US2931930A - Field coil retaining means - Google Patents

Description

April 5, 1960 H. F. HANSCOM 2,931,930

FIELD COIL RETAINING MEANS Filed Dec. 15, 1955 INVEN TOR. Haw/22's fi? Han s 0 am ga/WW ATTORNEYS.

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FIELD COIL RETAINING MEANS Harris F. Hanscom, Ban'ington, R.I., asslgnor to H. F. gilnsgom & Company, Inc., a corporation of Rhode an Application December 15, 1955, Serial No. 553,274

2 Claims. (Cl. 310-194) duced with a double lap of insulation on one side thereof.

' Another object of the invention is to provide a clip that may be readily deformed and yet remain in position once deformed under reasonable stresses.

A still further object of the invention is to provide a clip which is particularly adapted for holding field coils in place in fractional horsepower electric motors.

With these and other objects in view, the invention consists of certain novel features of construction as will be more fully described and particularly pointed out in the appended claims.

In the drawing:

Figure l is an end view of the field structure in a small electric motor, showing the clip applied to the field coils;

Figure2 is a cross sectional view taken on line 2-2 of Figure 1, showing the manner in which the clip holds the coil to the field structure;

Figure 3 is a perspective view of the clip as produced in finished form;

Figure 4 is a cross sectional view taken on line 4--4 of Figure 3;

Figure 5 is a perspective view illustrative of the method of manufacturing the clip in linear form;

Figure 6 is a cross sectional view showing the clip used to hold a wire to an insulating plate.

In proceeding with this invention, I preferably take a strip of steel stock of generally rectangular configuration and pass this stock through a covering machine which automatically folds insulating material around the stock in a manner so that two layers thereof will be formed at one of the sides thereof. In a subsequent operation I cut the strip into suitable lengths for further utilization and form it to a proper size and shape in accordance with the particular application to which it will be put.

Referring to the drawings, I show in Figure 5 a strip of stock which has heretofore been referred to as steel but which may be formed from other materials so long as it meets the prime requisites of having a sufficient stiffness to take a permanent set upon deformation and a sufficient ductility to withstand bending. It will be noted that this strip 10 is encased on all sides with an insulating material such as treated paper stock generally designated 11 and which is made up of a base portion 12 and two fiaps13 and 14. It will be noted that one flap, in this case 13, has been folded down on the top of the strip, after which the second flap 14 is folded thereover as designated by the arrow A. This condition can be met on a continuous forming machine which is not the subject of this application and thus produced in strip form. The finished product is shown in cross section in Figure 4 wherein it will be noted that the strip 10 is encased on Patented Apr. 5, 1960 one side with the layer 12 and on the opposite side with layers 13 and 14.

For an application as a field coil strip it is preferably formed to a generally U-shaped configuration, as shown in Figure 3, there being two legs of the U evenly spaced throughout the extent. Referring now to Figure 2, I have shown therein in cross section a portion of the field pole 16 which is of generally circular configuration, as seen in Figure 1. At spaced locations of this field pole there is provided a projection 17 around which the field winding is adapted to be placed. In order to hold the field coil in place, the clip as shown in Figure 2 may have its legs spaced adjacent the sides 18 of the pole 16, at which point they will lie along the sides 18 and considerably ,below the actual field winding 19. The legs 15 of the clip may then be bent upwardly and around the field winding 19 to the position as shown in Figure 2 and thus hold the field winding tightly against the pole 16. It will be noted that the clip is formed so that the double insulation is present adjacent the field winding 19 to provide added insulation at this point between the pole piece and the winding itself.

It will be apparent, of course, that the clip may be made in other forms, such as shown in Figure 6, wherein I have shown a clip of a generally arched character that may be passed through suitable apertures in an insulating plate 21 and then have its legs bent against the reverse side of the insulating plate 21 as at 22 to hold a cable such as 23 in place against the plate. Other uses will, of course, occur to those skilled in the art.

I claim:

1. Electric conductor supporting and retaining means comprising a metallic core, said core being rectangular in cross-section and incasedin a treated paper insulation folded around said core so as to present two layers at one side thereof and a single layer on the other side, said core being U-shape having parallel legs with an interconnecting bridge, said core being ductile whereby the legs thereof may be bent about a support to be secured thereto and be bent about an electric conductor to be secured to said support, the two layer insulations abutting said conductor, said core being sufiiciently stiff to take a permanent set so as to be self-retained in said bent relation against said support and said electric conductor.

2. In combination with a field magnet for an electric motor or the like, said magnet having a general cylindrical form with internal projections, field coil windings disposed in partial embracing relation with said field magnet about said projections opposite sides thereof extending at least partially outward of the cylindrical form of said field magnet, an insulating fastener for holding and securing said field coil to said field magnet comprising a metallic core encased in a treated paper insulation folded around said core so as to present two layers at one side thereof and a single layer on the other side, said core being U-shaped and having parallel legs with an interconnecting bridge, said bridge being engaged against the outer portion of said field magnet with said legs extending inwardly in the space between the ends of said magnet and said field coil and with the said two layers being posi tioned next to said field coil, said fastener being ductile, each of said legs being bent in a reversed direction about said field coil to hold the same against said magnet, the ends of said fastener being in proximity to the bridge thereof, said fastener being sufficiently stifi to take a permanent set and remain engaged against said field magnet and said field coil.

(References on following page) 1 v 3 Refe'ren'cs Cited in the file of this patent 1,922,258 Packer Aug. 15, 1933 2,237,999 Apt-{3, 1941 5 66,588 2,400,008 Korte May 7, 1946 128;431 2,465,820 Shartowt-l. Mar. 29, 1949 Rubles Oct. 24, 1950 Linke Nov. 13, 1951 FOREIGN PATENTS Switzerland Sept. 27, 1913 Great Britain June 26, 1919

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