US3740448A - Organ drop-in key assembly - Google Patents

Organ drop-in key assembly Download PDF

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Publication number
US3740448A
US3740448A US00133162A US3740448DA US3740448A US 3740448 A US3740448 A US 3740448A US 00133162 A US00133162 A US 00133162A US 3740448D A US3740448D A US 3740448DA US 3740448 A US3740448 A US 3740448A
Authority
US
United States
Prior art keywords
pivot rod
keys
keyswitch
base
key
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00133162A
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English (en)
Inventor
R Olszowka
H Thomas
R Gong
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TWCA CORP
Original Assignee
Wurlitzer Co
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Filing date
Publication date
Application filed by Wurlitzer Co filed Critical Wurlitzer Co
Application granted granted Critical
Publication of US3740448A publication Critical patent/US3740448A/en
Assigned to FIRST NATIONAL BANK OF CHICAGO, THE, ONE FIRST NATIONA PLAZA, CHICAGO, ILLINOIS 60670 reassignment FIRST NATIONAL BANK OF CHICAGO, THE, ONE FIRST NATIONA PLAZA, CHICAGO, ILLINOIS 60670 SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WURLITZER COMPANY, THE,
Assigned to TWCA CORP. reassignment TWCA CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WURLITZER ACCEPTANCE CORPORATION, WURLITZER CANADA, LTD., WURLITZER COMPANY, WURLITZER INTERNATIONAL LTD, WURLITZER MUSIC STORES, INC.
Assigned to WURLITZER COMPANY, THE reassignment WURLITZER COMPANY, THE CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: TWCA CORP.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H1/00—Details of electrophonic musical instruments
    • G10H1/32—Constructional details
    • G10H1/34—Switch arrangements, e.g. keyboards or mechanical switches specially adapted for electrophonic musical instruments
    • G10H1/344—Structural association with individual keys
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H1/00—Details of electrophonic musical instruments
    • G10H1/32—Constructional details
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S84/00—Music
    • Y10S84/07—Electric key switch structure

