US2897463A - Mounting structure for stationary inductive device - Google Patents

Description

y 28, 1959 w. L. DENHAM 2,897,463

MOUNTING STRUCTURE FOR STATIONARY INDUCTIVEZ DEVICE Filed Jan. 4. 1956 bye/71:02"; 144M827? L. Den/2am,

United States Patent MOUNTING STRUCTURE FOR STATIONARY INDUCT IVE DEVICE William L. Denham, Fort Wayne, Ind., assignor to General 'Electric Company, a corporation of New York Application January 4, 1956, Serial No. 557,272 9 Claims. (Cl. 336-65) This invention relates to stationary inductive apparatus, and more particularly to improved means for securing such apparatus to a base.

In order to secure stationary inductive apparatus to suitable bases, it has, in the past, generally been necessary to provide a considerable number of parts, many of which took considerable tooling and thus were quite expensive. One such arrangement which is representative and widely used is a bracket structure which is secured about the inductive device by threaded members and is then secured to the base member by either the same threaded members or additional such members. The bracket parts and the threaded members add considerably to the cost of the inductive device, particularly in the smaller categories. Accordingly, it is highly desirable to provide means for securing inductive devices to their bases which are simple, involve a minimum number of component parts, and require little or no tool work on the parts.

It is, therefore, an object of this invention to provide a fastening arrangement for stationary inductive apparatus which will be simple and have a minimum number of parts of simple configuration.

Further objects and advantages of this invention will become apparent and the invention will be better understood 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 one aspect thereof, the invention provides an inductive device which includes a substantially rectangular laminated core having a coil-receiving leg with a coil member positioned thereon. A mounting saddle member is arranged against a laminated face of the core substantially perpendicular to the leg, and fastening means are provided to secure the mounting saddle to the core and coil. These means include a metal strap which has a center portion extending parallel to the leg across a face of the core between the coil and the core; the end portions of the strap are bent substantially perpendicular to the first portion into engagement respectively with the saddle and with the face of the core opposite the saddle. In this manner, the strap acts to secure the core to the saddle. In addition, one end portion of the strap may be formed to lie flat across the'laminated face opposite the saddle so as to tend to clamp the laminations together. By means of this structure there is provided a base which may be secured within a casing, as shown in one embodiment of the invention, or which may be directly mounted to the desired support without any casing, as is shown in another form of the invention. The only additional members needed are the strap member or members, and the saddle. Each of these may be formed directly from sheet metal requiring no operation other than bending and cutting.

In the drawing,

Figure 1 is a view in perspective, partly broken away,

2,897,463v Patented July 28, 1959 of a first and preferred embodiment of the improved construction of this invention;

Figure 2 is a view in perspective of a second embodiment of the invention;

Figure 3 is a view in perspective of a first embodiment of the strap means of the invention;

Figure 4 is a view in perspective of a second embodiment of the strap means; and

Figure 5 is a view in perspective of yet another embodiment of the strap means.

Referring now to Figure 1, there is shown a transformer core, generally indicated at 1, made up in the usual manner of a stacked plurality of thin laminations of magnetic material. Core 1 has a substantially rectangular cross sectional configuration, with laminated sides 2 and 3, a laminated top section 4, a laminated bottom section 5, and a front 6 and a back 7. The core is formed with a pair of outer legs 8 and 9 and a center leg 10, with a coil 11 being positioned around the center leg 10 between the outer legs 8 and 9. The bottom laminated surface 5 of core member 1 is seated on the surface of a flat bight portion 12 of a U-shaped saddle member generally indicated at 13, the saddle member being formed of a strip of sheet metal. Saddle member 13 has side leg portions 14 and 15 bent down at substantially right angles to the top section 12 and fits snugly within a base member 16 so that portion 14 is adjacent side 17 of the base and portion 15 is adjacent side 18 of the base. Leg portions 14 and 15 may then be easily and swiftly secured to the base member 16 as, for instance, by spot welding as shown at 19.

A pair of strip metal strap members 20 are then passed down through the center opening 21 of coil 11 between the coil and faces 6 and 7 respectively of the core 1. Each strap 20 is passed down through the coil opening 21 until its bent over top portion 22 lies in firm abutment with the laminated surface 4 of the core 1. As shown at 23 the end of each top portion 22 is preferably formed on a bias so that the two strap members 20 between them are in abutment with every lamination across the width of surface 4. Referring now also to Figure 3, it will be observed that the other end of strap 20 is formed with a pair of tangs 24. After strap 20 has been positioned as explained above, each tang 24 is bent under top bight portion 12 of saddle 13. It will, of course, be understood that while tangs 24 have been shown, the purpose of this particular structure is to permit the end of the strap member 20 to be bent over with relative ease and that the particular provision of the tangs is not in itself a part of invention.

