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Патент USA US2411754

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Nov. 26, 1946.
Filed July 4, 1945
3 Sheets-Sheet 1
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BY (P. Q‘
Nov. 26, 1946.
Filed July 4, 1945
3 Sheets-Sheet 2
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Nov. 26, 1946.
Filed July 4, 1945
1713. 7.
49 $797!?-
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3 Sheets-Sheet 3
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BY 0. Q
Patented Nov. 26, 1946
Marion J. Pifer, Williamsville, Carl F. Carlzen,
Buffalo, and Harold J. McGarvey, Eggertsville,
N. Y., assignors to Colonial Radio Corporation,
Application July 4, 1945, Serial No. 603,130
11' Claims. (01. 74-10)
This invention relates to a tuning unit for
radio receivers, and more particularly to what
is known as a “sequence tuner”; that is, one in
which the apparatus may be pre-set or adjusted
to operate, in response to the pushing of a single
accuracy of settings or cause
button, to tune successively, in a predetermined
order, each station of a previously-selected group
01 stations.
Such tuners are particularly useful, in automo
bile radios where the tuning may be‘ controlled 10
vention itself, however, both as to its fundamen
tal principles and as to its particular embodi
ments, will best'be understood by reference to the
unit for installation in the receiver.
improper tuning of
pre-set stations.
The features of novelty which we believe to be
characteristic of our invention‘ are set forth with
particularity in the appended claims. Our in
speci?cation and accompanying drawings, in
by a single push button mounted on the steering
Fig. 1 is a top plan view of the sequence tuner
column or by a foot switch mounted on the ?oor.
vin accordance with our invention,
Each closure of the switch operates the tuning
Fig, 2 is a vertical section on lines 2-2 of Fig.
mechanism to change frohr'one station to the
1 with the tuner in normal position,
next, in the order for which the apparatus has 15
Fig. 3 is a section on lines 3--3 of Fig. 2,
been previously pre-set. When the last sta
Fig. 4 is a front elevation of the tuner,
tion of the group has been tuned in, the next
Fig. 5 is a rear elevation with part of the hous
operation of the switch causes the mechanism to
ing broken away to show internal construction,
tune in the ?rst station, and the station tuning
.Fig. 6 is a detail view showing the solenoid, its
cycle begins again.
20 core, and the bail which is operated thereby,
Among the objects of our invention may be
Fig. 7 is similar to Fig. 2, but showing the
mechanism in the position it takes when the tur
To provide a tuning unit in which the mechan
ret has just finished the forward half of its stroke
ical parts, the electrical components, and the
and tuned a new station, with the latching part
dial indicator may be built complete as a single 25 ‘M distorted 90° about shaft i511 to bring it into
Fig. 8 is similar to Fig. 5, but showing the
To provide such a mechanism capable of easy
pre~setting or calibration to receive any one of
a number of selected stations.
To provide such aunit including a manual tun
mechanism in the same position as the parts in
Fig. 7,
Fig. 9 is a plan view of turret l3 similar to Fig.
3, showing the notched rocker bar it,
ing knob, the operation of which. is not interfered
’ Fig. 10 is a section on lines iil—i@ of Fig. 9,
with by the sequence tuning mechanism and
Figs. 11, 12, and 13 are horizontal sections on
which requires no preliminary operation, such
line H-l l of Fig. 8,
as pushing in the knob, indexing to especial
setting, pushing a special button, or the like, in 35. Fig. 141s a horizontal section through the rock
er bar bearings showing clutching mechanism
order to tune manually.
. taken on line ill—i 4 of Fig. 7, and
To provide such a unit having a dial pointer
Fig. 15 ‘is a section on lines l5-l5 of Fig. 14,
formed as a part of the tuning unit.v
To provide such a tuning unit which may be
showing shape of bearings.
the mechanical parts.
of the tuning instrumentality is preferably lin
easily pro-set or adjusted to select desired sta 40 The following brief summary of the construc
tion and operatlonof our tuner, it is believed,
tions without the use of tools of any kind, and
will facilitate an understanding of the more de
which can be set up by anyone.
tailed description appearing later.
