US2052700A - Terminal construction - Google Patents

Description

Sept 1936- c. DE LANGE TERMINAL CONSTRUCTION FilBd Feb. 4, 1932 E 6 m L H R N D R m .0 m n V 5 NE 1 2 1% N 2 2 Y I. B

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Patented Sept. 1, 1936 TERMINAL CONSTRUCTION Cornelia de Lange, Eindhoven, Netherlands, asaignor to Radio Corporation of America, a corporation of Delaware Application February 4, 1932, Serial No. 590,881 In Germany February 11, 1931 2 Claims. (Cl. 173-311) The present invention relates to condenser conpr sed by h nd int h ap h wn in he hi;- structions and more particularly to a novel terure. After they are arranged adjacent each other minal construction for electrical instruments of as shown in Figure 1, pressing plates 2, preferthe type that are enclosed within a housing. ably of sheet iron, are arranged on either side to It is known that in the case of stacked or wound engage the side surfaces of the exterior units 5 condensers a casing is usually provided for en and the aggregate consisting of units and pressclosing the condenser units and thus protect them ing plates is housed in its casing 3 which is preffrom moisture or air. In such devices it has been erably of metal. For this purpose the units are quite a difllcult problem to provide suitable terfirst slightly clamped together, by compressing minals for the condenser units so as to facilitate the assembled units and pressing plates by hand, connection of the condenser units with external viz., to such extent that the entire parcel slides electrical circuits and at the same time provide easily into the aperture of the casing. It is, of the proper seal to protect the electrical apparatus course, obviousthat the parcel will engage the from moisture or air. casing pinchingly after being slipped in as a The present invention has for one of its objects whole. The pressing plates 2 are provided with the construction of a terminal for enclosing elecribs 4 which pass along the length of the units trical units such as condensers and the like which and with ribs 5 arranged in a direction normal are economical to manufacture, effective and efthereto. Thus a satisfactory stiffness is obtained ficient from every point of view. at a very low thickness of material which is im- 1 In the type of condenser here being discussed portant because it is not desirable that the weight the casing is usually made of metal and it is of the pressing plates should determine the total preferable that all theseams present in the casweight of the condenser. After the units are ing should be closed by fianging and/or soldering housed in the casing they are impregnated, for which enables the casing of being sealed so as example, with petroleum Jelly which is desigto be perfectly liquid repellent. Sealing condenser nated in Figure 1 by 6 and which fills the casing casings by means of a fianging tool has hitherto substantially. For the sake of simplicity the not been adopted in manufacturing condensers. upper side of the units is shown in Figure 1 as The process is further simplified if initially a being not covered with the impregnated means. casing is used which apart from the cover is Figure 2 shows a condenser according to the moulded in one piece so that it does not present invention as it appears when the cover is secured seams. In this case if the casing is made of to it. Both the cover I and the bottom la are metal the only operation for ensuring a liquid secured to the middle part lb by fianging and/or repellent seal consists in securing the cover in soldering so that at these points a liquid repellent position by fianging and/orsoldering. It is also seal is secured. 8 designates the various points possible for the casing to be made of material at which the various electrodes are taken out. to be moulded which self-evidently prohibits the One of these points is shown in detail in Figure fianging and/or soldering of the cover so that 3. The cover I has a re-entrant part 9 in which another method has to be adopted for p mitan aperture I0 is formed for the passage of holting 0f Iiqllld ep e S a being ensured. low flanged bushes II and I2 pinchingly slipped The invention Will be mere readily understood into one another. The flanged bushes are ceny reference t t f l wing detailed specificatered in the apertures and maintained insulated 171011 d t d aw from the cover by means of discs l3, M, ii and In t a l6 of insulating material which are pressed to- Figure 1 is a section through a condenser unit gether by the flanges of the bushes so that a Such as is Shown in Figure 2 w g th co liquid repellent seal is obtained and any move- D d elements of the de ment of the bushes in a lateral direction, is im- Figure 2 is a perspective view of a closed conp sible. de er acc di t the invention- The disc l5 consists of a felt layer impregnated Fi ure 3 is a sect on v ew of e passa e of with an'insulating lacquer and serves essentially an electrode. for the liquid repellent seal. The disc i4 lying in Figure 4 is a sectional view taken on the line IV-IV of Figure 2.