Once the end of each strap 20 has bent over so that it lies underneath top portion 12 of saddle member 13 in tight contact therewith, the core member 1 is firmly secured to the saddle member 12 which in turn is arranged so that it is easily mounted within and secured to base member 16. In addition, the laminations of which the core member 1 is formed are maintained together by the firm abutment of portions 22 of strap members 20. A wedging member 25, which may be formed of any suitable material such as fiber board, is preferably provided wedged between strap member 20 and coil 11 in order to provide further rigidity and to maintain the coil 11 thoroughly stationary on leg 10.

With the structure thus assembled, a cover member 26 may be provided which, together with base member 16, completely encloses the core member 1 and the coil 11. It is customary then to inject some type of encapsulating compound which fills the casing; however, this latter feature forms no part of the present invention and It will be seen from the foregoing that by providing three exceedingly simple and economically manufactured parts, the two straps 20 and the saddle member 1?, a core and coil may be secured together with the laminations maintained in rigid relationship and may be secured to a base which is suitable for mounting the induction device within a casing. It will further be seen that with the structure provided, the induction device may be mounted in an economical manner and without the necessity for a relatively large number of tooled parts as has previously been required.

Referring now to Figure 2 of the drawing, there will be described a second embodiment of the invention using like numerals for parts which are the same as in Figure l. The manner of securement of core 1 and coil 11 is the same as in the embodiment of Figure 1; thus, each strap 20 extends down between coil 11 and one of the faces 6 and 7 of the core and has tangs 24 bent under top portion 12 of saddle member 13 to maintain the assembly together in rigid relationship. However, in lieu of being arranged to be mounted in a casing as in Figure l, bent leg portions 14 and 15 are provided with flanges 27 and 28 respectively which are bent over substantially at right angles so that, in effect, they are substantially parallel to bight portion 12. Flanges 27 and 28 may then be provided with openings 29 so that the inductive device may be secured as desired. While the embodiment of Figure 2 has been shown with flanges 27 and 28 bent outwardly away from the device, it will, of course, be understood that they may just as easily be bent inwardly underneath portion 12 where such a construction is deemed desirable to save space and the decreased availability of openings 29 is not objectionable.

Referring now to Figure 4 of the drawing, there is shown a modified type of strap wherein, instead of being fiat as in the previous embodiments, the strap has a cross section which includes flat side portions 30 with a bowed center portion 31 joining them. While this does not in any way modify the action of the strap with respect to holding the core and coil to saddle member 12 or with respect to the effect of the coil in holding together laminations at surface 4, the bowed portion 31 will bear against the coil 11 when inserted in openings 21 so that the provision of an additional wedge 25, as in the embodiments of Figures 1 and 2, no longer becomes necessary.

Referring now to Figure 5, there is shown yet another modification of the strap member wherein, instead of two separate straps, a single member 32 is utilized. This member is substantially U-shaped, as shown, and has tangs 33 at each end corresponding to the tangs 24 of strap 20, and a bight portion 34 corresponding in position and function to portions 22 of straps 20. The manner of assembling the strap 32 to the core 1 and coil 11 is the same in every respect as-was true with respect to the individual straps 20.

It will be seen from the foregoing that each embodiment of this invention provides a simple method of securing a coil and core to a saddle member so that the complete inductive device may be simply, economically and easily mounted within a casing or to a base with no requirement for a relatively high number of relatively complex parts as has generally been true in the past.

While the invention has been explained by describing a particular embodiment thereof, it will be apparent that improvements and modifications may be made without departing from the scope of the invention as defined in the appended claims.

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

1. An inductive device comprising a substantially rectangular laminated core having a coil-receiving leg formed thereon; a coil member positioned on said leg; a mounting saddle arranged against a laminated side of said core substantially perpendicular to said leg and with its side edges generally parallel respectively with the opposite faces of said core; and fastening means comprising strap means having portions extending parallel to said leg respectively across opposite faces of said core between said coil and said core, and portions bent substantially perpendicular to said first-named portions into engagement respectively with the respective side edges of said saddle and with the laminated side of said core opposite said saddle thereby to secure said core to said saddle and to clamp the laminations of said core.

2. An inductive device comprising a substantially rectangular laminated core having a coil receiving leg formed thereon; a coil member positioned on said leg; a substantially U-shaped mounting saddle having a bight section arranged against a laminated side of said core substantially perpendicular to said leg and with its side edges generally parallel respectively with the opposite faces of said core; and fastening means comprising metal strap means having portions extending parallel to said leg respectively across opposite faces of said core between said coil and said core, and portions bent substantially perpendicular to said first-named portions into engagement respectively with the respective side edges of said bight section of said saddle and with the laminated side of said core opposite said saddle thereby to secure said core to said saddle and to clamp the laminations of said core.

3. An inductive device comprising a substantially rectangular laminated core having a coil-receiving leg formed thereon; a coil member positioned on said leg; a substantially U-shaped mounting saddle having a bight portion arranged against a laminated side of said core substantially perpendicular to said leg and with its side edges generally parallel respectively with the opposite faces of said core; fastening means comprising metal strap means having portions extending parallel to said leg respectively across opposite faces of said core between said coil and said core, and portions bent substantially perpendicular to said first-named portions into engagement respectively with the respective side edges of said saddle bight portion and with the laminated side of said core opposite said saddle thereby to secure said core to said saddle and to clamp the laminations of said core;

a base member having a pair of portions respectively adjacent the legs of said U-shaped saddle and secured thereto, and a cover member arranged in engagement with said base member to enclose said core, said coil, and said saddle member.

