US1999874A

US1999874A - Electrical condenser

Info

Publication number: US1999874A
Application number: US566001A
Authority: US
Inventors: Herman L Hartzell
Original assignee: Motors Liquidation Co
Current assignee: Motors Liquidation Co
Priority date: 1931-09-30
Filing date: 1931-09-30
Publication date: 1935-04-30
Anticipated expiration: 1952-04-30

Description

vApril 3o, 1.935.

H. L. HARTzELl.

ELECTRICAL CONDENSER Filed Sept 30, 1931 wwf III/IIII/IIIIII lll/l VIII/I1 Patented Apr, 3o, 193s mesne assignments, to General Motors Corporation, Detroit, Mich., a corporation of Delal ware Application Septemberr 30, 1931, Serial No. 566,001

10 Claims.

This invention relates to an electrical condenser and more particularly to relatively small cylindrical condensers adapted for use with ignition apparatus for internal combustion engines 5 of the automotive type.

Itis one of the objects of the present invention to provide a condenser of simple design and economic construction which will be substantially moisture proof. More specifically, it is an object to provide for sealing in the insulated terminal wire of the condenser which extends through one end of the condenser case.

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawing wherein a. preferred embodiment of one form of the present invention is clearly shown.

In the drawing:

. The figure of the drawing is a longitudinal sectional view on an enlarged scale of a condenser embodying the present invention.

The condenser embodying the present invention comprises convolutions of foil strips 20 and 2| alternating with nonconducting strips 22, the strips being wound upon a cylindrical mandrel (not shown). The'side margins 23 of the 4 foil strip 2|)A extend beyond the side margins of the insulated strip 22 -at one edge thereof, and beyond the other edge of the insulated strips 22 extends the side margins of the other foil strip 2|. VAfter winding these strips of foil andv insulation upon a mandrel, the assembly is coveredy with a wrapping of several turns of insulation paper 24. Then the mandrelis withdrawn. The condenser body is then impregnated with wax by the well-known vacuum lmethodvof impregnation. After impregnating and permitting the wax to cool, an insulated terminal wire having a bared portion 3| is soldered to the projecting margin of foil strip 2|, the solder being indicated at 32. This condenser assembly is now ready to be placed within a tubular condenser Gase the closed end 4| of which is provided with ahole 42.` Before placing the assembly within the case there is placed within the case a disc 43 having pointed projections 44 adapted to contact with the bent. over side margin 23 of the coil 20. Between the vdisc 43 and the end wall 4| is located a metal strip 45 having a portion bent around at 46 and located as indicated at 41 between the` disc 43 and the bent side margin 23 of the coil 20.

The condenser assembly comprising the windwithin the case 40, the assembly being pushed into the case so that the foil margin 23 will be in firm engagement with the disc 43. Then a cap having a neck 5| apertured to receive the conductor 30 is placed around the conductor ings and the attached conductor 30 is placed.

(c1. 175-41) I 'f while the conductor dangles loosely over the open end ofthe case 40. 'I'hen a quantity of wax or pitch or other suitable insulating compound 60 is poured into the condenser and while this wax is still plastic the cap 50 is moved along the c'onductor 30 and into the case 40 thereby abutting the adjacent end of the wrapping 24 and thereby displacing some of the pitch causing the same to ow into the neck 5| and to seal the joint between the conductor 30 and the neck 5|. The cap 50 is held firmly in position by deforming or spinning over the normally cylindrical periphery of the case 40, indicated in dot-and-dash lines 40a in the drawing to form an internal flange 48 bearing against the outer surface of the cap to hold the same permanently in position. During the operation of spinning the iiange 48, the cap 50 is forced downwardly into the body of pitch 60 thereby crowding more of the pitch into rthe neck 5| and downwardly into the body of the condenser. The operation offorming the flange 48 also causes the cap 50 to be forced against the adjacent edge of the .wrapping 24 thereby causing the same to be deformed as indicated at 24a. This assists also in perfecting the seal between the outer periphery cap 50 and the adjacent wall of the case 40.

Following the operation of attaching the cap 5U the electrical connection between the foil margin 23 and the case is completed by applying solder at 10 to that portion of the strip 45 which was accessible through the hole 42.

Preferably, the strip 46 is attached to the foil margin before' assembling the disc 43 with the condenser lbody and before placing the latter in the case. The strip 46 is a tinned copper strap which is united with the foil margin 23 simply by heating the strip 46 while held in contact with the foil margin.

While the form of embodiment of the present invention as herein disclosed, constitutes a Dres ferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

What is claimed is as follows:

1. A condenser comprising in combinatio a tubular metallic case having an integral end wall; a condenser body of insulated foils; means connecting one of the foils with the case; `a flexible insulated wire connected with another foil; a cover for the case having an aperture through which the wire passes; a body of plastic insulating compound in the case and between the condenser body and cover; means including a part of the case for securing the cover in position and for forcing the insulating compound against the condenser body and about the connected end of the insulated wire.

