US1315968A - Method of making condensers - Google Patents

Description

.provement in UNITED STATES PATENT oEEIoE.

WILLARD I-I. KEMPTON, or wILKIEsBUEe, AND PHILLIPS THOMAS, 0E EDGEWOOD, PENNSYLVANIA, ASSIGNORS To WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION or PENNSYLVANIA.

No Drawing.

To all whom it may concern.

Be it known that we, WILLARD H. KEMP- TON, a citizen of the United States, and a resident of VVilkinsburg, in the county of Allegheny and State of Pennsylvania, and PHILLIPS THOMAS, a citizen of the United States, and a resident of Edgewood, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Im- Methods of Making Condensers, of which the following is a specification.

Our invention relates to condensers and it has, for its primary object, the provision of a method which shall facilitate the c0nstru0- tion of condensers comprising superimposed layers of insulating material and a conducting material treated with a suitable wax.

It is well known, to those familiar with the art, that halowax, which is a chlorinated naphthalene, possesses certain electrical properties which particularly adapt it for use as a dielectric in condensers. hese 1nherent advantageous properties are offset, however, to a certain extent, by the injurious effects which halowax has upon the workmen who construct the condensers, the wax being especially irritable to the skin when brought in contact therewith. One object of our invention resides, therefore, in the provision of a method by which condensers employing halowax as an impregnating agent may be constructed and which will avoid the injurious efiects of the halowax experienced by the workmen.

Our invention will be more fully understood by a brief description of the method of constructing condensers employing a suitable wax as an impregnating agent. Condensers of the above designated character are ordinarily formed by employing a suitable conducting material and an insulating material, such as paper. Sheets of suitable size of each of these materials are cut and stacked in alternate relation or a plurality of strips of conducting material, insulated from each other by strips of paper or other suitable material, are wound to form the condenser. Such superposed material is then subjected to a bath of molten wax,

which, in this case, is chlorinated naphthalene or halowax, until the paper or insulatin material is thoroughly imdpregnated, after which the body is remove Specification of Letters Patent.

from the Patented Sept. 16, 1919.

Application filed March 7, 1919. Serial No. 281,223.

wax and allowed to cool, usually being disposed in a cold press.

The stacked material is then provided with'a plurality of terminals connected to the respective layers of conducting material. In order to secure'terminals properly to the conducting material, it is essential that the wax be removed from certain portions of the conducting material to which the condensers are to be fastened. This, therefore, necessitates considerable handling of the impregnated body and, when halowax is employed as the impregnating agent, this handling is made difficult on account of the injurious effects of the halowax upon the workmen.

We have discovered that the injurious efiectsof the halowax may be avoided by coating the impregnated stacked material with a protective coating of suitable material, such as shellace. This protective coating may be provided by dipping the cooled condenser in shellac and allowing it to dry, the coating of shellac being of only sufiicient thickness to completely cover the coating of halowax. We have found that a coating of shellac may be employed in this manner without any injurious effects upon the dielectric qualities of the halowax. This coating of shellac may be applied before the terminals are secured to the conducting material to thereby protect the workmen from the effects of the halowax when handling the stacked material in the process of fastening the terminals thereto.

A condenser formed in this manner is then disposed in any suitable protective casing of suflicient thickness to protect it from shocks or blows experienced in its commercial use. It should be noted that the coating of shellac applied to the condenser is intended only for the protection of the workmen while constructing the condenser and is not intended to act as the protective coating for the condenser after it has been completely formed and ready for commercial use.-

Although we have specifically described a method by which condensers may be constructed in accordance with our invention, it is obvious that minor changes may be made therein without departing from the spirit of our invention, and we desire that no limitations shall be imposed except such as are indicated in the appended claims;

We claim as our invention:

1. A method of constructing condensers that comprises superposing alternate layers of conducting material and insulating material, impregnating the insulating material With chlorinated naphthalene, providing the body thus formed with a relatively thin coating of material non-injurious to the skin, securing terminals to the conducting material and disposing the body in a suitable casing.

2. A method of constructing condensers that comprises superposing alternate layers of conducting material and insulating material, subjecting the superposed material to a bath of chlorinated naphthalene, applying pressure to the body in a cold press, coating the body with shellac, securing terminals to the conducting material and disposing the body in a suitable casing.

33. The method of constructing condensers that comprises impregnating an assembled condenser with chlorinated naphthalene and providing the body thus formed With a relatively thin coating of material non-injurious to the skin.

In testimony whereof, We have hereunto subscribed our names this 13th day of Feb, 1919.

WILLARD H. KEMPTON. PHILLIPS THOMAS.