US1453637A - Phonograph stylus - Google Patents

Description

May 1, 1923.

Y 1,453,637 "r. PARSONS PHONOGRAPH S TYLUS Filed April 5, 1920 l 'atented may 1,1923.

THEOPHILUS PARSONS, F CAIdIP DODGE,

rrrouoenarn STYLUS.

Application filed. April 3, 1920. Serial No. 370,942;

To. all whom it may concern:

Be it known that I, THEOPHILUS PARSONS, a citizen of the United States, :Camp Dodge, in the county of Polk and State of Iowa, have invented a new and useful Phonograph Stylus, of which the followingis a specification.

This invention relates to a phonograph, and more particularly to improvements in the sound reproducing elements thereof.

It is one object of my invention to avoid some well-known objections to-the usual construction by providing a freely rotatable record engaging disc, preferably having a I thin edge adapted to be recelved in'the usual This disc construction posrecord grooves. sesses numerous advantages over. the needles commonly used, which advantages will be fully indicated hereinafter.

vide an improved sound box and amplifier construction, by means of which the volume of sound is increased and the quality of tone is also improved.

My invention further relates to arrangements and combinations of parts which will be hereinafter described and more particularly pointed out in the appended claims.

A preferred form of my invention I is shown in the drawings, in which I Fig. 1 is a side elevation of a portion of a phonograph embodying my invention;

Fig. 2 is a. front elevation of the sound box and record engaging disc;

Fig. 3 is an enlarged side disc; and

Fig. 4: is a longitudinal sectional elevation thereof, together with the support in which it is mounted. 1

Referring to the drawings, I have shown a portion of a phonograph including a horn or other sound amplifier and distributor 12. connected through a universal joint 14 and a connection 15, to 45 which a diaphragm 18 is mounted.

A diaphragm lever 19 of the usual type is mounted on pivots 20 on the sound box 16 and has its inner end secured to the diaphragm in the usual way.

W The outer end ofthe elevation of the residing at v in the opposite Another object of my invention is to pro-' a sound box 16, withindiaphragm lever 19 is provided with a socket 21, adapted to re i ceive a pin or stud 22 extending upwardly I and rearwardly from a preferably U-shaped support 23. Pivot screws 2 1 and 25, threaded ends of the support 23, provide adjustable bearings for a freely rotate able record engaging disc 26. is preferably formed of some hard material, such as steel or fibre andis also preferably provided with a concave face on one side an a substantially convex face on'the opposite side. The discalso has a thin or knife-like edge which enables it to enter and'ffollowthe reCOId grooves in a phonograph-disc or cylinder.

l The stud 22 may be fast in the support 23 or may be loosely secured therein,-per- The disc 26 if r mitting the supportto move angularly about I the stud as an axis. It will benoted 1s not positioned in that the pin or stud 22 the plane of the edge of the disc 26 but that it is placedsubstantially l to one side thereof. With-this construction, the pivotal axis of the diaphragm lever-19 is also necessarilyat one side of the plane of the disc. This position of the discrelative to the axis of the lever is important,as the offset position enables me touse the'same reproducing mechanism with records in which the sound vibrations are recorded either horizontally as in the Victor type of record, or vertically as in the Edison type of record. I By substituting a freely, rotatable disc in place of the usual needle, I greatly prolong the life of the records, as the disc rolls freely along th record groove instead of being dragged over the surface thereof. Having thus described my invention, it' will be evident that changes and modifications can be made therein by those skilled-in,

the art within the spirit and'scope thereof as set forth in the claims, and I do not wish to be otherwise limited to the details herein disclosed, but what I claim is V 1. Ina phonograph, element comprising a 1 i a record-engaging freely rotatable disc concave on one-face and having a relatively thin sharp edge. I v 2. In a phonograph, a record-engaging element comprising a freely rotatable disc ing a relatively thin, sharp edge and having formed of hard material, said disc having portions of one face only projecting beyond a relatively thin sharp edge and being conthe plane of the edge and adjacent thereto. 10 cave on one face only adjacent the edge por- In testimony whereof I have hereunto 5 tion. 'affi'xed my signature.

3. In a phonograph, a record-engaging element comprising a freely rotatable disc hav- THEOPHILUS PARSON

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