and contact leaves
52 and 53 are in engagement.
tion 21 into the vacant space in the lower com
beveled as shown at 3| in Fig. 6. ‘
and having its operating lever 60 accessible from
the front of the panel. The opposite terminal
of the switch 59 is connected by a conductor 6|
connected a tension spring 5| secured at its oppo
site end to a resilient electrical contact leaf 52.
position by the engagement of the hook 48 with
The. container remains in its new 55.
In the illustrative example shown herein, 27
Said leaf is adapted when drawn downwardly by
of the cards 28 are used. These cards carry
appropriate legends on both faces and the pro
the spring 5| to engage a second contact leaf 53
and both of said leaves are mounted on, and suit
vision of display apertures in both compartments
of the container permits both sides of each card
ably insulated from, the frame member l5. The
to be shown. Thus there are 54 problems-which
are presented in sequence before the ?rst prob
lem is repeated. If a display aperture were pro
vided in one of the compartments only and the
corresponding notch 54 were omitted from the
cam disc 49, obviously the device would make a 70.
complete revolution at each operation and only
one face of each card would be shown. For that
reason I do not wish to limit the scope of the
invention to a container with two display aper
contact leaves 52 and 53 constitute an electric
switch in the circuit of the motor 33.
Electrical power for driving the motors 33 and
36 is preferably obtained by means of a plug 55
70 which may be inserted in any suitable receptacle
connected to a source of electrical current. The
plug 55 is connected by a cord 56 to a terminal
block 51 within the cabinet. One terminal of
said block is connected by a conductor 58 to a
75 snap switch 59 mounted on the front panel l4
tures turning a half revolution at each operation. 75
Other variations in the structure herein illus
trated will be apparent to those skilled in the
art and may be made without departing from
the scope of the invention as de?ned by the
appended claims.
into position behind a display aperture therein as
said container is rotated, the combination of a
motor for turning said container, an electric cir
cuit for energizing said motor, a switch in said
circuit, a variable speed motor, switch closing 5
The invention ?nds an important use in the
means periodically operated by said variable speed
lower grades of the common schools where the
?rst principles of arithmetic are taught. In such
motor to close said switch to start the ?rst men
tioned motor, and other means retaining said
switch in closed position until said container has
use, a container may be stocked with a series of
10 cards carrying a pro-arranged series of problems
in addition, subtraction, multiplication or divi
A marking on the container such as the
“X” shown at 61 in Fig. 1 indicates which opera
tion is to be performed. The cards may be
15 selected with reference to the state of training of
the children, the simpler problems being shown
to beginners. Slips of paper are provided with
numbered spaces in which the pupils may enter
the answers to the problems in the order in which
20 they are shown. The device is operated rela
tively slowly at ?rst and the speed of motor 36
is gradually stepped up as the children attain
pro?ciency in solving a given group of problems.
It has been found that the use of the device
greatly increases the interest of the children in
the subject taught. Beating the apparatus comes
to be a sort of game in which they take part with
evident pleasure. The interest may be increased
by announcing the speed setting of the appa
30 ratus before or after a series is run.
Such an
announcement arouses in the pupils a desire to do
it a little: faster next time. It has been found also
that the use of the apparatus, by introducing the
time factor, eliminates many of the time consum
35 ing processes, such as counting on the ?ngers,
which children sometimes contrive for solving
arithmetic problems. While arithmetical prob
lems are peculiarly adapted to the use of the de
vice, obviously it may be used for other subjects
40 as well.
The invention claimed is:
1. In a display device of the type having a ro
tatably mounted container carrying a plurality
of display cards arranged to move successively
45 into position behind a display aperture therein
as said container is rotated, the combination of a
motor for turning said container, an electric cir
cuit for energizing said motor, timing means con
trolling the operation of said circuit to energize
50 said motor at predetermined time intervals, and
been turned su?iciently to display another card 10
and then opening said switch.
3. In a display device of the type having a
rotatably mounted container carrying a plurality
of display cards arranged to move successively
into position behind a display aperture therein as 15
said container is rotated, the combination of a
motor for turning said container, an electric cir
cuit for energizing said motor, a switch in said
circuit, a variable speed motor, switch closing
means periodically operated by said variable speed 20
motor to close said switch to start the ?rst men
tioned motor, and means for controlling the speed
of said variable speed motor to vary the time
periods between operations of said ?rst men
tioned motor.
4. In a display device of the type described,
a U-shaped receiver mounted for rotation about
a horizontal axis, a box-like display card con
tainer having recesses ?tting the legs of Said U
shaped receiver, means detachably securing said 30
container on said receiver with said legs ?tted in
said recesses, and means for intermittently rotat
ing said receiver and the container carried there
by about said axis.
5. In a display device of the type described,
a frame structure, a receiver having a pair of hor
izontal trunnions pivotally mounted on said frame
structure, a display card container detachably se
cured to said receiver, a turning motor operatively
connected to one of said trunnions for turning
said receiver and container, a cam disc secured
to one of said trunnions and having one or more
notches therein, a lever having a portion nor
mally engaging one of said notches to retain said
receiver and container in a display position, an 45
electric switch operated by said lever, said switch
being open when said lever engages one of said
notches and closed when said lever is withdrawn
therefrom, an electric circuit including said
switch and adapted to start said motor when said
switch is closed, a timing motor, and means oper
other means controlling the operation of said cir
cuit to stop said motor when said container has ated by said timing motor for periodically operat
been turned su?iciently to display another card.‘ ing said lever to withdraw the same from said
notch and to close said switch.
2. In a display device 'of the type having a ro
tatably mounted container carrying a plurality
of display cards arranged to move successively
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