Definitions

  • Some means generally is provided forindividually coneluding the keys and key switches.
  • a molded plastic case or housing ofessentially two-piece construction wherein the lower portion is provided with'upstanding studs for receipt of a structure mounting key switches and key biasing springs.
  • the lower portion of the housing further is provided with upstanding saddles and adjacent posts.
  • a plurality of keys is preassembled on a single pivot rod which is then placed as a unit in the aforesaid saddles with the ends of therod adjacent the posts.
  • Spring elipretainers are placed over the tops of the posts to holdthe pivot rod in seated position in the saddles.
  • each key has on the bottom thereof a saddle or actuator with a pair of notches therein respectively receiving the key switches and the biasing springs, whereby the keys are automatically adapted for playing the moment they are inserted in the hous-
  • FIG. 1 is a verticalsectional view through an electronic organ incorporating the prineiplesof the present invention and taken substantially along the line 1-1 in FIG. 2;
  • FIG. 2 is a vertical sectional view taken substantially along the line 2--2 in FIG. 1;
  • FIG. 3 is a horizontal sectional view taken substantially along the line 3-3 in FIG. 1;
  • FIG. 4 is a fragmentary front view as taken substantially along line 4-"-4 in FIG. 3;
  • I FIG. 5 isa'fragmentary end view partially in vertical section as'taken substantially along the line 5-5 in FIG. 3; r r
  • FIG. 6 is a fragmentary vertical sectional view as ings, and first to FIGS. 1-3, there will be seen an elec tronic organ 20 constructed in accordance with the principles of the present invention.
  • the organ is of a portable nature, on the order of a few pounds, and a foot or two in overall length, and ineludes a molded plastic housing or case 22 having a lower portion 24 and an upper portion 26.
  • the lower portion 24 mounts most of the important parts of the organ, and on the outside thereof is provided at the bottom with supporting feet 27 which may be molded integrally with the remainder of the case lower half.
  • a plurality of keys comprising-a shortened keyboard having the usual natural and sharp keys conventionally black and white, respectively, is supported by means hereinafter to be set forth in detail in the lower portion of the case.
  • the upper portion of the case which is connected to the lower portion by means hereinafter to be set forth, provides an opening exposing the keys 28.
  • the upper portion also provides a cover for various controls 30 for turning the power supply on and off, for turning a vibrato on and off, for controlling volume, and for determining the organ voice to be played.
  • the top portion 26 also may be provided with an integral grill section .(not shown) behind which a loud-' speaker is mounted (not shown).
  • the confronting edges of the bottom and top portions of 24 and 26 of the housing 22 are provided with complementary tongue and groove interlocking configurations at 36.
  • a plurality of hollow bosses 38 is provided in the bottom portion 24, and opposed posts 40 are provided in confronting relation therewith. Screws 42 extend up through the hollow bosses 38 and are threadedly received in the posts 40 for retaining the two portions'of the housing in assembled relationship.
  • Additional upstanding posts 44 are provided within the lower housing portion 24 for mounting a panel 46 carrying the controls 30. Adjacent to the rear of the lower portion 24 there is provided a pair of upstanding flanges 48 in parallel, spaced relation for positioning a row of batteries 50 supplying power for the organ. Toward'the right end the portion of the case underlying the batteries 50 is in the nature of a trap door for installing batteries, while to the left the battery area is provided with an upstanding flange 52 (FIG. 3) for properly positioning the batteries. A helical contact spring 54 is provided adjacent to the left end for biassing the batteries into contacting engagement with a fixed contact 56 at the opposite end.
  • the lower portion of the case is provided with further integral protuberances which will be better understood at a somewhat later point.
  • each key is of molded plastic and has a molded plastic keyframe 58 integral therewith including a rearwardly projecting shank 60.
  • each rearwardly pro jecting shank 60 overlies and butts on its underside against a pad 62 of suitable material such as polyvinyl chloride glued or otherwise suitably secured on top of an upstanding rib 64 integral with the bottom wall of the bottom portion 24 of the ease of the housing.
  • a similar downstop 63 is glued to the bottom wall beneath depending forward portions of the keys.
  • Each shank 60 further has an upstanding transverse boss 66 receiving a pivot rod 68.
  • the pivot rod is common to all of the keys and has C-washers 71 received in peripheral slots adjacent to opposite ends thereof to retain the keys assembled on the pivot rod.
  • each key is provided on one side thereof with a spacing protuberance.
  • this comprises partial arcuate protuberance 65 concentric with the pivot rod.
  • a protuberance 67 is provided near the rear or inner end of each key and a protuberance 69 is provided near the outer or front end of each key.
  • the protuberance molded integrally with the key is of small area whereby to form a low-friction engagement with the smooth sidewall of the adjacent key. Accordingly, the keys are self-spacing on the pivot rod 68.
  • a pair of saddles 70 upstands from the bottom wall of the case lower portion, and each such saddle has a notch 72 opening upwardly at its upper end.
  • the pivot rod is received adjacent its opposite ends in the upwardly opening notches 72 of the saddles 70.
  • each saddle 71 Outboard of each saddle 71 there is provided an upstanding post 74 formed integral with the bottom wall of the case lower portion.
  • a spring clip sometimes known as a push nut 76.is installed over thetop of each post 74 in overlying relation with the adjacent end of the key pivot rod 68.
  • the post 74 positions the pivot rod longitudinally of itself, while the push nuts 76 hold the pivot rod down on the saddles 70.
  • each key there is provided a depending transverse saddle 78 each having two downwardly opening notches 80 and 82 therein (FIGS. 2 and 4) for purposes shortly to be described.
  • the bottom wall of the bottom portion 24 is provided with four integral upstanding posts 84 (FIG. 1) intermediate the saddles 70 on which are mounted a printed circuit board 86 having certain electrical components thereon, and also two insulating bases 88, preferably made of a suitable plastic material, the bases 88 and the printed circuit board 86 being held down by screws 90 extending therethrough and threaded into the respective posts 84.
  • the bases 88 each carry a plurality of spaced apart, parallel spring wires 92 extending in the same direction. Each of the spring wires 92 is received in a notch 80 of a respective key saddle 78.
  • the bases 88 carry a plurality of resilient contact wires 94 parallel to one another, and also parallel to and extending in the same direction as the spring wires 92.
  • the contact wires 94 are longer than the spring wires 92, and preferably are of a butt-welded two piece construction as disclosed in Howard G. Bauer U. S. Pat. No. 3,330,916. However, it is contemplated that the contact wires 94 could be stiff enough to act as bearing springs with the discreet bearing springs 92 being omitted.
