FR2563362A1 - DAMAGE TO THE HARMONY TABLE OR BACKGROUND OF A RESONANCE BOX OF A GUITAR OR SIMILAR INSTRUMENT; PROCESS FOR MANUFACTURING SUCH A TABLE AND SUCH A BASE FOR THE PLACEMENT OF SAID DAM AND DEVICE FOR CARRYING OUT SAID METHOD - Google Patents

Abstract

THE PRESENT INVENTION AIMS AT A DAM FOR THE HARMONY TABLE AND OR THE BOTTOM OF A GUITAR RESONANCE OR SIMILAR INSTRUMENT, WHICH DAM CONSISTS OF CROSS BARS AND OR OF LONGITUDINAL BARS ARRANGED IN FAN, CHARACTERIZED IN THAT THE SAME IS A DAM REALIZED IN MOLDED PLASTIC MATERIAL OF WHICH SAID CROSS BARS 1415 AND / OR THE SAID LONGITUDINAL BARS 45678 ARE CONNECTED BETWEEN THEM BY BRIDGES OF MATERIAL 9101112-1617 SO AS TO CONSTITUTE A UNIT DAM READY TO BE FIXED AT LON.

Description

Barrage of the soundboard or the bottom of a sound box

  guitar or similar instrument; method of manufacturing such a table or such a bottom for the establishment of said dam and

  device for implementing this method.

  The subject of the present invention is a boom table boom.

  monie or bottom of the sound box of a guitar or instrument if-

  milaire and a method of sticking this dam on said table or said bottom. The technical sector of the invention is that of violin making

  and more particularly that of plucked string instruments including

my guitars.

  A guitar consists of a sound box with a soundboard and a neck above which strings are strung fixed or applied on an bridge, generally in number

  of six. The box is closed on the side by fishplates and in its

  lower tie by a bottom which is generally slightly domed.

  To obtain an instrument with good mechanical strength and quality sound, the luthiers are required to create a barrage on the soundboard and in the background, i.e. an arrangement of

  traditionally wood bars and bars, glued on the underside

  dull table and bottom and have various functions depending on whether

it is the table or the bottom.

  The function of the soundboard barrage is to distribute the vibrations of the strings communicated to the table via the bridge for the resonance of the body. The sound produced escapes through one or more openings called rosettes or openings. Traditionally, the rosette has a round or oval opening that sits in the narrowed part of the table. The gills are generally f-shaped and are generally reserved in the enlarged part of the table opposite the handle. In a known manufacturing method, the rosette can be made in the splint and on the side that presents itself

towards the face of the performer.

  The bottom dam is traditionally made up of several

  several cross bars which extend between the ribs and of which

  the ends are embedded in backing plates.

  The present invention aims to provide a new solution to the dam of the soundboard or the bottom of the resonance boxes of guitars or other similar instruments in order to

  simplify manufacturing while producing excellent instruments

  slow quality both in terms of mechanical strength and that

of sound.

  An object of the invention is to propose a ta-

  soundboard or background in molded plastic to facilitate the implementation of the table or background and lower the price

  cost without compromising quality.

  Another objective is to make a bottom of the body so that it can resonate under the effect

vibrations of the strings.

  These objectives are achieved by the dam according to the invention

  for the soundboard or the bottom of a guitar or instrument case

  similar, which barrier comprises transverse bars and / or longitudinal bars arranged in a fan, characterized in that said barrier is made of molded plastic material of which said

  transverse bars and / or said longitudinal bars are re-

  linked together by bridges of material, so as to constitute a unitary barrier ready to be fixed to said soundboard and / or

said background.

  In one embodiment, the dam has several bars

  retes extending in the longitudinal direction of the table and / or the bottom, which bars diverge from the side of the rocker cleat and are joined together by bridges of transverse material forming

at least one transverse bar.

  Said barrier also comprises groups of bars extending in the transverse direction of the soundboard and / or at the bottom, the bars of each of said groups converging on a point

  located on the outer side of each of the longitudi- lateral bars

  nales and in alignment with said transverse bar formed by

bridges of matter.

