WO2003085637A1

WO2003085637A1 - Treble box of accordion

Info

Publication number: WO2003085637A1
Application number: PCT/SI2003/000008
Authority: WO
Inventors: Valentin Zupan
Original assignee: Valentin Zupan
Priority date: 2002-03-13
Filing date: 2003-03-13
Publication date: 2003-10-16
Also published as: AU2003220803A1

Abstract

A treble box of an accordion made of a hollow housing (1) containing a tone chamber (1'), which is open at one side (2) and intended to be connected with the bellows and on the opposite side it is partially covered by a grille (3) and behind it there is a keyboard assembly (4) with keys (5), whereat the chamber (1') contains a treble reed blocks board (6) dividing the chamber (1') between the bellows and the grille (3) and having reeds (7) arranged on said board and the treble reed blocks board (6) can be perpendicularly curved, so that on the curved section (6') there is enough room for up to two additional blocks of reeds (7) lying at an angle to the rest of the reeds (7), so that the keyboard assembly (4) is thicker in a way that its rear wall (8) is concave to form an empty space (11) in the keyboard assembly (4), said empty space being open into the tone chamber (1').

Description

TREBLE BOX OF ACCORDION

Subject of Invention

The subject of the invention is a treble box of an accordion.

Technical Problem

The technical problem solved by the invention is how to conceive a treble box of an accordion so as to improve the sound quality with preserving unchanged external dimensions of the box and with improving the ergonomics of the box.

Prior Art

Known treble boxes are conceived as hollow rectangular parallelepipedic bodies with a keyboard assembly as a slanting plate on one side and with an attachment to the bellows on the other side. Due to reasons of design and aesthetics, the essentially parallelepipedic body of the treble box is rounded at the edges, which does not change the basic design. The box contains a treble reed blocks board with reeds arranged in several blocks on the side of the bellows. Boxes offering a richer sound have the treble reed blocks board executed perpendicularly curved in such a way that two additional reed blocks at the most are arranged on the bent part on the back side of the accordion lying against the chest of the player. Thus, the hollow place in the box is totally filled. With the dimensions of the box being limited by ergonomic requirements of the player, the dimensions cannot be increased in order to improve the quality of the sound.

It is known that a larger resonance space essentially contributes to the quality of the sound apart from well-chosen materials of the box, off which the air vibrated by the reeds reflects and gets the timbre.

Solution of the Technical Problem

The described technical problem is solved by a new treble box of the invention, the essence of which lies in the fact that the dimensions are preserved and yet the tone chamber is enlarged in such a way that it continues to the treble panel behind the keys. Since the treble panel contains a part of the tone chamber, it is thicker: its rear part is convex and uninterruptedly continues into the rear wall of the treble box by preferably forming a blunt angle with it, if looking in the direction of the keyboard. The shape of the rear wall provides a more adequate fitting of the treble box to the player's chest, which decreases the possibility of side movements of the treble box on the player's chest when moving the bellows. The player is less burdened by holding the treble box in the right position while playing.

The enlargement of the tone chamber into the keyboard assembly further allows such an arrangement of side reeds that a larger air flow produced by the bellows flows around them, with the air flowing more uninterruptedly in comparison with known solutions where the air flows through side reeds in an interrupted manner. An appropriate selection of materials of the keyboard assembly additionally contributes to the timbre. A larger tone chamber in the keyboard assembly makes it possible to build in a flap as an additional treble switch changing the sound. It is also possible to make an additional full or perforated separation wall in order to achieve variations in timbre.

The treble reed blocks board can also be shaped in a way that the side reeds placed on the curved part of this board are oriented more into the centre of the increased resonance space, which again contributes to an improved quality of the timbre.

The essence of the invention will be described in more detail in the continuation of the description by presenting embodiments and drawings showing:

Fig.l a first embodiment of a treble box of the invention in sectional view,

Fig.2 a second embodiment of a treble box of the invention in sectional view,

Fig.3 a third embodiment of a treble box of the invention in sectional view,

Fig.4 a fourth embodiment of a treble box of the invention in sectional view. A treble box of an accordion is made of a hollow housing 1 containing a tone chamber 1', which is open at one side 2 and intended to be connected with the bellows not presented in the drawings. On the opposite side it is partially covered by a grille 3 and behind it there is a keyboard assembly 4 with keys 5. The mechanism of keys 5 is not presented in the drawings in order to make the presentation clearer. The chamber 1' contains a treble reed blocks board 6 dividing the chamber 1' between the bellows and the grille 3. Reeds 7 are arranged on the board. The treble reed blocks board 6 can be perpendicularly curved so that on the curved section 6' there is enough room for up to two additional blocks of reeds 7. The keyboard assembly 4 is thicker so that a rear wall 8 in the area of the chamber 1 is convex in a way to form together with a wall 9, i.e. the rear wall of the keyboard assembly 4, a blunt angle or rather a shallow and broad groove 10 running in parallel with the keyboard assembly 4. The keyboard assembly 4 thus has an empty space 11 enlarging the tone chamber 1'.

