US1932057A

US1932057A - Record core

Info

Publication number: US1932057A
Application number: US486204A
Authority: US
Inventors: Wheeler William
Original assignee: Individual
Current assignee: Individual
Priority date: 1930-10-03
Filing date: 1930-10-03
Publication date: 1933-10-24
Anticipated expiration: 1950-10-24

Description

EXAWER moss REFERENCE W. WHEELER Oct. 24, 1933.

RECORD CORE Filed Oct. 3, 1930 3 Sheets-Sheet l g \L- \\\@U avwentoz MM 6 came/13 Oct. 24, 1933. w. WHEELER 1,932,057

RECORD GORE Filed Oct. 3, 1930 3 Sheets-Sheet 2 ms REFERENCE W. WHEELER maconn com:

Filed Oct. 3, 1930 O oo coo 3; o .2

oooooo0 6 Sheets-Sheet 3 Elvwewtoz Maw Patented Oct. 24, 1933 UNITED STATES PATENT OFFICE This invention relates to records for phonographs, talking pictures and broadcasting, and my improvements are directed to a process of producing the cores of records fom fibre board, whereby said cores will be free from any tendency to warp or become distorted.

The inexpensive and light weight characteristics of fibre board render it desirable as a core for records, but heretofore no satisfactory treatment for this material has been known that enables disks thereof to maintain a permanent fiat condition, such as is necessary for record making purposes.

Therefore my invention consists in treating disks of fibre board by certain steps in a process that have the effect of destroying the life in the fibres to render them inert, and in compacting the board.

The steps of the process comprise:

(l) Producing a disk of fibre board, as by stamping it from a sheet and providing the central orifice therein; (2) chamfering the disk edges; (3) rotating the disk at an outward portion of its diameter between opposed pressure rollers to have the effect of expanding the disk diameter radially; then reducing the thickness of the disk at its central portion, as by grinding away the surface material, at both sides, within a limited radius; then subjecting the chamfered peripheral portion of the disk to treatment by a quick drying gum solution, to seal the edge; then passing numerous high tension, electrical discharges through the disk to render it foraminous and burn the tension fibres, thereby taking the life out of the material. The next step consists in coating the disk with a suitable fluid composition of vegetable origin and, while the composition is moist, there is dusted or sifted thereon a coating composed of gum and zinc oxide.

Record cores thus produced may have placed thereon disks of paper (which may bear pictures or other surface representations, which previously have been perforated by numerous high tension, electrical discharges passed therethrough; and the cores, with their paper faces, are then subjected to moulding pressure at suitable temperature which causes the surfacing material on the core to penetrate the perforations in the paper disks, and to constitute record surfaces with the moulded sound recording lines imparted thereto by the matrix.

Other features and advantages of my invention will hereinafter appear.

In the drawings:

Figure lisaplanviewofadiskthathasbeen stamped or otherwise formed out of a sheet of fibre board, with a central hole therein.

Fig. 2 is a central sectional view of Fig. 1.

Fig. 3 is a like section showing the peripheral edges of the disk to have been chalnfered.

Fig. 4 shows a disk undergoing pressure between rollers.

Fig. 5 is a plan view of a disk with its edges chamfered and its centre recessed.

Fig. 6 is a section through the centre of Fig. 5.

Fig. 7 shows a disk undergoing treatment at its chamfered edges in a sealing bath.

Fig. 8 is a side elevation of an apparatus with which the disks are perforated by electrical discharges while sliding by gravity into a surfacing bath.

Fig. 9 is a plan view of Fig. 8.

The basis for my improved record core is fibre board, by which is meant Ward, pasteboarg "GT-Miler board composed of fibrous ma erial.

Disks, such as indicated at 1, are cut or stamped from this material and the usual stud or pin hole 2 for a record may be produced in the same operation. As another step in the process, the opposite peripheral edges of the disk are beveled down, or chamfered, as at 3, giving the peripheral portion of the disk 2. wedge-like appearance. This is for a purpose which will be referred to hereinafter. Also the disk, in an outward annulus over its area, indicated at 4, is subjected to pressure between opposed rollers, each as are shown at 5, 5 in Fig. 4. This is for the purpose of expanding the material of the disk at the outward annulus 4 thereof, to compensate for the -moulding pressure that is subsequently applied.

