Dismountable stringed musical instrument with splitted fingerboard

Abstract

A dismountable stringed musical instrument with a splittable fingerboard and an acoustic sound is disclosed having a hollow body composed by two parts shaped as half empty shell that meets each other on their outer perimeter, defining a sound chamber. The fingerboard is splitted in two parts that can be re-assembled by a rigid inner core which works as a reinforcement and as a trail to allows the fingerboard cutted portions to slide on it meeting each other perfectly and by a latch toggle clamp which hold the two parts strictly merged together, taking back the fingerboard to its original playable smoothness. The neck can be dismounted to from the body and then re-assembled in the playing position also adjusting its inclination at will by movable elements placed on the neck extremity which faces the top portion of the body support area.

Claims

1. A foldable stringed musical instrument having a body with a lower end portion and an upper end portion, a neck having a lower end portion and an upper end portion and a plurality of strings running from the body to the upper end portion of the neck, wherein the instrument further comprises a) a playable fingerboard cut crosswise in at least two parts connected to each other on the cut's cross section wherein said playable fingerboard still keeps its characteristics of playability and said playable fingerboard is connected to said neck longitudinally; and b) a mounting apparatus configured to join said playable fingerboard parts together comprising: i) an elongated rigid element connected to one of said playable fingerboard cut parts and said elongated rigid element having a portion protruding off from said cross section of said playable fingerboard cut part; ii) a locking device connected to another one of said playable fingerboard cut parts; wherein at least one part of said playable fingerboard cut parts, different from the said part which is connected to said elongated rigid element, presents a recess slot having the same shape and outline of the said protruding portion of the said elongated rigid element so that said protruding portion is housed into said recess slot.

2. The foldable musical instrument according to claim 1, in which said elongated rigid element has an engage element on its said protruded portion, and said locking device is clasped to said engage element.

3. The foldable musical instrument according to claim 2, in which said engage element is a pin.

4. The foldable musical instrument according to claim 1, in which said elongated rigid element is a T bar rigid plate.

5. The foldable musical instrument according to claim 1, in which said locking device is a latch hook clamp.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF DRAWINGS

(1) FIGS. 1, 2, 3 are, respectively, the front, side and back view of the instrument mounted in its entirety.

(2) FIG. 4 is a perspective view of the fingerboard mounting system which shows all the elements involved in the mounting system itself, while also shows a top and side view of the main element 2d.

(3) FIG. 5 is a perspective view of the neck to body mounting system which shows all the elements involved in the system itself together with the elements involved in the neck inclination adjusting system.

(4) FIGS. 6 and 7 are perspective view of the shoulder mounting system and features, respectively, while being mounted and when mounted.

(5) FIG. 8 is a perspective exploded view of the screws and the elements which are needed to complete the assembly of all the parts connected with the body which are shoulders and neck.

(6) FIG. 9 is a perspective view of how the endpin length adjustment works, with a balloon showing more in detail the hide mechanism which lock the endpin at the desired length.

DESCRIPTION OF THE PREFERRED EMBODIMENT

(7) Referring now to the figures in greater detail, where like reference numbers denote like parts in the various figures: the present invention will be described by way of an illustrative example (using a double bass).

(8) In FIGS. 1, 2 and 3 there is shown an electric upright double bass constructed in accordance with the present invention where you can see the main parts of the instrument, that will be described specifically at a later point, defined by circled callouts from 1 to 11.

(9) Conventional tuning gears 1a are mounted on the head 1 of the instrument on the top of the neck 2 that run out on the body 4. The neck and the body can be easily disassembled, consistently with the intention of the present invention. The neck 2 is equipped with a fingerboard 3 that looks in shape and usability like a conventional ebony double bass fingerboard, except for the transverse cut that divides it in two parts, easily conjoining it without any junction point or step perceptible by touch. In this graphic presentation, for clarity, it is called fingerboard 3 only the part that can be dismantled from the entire fingerboard, considering the part in-built with the neck 2 as part of the neck itself.

