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Патент USA US3068745

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Dec. 18, 1962
'
w, J, ANDERSON
'
3,068,735
ELECTRICAL MUSICAL INSTRUMENT COUPLING SYSTEM
Original Filed March 1'7, 1958
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2 Sheets-Sheet 1
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Dec. 18, 1962
w. J. ANDERSON
3,063,735
ELECTRICAL MUSICAL INSTRUMENT COUPLING SYSTEM
Original Filed March 1'7, 1958
2 Sheets-Sheet 2
FIG. 2
INVENTOR.
WalTeR J Amdeksq'n
2mm
BY
QM
United States Patent O?hce
1
3,0li8,735
Patented Dec. 18, 1962
2
3,068,735
ELECTRICAL MUSICAL INSTRUMENT
COUPLKNG SYSTEM
Walter .I. Anderson, Elgin, 111., assignor to The Lowrey
. Organ @ornpany, Cool»: County, 111., a corporation of
Illinois
Continuation of appiication Ser. No. 721,8tl1, Mar. 17,
1958. This application Oct. 25, 19619, Ser. No. 64,814
10 Claims. (Cl. 84-117)
This invention is a continuation of my co-pending ap
plication Serial No. 721,801, ?led March 17, 1958.
This invention relates to a mechanism for coupling one
manual of an electronic organ to another.
The primary object of the invention is the provision of
simple and dependable means for avoiding electrical in
teraction between the various voltage carriers of an elec
tronic organ for improved tonal clarity and de?nition
upon translating tone signals into audible sounds for
musical expression.
bar, and this is also true with respect to the lower manual
switches. In each case, the bus bar will be connected
to a source supplying activating potential thereto.
Similar elements throughout the several illustrated
forms of my invention will be designated by like reference
characters and numerals.
Referring to FIGURE 1A, G2 is a tone signal gener
ator comprising a vacuum tube operating at any desired
musical frequency, said tube having an anode A, cathode
10 B and control grid C.
K1 is an upper manual key and K2 a lower manual
key, the former connected by sticker 10 to one end of
a contactor 11 and the latter connected by a sticker 10'
to a contactor 14. As shown, said keys are normally
biased to raised position by springs Y.
A conductor section 12 has one of its terminals con
nected to anode A and its opposite terminal to contactor
11 through a load resistor R1. Conductor section 16 con—
nects at one of its terminals to contactor 14, the opposite
terminal thereof connected to contact 15 situated be
In organs employing tone generators adapted to be
neath contactor 11 and engaged therewith only when key
activated by voltage applied thereto for transmission of
K1 is raised, as shown, at which time, sections 12 and
16, contactors 14 and 11 and contact 15 complete one
continuous conductive path to anode A.
tone signals to an output system, it has been costly with
prior instruments satisfactorily to prevent electrical inter
action between interrelated and interconnected circuit ele
ments and voltage carriers. Such electrical interaction
is proportional to the voltage applied at any instant to
the playing key switches. In the instant case, we are con
S1 is a common conductor, one terminal of which con
nects to header H1 of a system T of upper manual
“stops” S which connect to respective wave ?lters F.
These ?lters connect to common output header H2, the
latter connected by wire S2 to ampli?er S3 of any con
cerned with the relationship to each other of the switch
assemblies and associated circuit elements, each assembly 30 ventional electroacoustic translator, the ampli?er having
consisting of a longitudinal row of switches which are
a loud speaker S4. The opposite terminal of conductor
S1 connects to conductor section 12 via resistor R3 and
operable by a similar order and relationship to each other
of the playing keys of the respective manuals. It follows
‘condenser C1, the point of said connection being between
that when playing complicated chords on one or both
the anode A of generator G2 and load resistor R1.
manuals voltage applied at the same instant to a large
number of switches can cause interference with nearby
23 is a bus bar which will have as many contacts as
the one shown at 24 as there are playing keys like key
switches with attending introduction of disturbing ex
traneous frequencies and tonal impairment of sound at
the reproducers in the output system of the instrument.
