NO891145L

NO891145L - CLAVIATURE KEY JOINT, SPECIAL WEIGHT ARM TYPE LINK.

Info

Publication number: NO891145L
Application number: NO89891145A
Authority: NO
Inventors: Edgar Tobehn
Original assignee: Edgar Tobehn
Priority date: 1988-03-23
Filing date: 1989-03-16
Publication date: 1989-09-25
Also published as: FI891319A; DE3809720A1; EP0334175A1; NO891145D0; DE3809720C2; FI891319A0

Description

Oppfinnelsen angår et ledd, spesielt av vektarm-typen, med sylindriske lager-tapper, hvorpå en lagerskål med en i tverrsnitt omtrent halvsirkelformet lagerplate er dreibart anordnet. The invention relates to a joint, especially of the weight arm type, with cylindrical bearing pins, on which a bearing cup with an approximately semi-circular bearing plate in cross-section is rotatably arranged.

Tangentene til et klaver ligger med sine undersider an på en vektarm og de svinges på en slags vippemåte. For sideveis arretering er det innsatt en stift i vektarmen, hvilken stift griper inn i en utsparing i klavertangenten. Denne utsparingen i klavertangenten har på undersiden av klavertangenten omtrent det samme tverrsnitt som stiften og øker mot oversiden av klavertangenten til en lang hull-liknende utsparing hvormed svinge-bevegelsen til klavertangenten blir mulig. Utsparingen i klavertangenten er på alle sider utstyrt med en filt-garnering for å forhindre støy. The keys of a piano rest with their undersides on a weight arm and they are swung in a kind of rocking fashion. For lateral locking, a pin is inserted in the weight arm, which pin engages in a recess in the piano key. This recess in the piano key has on the underside of the piano key roughly the same cross-section as the pin and increases towards the top of the piano key to a long hole-like recess with which the pivoting movement of the piano key becomes possible. The recess in the piano key is equipped on all sides with a felt lining to prevent noise.

Erfaringen har vist at under bearbeidelse av veden som klavertangenten består av, vil på grunn av fuktighet og temperatur-forandringer, bevegbarheten til tangenten bli skadet. Dessuten svekker den nødvendige utsparingen for stiften klavertangenten akkurat på stedet hvor de største kreftene blir overført, slik at det ofte skjer skader i vektarm-området, hvilke skader sågar ofte kan brekke klavertangenten. Experience has shown that during processing of the wood that the piano key is made of, due to moisture and temperature changes, the mobility of the key will be damaged. Moreover, the necessary recess for the pin weakens the piano key exactly at the place where the greatest forces are transmitted, so that damage often occurs in the weight arm area, which damage can often even break the piano key.

Formålet med oppfinnelsen består i å foreslå et vektarmledd for en klavertangent som til tross for at det er ytterst lett bevegelig og krever lite vedlikehold, oppviser en lang levetid. The purpose of the invention is to propose a weight arm joint for a piano key which, despite being extremely easy to move and requiring little maintenance, exhibits a long service life.

Oppgaven løses ved at ben-endene til lagerskålen er tildannet av elastisk kunst-stoff og oppviser en lengde som er større enn radien til lagertappene av kunst-stoff, hvorved ben-endene etter en sneppert-forbinding i omkretsretningen griper om lagertappene, og ved at lagertappene oppviser en i omkretsretningen forløpende vulst og lagerskålene oppviser ett i omkretsretningen forløpende tilordnet spor som har omtrent den samme bredden. The task is solved by the leg ends of the bearing cup being made of elastic plastic material and having a length that is greater than the radius of the plastic bearing pins, whereby the leg ends grip the bearing pins after a snap connection in the circumferential direction, and by the bearing pins exhibit a circumferentially continuous bead and the bearing cups exhibit a circumferentially continuous associated groove having approximately the same width.

Fortrinnsvis består lagertappene og/eller lagerskålene av polyoxymetylen. Preferably, the bearing pins and/or bearing cups consist of polyoxymethylene.

Ved en foretrukken utførelsesform er lagertappene og lagerskålene anordnet på en grunnplate som oppviser gjennom-løpende åpninger for skruer eller lignende. Fortrinnsvis er det på grunnplaten til lagertappene anordnet en lagerbukk som lagertappene sitter på. In a preferred embodiment, the bearing pins and the bearing cups are arranged on a base plate which has continuous openings for screws or the like. Preferably, a bearing bracket is arranged on the base plate of the bearing pins on which the bearing pins sit.

Det er fordelaktig at oversiden til lagerbukken på begge sidene av lagertappene strekker seg på skrå nedover. Grunnplaten, lagerbukken og lagertappene og/eller grunnplaten og lagerskålen er fortrinnsvis tildannet i ett stykke. It is advantageous that the upper side of the bearing bracket on both sides of the bearing pins extends obliquely downwards. The base plate, the bearing frame and the bearing pins and/or the base plate and the bearing cup are preferably formed in one piece.

Tverrstykket til vulsten og sporet er fortrinnsvis rettvinklet. Fortrinnsvis er vulsten og sporet alltid anordnet i midten av lagertappene og lagerskålen. The cross-section of the bead and the groove is preferably right-angled. Preferably, the bead and the groove are always arranged in the center of the bearing pins and the bearing cup.

Det er fordelaktig at sporet har en større dybde enn høyden til vulsten. It is advantageous that the groove has a greater depth than the height of the bead.

Oppfinnelsen er vist som eksempel i tegningene, hvor:The invention is shown as an example in the drawings, where:

Fig. 1 viser vektarmleddet i henhold til oppfinnelsen sett fra Fig. 1 shows the weight arm joint according to the invention seen from the side

siden,since,

Fig. 2 viser lagerskålen sett ovenfra, ogFig. 2 shows the bearing bowl seen from above, and

Fig. 3 viser lagertappen sett ovenfra.Fig. 3 shows the bearing pin seen from above.