  For a soundboard comprising at least one so-called rosette opening located in the narrowed part of the table and an easel arranged transversely to its enlarged part, said barrage comprises longitudinal bars extending from the rosette to the bottom of the table where there is the sill strip, which bars

  longitudinal are arranged in a fan, being distributed over the length

  of the bridge and on the other hand the groups of transverse bars extend from the ends of the bridge to the lateral edges of the part

enlarged table.

  In a known manner, the rosette is framed by two transverse bars

  sides joining the side edges of the table and according to the invention

  tion, said bars are made of molded plastic and are connected to each other by at least two bridges of material arranged on either side of the rosette and extending perpendicular to said

  cross bars and parallel to the longitudinal axis of the table.

  In one embodiment, at least one of the long bars

  gitudinal that make up all the bars arranged in the event

  tail is connected to one of said cross bars which frame

the rosette.

  For a soundboard with no so-called opening

  rosette and for the background which makes up said sound box and

  lon the invention, on the one hand the longitudinal bars extend from the part of the table and / or the bottom where the heel of the handle is located to the bottom of the table and / or the bottom where is the cleat rocker panels and the longitudinal bars are arranged in a fan, being distributed over the length of the bridge. On the other hand,

  groups of transverse bars extend from the ends of the cheva-

  let the side edges of the widened part of the table.

  The soundboard and / or the bottom also comprise groups of transverse bars which converge on a point located on the external side of the lateral longitudinal bars and in the part of the table between the place where the heel of the handle is located and the narrowed part of the table and in alignment with a

  transverse bar formed by bridges of material.

  Each group of cross bars consists of two

  divergent bars which form between them and the lateral bars

  the longitudinal angles of 60.

  Each of the transverse bars, longitudinal bars

  the and groups of concurrent bars comprises lugs extending from the upper edge of said bars and bars, which lugs are distributed over all or part of the length of the bars and / or bars, which lugs have their free end located in a plane parallel to the surface or to the plane on which the base of the bars rests and constitute as many shims to achieve the

  bonding of the dam on the soundboard and / or the bottom.

  In one embodiment, said pins appear under

  the shape of small cylinders and have, at their base, a small groove

  device to create a zone of least resistance to break

lugs for removal.

  The objectives are also achieved by the manufacturing process.

  cation of a soundboard and / or a guitar or instrument background

  similar by means of a dam as described above and is characterized

  made by the following operations: - the soundboard or the base is placed on a support plate;

  - the base of the bars and / or bars which

  install the molded plastic barrier; - said dam is placed on the soundboard or on the bottom; - A plate is placed on said dam which is placed on the pins of the bars and / or bars; - A pressure is exerted on said plate and this pressure is maintained during the bonding time; - and at the end of the bonding time, said plate is removed

  and possibly removing said pins.

  For the manufacture of instruments in series, - a stacking of plates and tables or funds is made up successively consisting of a plate and a table or a base on which a barrier is previously glued;

  - pressure is exerted on the upper plate of said em-

  pounding and this pressure is maintained during the bonding time; - and at the end of the collage we remove the soundboards

  or the bottoms containing the dams and possibly removing the-

so-called lugs.

  For the manufacture of soundboards, said plates which contribute to exerting pressure on the dam in view of its

  bonding are flat plates and for the manufacture of the bottom

  said plates are curved plates having the same curvature as the

so-called funds.

  The result of the invention is the dam of the hart table

  monie and / or the bottom of a guitar resonance box which, made of plastic, allows the simplification of operations during the manufacture of such tables or funds and the lowering of the price of

  returns instruments without damaging the solidity.