Referring to Figure 1, l designates a set of diagrammatically illustrated condenser units which after being wound on a cylindrical mandrel are the re-entrant part 9 is preferably of rubber. The discs l3 and I5, which are preferably made of a very stiff insulating material, ensure that the rubber and the rubber and the felt disc engage uniformly over their entire surface the outer A contact lip H for the connecting conductors 4 of the condenser is disposed under the flange of the bush I i. The bore of the bushes has slipped into it from without a small conical inwardly tapering pipe it! through which a conducting wire l9 coming from a condenser unit passes from the interior towards the exterior where it is soldered to the pipe. The pipe is conical to prevent liquid solder from finding its way into the interior of the condenser and causing damage there. The point of soldering is such that also the flanged bush l l with the pipe andthe contact lip l1 constitutes a mechanical and electric aggregate.

It has been established duration tests that the passage here described with a diameter of 10 mms. of the aperture in is perfectly capable of withstanding a working voltage of 1500 volts. It has also been found that such a passage conserves its good insulation resistance and hermetic properties when the condenser is caused in moist surroundings to reach a temperature such that the impregnating means is thinly liquid.

Figure 4 shows the manner of arranging the taking-through members in the cover and of fianging its edge at 2|. 22 designates the layer of solder which with this kind of flanged seam must be provided in order to ensure a perfectly liquid repellent seal at the said point.

I claim:

1. A terminal construction for condenser as semblies of the type which are placed within a housing and wherein the condenser terminals are passed through apertures formed in re-entrant portions of the housing comprising in combination, a metallic terminal member centered in the aperture, means. for insulating the terminal member from the housing comprising an outer insulation ring and an inner insulation ring, both of said rings being centered with respect to the metallic member and the aperture, said rings being arranged so as to bear upon the inner and outer walls respectively of the re-entrant portion of the housing, a pair of pressing rings cooperating with the insulation rings, a pair of tubular rivets, said rivets being arranged so that one thereof telescopes within the other, said rivets being centered in the aperture and arranged so as to press by a multiplicity of the pressing rings toward one another, the frictional forces between the two rivets being sumcient to cause the pressing rings to maintain the insulation rings into close engagement with respect to the inner and outer walls of the housing adjacent the aperture, a tapered hollow member placed within the telescoped rivets and arranged so that the small end thereof is nearest the inside of the housing, said terminal member being arranged so as to pass through the tapered hollow member, an external contact strip and means for conductively joining the terminal member, the tapered hollow member and the external conductive member, said means also acting to seal said aperture.

2. A terminal construction for condenser assemblies of the type which are placed within a housing and wherein the condenser terminals are passed through apertures formed in the housing comprising in combination, a metallic terminal member centered in the aperture, means for insulating the terminal member from the housing comprising an outer insulation ring and an innerv insulation ring both of said rings being centered with respect to the metallic member and the aperture, said rings being arranged so as to bear upon the inner and outer walls respectively of the housing, an inner pressing ring and an outer pressing ring cooperating with the insulation rings, an external contact strip positioned adjacent the outer pressing ring, a tubular metallic rivet device centered in the aperture and arranged so as to contact the contact strip and so as to force the pressing rings toward one another to cause the pressing rings to maintain the insulation rings in close engagement with respect to the inner and outer walls of the housing adjacent the aperture, said forcing action also acting to bring into good electrical contact the metallic rivet device and the contact strip, a tapered hollow member placed within said tubular rivet device and arranged so that the small end thereof is toward the inside of the housing, said terminal member being arranged so as to pass through the tapered hollow member and means for conductively joining the terminal member, the tapered hollow member, the rivet device and the external conductive member, said means also acting to seal the aperture.

CORNELIS nE LANGE.

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