US2786883A

US2786883A - Corona shield and lead clip assembly

Info

Publication number: US2786883A
Application number: US350078A
Authority: US
Inventors: Elmer J Zelt
Original assignee: General Electric Co
Current assignee: General Electric Co
Priority date: 1953-04-21
Filing date: 1953-04-21
Publication date: 1957-03-26
Anticipated expiration: 1974-03-26

Description

"vial" March 26, 1957 E. J. ZELT 2,786,883

CORONA SHIELD AND LEAD CLIP ASSEMBLY Filed April 21, 1955 Inventor- Elmer- J. Zelt,

His Attorne g.

- terminal.

United States Patent CORONA SHIELD AND LEAD "CLIP ASSEMBLY Elmer J. Zelt, Fort Wayne, Ind., assignor to General This invention relates to devices for preventing corona discharge from the terminals of high voltage devices, such as sealed gap arc discharge devices used in capacitor discharge systems, and has particular applicability to a combined corona shield and clip for attaching leadsto a terminal of such a high voltage device.

It is well known that a corona discharge is likely to occur around a conductor which is at an elevated potential. In certain capacitor discharge systems, asealed gap arc discharge gap is provided having terminals which are normally at a high potential. A corona discharge is therefore likely to occur around these terminals and it is therefore desirable to provide means for shielding the corona discharge to prevent .discharge to other elements of the apparatus rather than across the sealed gap. In addition, various leads must be connected to the terminals of the device and it is therefore desirable to provide a combined corona shield and lead clip assembly which will not only provide the requisite corona shielding effect, but also provide for readily attaching 'the leads to the It is further desirable that this corona shield and lead clip assembly be simple, inexpensive and readily assembled on the terminal.

It is therefore an object of this invention to provide a corona shield and lead clip assembly incorporating the desirable features set forth above.

Further objects and advantages of this invention will become apparent by reference to the following description and the accompanying drawing, and the features of novelty which characterize this invention will be pointed out with particularity in the claims annexed to and forming a part of this specification.

In accordance with this invention, a cup-shaped corona shield member is provided having a substantially dishshaped bottom portion, the shield member being adapted to be positioned over the terminal of a high voltage device. A lead clip member is arranged within the shield member and is secured to the rim thereof, the clip member having a plurality of inwardly projecting fingers. Some of these fingers are adapted resiliently to embrace the terminal for securing the assembly thereto and others of the fingers are adapted to have leads attached thereto.

In the drawing,

Fig. 1 is a side elevational view, partly in section, illustrating the improved corona shield and lead clip assembly of this invention attached to the terminal of a high voltage device, such as a sealed gap arc discharge device;

Fig. 2 is an exploded view of the improved corona shield and lead clip assembly of Fig. 1;

Fig. 3 is a view in perspective showing the bottom side of the device of Figs. 1 and 2;

Fig. 4 is a view in perspective, partially broken away, showing the manner of attachment of leads to the improved corona shield and lead clip assembly of this invention; and

Fig. 5 is a side elevational view, partially in section, illustrating a modified form of this invention.

2,786,883 Patented Mar. 26, 1957 shield member 4 having a substantially dish-shaped bottom portion 5 and an annular rim 6. A cup-shaped lead clip member 7 is provided arranged within shield member 4 with the outer surface of its annular rim 8 in engagement with the inner surface of rim 6 of shield member 4 and extending in the opposite direction to meet the bottom portion 5 thereof. As best shown in Figs. 1 and 4, the lower extremity 9 of rim 6 of shield member 4 may be rolled or pressed over the outer edge of the lead clip member 7 in order to secure the lead clip member and the shield member 4 in assembled relation.

A center opening 10 is formed in the bottom portion of the lead clip member 7 with a plurality of narrow bent inwardly into the cavity 15 defined by shield member 4 and lead clip member 7. The corona shield and lead clip assembly 4 is positioned over the terminal 2 with the terminal. extending through the opening 10, as best seen in Fig. 1, with the inwardly bent extremities 14 of fingers .13 serving to resiliently embrace terminal 2 thereby to secure the assembly thereto.

in order to attach the bared end 16 of a lead 17 to lead clip member 7, the end 16 is brought upwardly through an opening 12 in lead clip member 7 into the cavity 15 and an extremity 14 of a finger 13 is bent over the end 16, firmly securing it to the lead clip member 7, as at 18. This inwardly bending operation may be performed with a pair of long-nosed pliers. If it is desired that the end 16 of lead 17 be soldered to the lead clip member 7 after it is mechanically attached thereto, the end 16 can be pretinned and can therefore be soldered by merely applying heat. If more solder is required, it can be fed through the opening 12 adjacent the lead.

