Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS1956350 A
Publication typeGrant
Publication dateApr 24, 1934
Filing dateJan 19, 1934
Priority dateJan 19, 1934
Publication numberUS 1956350 A, US 1956350A, US-A-1956350, US1956350 A, US1956350A
InventorsHammond Laurens
Original AssigneeHammond Laurens
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electrical musical instrument
US 1956350 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Aprilv 1934- L. HAMMOND 1,956,350

ELECTRICAL MUSICAL INSTRUIENT Filed Jan. 19, 1934 18 Sheets-Sheet gra- April 24, 1934. 1.. HAMMOND ELECTRICAL lusIcAL ms'raulzu'r' Filed Jan. 19 1934 m mm QM whw Rm mun QQ m f l j w 1 F9 3 a mm L c QM. h Q wwm QRQ N %%N\ April 24, 1934. 1.. HAMMOND ELECTRICAL MUSICAL INST-RUIENT 3 J m m Nwm e m 7 4 w m Rw MN Nmw a 4 m W W %N% April 1934- HAMMOND 1,956,350

ELECTRICAL MUSICAL INSTRUMENT Fi-ledJan. 19, 1934 18 Sheets-Sheet 4 o N N N N N Q E4 2 Q A ril 24, 1934. L. HAMMOND ELECTRICAL MUSICAL INSTRUMENT Filed Jan. 19, 1934 18vSheetsSheet 5 www April 24, 1934. L. HAMMOND ELECTRICAL MUSICAL INSTRUIENT.

Filed Jan. 19, 1934 18 Sheets-Sheet s NQR QN WWW WNW NEW

Nww MW mwm WWW QR w ww a mu m mw m ww mm 9% wmw Q MW Nww \W WWW www was @NN BMW WNW.

April 24, 1934. 1.. HAMMOND H ELECTRICAL MUSICAL INSTRUIENT Filed Jan. 19, 1934 18 Sheets-Sheet 7 Filed Jan. 19, 1934 1a Sh'ets-Sheet 8 jam g f 3142 586 K3142 Q 4 fixazrezzs mozznf r I Q E {y %,)hadu m April 24, 1934.

L. HAMMOND ELECTRICAL MUSICAL INSTRUIENT Filed Jan. 19, 1934 .18 Sheets-Sheet 9 z w 6 0 2d 0 a 'IIIIIIIIIIIIIIIIIIIIIII =5 7 H .kzzfrxm acrezzs 1%] )mdu Zac

April 24, 1934. L. HAMMOND 1,956,350

ELECTRICAL MUSICAL INSTRUIEN'! Filed an. 19, 1934 18 Sheets-Sheet 1o i fidezaifi Laazrezzs fQM/ZUM Z629 1230 526 plig y j zf April 24, 1934. HAMMOND 1,955,350

I ELECTRICAL IUSICAL IN STRUK ENT Filed Jan. '19. 1934 I ls'sneets-sneet 11 2Z6 gr'g 660 673 6 7] 671 7.5

zazzrezasfimma i April 1934' L. HAMMOND 1,956,350

ELECTRICAL MUSICAL INSTRUIENT Filed Jan. 19, 1954 is Sheets-Sheet' 12 April 1934? L. HAMMOND: v 1,956,350

ELECTRICAL HUS ICAL INSTRUIBNT File'd Jan. 19. 1934 fishnets-sheet 1s JGZ April 24, 1934. L. HAMMOND 1,956,350

' ELECTRICAL MUSICAL ms'riwlfiu'r Filed Jan. 19. 1934 is Sheets-Sheet 14 gawafm 2%;

April 1934- L. HAMMOND 1,956,350

ELECTRICAL MUSICAL INSTRUIENT Filed Jan. 19, 1934 18 Sheets-Sheet 15 UPP R III/Ill April 24, 1934 L. HAMMOND 1,956,350

' ELECTRICAL MUSICAL INSTRUIBNT Filed Jan. 19, 1934 Sheets-Sheet 16 ix/6222212 @QIPZZSMJZJ A P 1934. L. HAMMOND 1,956,350

ELECTRICAL IUS ICAL IN STRUIEN'I' Filed Jan. 19, 1954 is Sheets-Sheet 11 72 ROTOR 5 sk m 3Q Patented Apr; 24,


1934, Serial No. 707,280 I Application January 19,

74 Claims.

duced by synthesis of the fundamental tone with J various proportions of its harmonics.

