DESCRIPTION OF THE INVENTION
Technical field
[0001] The subject invention refers to the method of producing the ergonomic surface of
the chinrest for string instruments. Namely subject invention relates to creating
an ergonomic chin rest for stringed instrument: 3D scanning both the instrument and
the imprint of the user and surface of instrument, computer modelling the instrument
and imprint of a user so as to create a chin rest by making the imprint and instrument
correspond. Finally producing the chinrest using a computer controlled process based
on the 3D model. According to the international patent classification, this invention
belongs to the technical field of G10D3/18: Chinrests, hand rests or protectors as
parts of musical instrument accessories.
The essence of the invention
[0002] The function of the chinrest for string instruments is that it serves as a support
that facilitates playing the instrument for the violinist and violist in the manner
where the violinist's/violist's chin rests on the chinrest. In this manner, a direct
and more comfortable contact with the instrument is achieved, facilitating musicality.
[0003] Furthermore, the pressure of the chin, i.e. the head on the chinrest causes undesired
consequences that are visible as bruises and superficial injuries of the skin, jawbone,
neck vertebrae and neck muscles. The consequences of an inadequate chin, or head,
pressure on the chinrest results in decreased concentration and technical ability
to play music. Furthermore, every violinist has a unique head/chin orientation in
three-dimensional space in respect to the violin or viola string instrument, which
presents a problem when using a universal chinrest.
[0004] The described problem is completely resolved with the subject invention, which minimally
affects the sound of the violin, and simultaneously provides the musician with an
ergonomically formed chinrest that is completely adapted to each individual user,
i.e. to the shape of their chin and the manner of holding the instrument.
Previous state of the art
[0005] With the current solution of a violin/viola chinrest, the chin, i.e. the position
of the head must be adapted to the design of the chinrest. The purpose of this invention
is just the opposite, the attainment of the "perfect" adaptation of the chinrest to
the individual anatomy of the chin and position of the head in the referenced relation
with the string instruments, violins and violas. The basic purpose of the invention
is to find the best solution concerning the ergonomic adaptation of the chinrest base
(which serves as a support for the chin i.e. head of the musician while playing) for
the chin itself, i.e. the head of the musician, and that the procedure for taking
(approximately 15 minutes is necessary for taking an imprint) and producing an ergonomic
imprint is sufficiently simple and inexpensive for final production.
[0006] Another aspect of this invention that applies to the mechanical attachment of the
chinrest has been considered in the document
HR P20060375A2 of the applicant VŠP d.o.o.; however, the solution elaborated therein does not resolve
the problem regarding the poor attachment of the chinrest during its prolonged use,
and inevitable loosening of the chinrest during its use. Likewise, the solution according
to document
P20060375A2 does not take into consideration the need for ergonomics of the chinrest's upper
surface on which the chin lies. Both problems are now completely resolved with the
subject invention as shall be shown further.
[0007] DE19532900, defines a chinrest model comprising a plastic compound which takes an imprint of
the user and is digitised so as to enable producing an individual chin-rest. In
US4719835, the chin-rest provides a malleable material which is used to obtain an imprint of
the performer's chin and is then hardened by cooling.
DE4311418 discloses using a copying milling process to replicate an imprint of a user chin
on a model chin-rest.
Detailed description of the invention
[0008] The individualized anatomic and referenced upper surface of the chinrest's base as
shall be explained enables the greatest amount of comfort for the musician according
to his personal playing manner, in respect to the position of his chin i.e. head in
respect to the instrument. Likewise, the anatomic and referenced upper surface of
the chinrest's base decreases the occurrence of physical problems caused by skin irritation
and the bruising thereof due to constant pressure of the chin on the chinrest's base;
in other words, the chinrest protects the health of the neck vertebrae and muscles.
Among other properties, this product enables better concentration and focus on the
creation of music.
[0009] The individualistic anatomic and referenced replica of the chin in respect to the
violin or viola transferred onto the surface of the chinrest's base is exclusively
possible using only the double imprint of the chin and violin with three-dimensional
micro scanning, and by processing and analyzing the acquired data for obtaining the
result of unique, specific, ergonomic dimensions of the chinrest.
