US2198437A - Coil and condenser assembly for high frequency purposes - Google Patents

Description

April 23, 1940. KAUFMAN 2.198.437

COIL AND CONDENSER ASSEMBLY FOR HIGH FREQUENCY PURPOSES Filed Feb. 4, 1938 Fig.3.

ATTO/WVEY Patented Apr. 23, 1940 UNITED STATES PATENT OFFICE- Albert Kaufman, Paris, France Application February 4, 1938, Serial No. 188,610

. "In Great Britain February 8, 1937 2 Claims.

The present invention relates to coil and/or condenser assemblies for high frequency purposes.

It is an object of the present invention to provide means for easily and securely mounting a coil and/or condenser on a mount.

It is a further object of the invention to avoid, to a great extent, metal parts in order to keep the electro-magnetic losses small.

It is another object of the invention to provide a coil having a magnetic core, the inductivity of the coil being adjustable.

Other objects of the invention will be apparent from the description as it proceeds.

In order that the invention may be more clearly understood some embodiments thereof are described hereinafter with reference to the accompanying drawing in which:

Figs. 1 and 2 illustrate two embodiments of the invention, and

Fig. 3 illustrates a detail of the embodiment illustrated in Fig. 1.

Fig. 1 illustrates an embodiment for fixing a coil in a mounting plate and illustrates also a coil the inductivity of which can easily be adjusted. The core of the coil, which may comprise finelydivided magnetic material, consists of two parts 4| and 42. The part 4| is rigidly mounted in a casing 43 the upper part 44 of which is provided with internal screw-threading. The part 42 of the core is rigidly connected to a member 45 provided with external screw-threading engaging the internal screw-threading of part 44 of the casing 43. In the embodiment shown the coil has three windings 46, 46', 46" provided on the casing 43. When the member 45 is screwed into the casing as illustrated in Fig. l the two parts 4| and 42 meet within the winding space (indicated by I in Fig. l) of the coil, at about the middle of the said space, i. e. the middle of winding 45'. By rotating the member 45 relatively to the casing 43 in one or the other direction the parts 42 and 4| of the .core can be brought nearer together or moved away from each other respectively. Thus the inductivity of the coil can easily be adjusted. Since both parts 4| and 42 meet each other within the winding space the alteration of the coeiiicient of efilciency current with which the coil is tested) of the coil 55 is altered to a small degree only. It has been found that, for example, this coeflicient is altered by only 5% when the inductivity is altered by 15%. One or two windings only or more than three windings may be provided on the iron core, but in all cases, it is essential that the two parts of the core meet within the winding space.

As illustrated, the upper part 44 of the casing 43 may be provided with a flange 41, having two openings 48 through which undercut extensions 49 of a mounting-plate 50 extend when the coil is inserted in the opening 5| of the plate 50. A clamping or spring ring 52, preferably made of insulating material and having a slot 53 (see Fig. 3) may be pressed on to the upper part 44 so that it engages the undercut sides of the extensions 49 and thus secures the coil in its position. The casing 43 may have a slot at its bottom 43' into which the edge 43" of the opening of the mounting plate 50 may engage, to secure rigidly the lower part of the coil.

In a similar manner, a condenser, e. g. a trimming condenser, may be mounted on a plate as illustrated in Fig. 2. In Fig. 2, 60 is a trimming condenser as known per se. BI is a mount plate having an opening 62 and projections 63 which may pass through corresponding openings in a plate 64 covering the condenser 60. The projections are undercut as illustrated and a clamping ring 52, having a slot 53 (see Fig. 3) can be pressed on the plate 64 between the extensions 63 whereby the condenser is secured to the mounting plate 6|.

With the arrangement described, unnecessary metallic parts are avoided by the extensive use of insulating material for mounting. It will easily be appreciated that, if several windings on one coil or several coils are used they may act as a high frequency transformer.

I claim:

1. A coil assembly for high frequency equipment, comprising a mount plate of insulating material having an opening therein extending from an edge thereof into the body of said plate, said plate being formed with a pair of undercut projections lying in the plane of said plate and extending one on each side of said opening, a high frequency coil arranged axially in said opening, and having at its end nearest said edge abutment means apertured to pass over said projections so that the latter project therethrough and engaging said edge of said mount plate, and a removable resilient ring of insulating material of larger diameter than the distance between the ends of said projections and yieldably pressed into interlocking engagement with the undercut said edge abutment means apertured to pass over said projections so that the latter project therethrough and engaging said edge of said mount plate, a'nda removable resilient ring of insulating material of larger diameter than the distance between the ends of said projections and yieldably pressed into interlocking engagement with the undercut portions of said projections to thereby retain said component in position in said mount plate.

AIBERT KAUFMAN.

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