To provide a unit which is relatively small,
compact, light in weight, and of high mechanical 45 In accordance with our invention, signal selec
tion is accomplished preferably by what is known
efilciency. To provide such a unit with interlock
as permeability tuning; that is, the movement of
ing safety features preventing the possibility of
iron cores In (Fig. 2) into and out of coils ll of
damage to the parts through incorrect operation.
the tuning circuits; but it will be understood that
To provide such a unit which will unfailingly
other tuning instrumentalities may be employed,
tune closely to desired stations, without requir 50 such, for instance, as the movement of copper
ing excessive and unusually small tolerances in
slugs into and out of the coils. The movement
To provide a unit of such design and construc
ear, and‘such linear movement is derived from
tion that it is substantially free from backlash,
rotary movement of tilt or rocker bar ii.
and in which normal wear does not destroy the 55 The angular position to which tilt or rocker
bar I2 is set determines the position of the
variable tuning instrumentality and, therefore,
the frequency of the tuned circuits and the sta
tion to be received.
The tilt or rocker bar is
and may project through an opening in o?set '
lip 200. on the front of the housing. At its rear
end it may rest in bushing i5c carried by the
rear face of housing 20. Adjacent to its front
end, inside the housing, this shaft may carry
operated by selector turret l3 (Figs. 2, 3) mounted
tubular gear i1 pinned thereto.
for both axial and rotary movement, and carry
Shaft i5a' is biased to the forward extremity
ing a number of adjustable selector screws Ma,
of its movement by means such as spring iibe
Mb, 14c, Md, and He arranged with their axes
surrounding shaft I51: and con?ned between off
parallel to the axisbf rotation of the turret.
When the turret moves axially, driven, for ex 10 set face 20a of the housing and pin led extend
ing through the shaft. The forward extremity of
ample, by a solenoid energized by closure of the
its motion is reached when the forward end of
sequence tuning switch, one of these selector
tubular gear i'i ‘abuts against the inside face of
screws engages one rod i2a oi’ the tilt bar,- and
offset shoulder 20a.
the other rod 92b of the tilt bar is engaged by
Gear ll is at all times in‘ mesh with gear 2i.
hub 08a of turret it, adjusting the tilt bar, and 15
Gear 2!, having sleeve 2M. secured thereto, is
by it, the tuner, to the position corresponding to
mounted for rotation on carrier rod 22, which
the pre-set station. Rotation oi’ turret it to
extends through housing 2t, and is secured in
bring di?erent selector screws ida, Mb, iélc, Md,
position by nuts 22a and >221: engaging the
and Me into position to engage the tilt bar pro
vides for selection of di?erent stations. ‘
20 threaded ends thereof. Spring washer 23 may
be interposed between gear 2i and the forward
Turret it is normally out of engagement with
face of the housing, and the position of gear 29
tilt bar it, during which time the manual tuning
lengthwise of shaft 22 may be determined by
knob i5 is clutched to the tilt bar. When the
collar Ztmounted on carrier rod 22 and secured
turret moves forward to change the station tun
ing, the manual knob is de-clutched from the 25 thereto as by pin 26.
G'ollar or tube Zlb of resilient friction material
tilt bar, which is thereby left free to rotate to
such as rubber may surround sleeve Zia. This
the position determined by turret i3; and when
collar 2ib, secured on sleeve Zia, serves to drive
the turret reaches the end of its forward stroke,
' tilt bar it upon manual tuning through sector
tilt bar it has been moved to the position corre
sponding to the new station, and that station is 30 shaped plate 25 having a knurled face and car
ried by bracket 2e secured to end plate 2i of the
tilt bar assembly.
Immediately afterward, turret l2 executes its
Tilt bar it is preferably formed by two end
return or indexing stroke and near the end there-.
plates El and 28, joined by the two contact rods .
of is given one step of- rotation’, preparing it to
tune the next station in sequence. At the ‘same 35 i212 and i227. These rods are not symmetrically
placed with respect to the center of rotation of '
time the manual knob is re-clutched to tilt bar
bcI~ l2, rod l2a being somewhat larger in
it so that'manual tuning may be accomplished
diameter and placed further from the center of
without any preliminary operations, such as
rotation‘ of tilt bar i2 than rod Mb. The entire
pushing in, the knob, pushing a‘ manual button.