The corona shield and lead clip assembly shown in Figs. 1 to 4, inclusive, is provided with six fingers 13 thus permitting three alternate fingers to be used in securing the assembly to the terminal 2 and permitting attachment of three leads to the remaining fingers. Obviously, less than three leads may be attached and the idle fingers utilized to embrace terminal 2. If it is desirable to attach more than three leads, the number of fingers 13 may be correspondingly increased. Furthermore, it may not be necessary to utilize alternate fingers 13 to attach the assembly to the terminal 2 and only sufiicient fingers need be employed to provide the requisite degree of firmness of attachment.

Referring now to Fig. 5 in which like elements are indicated by like reference numerals, it is seen that the bottom portion 5 of shield member 4 is provided with an outwardly extending centrally disposed indentation 19 in which the end of terminal 2 is seated, thus providing a more rigid attachment of the corona shield and lead clip assembly 3 to the terminal 2.

While I have shown and described a particular embodiment of this invention, further modifications and improvements will occur to those skilled in the art. I desire that it be understood therefore that this invention is not limited to the particular forms shown and I intend in the appended claims to cover all modifications which do not depart from the spirit and scope of this invention.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. A corona shield and lead clip assembly for a terminal of a high voltage device comprising a cup-shaped corona shield member having a substantially dish-shaped bottom portion, said shield member being adapted to be positioned over said terminal, and a cup-shaped lead clip member arranged within said shield member with its rim in engagement with the rim of said shield member, said clip member having an opening formed in the center thereof with a plurality of slits extending radially out-- wardly therefrom defining a plurality of inwardly projecting fingers, some of said fingers being bent inwardly and being thereby adapted resiliently to embrace the outer peripheral surface of said terminal for securing said assembly thereto, the remainder of said fingers being adapted to be bent over thereby respectively to secure leads thereto.

2. A corona shield and lead clip assembly for the terminal of a high voltage device comprising a cup-shaped corona shield member having a substantially dish-shaped bottom portion, said shield member being adapted to be positioned over said terminal, and a cup-shaped lead clip member arranged within said shield member and defining a cavity therewith, said clip member having its rim in engagement with the rim of said shield member and extending in the opposite direction, the lower extremity of said shield member rim being turned inwardly over the outer extremity of the bottom portion of said clip member, said clip member having an opening formed in the center thereof with a plurality of slits extending radially outward therefrom defining a plurality of inwardly projecting fingers and respectively terminating in a plurality of openings of greater diameter than the width of said slits, some of said fingers having their inner extremities bent inwardly and being thereby adapted resiliently to embrace the outer peripheral surface of said terminal for securing said assembly thereto, the remainder of said fingers being adapted to be bent over in said cavity thereby respectively to secure leads thereto, said plurality of openings being adapted to accommodate said leads.

3. A corona shield and lead clip assembly for the terminal of a high voltage device comprising a cup-shaped corona shield member having a substantially dish-shaped bottom portion, said shield member bottom portion having a centrally disposed outwardly projecting indentation formed therein, said shield member being adapted to be positioned over said terminal with the end of said terminal being seated in said indentation, and a cup-shaped lead clip member arranged within said shield member and defining a cavity therewith, said clip member having its rim in engagement with the rim of said shield member and extending in the opposite direction, the lower extreinity of said shield member rim being turned inwardly over the outer extremity of the bottom portion of said clip member, said clip member having an opening formed in the center thereof with a plurality of slits extending radially outward therefrom defining a plurality of inwardly projecting fingers and respectively terminating in a plurality of openings of greater diameter than the width of said slits, some of said fingers having their inner extremities bent inwardly and being thereby adapted resiliently to embrace the outer peripheral surface of said terminal for securing said assembly thereto, the remainder of said fingers being adapted to be bent over in said cavity thereby respectively to secure leads thereto, said plurality of openings being adapted to accommodate said leads.

References Cited in the file of this patent UNITED STATES PATENTS l,9l4,l09 Cadieux June 13, 1933 1,959,442 Paulson May 22, 1934 2,434,572 Mankin Jan. 13, 1948 2,549,577 Coyle Apr. 17, 1951