EP0334175A1 - Joint for piano, especially balance-beam joint - Google Patents

Joint for piano, especially balance-beam joint 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
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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.)
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Application number
EP89104522A
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German (de)
French (fr)
Inventor
Edgar Tobehn
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Individual
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Individual
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Publication date
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Publication of EP0334175A1 publication Critical patent/EP0334175A1/en
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    • 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.

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  • 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)

Abstract

The keys of a piano rest with their undersides on a balance beam and are locked in the lateral direction by a pin which engages into a recess in the piano keyboard. The new joint is to have a long service life, with easy accessibility and low maintenance, without any risk of impairments of mobility caused by changes in humidity and temperature. The joint has a cylindrical bearing journal (7) on which can be placed a bearing shell (3), in the manner of a snap connection, having a bearing surface which is approximately semicircular in cross-section. <IMAGE>

Description

Die Erfindung betrifft ein Gelenk für Klaviere, insbesondere Waagenbalkengelenk, mit einem zylinderförmigen Lagerzapfen, auf dem eine Lagerschale mit einer im Querschnitt etwa halbkreisförmigen Lagerfläche drehbar angeordnet ist.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.

Die Tasten eines Klavieres liegen mit ihrer Unterseite auf einem Waagenbalken auf, auf dem sie nach Art einer Wippe geschwenkt werden können. Zur seitlichen Arretierung ist auf dem Waagenbalken ein Stift eingesetzt, der in eine Ausnehmung der Klaviertaste greift. Diese Ausnehmung der Klaviertaste hat an der Unterseite der Klaviertaste etwa den Durchmesser des Stiftes und vergrößert sich zur Oberseite der Klaviertaste zu einer langlochartigen Ausnehmung, damit die Schwenkbewegung der Klaviertaste ermöglicht wird. Die Ausnehmung in der Klaviertaste ist allseitig mit einer Filzgarnierung versehen, um Geräusche zu verhindern.The underside of the keys of a piano rests on a balance beam on which they can be swiveled like a seesaw. For lateral locking, 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.

Die Erfahrung hat gezeigt, daß durch das Arbeiten des Holzes der Klaviertaste auf Grund von Feuchtigkeits- und Temperaturänderungen die Bewegbarkeit der Klaviertaste beeinträchtigt wird. Darüber hinaus schwächt die notwendige Ausnehmung für den Stift die Klaviertaste genau an der Stelle, an der die größten Kräfte zu übertragen sind, so daß es oftmals im Waagenbalkenbereich zu Beschädigungen oder sogar zum Brechen der Klaviertaste kommt.Experience has shown that working the wood of the piano key due to changes in moisture and temperature affects the mobility of the piano key. In addition, the necessary recess for the pen weakens the piano key exactly at the point at which the greatest forces are to be transmitted, so that damage or even breakage of the piano key often occurs in the area of the balance beam.

Die Aufgabe der Erfindung besteht daher darin, ein Waagenbalkengelenk für eine Klaviertaste vorzuschlagen, das bei äußerst leichter Gängigkeit und Wartungsarmut eine hohe Lebensdauer aufweist.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.

Die Aufgabe wird dadurch gelöst, daß die Schenkelenden der Lagerschale aus Kunststoff elastisch ausgebildet sind und eine Länge aufweisen, die größer als der Radius des Lagerzapfens aus Kunststoff ist, wobei die Schenkelenden nach Art einer Schnappverbindung in Umfangsrichtung den Lagerzapfen formschlüssig umgreifen, und daß der Lagerzapfen einen in Umfangsrichtung verlaufenden Wulst und die Lagerschale eine in Umfangsrichtung verlaufende, zugeordnete Nut etwa gleicher Breite aufweist.The object is achieved in that the 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.

Vorzugsweise bestehen der Lagerzapfen und/oder die Lagerschale aus Polyoxymethylen.The bearing journal and / or the bearing shell preferably consist of polyoxymethylene.

Bei einer bevorzugten Ausführungsform sind der Lagerzapfen und die Lagerschale jeweils auf einer Grundplatte angeordnet, die Durchtrittsöffnungen für Schrauben o. dgl. aufweisen. Vorzugsweise ist auf der Grundplatte des Lagerzapfens ein Lagerbock angeordnet, auf dem der Lagerzapfen sitzt.In a preferred embodiment, 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.