K1, and, as shown, contact 24 is disposed in spaced apart
relation to contactor 11 when key K1 is raised. Bus bar
My invention is therefore a means for satisfactorily over
volts.
coming the herein stated difficulties by simple and inex
pensive procedures.
23 connects to a source of B+ potential 25 of 180
Located above contactor 14 is a bus bar 17 which will
also have as many contacts like contact 18 as there are
A furthcr object is the provision of means whereby
lower manual keys such as key K2. Contact 18 is con
sounds at the translator can either be made to decay
nected to a similar contact 19, the latter forming an ele
rapidly or be sustained for a de?nite period of time, 45 ment of a coupler switch comprising a pivoted blade 21
which said means enables producing versatile sound effects
which connects to a source of B-l- potential 22 of 180
at any instant when playing either one of the manuals.
volts.
Other objects will be pointed to in the following de
At FIGURE 1C both keys K1 and K2 are shown de
pressed. Contactor 11 is engaged with contact 24 and
scription of my invention, reference being had to the ac
50 disengaged from contact 15. Contactor 14 is engaged
companying drawings in which:
voperated condition of the coacting elements of the in
with contact 18 and blade 21 is disengaged from con
tact 19.
vention.
FIGURE 1B is a schematic illustration showing an
At FEGURE 113, key K1 is raised and contact 15 is
engaged with contactor 11 and disengaged from contact
FIGURE 1A is a schematic illustration showing one
other operated condition of the coacting elements of the 55 24'. Key K2 is depressed thereby engaging contactor 14
with contact 18. Blade 21 is closed against contact 19.
invention.
FIGURE 1C is a schematic illustration showing a still
It follows upon referring to FIGURE 1A that keys K1
further operated condition of the coacting elements of
and K2 being raised and blade 21 of the coupler switch
the invention.
v
FIGURE 2 is a schematic illustration of a further em
bodiment of the invention, and
FIGURE 3 is a schematic illustration of a still further
embodiment of the invention.
While the accompanying drawings show only a single
moved off of contact is, the respective bus bars 17
60 and 23 are completely electrically isolated from each
other, thereby preventing electrical interaction between
them and other closely related voltage carriers. In this
condition of the described elements, depression of key K1
causes engagement of contactor 11 with contact 24 with
tone signal generator, an upper manual switch and a lower 65 resulting transmission of activating potential to anode A
manual switch, each switch being coactive with a contact
of generator G2 from source 25 of B+ potential of
on a respective bus bar, it is understood that for each note
180 volts for activation of the generator and withdrawal
in the instrument’s gamut there will be a generator formed
and adapted, when activated by B+ potential, to deliver
a signal of the frequency of one of the notes of the chro
matic scale. In practice, all upper manual switches are
coactive with respective contacts upon a common bus
of the produced signal and delivery of the signal to the
upper manual system of “stops.” When, as shown at
FIGURE 16 both keys K1 and K2 are depressed at
the same time, switch blade 21 being in‘ an open cir
cuited condition, contactor 11 will be disengaged from
A
contact 15 and contactor 14 engaged with contact 18.
8+ potential from source 25 will be delivered to anode
A, thereby completely isolating the switches from each
other, it having been discovered that by this simple means
there is complete avoidance of electrical interaction be
tween all voltage carriers regardless of the number of
switches that are close circuited at any instant, thereby
making for clarity of tones not possible of attainment
with systems of the prior art.
When, as shown at FIGURE 1B, the lower manual
being coupled to the upper manual, it is noted that when
depressing key K2, contactor 14 engages contact 18
which is now close circuited with a source of B-l- poten
tial of 180 volts 22, key K1 being in its raised position,
potential will be applied to anode A via contact 18, con
tactor 14, conductor section 16, contact 15, contactor 11
and conductor section 12. As contactor 11 is off of con
tact 24, bus bars 23 and 17 are completely electrically
isolated from each other.