40 tilt bar assembly is mounted for rotation on bear
or the like.
ings 29 and vtil (Fig. 3). Bearing 29 may be
Calibrating or pro-setting the apparatus for
adjustably screw threaded into housing 269 and
desired stations is accomplished by means of
in adjusted position by nut 2am. . V type
gears ltd, 8th, the, ltd, and the, one of which,
bearings are preferably used in the end plates
in the forward position of the turret, meshes
2i and 23 with springs 2M and 28a to hold the
with gear it mounted on manual tuning shaft
studs in the V's. This eliminates any
the. These gears are normally disengaged, but
possible play in bearings.
may be engaged in the forward position of the
. turret by pushing in the manual tuning knob
against its spring bias. Turning the manual tun=
the knob under such conditions tunes in the de»
sired station and pre-sets the selector, by adjust
‘ ing the selector screw to the proper position to
tune the station.
Mechanical interlock id is provided to prevent
depression of the manual tuning knob except
when the turret is in forward position where it
can be adjustedto set up stations. This inter
The lower end of end plate 28 of tilt bar 02 '
may extend below manual tuning shaft leg and
be connected by link ti to slider 212v carrying
permeability cores it. From this it will be seen
that as tilt bar i2 rocks in its hearing, it carries
with it slider 82, moving cores it into and out of
their respective coils to vary the receiver tuning.
The upper end of end plate 26 may project
beyond housing 26 through opening 88 and car
ries pin 86 carrying ball to engaged by double link
86. The opposite end of link 23o may engage second ball 37! carried by pin 38 secured to bell crank
tuning switch, if that switch is mounted on the
receiver chassis, and it may be arranged to hold 60 leegver 3b pivoted on the top of the housing, as at
the manual knob out of pre-setting position so
The other end ill of bell crank lever 89 may be
long as the sequence switch is not energized. and
pivoted to an intermediate point of fork £32, the
also to hold‘ switch engaged while knob is ole ‘
fork portion of which is arranged to slide in a
pressed for station set-up.
Turning now to the more detailed description 65 groove on stud £353 mounted at the rear side of
housing 263. , $ecured to the forward end of fork
I of the construction and operation of our tuner,
62 there may be provided pointer 636,; which co
the mechanism is housed within a suitable cas
operates with a dial indicated in dotted lines.
‘ ing 2d, preferably of metal, generally rectangular
A clutching engagement between sleeve 2M and
in shape, and of approximately the dimensions
indicated on the drawings, which are actual size. 70 ‘sector it is normally provided by means of a piv~=
oted pressure bracket [3b (Fig. ii, Fig. 12) pivotally
Extending through the housing we provide
mounted on stud lit for a slight rotary movement
manual tuning shaft the, the outer extremity of
in the plane of the paper except when the sole
which carries manual tuning knob it.
' lock it may be mechanically tied to the sequence
This shaft is preferably mounted so as to be -
rotatable and also slidable anially. and at its front
noid is operating the tuning. Pressure plate 48 is
maintained in the position shown in Fig. 3 by
2,411,715 4
means of pin 46, which normally presses on the
outer extremity of pressure plate 45, holding sec
tor 25 against rubber tubing 2 la.
For the purpose Of‘DI‘OVidiIig the small amount
of motion necessary to permit clutching and de
clutching of sector 25 to collar Zia, the sector
may be secured to tilt bar end plate 21 by means
lector screw Ha, Mb, I40, lld, He, each pin
riding in its respective slot.
To limit the backward adjustment of each
screw. we may provide a circumferential groove
92 at the rear end of the turret in which we may
place spring retaining ring 93. To remove any’
screw, ring 83 is removed, after which rotation of
of the small spring plate 49. When the solenoid ’ the adjusting nut works the screw out of the holes
operates, pin 46 is moved forward, coming oppo
in flanges 50 and 5|.
site depressed portion 50 of pressure arm 45. 10
It will be observed by reference to Fig. '7 that
Pressure is no longer applied to sector 25, and the
contact rod lid of the tilt bar engages the bot-v
latter, moving slightly counter-clockwise, springs
tom selector screw, whereas upper bar l2b does
out of contact with sleeve Zia, permitting the
not engage any selector screw, but always engages
tuning of the receiver without driving gear 2| and
the front or hub l3a of the turret. To prevent
manual tuning shaft I5a.