På figurene 1 til 3 er en klavertangent 1 festet til en grunnplate 2 som oppviser en lagerskål 3 med en lagerplate som har omtrent halvsirkelformet tverrsnitt. In Figures 1 to 3, a piano key 1 is attached to a base plate 2 which exhibits a bearing bowl 3 with a bearing plate having an approximately semicircular cross-section.

En grunnplate 5 som bærer en lagerbukk 6 hvorpå det sitter en sylinderformet lagertapp 7, er anordnet på en vektarm 4. A base plate 5 which carries a bearing bracket 6 on which sits a cylindrical bearing pin 7, is arranged on a weight arm 4.

Lagerbukken 6 er på sin overside 8 til begge sider av lagertappen 7 tildannet med skrå partier som forløper nedover. The bearing bracket 6 is formed on its upper side 8 to both sides of the bearing pin 7 with sloping parts that extend downwards.

Som figur 1 videre viser, har benene 9 og 10 til lagerskålen 3 noe større høyde enn radius til lagertappen 7. Da benene 9 og 10 er tildannet elastisk, kan lagerskålen 3 på enkel måte påtrykkes lagertappen 7 hvorved ben-endene 9 og 10 som følge av en slags sneppert-virkning griper om lagertappen 7 i omkretsretningen. As figure 1 further shows, the legs 9 and 10 of the bearing cup 3 have a slightly greater height than the radius of the bearing pin 7. As the legs 9 and 10 are formed elastically, the bearing cup 3 can be simply pressed against the bearing pin 7 whereby the leg ends 9 and 10 as a result of a kind of snappert effect grips the bearing pin 7 in the circumferential direction.

Grunnplaten 2 og lagerskålen 3 såvel som grunnplaten 5, lagerbukken 6 og lagertappen 7 består av kunststoff, fortrinnsvis polyoxymetylen, slik at det oppnås en lang levetid med liten slitasje. The base plate 2 and the bearing cup 3 as well as the base plate 5, the bearing bracket 6 and the bearing pin 7 consist of plastic, preferably polyoxymethylene, so that a long service life with little wear is achieved.

Som figurene 2 og 3 viser, oppviser lagertappen 7 en i omkretsretningen forløpende vulst 11 som har rettvinklet tverrsnitt og som har en høyde H på 2 mm, mens lagerskålen 3 viser et i omkretsretningen forløpende spor 12 som likeledes har et rettvinklet tverrsnitt og som har en dybde T på 3 mm.Vulsten 11 og sporet 12 er vanligvis anordnet i midten av lagertappen 7 og lagerskålen 3, As figures 2 and 3 show, the bearing pin 7 has a circumferentially running bead 11 which has a right-angled cross-section and which has a height H of 2 mm, while the bearing cup 3 shows a circumferentially running groove 12 which likewise has a right-angled cross-section and which has a depth T of 3 mm. The bead 11 and the groove 12 are usually arranged in the middle of the bearing pin 7 and the bearing cup 3,

Grunnplatene 2 og 5 oppviser utsparinger 13 hvorigjennom grunnplaten kan forbindes med klavertangenten 11 og vektarmen 4 ved hjelp av skruer eller lignende. The base plates 2 and 5 have recesses 13 through which the base plate can be connected to the piano key 11 and the weight arm 4 by means of screws or the like.

Vektarmleddet i henhold til oppfinnelsen kan med fordel finne anvendelse i forbindelse med nye klaverer, men den kan også innsettes i eldre klaverer. Leddet i henhold til oppfinnelsen kan fordelaktig settes inn i klaveret også på andre steder for å erstatte andre mekaniske overføringer. The weight arm joint according to the invention can advantageously be used in connection with new pianos, but it can also be used in older pianos. The joint according to the invention can advantageously be inserted into the piano also in other places to replace other mechanical transmissions.

Claims

1. Joint for a piano, in particular a weight arm joint with a cylindrical bearing pin on which a bearing cup with an approximately semi-circular bearing surface in cross-section is rotatably arranged, characterized in that the leg ends (9, 10) of the bearing cup (3) are formed elastically from plastic and exhibit a length that is greater than the radius of the bearing pin (7) which is also made of plastic, whereby the leg ends grip the bearing pin with a snap connection in a dimensionally stable manner in the circumferential direction, and by the bearing pin showing a bead (11) running in the circumferential direction and the bearing cup showing a in the circumferential direction progressively assigned groove (12) with approximately the same width as the bead.

2. Clause according to requirement 1, characterized in that the bearing pin (7) and/or the bearing cup consists of polyoxymethylene.

3. Joint according to claim 1 or 2, characterized in that the bearing pin (7) and the bearing cup (3) are usually arranged on a base plate (5 or 2), which plate has continuous openings (13) for screws or the like.

4. Joint according to one of claims 1 to 3, characterized in that a bearing bracket (6) is arranged on the base plate (5) of the bearing pin (7) on which the bearing pin (7) sits.

5. Paragraph according to requirement 4, characterized in that the upper side of the bearing bracket (6) on both sides of the bearing pin (7) is designed with sections that slope away from the bearing pin and extend downwards.

6. Joint according to one of claims 3 to 5, characterized in that the base plate (5), the bearing bracket (6) and the bearing pin (7) and/or the base plate (2) and the bearing cup (3) are formed in one piece.

7. Joint according to one of claims 1 to 6, characterized in that the groove or groove has a greater depth (D) than the height (H) of the bead or spring.

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 right-angled.

9. Joint according to one of claims 1 to 8, characterized in that the bead (11) and the groove (12) are usually arranged in the middle of the bearing pin (7) and the bearing cup (3).