I am aware that various attempts have been made in the past to produce an instrument of this but as far as I have knowledge, none of these attempts accomplish the desired result 10. because of will hereinafter be more fully discussed. 16 I It is a well known fact that any sustained musical soundcan be analyzed into sine wave complitude and various amplitudes of different harmonies of the fundamental. It has been found that in most musical tones the predominant harmonies are those of the lower frequencies, and that harmonics above the eighth have very little effect in characterizing the tone, especially in the middle and upper registers of a higher order would lie above the range of audibility.

Thus most musical tones may be produced by definite combinations of\ the fundamental tone with various proportions of the first eight hars monies I iihe instrument of my invention employs the tempered musical scale not only in the production of the fundamentals but in the production of the various harmonics. As a result any desired chords may be played ble beats. It is thus the primary object of my invention A0 to provide an electrical instrument for the produetion of musical tones upon which any desired musical composition may be played. Incident to this broad object of my invention. are numerous other objects, the attainment of which contributes materially to the'achievement of the primary object. These objects appear more fully in the accompanying specification, and include the following: J

(l) To provide an improved means for gene'i) crating a plurality of currents of'diflerent'frequencies capable of being translated into musi -cal sounds.

l2) To provide improved means for driving such generators at a constant speed. A

515'. ('3) To provide improved circuits by which cupwhere harmonics without causing audi- Y rents from various or synthesized.

generators may be combined (4) To provide improved means for eliminating the in the (5) To provide noise produced upon completing and breakthe various circuits, sometimes referred to as' key thump or key click" noise.

an improved electrical circuit wherein a plurality of currents from dlfierent sources may be combined additively without appreciable cancellation or subtraction.

(6) To provide an electrical circuit in which selected proportions of electrical energy derived from sources 0 bined.

different frequencies may be com- I (7) To provide selective means for changing 7 the quality of the tones produced by the instrum'ent.

(8) To provide selective means for changing the drawn relative proportions of the electrical energy from the generators of the fundamental and the various harmonics thereof.

(9) To provide selective means for simultaneously determining the quality of all of the tones.

produced upon depression of the keys of a manual.

of a plurality of preselected qualities.

(11) To provide means for easily changing said preselected qualities of tone.

(12) To provide rents produced by for due

(14) To provide ing means for adjusting the curthe generators to compensate unavoidable defects in the means ultilized to .translate the currents into sound.

(13) To provide of generators of different frequencies which rean arrangement of a plurality to es inductive coupling between the generators.

an improved means for drivthe generators at the different speeds required for the generation of the currents of different frequency. (15) To provide improved means for producing tremolo effects.

(16) To provide improved methods of wirmg the duetors resi (17) To provide whi (18) To provide her changing the quality of the tones produced by playing upon the instrument wherein a number of the conserve as a means for introducing high stances into the circuit.-

an instrument of the type ch is relatively light in weight and is portable.

an instrument having a numof-key manuals with improved meansfor 105 different manuals.

(19) To produce similar generators for a plurality of different frequencies-in which compensati on may readily be made to cause the currents 11o produced by the generators when translated into sound to be of equal volume.

() To provide a plurality of generators of currents of different frequencies in which a single' countershaft comprising a plurality of articulated sections is utilized for driving all of the generators. l

(21) To provide a bank of generators for currents of different frequencies in a plurality of flexibly connected units, eachunit including a plurality of generators of frequencies which are exact multiples of one another and each unit being shielded from the remaining units.

(22)To provide a plurality of generators for producingcurrents of different frequencies, made up of a plurality of similar units 'in which the rotor shafts of successive units are staggered relative to one another so that the rotor shafts of adjacent units may have a bearing in common.

(23) To provide an improved resilient driving 6 connection between the synchronous motor and the generators.

(24) To provide an improved gearing arrange- ,ment for driving the rotors of the generators at the required speed.

(25) To provide an instrument in which chords may be played and in which all of the electrical current of the same frequency. whether utilized in the various tones as fundamentals or as harmonies is derived from a common source.

