US1908613A -Stringed Musical Instrument
May 9, 1933.
1,908,613 STRINGED MUSICAL INSTRUMENT
Filed Feb. 16, 1932 er stringed instruments of a like nature,
Patented May 9, 1933 UNITED STATES PATENT OFFICE STRINGE-D MUSICAL INSTRUMENT
Application filed February 16, 1932, Seria1 No. 593,269, and in Great Britain April 9, 1931.
INVENTOR: Mario Maccaferri
DATE FILED: 02/26/1932
Improvements in Guitars and Stringed Instrument
This invention relates to stringed instruments having sounding boards or their equivalents, and particularly, although not exclusively, to guitars, violins, mandolins and others and has for its principal object to increase the volume of sound emitted by such instruments and to enhance the projecting or carrying power of the instruments and to improve their tone.
One object of the invention is to construct an improved musical instrument with an auxiliary sounding-box, chamber or the like located beneath the sounding board or harmonic or vibrating base or sounding board of the instrument so that the normal sounding-box, belly, or body of the instrument includes behind or within it an auxiliary sounding-boxfixed to or integral with the sounding board, harmonic-table or the like.
Other objects of the invention relate to means for reflecting or directing the sound from the outer and inner sounding-boxes,
chambers or the like along the channels or the line to openings, in the sounding board, so that the sound waves pass through the sound holes. These reflecting or directing means may have any suitable shape, for example they may be of cup shape or have double curved walls, and in some cases the sound from one of the sounding-boxes may be directed in the opposite direction to the sound from the other sound-box.
1931-04-09: Priority to GB1908613X
1932-02-16: Application filed by Maccaferri Mario
1933-05-09: Application granted
1933-05-09: Publication of US1908613A
1950-05-09: Anticipated expiration
Status: Expired – Lifetime
Sound illustration for internal resonator
The strings transmit the vibration to the bridge that in turn moves the soundboard creating sound. The sounds from the interior chamber is then directed out through the sound hole.
(5)-Typical Sound Opening
(6)-Chamber or Auxiliary Sounding-Box
(7)-Channel or Space
(8)-Curved Reflector or Director
(9)-Base or Extension of the Chamber
(10)-Sound Chamber Opening
In order that the invention may be better understood, it will now be described with reference to the accompanying drawing in which Fig. 1 shows an elevation partly in section of a guitar-like musical instrument constructed according to the invention, and
Fig. 2 shows a side sectional elevation of Fig. 1, the same reference numbers thereon referring to like parts in the figures.
In the drawing, (3) is the sounding board of the main sounding-box or chamber i of the instrument which has the ordinary sound opening (5) therein. This sounding board is generally referred to as the harmonic member and embodies the bridge (3) over which the strings pass under tension.
Beneath this harmonic-table or face wall (3) is located supplementary or auxiliary sounding-box or chamber (6) having the shape substantially as shown in Fig. 1, whereby a channel or space (7) is left around the sides and base of the said auxiliary box, or between its exterior and the interior of the normal sounding-box (4).
A curved reflector or director (8) is formed from a suitable piece and located to direct the sound from the space (7) to the opening (5).
The auxiliary sounding-box or chamber (6) has its base or side extended at (9) to form a curved reflector or directing part suitably located with relation to the reflector (8) so as to afford an opening leading into or towards the hole (5). By means of these reflectors the sound from the auxiliary sounding-box or chamber (6) is directed through the hole or opening (5).
It will be realized that other openings from the inner sounding-box or chamber to the exterior may be provided, for example the harmonic-table or face-wall may have openings therein, communicating directly with the interior of the said auxiliary sounding box or chamber. In certain cases, however, it is preferred that the sound from the auxiliary sounding-chamber or box should be directed to the same sound opening or openings as those from the normal or main sounding box or chamber.
Stiffening bars (not shown in the drawings) may be used in a well-known manner to keep the shaped parts from distortion.
Although the invention has been described as more particularly applied to a guitar-like instrument, it will be obvious that it may as readily be applied to instruments of the violin class.
In the case of a piano or banjo, the sounding-box may be arranged as in the guitar which is shown on the accompanying drawings, and this arrangement applies to all 95 stringed instruments whatsoever.
Further, although the invention has been more particularly described with reference to main sounding-boxes or chambers, these boxes or chambers may be replaced by main sounding-boards or the like.
For example, in place of a closed main chamber, a main sounding-board may be used and in conjunction therewith, an inner chamber or box may be utilized in desired proximity to sound openings, where provided.
The invention is not limited to the precise forms or details of construction described, as these may be varied to suit particular cases.
What I claim and desire to secure by Letters Patent of the United States of America
1. A stringed musical instrument comprising a box-like structure, one Wall of which constitutes a sounding-board, a bridge on said wall, means for tensioning the strings over said bridge, an inner sounding-box secured to the under side of said sounding-board and of such a size as to leave a comparatively narrow channel around said inner soundingbox on three sides, an aperture on another side Wall of said inner box and an aperture in the adjacent portion of said soundingboard.
2. A stringed musical instrument comprising a sounding-board, a bridge secured thereto over which the strings pass, an outer sounding-box associated with said soundingboard, an inner sounding box carried by said sounding-board within said outer soundingbox, apertures in said inner and outer sounding-boxes and reflecting means within the outer sounding box located so as to direct the sound emanating from the inner sounding-box to the outside of the instrument.
3. A stringed musical instrument comprising inner and outer sounding-boxes arranged one within the other, a bridge on the outer face wall of the outer sounding-box over which the strings pass, an aperture in the side wall of the inner sounding-box leading into the outer box, a reflector within the outer sounding box opposite said aperture and an aperture in said outer face wall through which the sound passes to the outside of the instrument.
4. A stringed musical instrument comprising inner and outer sounding-boxes, the former of broadly four sided form and of such a Size as to leave a channel-like space between itself and the outer sounding-box on three sides, an aperture across the fourth side of said inner sounding-box, a curved reflector within the outer sounding box and opposite said aperture, a bridge fixed to one face wall of the outer sounding-box and an aperture in said face wall opposite said curved reflector.
5. A stringed musical instrument comprising a sounding-board, a bridge fixed to said sounding-board over which the strings pass, an outer sounding-box associated with said sounding-board and of which the latter forms one wall, an inner sounding-box of dish form secured under said sounding-board so that the latter forms one wall of said inner sounding-box, a comparatively long and narrow aperture near the lower portion of one side wall of said inner sounding box, a curved reflector element surrounding said aperture formed b a projecting lip on said inner soundingx, a separate curved reflector opposite said aperture and an aperture in the sounding-board opposite said separate curved reflector.
6. The combination with a musical instrument having several strings stretched between a tensioning device and a bridge, of a sounding board, an outer sounding-box one wall of which is comprised by said board, an inner soundin -box of dish form secured under said sounding board so that the latter forms one wall of said inner box, said inner box having four main sides three of which lie comparatively close to the outer box, an aperture on the fourth side of said box extending along the lower edge of said side, an extended lip on the under face wall of said inner box with a curved forward portion, an aperture in the sounding-board near the aperture in the inner box and a reflector within the outer sounding box to direct the sound leaving the inner box to the aperture in the sounding board.
7. A stringed musical instrument comprising inner and outer sounding-boxes, means for supporting and tensioning the instrument.
strings, a bridge over which the strings pass and by which the vibrations of the strings are communicated to said sounding-boxes, an aperture in the inner sounding-box leading into the outer sounding-box, a further aperture in the latter box and a reflector disposed to direct the sound leaving the inner sounding box to the outside of the instrument.