(10) A plurality of playing strings are stretched out from the string rent 4h on the lowest part of the body 4 passing over the tailpiece 7 and the bridge 6, up to the nut 2f ending on the tuning gears 1a hub. It will be clearly understood that the number of strings arranged along the neck and the body portions depends on whether four, five or other type string arrangement is desired.

(11) The present string musical instrument further includes a piezoelectric bridge 6 pickup with adjustment wheels 6a, that allow adjustment of the bridge 6 height by turning them. The bridge is held against the body 4 by the tension of the strings in a direction transversal to the longitudinal axis of the neck 2 and roughly equidistant from the end of the fingerboard 3 and string tailpiece, precisely in two slots 4i on the body that house perfectly the bridge feet, to ensure the ideal positioning whenever it is placed for strings mounting.

(12) The preferred embodiment according to the present invention shows the body 4 as a wooden hollow acoustic chamber with a specifically designed shape. In the present invention, the hollow body 4 is made by two parts, the front face (called soundboard) and the back face, attached together and shaped as empty shells which meet each others on their respective perimeter, or border. The spatial arrangement between the soundboard and the back face define the acoustic chamber 4 which has a substantial impact on the characteristics of the sound produced by the stringed instrument.

(13) Acoustic chamber can be obtained also combining together more than two elements, enclosing a hollow space into them, as is typically seen in most acoustic stringed musical instrument which use periphery element that extend between the first outer perimeter of the soundboard and the second outer perimeter of the back face of the body.

(14) As such, deformations or imperfections in the acoustic chamber 4 can have a negative impact on the sound produced by the musical instrument, and, as well, a unadulterated acoustic chamber, with a specific inner thickness and a geometrically perfect surfaces can improve the sound quality of the instrument itself.

(15) In the present invention, the body 4 shape and its differently rounded faces give the instrument a strong, brilliant, rich, sustained, authentic acoustic sound, also thanks to wooden processing technique and geometrically perfect body wall thickness that make the entire instrument free to vibrate.

(16) The front face of the body (soundboard) presents six sound holes 4l. The hollow body also permits the entire containment of the endpin 8 when the instrument is dismounted for transportation. The endpin 8 slides in and out of the body 4 through a specific hole 9 on the bottom of the back side of the body 4. The endpin housing 9 is equipped with a mechanical locking system that permits the user to set the preferred length of the endpin 8 extends out of the body 4.

(17) An important feature of the present invention is the two foldable shoulders 5 attached to the upper back part of the body 4, providing the correct overall balance and the proper player-to-instrument contact. As shown in FIGS. 1 and 3, the shoulders 5 substantially replicate the shape and the outline of the top portion of the traditional acoustic double bass body extending out from the body 4 laterally and backward. They make contact with the player body in the proper playing position, giving him the same feeling on the instrument as on a traditional double bass, replicating the exact tactile and visual references a trained double bassist requires for ease of performance: the invention is immediately playable and comfortable to anyone familiar with the traditional acoustic double bass.

(18) The shoulders 5 are removable and mounted on the back of the body 4, near the neck-body junction, exactly in the portion defined in FIG. 3 by the junction cover 4g, that covers the junction and holds static all the joint parts involved, without play and vibrations.

(19) Referring now to the FIGS. 4, 5, 6, 7, 8 and 9 the present invention will be described more specifically in every constructive detail following the assembly steps needed to bring the invention to its playable position, consistently with one of its main feature: the disassembly system that allows it to occupy the smallest space possible.

