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Патент USA US2120307

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June 14, 1938.
D. R. BAKER ET AL
DISPLAY DEVICE
Filed Aug. 21, 1955
2,120,307
'
2 Shéets-Sheet 1
@Ziz
INVENTOR
Donald H. Bake)’.
Hang/Y F.’ Nordmark.
ATYTORN EY
June 14, 1938.
D, R BAKER H M
2,120,307
DISPLAY DEVICE
Filed Aug. 21, i935
'2 Sheets-Sheet 2
W
'/'
A
INVENTOR
_
‘ Donald R?ahen
Henry 1°. Hora’mark
BY (YB
ATTZRNEY
2,126,367
Patented June 14, 1938
UNITED STATES PATENT OFFECE
2,120,307
DISPLAY DEVICE
Donald R. Baker, New York, N. Y., and Henry P.
Nordmark, Grand Rapids, Mich., assignors to
Kay Displays, Inc., New York, N. Y., a corpo
ration of New York
Application August 21, 1935, Serial No. 37,144
3 Claims.
(Cl. 172—126)
The invention relates to rotary display devices,
and more particularly to new and improved actu
ating means therefore.
One object of the invention resides in the pro
5 vision of a device of the character described em
bodying actuating means of high mechanical ef
ficiency, low manufacturing cost and ready
adaptability to display devices of varying sizes and
operating characteristics.
10
It is yet another object of the invention to pro
vide an actuator comprising a unitary structure
including a prime mover, and an associated driv
ing-connection adapted to communicate move
ment from the prime mover to a display device,
the prime mover and driving-connection unit,
being adapted for ready attachment to a display
device.
Another object of the invention is the provision
of a frictional driving-connection between a
20 prime mover and a display device, adapted to
utilize the resistance to movement of the device
to augment the frictional coefficient between the
driving-connection and device.
Other objects and advantages will be apparent
5 in the following description of a preferred em
bodiment of the invention which has been se
lected for illustration in the accompanying draw
ings. It will be understood however, that many
changes in form, construction and arrangement,
may be made by those skilled in the art, without
departing from the scope and spirit of the inven
tion, as expressed in the appended claims.
In the accompanying drawings; Figure 1 is a
plan view of a display device embodying a pre
ferred form of the invention, the display platform
or turntable being removed to better illustrate
the actuating mechanism therefor.
Figure 2 is an elevational view of the device
shown‘in Fig. 1, the turntable occupying its opera
tive position and being partially broken away.
Figure 3 is a vertical cross section taken on the
line 3—3 of Fig. 1.
Figure 4 is an enlarged perspective view of the
unitary prime mover and driving connection
I2 which additionally functions as a mounting for‘
an axial, and normally depending spindle l3.
The spindle I3 is rigidly maintained in fixed
relation with respect to the turntable, by a plural 01
ity of brackets M, which engage the spindle inter
mediate its ends and extend radially outwardly,
and upwardly, to points of attachment to the un~
der surface of the plate. The lower end of the
spindle is adapted to be received in a step bearing
15, secured to the base I I, and a bearing bracket
!6. likewise fixed to the base, and formed with a
laterally extending bearing lug ll, serves to jour
nal the spindle for rotation on a vertical axis. A
circumferential apron I8, is secured to the pe 15
riphery of the turntable and projects downwardly
therefrom into proximity to the surface of the
base to shield the latter from View.
A preferred form of actuator, comprising a
unitary prime mover and driving-connection, is 20
shown as applied to a display device in Figs‘. 1
to 3 inclusive, the same unit being illustrated in a
detached, enlarged perspective view in Fig. 4.
The unit comprises generally, a prime mover H,
a driving-connection 20, a prime mover control 25
switch 2|, and a common supporting frame 22.
The prime mover, in this embodiment of the in
vention, consists of an electro-magnet 23, the
magnetic ?eld of which acts upon an armature
24, pivoted adjacent one of its ends to similar up 30
standing ears 25, formed on the frame 22. The
free end of the armature is operatively con
nected to a flywheel 26, by means of a link 21.
The ?ywheel 26 is ?xed to a shaft 28 journaled in
a vertical extension 29 of the frame.
Referring now to Fig. 5, a spur gear 30 is non
rotatably secured to shaft 28 intermediate the
?ywheel 26 and frame extension 29, and consti
tutes the driving member of a gear train 30, 3| and
32. The gears 3|, 32 are carried on stub shafts 40
33, 34, journaled. in the side walls of a gear case
35, which in turn is operatively supported on
shaft 28.