  • a fixed contact bus 100 comprising a conductive wire member, extends across the saddles 96 and is held in place by heat staking the upper ends of the saddles. As will be seen particularly in FIGS. 1 and 7 the fixed contact 100 is far enough forward that it will be engaged by any one of the contact wires 94 when the respective key is depressed, but will be clear of the corresponding key biassing spring wire 92.
  • the keys are preassembled on the common pivot rod with the C washers 71 retaining the keys thereon.
  • the keys substantially abut one another for positioning by the protuberances 65, 67, and 69.
  • the bases 88 carrying the spring wires and the spring contacts along with the printed circuit boards 86 are simply placed on top of the posts 84 and secured thereon by means of the screws 90.
  • the fixed contact wire 100 is placed on the saddles 96 and heat staked in place.
  • the common pivot rod 68 is placed on the saddles and the push nuts 76 are installed over the posts 74.
  • the notches and 82 in the key saddles 78 engage the spring wires 92 and contact wires 94. Since the sides of the notches taper slightly, the initial positioning need not be perfect.
  • A'keying assembly for an electronic musical instrument comprising a base, keyswitch means supported from said base, key biassing means supported from said base, upstanding support means on said base adjacent to said keyswitch plurality of switch operators each engaging a switch contact member and a spring member from the same side thereof.
  • a keying assembly for an electronic musical instrument comprising a base, keyswitch means supported from said base and comprising a plurality of parallel metal contacts extending in the same direction, key biassing means supported from said base and comprising a plurality of parallel springs extending in the same direction and substantially parallel to the keyswitch contacts, upstanding support means on said base adjacent said keyswitch means, a common pivot rod, a plurality of keys of a keyboard pivotally mounted on said common pivot rod, said support means having edge openings therein transverse to said common pivot rod and said common pivot rod being received and supported in said edge openings of said upstanding support means, said keys each overlying at least one of said springs and one of said keyswitch contacts and in operative engagement therewith for actuation of said keyswitch means contacts and for biassing of said keys to rest position, and means retaining said pivot rod on said upstanding support means, each contact comprising a wire and each spring comprising a wire, and each key having a saddle thereunder with at least two downwardly directed notches respectively engaging
  • a sub-combination for use in an electronic musical instrument keying assembly comprising an insulating base, a plurality of resilient switch contact members extending therefrom in the same direction and parallel to one another substantially in a common plane, a plurality of spring members extending from said base in the same direction and parallel to one another and to said switch contact members substantially in the same common plane as said switch contact members, pairs of spring members and contact members being of relative lengths to be engaged and deflected by a common operator, each contact member extending beyond the respective spring member, and a common bus disposed transversely of said members and positioned for selective engagement by all of said contact members but beyond all of said spring members, and a means, a common pivot rod, a plurality of keys of a keyboard pivotally mounted on said common pivot rod, said support means having edge openings therein transverse to said common pivot rod and said common pivot rod being received and supported in said edge openings of said upstanding support means, said keys co-operating with said keyswitch means for operation thereof and with said key biassing means for bias
  • the method of assembling a keyswitch assembly in an electronic musical instrument which comprises providing a base having a plurality of spaced upstanding support means, each having upwardly opening recess means, positioning a plurality of keyswitch means on said base adjacent said upstanding support means, pivotally assembling a plurality of playing keys on a common pivot rod, and subsequently moving said pivot rod with the keys mounted thereon transversely of said rod and vertically down into the recess means of said upstanding support means with said keys in operative relation to said keyswitch means, and thereafter positioning hold-down means above said rod to hold said rod in said recess means.
  • a keying assembly for an electronic musical instrument comprising a base, support means integral with said base and having edge opening recesses, a common pivot rod, a plurality of keys of a keyboard pivotally mounted on said common pivot rod, said common pivot rod being received and supported by the recesses of said support means, resilient means mounted on said support means and operatively engaged by said keys and deflectible thereby, means upstanding from said base adjacent said support means blocking endwise movement of said pivot rod, means mounted on said last mentioned upstanding means opposite said edge opening recesses retaining said pivot rod on said support means.
  • a keying assembly as set forth in claim 15 wherein the keyswitch means and the key biassing means engagable by each key comprises a common resilient member.
  • a keying assembly for an electronic musical instrument comprising a base, keyswitch means Supported from said base, key biassing means supported from said base, upstanding support means on said base adjacent said keyswitch means, a common pivot rod, a plurality of keys of a keyboard pivotally mounted on said common pivot rod, said support means having edge openings therein transverse to said common pivot rod and said common pivot rod being received and supported in said edge openings of said upstanding support means, said keys cooperating 'with said keyswitch means for operation thereof and with said key biassing means for biassing said keys to rest position, means upstanding from said base adjacent said support means blocking endwise movement of said pivot rod, and means mounted on said last mentioned upstandingmeans opposite said edge opening recesses retaining said pivot rod on said upstandingsupport means.
  • a sub-combination for use in an electronic musical instrument keying assembly comprising an insulating base, a plurality of resilient switch contact members extending therefrom in the same direction and parallel to one another substantially in a common plane, a plurality of spring members extending from said base in the same direction and parallel to one another and to said switch contact members substantially in the same common plane as said switch contact-members pairs of spring membersand contact members being of relative lengths to be engaged and deflectedby a common operator, each contact member extending beyond the respective spring member, and a common bus disposed transversely of said members and positioned for selective engagement by all of'said contact members but. beyond all of said spring members and a plurality of switch operators each engaging a switch contact member and a spring member from the same side thereof.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Electrophonic Musical Instruments (AREA)
US00133162A 1971-04-12 1971-04-12 Organ drop-in key assembly Expired - Lifetime US3740448A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13316271A 1971-04-12 1971-04-12

