EP0334175A1 - Articulation pour clavier, en particulier du type fléau d'une balance - Google Patents

Articulation pour clavier, en particulier du type fléau d'une balance Download PDF

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Publication number
EP0334175A1
EP0334175A1 EP89104522A EP89104522A EP0334175A1 EP 0334175 A1 EP0334175 A1 EP 0334175A1 EP 89104522 A EP89104522 A EP 89104522A EP 89104522 A EP89104522 A EP 89104522A EP 0334175 A1 EP0334175 A1 EP 0334175A1
Authority
EP
European Patent Office
Prior art keywords
bearing
joint
joint according
journal
bearing shell
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.)
Withdrawn
Application number
EP89104522A
Other languages
German (de)
English (en)
Inventor
Edgar Tobehn
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0334175A1 publication Critical patent/EP0334175A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10C—PIANOS, HARPSICHORDS, SPINETS OR SIMILAR STRINGED MUSICAL INSTRUMENTS WITH ONE OR MORE KEYBOARDS
    • G10C3/00—Details or accessories
    • G10C3/12—Keyboards; Keys

Definitions

  • the invention relates to a joint for pianos, in particular balance beam joint, with a cylindrical bearing journal on which a bearing shell with an approximately semicircular bearing surface in cross section is rotatably arranged.
  • the underside of the keys of a piano rests on a balance beam on which they can be swiveled like a seesaw.
  • a pin is inserted on the balance beam, which engages in a recess in the piano key.
  • This recess of the piano key has about the diameter of the pin on the underside of the piano key and increases towards the top of the piano key to an elongated hole-like recess, so that the pivoting movement of the piano key is made possible.
  • the recess in the piano key is provided on all sides with a felt garnish to prevent noise.
  • the object of the invention is therefore to propose a balance beam joint for a piano key that has a long service life with extremely easy movement and low maintenance.
  • leg ends of the bearing shell are made of plastic and have a length which is greater than the radius of the bearing journal made of plastic, the leg ends engaging in a form-fitting manner in the circumferential direction in a circumferential manner around the bearing journal, and in that the bearing journal a bead running in the circumferential direction and the bearing shell has an associated groove running about the same width in the circumferential direction.
  • the bearing journal and / or the bearing shell preferably consist of polyoxymethylene.
  • the bearing journal and the bearing shell are each arranged on a base plate which have through openings for screws or the like.
  • a bearing block is preferably arranged on the base plate of the bearing journal, on which the bearing journal sits.
  • Base plate, bearing block and bearing journal and / or base plate and bearing shell are preferably formed in one piece.
  • the cross section of the bead and the groove are preferably rectangular.
  • the bead and groove are preferably arranged in the center of the bearing journal and the bearing shell.
  • the groove advantageously has a greater depth than the height of the bead.
  • a base plate (2) is attached to a piano key (1), which has a bearing shell (3) with an approximately semicircular bearing surface in cross section.
  • a base plate (5) is attached to a balance beam (4) and carries a bearing block (6) on which a cylindrical bearing journal (7) is seated.
  • the bearing block (6) is formed on its upper side (8) on both sides of the bearing pin (7) away from the bearing pin and sloping downward.
  • the legs (9) and (10) of the bearing shell (3) have a somewhat larger height than the radius of the bearing journal (7). Since the legs (9) and (10) are elastic, the bearing shell (3) in are simply pressed onto the bearing journal (7), the leg ends (9) and (10) engaging around the bearing journal (7) in the circumferential direction in a form-fitting manner in the manner of a snap connection.
  • Base plate (2) and bearing shell (3) as well as base plate (5), bearing block (6) and bearing journal (7) are made in one piece from plastic, preferably from polyoxymethylene, so that a long service life with minimum friction is ensured.
  • the bearing journal (7) has a bead (11) which runs in the circumferential direction and is rectangular in cross section and has a height (H) of 2 mm, while the bearing shell (3) has a correspondingly designed cross section also has a rectangular, circumferential groove (12) with a depth (T) of 3 mm.
  • Bead (11) and groove (12) are each arranged in the middle of the bearing journal (7) and the bearing shell (3).
  • the base plates (2) and (5) have recesses (13) through which the like with the help of screws.
  • the base plates can be connected to the piano key (11) and the balance beam (4).
  • the balance beam joint according to the invention can both be used advantageously in new pianos, but it can also be used to repair older pianos.
  • the joint according to the invention can advantageously also be used at other points in the mechanics of a piano.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Sliding-Contact Bearings (AREA)
  • Stringed Musical Instruments (AREA)
  • Support Of The Bearing (AREA)
EP89104522A 1988-03-23 1989-03-14 Articulation pour clavier, en particulier du type fléau d'une balance Withdrawn EP0334175A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883809720 DE3809720A1 (de) 1988-03-23 1988-03-23 Gelenk fuer klaviere, insbesondere waagenbalkengelenk
DE3809720 1988-03-23

Publications (1)

Publication Number Publication Date
EP0334175A1 true EP0334175A1 (fr) 1989-09-27

Family

ID=6350447

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89104522A Withdrawn EP0334175A1 (fr) 1988-03-23 1989-03-14 Articulation pour clavier, en particulier du type fléau d'une balance

Country Status (4)

Country Link
EP (1) EP0334175A1 (fr)
DE (1) DE3809720A1 (fr)
FI (1) FI891319A (fr)
NO (1) NO891145L (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5406875A (en) * 1992-03-10 1995-04-18 Kabushiki Kaisha Kawai Gakki Seisakusho Keyboard apparatus for electronic musical instrument

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB104978A (en) * 1916-06-06 1917-03-29 Clarkson Ellis Pickard Improvements in and relating to Demountable Balance and Levelling Hinge for Piano Keys.
GB1093236A (en) * 1965-01-16 1967-11-29 Bruno Sturba Key lever for a pianoforte-type keyboard
US3422720A (en) * 1967-02-23 1969-01-21 Melvin E Johnson Keyboard assembly
US4044646A (en) * 1975-04-01 1977-08-30 Danyel S.A.S. Supporting and pivot device made of plastic for keys of pianos, electronic organs and the like
US4604937A (en) * 1983-01-20 1986-08-12 Nippon Gakki Seizo Kabushiki Kaisha Keyboard device of electronic musical instrument

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3028780A (en) * 1958-11-25 1962-04-10 Homer W Giles Chord-playing keyboard musical instrument
CH460500A (de) * 1965-01-16 1968-07-31 Sturba Bruno Hebel für eine Klaviatur
US3740448A (en) * 1971-04-12 1973-06-19 Wurlitzer Co Organ drop-in key assembly

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB104978A (en) * 1916-06-06 1917-03-29 Clarkson Ellis Pickard Improvements in and relating to Demountable Balance and Levelling Hinge for Piano Keys.
GB1093236A (en) * 1965-01-16 1967-11-29 Bruno Sturba Key lever for a pianoforte-type keyboard
US3422720A (en) * 1967-02-23 1969-01-21 Melvin E Johnson Keyboard assembly
US4044646A (en) * 1975-04-01 1977-08-30 Danyel S.A.S. Supporting and pivot device made of plastic for keys of pianos, electronic organs and the like
US4604937A (en) * 1983-01-20 1986-08-12 Nippon Gakki Seizo Kabushiki Kaisha Keyboard device of electronic musical instrument

Also Published As

Publication number Publication date
NO891145L (no) 1989-09-25
DE3809720A1 (de) 1989-10-19
DE3809720C2 (fr) 1990-01-11
FI891319A0 (fi) 1989-03-21
NO891145D0 (no) 1989-03-16
FI891319A (fi) 1989-09-24

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