US3600543A - Keying switch assembly - Google Patents

Keying switch assembly Download PDF

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Publication number
US3600543A
US3600543A US878061A US3600543DA US3600543A US 3600543 A US3600543 A US 3600543A US 878061 A US878061 A US 878061A US 3600543D A US3600543D A US 3600543DA US 3600543 A US3600543 A US 3600543A
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US
United States
Prior art keywords
contact member
switch assembly
elastically bendable
shock absorbing
keying switch
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
US878061A
Other languages
English (en)
Inventor
Seiji Nakada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Gakki Co Ltd
Original Assignee
Nippon Gakki Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Gakki Co Ltd filed Critical Nippon Gakki Co Ltd
Application granted granted Critical
Publication of US3600543A publication Critical patent/US3600543A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H21/00—Switches operated by an operating part in the form of a pivotable member acted upon directly by a solid body, e.g. by a hand
    • H01H21/02—Details
    • H01H21/18—Movable parts; Contacts mounted thereon
    • H01H21/22—Operating parts, e.g. handle
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/60—Mechanical arrangements for preventing or damping vibration or shock
    • 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
    • G10H2220/00—Input/output interfacing specifically adapted for electrophonic musical tools or instruments
    • G10H2220/155—User input interfaces for electrophonic musical instruments
    • G10H2220/265—Key design details; Special characteristics of individual keys of a keyboard; Key-like musical input devices, e.g. finger sensors, pedals, potentiometers, selectors
    • G10H2220/275—Switching mechanism or sensor details of individual keys, e.g. details of key contacts, hall effect or piezoelectric sensors used for key position or movement sensing purposes; Mounting thereof

Definitions

  • a keying switch assembly operable by means of a key includes a stationary contact member, an elastically bendable contact member having a fixed end and a movable end which is selectively operable [to contact the stationary contact, and a flexible shock absorber attached to the bendable contact member for reducing shock noises.
  • An actuator strikes against the shock absorber upon operation of the key so as to cause the bendable contact member to be silently bent, so that the movable end thereof contacts the stationary contact member.
  • FIG 2 FIG. 3
  • This invention relates to a keying switch assemblyparticularly adapted for usein anelectronic musical instrument.
  • a keying switch assembly comprises one or more switch units, each of which involves'a stationary contact member, an elastically bendable contact member, and
  • An object of this invention is to provide akeying switch assembly so improved'as to avoid the generation of noises.”
  • Another object of this invention is to provide --a keying switch assembly so improved as to avoid the generation 'of noises, and at the same time maintaining an elastically bendable contact member with the same degree of flexibility as occurs in thecase where the contact member is not provided with a shock absorber.
  • the keying switch assembly comprises one or more switch unitsgeach of which comprises a stationary contact member, a leaf-shaped elastically bendable contact member, oneend thereofbeing fixed and the other end thereof being movable, said elastically bendablecontact member 9 being selectively movable to contact with-said stationary-contact member 7; a thin shock-absorbing plate attachedto an intermediate position of thebo'dy of the bendable contact member and .an actuator actuated by the vkey and striking against the shock absorber to cause the bendablecontact member to contact the stationary contactmember.
  • FIG. 2 is a perspective view of the essential parts of said keying switch assembly
  • F IG'; 3 is a transverse cross section of a shock absorber in: volved in said keying switch assembly;
  • FIG. 4 is a side view of another embodiment of a keying switch assembly of the present invention.
  • FIGS. 1 to 3 indicate a keyingswitch assembly comprising one switch unit in corresponding relationship with each of a plurality of key members.
  • Each of said key members 1 is swingably supported by causing a V-shaped'groove formed at the rear endthereof to engage with the upper edge of a vertically disposed supporting plate 2.
  • Said supporting plate 2 has a rearwardly bent lower portion, and a-coiled spring member-3 bridges the rear ends of said supporting plate and key member.
  • Said supporting plate 2 is'attachedto the rear end of a key bed frame 4,2 the lower side of which are disposed first and second supporting members 5 and 6 of electric insulatingmember 1 and extending parallel to each other.
  • a leaf-shaped elastically bendable contact member 9 is attached to the lowerend of said'second supporting member 6 and forwardly extends therefrom in a mannerto cause its forward end-portion to contact the contact member 8;
  • Said contact member 9 is preferably made of phosphor bronze or nickel silver.
  • An elastically bendable supporting member 10 Arranged' above and parallel to said contact member 9 is an elastically bendable supporting member 10 whichforwardly extends from said supporting member 6.
  • An actuator 11 formed as a short barmember is attached to the forward end of said supporting member 10 and vertically'extends through a bore 12 formed in the bodyof said key bed frame 4.
  • a thin shock-absorbing plate 13 is attached to an intermediate position of said bendable contact member 9.
  • Said absorbing plate 13 consists of a flexiblemember, for example, of soft synthetic resin or rubber, and improved so as to maintain the flexibility'of the bendable contact member 9, thereby permitting said' bendable contact member to be bent through said absorbing plate 13.
  • Said absorbing plate 13 is preferably provided with a dovetail groove 13' opening'at the lower side thereof andextending in a longitudinal direction of the bendablecontact member-9.
  • Said bendable contact member 9 has a dovetail cross section to be fitted into said dovetail groove. The contact member 9 is thus easilyand firmly engaged in the dovetail groove 13' of the absorbing plate 13 even after the contact member 9 is attached to the supporting member 6.
  • Said shock absorber 13 preferably has a plurality of parallel spaced grooves 14 so as to maintain the same flexibility as occursin the case where said contact member 9 is not provided stanceyof soft rubber which is attached to the lower portion thereof and abutting against the top of said actuating bar 11 when the key member is pushed down.
  • the swinging'motion of 'said key member 1 causes the actuator 11 noiselessly to strike against the shock absorber l3 and thus bend the body of said-bendable contact member "until the forward end portion of said contact member9contacts the stationary contact member 7 so as to be electrically connected therewith.
  • said key member '1 automatically returned by the action of the spring member 3 so that the actuator 11 is removed from the upper surface of said shock absorbing plate 13 by the reaction of said supporting member ID and the contact member 9 is returned to the original position byits own reaction, electrically disconnecting the contact members 7 and 9 from each other.
  • the shock absorber 13 is attached to the bendable contact member 9, it will not so actdue to its thin and flexible body as to obstruct the contact member'9 from being fully bent when the key is lightly touched by the player.
  • FIG. 4 indicates another embodiment of the keying switch assembly wherein many switch units corresponding to one key memberare arranged in such'a manner that elastically bendable contact members 9a, 9b and 9c involyed in said switch units respectively are operated only by a common actuating member 11d, and there is attached a flexible shock absorber 13a to each of said contact members.
  • said flexible shock absorber 1311 has a protrusion 16 integrally formed on theupper portion thereoflsaid protrusion 16 contacting the lower surface of the adjacent contact member positioned there'above, and theuppermost protrusion being in abutment against the lower end of the actuating member lla.
  • the height of the shock absorber 13a is, at the protrusion portion, substantially equal to the distance between the adjacent two of the elastically bendable contact members.
  • a keying switch assembly operated by a key comprising:
  • shock absorbing member (13) of flexible material attached to said elastically bendable contact member (9) at a position thereof intermediate said fixed and movable ends;
  • said actuator (10,11) comprises an elastically bendable support member (10) having one end fixed, and an actuator member (11) connected to the other end of said elastically I bendable support member (10).
  • shock absorbing member (13) is generally in the form of a plate.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Push-Button Switches (AREA)
US878061A 1968-11-21 1969-11-19 Keying switch assembly Expired - Lifetime US3600543A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1968101650U JPS5324270Y1 (enrdf_load_stackoverflow) 1968-11-21 1968-11-21