2. A condenser comprising 'in combination; a

tubular metallic case having an integral end wall, a condenser body of insulated foils; means connecting one of the foils with the case; a flexible insulated wire connected with another foil; a cover with an apertured neck having outwardly projecting flares through which said connector wire passes; a body of plastic insulating compound in the case, said compound being located between said body and cover; means including a part of said case for securing said cover in position and for forcing said compound against said body and against said flares of said cover so as to substantially surround the wire and foil con.

nections.

3. A condenser comprising in combination; a cup-shaped metallic case; a condenser body of insulated foils; one of said foils having a marginal edge adjacent the bottom wall and connected therewith; a flexible insulated wire connected with another foil; a cover having a neck through which the connecting wire passes; a plastic insulating compound in said case between said body and cover; -means including a part of said case for securing said cover in position and forcing said marginal edge against said case and urging said'compound against said body and cover forming a seal between said neck and insulated wire.

4. A condenser comprising in combination; a tubular metallic case; a condenser body of insulated foils, each of which has an exposed marginal edge; means for connecting one of the marginal edges with the case; a exible insulated conducting wire connected with another of said marginal edges; a cover having an apertured projection through which said conducting wire passes; a plastic insulating compound embedding the connected end of said conductor; and means on the case for securing said cover in position and for forcing said compound against said condenser body and cover and about the wire and f oil connection, so as to form a seal between said conductor and apertured projection and about the foil connection.

5. A condenser comprising in combination; a tubulai` metallic case; a condenser body of insulated foils, one of said foils having a marginal edge; a connector engaging said marginal edge and connecting said edge with said ease; an insulated wire connected with another foil; a disc having a charnfered opening through which said connecting wire passes; ayieldable insulating compound in said case between said condenser body and disc; means including a part of said case for securing said disc in position and forc- .ing said marginal edge against said connector and case and urging said compound against said body and cover; and means including said disc for forcing the insulating compound to enclose the connection of the wire and foil, whereby th connection is sealed against corrosion. i

6. A condenser comprising in combination; a tubular metallic case; a roll of conducting elements and insulating material; a conductor for connecting one of said elements with said case; an insulated wire connected to another of said elements; a cover for said case having an aper tured neck through which said conductor passes; a plastic insulating compound within said case', and means at one end of said case securing said cover in position and forcing said compound against said roll and cover to form a seal between the same and so as to immerse the connection of the wire with the said other conduction element.

7. A condenser comprising in combination, a tubular body comprising windings of foil and strips of insulating material; a cup-shaped tubular metallic case inclosing said body; a conductor for connecting one end of one of the foils with the case; an insulated wire connected with another foil, a wrapping of sheet insulating paper about the condenser body and having an edge extending beyond the body; a cover for said case having an aperture through which the wire passes; a body of plastic insulating compound within the case; and means including a part of said case for securing said cover in position and for forcing the cover against said wrapping edge and insulating compound so as to force the body against the bottom of the case and to press said compound between the cover and wire to form a seal between said wire and aperture of said cover, and so as to cause the compound to ilow about the connection of the wire with the said foil.

8. A condenser comprising in combination; a tubular metallic case; a tubular condenser body of insulated foils and having layers of insulating material about and protruding beyond one end of said body; a flexible conductor joined to one of said foils; a conductor connected to another foil, said conductor being interposed between the body and the case; a cover having an apertured projection through which said flexible conductor passes; a plastic insulating compound embedding the flexible conductor and extending through the body within the case; common means including a part of the case for securing the cover in place and for forcing the layer of insulation to carry the body against the bottom of the case, the cover forcing the insulating material against the condenser body and causing it to immerse the end of said flexible conductor that is joined to the foil.

9. In a condenser for relectrical ignition purposes the combination comprising a drawn metal cup-like casing, a condenser assembly disposed within the casing and including alternating insulators and foil strips having oppositely exposed' margins, and a flexible insulated wire bonded in electrical connection to one of said foil margins, an apertured cover for the case and disposed about one end of the flexible wire so as to enclose its bonded connection with the foil margin, a quantity of insulating compound filling the remaining space within the case and cover, and means including a part of the case and cover for forcing the cover against the insulating compound so 'as to press the compound against the condenser assembly and substantially submerge the bonded connection between the wire and the respective foil margin.

10. In an electrical condenser having a case, a condenser body of alternating insulators and foil strips each with an exposed portion, and in which a flexible conductor is soldered to one of the exposed portions, and a cover for closing the case and guiding the flexible conductor, the combination comprising, a quantity of insulating compound illling the remainder of the case, and means including the case for causing the cover to press against the insulating compound whereby the insulating compound is caused to flow substantially'into all of the recesses within the condenser assembly and to completely cover the soldered connection between the flexible conductor and its respective foil margin.

HERMAN L. HARTZELL.