Vorteilhaft ist die Oberseite des Lagerbockes beiderseits des Lagerzapfens vom Lagerzapfen weg schräg geneigt nach unten verlaufend ausgebildet. Grundplatte, Lagerbock und Lagerzapfen und/oder Grundplatte und Lagerschale sind vorzugsweise einstückig ausgebildet.The upper side of the bearing block on both sides of the bearing journal is advantageously designed to extend obliquely downward from the bearing journal. Base plate, bearing block and bearing journal and / or base plate and bearing shell are preferably formed in one piece.

Der Querschnitt des Wulstes und der Nut sind vorzugsweise rechteckig. Vorzugsweise sind Wulst und Nut jeweils in der Mitte des Lagerzapfens und der Lagerschale angeordnet.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.

Vorteilhaft hat die Nut eine größere Tiefe als die Hohe des Wulstes.The groove advantageously has a greater depth than the height of the bead.

Die Erfindung ist in den Zeichnungen beispielhaft dargestellt. Es zeigen:

  • Fig. 1 das erfindungsgemäße Waagenbalkengelenk in Seitenansicht,
  • Fig. 2 die Lagerschale in Draufsicht und
  • Fig. 3 der Lagerzapfen in Draufsicht.
The invention is illustrated by way of example in the drawings. Show it:
  • 1 is a side view of the balance beam joint according to the invention,
  • Fig. 2, the bearing shell in plan view
  • Fig. 3 of the trunnion in plan view.

Nach den Fig. 1 bis 3 ist an einer Klaviertaste (1) eine Grundplatte (2) befestigt, die eine Lagerschale (3) mit einer im Querschnitt etwa halbkreisförmigen Lagerfläche aufweist.1 to 3, 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.

Auf einem Waagenbalken (4) ist eine Grundplatte (5) befestigt, die einen Lagerbock (6) trägt, auf dem ein zylinderförmiger Lagerzapfen (7) sitzt.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.

Der Lagerbock (6) ist an seiner Oberseite (8) beiderseits des Lagerzapfens (7) vom Lagerzapfen weg schräg geneigt nach unten verlaufend ausgebildet.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.

Wie die Fig. 1 weiter zeigt, weisen die Schenkel (9) und (10) der Lagerschale (3) eine etwas größere Höhe als der Radius des Lagerzapfens (7) auf. Da die Schenkel (9) und (10) elastisch ausgebildet sind, kann die Lagerschale (3) in einfacher Weise auf den Lagerzapfen (7) aufgedrückt werden, wobei die Schenkelenden (9) und (10) nach Art einer Schnappverbindung den Lagerzapfen (7) in Umfangsrichtung formschlüssig umgreifen.As FIG. 1 also shows, 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.

Grundplatte (2) und Lagerschale (3) sowie Grundplatte (5), Lagerbock (6) und Lagerzapfen (7) bestehen einstückig aus Kunststoff, vorzugsweise aus Polyoxymethylen, so daß eine hohe Lebensdauer bei geringster Reibung gewährleistet ist.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.

Wie die Fig. 2 und 3 zeigen, weist der Lagerzapfen (7) einen in Umfangsrichtung verlaufenden, im Querschnitt rechteckigen Wulst (11) mit einer Hohe (H) von 2 mm auf, während die Lagerschale (3) eine entsprechend ausgebildete, im Querschnitt ebenfalls rechteckige, in Umfangsrichtung verlaufende Nut (12) mit einer Tiefe (T) von 3 mm aufweist. Wulst (11) und Nut (12) sind jeweils in der Mitte des Lagerzapfens (7) und der Lagerschale (3) angeordnet.As shown in FIGS. 2 and 3, 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).

Die Grundplatten (2) und (5) weisen Ausnehmungen (13) auf, durch die mit Hilfe von Schrauben o.dgl. die Grundplatten mit der Klaviertaste (11) und dem Waagenbalken (4) verbindbar sind.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).

Das erfindungsgemäße Waagenbalkengelenk kann sowohl vorteilhaft bei neuen Klavieren Anwendung finden, es kann aber auch zur Instandsetzung älterer Klaviere verwandt werden. Das erfindungsgemäße Gelenk kann vorteilhaft auch an anderen Stellen der Mechanik eines Klavieres eingesetzt werden.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.

