Patent GB-229239-A (GB)
Title: Improvements in electrical condensers
IPC: H01G4/30
Filed: 1924-05-28
Abstract: 229,239. Dubilier, W. Feb. 14, 1924, [Convention date]. Composite units.-A stack of interleaved conducting and dielectric elements is secured to a substantially rigid insulating base-plate by means of a clamping strip having its ends bent around the edges of the stack. In one construction, Figs. 2 and 4, the stack of elements 1 is clamped between the mounting plate 2, having triangular extensions 6, and a top cover plate 3, a curved spring plate 4, Fig. 13, being placed between the cover plate and the top of the stack. The body of the condenser is gripped by a band clamp 5 which extends across the cover plate 3 and has its ends bent over to grip the outside faces of the plate 2. Clips 7, which serve as terminal members, are secured to each of the extensions 6 of the plate 2 by means of eyelet rivets 8, and are provided with extensions 18 gripping the top of the cover plate 3. In a modification, Fig. 16, the band clamp 5 is dispensed with, and parallel cuts are made in opposite ends of the spring plate 4, so that the ends can be turned over, as shown at 31, 32, to grip the outer surfaces of the plates 2, 3. The clips 7 may be formed with extensions 33, as shown in Fig. 18, so that a detachable resistance 36, such as a grid leak, may be mounted in parallel with the condenser. In another construction, Fig. 21, the base plate 2 is provided with a single extension 6<a> carrying a U-shaped clip 37 to which the conducting sheets of one polarity are connected. The remaining conducting sheets are formed with tabs or projections which are turned over the base plate or cover plate 3 to lie under the clamping band 5, which is formed with a terminal extension 46. Blocks 48, Fig. 23, carrying spring terminals 49 for a grid leak may be secured to t,he terminals of the condenser. By passing the eyelet rivet 8, which secures the clip 37 to the extension 6a, through the base 50 of the terminal 49, the grid leak will be placed in parallel with the condenser. If a grid leak in series with the condenser is desired, the block 48 is reversed, and secured to the extension 6<a> by a fastening device passing through the hole 51. In this construction, the clip 37 may be omitted and the securing means for the block may be used as fastening means for one set of condenser ele.- ments. In another construction, Fig. 27, extensions 6<a> and U-shaped clips 38 are provided at both ends of the base plate 2, the terminal on the clamping member 5 being omitted. In another construction. Fig. 29, the cover plate and the terminal clips are omitted, the condenser stack 1 being secured to the base plate by the clamping band 5, while the two sets nf conducting sheets are secured to eyelet rivets 8 on the extensions 6. The Specification as open to inspection under Sect. 91 (3) (a) comprises also the construction shown in Figs. 19 (Cancelled) and 20 (Cancelled) with a base plate 2 formed with a single extension 6, to which a clip 37 is riveted by an eyelet 8. Two additional U-shaped clips 38, 39 embrace two plates 2, 3 with the condenser stack 1, and are secured in position by eyelets 8. The condenser stack comprises three sets or groups 40, 41, 42 of tin foil sheets separated by dielectric sheets. The sheets 40 are provided with projections 43 contacting with the clip 37, and the sheets 41, 42 are respectively in engagement with the rivets 8 of the clips 38, 39. By using different pairs of clips as terminals, three different working capacities can be obtained. This subject-matter does not appear in the Specification as accepted.