Still another step in producing the core consists in recessing the disk, at both sides, in the central, circular area 6, the recesses being formed as by grinding out the material to a desirable depth in such area. By thus recessing or depressing the central area, the disk material in the region thus represented is relieved from the hydraulic or other heavy moulding pressure when that is applied inthe formation of the record, in consequence whereof the surrounding portion of the device which is to bear the music, or other sound recording lines, becomes thereby more efiiciently impressed In Figs. 7 there appears a shallow bath 7 which contains manila gum dissolved in acetone or acetic ether in propor ions which may e approximately 1 lb. manila gum to 2 gals. acetone or acetic ether. The disk (or a number thereof) is rotated with its chamfered peripheral portion entered in this solution, for impregnation thereby, the chamfered edges being more are at once removed therefrom and are found to readily absorbent than the disk surfaces would have received a surfacing of the bath composibe. The solution being highly volatile, dries intion which has been described. Before this surstantly and seals the disk edge interstices exfacing dries the disks have sifted thereon a powposed by the chamfering, the gum also accorddered mixture of manila gum and zinc oxide, the ing a degree of stiffness to the chamfered pezinc oxide being in pfiipoftlons of from 10% to riphery. 50% of the manila gum. This powdered mix- Still another step in my improved process of ture adheres to the surfacing composition, and making records consists in subjecting the disks the disk, thus treated, is in readiness to have a to the influence of high tension, electrical dispaper record sheet placed thereon. charges, for the purpose of perforating the disks This record sheet is a disk of paper which may with numerous tiny ,orifices, produced by the have printed or otherwise imposed thereon a passage of electric sparks through the disk mapicture or other representation. terial, burning the fibres thereof and rendering Said disk of paper may be slightly larger than the material inert and incapable of warping or the core disk and has been subjected to the elecdistortion. trical perforating process that has been described For this purpose I employ the apparatus shown with respect to the core disk, so that it also is in Figs. 8 and 9, said apparatus comprising a meforaminous. tallic plate 8 which is supported in an inclined Said disk of paper is placed upon the treated position as by the standards 9, 10, the standard core disk and then both disks are subjected to 10, at the low end of plate 8 being represented hydraulic or other suitable pressure of about as extending from a vessel 11, which is adapted tons, at a temperature of from 150 to 300 deto contain a liquid composition, constituting a gIeeS at which Pressure and temperature t bath. The angle at which plate 8 is set may be record lines are produced in the paper disk from sufficiently steep to enable the disks, when placed th m rix, th h t d p r a in h thereon, to slide down said plate by gravity, nd surfacing composition from the core disk to penethe vessel 11 is so related to the lower end of irate t p p disk through the perforations plate 8, that the disks will plunge into the bath therein, and to constitute the record surface. Also upon leaving the plate. A plate 12, of insul in the mould the edge material of the slightly tion material, is placed over plate 8, in spaced larg diameter of the P p disk ds v e parallelism therewith, and is supported as by P p e edge o the d core, binding Said screws 13, whereby also the spacing between d and ivin a fi i h appearance t h r

plates

8, 12 may be adjusted. Numerous elec- 0rd. trodes, 14, are carried by insulation plate 12, the t is o be understood that the addition of the electrodes for example being in the form of or- P p disk D t r d c is not absolutely dinary wood screws or machine screws that are necessary f he pr i n of a sound producing threaded through plate 12, with th ir nd oprecord, because in some instances the record core, posed to plate 8 and distanced from said plate alone, and w t the Surfacing P p disk, can sufficiently to enable a high tension, static curbe Subjected t the p s e und r eat i the rent electrical discharge to pass between said matrix for the creation f h s u d pr du i electrodes and said plate 8. lines thereon.

Electrical current may be supplied from a the record core can, if desiredb surfaced power source as by the circuit wires 15, through with Shellac its Surfacing t a the intermediary of high tension coils 16, whose Instead Of the hereinbefol'e recited liquid secondary windings re shown as including i composition of rice flour, water glass and manila parallel respective groups of the electrodes 14. 811111 as the me fi t S- TOI' t e record The arbitrary arrangement of the electrodes Cores I y in some instances, p y 8- 0 14, indicated in Fig. 8, as carried by insulation Position consisting o approximately equal P plate 12, shows groups of the screws disposed in Portions of oe Q 11 a d a Solutio of a succession of transverse areas, whereby each w with from 10% to 50% 0f manila 8 disk, in sliding down plate 8, passes between a e manila gum. according to the proportion large number of electrodes and the plate 8, so that thereof employed, flfieets the flowing qu y of each disk in transit becomes penetrated by the composition; also hardening its surface, and merous electrical discharges. rendering it Waterproof- The bath in vessel 11 is. composed of approxl- This Substitute composition y s fo mately cue part of rice flour dissolved in two drying, have 8 mixture Powdered m ni gum parts of water glass. a, proportion and zinc dusted over its ace. Witfi'a is added 5 the bath, the ntit ereo fibre board disk rendered foramln ous by the pene- Em g from 10% to 50% of the co bin d i e tration thereof with numerous high tension, elecflour and water glass mixture. The consistency trical discharges, said disk being coated with a of the mixture is affected by the proportion of surfacing composition such as hasbeen described, manila gum used. and then subjected to heat and pressure for the Congo 1 u can be used either instead of the purpose of impressing the record lines thereon, ma 1 u or in conjunction therewith. Also it is found that the tiny perforations through the rosin can be used as a substitute for the gums disk permit the liberation under the pressure of provided a sufficient proportion of rice flour be occluded gases which otherwise might cause used to render the product hard. blistering of the record surface to occur.

