US1420668A - Phonograph - Google Patents

Description

8.1. ROGNLIE.

PHONOGRAPH.

APPLICATION FILED JUNE 10, 1920.

1,420,668. PatentedJune 27,1922.

2 SHEETSSHEET I.

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PHONOGRAPH.

APPLICATION FILED JUNE 10, 1920.

gill/6172142 UNITED STATES SEVERIN'JOEL ROGNLIE, F LEWISTOW N, MONTANA.

PHONOGRAPH.

Specification of Letters Patent. Patented 2 7 192 Application filed June 10, 1920. Serial No. 387,926. I

T 0 all whom it may concern:

Be it known that I, SEVERIN JOEL ROGNLIE, a citizen of the United States, and a resident of Lewistown, in the county of Fergus and State of Montana, have invented certain new and useful Improvements in Phonographs,

' of which the following is a specification.

My invention is an improvement in phonographs, and has for its object to provide mechanism for connection with a phonograph of any character, for providing a greater variety of tone, wherein, in addition to the main horn, there is an auxiliary trumpet horn opening at the back of the cabinet, to produce a distant, trumpet effect.

In the drawings:

Figure 1 is a vertical section through a phonograph cabinet provided with the improvement;

Figure 2 is a similar view at right angles casing 7 held by the partition and the main horn or amplifier 8 is connected with this casing, the said amplifier extending downwardly and outwardly in the usual manner, having its large opening facing toward the front and bottom of the phonograph cabinet.

A sounding board 9 is hinged to the lower wall of the bell of the horn, as shown at 10, and this sounding board, which is curved from rear to front, is adapted to be raised and lowered, to vary the volume of the tone. As shown more particularly in Figure 1, the horn is rectangular in cross section, the side walls of the horn at the bell.

end abutting the inner faces of the sides of the cabinet, and the sounding board is raised.

and lowered by means of flexible members 11, which are connected to the corners of the board. 'These flexible members pass upwardly and wind on reels'12, which are secured to the'ends of a shaft 13 journaled in the cabinet, and rovided at one end outside of the cabinet w1th a crank 14 for convenience in turning the same. It will be evident that by turning the crank in the proper direction the sounding board may be raised and lowered. The side edges of the soundmg board move in close contact with the side walls of the cabinet, there being clearance, however, to permit easy movement.

A trumpet shaped horn or amplifier 17 is arranged in rear of the amplifier 8, the said trumpet shaped amplifier being connected at ts upper end to the casing 7 and opening at ts lower end at the rear of the cabinet. At its upper end the trumpet amplifier has a lateral extension 18 which fits about an openmg in the casing 7, a gasket 19 being arranged between the extension and the casing at the opening, and at its lower end the amplifier has a cross head shaped portion 20 which fits within an opening 21 at its rear face in the rear wall of the cabinet.

The rear wall of this extension 20 has openings, as clearly shown in Figure 2, for permitting the escape of sound waves, and it will be noticed, referring to Figure 1, that this extension 20 is of about the same length as the diameter of the large end of the amplifier 8. The trumpet is clamped to the casing 7, by means of a U-shaped member, consisting of a body 22 extending transversely of the trumpet, and arms 23 which extend on opposite sides of the casing 7.

The trumpet has an undercut lug 24 be- I neath which the body of the clamping member is engaged, and the arms are engaged with pins 25 on the casing 7. Referring to Figure 3, it will be seen that the arms 23 are recessed at the pins 25 and that when in place the plane of the U-shaped clampinclines downwardly from the lug 24 toward the free ends of the arms. The arrangement is such that when the arms 23 are engaged with the pins 25, with the trumpet lug 24 engaging the body of the clamp, the trumpet will be firmly clamped to the casing 7. The notches in the arms 23 resist movement of the clamping member toward the lug 24, and the inclination of the plane of the clamping member assists also in resisting this motion.

A valve or damper 26 is arranged in the casing 7, the said valve being hin ed at the bottom of the opening with whic the extension 18 of the trumpet isconnected. The pintle 27 of the hinge connection of the valve extends through a side wall of the cabinet and has a handle, indicated at 30,

' of the dotted line positions of the said figure, to provide a communication between the casing 7 and the horn 8 or the trumpet 17, or both, or to close the communication between either and the casing.

A partition 28 is arranged transversely of the cabinet in inclined position, just above thelevel of the free end of the amplifier 8, the said partition inclining upwardly toward its forward edge to deflect the sound waves downwardly and outwardly, and a shelf 29 is arranged above the partition.

In operation, when it is desired toplay in the usual manner, the valve 9 is opened and the valve 26 is moved into position to close the opening between the casing 7 and the trumpet. The sound waves now travel in the usual direction through the amplifier 8.

The loudness of the tone may be regulated by means of the sounding board 9. If it is desired to produce a trumpet eflect the board 9 may be closed or the valve 26 may be movedinto the full line position of Figure 4. A combination between the trumpet effect and the full tone effect may be produced by changing the position of the valve 26 and by changing the position of the valve 9. Since the trumpet opens at the rear of the cabinet and since the trumpet is of much less area than the amplifier 8, the volume will be less, giving a subdued effect of distance.

I claim:

The combination with a phonograph casing, of a downwardly and forwardly directed amplifying horn arranged entirely within the casing and having its lower end contacting with the sides of the casing, a longitudinally curved sound board hinged to the horn at the rear side of the same and extending forwardly for directing the sound waves forwardly, a pair of flexible elements secured to opposite sides of said sound board, and means for directing said flexible elements vertically for controlling said sound board, said sound board having contact with the sides of said casing and being arranged entirely within the casing.

SEVERIN JOEL ROGNLIE.

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