Publications (1)

Publication Number Publication Date
US3600543A true US3600543A (en) 1971-08-17

Family

ID=14306240

Family Applications (1)

Application Number Title Priority Date Filing Date
US878061A Expired - Lifetime US3600543A (en) 1968-11-21 1969-11-19 Keying switch assembly

Country Status (4)

Country Link
US (1) US3600543A (enrdf_load_stackoverflow)
JP (1) JPS5324270Y1 (enrdf_load_stackoverflow)
DE (1) DE1958339C3 (enrdf_load_stackoverflow)
NL (1) NL163344C (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3663776A (en) * 1970-05-19 1972-05-16 Nippon Musical Instruments Mfg Vibrator absorbing means for an electrical switch
US3735076A (en) * 1970-12-26 1973-05-22 Nippon Musical Instruments Mfg Electronic musical instrument key-operated switch assembly having vibration-absorber attached to movable contact member
DE2845289A1 (de) * 1977-10-31 1979-06-07 Burroughs Corp Elektrisch veraenderbares speicherelement mit einer positiven elektrode, einer negativen elektrode und einer speicherfaehigen struktur zwischen den beiden elektroden
US5423227A (en) * 1991-10-30 1995-06-13 U.S. Philips Corporation Device for generating multi-directional commands

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2802076A (en) * 1956-04-30 1957-08-06 Gen Electric Non-boundcing snap switch
US3255326A (en) * 1963-09-23 1966-06-07 Wurlitzer Co Electronic musical instrument pedal structure
US3388229A (en) * 1966-12-16 1968-06-11 Dominion Electrohome Ind Ltd Switch particularly for electronic organs

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2802076A (en) * 1956-04-30 1957-08-06 Gen Electric Non-boundcing snap switch
US3255326A (en) * 1963-09-23 1966-06-07 Wurlitzer Co Electronic musical instrument pedal structure
US3388229A (en) * 1966-12-16 1968-06-11 Dominion Electrohome Ind Ltd Switch particularly for electronic organs

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3663776A (en) * 1970-05-19 1972-05-16 Nippon Musical Instruments Mfg Vibrator absorbing means for an electrical switch
US3735076A (en) * 1970-12-26 1973-05-22 Nippon Musical Instruments Mfg Electronic musical instrument key-operated switch assembly having vibration-absorber attached to movable contact member
DE2845289A1 (de) * 1977-10-31 1979-06-07 Burroughs Corp Elektrisch veraenderbares speicherelement mit einer positiven elektrode, einer negativen elektrode und einer speicherfaehigen struktur zwischen den beiden elektroden
US5423227A (en) * 1991-10-30 1995-06-13 U.S. Philips Corporation Device for generating multi-directional commands

Also Published As

Publication number Publication date
DE1958339B2 (de) 1973-08-16
DE1958339A1 (de) 1970-06-04
NL163344B (nl) 1980-03-17
NL163344C (nl) 1980-08-15
DE1958339C3 (de) 1974-03-07
JPS5324270Y1 (enrdf_load_stackoverflow) 1978-06-22
NL6917440A (enrdf_load_stackoverflow) 1970-05-25

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