Images

Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L9/00—Rigid pipes
  • F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups

Definitions

• M y invention relates to that character of phonogram-blanks which consist of a base or backing of one material, usually a molded material, and an outer surface or covering of another material, which receives the soundrecord.
• One object of my present invention is to produce a strong, light, and economical core or backing for phonogram-blanks, over the surface of which a thin coating of material to be recorded is placed.
• This part of myinvention consists in the use for the phonogram core or backing of hard rubber or ebonite, consisting of rubber or allied guns combined with sulphur by heat.
• This core or backing is coated with a thin surface of a sound-recording material, and the blank thereby produced possesses great strength, is light and economical, and is capable of withstanding rough usage 5 hence musical or other phonographic records or duplicates made on it may be handled or shipped without danger of breaking.
• Another object of my invention is to provide the core or backing just referred to, which possesses great strength and abnormal expansion, with a material which shall have the same or substantially the same-coefficient of expansion.
• a third object of myinvention is to equalize any variation in the coefficients of expansion of hard rubber or ebonite and the stearates of the metals. This variation is likely to occur when different makes of hard rubber or ebonite are used, as this material when made by different manufacturers may have different coefficients of expansion. This I accomplish by combining with the stearate of a metal an oleate of a metal, by the use of more or less of which the coefficient of expansion of the stearate may be increased or diminished to correspond with the coefficient of expansion of the particular compound of hard rubber or ebonite used.
• phonogranrblank to be of the shape of a hollow cylinder with a tapering bore and a true cylindrical outer surface.
• the backing or core for the blank may be made in any suitable manner or by molding canized india-rubber articles; or a hollow cylinder of the hard rubber or vulcanite may be made of length equal to a number of phonogram-blanks and subsequently cut to size and finished to form.
• the outer surface of the hard rubber or ebonite should be made rough to cause adherence of the recording-surface to be applied to it.
• the outer-coating which is preferably a material having the same or substantially the same coefficient of expansion as a stearate of a metal, but which maybe of any other suitable sound-recording material, is preferably applied by dipping the cylinder into a bath of the melted material. WVhen it is applied in this way, the surface may afterward be made true by turning it off in a suitable lathe after it has become cooled again.
• the external material may be applied by molding, the cylinder being placed in a mold which is slightly larger than the cylinder and the covering material poured into such mold around the cylinder, so that it will adhere thereto and will form a smooth andtrue surface without the necessingly in the usual manner of making vulsity of turning it oft.
• My experience has been, however, that the first-mentioned method is the less expensive.
• an oleate ot a metal may be added to the stearate in order to alter its expansion rate, the quantity varying according to the expansion rate required. For instance, if monostearate of soda is used the expansion may be increased by adding to it a small quantity of olcate of alumina. The proportion of the stearate and oleate used must be determined experimentally to suit the particular hard rubber or ebonite used.
• Figure 1 is a longitudinal section of the cylinder, and Fig. 2 an end view' thereof.
• A is the inner body or core, and B the outer surface of sound-recording material.
• ? Vhat I claim is- 1.
• a phonogram-blank composed of a base of. hard rubber or ebonite and an outer cm ering of sound-recording material, substan tially as set forth.
• a phonogram-blank composed of a base of hard rubber or ebonite and an outer recording-surface of diltereut materials having the same or substantially the same coefficient p This specification signed and witnessed this 22d day of March, 1885).

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Soundproofing, Sound Blocking, And Sound Damping (AREA)
• Laminated Bodies (AREA)

Description

Publications (1)

Family

ID=2483688

Family Applications (1)

Country Status (1)

• 0
  • US US414759D patent/US414759A/en not_active Expired - Lifetime

Similar Documents