US1768442A - Electrical condenser - Google Patents

Description

ELECTRI CAL CONDENSER Filed July 29 1926 INVENTOR MAL/4M WIS/Alie- ATTORNEY Patented June 24, 1930 UNITED STATES PATENT OFFICE WILLIAM DUBI ILIER, 01 NEW ROCHELLE, NEW YORK ASSIGNOE TO DUBILIER CON- DENSEB CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE ELECTRICAL CONDENSER Application filed July 29,

This invention relates to improvements in electrical condensers especially electrical condensers of the type known as rolled or wound condensers.

An object of my invention is to provide such an electrical condenser, which is strong,

, durable and capable of eiiicient operation;

which is simple in construction and ,inexpensive to produce; and to which suitable means for mounting the condenser and connecting it in circuit can be conveniently attached. p

The nature and scope of the inventlon is set forth in the following description taken with the accompanying drawings, and the novel features of the invention are pointed out in the appended claims. But this disclosure is, of course, illustrative only, and I may vary the details of structure actually shown herein without departing from the principle of the invention, as the same is defined by the broad and general meanings of the terms in which the appended claims are expressed.

On the drawings:

Figure 1 is a top plan of one form of a condenser according to my invention;

Figure 2 is an end View seen from the right of Figure 1;

Figure 3 is abottom view seen from the right of Figure 2; p

Figure 4 is a perspective view;

Figure 5 is, a top view of another form of condenser according to my invention;

Figure 6 is an end view observed from the right of Figure 5;

Fi ure 7 is a bottom view observed from the rlght of Figure 6;

Figure 8 is a perspective-mew of the condenser of Figure 5, 6 and? and Figure 9 is a view indicating how the body of this type of condenser is made.

The same numerals identify the same parts throughout.

Referring first to Figure 9 which is here presented for the purpose of illustrating how the body of a rolled or wound condenser is made, I show at 1 a sheet of conductive material such as metal foil placed on top of a sheet of insulating material such as 1926. Serial No. 125,798.

paper 2; and 3 is another sheet of metal foil placed beneath the aforesaid sheet of insulation 2 and on top of another and similar sheet of insulation 4 so that the sheet 3 lies between the sheets 2 and 4. As shown, the edge of the sheet of metal foil 1 projects on one side beyond the adjacent edges of the sheets of insulation 2 and 4, and the sheet of metal foil 3 projects at the opposite side along one edge beyond the adjacent edges of the sheets 2 and 4. When the sheets 1, 2, 3 and 4 are wound up to make a roll, one edge of the sheet of foil 1 will roject at one end of this roll, and one edge oi the sheet of foil 3 at the other end; while the opposite edges of the sheets of foil 1 and 3 will be inside the roll and covered by the sheets of insulation 2 and 4 which,overlap same. In vpractice, the ends of the sheets of insulation 2 and 4 are caused to project beyond the ends of the sheets of foil 1 and 3 so that the insulation which is paper orsome other suitable material, can be wound up in several turns on a rod or roller 5 before winding of'the sheets of foil 1 and 3 begins, and when the operation of winding is finished, the roll of foil and insulation which is spindle 5 and compressed so as to flatten it as much as possible and provide it with top, bottom and sides, as indicated at 6 in Figure 4. In this view the numerals 1 and 3, as before, indicate the projecting edges of the two sheets of foil, and by'connecting terminals to these two sheets of foil, the condenser can be put in circuit, and the sheets of foil will be of opposite polarity in operation.