(26) To provide an instrument in which diminution of the output derived from a given generator is obtained by a method which decreases the impedance of the output circuit.

(2'7) To provide an instrument having a plurality of keyboards in which there is a duplication of tone range and in which tones of different quality may be controlled by the different keyboards, in such manner that the depression of corresponding keys on two or more keyboards will result in a true combination of the individual tones produced thereby, without substantial energy loss.

- (28) To provide an instrument having a plurality of alternating current generators of different frequency capable of generating relatively strong currents and by suitable resistances decreasing the actual currents utilized to a relatively small percentage of the possible output of the generators, combining the currents produced by various selected generators in predetermined relative proportions, and amplifying the composite current and translating it into sound.

(29) To provide means for compensating for the differences in the energy of the currents produced by the generators of different frequencies.

Other objects are the provision of an electrical musical instrument which may be economically produced in large quantities, in which there is a relatively small number of parts, in which the various elements may be readily assembled, and which will be durable.

Further objects will appear from the following description, reference being had to the accompanying drawings, in which:

Fig. 1 is a plan view of the instrument;

Fig. 2 is a horizontal sectional view showing the pedal keyboard and swell pedal;

Fig. 3 is a vertical cross-sectional view of the upper and lower manuals and the generator assembly;

Fig. 4 is an enlarged vertical sectional view of the assembly of the generators;

Figs. 5, 5a and 5b together constitute a plan viewof the assembly of generators and the synchronous motor for driving the same, various sections and the flexible coupling connecting the countershaft sections;

Fig. 10 is a fragmentary sectional view taken on the line 10-10 of Fig. 8;

Fig. 11 is a right side elevation of the synchronous motor, various parts associated therewith being broken away to show detail, the view being taken substantially on the plane of line 11-1l of Fig. 6;

Fig. 12 is a vertical sectional view-of the synchronous motor taken on the line 1 2-12- of Fig. 6;

Fig. 13 is a fragmentary plan view of a section of multiple contact switches, parts thereof being shown in fragmentary section;

14 is a fragmentary vertical sectional view taken on, the line 14-14 of Fig. 13;

Fig. 15 is a fragmentary sectional view illustrating the method by which the switch contact members are mounted;

Fig. 16 is a fragmentary sectional view taken on the line 16--16 of Fig. 13, illustrating the means by which the switch actuator is connected to the switch contact members;

Fig. 17 is a transverse sectional view taken on the line 17-17 of Fig. 13;

Fig. 18 is a vertical sectional view of the timbre selector mechanism;

Fig. 19 is a sectional -view taken on the line 19-19 of Fig. l8;'

Fig. 20 is a vertical sectional view of the pedal keyboard taken on the line 20--20 of Fig. 2;

Fig. 21 is a plan view of a portion of the pedal keyboard with the pedals removed;

Fig. 22 is a vertical sectional view of the swell pedal and associated mechanism taken on the line 22-22 of Fig. 23;

Fig. 23 is a vertical sectional view of the swell pedal mechanism taken on'the line 23-28 of Fig. 22;

Fig. 24 is a vertical sectional view of the stop 'key operated pre-set combination selector;

Fig. 25 is a fragmentary plan view of the mechanism shown in Fig. 24,- various parts be-- ing broken away to show the details of construction;

Fig. 26 is a vertical sectional view of the instrument taken just inside the right-hand side wall and showing the general arrangement of v the mechanism Figs. 27' and 27a, together constitute a schematic wiring diagT J of the instrument; and

Figs. 28 and 28a constitute a chart usable in conjunction with the wiring diagram to indicate the connections not shown in the diagram and setting forth the numbers of teeth, etc., in the various gearing utilized to drive-the generators.