  The dam made of plastic molded from

  of a material having qualities similar to those of wood, pre-

  feels the advantage of allowing the implementation of instruments produced

  sound quality identical to that of traditional instruments

  tional. Other advantages and characteristics of the invention

  will emerge further on reading the following description of a bar-

  ge molded plastic with reference to the accompanying drawing in which Figure I is a plan view of the internal face of the soundboard of a guitar having a rosette-shaped opening and which illustrates the dam molded plastic , in an embodiment; - Figure 2 is a plan view of the internal face of a

  soundboard of a guitar without a rosette and which it-

  polishes the molded plastic dam in another embodiment; this figure also represents a dam that can be applied to a bottom; - Figure 3 is a sectional view along the broken line III III of Figure 1 and which illustrates a soundboard inserted between two flat plates during the bonding of a plastic dam; - Figure 4 is a sectional view along line IV IV of Figure 2 and which illustrates a soundboard inserted between two

  flat plates during the bonding of a plastic dam.

  We first refer to Figure I of the drawing which represents

  the soundboard I of a traditional guitar whose face appears

  annuity is the underside intended to be placed inside the sound box. Such a table has an enlarged part 1a,

  which is located on the side of the bottom cleat location

  se 2 and a narrowed part lb, located between the part la and the part

  lc located on the side of the location of the heel 3 of the neck of the guitar.

  In the narrowed part 1b, the table has a circular opening

  ld called rosette, which is traditionally and generally

  framed by two mutually parallel reinforcing bars extending transversely to the table, which bars are perpendicular to the median longitudinal axis XX1 which is also the axis of symmetry of

the soundboard.

  In addition to these transverse bars, the table dam consists of several longitudinal bars, for example five in number, arranged in a fan shape and which diverge from the rosette Id at the edge

  bottom of the table where the rocker cleat 2 is located.

  According to the invention, and as illustrated in FIG. 1 of the drawing, the molded plastic dam according to the invention

  and in one embodiment consists of several long bars

  tudinal 4/5/6/7/8 arranged in a fan, which bars are connected together by bridges of material of lesser height 9/10/11 /

  12, aligned and forming a transverse bar. -

  The median longitudinal bar 6 is located on the XXI axis

  and the transverse bar formed by the bridges 9/10 111/12 is per-

  pendulum to the bar 6 therefore to the axis XX1. This cross bar

  dirty 9/10/11/12 is positioned so that when the dam

  is placed on the table, it is located substantially on the long axis

  median tudinal of the easel 13 shown in dotted lines on the drawing, which is in a known manner transverse to the table and perpendicular

  audit axis XXI. The 4/8 side longitudinal bars are solid

  daires of a transverse bar 14 located on one side of the rose Id.

  A second transverse bar 15 is located on the opposite side of the rosary

  which includes the bar 14. The two bars 14/15 are parallel

  between them and perpendicular to the axis XX and extend on the par-

  narrowed tie of the table. They are connected to each other by bridges of material of lesser height 16/17, which are parallel to each other and to the axis XX and frame, in combination with the bars

  14/15, the rose Id. The material bridges 16/17 are sensitive-

  at the junction points of the side bars 4/8 and

of the crossbar 14.

  This dam also comprises two groups of trans-

  versals 18 / 19-20 / 21 which converge two by two on points 22/23 located on the side of the lateral longitudinal bars 4/8 and in alignment with the transverse bar formed of material bridges

  9/10111/12. The bars 18/19 converge on point 22 and extend

  d-nt in the part of the table between the side bar 8

  and the edge of the widened part of the table. Preferably, the barrets-

  your 18/19 are arranged at an angle a of 60 from each other

  and in relation to the side bar 8. The bars 20/21 are available

  in the same way with respect to the side bar 4 and

converge on point 23.

  As can be seen in the drawing in Figure 1, the barrets-

  your longitudinal 5/6/7 do not meet the crossbar 14 and

  are thus slightly away from it.

  Figure 2 illustrates a soundboard or background 24 of a

  contour similar to that of table 1 previously described and comprising

  both an enlarged part 24a located on the side of the rocker cleat, a less important part 24b, located on the side of the heel 26

  the handle and a narrowed portion 24c.

  In the case where it is a soundboard, it does not have a central rosette but could include gills (not shown). Said table 24 includes a barrier similar to that which has just been described with reference to FIG. 1 and for the fan-shaped part

of the last.