15 contact between the two top selecting screws and
At the same time, the constant clutching en
the top of rod 621), which might otherwise occur
gagement between sector 25 and sleeve tic, ex
if the selecting screws projected out too far, rod
cept when the solenoid is being operated, permits
t?b may have notches formed in it to prevent
manual tuning at any time without the necessity
contact and jamming, as shown in Figs. 9 and 10.
of performing a special operation on the tuning
Mechanical power for the sequence tuning op
shaft. or pressing a manual button as has hereto
eration may be supplied by solenoid 54, having
fore been necessary in all such apparatus with
slidable core 56a. When the solenoid is energized,
which we are familiar, nor does manual tuning
core 5%, normally in the full line position of
interfere with the sequence tuning operation, be
Fig. 6, is drawn intothe dotted line position.
cause, no matter what the initial position of the
apparatus may be, operation of the turret to se
lect a particular pre-set station will always set
the apparatus to tune to that station.
The core may have a slot out near its end as at
be control‘ed by its particular adjusting gear nut
59a extending inwardly from the top of the hells
ing and engaging corresponding key slots 68a,
66b, Bile, 66d, and tile in the rim of‘ ?anges 5i}
541) for engaging cross member 55 of ball 58, piv
oted as at 56c and 581) on housing 2!], spring
biased to full line position as by means of springs
The structure by which this is accomplished
51 and 58.
will now be described. Mounted on carrier rod 30
As will be observed from Figs. 2 and 5, the turret
22 for both endwise sliding movement and rota
may have a groove 59 formed near its rear end
tion, we provide turret l3. This turret has cen
and cross member 55 of bail 56, which is slightly
tral hub iiia and surrounding it with their axes
offset at one end, passes through this groove.
parallel to carrier rod 22 we have provided a
When the solenoid is energized and its core moves
. number of selector screws l4a, 14b, i4c, “ti/and
to the dotted position shown in Fig, 6, bail 5%
l4e, spaced equiangularly around turret iii. In
is carried to the dotted position shown in Fig. 6,
the embodiment shown there are five of these se
and the engagement of cross member 55, lying
lector screws whereby the tuner may be pre-set
in groove 59 in the turret, carries the turret to
or calibrated for five different stations.
the forward position shown in Fig. ‘7, whereby
It will be understood, however, that if desired, 40 the tilt bar is swung to the position determined
a larger or smaller number of selector screws
by the adjustment of the adjusting screw in
may be provided‘. to accommodate a larger or
contact with contact rod iZa of the tilt bar.
smaller number of stations.
In order to prevent possible mistuning or jam
Each of the screws passes through a suitable
ming of the apparatus, which would result if the
opening in ?anges 50 and 5| of turret l3, and
turret moved forward while out of position with
the longitudinal adjustment of each screw may
respect to its rotation, we prefer to provide key
16a, I62), I60, ltd, and We, internally threaded
to engage the threads of its respective screw, and
positioned at an intermediate point on its re 50 and 5i.
It was previously stated‘ that on the return
spective screw, held against accidental disturb=
half of the turret stroke the turret is given one
ance by means of anti-friction washers 53a, 53b,
53c, 53d. and 836.
step of rotation to index it to the nextstation.
The outer surfaces of gears‘ 52a, 52b, 52c, 52d,
In this particular embodiment, with provision
and 52a have teeth of the pitch to engage with Mi for ?ve stations, the amount of rotation intro
duced on each stroke will be 72°, but in any case
tubular gear ll when the turret is in the for
it will. be equal to 360° divided by the number of
ward extremity of its position and manual shaft
15a is pushed inwardly. When this occurs, rota~ ‘ stations which the apparatus can handle.
