US1675852A - Record stop - Google Patents

Description

July 3, 1928. 1,675,852

' E. s. GEER RECORD STOP Filed May 29, 1924 INVE TO W ATTORNEYS I Patented July-3, 192a.

' UNITED STATES EDMUND S. GEER, OF NEW YORK, N. Y.

RECORD STOP.

Application me ma as,

This invention relates to phonogra hs, and

more particularl to the stoppage honographs on the completion of a recor An object of this invention is to rovlde a new and improved phonograph, which will be automatically stopped when the playing record has been completed.

A further object is to provide a new and improved phonograph record which when used or. a phonograph will automatically cause the latter to discontinue playing when the end of the record has been reached.

The invention accordingly comprises the features of construction, combinations of elements, and arrangement of parts, which will be exemplified in the constructions hereinafter set forth and the scope of the application of which will be indicated in the claims.

Other objects of the invention will in part be obvious and will in part appear hereinafter.

For a fuller understanding of the nature and objects of the invention, reference .5 should be had to the following detailed description taken in connection with the accompanying drawin in which:

Figure 1 1s a top p an of a device embodying this invention;

Fig. 2 is a vertical section;

Fig. 3 is a section similar to Fig. 2 but of a slightly modified form of construction; Figs. 4, 5 and 6 are fragmentary enlarged views showing various positions of a phonograph needle on a record in accordance with this invention;

Figs. 7 and 8 are details of modified forms of the slot;

Figs. 9, 10 and 11 are views similar to Figs. 1, 4 and 5 respectively but of a modified form of construction.

The numerals 1 and 2 designate respectively the tone arm and turn table of a phonograph, and the numeral 3 designates a record which may be of the disc type. The disc 3 is rovided with the usual sound grooves deslgnated generally by the numeral 4, with which a needle 5 on the tone arm is adapted to co-operate to reproduce the sound.

In accordance with this invention, means are provided upon the record for co-operating to bring the record to a stop when the pla ing thereof has been completed.

Since the tone'arm itself moves over the record as it is played, a practical manner of 1924. Serial No. 716,548.

accomplishing this result is to cause the said means to co-operate with an element on the tone arm to cause the stop age: Thus the record itself may be so designed or equipped as to grip the needle to cause such increased resistance or such locking action necessary to brin the record to rest. Thereafter the turn ta le itself, if it has not al-.

ready stopped, will he brought to rest by the friction between itself and the record.

The last turn of the sound groove 6 leads I into a groove 7 (see Fig. 1) which may. if desired, be deeper than the sound groove in order to restrain the needle more securel from 'umping to the side. This groove leads irectly to the means for stopping the record.

As illustrated, an opening 8 is provided in the record into which the groove 7 leads and this opening terminates in the narrower slot 9, and the opening 8 and slot 9 are so arranged that when the point of the needle 5 has passed beyond the end of the groove 7, it will fall into the opening 8 and immediately, as the record is rotated, pass into the slot 9. This slot will be of such size and shape as firmly to grip the needle to bring the record to rest.

In practice, it is preferred ,to rovide a plurality of orifices 8 and 9 equal y spaced around the record so that, if for an reason the needle should traverse the first s ot without checking the movement of the record, it may thereupon fall into the second slot and be there gripped.

The operation of this form will thus be evident. The needle traverses the sound groove until the record portion thereof is completed. It thereupon passes as shown at 6 into the groove 7 as illustrated in Fig. 6. When the needle passes the front edge of the opening 8, it immediately falls and encounters the edges of the slot 9. It may, in fact, if the slot is so designed, strike the front edges so as to become immediately wedged in the slot with suflicient force to stop the record. Otherwise, it will move through the slot imposing a drag upon the record by reason of the friction between the needle and the slot, until the record is brought to rest.

In certain instances, it may be desirable to embody special friction material at the edges of the slot to assist in bringing the record to a stop, but satisfactory results have been dobtained with the forms of slots illustrate In Figs. 7 and 8, there is illustrated modified constructions of the slot which may be used to bring the record to rest. In the form of Fig. 7, the slot is made sinuous, whereby it presents varying angles to the needle. In the form illustrated in Fig. 8, the width of the slot is varied at intervals to rovide a wedgin action on the needle.

Ks the record an turn table rotate, they possess considerable momentum andthus in order to bring the record quietly and quickly to rest and through it to stop the mechanism of the honograph, it is in many instances desirab e that the friction between the record and the turn table be so adjusted that the needle may first bring the record to a stop allowing it to slide upon the turn table, and the turn table this subsequently be brought to rest by the drag thus imposed upon it.

For these reasons and a so in order that the friction between the record and the turn table may be subseqnently independent of whether the record has been slightly war ed or not, it has been found desirable to al ow the record to rest upon a smaller surface at a predetermined distance from the, center, whereby a definite amount of frictional drag may be assured.

In the form illustrated in Fi 2, this may be accomplished by placing a 150 of felt 10 beneath the central portion of the record. Where this is done in view of the fact that at the slot the needle may in many instances pass completely throu h the record, it is desirable that this felt isc shall be of diameter smaller than the diameter of the circle on which the slot 9 is laced. Should such a circle prove too smal to afford sufiicient friction to brin the turn table to rest, the

surface of the disc may be especiall roughened as shown at 11 to increase an localize the friction, and this rou hened surface is preferabl raised above t e main playing surface 0 the disc as shown, in order to provide space beneath the disc at the point where the needle may extend completely through the opening 8.

In the form of the device illustrated in Fig. 3, an annulus 10 of felt is provided, whose inner diameter is sufliciently reat to give the necessary friction to stop t e turn table without especially roughening the surface.

In the form illustrated in Figs. 9, 10 and a 11, the slot is tapereg}i increasing in width from the top towa the bottom and the fore desirable t at the friction between the record and the turn table be such as to perm1t the turn table to be brought slowly to rest. For this reason, this form of the invention is illustrated with the roughenedsurface 11 ms described for the prior form. Since certaln changes may be made in the I above construction and different embodiments of the invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the acompanying drawing shall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the following claims are intended to cover all of the eneric and s ecific features of the invention ierein descri ed, and all statements of the scope of the invention which, as a matter of laliguage, might be said to fall therebetween. avlng described my invention what I claim as new and desire to secure byLetters Patent, is

1. A device of the characterv described, comprising a phonograph record adapted to be used with a tone arm carrying a needle, said record having a slot therein associated with the end of the sound groove of sufiicient de th and width to engage the parallel sides 0 the needle to lock the record in place.

2. A device of the character described,

EDMUND s. GEER.

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