It is to be understood that I intend water glass Variations within the spirit and scope of m to equally comprehend a suitablesilica solution, invention are equally comprehended by the foreand for rice flour other suitable v table flour going disclosure. may be substituted. Or, in place of our, either I claim: lam black or rotten stone may be employed. 1. The method of making record cores which u ve been a e "o aim the best results consists in producing disks from fibre board, ap-

plying moderate pressure to an annular, outward by using rice flour.

'1" e disks that have been immersed in the bath portion of the disks, recessing the central portions of said disks, and burning perforations throughsaid diskstolnllthefibretension.

2. The method of making record cores which consists in producing disks from fibre board, chamfering the edges of the disks, applying moderate pressure to an annular, outward portion of the disks, recessing the central portions of said disks, treating the chamfered edges with a volatile gum solution. and burning perforations through said disks to kill the fibre tension.

3. The method of making record cores which consists in producing disks from fibre board, applying moderate pressure to an annular, outward portion of the disks, recessing the central portions of said disks, burning perforations through said disks to ln'll the fibre tension, and applying a surfacing composition to said disks.

4. The method of making record cores which consists in producing disks from fibre board, chamfering the edges of the disks, applying moderate pressure to an annular, outward portion of the disks, recessing the central portions of said disks, treating the chamfered edges with a volatile gum solution, burning perforations through said disks to lnll the fibre tension, and applying a surfacing composition to said disks.

5. The method of making records which consists in producing disks from fibre board, killing the tension of the fibres thereof, coating the surfaces of the disks with a composition of vegetable flour, water glass and gum, and producing the record lines under heat and pressure.

8. The method of making records which consists in producing disks from fibre board, killing the tension of the fibres thereof, coating the surfaces of the disks with a composition of rice flour. water glass and manila gum, and producing the record lines under heat and pressure.

'7. The method of making records which consists in producing disks from fibre board, killing the tension of the fibres thereof, coating the surfaces of the disks with a composition of vegetable fiour, water glass and gum, dusting the composition while moist with powdered gum and zinc oxide, placing sheets of foraminous paper on the surfaced disks, and producing the record lines under heat and pressure.

8. The method of making records which consists in producing disks from fibre board, killing the tension of the-fibres thereof, coating the surfaces of the disks with a composition of vegetable water glass and gum, dusting the composition while moist with powdered gum andvzinc oxide, placing-sheets of foraminous paper, which may bear pictorial representations, on the surfaced disks, and producing the record lines under heat and pressure.

9. A record core comprising a disk of fibre board that is provided with numerous burnt i n perforations.

10. A record core comprising a disk of fibre board whose edges are chamfered and sealed with gum, said disk having centrally disposed recesses at its sides, and having a compacted outward annular portion.

11. A record core comprising a disk of fibre board that is provided with numerous burnt-in perforations, said disk bearing a surfacing composition of vegetable flour, water glass and manila gum.

12. A record comprising a disk of fibre board that is provided with numerous burnt-in perforations, said disk bearing a surfacing composition of vegetable fiour, water glass and manila gum, and record lines impressed therein.

13. A record comprising a disk of fibre board that is provided with numerous burnt-in perfo rations, said disk bearing a surfacing composition of vegetable fiour, water glass and manila gum, a foramious paper disk on said composition, and record lines impressed upon the composition extruded through said paper disk.

14. A record comprising a disk of fibre board that is provided with numerous burnt-in perforations, said disk bearing a surfacing composition of vegetable flour, water glass and manila gum, a foraminous paper disk, bearing a pictorial representation, on said composition, and record lines impressed upon the composition extruded through said paper disk.

15. A record surfacing composition consisting of rice flour water glass and manila gum.

- 16. The method of making records which consists in producing disks from fibre board, passing numerous high-tension electrical discharges through the disks to kill the tension of the fibres, coating the surfaces of the disks with a composition of vegetable flour, water glass and gum, and producing the record lines under heat and pres- WILLIAM :l -m :4-