The structure by which this rotation is accom
tion of shaft i511 rotates adjusting nut ita, i622,
iBc, iSd, or Hie, as the case may be, and thereby W plished will now be described. Referring partic
moves the particular screw forward or backward
in the turret.
ularly to Figs. 5 and 8, it will be observed that
there are five pins, tic, Gib, tile, did, and tie,
projecting rearwardly from the rear face of the
To facilitate assembly and adjustment or", the
screws Mia, Mb, M0, M42. and its, each of the as turret, these being spaced at the same radial dis
tance from the center and spaced apart by equi
holes in ?anges 5d and 5t are preferably reamed
angular distances, in this case 72°.
out, and the screws themselves are preferably
Positioning pawl 62 is mounted for oscillation
ground to provide an accurate, smooth fit and
on bushing the on the rear face of the housing.
prevent undue backlash or play of the screws in
This is provided with pressure face 64 turned
the turret. To prevent rotation of the screws 70 over in position to be engaged by actuating screw
when the adjusting nut is turned, we prefer to
85 carried by ball 56. The pawl 62 terminates
provide a series of longitudinal slots We, 96b, 90c,
at its outer extremity in a wedge-shaped nose
90d, and Bile (Figs. 2, 8) extending from the rear
portion 61 adapted to ?t between any two adja
of the turret to ?ange 50, and a corresponding
cent pins such as 6 lo and 6 Id. This pawl is spring
key pin 98a, 9lb, Slc, Sid. and Me. in each se 75 biased counter-clockwise by means of spring 68,
having one end secured to the. housing and the
provement, or combination which we claim as
other end secured to some part of the free end.
It will be observed that there is a slight clear
our invention or discovery. P
While we have shown and described certain
‘ preferred embodiments 01' our invention, it will
. ance provided between adjusting screw 65 and
be understood that. modi?cations and changes
may be made without departing from the spirit
pressure plate 64. This is provided so that as ball
58 swings, the turretwill ?rst be moved forwardly
to clear pins 6 lo and 8ld from pawl 62 before the
and scope thereof, as will be clear to those‘skilled
latter is swung clockwise by the engagement of '
screw 65 with pressure plate 64. As the bail con
in the art.‘
We claim:
tinues to swing under the pull of the solenoid, 10. - 1. In a sequence tuner, in combination, a po
sitionable element, a tilt bar connected thereto
pawl 62 rotates clockwise to ‘the position shown
for actuation thereof, a turret, mounted for. ro
in Fig. 8 and is latched in this position by spring
tation and axial translation, engaging said tilt
latch 89, the head of which may project inwardly
bar on opposite sides of the tilt bar axis of rota
through opening 10 in the housing.
Latch '69 is normally held in the position shown 15 tion and setting‘ it to one of a predetermined
series of angular positions, and means for im
in Fig. 11 by engagement of one of the pins Gla,
parting a work. and indexing stroke to'said tur
Gib, 6lc, Sid, and Me against its latch‘ end, but
’ ret, said .work stroke being an axial translatory
as the turret moves forward the-latch end moves movement, and said indexing stroke being a pre
in; and when lever 62 clears it, the latch takes
the position shown in Fig.- 11, holding lever 82 20 determined increment of rotation.
‘ 2.--The combination claimed in claim 1, in
in the position shown in Fig. 8 until the turret
which said turret carries 'a number 01' adjustable
again returns. When this occurs, the latch spring
elements for engaging one side of said tilt bar,
is pushed backwardly as in Fig. 12, and it will
and a non-adjustable portion engaging the other
be noted that when the latch ?nally releases
lever 82, its nose 69a is now in position to engage 25
the next pin of sequence Bla, Gib. Bic, Sid, and
side of said tilt bar.
3. The combination claimed in claim 1, in
which said turret carries a number of adjustable
elements adjacent its periphery for engaging one
When the latch ?nally releases lever 62, the
side of said tilt bar, and a non-adjustable Portion
pressure of spring 68 restores lever 62 tolthe posi
to the center of rotation of said turret for
tion shown in Fig. 5, rotating the turret through 80 closer
engaging the other side of said tilt bar‘.