In the embodiment shown at FIGURE 2, conductor
12 consists of sections 12a and 12b, load resistor R1
in section 12a and load resistor R2 in section 12b, the
lower terminal of section 1217 being connected to con
tactor 14 of the lower manual key K2, and, as shown,
contactor 11 of key K1 connects to junction point P
between said resistors. The upper terminal of section
1211 of. conductor 12 connects to anode A of generator
G2. Source 50 supplies 13-}- potential of 120 volts to bus
bar 23, contact 24 and contact 54. Coupler blade 51
connects by lead wire 52 to bus bar 17 and is adapted,
at the will of the player to be moved either onto contact
54 or onto contact 53, the latter being an element of
bus bar 5t)’ which connects to a source 510 of positive
to blade 67” and the former to contact 54a. Contact
54a is coactive with coupler blade 51a which connects to
a source Siic supplying B+ potential of 180 volts. Bus
bar 230 embodying contact 24a connects to a source
of 8+ voltage 25a of 180 volts. Blade 67” is disposed
in the space between contacts 69a and 70a, the former
adapted to be connected to source 71a supplying 13+
potential of 60 volts to contactor 67" when the latter is
engaged with contact 6%. Contact 70a is adapted to
supply a minus 60 volts of potential to blade 67" from
source 71a when blade 67” is engaged with contact 7t)a.
When blade 51a is on contact 54a and key K2 is
depressed, contactor 66:: engages contact 61a, thereby
delivering 180 volts of B+ potential to glow tube NE2
ionizing same and causing application of activating poten
tial to anode A of generator G2 via resistor R1 and
charging condenser C4 through resistor R4. Assuming
that key K2 has beenreturned to its raised condition,
and that blade 67" is engaged with contact 69a, 60 volts
of B+ potential is applied to glow tube N52 via contact
‘53a and contactor 66a thereby retarding discharge of
condenser C4 for sustaining the tone. When blade 67"
is on contact 70a, negative potential of 60 volts is applied
to said glow tube thereby causing rapid discharge of
condenser C4; and corresponding rapid decay of the tone.
This feature of herein disclosed invention forms the
subject of a divisional application of my earlier ?led
application Serial No. 721,801, ?led March 17, l958,
said divisional application bearing Ser. No. 64,8l8, ?led
Oct. 25, 1969.
What I claim as my invention is:
1. Stop mechanism for an electronic organ having up
per and lower manuals, a vacuum tube generator pro
ducing a. signal of given musical frequency and provided
potential supplying 60 ‘volts. In other respects, the vari
ous elements comprising this embodiment of my inven 35 with a signal output electrode, an upper manual tone
color system providing output signals of the waveforms
tion are similar to corresponding elements disclosed at
of different stops, an ampli?er and associated loud speaker,
FIGURES 1A, 1B and 1C, except that a normally
stop switches operatively connecting the tone color sys
deionized glow tube NE2 is connected in section 12b
tem to said ampli?er, depressible upper and lower manual
contactor 14 of key K2 and is adapted to be connected 40 keys each having a switch actuable thereby, circuitry
connecting said electrode to the tone color system and
either in circuit with source 510 or source 50 according
the lower manual key switch to the upper manual key
as blade 51 is moved onto one or the other of said
switch only when the upper manual key is raised, and
contacts 53 and 54. In this embodiment of my inven—
means for supplying activating potential to said electrode
tion, electrical isolation between bus bars 17 and 24
when depressing the upper manual key and for similarly
is established by the high impedance and non-conductive
supplying activating potential to said electrode when the
characteristics of said glow tube when the tube is deionized
lower manual key is depressed and the upper manual
thereby completely blocking said conductor against ?ow
switch is raised.
of activating potential between said bus bars. With the
of conductor 12 at a point between load resistor R2 and
blade engaging contact 54, 120 volts of B+ potential
will be applied to bus bar 17. When key K2 is depressed,
contactor 14 is energized and glow tube NE2 ionized,
thereby unblocking conductor 12 and applying activating
potential to anode A for withdrawing the signal and
transmitting same to the output system of the instrument.
In this manner, the effective voltage on bus bars 23
and 17 is insui?cient to ionize glow tube NE2, thereby
preventing interaction between the switches and said
bus bars.
-
In the embodiment shown at FIGURE 3 conductor
12 comprises sections 120 and 120.’, the former having
load resistors R1 and R4 and charging condenser C4
and the latter a load resistor R5 and glow tube NE2.
