US1216614A

US1216614A - Tone-arm support for talking-machines.

Info

Publication number: US1216614A
Application number: US10948916A
Authority: US
Inventors: Louis K Scotford
Original assignee: Individual
Current assignee: Individual
Priority date: 1916-07-15
Filing date: 1916-07-15
Publication date: 1917-02-20
Anticipated expiration: 1934-02-20

Description

L. K. SCOTFORD TONE ARM SUPPORT FOR TALKING MACHINES.

APPLICATION FILED JULY I5. I916- Patented Feb. 20,1917..

a A o vv// I I I 'l 4 7732 6 M22520? 0 rd MJa/J I LOUIS x..sco'rronn,or CHICAGO, I'LLINOIS.

TONE-ARM SUPPORT FOR TALKING-MACHINES.

To all whom it may concern; I I Be it-known that I, LOUIS K. Sco'rroRD, a

v citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Tone-Arm Supports for Talking-Machines, of which the follow- F ing is a specification.

My invention relates in general to talking machines and more particularly to means for pivotally supporting the tone arm of such machine.

The sound box of a disk record talking machine must be so supported as to be movable vertically and horizontally in order that it may be moved into and out of engagement with the record, and when in engagement with the record moved radially relatively thereto. These movements of the sound box are obtained by so supporting the tone arm, on which the sound box is carried, as to swing laterally and vertically either in whole or in part according to whether the tone arm comprises one rigid section or two sections pivotally connected so as to permit the end section which supports the sound box to swing verticallyn My invention relates to tone arms of the former type, namely, that in which the tone arm comprises a single rigid section, the supported end of which is mounted to swing both horizontally and vertically.

The primary object of my invention is to provide an improved pivotal support for the supported end of the tone arm of a talking machine.

A further object of my invention is to provide a support for the tone arm of a talking machine by which it may freely swing both vertically and horizontally with a minimum of resistance. I

A still further object of my invention is to provide a tone arm support which will be simple in construction, convenient in use,

and efficient in operation.

My invention will be more fully described hereinafter with reference to the accompanying drawing, in which the same is illustrated as embodied in two convenient and practical forms, and in which:

Figure 1 is an elevational view of a portion of the tone arm of a talking machine, a part thereof being shown in a vertical sec tion. v

Fig. 2 is an celevational and part sectional Specification of Letters Patent.

' designate similar of the drawing.

-a shoulder 6 Patented Feb. 20, 1917.

Application filed July 15, 1916. Serial N 0. 109,489.

view of the keeper ring of the tone arm support, detached.

Fig. 3 is a plan view of the supported end of the tone arm, part being broken away.

Fig. 4 is a plan view of the under side of the keeper ring of the support.

ig. '5 is a vertical sectional view through a modified form of my invention, the support and the adjacent portion of the tone arm being shown.

Fig. 6 is. an enlarged detail Vertical section of the modification shownin Fig. 5, taken on line 66 of Fig. 7.

Fig. 7 isa' partial horizontal detail section on the line 7-7 of Fig. 5; and

Fig. '8 is a complete horizontal sectional View on line 7-7 of Fig. 5, the retaining ring being shown in a different position relatively to the support fromthat shown in Fig. 7. I i

Similar reference characters are used to parts in the several figures Referring to Figs. 1 to 4 inclusive, reference letter A indicates the tone arm of a talking machine of any suitable construction. VVhileI have shown a tone arm of a certain specific form,'yet it will be understood that my invention is not limited to any particular shape or form of tone arm, but is applicable generally to tone arms of the type in which the supported end is mounted to swing vertically and horizontally. B designates a tubular support provided with a circular flange b at its base, which is suitably secured upon the table of the talking machine. The upper end of the support B is cut away interiorly so as to form v Trunnions 0 project from diametrically opposite points on the lower end of the tone arm, such trunnions being preferably formed by the ends of a rod 0 which extends transversely across the end a of the tone arm. The trunnions 0 rest upon the shoulder b and serve as the sole means for supporting the tone arm and for permitting it to swing. horizontally as well as vertically.

D designates a keeper ring of a size to o fit within the reduced upper end of the tubular support B with its lower edge (Z resting upon the shoulder 6 and with its cylindrical inner surface registering with the inner surface of the tubular support B. The ring D is provided with'an outwardly projecting peripheral flanged at its top,

which over-lies the reduced upper end of the support B. Notches, or recesses, d are provided in the lower edge of the ring D at diametrically opposite points thereof, such no'tches being of a size to loosely surround the trunnions 0 on the lower end a of the tone arm, and thereby retain the portion of the tone arm which projects within, the support in concentric relation thereto. In order to attach the keeper ring D to-the supportB and at the same time permit it to freely rotate thereon, an annularvgroove d is provided in the outer sur face df its reduced lowerportion into which projects screws e, extending through the reduced upper end of the support 13, preferably at diametrically opposite points thereof. 20

The notches d extend upwardly across the groove d so that the ends of the screws 6, which project into the groove 03 are in the ath of the trunnions c and serve as stops to limit the rotation of the tone arm.