72°. Thus, if the apparatus started in the po
4. The combination claimed in claim ,1, in
sition shown in Fig. 5 with pin Bid at the bot
which the tilt has two engageable portions‘ at
tom, in the last portion of the return stroke lever
diiierent distances from the center of rotation
82 will rotate turret one step counter-clockwise,
of the tilt bar, and in which said turret carries’
as seen in this ?gure,and Blb will now be at the 35 a number of adjustable elements vifor engaging
’ bottom. Each successive operation of the sole
one side of said tilt bar, and a non-adjustable
noid will thus cause tuning to the station next
portion for engaging the other side oi’ said tilt bar.
on the tuning cycle and on the return stroke of
5. The combination claimed in claim 1, in which
the turret it is rotated by the amount necessary 40 saidturret carries a number of adjustable ele- '
to index for the following station.
mentsfor engaging said tilt bar, said elements .
All that now remains ‘to be described is‘ the
being longitudinally adjustable, but ?xed against
action of the interlock, which prevents pushing
the manual tuning shaft into calibrating posi
6. The combination claimed in claim 1, in‘which
tion except when the solenoid is energized. For 45 said turret carries a number of adjustable ele
this purpose the sequence switch indicated diaa .
ments for engaging said tilt bar, said elements
grammatically as 10 may have operating plunger
being longitudinally adjustable, but ?xed against
‘ll provided with knob or button 12. Plunger,“
may extend through the switch and project from .
the rear thereof, where it may be pivoted to bell
crank lever 13 pivotally secured to any suitable
mounting bracket.
The free end 14 oi.’ bell crank lever 13 may
normally abut against manual tuning shaft-alto,
rotation, and each provided with an adjusting
nut intermediate its ends arranged for rotation
‘ ~to eifect longitudinal adjustment of its element.
7. The combination claimed in claim 1, in which .
said turretcarries a number of adjustable ele
ments for engaging said tilt bar. said elements
being longitudinally adjustable, but ?xed against .
and the latter may be provided with collar ‘I5 se
rotation, and each provided with-an adjusting
cured thereto, which ordinarily engages end '14 '55 nut intermediate its ends arranged 'for rotation
of bell crank lever 13, and prevents inward dis
to effect longitudinal adjustment of its element,
_ placement-oi the manual tuning knob.
said adjusting nuts being provided with external
When, however, the operator depresses knob
gear teeth, a manual tuning shaft carrying a driv
12 to closeswitch 10, ball crank lever 13 is ro 60 ing gear, one of said adjusting nuts meshing with
tated clockwise by an amount sumcient to clear . said driving gear when the turret is at the end
collar 15, and manual tuning shaft Ilia may now
of its work stroke.
be pushed inwardly to engage tubular gear ll '
8. The combination claimed in claim 1, in which
with any one of the adjusting nuts. Upon re
lease of the manual tuning knob and of the se
quence switch knob, bell crank lever 13 and tun
ing shaft l5a return to the position shown in
Fig. 1, locking the tuning shaft against inward
‘ said turret carries a number of adjustable ele
65 ments for engaging said tilt bar, said elements
being longitudinally adjustable, but ?xed against
rotation, and each provided with an adjusting
nut intermediate its ends arranged for rotation
In the speci?cation we have explained the 70 to e?ect longitudinal adjustment of its element,
said adjusting nuts being provided with external
principles of our invention and the best mode
gear teeth, a manual tuning shaft carrying a drivi
in which we have contemplated applying those
ing gear, one of said adjusting nuts meshing with
‘principles, so as to distinguish our invention
said driving gear when the turret is at the end
from other inventions; and we have particularly
pointed out and distinctly claimed the part, im 75 or its work stroke, and said manual tuning shaft
being axially movable to mesh said driving gear‘
and one of said adjusting nuts.
9. The combination claimed in claim 1 with a
a manual shaft normally clutched to said tilt bar,
and means for declutching said shaft when said
turret is performing a work stroke.
10. The combination claimed in claim 1 with a
manual shaft normally clutched to said tilt bar,
11. The combination claimed in claim 1 in
which the means for imparting an indexing stroke
to said turret includes a spring-biased pawl en
gaging the turret, means for shifting said pawl
after predetermined axial movement of said tur
ret, means for latching said pawl in shifted po- >
sition, and means for releasing said pawl as the
turret returns to starting position to permit said
a switch for-controlling the work stroke of said
pawl to rotate said turret to a new position.
turret, and an interlock preventing axial move 10
ment of said shaft except when said switch is ‘in
position to impart a work stroke to said turret.
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