The shaft 34 proiects externally of
the side wall of the gear case to receive a fric
shown in Figs. 1 to 3 inclusive.
tion wheel 36 which is rigidly secured thereto.
Figure 5 is an enlarged fragmentary sectional
view of part of the driving connection of Figs. 1
1504 inclusive.
will be seen that the gear case constitutes in ef
feet, and is adapted to function
a lever arm
pivoted on shaft 28 and that its angular move
Figure 6 is an elevational view of an alternative
50 form of actuating mechanism.
I
surface being reinforced by an underlying plate
It
ment is accomplished without disturbing the driv
ing connection between the shaft and friction
In the drawings, the invention is shown as ap
plied to a rotary display device consisting of a
turntable I 0, supported for rotary movement in a
horizontal plane spaced above a base H. The
wheel 36. The gear case is normally urged in a
counterclockwise direction as viewed in Figs. 2
and 4, by means of a counterweight 31, carried on
turntable, as illustrated, is circular in contour, its
radially of shaft 28 in a direction opposite from 55
an arm 38 secured to the gear case and projecting
2
2,120,307
the case. Thus the friction wheel 36 is yieldably
urged into driving engagement with a peripheral
track 39, de?ned by a downwardly dished section
of the plate 12.
It will be observed that the track 39 is of sub
stantial radial width so that the actuating unit
terweight 31 and thereby increasing the fric
tional coe?icient between the driving wheel and
its track.
The desired result may likewise be attained by
reversing the above mentioned relative positions
of the pivotal axis and driving Wheel, and caus
may be attached to the base II, by means of a
ing the latter part to rotate in a counter-clock
wise direction.
laterally extending frame ?ange 22a, through a
wide range of distances from the rotary axis of
10 the turntable, thus permitting operation of the
turntable through a comparatively wide range
of speeds, with a single speed actuator.
In addition to the functions previously enu
merated, the shaft 28 operates to control a flow
of current to the electro-magnet 23. To this end
the shaft is ?tted with a cam 40, arranged to
engage one arm 4|, of the switch 2| which is
supported by, and insulated from, the frame 22.
A second arm 43 of the switch 2!, likewise sup—
ported by, and insulated from the frame 22, is
provided with a contact point arranged to coact
with a similar contact on the arm 4l, so that
rotation of the shaft 28 will intermittently cause
the respective contact points of the switch arms
4| and 43 to abut, thereby permitting a flow of
current from a source of electrical energy to one
terminal of the electro-magnet.
In the present embodiment of the invention
it is contemplated that dry cell batteries will be
Generally stated, the invention comprehends
any angular disposition of the lever arm, and 10
any operating characteristic of the friction driv
ing wheel, in which the resistance to movement
of the turntable reacts in such a manner as to
cause the lever arm to tend to move into engage
ment with the turntable, thus augmenting the 15
frictional coefficient between the wheel and table.
With a view to economical construction and
ease of maintenance, manual, rather than auto—
matic starting of the prime mover is contem
plated, and in this connection the above discussed
principle of reacting forces is again ,utilized.
Referring again to Figs. 1 and 2, it will be obvi
ous that manual rotation of the turntable, in
the direction in which it is driven by the friction
wheel 36, i. e. counter-clockwise; will exert a 25
force opposite to force 54, at the point of con
tact of the track 39 with the friction wheel. Such
a force will exercise a downward component on
current might likewise be employed. Referring
to Figs. 1, 2 and 3, dry cell batteries 44, are sup
ported upon the base II, and shielded therefrom
the lever arm 20 thus tending to diminish the
coef?cient of friction between the track and fric 30
tion wheel. It has been found in practice that
this effect is so marked as to frequently necessi
tate several successive manual movements of the
turntable in a counter-clockwise direction before
by trays 45, adapted to prevent such electrolyte
the prime mover is set in motion.
as may leak from the batteries from injuring the
quence, after moving the master switch 50 to
30 utilized as a source of electrical energy, but it
will be understood that an external supply of
base.
The batteries in this instance are connected
in parallel, one with the other, by means of
40 conductors 45 and 41, and a conductor 48 estab
lishes a circuit between the negative poles of the
batteries and one terminal of the electro-magnet.
A conductor 49, master switch 50, conductor
5|, switch arms 4| and 43 of switch 2|, and con
45 ductor 52, complete the circuit from the positive
poles of the batteries to the electro-magnet.