Short description of the figures
[0010] The subject invention is displayed in figures 1-8, whose short description follows:
Figure 1 displays the 3D model of a violin with basic parts thereof, created with
3D micron scanning
Figure 5 provides a display of referencing the double imprint (2) upon identical surfaces
on the violin or viola that represents the referent object
Figure 6 displays the upper portion (2.1) of the double imprint (chin imprint i.e.
musician's head)
Figure 7 displays the lower portion (2.2) of the double imprint (imprint of the violin
or viola portion)
Figure 8a) shows the double imprint (2) referenced in respect to the violin or viola
from a side view
Figure 8b) shows the separated upper surface of the referenced double imprint (2)
in respect to the violin or viola from a side view
Figure 8c) shows the chinrest (1) with the individual anatomic, ergonomic and referenced
upper surface (2.1) of the base from a side view
Figure 9a) displays the double imprint (2) referenced in respect to the violin or
viola in a frontal view
Figure 9ab) displays the separated upper surface of the referenced double imprint
(2) in respect to the violin/viola in a frontal view
Figure 9ab) displays the chinrest (1) with the individual anatomic, ergonomic and
referenced upper surface of the base in a frontal view
Figure 10a) displays the double imprint (2) referenced in respect to the violin/viola
in a spatial view
Figure 10b) displays the separated upper surface (2.1) of the referenced double imprint
in respect to the violin/viola in a spatial view
Figure 10c) displays the chinrest (1) with the individual anatomic, ergonomic and
referenced upper surface of the base in a spatial view
[0011] The details of the invention's implementation are given in detailed analysis of the
positions on the mentioned figures.
[0012] Basic aspect of this invention that it refers to the technical solution of obtaining
the anatomic ergonomic upper surface (2.1) of the chinrest according to the appended
claim 1, is that it consists of a combination of scientific, surveying and mathematical
approaches.
[0013] The production of the chinrest's ergonomic surface is actualized by utilizing the
following technological actions:
- i. 3D micron scanning of violin or viola in order to obtain a precise and measurable
3D model
- ii. taking double simultaneous imprints, and a 3D micron scan and referencing thereof
- iii. processing and analysis of the acquired data in order to obtain unique and specific
ergonomic dimensions of the chinrest
- iv. final production of the chinrest in accordance to the acquired specifications
with an appropriate production process
[0014] All of the aforementioned actions are described in detail hereinafter.
i) 3D micron scanning:
[0015] Technology enables the spatial scanning of any object (in this case a violin or viola
and all additional parts thereof, such as a tailpiece, end button, lower block of
the violin, etc.), and a representation thereof in the form of an exact, precise and
measurable 3D model. Such a 3D model becomes the basis for the further design of parts
and accessories of the violin and viola, with emphasis on the chinrest. The same technology
is used for the three-dimensional scanning of the double imprint (2) as one of the
basic parameters of this invention, which is explained hereinafter.
ii) Taking a double simultaneous imprint:
[0016] As the basic portion of this invention and with the aid of a rapid contracting compound,
this method enables the acquisition of precise imprints of violin or viola parts (potions
of the upper panel of the resonant box together with the edge of the violin/viola
and a portion of the groove that is permanently attached to the violin or viola in
its entirety on its lower side with a rapid contracting compound), and an imprint
of the position of the musician's head i.e. chin on the upper side (2.1) of the rapid
contracting compound while the compound i.e. material is still soft i.e. adaptable
at the moment forces act upon it. In this manner, the three-dimensional position of
the chin i.e. head is defined as a basis in respect to the position of the violin
or viola. An individual anatomic ergonomic imprint of the chin i.e. head is simultaneously
acquired, which is referenced in respect to the violin/viola as a referencing object
at the moment of taking the imprint.
[0017] Referencing one object in respect to another in this text refers to the harmonization
or transformation of its local coordinate system onto the coordinate system of the
referenced object. In this case, the referenced object is the violin/viola, and the
object referenced thereto is the double imprint (2). Referencing is possible due to
a mutual identical surface. This mutual identical surface originates during the creation
of the imprint, which is described in detail hereinafter.