  This dam has longitudinal bars 27/28/29/30 /

  31 which diverge from the heel 26 to the cleat 25, which bars longi-

  tudinal extend over the length of the table or the bottom. The barret-

  te 29 extends on the axis of symmetry XX1, the other bars 27 / 28-

  30/31 diverges from the side of the rocker panel symmetrically by

compared to the bar 29.

  In the widened part 24a of the table or the bottom, the barrier comprises groups of bars 32 / 33-34 / 35 which converge two to

  two on points 36/37 located on the side of the longitudinal bars

  the lateral ones 27/31 and aligned on a transverse bar formed

  by material bridges 38 / 39-40 / 41 which connect the longitudi bars

  nales 27 to 31, said transverse bar being located in the case of a soundboard substantially on the median longitudinal axis of the bridge 42. The bars 32/33 converge on the point 36, the bars 34/35 converge on the point 37. The bars are arranged according to

  angular spacings in the same way as the bars 18 / 19-

  / 21. In addition to the concurrent transverse bars 32 / 33-34 / 35, the dam illustrated in FIG. 2 may also include two other groups of transverse bars 43 / 44-45 / 46 which converge in pairs on points 47/48 located on the side of lateral bars 27/31 and aligned on a transverse bar formed by bridges of material

  49/50/51/52 which connect the longitudinal bars 27 to 31. This bar-

  transverse rette 49 to 52 and the bar 38 to 41 are parallel in-

  they are and are perpendicular to the axis XX1.

  Bars 32/33 and 34/35 extend in the widened part

  gie24a from the table or the back: side bars 27/31 to

  side edges of the table or bottom.

  Bars 43/44 converge on point 47; the bars

  / 46 on point 48 and extend in the part of least importance

  ce 24b: from the lateral bars 27/31 to the lateral edges of the

table or bottom.

  The transverse bars 38 to 41 and 49 to 52 are, like bars 9 to 12, 16 and 17 of lesser height than the concurrent transverse bars and the longitudinal bars arranged in a fan. For example, the transverse bars 14/15 of the dam

  Figure 1 are of a height of the order of ten millimeters, the bars

  longitudinal rettes 4 to 8 and 27 to 31 are of a height of the order of six to eight millimeters. Said bars are of a trapezoidal cross section. In one embodiment, the transverse bars 14/15 and longitudinal 4 to 8 and 27 to 31 have their tapering ends leading to a practically zero height at the end. The bars

  transverse concurrent 18 / 19-20 / 21-32 / 33-34 / 35-43 / 44-45 / 46 are also-

  also degressive and are of a triangular profile so that

  that their height is zero at their free end.

  FIGS. 3 and 4 show a soundboard 1 or

  24 in the bonding position of a molded dam according to FIGS. 1 and 2.

  Table 1 or 24 is placed on a flat plate 53 perfect-

  upright. In order to exert distributed pressure on the whole

  ble of the bars making up the dam by means of a second flat plate 54, arranged parallel to the plate 53, some bars have a plurality of lugs 55, regularly distributed over the sloping parts of the transverse bars and bars and those of the

longitudinal bars.

  Material bridges 9 to 12.38 to 41 and 49 to 52 include

also such lugs 55.

  Said lugs 55 are for example small cylinders cons-

  tituants wedges whose height varies depending on the height of the bars or the place where they are placed, so that their free upper part is in a plane parallel to the plane in which are located the bases of the bars. In the particular case illustrated in FIG. 1, the transverse bars 14/15 being of greater height than the others, have lugs 55 only on their sloping ends. - Said lugs 55 may have at their base a peripheral groove 55a forming a zone of least resistance to promote their removal by breaking them flush with the bars or bars after

  whether the dam was stuck on the soundboard or on the bottom.

  The guitar bottoms being generally curved, the plates 53/54 entering the device for implementing the bottom dam, are preferably of a convex / concave shape with the same curvature as

the bottom.