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Publication Number Publication Date
US3740448A true US3740448A (en) 1973-06-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00133162A Expired - Lifetime US3740448A (en) 1971-04-12 1971-04-12 Organ drop-in key assembly

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US (1) US3740448A (it)
JP (1) JPS562718B1 (it)
CA (1) CA955429A (it)
DE (1) DE2216997C3 (it)
GB (1) GB1343562A (it)
IT (1) IT952543B (it)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3855894A (en) * 1974-05-06 1974-12-24 Wurlitzer Co Key assembly
US4091707A (en) * 1975-12-22 1978-05-30 Graber-Rogg, Inc. Compact chord organ
US4126070A (en) * 1977-01-31 1978-11-21 Hill Jeremy R Keyboard musical instrument
US4351222A (en) * 1980-07-04 1982-09-28 Nippon Gakki Seizo Kabushiki Kaisha Keyboard musical instrument with casing comprising two halves
US4389549A (en) * 1981-11-23 1983-06-21 Cts Corporation Side actuated miniature dip switch
US4604937A (en) * 1983-01-20 1986-08-12 Nippon Gakki Seizo Kabushiki Kaisha Keyboard device of electronic musical instrument
US5107262A (en) * 1988-10-13 1992-04-21 Ministere De La Culture, De La Communication, Des Grands Travaux Et Du Bicentenaire Modular retroactive keyboard and a flat modular actuator
USRE35161E (en) * 1983-01-20 1996-02-27 Yamaha Corporation Keyboard device of electronic musical instrument
EP1675098A1 (en) * 2004-12-24 2006-06-28 Yamaha Corporation Exterior structure for keyboard instrument
US20060137509A1 (en) * 2004-12-24 2006-06-29 Yamaha Corporation Exterior structure for keyboard instrument

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5950072B2 (ja) * 1979-09-13 1984-12-06 カシオ計算機株式会社 オ−トパワ−オフ装置
DE3809720A1 (de) * 1988-03-23 1989-10-19 Edgar Tobehn Gelenk fuer klaviere, insbesondere waagenbalkengelenk

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1246998A (en) * 1916-04-25 1917-11-20 Clarkson E Pickard Demountable leveling-hinge for piano-keys.
US2049616A (en) * 1933-05-18 1936-08-04 Edgar D Lilja Electrical musical instrument
US2250065A (en) * 1940-12-07 1941-07-22 James A Kochl Musical instrument
US2470659A (en) * 1946-04-19 1949-05-17 Wurlitzer Co Piano key mounting
US2785238A (en) * 1954-01-28 1957-03-12 Baldwin Piano Co Tone color assembly for electric organs
US2899513A (en) * 1959-08-11 schmidt
US3178522A (en) * 1962-03-14 1965-04-13 Gen Electric Rocker-type switch with integral spring and c-shaped contact construction
US3330916A (en) * 1964-07-27 1967-07-11 Wurlitzer Co Bimetallic contact element for electronic musical instrument
GB1122557A (en) * 1967-03-15 1968-08-07 Wurlitzer Co Stop tablet assemblies for electronic organs
US3420131A (en) * 1965-05-12 1969-01-07 Wurlitzer Co Electronic organ preset and cancel mechanism
US3422720A (en) * 1967-02-23 1969-01-21 Melvin E Johnson Keyboard assembly
US3474182A (en) * 1965-04-14 1969-10-21 Armel Arts Mecanique Electroni Musical instrument employing single unijunction transistor oscillator in which volume is controlled by key displacement
US3576958A (en) * 1968-04-13 1971-05-04 Nippon Musical Instruments Mfg Switching device with improved tablet actuator means

