US1425486A - Phonograph record - Google Patents

Description

T. D. JONES AND J. H. BARR.

M. BARR, EXECUIHIX'OF i. H= BARR, DEC'D. PHONOGRAPH RECORD.

1 APPLICATION FILED FEB. 7. 1921. Patented Aug. 8 1922.

THOMAS DOUGLAS JONES AND JOHN H. BARR, OF KANSAS CITY, MISSOURI; MARY BARR EXECUTRIX OF SAID JOHN H. BARR, DECEASED.

PHONOGR APH RECORD.

Specification of Letters Patent.

Patented Aug. 8, 1922.

Application filed February 7, 1921. Serial No. 443,002..

To all whom 1'1 may concern:

Be it known that we, THOMAS DOUGLAS JoXEs and JOHN H. BARR, citizens of the l'nited States. and residents of Kansas City, county of Jackson. State of Missouri, have invented a. certain new and useful Improve ment in lhonograph Records, of which the following is a complete specification.

This invention relates to phonograph disk records and has for its object to produce a record provided within the space surrounded by the sound reproducing grooves, with a score or groove to receive the needle after the sound reproduction has been accomplished, and guide the needle inward and then outward with respect to the axis of the record. and thereby eventually reveise the travel imparted to the tone arm by the engagement of the needle with the sound reproducing grooves of the record, this reverse or outward travel of the tone arm being utilized to efiect the operation of the brake mechanism to arrest the rotation of the record. The mechanism in contemplation for actuation by the outward movement of the tone arm. will form the subject matter of another application for patent, and hence is not illustrated or described herein.

Vith this object in view the invention consists in the provision in the. face of the record. of a scoring or groove intersecting at its outermost point. one of the non-reproducing grooves or the trem'ity of the final sound reproducing groove of the record, and extending first inward and then outward ,toward but not be- 'ond the said non-reproducing or innermost extremity of the final sound-reproducing groove. as hereinafter described and claimed andin order that it may be understood reference is to bechad .to the accompanying drawing, in which v Figure 1, is a face view of a phonograph record embodying the preferred form of the invention.

Figure 2, is a similar but fragmental view of a record of modified construction.

Referring now to the drawing in detail, the record 1 of the usual type and operation,

is provided in Figure 1, with a circular scoring or groove 2 disposed eccentrically to the axis 3 of the record and at its point most remote from such axis, intersecting one of the usual non-reproducing grooves 4 innermost exsurrounded by the sound re-producing grooves 5 of the disk.

'ith this construction the said eccentric scoring or groove may intersect the inner extremity of the spiral, reproducing groove if the record lacks the customary additional inner grooves for guiding the needle without an attendant sound reproduction.

In I*igure 2, the scoring 6, intersects either of the grooves mentioned as conventional in disk records, and curves inward from the .point of intersection to avoid a too sudden or abrupt inward jump or acceleration of the nward movement of the needle and tone arm. the scoring then ext-ending as a chord or partial cord 7 of the innermost of the customary grooves. so that it shall at first continue the inward travel of the needle and then reverse such travel, accomplishing the result in the same manner as the eccentric groove 2 but more rapidly, as it efiects the reverse or outward movement of the tone arm in less than a half revolution of the record as contrasted with the eccentric circular groove which starts the outward swing of the tone arm at theend of a half revolution of the record. \Vith the chord type of groove it is preferred that it shall intersect the innermost sound-reproducing groove or one of the non-reproducing grooves at both ends. though it may intersect at one end only, this being immaterial provided the brake actuating mechanism of the phonograph functionsproperly. -It is also desirable that the scoring of either type or of any modification thereof, shall beslightly deeper than the sound-reproducing and nonreproducing grooves, to insure the necessary reverse travel or swing of the tone arm. The

same principle of construction can be applied in connection with the cylinder type of record.

From the above description it will be apparent We have produced a phonograph record capable of imparting outward or reverse movement to the tone arm, and it is 1 susceptible of modification in minor articulars without departing from the principle of construction involved.

We claim: I 1. A phonograph disk record provided on its face within the space surrounded by the sound reproducing grooves, with a scoring or groove for receiving thev needle of the tone arm after the needle has completed its inward travel in said rooves, to cause said needle to move inward and then ouhvardly and impart correspondlng movements to the tone arm. 1

2. A phonograph disk record provided within the space surrounded by the sound reproducing grooves, with a circular scoring or groove disposed eccentrically of the axis of the record and at its point most remote 10 from said axis, intersecting the normal path of travel of the needleto cause the same and the tone arm to move inwardly within the space and then outwardly.

TOM DOUGLAS JONES. JOHN H. BAR-R.

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