US1422310A - Phonograph - Google Patents

Description

TMTED STATES eaTewT canoe.

JAMES SHAW, 0F TORONTO, ONTARIO, CANADA.

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T 0 all whom it may concern:

Be it known that I, JAMEs- SHAW, a subject of the King of Great Britain, of the city of Toronto, in the county of York, in the Province of Ontario, Canada, have invented cer tain new and useful Improvements in Phonographs, of which the following is the specification.

My invention relates to improvementsin phonographs and the object of the invention is to devise means for increasing the tonal qualities of the instrument to take away all harshness and to mellow and enrich the tone. My invention consists essentially of the following arrangement and construction of parts as hereafter more particularly explained.

Fig. 1 is a cross sectional view through the upper portion of the phonograph cabinet showing my device located therein.

Fig. 2 is a sectional view on line 22, Fig. 1.

Fig. 3 is a diminutive perspective view of my device for increasing the tonal qualities of the instrument.

In the drawings like characters of reference indicate corresponding parts in each figure.

1 indicates the casing or cabinet of the phonograph. 2 indicates the motor board which is supported upon rails 3 and 4 secured to the opposing sides of the casing 1. The back portion of the motor board is cut away to form an opening 4 extending from one side to the other of the casing.

5 is a hollow bar-like member which forms my device for increasing the tonal qualities of the instrument and which forms a support for the tone arm base 6 and from which the horn 7 of the instrument is suspended.

The upper wall 8 of the member 5 is convexed or bellied similar in form to the upper wall of a violin body. 9 is the lower wall of the member 5, such wall being flat and extending between the rails 3 and 4 forming the motor board support. It will be noted on referring to Fig. 1 that the upper wall 8 extends at its ends into close proximity with the side walls of the casing 1. The ends of the wall 8 are provided with suitable felt rolls 10 and 11 so as to prevent actual contact between the ends of the member 5 and the wall of the casing 1. The longitudinal edges of the wall 8 are also provided with felt rolls 12 and 13 to prevent contact between the member 5 and the edge of the motor board 2 Specification of Letters Patent. Patented July 11., 1922. Application filed September 2, 1921. Serial No. 497,908.

onv'one side and the wall of the casing on the other.

14 and 15 are bars which are secured respectively to the under face of the top wall 8 at each end and to the upper face of the bottom wall 9 so as to connect the ends of the top wall and bottom wall together. Each bar 14 and 15 is provided with a rabbet groove 16 into which the bars 3 and 4 respectively fit thereby forming a support for my device 5. 17 are felt strips interposed between the faces of the bars 14 and 15 and the opposing faces of the rails 3 and 4. 18 and 19 are bars which extend between the rails 3 and 4 and are secured to the upper face of the bottom wall 9 along its longitudinal edge. 20 and 21 are felt strips secured to the upper face of the bars 18 and 19. 22 and 23 are strips which are secured to the lower face of the upper wall 8 along its longitudinal edge so as to fill the space between the wall 8 and the bars 18 and 19. 24 is a lining of canvas which is glued or otherwise suitably secured to the inner face of the member 5. 25 is an orifice formed in the centre of the wall 8 corresponding in size to the orifice of the tone arm base 6.

26 is an orifice formed in the centre of the wall 9 in vertical alignment with the orifice 25. 27 is the neck of the horn which extends through the orifice 26 and is secured at its upper end to the wall 8. The lower end of the neck 27 fits into the small end of the horn 7 in the usual manner, such horn being formed of wood and having its front and rear edges 28 and 29 bevelled as indicated in Fig. 2 its side edges being horizontal as i11- dicated at 30 and 31 in Fig. 1. 32 and 33 are inclined walls secured at their upper ends to the bottom wall 9 and at their lower ends to the upper edges 30 and 31 of the horn. 34 and 35 are walls also secured at their upper ends to the lower face of the wall 9 and at their lower ends to the bevelled edges 28 and 29 of the horn, their end edges being secured to the end edges of the walls 32 and 33. By this means a chamber is formed around the neck 27. From this description it will be seen that the member 5 is supported at its ends within the casing or cabinet 1 of the phonograph and with the horn 7 suspended therefrom and the tone arm base 6 supported thereby. By this means it will be seen that a hollow reverberating chamber is pro- Vided, supporting the sound producing mech anism and serving to improve the tonal qualities of the sound emitted, eliminating all harsh and rough sounds and clarifying, mel lowing and enriching the tone.

What I claim as my inventlon 1s:

1. In a phonograph a hollow bar-like member supported at its ends within a phoi nograph cabinet and having an orifice in its upper wall around which a tone arm base is adapted to be secured and having an orifice in its lower wall in vertical alignment with the orifice of the upper wall and around which lower orifice a horn is adapted to be secured for suspension, and a tubular connection extending between the walls and into the orifices.

2. In a phonograph, a casing, rails located 15 at each side of the casing, a hollow bar-like member provided with rabbetted ends adapted to rest upon the said rails and having an orifice in its upper wall around which a tone arm base is adapted to be secured and an 20

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