(20) As shown in FIG. 4 the fingerboard 3 can be unmounted from the neck 2, separating it from the neck fingerboard portion 2c. The neck 2 is equipped with a rigid core fixed to the fingerboard portion 2c and it works as a support for the two divided parts of the original fingerboard. In the preferred embodiment of the present invention, this rigid core support is made up of a t bar 2d with a specifically designed shape. In the present invention the t bar 2d is made of aluminum or like material that satisfies the needed resistance needed to support the fingerboard 3 junction. The t bar 2d is a rigid plate of thickness less than the fingerboard 3 thickness, it is presented as a rounded rectangle with a tapered bottom half from the middle to the end, it's oriented lengthwise to the neck 2 with the smallest radius extremity pointed towards the end part of the neck 2. Tapered bottom has circa 1.4 degree taper angle, which is the perfect declivity to allow the rigid bar 2d to slide in and out from the same shaped recess 3a on the fingerboard 3 easily and effortless, but also different taper angle may works as well.

(21) The height of the reinforcement ribbing is completely inserted in the neck 2, while the plate is covered by the neck fingerboard portion 2c from the extremity with the biggest radius to the beginning of the tapered portion that protrudes out of the end of the neck 2a. The edge of the plate 2d is entirely chamfered at 45, to be perfectly fitted into the dovetail slot 3a in a univocal orientation without play and imprecisions. To assemble the fingerboard 3 with the neck fingerboard portion 2c it is necessary to slide the shaped t bar 2d inside the fingerboard 3 along the dovetail slot 3a as deep as possible by hand, or until the hook of the latch toggle clamp 3b, fixed to the back side of fingerboard 3, can reach the pin 2e positioned on the plate 2d in proximity to the smallest radius extremity. Clasped the pin, it is sufficient to push down the latch toggle clamp 3b lever, which consequently pull the hook backward to the fingerboard 3 end extremity, but, being the hook blocked by the pin 2e, the result is that the fingerboard 3 is dragged toward the neck fingerboard portion 2c following the path defined by the dovetail slot 3a until the two fingerboard parts 3 and 2c meet each other joining perfectly and tightly at the transverse cut 2h in a single whole piece, as the standard stringed instrument fingerboard which it was before the cut.

(22) This junction is extremely stable and strong so that, together with the specifically designed transverse cut 2h, which split the original standard fingerboard perpendicularly to its length, doesn't show any kind of step or junction point perceptible by touch. This important feature allows the musicians to disassemble the fingerboard in two parts for easy transportation, without any negative tactile feedback on the fingerboard when it is be re-assembled for play.

(23) After having carefully described the fingerboard juncture, FIG. 5 shows the way to assemble the whole neck 2 (including the fingerboard 3) with the body 4 and all the correlated features.

(24) The upper end of the body presents a housing 4a that works as a lane, through the front and the back face of the body, where the end part of the neck 2a can be precisely accommodated and the neck 2 mounted in the playing position.

(25) The joint is essentially composed by a male part 2a, positioned under the back button 2g of the neck, precisely shaped to be housed into the slot 4a on the body 4.

(26) The neck presents a T hammer bolt 2b which come off its back 2g and that slides into a slotted hole 4f on a rigid plate 4b positioned on the back of the body. Tilting slightly backward the neck 2, the t hammer bolt 2b head can pass through the slotted hole 4f and then it clasp the neck 2 to the plate 4b once the neck 2 is tilted back to the front, in playing position. At this point, the neck 2 is limited from tilt towards the front beyond the defined played position by the resistance of the t hammer bolt 2b against the rigid plate 4b. In addition to this, the strings tension pulls the neck 2 towards the front, limiting the neck 2 from tilt backward, so that, when the strings are mounted, the neck 2 is firmly joined to the body 4 because is limited to tilt towards the front by the rigid plate 4b and, at the same time, limited by the strings tension to tilt backward.

(27) Back button 2g underside faces lean against the top horizontal face of the body, where there are two little neck grade adjustment screws 4c that can be screwed in or out equally to adjust the grade of the neck 2 forward and backward respect of the headstock orthogonal projection, or, unequally to also adjust the grade of the neck either towards the left or the right with respect to lengthwise centerline of the instrument, by changing the support points of the back bottom 2g. These adjustment of the grade of neck 2 have an impact on the distance of the strings from the fingerboard 3 which, thanks to this adjustment system, the user is able to adjust at his own preference before mounting the instrument and that will be stable along every assembly.