General description The detailed description of the instrument of my invention will, I believe, be more readily understood if it is read with a previous general

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2432500 *Jul 1, 1942Dec 16, 1947Aga Baltic AbEarth inductor generator
US2455032 *Sep 17, 1947Nov 30, 1948Alfred O WilliamsMusical instrument
US2471534 *Mar 29, 1943May 31, 1949Muth Jr JohnMusical instrument
US2474960 *Apr 28, 1945Jul 5, 1949Nat Union Radio CorpElectronic device and circuit arrangement therefor
US2475168 *Jan 28, 1943Jul 5, 1949Workman Ernest RobertMusical instrument
US2501050 *Jun 16, 1947Mar 21, 1950Abe FranklRadio receiving apparatus in a miniature piano cabinet having movable keys
US2508514 *Feb 27, 1948May 23, 1950Hammond Instr CoElectrical musical instrument
US2539130 *Mar 4, 1948Jan 23, 1951Maurice GrudinElectrical musical instrument
US2565512 *Jun 13, 1949Aug 28, 1951Hammond Instr CoTone control apparatus for electrical musical instruments
US2577752 *Aug 22, 1949Dec 11, 1951Hammond Instr CoTone quality control circuit for electrical musical instruments
US2595518 *Aug 9, 1946May 6, 1952Ford Motor CoTesting apparatus
US2599999 *Aug 23, 1946Jun 10, 1952John W JacksonKeyboard for musical instruments and keys therefor
US2607444 *Aug 1, 1950Aug 19, 1952Patent Man IncMagnetic brake for tremolos
US2625070 *Jun 19, 1951Jan 13, 1953Central Commercial Ind IncPedal keyboard
US2699085 *Oct 12, 1949Jan 11, 1955Wurlitzer CoCombination stop action
US2734416 *Aug 26, 1950Feb 14, 1956The Baldwin Piano Companycorwin
US2736223 *Aug 2, 1951Feb 28, 1956 Seybold
US2946253 *Oct 31, 1955Jul 26, 1960Clark Jr MelvillePhotoelectric apparatus for generating musical tones
US2989886 *May 15, 1959Jun 27, 1961Allen Organ CoElectronic organ and the like having chiff and other tonal characteristic producing means
US3013462 *Apr 3, 1958Dec 19, 1961Sr Frayne L CombsChord selectors for chord organs
US3046826 *Jul 7, 1958Jul 31, 1962Justin A KramerSingle keyboard electronic carillon
US3056326 *Jun 11, 1958Oct 2, 1962Rene SeyboldTimbre-selector for a musical synthesizer
US3074305 *Sep 8, 1959Jan 22, 1963Scope IncOrgan vibrato control
US3106618 *Jan 25, 1960Oct 8, 1963Baldwin Piano CoMutually exclusive stop switch mechanism
US3179812 *Jul 25, 1961Apr 20, 1965Hammond Organ CoSine wave divider for electrical musical instruments
US3251925 *Feb 12, 1962May 17, 1966Burchfield Jack EElectric organ with tremulant effect
US3469135 *Mar 24, 1967Sep 23, 1969Hammond CorpTone signal generator
US3513247 *May 2, 1967May 19, 1970Chicago Musical Instr CoPhotoresistor swell control for a musical instrument
US3636231 *Apr 19, 1971Jan 18, 1972Hammond CorpDc keyed synthesis organ employing an integrated circuit
US3748944 *Sep 29, 1971Jul 31, 1973Hammond CorpIntegrated circuit synthesis and bright wave organ system
US3878749 *Dec 12, 1972Apr 22, 1975Allen Organ CoWalsh function tone generator and system
US4218950 *Apr 25, 1979Aug 26, 1980Baldwin Piano & Organ CompanyActive ladder filter for voicing electronic musical instruments
US4409877 *Jul 14, 1981Oct 18, 1983Cbs, Inc.Electronic tone generating system
US4653375 *Aug 14, 1985Mar 31, 1987Victor Company Of Japan, Ltd.Electronic instrument having a remote playing unit
USRE31653 *Sep 30, 1982Aug 28, 1984Nippon Gakki Seizo Kabushiki KaishaElectronic musical instrument of the harmonic synthesis type
DE2219559A1 *Apr 18, 1972Nov 2, 1972 Title not available
U.S. Classification84/601, 84/DIG.400, 200/17.00R, 84/715, 307/27, 84/DIG.250, 307/1, 84/433, 310/170, 984/355
International ClassificationG10H3/00
Cooperative ClassificationY10S84/25, G10H3/00, Y10S84/04
European ClassificationG10H3/00