In assembling the parts of which the above described form of my invention is composed, the lower end of the tone arm is placed within the upper end of thetubular support B, with the trunnions c resting upon the shoulder Z): The keeper ring D is then moved downwardly into engagement with the upper end of the support so that its lower edge rests upon the shoulder b and its recesses 03 surround the trunnions c.

The screws 6 are then screwed inwardly so that their inner ends project within the groove 0Z In Figs. 5 to 8 inclusive, I have illustrated a slightly modified form of my invention, in which A designates the supported end of the tone arm which rotatably fits within the upper end of the tubular support 13*, the latter being cut away so as to form the interior shouldenb upon which rests the trunnions 0 which are preferably formed by projecting the ends of a rod C through the large lower end a of the tone arm. D indicates a keeper ring cut away eXteriorly around its lower end so as to fit within the reduced upper end of the tubular support B -with its lower end resting upon the shoulder b and with its upper end overlying the upper end of the tubular support.

Projecting inwardly from diametrically opposite points on the upper edgeof the reduced top portion of the tubular support B are lugs e which are preferably formed integrally with the tubular support, as by bending inwardly portions of the metal of which the support is formed. An annular groove f is formed in the outer surfaceof the reduced lower portion of the keeper ring D at a height above its lower edge to register with the lugs 6 when the keeper ring is properly seated upon the tubular support. Diametrically opposed portions 7 of the reduced lower part of thekeeper ring D arecut away below the groove f so that'the distance between such cut away portions is slightly less than the distance between the inner ends of the opposed lugs e The parts composing the modified form of my invention shown in Figs. 5 to 8, may be conveniently assembled by first placing the lower end of the tone arm within the tubular support B with the trunnions 0 resting upon the shoulderb and then seating the keeper ring D upon the upper end of the support B, which may be done by locating the cut away portions f immediately above the lugs e and then moving the ring downwardly until its lower edge restsupon the shoulder 6 and with the notches d overlying the trunnions 0 The lugs 6 then register with the groove 7 so that the ring D may freely rotate relatively to the tubular support B and permit the requisite horizontal rotation of the lower end of the tone arm. In this form of my invention, as in the form shown in Figs. 1 to 4-inclusive, the tone arm is supported entirely by its trunnions resting upon the shoulder on the interior of the tubular support, the keeper ring merely serving to maintain the lower end of the tone arm in concentric position with relation to the surrounding support, and to pre vent the disengagement of the tone arm from its support.

From the foregoing description it will be observed that I have invented an improved support for the tone arm of a talking machine, by means of which the tone arm is supported to be freely movable horizontally and vertically with a minimum of resistance. It will be further observed that my invention comprises parts which may be readily assembled, or disassembled, to permit the convenient connection of the tone arm with its support, or its removal therefrom when occasion requires.

that I claim is:

1. In a talking machine the combination with a tone arm, of a fixed tubular support within which the supported end of the tone arm projects, trunnions projecting from diametrically opposite sides of the supsupport on which said trunnions, rest, a

keeper ring rotatably fitting within the upper end of said support and having notches at diametrically opposite points in its lower" edge surrounding said trunnions, and projections extending inwardly from said support above the shoulder thereon engaging a groove in the outer surface of said ring.

3. In a talking machine the combination with a tone arm, of a fixed tubular support, into which the supported end of the tone arm projects, trunnions projecting from diametrically opposite sides of the supported end of the tone arm, a shoulder within said with a tone arm, of a fixed tubular support.

into which the supported end of the tone arm projects, the upper end of said support being reduced in'diameter interiorly to form a shoulder, trunnions projecting from diametrically opposite sides of the supported end of the tone arm resting uponsaid shoulder, and a keeper ring rotatably fitting within the reduced upper end of said support and engaging the shoulder therein, said ring having notches at diametrically opposite points in its lower edge loosely surrounding said trunnions.

5. In a talking machine the combination with a tone arm, of a tubular support into which the supported end of the tone arm projects, trunnions projecting from diametrically opposite sides of the end of the tone arm, a shoulder within said support upon which said trunnions rest, a keeper ring rotatably fitting within the upper end of said support and having notches at diametrically opposite points in its lower edge loosely surrounding said trunnions, said keeper ring having a circular groove in its outer periphery intersected by said notches, and projections extending from said support into said groove to limit the rotation of the tone arm by intersecting the path of said trunnions. A

In testimony whereof, I have subscribed my name.

LOUIS K. SOOTFORD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. G.