[0018] The upper portion (2.1) of the double imprint (2) ultimately represents the referenced
anatomic ergonomic surface of the chinrest's upper portion (2.1), which serves as
a support for the chin, i.e. head of the musician when playing the instrument. The
compound or material for taking imprints must have the properties, i.e. the possibility
of plasticity i.e. the deformation of the surface according to the shape of the body
that executes pressure thereon. In this specific case, we have the simultaneous pressure
of the chin, i.e. the head on one side and the pressure of the string instrument on
the other side. An additional characteristic of the material that must be fulfilled
is the characteristic of subsequent contraction and further formation of a solid object
that represents a precise double imprint (2) as previously described herein. It is
important for the material to be non-toxic for human use as well as harmless for the
string instrument in the sense of any undesired consequences. The compound has the
characteristic of rapid contraction, and ultimately defines the precise imprint of
the chin, or head, on one side, which is securely connected with the imprint of the
portion of the violin or viola on the lower side. In this manner, the musician's imprint
(his chin i.e. head in the individual position of his method of musicality) is in
direct association with the position of the violin at the moment of providing the
imprint. With further computer processing, the individual spatial position of the
musician's chin i.e. head in the referenced relation with the violin or viola is transferred
onto the base of the chinrest.
iii) Processing and analysis of the acquired data
[0019] After 3D scanning and the creation of individual and precise 3D models of imprint
(2), the computerized return of the double imprint (2) to the identical position in
respect to the violin, or viola, at the moment when the imprint was taken follows.
Such computerized return or referencing is possible with the impressed surfaces of
the violin's or viola's portions (2.2) on the double imprint and associated surface
(3) of the instrument.
[0020] The next action involves the removal of the upper surface (2.1) of the referenced
double imprint (2) (the surface created by pressure of the chin, or head) with the
basic condition of withholding its initial spatial position created when taking the
double imprint (referencing or locking). Furthermore, the chinrest's base is adapted
by projection onto the referenced and removed portion of the upper surface (2.1) of
the double imprint (2), which likewise becomes the upper surface of the anatomic ergonomic
surface of the chinrest's (1) base and as such a support, satisfies the requirements
of the individual position of the musician's chin i.e. head while playing the instrument.
[0021] This processing method, as a constituent part of the invention, other than being
used for the precise determination of individual anatomic ergonomics with referencing
in respect to a violin/viola, is likewise used for projecting the anatomic ergonomics,
which averages multiple imprints and ultimately represents the upper surface of the
chinrest's base according to a group of musicians that characterizes a similar chin
i.e. head position in respect to the violin/viola.
iv) Production of the chinrest
[0022] Furthermore, in accordance with the acquired data and calculated specifications,
the production of the ergonomic chinrest for a violin/viola (1) using a new method
of attachment onto the body of an instrument is possible by using an appropriate production
process. The production process to be used can be milling, injection press or lamination.
Industrial use of the invention
[0023] The stated invention can be utilized in production and with the use of musical instruments
(especially violins and violas) and with the accessories and components thereof.
LIST OF REFERENCED DESIGNATIONS
[0024]
- 1
- ergonomic chinrest for violin of viola
- 2
- double simultaneous imprint
- 2.1
- upper surface of double simultaneous imprint
- 2.2
- bottom surface of double simultaneous imprint
- 3
- surface of the violin/viola
1. The process of producing the ergonomic chinrest for violin or viola (1)
characterized by that the following actions are involved:
i. 3D micron scanning of violin or viola and of all additional parts thereof in order
to obtain a measurable scanned 3D model of the violin/viola
ii. taking a double simultaneous imprint of user's chin upper side
(2.1) and violin or viola lower side (2.2), and a 3D micron scan of double imprint
and referencing thereof in respect to scanned 3D model of violin or viola from step
i), while referencing is possible due to a mutual identical surface that is represented
by lower side
(2.2) of double simultaneous imprint (2) and corresponding upper surface (1) of violin
or viola
iii. processing and analysis of the acquired data obtained in step i) and step ii)
in order to obtain chinrest for violin or viola with the ergonomic dimensions
iv. final production of the chinrest for violin or viola by milling, injection pressing
or lamination method .
2. The process of producing the ergonomic chinrest for violin or viola (1) according
to claim 1 characterized by that a double simultaneous imprint (2) consist of imprint of user's chin on the upper
side of the imprint (2.1) and imprint of violin or viola on the lower side of the
imprint (2.2) wherein double simultaneous imprint (2) is taken by contacting of rapidly
contracting compound with the user's chin on the upper side of the imprint (2.1) and
the lower side of imprint (2.2) is taken simultaneously by contacting of rapidly contracting
compound with the surface of violin of viola that includes a portion of the upper
panel of the resonant box together with the edge of the violin and a portion of the
groove that is permanently attached to the violin or viola.
