US2295938A

US2295938A - Method of making phonograph disks

Info

Publication number: US2295938A
Application number: US436026A
Authority: US
Inventors: Raymond S Dech
Original assignee: AUDIO Manufacturing CORP
Current assignee: AUDIO MANUFACTURING CORP
Priority date: 1941-06-24
Filing date: 1942-03-24
Publication date: 1942-09-15
Anticipated expiration: 1959-09-15

Description

P 1942- R. s., DEbl-l 2,295,938

. METHOD OFMAKING PHONOGRAPH DISK'S Original Filed June 24, 1941 I 2 Sheets-Shget l Sept. 15, 1942. RS. DECH METHOD OF MAKING PHONOGRAPH DISKS Original Filed June 24, 1941 2 Sheet s-Sheet 2 another modification;

Patented 15, 1942 2,295,938 7 i N METHOD or MAKING PHONOGRAPH msxs Raymond S. Dech, Stamford, Coma, assignor to The Audio Manufacturing Corp Glenbrook, Conm, a corporation of Connecticut 1 Original application June 24, 1941, Serial No. 399,501, now Patent No. 2,283,797, dated May Divided and this application March 24, 1942, Serial No. 436,026

10 Claims.

This invention relates to new and useful im provements inmeth'ods of making phonograph disks and has particular relation to an improved method of making sound record blanks.

The objects and advantages of the invention will be apparent from a consideration of the fol: lowing detailed description taken 'ln connection withthe accompanying drawings. However, it

is to be understood that the invention is not limited to the details disclosed butincludes all such :variations and modifications as fall within thev spirit of the invention andthe scope of the ap' I pended claims. 4

The present applicati 15a divisibn of y ap plication Serial Number 399,501, filed June 24, 1941, now Patent Number 2,283,797 of 1942.

In the drawings: v t Fig. 1 is a face view of a phonograph disk made in accordance with the methodof the invention; Fig. '2 is an enlarged detail sectional view taken along the plane of the line 2-2 of Fig. 1:

Fig. 3 is a face view of a portion of a phonograph disk, with part of a coating broken away,

showing a modified construction of insert;

Fig. 4 is a view similar to Fig. 3 but showing Fig. 5 is a face view of a modified construction -of insert or plug and on a larger scale-than in Fig. 1; Fig. 6 is a face view of a portion of a phonograph disk comprising an outer member and an sert and suggesting a modified method of makti'sa viewsimilar to Fig. 5 but another modification;

Fig. 8 is a detail view showing a portion of a phonograph disk at one step .in the improved process of manufacture; and

Fig. 9 is a somewhat similar view but showing the disk following another stepin its production.

showing May 19,

terial of a different nature, 1. e. a softer material such that an opening may be punched therein without likelihood of fracture of the material about such opening during or following the punching operation. Insert M has a phonograph disk locating opening 15 therethrough.

In making my phonograph disk a base I! of the desired diameter and thickness is provided in disk form. Thereafter the relatively large diameter opening I3 is cut or drilled in the base since (the base being of glass or other rigid brittie substance) the opening cannot be formed by punching without breaking or fracturing the base Following the forming of opening I! one of the inserts I [is located in such opening. Preferably the insert is of fibre board, cardboard, metal,

or other material of a nature to permit of the punching of a hole or holes through it without danger of fracture of the material.

.Insert 14 may itself be punched from a sheet of stock. and thereafter or as part of the punching operation the insert is provided withslitsli "spaced apart and entering the insert from the outer peripheral edge-thereof. These slitsare relatively narrow and lend some resiliency to the inserts whereby if the openings '13 vary slightly Referring in detail to the drawings a disk made according-to the methodofthe invention is shown in Figs. 1 and 2 and steps in the method of making said disk being illustrated in Figs. 8

and 9. The complete disk is generally designated l0 and comprises a diskshaped basev or mem- 'ber ilhaving on either or both sides a coating H of lacquer or: other material adapted to have" a sound groove engraved orcuttherein or having sound grooves therein. Base H has a rather large: diameter opening I! therethroug h-and a plate-like insert I4 is secured in said opening. I

Base or memberllis of a frangible orfra'ctu're 1 ,able materiaLas glass, and insert I4 is of atrian in size,;are not exactly circular,v or. have rough edges, or the like, the inserts may be sprung into place in the openings and will adjust themselves to the sizes-of the openings into whichthey are sprung.

. After the insert'is in the opening 13, where it is retained by engagement with the edges of the opening, the coating Ii is applied. This coating is usually appliedfirst to.one side and .then to the other of the disk. The coating is continuous over each side of the base 12 and the insert M. This leaves the insert securely enclosed by a film on each of its sides and some other coating materialmay enter between the, contiguous edges of the insert andopening, as at- I], ,to further secure the insertin place. Spacefor the coating at I! may result from deforming of the-insert,

from the latter having a broken or interrupted edgeorfrom the fact that the edge of the opening. l3-is generally rough. Further the coating material entersthe slits l6 filling the same and establishing an interlocking connection betweenthe insert and the coating.