  The method of bonding a molded dam according to the invention is given for a soundboard. This process is as follows:

  - Place the soundboard 1/24 on the lower flat plate

superior 53.

  - We glue the base of the bars and bars and the base

  material bridges 4 to 20 or 27 to 52 which make up the molded dam.

  - We have said barrier on the soundboard I or 24.

  - The second plate 54 is placed on said dam 4 to 20 or 27 to 52, which rests on the lugs 55 and certain bars: 14 and 15 in the case of the dam in FIG. 1, 27 to 31 in the case

of the dam in Figure 2.

  - A pressure is exerted on the second plate 54 and we

  maintains this pressure during the bonding time.

  - At the end of the adhesive drying time, said second plate 54 is removed and possibly the lugs 55 are removed by breaking them. This bonding process is particularly interesting for the implementation of the dam of a series of soundboards or

  bottoms by means of sets of molded bars.

  To do this, we successively superimpose a plate 53, a table I or 24 or a bottom, a previously glued dam, another plate 54. On this plate 54, we place another table I or 24 or another bottom, another dam previously glued, another plate 54

And so on...

  - A pressure is exerted on the upper plate 54 of the stack thus obtained and this pressure is maintained during the bonding time and at the end of the bonding, the

  plaques and tables or bottoms with their dam and event

tually we remove the lugs.

  With regard to the funds, the bonding processes of the

  dams are the same as those described for the soundboards.

  However, given the traditionally bom-

  open funds, the flat plates 53/54 which enter the composition

  tion of the bonding device of the dam are replaced by

convex / concave ques.

  As a variant and for technological reasons, these plates can be concave on one side and flat on the other and in this

  mode of execution, the height of the pins will be adapted accordingly.

  The dams, objects of the invention, are obtained from known methods such as for example by molding a material

  thermoplastic or rotational molding ...

  The material used is a thermoplastic or a

  synthetic resin with one or more components or plastics-

  lightened or expanded ticks, for example such dams are made

made of polystyrene.

he

Claims (14)