4. An inductive device comprising a substantially rectangular laminated core having a coil-receiving leg formed thereon; a coil member positioned on said leg; a substantially U-shaped saddle having a bight portion arranged against a laminated side of said core substantially perpendicular to said leg and with its side edges generally parallel respectively with theopposite faces of said core, said U-shaped saddle further having a pair of legs substantially at right angles to said bight portion, each of said legs terminating in a flange arranged substantially at right angles thereto and provided with openings for mounting purposes; and fastening means comprising metal strap means having portions extending parallel to said coil-receiving leg respectively across opposite faces of said core between said coil and said core, and portions bent substantially perpendicular to said firstnamed portions and into engagement with the respective side edges of said saddle bight portion and with the laminated side of said core opposite said saddle thereby to secure said core to said saddle and to clamp the laminations of said core.

5. An inductive device comprising a substantially rectangular laminated core having a coil-receiving leg formed thereon; a coil member positioned on said leg; a mounting saddle arranged against a laminated side of said core substantially perpendicular to said leg and with its side edges generally parallel respectively with the opposite faces of said core; and fastening means comprising a pair of metal straps respectively having center portions extending parallel to said leg across opposite faces of said core between said coil and said core, and respectively having two end portions bent substantially perpendicular to said center portions into engagement with the respective side edges of said saddle and with the laminated side of said core opposite said saddle thereby to secure said core to said saddle and to clamp the laminations of said core.

6. An inductive device comprising a substantially rectangular laminated core having a coil-receiving leg formed thereon; a coil member positioned on said leg; a mounting saddle arranged against a laminated side of said core substantially perpendicular to said leg and with its side edges generally parallel respectively with the opposite faces of said core; and fastening means comprising a pair of metal straps respectively having center portions extending parallel to said leg across opposite faces of said core between said coil and said core, and respectively having first and second end portions bent substantially perpendicular to said center portion into engagement respectively with the respective side edges of said saddle and with the laminated side of said core opposite said saddle thereby to secure said core to said saddle and to clamp the laminations of said core, said second end portions having their ends formed on a bias and being so positioned relative to each other that the entire width of said face opposite said saddle is engaged by one of said end portions.

7. An inductive device comprising a substantially rectangular laminated core having a coil-receiving leg formed thereon; a coil member positioned on said leg; a mounting saddle arranged against a laminated side of said core substantially perpendicular to said leg and with its side edges generally parallel respectively with the opposite faces of said core; and fastening means comprising metal strap means having a cross-section with fiat edges joined by a bowed portion, said strap means having portions extending parallel to said leg respectively across opposite faces of said core between said coil and said core and having portions bent substantially perpendicular to said first-named portions into engagement respectively with the respective side edges of said saddle and with the laminated side of said core opposite said saddle, thereby to secure said core to said saddle and to clamp the laminations of said core, said bowed portion of said 6 strap means extending into engagement with said co thereby to act as a wedge.

8. An inductive device comprising a substantially rectangular laminated core having a coil-receiving leg formed thereon; a coil member positioned on said leg; a mounting saddle arranged against a laminated side of said core substantially perpendicular to said leg and with its side edges generally parallel respectively with the opposite faces of said core; and fastening means comprising a U-shaped metal strap having a bight portion extending across the laminated side of said core opposite said saddle, a pair of leg portions respectively extending parallel to said coil-receiving leg across opposite faces of said core between said coil and said core, and portions at the ends of said leg portions respectively arranged substantially perpendicular thereto in engagement with the respective side edges of said saddle thereby to secure said core to said saddle and to clamp the laminations of said core.

9. An inductive device comprising a substantially rectangular laminated core having a coil-receiving leg formed thereon; a coil member positioned on said leg; a substantially U-shaped mounting saddle having a bight portion arranged against a laminated side of said core substantially perpendicular to said leg and with its side edges generally parallel respectively with the opposite faces of said core; fastening means comprising metal strap means having portions extending parallel to said leg respectively across opposite faces of said core between said coil and said core, and portions bent substantially perpendicular to said first-named portions into engagement respectively with the respective side edges of said saddle bight portion and with the laminated side of said core opposite said saddle thereby to secure said core to said saddle and to clamp laminations of said core; a base member having a bottom portion and a peripheral flange portion; the legs of said U-shaped saddle being respectively secured to the inner surfaces of opposite sides of said flange member portion; and a cover member engaging said base mem ber flange portion and enclosing said core, said coil, and said saddle member.

References Cited in the file of this patent UNITED STATES PATENTS 1,133,316 Pikler Mar. 30, 1915 2,351,377 Warsher June 13, 1944 2,431,867 Galla Dec. 2, 1947 2,459,023 Gillman Jan. 11, 1949 2,561,855 Gould July 24, 1951

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