US1375750A - Stylus-bar attachment for phonographs - Google Patents

Description

A. F. GILLET.

STYLUS BAR ATTACHMENT FOR PHONOGRAPHS.

APPLICATION FILED JULY 14, 1920.

1,375,750. Pafent d Apr. 26, 1921.

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UNITED STATES PATENT OFFICE.

ALEXIS F. GILLE'I', OF OMAHA, NEBRASKA, ASSIGNORTO JUBILEE MANUFACTURING COMPANY, OF OMAHA, NEBRASKA, A CORPORATION.

Specification of Letters Patent.

Patented Apr. 26, 1921.

Application filed July 14, 1920. Serial No. 396,263.

T 0 all whom it may concern Be it known that I, ALExIs F. GILLET, a citizen of the United States, residing at Omaha, in the county of Douglas and State of Nebraska, have invented certain new and useful Improvements in Stylus-Bar Attachments for Bhonographs, of which the following is a specification.

This invention relates to an improved mounting for the stylus upon the stylus bar of a phonograph to eliminate the harsh tones usually caused by undue vibration of the stylus while engaging in the spiral groove of a disk record, and to soften or modify the tone usually produced by the metallic parts which engage the diaphragm of the sound box. One of the specific objects of the invention is to provide an at tachment for the stylus bar for the purposes mentioned which will be so constructed that it will not prevent the stylus from being disposed in alinement with the stylus bar. Another specific object is to provide a sleeve or cylindrical filler of shock-absorbing material which will uniformly modify the vibrations, said sleeve to have such a mounting that it will effectively prevent a contact of any of the metallic, supporting parts of the stylus with the stylus-bar.

The invention consists of the novel construction, combination and arrangement of parts as described herein and claimed, and as illustrated in the accompanying drawing, wherein,

Figure 1 is a plan view of the sound box, the stylus bar and the attachment thereon. Fig. 2 is a side view of the same, a part of a disk record being added. Fig. 3 is a side view of the attachment. Fig. 4 is a front end View of the parts shown in Fig. 3. Fig. 5 is a view in longitudinal section showing the metallic, cylindrical casing, the metallic cylindrical core, the stylus and the sleeve or filler for absorbing vibration. Fig. 6 is a rear end view of the attachment.

The invention is described in connection with the sound box 7 and stylus bar 8 con-- nected with the diaphragm 9 of a phonograph, and in order that vibrations may be modified which are communicated to the diaphragm from the stylus bar and occasioned by engagement of .the stylus 10 with the disk record 11, I provide the attachment 12 for the stylus bar for holding the stylus.

The attachment consists of a filler-block 13 of vibration absorbing material, a cork sleeve a surrounded by a sleeve 6 of india rubber being shown in the present instance, but other non-metallic substance or substances may be substituted if desired, a metallic, cylindrical casing 14 being employed as a holder for the filler-block 13, the curved sides as of the casing terminating adjacent to each other at its top, and its lower side being provided with an angular shank 15 having a terminal 0 disposed in line with the longitudinal axis of the cylindrical filler 13 for a mounting in the aperture (not shown) of the stylus bar.

Numeral 16 indicates a cylindrical, metal- 110 core, provided centrally with a recess for holding the stylus 10 and adapted to fill the aperture of the sleeve a, and it will be seen that the stylus when mounted in its holder will be disposed in line with the terminal 0 of the shank of the casing 14.

The sleeve Z2 is preferably provided with .a ridge 9 adapted to be disposed between and to engage the ends of the curved sides 00, which prevents any revoluble movement of the cylindrical block 13 relative to the cylindrical casing 14, and by means of a setscrew 17 which traverses the sleeves a and b and ridge 6 and which is threaded in the metallic core 16, the stylus may be socured stationary with the recessed core, or may be released therefrom.

The convexed surface of the sleeve b is provided with corrugations as indicated at 18, and since only the-ridges of the corrugations will make contact with the metallic holder or casing 14, this feature operates to modify the vibrations communicated to the stylus bar from the stylus; and in operation, since the sleeves a and I) provide a medium for the communication of vibration from the stylus to the stylus bar, all harsh sounds caused by excessive vibration and generally occasioned by imperfect styli or imperfections in the grooves of disk records will be practically eliminated.

It is considered that one feature of advantage which will be appreciated in the use of the herein described attachment is the fact that the stylus will bemaintained in line with the axes of the stylus and stylus bar. It will be noted that the parts employed are of such simple construction that they may be conveniently produced and may be readily assembled; also that the provision of the ridge 6 for the sleeve 6 will prevent contact of the set-screw with the metallic casing, which otherwise might accidentally occur.

While I have shown two resilient sleeves a and b of vibration-absorbing material and prefer this construction, this feature is not necessary to operation, and I may use a single sleeve; also I may change details of construction and size, form and proportion of parts, such changes to be within the sco e of the invention as claimed.

claim:

1. In a stylus bar attachment for phonographs, a metallic, c lindrical casing open at one side and provi ed opposite to its open side with an angular shank for engaging the stylus bar, a metallic core centrally of said casing, a stylus in line with the axis and carried by said core, a sleeve of vibrationabsorbing material between the metallic core and casing, and a set-screw between the sides of the casing traversing the sleeve and metallic core for engaging the stylus, said angular shank having a terminal adapted to be disposed in line with the stylus and stylus bar.

2. In a stylus bar attachment for phonographs, a metallic casing open at its ends, a recessed, metallic core in the casing, a stylus in the recess of the core, a sound-absorbing body in the casing encircling the core, said body having numerous ridges for engaging the casing and having numerous grooves to lie adjacent to the casing, said casing being provided with a shank having a terminal disposed in line with the stylus and adapted to be mounted upon the stylus bar in line with the axis of said bar.

3. In a stylus bar attachment for phonographs, a metallic, cylindrical casing open at one side and provided opposite to its open side with an angular shank, a recessed, metallic core centrally of said casing, a stylus in the recess in line with the axis of said core, a sleeve of sound absorbing material outwardly of said core having ridges engaging the casing, and a metallic keeper between the sides of the casing traversing the sleeve and metallic core for engaging the stylus, said angular shank having a terminal adapt ed to be mounted upon the stylus bar in alinement with said stylus and stylus bar.

4. In a stylus bar attachment for phonographs, a cylindrical sleeve of sound absorbing material provided longitudinally with a ridge and having a metallic, recessed core disposed longitudinally thereof at its middle for holding a stylus, a casing having curved sides adapted to enga e the periphery and abut upon the ridge of? said sleeve, a keeper engaging in said sleeve and ridge and threaded in the core for a contacting rela tion with the stylus, said casing having a part disposed in alinement with the recess of the core for an alining position with the stylus bar when mounted on said bar.

5. In a stylus bar attachment for phonographs, a recessed, cylindrical, metallic core for holding a stylus, a sound absorbing sleeve encircling the core and provided longitudinally with numerous ridges, a casing mounted non-revolubly upon and having curved sides adapted to engage the ridges of the sleeve and having a part disposed in alinement with the recess of the core for an alining. position with the stylus bar when mounted on said bar.

In testimony whereof, I have afiixed my signature in presence of two witnesses.

ALEXIS F. GILLET. lVitnesses:

ARTHUR H. STURGES, HIRAM A. STURGES.

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