3. The process of producing the ergonomic chinrest for violin or viola (1) according
to claim 1 characterized by that referencing refers to the harmonization or transformation of a local coordinate
system onto the coordinate system of the referenced object, whereby the referenced
object is the surface of violin/viola (1), and the object referenced thereto is the
lower side (2.2) of the double simultaneous imprint (2).
4. The process of producing the ergonomic chinrest for violin or viola (1) according
to patent claim 3 characterized by that referencing is possible due to the existance of mutual identical surfaces that are
represented with the surface of the violin/viola (3) and the other surface is the
lower side (2.2) of the double simultaneous imprint (2).
5. The process of producing the ergonomic chinrest for violin or viola (1) according
to any patent claim from 1 to 4
characterized by that the double simultaneous imprint (2) is taken by using a material having:
- a characteristic of plasticity i.e. deformation of the surface according to the
shape of the body that executes pressure thereon,
- a characteristic of subsequent contraction and formation of a solid object that
represents double simultaneous imprint (2), and
- a non-toxicity characteristic for humans as well as for the string instrument in
the sense of any undesired consequences.
6. The process of producing the ergonomic chinrest for violin or viola (1) according
to patent claim 1 characterized by that upon taking the double simultaneous imprint (2), the processing and analysis of the
acquired data is executed, which includes the 3D scanning process and the creation
of a 3D model of the double imprint (2), and the computerized return of the double
simultaneous imprint (2) to the identical position in respect to the violin or viola,
at the moment when the double simultaneous imprint (2) was taken is further implemented.
7. The process of producing the ergonomic chinrest for violin or viola (1) according
to patent claim 6
characterized by that the following steps are executed during the computer return process:
- removal of the upper surface (2.1) of the referenced double simultaneous imprint
the surface created by pressure of the chin, or head, with the condition of withholding
its initial spatial position created when taking the double imprint
- the base of the chinrest is further adapted by projection onto the referenced and
removed portion of the upper surface (2.1) of the double simultaneous imprint (2),
which likewise becomes the upper anatomic ergonomic surface of the chinrest's base.
8. The process of producing the ergonomic chinrest for violin or viola (1) according
to any one of claims 1 to 7 characterized by that it can be used for all types of chinrests regardless of the type of chin-rest suspender
used on the violin or viola.
1. Prozess der Herstellung einer ergonomischen Kinnstütze für Violine oder Viola (1)
ist
dadurch gekennzeichnet, dass er folgende Schritte beinhaltet:
i. 3D Mikrometer-Scannen der Violine oder Viola und aller dazugehörigen Teile, um
ein messbares gescanntes 3D Modell der Violine oder Viola zu bekommen
ii. Abnehmen des doppelten simultanen Abdrucks der Oberseite des Benutzerkinns (2.1)
und der Unterseite der Violine oder Viola (2.2) und das 3D Mikrometer-Scannen des
doppelten Abdrucks und in Bezug auf das gescannte 3D Modell der Violine oder Viola
vom Schritt i), während Bezugnahme möglich ist dank der gegenseitig identischen Oberfläche,
die durch die Unterseite (2.2) des doppelten simultanen Abdrucks (2) und der entsprechenden
oberen Fläche (1) der Violine oder Viola dargestellt wurde.
iii. Abwicklung und Analyse der im Schritt i) und ii) erhaltenen Daten zum Zwecke
von Erhalten einer Kinnstütze für Violine oder Viola mit ergonomischen Dimensionen
iv. Endproduktion einer Kinnstütze für Violine oder Viola durch Fräsen, Spritzgießen-Pressen
und Laminierung.
2. Prozess der Herstellung der ergonomischen Kinnstütze für Violine oder Viola (1) ist
gemäß dem Anspruch 1 dadurch gekennzeichnet, dass der doppelte simultane Abdruck (2) aus dem Abdruck des Benutzerkinns auf der Oberseite
des Abdrucks (2.1) und dem Abdruck der Violine oder Viola besteht (2.2), wobei der
doppelte simultane Abdruck (2) im Kontakt von einem sich schnell zusammenziehenden
Wirkstoff mit dem Kinn des Benutzers auf der Oberseite des Abdrucks (2.1) abgenommen
wurde, und die Untersite des Abdrucks (2.2) gleichzeitig im Kontakt von einem sich
schnell zusammenziehenden Wirkstoff mit der Oberfläche der Violine oder Viola, dass
einen Deckenteil des Resonanzkastens einschließt, zusammen mit der Zarge der Violine
und einem Teil der Furche, die permanent an die Violine oder Viola befestigt ist.
