US1423387A - Phonographic sound box - Google Patents

Description

L. J. BERGDOLL (NOW BY JUDICIAL CHANGE OF NAME L. J. BERGSON). PHONOGRAPHIC SOUND BOX. APPLICATION FILED DEQCJI, 1916.

' 1A23,387 Patented. Jill 1 1922.

Wane

LOUIS :ronnnnnsnonn, Now BY JUDICIAL CHANGE or NAME LOUIS JOHN :enneson,

or rnrnannrrnra, PENNSYLVANIA. I

PHONOGRAPHIC SOUND BOX.

Specification of Letters Patent. Pa,t@11t@{1J 11ly 18, 1922,

Application filed December 11, 1916. Serial No. 136,218.

Philadelphia and State of Pennsylvania,

have invented certain new and useful linprovenients 1n Phonographic Sound Boxes,

of which the following is specification, reference being had therein to the accompanying drawing.

It is an ob ect of this inventionto provide a phonographic sound box, for use with the usual types of phonographic and other simi lar sound-reproducing machines, thatftroni a record will reproduce mus c and other re corded sound most articulately and faith li'ully, and that will avoid to a minimum the part reproductory vibrations to the @151 production otsounc occasioned by the usual scratch or contact interference or" the styluspoint or equivalent part on the record.

With this object in view, the invention provides between the sound-box and styluspoint means so arranged as to absorb shocks imparted by inequalities in the record. to the stylus-po1nt in a plane substani'nallyparallel with that of the diaphragni.

hen read in connection with the descri 'ition herein, the details oi? construiztion and arrangement of parts contemplated by the invention will be apparent from the accompanying drawing, forming part hereof, wherein an embodiment of the invention is disclosed, for purposes of illustration;

. lVhile the disclosures herein now are con sidered to exemplify a preferable emhodi ment of the invention, it is to be understood that it is not the intention to be limited nocessarily thereto in interpretation of the claims, as changes and alterations within the limits of the claims can be made without departing from the nature and spirit or? the invention.

Like reference-characters refer to corresponding parts in the views of the drawing, of which Figure 1 is a View in elevation;

Fig. 2 is a sectional view on the line X-Y, Fig. l;

Fig. 3 is a view of parts as seen when lookin j in the direction of the arrow, Fig. l.

aving more particular reference to the drawing, 4 designates a portion of a recorddisk arranged to be rotated on a shaft 5 in a manner common in the art, 6 designates a sound-box of usual form having a diaphragm 7 Wlth' whlchone end of a stylusbar 8 is connected, and 9 is the sounder-outlet. p

The other end of the stylus-bar is connected to the sound-box by a s iring-con'- trolled pivot -joint that includes a member 10 to which the stylus-bar is connected. I This member is held against pivot-points 11 ot' the box by springs 12 extending laterally from the member and engaged by screws 13 that turnli'nto extensions l l olt't'he box. The parts are disposed in a manner to permit the member 10 to rock under restraint of: the

springs 12 in a direction to permit the stylusbar to v brate 1n a plane substantially perpendlcular tothe diaphragm and thus im phragm. Thus the axis of oscillation and vibration is substantially parallel with the plane of the diaphragm.

The member 10 has an arm 15 extending substantially at right angles therefrom on each side, and this arm carries pivot-points 16 against which a member 17 held by springslS. One of the springs 18 extends from each side of the member 17, and it is engaged in its free end portion by a screw 19 turned into the arm 10. disposed in a manner to permit the member 17 to rock on the'pivot-points 16 under the restraint of the springs 18 in a direction to permit a socket 20on the member carrying a stylus-needle or other record-engaging part 21 to vibrate in a plane substantially parallel to the plane of the diaphragm and in a plane substantially perpendicular to that of the record-disk. Accordingly, the axis of oscillation of the member carrying the record-engaging part is substantially parallel to the plane of vibration of the stylus-bar and substantially perpendicular to the diaphragm and the axis of oscillation of the member 10 and to the plane of vibration of the stylus-bar.

Inasmuch as all phonographic records, by reason of their composition and formation, are more or less rough in and along the groove in which the stylus-needle point or other record-engaging part travels, there is a tendency in the record to throw the styluspoint or the like up and away from the part of the groove in which it travels, this as a The parts jare' result of the inertia of the stylus-needle or the like and its carrying-socket, and the point thereby is caused to miss or jump a considerable portion of the sound-undulations recorded upon the record. This is especially so in the case of the recorded finer or over tones. y

The pivot-joint by which the socket is connected and that permits the needle or the like to vibrate in aplane substantially perpendicular to the record is provided to overcome thisdisadvantage. This action of the needle or equivalent part, however, is cheered in one direction by one or the springs 18 and in the opposite direction by the other spring; 18, and the springs maintain the needle or the like in a normal posi tion and cfiectually neutralize the inertia of the socket and the needle or other rec.- ord-engaging part carried thereby. The result is that the record-engaging part rides snugly in the groove, as practically allme chanical reaction is eliminated, and the scratch that ordinarily results in extraneous vibrations in the sound-box is minimized, since the point or the like no longer hops along the-record-groove, but glides smoothly therein.

It is to be noted that this pivot-joint does not permit flexure of the socket and recordengaging part rarried thereby in any direc tion other than in a plane substantially perpendicular to the record-surface or substantially parallel with the plane of the diaphragm. Therefore, the pivot-joint by which the socket is connected in no way in terteres with the action of the pivot-joint of the stylus-bar in permitting the transmis sion; of all vibrations of the record-engaging part to the diaphragm in a plane perpcndicular thereto; but the socket pivot-joint eliminates or absorbs vibrations of the rec'- ord-engaging part in the plane parallel to the plane of the diaphragm and thus itminimizes the transmission to the stylus-arm and thus to the diaphragm of properties imparted to the record-engaging part by:

roughness or other conditions in the record not pertaining to the recorded sound.-

Havin thus described in invention to i 9 what I claim as new, and desire to secure by Letters Patent, is

1. In combination with a sound-box hav ing a diaphragm and a stylus-bar connected therewith, a piVotall'y-mounted member connected with said bar arranged to impart vibration thereto in a plane substantially perpendicular to said diaphragm in response to properties in a record pertaining to recorded sound, a holder for a record-engaging part pivotally mounted on said member arranged to vibrate only in a plane sub phragm, and a spring restraining rocking movement of said holder in both directions.

3. In combination with a sound-box having a diaphragm and astylus-bar connected at one end to said diaphragm, a spring-controlled flexibly-mounted stylus-bar holder connected to the other end of said stylusbar and permitting vibration thereof in a plane substantially perpendicular to said diaphragm, a member fienibly'monnted on said stylus-bar holder to rock in a (111130 tion substantiallyparallel with said diaphragm, a spring restraining rocking; movement of said member in both directions, and a holder for a record-engaging'part on said membeia I r In testimony whereof I afiiximy signature in presence of two witnesses.

LoUIs JOHN BnneDoLL.

Now by judicial change of name Louis J 01m Berg son.

Witnesses a EARL T. KRAMER, Lnwrs Lnsun.

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