(28) This locking system allows the user an easy and quick neck assembly on the body with an accurate grade adjustment and a robust fastening.

(29) As described before, the present invention is fitted with two collapsible shoulders 5 that replicate the exact shape and outline of an acoustic double bass top portion of the body, as you can see in FIGS. 6 and 7. The shoulders are composed by an upper part 5b, that replicate the outline of an acoustic double bass body, and a lower part 5c that connects both the shoulders 5 to each other and to the body 4 with a thread sleeve 4f on the body back side by a threaded knob. The upper 5b and lower shoulder parts 5c are joined with two hinges 5d specifically designed and shaped to outline the shoulders 5 edges. In spite of their function being for support only, the shoulders lower part 5c matches the curvature of the upper part 5b of the same shoulder, to allow them to be folded over themselves through hinges 5d occupying the smallest space possible when in transportation arrangement.

(30) To join the shoulders 5 to the body 4, the upper part of the shoulders 5b is equipped with an L plate 5a positioned with the longest face on the upper extremity of the upper part of the shoulder 5b parallel to the width of the shoulder itself. The smallest face of the L plate 5a presents a keyhole slot 5f profiled to let upper juncture pin 4d pass through it and clasp the shoulders 5 to the body. Inside the neck/body/shoulders join area, that is defined by the area that can be covered by the cover 4g, there are also two further juncture pins 4e, below the upper ones, that have the function of blocking the rotation of the shoulders inwards, that rotate around the upper juncture pins 4d towards the center of the body. These lower juncture pins 4e are housed into a small semi-circular hole on the edge of the L plate 5a, limiting its rotation.

(31) As showed in FIG. 8, when the shoulders 5 are correctly assembled on the body 4, as described above, the shoulders lower parts 5c can be unfolded to the limit imposed by the mechanical stop of the hinges 5d and the junction holes 5e, positioned on the extremity of the shoulder lower parts 5c, which are centered on each other with the thread sleeve 4f and fixed to the body 4 with the threaded knob.

(32) Now the neck/body/shoulders join area can be covered by the cover 4g specifically shaped to outline the area, and fit with a soft vibration absorbing surface in the inner face to block all the juncture parts and to eliminate every possible vibration in that area, by squeezing against the area and by locking the cover with a threaded knob screwed in the threaded specific hole located in the middle of the plate 4b.

(33) In FIG. 9 is showed the locking system to lock the endpin 8 in the preferred length out of the body 4. In the present invention, the endpin 8 is not a stringed musical instrument standard endpin. It is specifically designed with a material which is allowed to be board on plane (unlike the standard metal endpin), and also, it is not perfectly cylindrical: it has a flat surface narrower than the endpin 8 diameter itself.

(34) On the back side of the body, on its bottom extremity there is positioned the endpin housing 9 that covers the inner housing pipe 9a that has the function of housing the endpin 8 in the correct angle and direction to let it be retracted properly inside the body 4 and drawn out in the correct position to ensure necessary instrument balance while playing. The pipe 9a presents a threaded hole perpendicular to its length that correspond to the hole on the endpin housing 9. Screwing in the endpin clamping knob 9c through the threaded hole on the inner pipe 9a, the threaded bar of the knob 9c pushes against the clamping bar 9b, contained inside the inner pipe 9a, consequently pushing against the flat face of the endpin 8, locking it in the preferred position, to avoid any possible sliding of the endpin 8 inside the body 4 under the weight of the instrument and the load of the musician in the playing position. The endpin 8 is fit with a non-slip tip 8a at its extremity that avoids the sliding of the instrument on the floor during the musician's performance.