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3757024A (en) * 1965-10-24 1973-09-04 H Stinson Musical instrument
US3546995A (en) * 1968-05-17 1970-12-15 Carl Semprevivo Bass chord player

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2899513A (en) * 1959-08-11 schmidt
US1246998A (en) * 1916-04-25 1917-11-20 Clarkson E Pickard Demountable leveling-hinge for piano-keys.
US2049616A (en) * 1933-05-18 1936-08-04 Edgar D Lilja Electrical musical instrument
US2250065A (en) * 1940-12-07 1941-07-22 James A Kochl Musical instrument
US2470659A (en) * 1946-04-19 1949-05-17 Wurlitzer Co Piano key mounting
US2785238A (en) * 1954-01-28 1957-03-12 Baldwin Piano Co Tone color assembly for electric organs
US3178522A (en) * 1962-03-14 1965-04-13 Gen Electric Rocker-type switch with integral spring and c-shaped contact construction
US3330916A (en) * 1964-07-27 1967-07-11 Wurlitzer Co Bimetallic contact element for electronic musical instrument
US3474182A (en) * 1965-04-14 1969-10-21 Armel Arts Mecanique Electroni Musical instrument employing single unijunction transistor oscillator in which volume is controlled by key displacement
US3420131A (en) * 1965-05-12 1969-01-07 Wurlitzer Co Electronic organ preset and cancel mechanism
US3422720A (en) * 1967-02-23 1969-01-21 Melvin E Johnson Keyboard assembly
GB1122557A (en) * 1967-03-15 1968-08-07 Wurlitzer Co Stop tablet assemblies for electronic organs
US3576958A (en) * 1968-04-13 1971-05-04 Nippon Musical Instruments Mfg Switching device with improved tablet actuator means

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3855894A (en) * 1974-05-06 1974-12-24 Wurlitzer Co Key assembly
US4091707A (en) * 1975-12-22 1978-05-30 Graber-Rogg, Inc. Compact chord organ
US4126070A (en) * 1977-01-31 1978-11-21 Hill Jeremy R Keyboard musical instrument
US4351222A (en) * 1980-07-04 1982-09-28 Nippon Gakki Seizo Kabushiki Kaisha Keyboard musical instrument with casing comprising two halves
US4389549A (en) * 1981-11-23 1983-06-21 Cts Corporation Side actuated miniature dip switch
US4604937A (en) * 1983-01-20 1986-08-12 Nippon Gakki Seizo Kabushiki Kaisha Keyboard device of electronic musical instrument
USRE35161E (en) * 1983-01-20 1996-02-27 Yamaha Corporation Keyboard device of electronic musical instrument
US5107262A (en) * 1988-10-13 1992-04-21 Ministere De La Culture, De La Communication, Des Grands Travaux Et Du Bicentenaire Modular retroactive keyboard and a flat modular actuator
EP1675098A1 (en) * 2004-12-24 2006-06-28 Yamaha Corporation Exterior structure for keyboard instrument
US20060137509A1 (en) * 2004-12-24 2006-06-29 Yamaha Corporation Exterior structure for keyboard instrument
US7425672B2 (en) * 2004-12-24 2008-09-16 Yamaha Corporation Exterior structure for keyboard instrument

Also Published As

Publication number Publication date
CA955429A (en) 1974-10-01
IT952543B (it) 1973-07-30
DE2216997B2 (de) 1980-08-21
GB1343562A (en) 1974-01-10
JPS562718B1 (it) 1981-01-21
DE2216997C3 (de) 1981-10-08
DE2216997A1 (de) 1972-10-19

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AS Assignment

Owner name: FIRST NATIONAL BANK OF CHICAGO, THE, ONE FIRST NAT

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Effective date: 19870408

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Owner name: TWCA CORP., A DE CORP.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. SUBJECT TO CONDITIONS IN AGREEMENTS RECITED;ASSIGNOR:WURLITZER COMPANY, WURLITZER MUSIC STORES, INC., WURLITZER INTERNATIONAL LTD; WURLITZER ACCEPTANCE CORPORATION AND WURLITZER CANADA, LTD.;REEL/FRAME:004998/0787

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