US1792830A - Phonograph adapter - Google Patents

Description

Feb. 17, 1931. c GQUDY 1,792,830

PHONOGRAPH ADAPTER Filed July 16 1930 INVENTOR ATORI IEY Patented Feb. 17, 1931 UNITED STATES PATENT OFFICE CARL I. GOUDY, OF I'L'USHING, YORK, ASSIGNOR TO PAOENT ELECTRIC COEPANY,

INC., 01 NEW YORK, N. Y., A CORPORATION OF NEW YORK PHONOGRAPH ADAPTER Application filed July 16,

The objects of this invention are to enable the quick conversion of phonographs such as used for talking pictures, over from theplaying of the large 16" records to the playing of the newer, smaller 12" so-called .flong playing records and to accomplish this 1n a sunple practical way with inexpensive easily 1nstalled mechanism.

The smaller, long playing records start nearer the center than the larger records.

Consequently, a tone arm which is set for playing the larger records with the plckup needle substantially tangent to the sound groove at the start, will locate the needle inside of the tangent at the start of a smaller record, making the needle track incorrectly and giving it a tendency to jump out of the groove.

The present invention involves the provision of simple means for re-setting the tone arm to bring the needle nearer the record center and hence into the proper substantially tangential relation for the start of the smaller record grooves.

Other novel features of the invention and the details of construction will appear as the specification proceeds.

The drawing accompanying and forming part of the specification illustrates one practi- 39 cal embodiment of the invention, it being understood that the actual physical structure may be modified as regards this disclosure, within the broad spirit and scope of the invention. 5 Fig. 1 is a broken plan view illustrating the invention in use on a sound picture phonograph; Fig. 2 is an enlarged broken sectional detail view of the special adapter bracket.

In Fig. 1, the turntable of a phonograph is represented as 3, and the pickup unit is shown at 4 carried by a swinging arm 5 pivotally supported at its outer end on an outstanding bracket arm 6.

The pivotal support for the pickup arm comprises the pivot stud 7 screwed in one end of a link 8, the opposite end of this link being pivotally engaged on the bolt 9.

The bolt 9 is shown secured by nut 10 and washer 11 in a rubber bushing 12 seated in a 50 socket 13 in the end of a supporting arm 6 1930. Serial no. 468,310.-

and forms in fact, a replacement art for the pivot stud usually employed in t is location as a mount for the tone arm for playing the 16" records.

To convert a machine designed for the playing of the larger records over to the proper relation of parts for playing the smaller records, therefore, with this invention, it is only necessary to take out the old pivot stud and rubber bushing seated in the socket 13 of the supporting arm and to replace that with the special mounting bolt 9 and bushing 12 carrying the link 8 with the ofiset pivot stud 7, arranged as in Fig. 1,'with the link inclined inwardly, so as to bring the needle of the pickup into substantially tangential relation to the starting portlon of the record groove. By turning the link on its mounting bolt, the distance between the needle and record center and the tangential relation of the needle to the beginnlng of the record groove may be very accurately set. If necessary to re-set the machine for the larger size records, this can readily be done by loosening nut 10 and turning the link 8 to carry the swivel stud 7 out to a position of the same radial distance from the turntable center as the bolt 9, the nut being then tightened to secure the mounting stud with the tone arm carrying the needle ready to cooperate with the larger record. The citset pivot stud 7, is preferably constructed similarly to the pivot stud which it replaces, so that the same swivel mountings indicated generally at 14 will suflice for either stud, the tone arm being shiftable from one to the other without any change of structure. The

substitute parts are of mm le sturdy and in-,

expensive design and the su stitution is easily eliected without requiring special tools or special mechanical skill.

What is claimed is:

1. An adapter for phonographs comprising a mountin bolt, a laterally extending arm supported y said bolt and a tone arm supporting pivot stud upon the free end of said arm.

2. As a new article of manufacture, a

link and a tone arm sulplgorting mount on the opposite end of said 1i 3. A substitute mount for a phonograph tone arm, comprising a mounting bolt a link extending in ofiset relation from and bolt and a short stud on said link and constructed to provide a pivotal mount for a phonograph tone arm.

4. In combination with a phonograph turntable and a tone arm mounting bracket, a bolt mounted in said bracket, a link secured by said bolt and extendin in ofiset relation from the center of said %01t, a short stud fixed on said link and a tone arm swivelled on said stud.

5. In combination with a phonograph turntable and a tone arm mountmg bracket, a bolt mounted in said bracket, a link secured by said bolt and extending in oifset relation from the center of said bolt, a short stud fixed on said link, a tone arm swivelled on said stud, said link being pivotal about the bolt center to diflerent angular relations to enable setting of the tone arm pivot to difi'erent radial distances and inclined relations to the turntable center to enable setting of a pickup unit on the tone arm to substantial tangential relation to the starting points of difierent record grooves.

In testimony whereof I aflix my signature.

CARL F. GOUDY.

moaned

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