Claims (9)

1. Gelenk für Klaviere, insbesondere Waagenbalkengelenk, mit einem zylinderförmigen Lagerzapfen, auf dem eine Lagerschale mit einer im Querschnitt etwa halbkreisförmigen Lagerfläche drehbar angeordnet ist, dadurch gekennzeichnet, daß die Schenkelenden (9, 10) der Lagerschale (3) aus Kunststoff elastisch ausgebildet sind und eine Länge aufweisen, die größer als der Radius des Lagerzapfens (7) aus Kunststoff ist, wobei die Schenkelenden nach Art einer Schnappverbindung in Umfangsrichtung den Lagerzapfen formschlüssig umgreifen, und daß der Lagerzapfen einen in Umfangsrichtung verlaufenden Wulst (11) und die Lagerschale eine in Umfangsrichtung verlaufende, zugeordnete Nut (12) etwa gleicher Breite aufweist.1. 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, characterized in that the leg ends (9, 10) of the bearing shell (3) are made of plastic and have a length which is greater than the radius of the bearing journal (7) made of plastic, wherein the leg ends engage in a form-fitting manner in the circumferential direction in the manner of a snap connection, and that the bearing journal has a bead (11) running in the circumferential direction and the bearing shell an in Associated groove (12) running in the circumferential direction has approximately the same width. 2. Gelenk nach Anspruch 1, dadurch gekennzeichnet, daß der Lagerzapfen (7) und/oder die Lagerschale aus Polyoxymethylen bestehen.2. Joint according to claim 1, characterized in that the bearing pin (7) and / or the bearing shell consist of polyoxymethylene. 3. Gelenk nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Lagerzapfen (7) und die Lagerschale (3) jeweils auf einer Grundplatte (5) bzw. (2) angeordnet sind, die Durchtrittsöffnungen (13) für Schrauben o.dgl. aufweisen.3. Joint according to claim 1 or 2, characterized in that the bearing pin (7) and the bearing shell (3) are each arranged on a base plate (5) or (2), the passage openings (13) for screws or the like. exhibit. 4. Gelenk nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß auf der Grundplatte (5) des Lagerzapfens (7) ein Lagerbock (6) angeordnet ist, auf dem der Lagerzapfen (7) sitzt.4. Joint according to one of claims 1 to 3, characterized in that on the base plate (5) of the bearing pin (7) a bearing block (6) is arranged on which the bearing pin (7) is seated. 5. Gelenk nach Anspruch 4, dadurch gekennzeichnet, daß die Oberseite des Lagerbocks (6) beiderseits des Lagerzapfens (7) vom Lagerzapfen weg schräg geneigt nach unten verlaufend ausgebildet ist.5. Joint according to claim 4, characterized in that the top of the bearing block (6) on both sides of the bearing pin (7) from the bearing pin is formed inclined downwards. 6. Gelenk nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, daß Grundplatte (5), Lagerbock (6) und Lagerzapfen (7) und/oder Grundplatte (2) und Lagerschale (3) einstückig ausgebildet sind.6. Joint according to one of claims 3 to 5, characterized in that the base plate (5), bearing block (6) and bearing journal (7) and / or base plate (2) and bearing shell (3) are integrally formed. 7. Gelenk nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Nut eine größere Tiefe (D) als die Höhe (H) des Wulstes hat.7. Joint according to one of claims 1 to 6, characterized in that the groove has a greater depth (D) than the height (H) of the bead. 8. Gelenk nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß der Querschnitt des Wulstes (11) und der Nut (12) rechteckig ist.8. Joint according to one of claims 1 to 7, characterized in that the cross section of the bead (11) and the groove (12) is rectangular. 9. Gelenk nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß Wulst (11) und Nut (12) jeweils in der Mitte des Lagerzapfens (7) und der Lagerschale (3) angeordnet sind.9. Joint according to one of claims 1 to 8, characterized in that bead (11) and groove (12) are each arranged in the center of the journal (7) and the bearing shell (3).
EP89104522A 1988-03-23 1989-03-14 Joint for piano, especially balance-beam joint Withdrawn EP0334175A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883809720 DE3809720A1 (en) 1988-03-23 1988-03-23 JOINT FOR PIANOS, IN PARTICULAR BALANCE JOINT
DE3809720 1988-03-23

Publications (1)

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

Family

ID=6350447

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89104522A Withdrawn EP0334175A1 (en) 1988-03-23 1989-03-14 Joint for piano, especially balance-beam joint

Country Status (4)

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

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 (en) * 1965-01-16 1968-07-31 Sturba Bruno Lever for a keyboard
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
FI891319A (en) 1989-09-24
DE3809720A1 (en) 1989-10-19
NO891145L (en) 1989-09-25
NO891145D0 (en) 1989-03-16
DE3809720C2 (en) 1990-01-11
FI891319A0 (en) 1989-03-21

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