After compressing the body 6 of the condenser and giving it the shape required, it is covered with a wrapping or sleeve of some suitable material such as cardboard, providing a casing 7. The material of the casing 7 is simply bent and folded around the body 6 of the condenser and secured in place in any suitable way, the ends of this wrapping or tubular casing 7 being open. Such a condenser can be placed in circuit by joining terminals to the projecting edges of the sheets of foil 1 and 3 as above described, but for the sake condenser to be handled desired, I attach to it a suitable member .for supporting it in position and enabling it to be connected in circuit more easily. To this end I may employ a metallic strip 8 which is laid against one outer face of the casing 7 and bent over the edge at one end thereof, as indicated at 9. The strip of metal may, as shown, be placed against the bottom of the condenser; that is, the lower side or face of the casing 7, the turned over end of the metallic plate 8 extending over the edge of the bottom at one end and into the casing toward the projecting edge of the sheet of foil 3 but not makin -contact therewith. The plate or sheet of metal 8 extends beyond the opposite end of casing 7, where it is bent back upon itself, or doubled, as shown at 10 and then turned upward as indicated at 11 to close substantially the opposite open end of the casing 7 and the edge of this upturned portion 11 is bent down upon the top of easing 7 as indicated at 12. Inside of the adjacent end of the casing 7 is a strip of metal 13 in electrical contact with the projecting edges of the turns of the sheet of metal foil 1, and this strip of metal is caused to extend out of the adjacent end of the casing 7 and bent down on top of the casing 7 under the downturned edge or flange 12, and then back on top of this flange 12, as indicated at 14; so that if a wire is soldered to this end 14 O1 put under the end 14 when the latter is bent down upon the portion 12 of the plate 9, the conductive element or sheet of metal foil 1 can be joined to one side of the circuit which is to receive the condenser. The doubled projecting part of the plate 8, comprising the portion 10 is pierced to receive a couple of eyelet rivets 15 for convenience in mounting the condenser, and at the opposite end a terminal strip 16 'can be soldered to the projecting edges of the turns of the conductive element or sheet of metal foil, and extend out of the adjacent end of the casing 7 to enable the condenser to be joined to the opposite terminal of the circuit. This terminal 16, instead of being a perforated strip can be in the form of a wire, and the adjacent end of the casing can be filled with wax, as indicated at 18 to cover the edge of the sheet of foil 3, and the points of contact of the strip 16 or wire therewith. lVax can also be employed to fill the opposite end of the casing 7 between the projecting edge of the foil 1 and the portion 11 which closes said end.

Since the conducting strip 13 makes .con-

of enabling this and mounted as tact with the ortions lO, 11 and 12 of theplate 8, a con uctor oined to the plate 8 at any point, as well as to the end of the strip 14 will be connected to one pole of the condenser. Hence, the plate 8 secured as dewith respect to the circuit and the e ectricalappliances therein with which it is to be used. The condenser is thus provided with very convenient means for a panel or in a casing, for example, when it is desired for use in a radio set, a rectifier, or with any other electrical appliance.

The condenser of Figures 5, 6, 7 and 8 is similar to the condenser of Figures 1, 2, 3 and 4, except that the plate at the bottom ofthe casin 7 is not of the same width throughout, ut tapers as shown at 8 from the doubled-over portion comprising the part 10 towards the end which 1s bent over at 9. Further, the portion of the plate 8 which is bent up against one end of the casing 7 and turned down upon the top thereof, is not continuous, butis provided with a central notch or recess 19, and in the adjacent end of the casing 7 is a contact strip 20 which is soldered to the projecting edges of the foil 1, is'then bent to extend outward through the notch or recesses 19 and is secured against the to of the portion 10. This condenser, as be ore, can be connected in circuit by joining wires to the member 8' at any point thereof, or by securing a wire to the outer end of the contact strip 20 and uniting the other terminal of the condenser in circuit by means of the contact strip 16.

From the foregoing it will be seen that I have provided a very simple but practical condenser which can be cheaply made'and will give very good service, and the means for mounting it in position are easily attached and quite effective in use; since the member 8 grips the casing 7 securely at both ends by means of the turned over edge 9 and the upturned portion 11 and downturned edge or flange 12.

Having described my invention, what I believe to be new and desire to secure and protect by Letters Patent of the United States is 1. A condenser comprising a body, and casing in the form of a sleeve enveloping the body, and open at its ends, a plate engaging the outer face of the casing, one end of the plate being turned over theedge of the casing at one end and extending beyond the casing at the opposite end, said plate extending over the casing at said opposite end and engaging the casing on opposite sides, the plate being thus attached to the casing, the

mounting it on condenser having a plurality of terminals,

projecting out of one end of the casing, said end being filled with an insulating embedment to seal the same, and a mounting member attached to the casing and substantially covering the opposite end of the condenser.

3. A condenser comprising a body, a sleeve enveloping the body and forming an open-ended casing, a. contact projecting from one end of the casing, said end of the casing being filled with an insulating embedment to seal the body therein, a plate in contact with the exterior of the casing and having one edge thereof bent over the edge of? the casing at one end, said plate extending beyond the opposite end of the casing and being doubled 'upon itself, and then bent up over said opposite end of the easing and down upon the top of the casing, eyelets carried by the plate in the portions which are doubled together, to receive fastening devices for mounting the Condenser, and a contact strip secured to the op osite end of the body of the condenser an projecting out of the casing and engaging the top thereof and turned down upon the edge of said plate.

In testimony whereof I afiix my signature.

VILLIAM DUBILIER.

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