At junction point P2 between resistors R1 and R4, con
tactor 11a. of the upper manual key K1 is connected.
The upper terminal of section 12c connects to anode A
of generator G2, the opposite terminal of said section
connecting to ground through condenser C4. Section 12d
2. Stop mechanism as set forth in claim 1 in which
a high impedance electronic device connects the lower
-manual switch to the upper manual switch and the lower
manual switch to the potential supply means for lowering
the impedance of said device and deiivering activating
potential to said electrode when the lower manual key
is depressed.
3. Stop mechanism as set forth in claim 2 in which
said high impedance device comprises a glow tube wl ‘ch
is deionized when the lower manual switch is raised.
4. Mechanism for coupling the lower manual to the
upper manual of an electronic organ comprising, a vac
uum tube generator producing a signal of given musical
frequency, said generator having a signal output elec
trode, an upper manual timbre control system, an ampli
?er and associated loud speaker coupled to the timbre
control system, depressible upper and lower manual keys
each having a contactor actuable by the key and a con
tact coactive with said contactor, each key being resili
ently biased to a raised position disengaging the contactor
of conductor 12 has a contact 15a which is electrically
coactive with contactor 11a, the opposite terminal of 70 thereof from its coactive contact, circuitry connecting the
electrode to said ampli?er and the contactor of the upper
conductor section 12d being connected to contactor 66a
manual key to said electrode and connecting the contactor
of the lower manual key K2. Said section 120’ has a
of the lower manual key to said electrode only when the
glow tube NE2 connected therein between contactor 66a
upper manual key is raised and the lower manual key is
and load resistor R5. Contactor 66a is disposed in the
space between contacts 61a and 63a, the latter connected 75 depressed, and means for supplying positive potential to
3,068,735
6
5
is connected between the contactor of the upper manual
said contacts for energization of said contactors and con
duction of said potential to said electrode.
5. Mechanism as set forth in claim 4 wherein the cir
key and said glow tube.
10. In an electronic musical instrument, a vacuum tube
producing a tone signal of given musical frequency and
provided ‘with a signal output electrode, upper and lower
cuitry comprises electrically coactive ?rst and second sec
tions, the ?rst section directly connecting the contactor
of the upper manual key to said electrode, the second
section electrically connecting the contactor of the lower
manual key to the electrode via said ?rst section only
when the uper manual key is raised.
6. Mechanism as set forth in claim 5 wherein the sec
manual keys each having a switch comprising a contactor
operated by the key and a contact coactively associated
with said contactor, each key being resiliently biased to
a raised position to disengage the contactor thereof from
10 its associated contact, circuitry in which said contactors
ond section of said circuitry has a contact engaged by
the contactor of the ?rst section of said circuitry when
the upper manual key is raised.
are operatively contained, and means for energizing said
contacts with positive potential, said circuitry connecting
said contactors to said electrode and in operating relation
to their respective contacts to electrically disable the
ond section of said circuitry contains a normally deionized 15 switch of the lower manual key when the upper manual
7. Mechanism as set forth in claim 6 wherein the sec
glow tube for blocking said section against ?ow of poten
tial therethrough when the contactor of the upper manual
key is engaged with its coactive contact and for unblocking
said second section of said circuitry to ionize said tube
to e?ect conduction of positive potential to said electrode 20
when the upper manual key is raised and the lower
manual key is depressed.
8. Mechanism as set forth in claim 5 in which the ?rst
section of the circuitry has a load resistor between the
25
contactor of said section and said electrode.
9. Mechanism as set forth in‘claim 7 in which the ?rst
and second sections of said circuitry each has a load
resistor therein and the load resistor in the second section
key is depressed.
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,103,439
Swart _______________ __ Dec. 28, 1937
2,169,842
Kannenberg __________ __ Aug. 15, 1939
2,513,109
2,811,069
2,823,310
Roth ________________ __ June 27, 1950
Faulkner _____________ __ Oct. 29, 1957
Anderson ____________ __ Feb. 11, 1958
OTHER REFERENCES
Keister et al.: The Design of Switching Circuits, pages
48-49; New York, Van Nostrand Co., 1951.
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