Referring to Figs. 4 and 5, the arrow 53 indi
cates the direction of rotation of the friction
wheel 36 which, from an examination of Fig. 2,
50 will be seen to have the effect of rotating the
turntable in a counter-clockwise direction, as
viewed in Fig. 1.
Reverting again to Fig. 2, it will be apparent
that the inertia, and frictional resistance to
55 movement of the turntable, will give rise to an
opposed force of equal magnitude to that exer
cised by the friction wheel at its point of con
tact with the turntable; since for every action
there is an equal and opposite reaction. This
reacting force will be exerted tangentially of the
friction wheel at the point of contact of the
wheel with track 39, as indicated by arrow 54.
By the application of well known principles of
mechanics it will be seen that the force 54 will
65 be resolved into two or more components, one
of which will act normally of the longitudinal
As a conse
35
closed, or circuit making position, the turntable
is preferably ?rst rotated in a reverse direction,
i. e, clockwise, the tangential force exerted on
the friction wheel assuming the same direction 40
as arrow 54 and thus having a component which
tends to urge the friction wheel into driving en
gagement with its track, to effectively communi
cate movement to the prime mover.
With the
prime mover energized through rotation of shaft 45
28 and resultant actuation of switch 2 l, the flow
ing current will tend to reverse its direction of
operation, whereupon, a slight assisting counter
clockwise thrust, applied to the table, will imme
diately set the device in operation.
50
An alternative form of actuator is illustrated
in Fig. 6 and consists generally of a rotary type
motor 55 supported on an arm 56 of a bracket 51
pivoted at 57a on a pedestal 58. An arm 59 of
bracket 57 carries a gear reduction unit 80 which
serves to communicate rotary motion of the motor
55 to a friction wheel 6| adapted to engage the
peripheral track 39. It will be observed that in
this embodiment of the invention, the Weight of
the motor functions to yieldably urge the friction 60
wheel into engagement with the track. It will
be understood that suitable electrical connections
will be made to the driving motor, and that a
self-contained source of electrical energy such
as the batteries of Figs. 1. and 3, or an external 65
supply of current may be employed. This con
axis of lever arm 20 at the point of contact of
struction, like that previously described, will be
friction wheel 35 with track 39. Thus by posi
tioning the pivotal axis 28 of the lever arm de
seen to comprise a unitary structure including a
prime mover and an associated driving connection
adapted to communicate movement from the 70
prime mover to a display device.
We claim as our invention:
1. In a device of the character described, in
?ned by gear case 35 to the left, (as viewed in
Fig. 2) of the point of contact of the driving
wheel with its track; and then causing the driv
ing wheel to rotate in a clockwise direction, the
reacting force will tend to rotate the lever arm
upwardly, thus augmenting the action of coun
cluding a turntable, the combination of a unitary
turntable actuator comprising a frame, a prime 75
2,120,307
mover supported by said frame, a shaft journaled
in said frame and operatively connected to said
prime mover, a gear case pivotally mounted on
said shaft, a gear train in said case arranged to
be driven from said shaft, a friction driving wheel
journaled adjacent the free end of said case for
rotation on an axis parallel to said shaft and ar
ranged to be driven by said gear train, a circuit
connecting a source of electrical energy with said
10 prime mover, a switch in said circuit arranged
to be actuated by said shaft to control a flow of
current to the prime mover, and means tending to
rotate said case to yieldably urge said friction
wheel into engagement with said turntable.
15
2. In a device of the character described, in
cluding a turntable, the combination of a turn
table actuator comprising a frame, an arm pivoted
on said frame for movement in a plane substan~
tially normal to the plane of the surface of the
20 turntable, a drive wheel operatively supported ad
jacent the free end of said arm on an axis substan
tially coincident with a radius of said table, a
prime mover supported on said frame and ar
3
ranged to drive said wheel, and means to yieldably
urge said wheel into driving engagement with
said table.
3. In a device of the character described, the
combination of a turntable supported for rotary
movement in a horizontal plane, a frame, a
lever arm pivoted below said table on said frame
and extending laterally and upwardly toward the
table in a plane normal thereto to de?ne an acute
angle therewith, a friction wheel journaled ad
10
jacent the free end of said arm on an axis sub
stantially coincident with a radius of said table
for rotation in a plane parallel to the axis of said
arm and normal to the plane of said table, yield
able means to maintain said wheel in frictional 15
engagement with said table, and means on said
frame to rotate said wheel in a direction to cause
the resistance to movement of said table to exert
a force tending to augment the action of said
20
yieldable means.
DONALD R. BAKER.
HENRY P. NORDMARK.
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