- Fig. 8 shows the insert in place in the opening 1 [3 of the base priorto. the coating of the illustratedside' of the disk. Fig. 9 shows the next step inthe making of the improved phonograph disk and in such figure the coating H ha's'been applied to the illustrated side of the base and insert. When the coating has been applied to both sides of the disk the next and final step is In such operation the outer edges of may be punched in the desired predetermined relation to the outer edge of the disk and usually exactly centrally of the disk.

Locating opening I is preferably punched after the coatings have set and therefore when the opening has been made the disk is completed and ready for use. If this opening I5 is made at any time prior to the setting of the coatings the latter are likely to run into the opening so that the latter would then have to be reamed out or otherwise again treated to make the disk ready for use. Further since opening [5 is made by punching its dimensions may be very accurately controlled.

Owing to its flatness, its smoothness and its rigidity glass is preferred for the making of the base [2. However, other materials may be used. The use of glass or other fracturable or frangible materials presents some problems that heretofore have restricted their use in making phonograph disks. Among the difliculties not heretofore overcome was the making of a satisfactory and serviceable locating or mounting opening, as the turntable spindle receiving opening, in the disk. This problem I have overcome.

Base or member l2 may be of any diameter, as, for example, 8, 10, 12, 16, etc., inch phonograph disks and is usually approximately one sixteenth of an inch in thickness. Opening I3 is of the desired diameterand the inserts B4 are preferably of a diameter to have a snug fit in such openings. Slits l6 are'in the neighborhood of .005 of an inch in width although this may depend on the diameter, thickness and material of the insert. These slits extend into the insert a distance to have the latter somewhat resilient whereby they may be sprung into openings of slightly smaller diameter or having rough edges or that are not exactly round. With the described structure the inserts will retain themselves in place during the coating operations.

Regardless of the outside diameter'of the base [2 it is preferred to have the opening 13 of one diameter in all basesso that inserts l4 of but one diameter need be made up and kept on hand for all diameters of phonograph disks. These inserts M are located within the sound groove area of the disk it being understood that the sound grooves in a record will be between the outer periphery of the base l2 and the insert I4.

It is here noted thatjhe base I2 is of a nonpunchable or fracturable material while the ininsert l4. The insert is inwardly of the sound groove area of the disk and is provided with slits 24 for the purpose of the slits l6 of Figs. 1 and 2. A sound .groove receiving coating 25 is applied to each side of base 2| and insert 23 and seals the latter in place.

From the above it will be understood that insert 23 is much like insert l4 and the difference resides in the fact that insert 23 in addition to the central locating opening 26 is provided with three other locating openings 21. openings are formed by punching and usually as the final step in the making of the disk. One ormore of the openings 21 is to be used in connection with an eccentric driving pin on the turntable of a phonograph.

To accommodate the additional openings 21 the insert 23 may be of greater diameter than insert l4 although the diameter of the elements is a matter of choice or convenience. Any desired number of locations of the extra openings 21 may be provided and the disk may be used with a turntable not provided with a driving pin or driving pins if that is desired.

In the modification of Fig. 4 the disk 30 comprises a base 3| of glass or the like. This base has a plurality of relatively large diameter-

openings

32, 33, and 34 drilled therethrough and each receiving an insert 35 similar to the insert l4 first described. Inserts 35 have the slits 36 and locating openings 38 corresponding with the slits l6 and locating opening l5 of insert l4. Continuous coatings 31 of lacquer or other sound groove receiving material are applied to each side of base 3| and the inserts 35 and fill the slits 36 and seal the inserts in place. The final step in the making of disk 30 is the punching of the locating openings 38 inthe inserts 35.

All of the inserts 35 are located within the .sound groove area of the disk 30 and the inserts may be in the, desired positions relative to one another. For example, one insert may be so disposed that its opening 38 will be punched concentric with the outer periphery of disk 30 while the other inserts have their openings located for cooperation with eccentric driving pins on a turntable.

The insert 40 of Fig. 5 may be used in place of any of the inserts previously described and comprises a body 4| made of fibre board, cardboard, metal or the like punchable material and has its edge roughened as by being milled or serrated at 42. Insert 40 having an uneven or broken edge may be forced into an opening slightly smaller than the greatest diameter of the insert and will frictionally retain itself in place 'during the coating operation. Portions of the lacquer coating material wiil'fiow into the milled slots or serrations locking the insert to the coating. Thus insert 40 maybe substituted for any of those previously described and may have one or more locating openings punched therein as the final step in the making of a disk.

Fig. 6 suggests a modified process or method of making a phonograph disk. There the disk, generally designated 45, includes a base 46 of glass or other fracturable material in which is cut or drilled a relatively large diameter opening 41. An insert 48 is provided to have a loose fit in opening 41 and is of the material previously described for use 'in making inserts.