  1. Barrage of the soundboard and / or the bottom of a box   resonance of guitar or similar instrument, which barrage   carries transverse bars and / or longitudinal bars available   laid in a fan, characterized in that said barrier is made of molded plastic material of which said transverse bars (14/15) and / or said longitudinal bars (4/5/6/7/8) are interconnected by bridges of material (9/10/11 / 12-16 / 17) so that   constitute a unitary barrier ready to be fixed to said soundboard denies and / or said background.   2. Dam according to claim 1, characterized in that it comprises several bars (4/5/6/7 / 8-27 / 28/29/30/31) extending in the longitudinal direction of the table (1 / 24) and / or the bottom, which bars diverge from the side of the underbody cleat (2/25) and are   joined together by transverse material bridges (9/10/11 / 12-   38/39/40/41) forming at least one transverse bar.   3. Dam according to any one of claims I and 2,   characterized in that it further comprises groups of bars   (18 / 19-20 / 21-32 / 33-34 / 35) extending in the transverse direction of the ta-   wind band (1/24) and / or at the bottom, the bars of each of said   groups converging on a point (22/23/36/37) located on the former side   dull of each of the longitudinal side bars (4 / 8-27 / 31) and in alignment with said transverse bar formed by the bridges of material (9 to 12 and 38 to 41).   4. Barrage for a soundboard comprising at least one opening (Id) called rosette located in the narrowed part (lb) of the table and an easel (13) arranged transversely to its widened part (la), characterized in that on the one hand the longitudinal bars (4/5/6/7/8) extend from the rosette (Id) to the bottom of the table o   is the rocker strip (2), which bars   tudinal are arranged in a fan by being distributed along the length   of the bridge (13) and that on the other hand, the groups of bars trans-   versals (18 / 19-20 / 21) extend from the ends of the easel (13) to   side edges of the widened part (la) of the table.   5. Dam according to claim 4, the rosette (ld) of which is framed by two transverse bars joining the lateral edges.   of the soundboard, characterized in that said bars cross   dirty (14/15) are connected to each other by at least two bridges   material (16/17) arranged on either side of the rosette (Id) and spreads   tending perpendicular to said transverse bars (14/15) and   parallel to the longitudinal axis XX1 of the table.   6. Dam according to claim 5, characterized in that   S at least one of the longitudinal bars (4/8) which make up the   seems fan-shaped bars is connected to one (14)   said transverse bars which frame the rosette (Id).   7. Dam according to any one of claims I to 3,   for a soundboard without an opening called a rosette or for the bottom making up said sound box, characterized in   on the one hand that the longitudinal bars (27/28/29/30/31) are   extend from the part of the table and / or the bottom where the heel (26) of the handle is located to the bottom of the table and / or the bottom where the rocker cleat (25) is located and that the bars longitudinal are arranged in a fan, being distributed over the length of the bridge (42) and in that, on the other hand, the groups of transverse bars   (32 / 33-34 / 35) extend from the ends of the easel (42) to the edges la-   the enlarged part (24a) of the table.   8. Dam according to claim 7, characterized in that the soundboard (1/24) and / or the bottom further comprises groups of transverse bars (43 / 44-45 / 46) which converge on a point   (47/48) located on the outer side of the lateral longitudinal bars   them and in the part (24b) of the table between the place where the heel (26) of the handle is located and the narrowed part (24c) of the table and in alignment with a transverse bar formed by bridges of material (49/50/51/52).   9. Dam according to any one of claims 3, 4 and   7 and 8, characterized in that each group of transverse bars   (18 / 19-20 / 21-32 / 33-34 / 35-43 / 44-45 / 46) consists of two bars   vergentes which form between them and the lateral bars longitudi-   nales (4 / 8-27 / 31) angles (a) of 60.   10. Dam according to any one of claims I to 9,   characterized in that each of the cross bars (14/145) of the bars   longitudinal rets (4 to 8 and 27 to 31) and groups of concurrent bars (18 / 19-20 / 21-32 / 33-34 / 35-43 / 44-45 / 47) - have lugs   (55) extending from the upper edge of said bars and barret-   tes, which pins are distributed over all or part of the length of the bars and / or bars, which pins (55) have their free end situated in a plane parallel to the surface or to the plane on which   rests the base of the bars and constitute as many shims to make   tighten the bonding of the dam on the soundboard and / or the bottom.   11. Dam according to claim 10, characterized in that said pins (55) are in the form of small cylinders and have at their base a peripheral groove (55a) to create a   zone of least resistance to break the lugs for their removal   pressure. 12. Method of manufacturing a soundboard (1/24) and / or a guitar background or similar instrument using a barrage   according to any one of claims I to 11, characterized by the   following operations: - the soundboard (1/24) or the bottom is placed on a support plate (53); - glue the base of the bars (14/15) and / or bars (4 to 8-27 to 31-18 / 19/32/33 ...) that make up the molded plastic dam; - said barrier is placed on the soundboard (1/24) or on the bottom; - Is placed on said dam a plate (54) which is placed on the pins (53) of the bars and / or bars;   - a pressure is exerted on said plate (54) and one maintains-   holds this pressure during the bonding time; - and at the end of the bonding time, said plate is removed   (54) and optionally removing said pins (55).   13. Method according to claim 12, characterized by the following operations: - a stacking of plates (53/54) and tables (1/24) or of funds is made, successively composed of a plate (53) and a   table (1 or 24) or a bottom on which a dam is placed   enamelled glue; - A pressure is exerted on the upper plate (54) of said stack and this pressure is maintained during the bonding time; - and at the end of the collage we remove the soundboards   (1/24) or the bottoms containing the dams and possibly one supp- takes precedence over said pins.   14. Device for implementing the method according to one   any of claims 12 or 13, characterized in that for the   manufacture of soundboards made of plates (53/54) which contribute   buent to exert pressure on the dam for its bonding are flat plates and for the manufacture of the funds said plates (53/54) are curved plates having the same curvature as said funds.