3. Prozess der Herstellung der ergonomischen Kinnstütze für Violine oder Viola (1) gemäß
dem Anspruch 1 ist dadurch gekennzeichnet, dass die Bezugnahme sich auf die Hamonisierung oder Transformierung des lokalen Koordinationssystems
in das Koordinationssystem des betreffenden Objektes bezieht, wobei das betreffende
Objekt die Oberfläche der Violine/Viola (1) ist, und das betreffende Objekt diesbezüglich
die Unterseite (2.2) des doppelten simultanen Abdrucks darstellt (2).
4. Prozess der Herstellung der ergonomischen Kinnstütze für Violine oder Viola (1) gemäß
dem Anspruch 3 ist dadurch gekennzeichnet, dass die Bezugnahme möglich ist dank dem Existieren der gegenseitig identischen Oberflächen,
die durch die Oberfläche der Violine/Viola dargestellt sind (3), wobei die andere
Oberfläche die Unterseite (2.2) des doppelten simultanen Abdrucks ist (2).
5. Prozess der Herstellung der ergonomischen Kinnstütze für Violine oder Viola (1) gemäß
den Ansprüchen 1 bis 4 ist
dadurch gekennzeichnet, dass der doppelte simultane Abdruck (2) abgenommen wurde, indem man Materialien benutzte,
die:
- Eigenschaft der Plastizität d.h. Deformierung der Oberfläche gemäß der Form des
den Druck ausübenden Körpers aufweisen,
- Eigenschaft des dadurch hervorgerufenen Zusammenziehens und der Bildung eines soliden
Objekts, das den doppelten simultanen Abdruck darstellen (2) und
- nicht toxische Eigenschaften für die Menschen und das Streichinstrument im Sinne
von irgendwelchen unerwünschten Folgen haben.
6. Prozess der Herstellung der ergonomischen Kinnstütze für Violine oder Viola (1) gemäß
dem Anspruch 1 ist dadurch gekennzeichnet, dass nach der Abnahme des doppelten simultanen Abdrucks (2) die erworbenen Daten bearbeitet
und analysiert werden, was den Prozess des 3D Scannens und den Entwurf des 3D Modells
des doppelten Abdrucks (2) einschließt, und dass anschließend die computergestützte
Rückkehr des doppelten simultanen Abdrucks (2) in die Ausgangsposition in Bezug auf
die Violine oder Viola, in den Augenblick, wo der doppelte simultane Abdruck (2) genommen
wurde, angewendet wurde.
7. Prozess der Herstellung der ergonomischen Kinnstütze für Violine oder Viola (1) gemäß
dem Patentanspruch 6 ist
dadurch gekennzeichnet, dass während des computergestützten Rückkehrprozesses folgende Schritte unternommen wurden:
- Beseitigen der oberen Fläche (2.1) des bezüglichen doppelten simultanen Abdrucks,
der Fläche, die durch das Drücken des Kinns oder des Kopfes entstanden ist, unter
der Bedingung der Einhlatung ihrer Ausgangsposition, die während der Abnahme des doppelten
Abdrucks entstand,
- die Basis der Kinnstütze wurde weiterhin angepasst, indem sie auf den hingewiesenen
und beseitigten Teil der oberen Fläche (2.1) des doppelten simultanen Abdrucks (2)
projiziert wurde, der ebenfalls zur oberen anatomisch ergonomischen Fläche der Kinnstützenbasis
wird.
8. Prozess der Herstellung einer ergonomischen Kinnstütze für Violine oder Viola (1)
gemäß den Patentansprüchen 1 bis 7 ist dadurch gekennzeichnet, dass er für alle Typen von Kinnstützen angewendet werden kann, ohne Rücksicht auf den
Typ des Kinnhalters, der an der Violine oder Viola zum Einsatz gekommen ist.
