US1685433A

US1685433A - Phonograph

Info

Publication number: US1685433A
Application number: US173674A
Authority: US
Inventors: Daniel D Mounts
Original assignee: Individual
Current assignee: Individual
Priority date: 1927-03-08
Filing date: 1927-03-08
Publication date: 1928-09-25
Anticipated expiration: 1945-09-25

Description

Y Patented SeptpZS, 1928.

unirse srarss PHONOGRAPH.

Application filed March 8. 1927. Serial No. 173,674..

This invention relates to phonographs, and has for its object an arrangement whereby the diaphragm 'of the sound box is at right angles and substantiailiT in alinement with the axis of the amplifying horn in order to obtain maximum sound with minimum distortion. n g

It is a further object ofthe invention to elii'i'iinr-.te the use of a movable tone arm and 1 connect the sound box directly to a fixed amplifying horn with the necessary radial movement between the turn-table andv the sound'box obtained by arcuate swinging of the turn-table relative to the fixed sound box.

It is a still further object of the invention to provide driving mechanism for the swinging turn-table, of extremely simple construction and adapted to counterbalance thevturntable so that it may freely swing responsive g@ to the travel of the stylus of the fixed sound box along the groove of the reproducing record.

Further objects of the invention will be readily understood lfrom the following der scription of the accompanying drawings, in

which:

Fig. 1 is a rear elevationv of the construction. j

Fig. 2 is a plan view,showing in dotted lines the arcuate swing of the turn-table to accommodate itself to the travel of the stylus of the fixed sound box along the Vgroove of the reproducing record.

Fig. 3 is a side elevation with the turntable swung to the position shown in dotted lines in Fig. 2.

The turn-table 1 and its driving mechanism which may be an electric motor 2, are mounty ed on opposite ends of a horizontal arm 3 having a vertical pivot 4 intermediate of its euds, whereby the driving mechanism and the turn-table counterbalance one another to permit free turning of arm 3 on its pivot. The pivotal mounting includes a bearing 5 in a supporting block 6 and suitable anti-frictional means 7 to insure free arcuate swinging of arm 3 responsive to the travel `of the stylus of a fixed sound box along the groove of the usual reproducing record mounted on the turn-table. I

Turn-table 1 is adapted to revolve freely, and for this purpose has a depending pivot 10 journaled in a vertical bearing 11 at the end of arm 3. preferably with anti-frictional means 12 at the bearing. The turn-table is also provided with the usual stud 12a at its upper surface adapted to center the usual reproducing record 13 which is mounted on the lturn-table for rotation therewith.

14 in vertical position as shown in Figs. 1

and 2. Y

The amplifying horn 20 of the phonograph is rigidly supported as shown at 21. and the usual sound box 22 is fixed at right angles and in substantial alinement With the axisof the ho-rn as shown in Figs. 2 and 3, the parts being arranged for travel of stylus 23 of the fixed sound box along the groove of record 13 in usual manner as a result of the free arcuate swinging ofthe turn-table.

The sound box may lbe raised and lowered slightly for engaging the stylus in the groove of the record, and for this` purpose the sound box has to-ne arm `24e projecting at right angles therefrom, the tone arm being adapted for limited pivotal movement on a horizon-- PATENT orifice tal axis in a cooperating coupling 25 at the innerend of horn 20, the parts being so arranged that sound is transmitted directly `from the sound box into the horn along substantially a straight line as shown in Figs.

2 and 3.

I thus eliminate distortion and obtain maximum sound reproduction, since the sound box is fixed at right angles to the axis of the amplifying horn and communicates directly therewith along a substantially straight line7 the necessary radial movement between the reproducing record and the fixed sound box being obtained by arcuate swinging of the turn-table in respo-nse to the travel of the stylus along the groove of the reproducing record mounted on the turn-table.

, I claim:

1. Ina phonograph7 a supporting arm pivoted intermediate of its ends. a turn-table on one end of the arm, rotary drive mechanism mounted on the opposite end of the arm so as to countcrbalance the turn-table. a frictional driving connection between the Adrive mechanism and the turn-table, and a stationary sound box having a stylus adapted to engage vthe `groove of a reproducing record mounted on the turn-table for swinging the supporting arm so as to radially move. the reproducing record relative to the stationary sound box in v gli mounted on one end of the arm, rotary drive Y mechanism mounted on the oppcSit-e end of the arni so as to counerbalmice Jhe turn-table, I

a drivingconnection between the drive mechanis'inandthehun-tabl@ und :L Stationary 10 vsoundlooX'f'lmving a stylus adapted to engage the groove of'a reproducing 4record mouned on tlie tuin-able lor swinging' the Supper-ring Varm so as to radially nuove lie reproducing record relitiveio lille' Sutionnry sound box in accordance with travel of the stylus along the groove of the record.

In testimonywhereof lie has afixcd his signature to this speciliction.

DANIEL D. VMoUNjre