The enlargement of the tone chamber 1' with the space 11 offers new opportunities of various arrangements of reeds 7 as well as new opportunities of a temporary closure of the space 11 in the direction of the top of the keyboard assembly 4 by a turnable flap 12.

A further embodiment is shown in Fig. 3. Since the space 11 is larger, the treble reed blocks board 6 is bent in the direction towards the rear wall 8 so that the reeds 7 arranged in this part are shifted towards the centre of the space 11 thus receiving more flow of the air produced by the bellows. The flow of air through the space 11 and the reeds 7 towards the grille 3 is more fluent or rather less interrupted in comparison with known solutions. So the timbre is fuller. Although not shown in the drawings, this embodiment allows separation walls and flaps being arranged as shown and described in the previous embodiments. Further effects on the timbre can be achieved by an appropriate choice of materials for the described parts of the treble box. The spaces 11 and 11' are separated by a separation wall 13 preferably made of a resonance wood or a similar material so that the sound vibration in space 11 is transferred through it to the space 11' behind it. Thereby another timbre is achieved.

The separation wall 13 in the embodiment of the invention is inclined so that the volume of the space 11 ' within the keyboard assembly 4 is smaller in the area of the reeds for lower pitches and larger in the area of the reeds for higher pitches.

The separation wall 13 can protrude into the space 11'. The separation wall 13 simultaneously contains openings 14 of optional, also various shapes, to allow sound waves to pass from the space 11 through to the space 11', where they change and return to the space 11 and further to the space 1 and through the grille 3 out of the instrument.

The sizes of the openings 14 can be changed by an additional means 15, e.g. a bolt, a slide or a flap to be controlled preferably manually from the outside of the instrument.

It is understood that on the basis of the knowledge of the described embodiments further variants and combinations of said possibilities can be conceived without circumventing the essence of the invention claimed in the attached patent claims.

Claims

1. Treble box of an accordion made of a hollow housing (1) containing a tone chamber (1'), which is open at one side (2) and intended to be connected with the bellows and on the opposite side it is partially covered by a grille (3) and behind it there is a keyboard assembly (4) with keys (5), whereat the chamber (1') contains a treble reed blocks board (6) dividing the chamber (1') between the bellows and the grille (3) and having reeds (7) arranged on said board and the treble reed blocks board (6) can be perpendicularly curved so that on the curved section (6') there is enough room for up to two additional blocks of reeds (7), characterized in that the keyboard assembly (4) is widened to contain a space (11) connected with the chamber (1').

2. Treble box according to claim 1, characterized in that its rear wall (8) is convex in a way to form, with a wall (9) i.e. the rear wall of the keyboard assembly (4), a blunt angle or rather a shallow and broad groove (10) running in parallel with the keyboard assembly (4).

3. Treble box according to claim 1, characterized in that the space (11) has a turnable flap (12).

4. Treble box according to claims 1 to 3, characterized in that the space (11) has a separation wall (13).

5. Treble box according to claims 1 to 4, characterized in that the treble reed blocks board (6) is bent in direction towards the rear wall (8), whereat the two blocks of reeds (7) arranged in this part are shifted towards the centre of the space (11).

6. Treble box according to claims 1 to 5, characterized in that a separation wall (13) is inclined so that the volume of the space (11') within the keyboard assembly (4) is smaller in the area of the reeds for lower pitches and larger in the area of the reeds for higher pitches.

7. Treble box according to claims 1 to 6, characterized in that the separation wall (13) can protrude into the space (11').

8. Treble box according to claims 1 to 7, characterized in that the separation wall (13) contains openings (14).

9. Treble box according to claims 1 to 8, characterized in that additional means (15), e.g. bolts, slides, or flaps controlled preferably manually from the outside of the instrument are foreseen for changing the sizes of the openings (14).