US1755743A - Phonograph disk record - Google Patents

Description

April 22, 1930.

E. H. MORRISON PHONOGRAPH DISK RECORD.

Filed Nov. 2, 1928 INVEN TOR.

A TTORNE Y.

iPatented Apr. 22,1930

V UNITED STATES PATENT OFFICE EDGAR H. MORRISON, OF VIRGINIA BEL rrronoeaarrr msx niioonn Application filed November 2, 1928. Serial No. 816,807.

l graph spindle and the edges of this opening are comparatively soft, being formed in the disk itself, the material of which is not hard enough to withstand wear or rough handling. As, however, in general usage this opening only serves for centering the disk on the revolving table, which communicates the motion to the disk through the soft padded top, the said edges are not exposed to a great deal of wear except in the placing or receiving of a record disk on the table. When, however the records are repeated over and over again on automatic replacing machines, the strain is very great and as a consequence the opening will soon be enlarged or still worse, worn more on one side than on' the other. Sometimes actual pockets are formed to one side of the opening so that it is impossible to properly center the disk again, but more serious still is thefact that the disks do not properly set or aline on the supporting arm of the machine and as a consequence of this the machine fails to function.

It is therefore the object of my invention to eliminate these disadvantages and to supply record disks with centers that will stand considerable hard usage. For this purpose I supply a hard, flanged hub or center of any suitable material, such as steel, brass, or the like, and form the disk around the same during manufacture. In this manner I provide a disk center that will last the record out without any appreciable change in the size of the central opening.

For restoring records in which the central opening has already been distorted, I propose to use hubs with star-shaped ends. In that case the openin in the diskis restored to circularby insert-mg a temporary centering piece of the type shown in Figure 6. This device is a cylindrical piece of metal having therein and having smooth \or undulated edges, which are then spun, flared, or bent outwardly to grip tightly the two faces of the disk The restored -record may then be used again for a long time until the sound-producing grooves have been worn out. v

I am aware that clips have; been use'dlfor recoril disks both around the periphery and in the center thereof, but they are furnished solely for the purpose of securing two single a record disks together -so as to make a reversible unit thereof. They are moreover all placed in position after the records are finisfhed and not during the manufacture there- My invention is illustrated in the accompanying drawing in which-- Figure 1 is a face view of a. record disk provided with a hub or bushing forming the subject matter of the present invention;

Figure 2 a diametrical section of Figure 1;

Figure 3 shows a face view of an ordinary record disk with a worm and distorted central opening: v

Figure 4 a'similar view showing the disk in Figure 3 bushed and its opening restored to normal size;

Iiigure 5 a diametrical section of Figure 4:, an

Flgure 6 is a perspective view in larger scale of a reinforcing hub ready for insertion in the disk.

In Figures 1 and 2 an ordinary record disk is represented by reference numeral 10. It is provided with a central opening 12 somewhat largerthan the opening in a disk of the usual kind. 0 This opening is filled by a metallic sleeve or bushing 11 fitting tightly a flange 13. at each end sunk into the body of the disk 10 so that the exposed sides of the flanges becomei flus h with the side surfaces of the disk. It-w'ill -be evident that with a bushing flanged in this manner, it would be impractical to, insert it 1 after the record is otherwise finished. I

therefore propose to first supply the hub or bushing 11 having the flanges 13 extending radially from the ends thereof; then formin the disk around it so that it becomes embedded in the body of the disk during the process of manufacture when the disk is formed around the hub. A truevcenter is thus provided for the disk with an opening 14'of the exact diameter to fit the table spindle of the phonograph. In case the latter now should be an automatic replacement machine the hooked finger on the lifting arm cannot possibly destro the roundness of the central opening 14 an the usefulness of the record is thus prolonged considerably.

In the case of old records that have been already worn so as to have an enlarged, eccentric, central opening 15, as seen in Figure 3 I propose to use a bushing .16 (see Figure 6 with undulated end edges 17. In such cases the temporary piece 16 is simply inserted by hand and the prongs 17 bent outwardly against the surface of the disk on both sides,- thus giving the ap earance of. a many-pointed star with the which is of the same diameter as the spindle on the revolving table of-the machine. This construction is shown in Figures 4 and 5 where the fingers are indicated as lying fiat onthe side surfaces 18 of the disk and the annular portion of 'the bushing fits againstthe inner periphery 19' thereof. It is, however, evident that a counter-bore, may be provided on each side as indicated in Figure 2 in which case the star fingers also here goald be flush with the side surfaces of the s Y Instead of using a star-shaped hub or bushing, the flanges may have any other coning adapted to be inserted in the center open- I ing of the disk record for cooperation with a center spindle comprising a cylindrical body portion having an internal diameter substantially the size of the center spindle, said'body being provided with prongs at each end adapted to be bent at right angles to. the axis of the cylindrical body into intimate contact with the opposite side faces of a disk record.

2. In a phonograph record, a circular disk and a hub for said disk forming an insepaagainst the side surfaces 0 rable unit therewith, the interior diameter of the hub corresponding to that of the phonograph spindle, and said hub provided with, radially projecting rongs lying flat f the disk.

In witness whereof, I have hereunto set my hand at Vir 'nia Beach, Virginia, this 15th day of Octo er, A. D. nineteen hundred and twenty-eight.

- EDGAR H. MORRISON.

gers spread out radially from the center opening 14

Images