1. Le procédé de la fabrication d'une mentonnière ergonomique pour violon ou alto (1)
est
caractérisé en ce qu'il comprend les étapes suivantes:
i. Balayage micrométrique 3D du violon ou de l'alto et de toutes les parties associées
pour obtenir un modèle 3D mesurable du violon ou de l'alto
ii. Prise da la double empreinte simultanée de la partie supérieure du menton de l'utilisateur
(2.1) et du fond du violon ou viole (2.2) et le balayage micrométrique 3D de la double
empreinte et par rapport au modèle 3D numérisée du violon ou viole de l'étape i),
tandis que le référencement est possible grâce à la surface identique mutuelle représentée
par la partie inférieure (2.2) de la double empreinte simultanée (2) et de la partie
supérieure correspondante (1) du violon ou alto.
iii. Traitement et analyse des données obtenues aux étapes i) et ii) dans le but d'obtenir
une mentonnière pour violon ou alto aux dimensions ergonomiques
iv. Production finale d'une mentonnière pour violon ou alto par fraisage, moulage
par injection et laminage.
2. Le procédé de la fabrication de la mentonnière ergonomique pour violon ou alto (1)
selon la revendication 1 est caractérisée en ce que la double empreinte simultanée (2) est réalisée à partir de l'empreinte du menton
de l'utilisateur sur la face supérieure de l'empreinte (2.1) et la partie inférieure
de l'empreinte (2.2) étant retirée simultanément en faisant contact avec un agent
contractant à l'action rapide avec la surface du violon ou alto qui comprend une partie
du panneau supérieur du boîtier de résonateur avec le cadre du violon et une partie
de la rainure qui est attachée en permanence au violon ou à l'alto.
3. Le procédé de la fabrication de la mentonnière ergonomique pour violon ou alto (1)
selon la revendication 1, caractérisé en ce que le référencement concerne l'harmonisation ou la transformation du système de coordination
local en système de coordination de l'objet considéré selon lequel l'objet en question
représente la surface du violon ou alto (1) et l'objet considéré est la partie inférieure
(2.2) de la double empreinte simultanée (2).
4. Le procédé de la fabrication de la mentonnière ergonomique pour violon ou alto (1)
selon la revendication 3, caractérisé en ce que la référence est possible grâce à l'existence des surfaces mutuelles identiques représentées
par la surface du violon / alto (3) et l'autre surface étant la partie inférieure
(2.2) de la double empreinte simultanée (2).
5. Le procédé de la fabrication de la mentonnière ergonomique pour violon ou alto (1)
selon les revendications 1 à 4,
caractérisé en ce que la double empreinte simultanée (2) a été enlevée en utilisant des matériaux qui ont:
- la propriété de plasticité, c'est-à-dire de la déformation de la surface en fonction
de la forme du corps qui applique la pression,
- la propriété de la contraction subséquente et la formation d'un objet solide représentant
la double empreinte simultanée (2) et
- les propriétés non toxiques pour les gens et l'instrument à cordes dans le sens
de n'importe quelles conséquences indésirables.
6. Le procédé de la fabrication de la mentonnière ergonomique pour violon ou alto (1)
selon la revendication 1, caractérisé en ce que les données acquises sont traitées et analysées après la prise de la double impression
simultanée (2) en employant le procédé de 3D balayage et la création du modèle 3D
de la double empreinte (2), puis retour assisté par ordinateur de la double empreinte
simultanée (2) à la position initiale par rapport au violon ou à l'alto, au moment
où la double empreinte simultanée (2) a été prise, a été appliqué.
7. Le procédé de la fabrication de la mentonnière ergonomique pour violon ou alto (1)
selon la revendication 6,
caractérisé en ce que pendant le processus de retour assisté par ordinateur, les étapes suivantes ont été
réalisées:
- enlèvement de la surface supérieure (2.1) de l'empreinte double simultanée respective,
la surface formée par la pression du menton ou de la tête, dans la condition de l'inclusion
de sa position spatiale qui s'est produite lors de la prise de la double empreinte,
- la base de la mentonnière a été ajustée par projection sur la partie indiquée et
enlevée de la surface supérieure (2.1) de la double empreinte simultanée (2), qui
devient également la surface supérieure anatomiquement ergonomique de la base mentonnière.
8. Le procédé de la fabrication de la mentonnière ergonomique pour violon ou alto (1)
selon les revendications 1 à 7, caractérisé en ce qu'il peut être appliqué à tous les types de mentonnières sans tenir compte du type du
support de la mentonnière utilisé au violon ou à l'alto.