Insert 43 being solid without slits or a rough or broken edge hasno resiliency. Since it is purposely made small it has a loose fit in the opening 41. In making disk 45 insert 48 is adhesively held in place and the sides of the base,

All of these ventlongpwhat I claim is:

tape may be left in place or removed from base and insertandthe second side of the disk coated. In the coating operation some of the coating material flows into the slight space heand eifectively seals theinsert in place. after a locating opening or openings is punched in the insert.

Fig. 7 shows another modification'of insert Thereor are 2,295,9sa the tween the insert and the edge of the opening 41 reception of a sound groove and the latter is sealed to the former, and then punching a generally designated 50 and adapted to be subi0 stituted for any of the inserts previously described when making a phonograph disk. In-

sert 50 is a disk relieved along a portion of its edge whereby it. is not a true circle but has a slightly greater diameter along the line AB 5 than along the line CD. That is, over a considerable are as suggested by the distance between the dotted line 5| and the full line 52, the disk is relieved.

cating opening in said insert.

3. The method of making a phonograph disk comprising drilling an opening in a body member of fracturable material, placing an insert of nonfracturable material in said opening in frictional engagement with the edges thereof, and then sealin'g said insert in place with a film of sound groove receiving material extending onto both For example, where thedisk has a diameter 3 along the line A-B of .750 inch it has been found satisfactory to reduce it over an arc of approximately 120 degrees to have its diameter along the line C-D approximately .740 inch.

These dimensions are only suggested and are not to be considered as limiting.

A slit 53 is formed in the disk and extends in the direction of the short diameter thereof entering from one edge and preferably extending 6- more than one-half the distance'across the in- V sert. Owing to the presence and location of 3 this slit 53 the insert may have its diameter along the line A-B reduced by squeezing its portions inwardly reducing the width of the slit 'or even closing the'open end portion thereof.

Thus it will be understood that insert 50 may be inserted into an opening which isnot truly circular or which is of a diameter less than that of the insert when measured along the line 4 A-B and that the disk will expand and hold itself in place in an opening into which it has. beenplaced. The insert 50 has certain manufacturing advantages over the insert l4 but other-- the member. I i

6. The method of making a phonograph disk comprising forming an opening in a body memwise itmay be substituted for-any of the inserts 45 heretofore described.

It is to be understood that in the foregoing description and in the appended claims the words phonograph disk are used to designate either a form of a disk. Additionally it is pointed out that the inserts preferably are of a thickness to lie within the planes represented by the side surfaces ofthe base so that a series of the completed disks may be stacked one on the other i and lie fiat so that they may be handled without breakage should they be tightly gripped while 'so stacked. A trade-name or trade-mark or the like may be-stamped or embossed in. or on the the member and insert.

4. The method of making a phonograph disk comprising drillingan opening in a body member offracturable material, placing an insert of non-fracturable material in said opening, adhesively supporting said insert in said opening, and then sealing said insert in place with a film of sound groove receiving material extending onto both the member and insert.

5. The method of making a phonograph disk comprising forming an opening in a body member of fracturable material, sealing an insert of non-fracturable material in said opening,-and then punching an opening through the insert in predetermined relation to the outer edge of ber of fracturable material, then placing a com- ,pressible insert in said opening and permitting the insert to expand into engagement with the edges of the opening, and then sealing the insert 0 tosaid member by afilm extending onto both the member and insert.

'7 The method of making a phonograph disk comprising forming an opening in a body member of fracturable material, placing an insert of pliant material in saidopening and locking it .therein by expansible means, and then sealing said insert in said opening and covering the sides sound record or a sound record blank, in the 50 insert of puncl'iable material without damage to the completed disk.

Having thus set forth the nature of my in- 1. The method of making a phonograph disk material, applying a-fllm of sound groove receivcomprising forming a large opening in a member offracturable material, placing in said opening an insert of amaterial adapted to have an opening L punched therein without causing fracture of the in: material to said member and said insert and -thereby sealing the latter in place, and then punchinga'locating opening in said insert. 2. The method of making a phonograph disk I comprising formins a large opening in amember of said body with films of sound groove receiving material. I

8. The method of making a phonograph disk "comprising forming an opening in a disk of fracturable material, placing an insert of non-fracturable material in said opening, and locking the insert in said opening by expansible means and a film of sound groovereceiving material extending'over one side of said member and onto said insert.

9. The method of'making a phonograph disk comprising forming a plurality of openings in a body member of fracturable material, placing an insert of non-fracturable material in each ofsaid openings,and then sealing all of saidinserts in place with films of sound groove receiving material applied to each. side of said member and extending onto said inserts.

10. The method of making a. phonograph disk comprising forming a large opening in 'a member of fracturable material, placing in said opening anfinsert of non-fracturablematerial, applying "to each side of said member and said insert in liquid form a coating of a material adaptedto setand form a film of sound groove receivin material on said member.

- RAYMOND s. neon.