US2787743A - Shell for deflection yoke - Google Patents

Description

April 2, 1957 A, P. HULTGREN 7 2,787,743

SHEILLFOR DEFLECTION YOKE Filed March 9, 1953 United States Patent SHELL FOR DEFLECTION YOKE Arnold P. Hultgren, River Forest, 111., assignor to American Molded Products Co., Chicago, 111., a corporation of Illinois Application March 9, 1953, Serial No. 341,289

2 Claims. (Cl. 317-200) This invention relates to a shell for a deflection yoke of the type adapted for use in television receiving apparatus. More particularly, the present invention is directed to certain improvements in a deflection yoke shell of the type disclosed in my United States Letters Patent No. 2,563,116 dated August 7, 1951. The shell of a deflection yoke, as disclosed in my patent, is formed at one end so as to provide an open-ended annular chamber for the reception of an electrical coil and the opposite end being formed 'to provide an external annular groove in which may be fixedly mounted suitable magnetic means, such as a plurality of arcuate permanent, magnet segments. The shell is composed of two substantially identical members of generally semicircular contour adapted to be firmly secured together as a unit. Each of the members comprising the shell are formed of thermo-plastic material which provide the various advantages as set forth in my aforesaid patent.

It is the constant desire of manufacturers of components of television receiving apparatus to reduce the size thereof to a practical minimum. Accordingly, it is desirable to reduce the overall length of a deflection yoke assembly which will permit reduction in overall length of the cathode ray tube and which further results in a reduction in size of cabinets employed to house the apparatus.

One of the objects of this invention is to provide an improved shell of the character indicated, having a barrier of electrical insulating material arranged between the electrical coil when mounted in the shell and a series of electrical terminal clips carried by the shell.

Another object of this invention is to provide an improved shell of the character indicated, having a barrier formed as an integral part of the molded shell member in a position for preventing arcing between the electrical coil when mounted in the shell and a series of'terminal clips carried on the shell.

Other objects and advantages of this invention will be apparent from the following description, taken in connection with the accompanying drawing in which:

Figure 1 is a side elevational view of the shell embodying the present invention,'with a portion of the cover broken away to show details of construction.

Figure 2 is an end elevational view looking at the righthand end of Figure 1.

Figure 3 is a vertical section through an assembled shell, taken substantially as indicated at line 3-3 on Figure 2.

Figure 4 is an end view of the shell with the cover removed and with portions broken away to show details of construction.

Figures 5 and 6 are enlarged sectional views taken as indicated at lines 55 and 6-6, respectively, on Figure 4.

Figure 7 is a rear end elevational view of the shell looking at the left-hand end of Figure 1.

Figure 8 is an enlarged sectional view at line 8-8 on Figure 7.

The shell for a deflection yoke, embodying the present "ice invention, is composed of two identical, generally semitubular members indicated at 10 and 11, adapted to be disposed in juxtaposed relation to form a generally tubular structure. When the two shell members are so assembled they form at one end thereof, an open-ended annular chamber 12 in which is adapted to be mounted an electrical coil (not shown) and the opposite end being formed to provide an external annular groove 14. As shown in Figure 1 of the drawing, the shell assembly is adapted to have mounted in the groove 14, suitable magnetic means such as in the form of permanent magnets in the nature of arcuate segments, as indicated in dot and dash outline at 15. The magnet segments are formed on their inner wall with a transverse groove constituting keyways for seating upon the ribs or keys, as indicated at 16, formed at the free edges of the respective shell members at the zone constituting the groove 14, so that the magnet segments tend to lock themselves in position with respect to the shell, and also tend to lock the shell members it and 11 together in assembled relation. The permanent magnet segments are adapted to be firmly held in clamped position in the groove in any conventional manner, such as a metallic strip, as indicated in dot and dash outline at 17.

Each of the shell members include a semi-annular wall 2%, and when the two shell members are assembled together said walls define the annular chamber 12. The inner end of said wall 2%) is connected to a semi-annular, radially extending wall 21, which constitutes a flange for the annular groove 14. The extreme opposite end of the members are formed with a semi-annular flange 22 which constitutes the outer flange for the annular groove 14. The abutting edges of the semi-annular flanges 22, of the two members, are provided with interengaging tongue and groove features 24 and 25 for insuring proper alignment and relative positioning of the two members 10 and 11 in assembled relation. To further insure proper alignment of the two members of the shell, the outer end of the annular walls 20 of the two members 10 and 11 are formed at one of their abutting edges with a recessed embossment 26 on each of the members, and the corresponding portion of the other member is formed with a nubbin 27 for seating in the recess of the embossment 26 and thus precluding lateral displacement of the two members of the shell in all directions except in a plane parallel to the connection of the nubbins.

The chambered end of the assembly of the two shell members is adapted to be enclosed by a flanged cover or cap, as indicated at 28, having a pair of diametrically opposite openings 28a in the flanges thereof for seating over outwardly extending nubbins 29 formed on the free edge of the wall portions 20 of the respective members adjacent the plane of connection of said members. The cover may be quickly and easily detachably mounted on the assembly of the shell members to further assist in confining the two shell members in proper assembled relation. The cover is provided with a central aperture, as indicated at 2311 for accommodating the neck of the cathode ray tube.

The two shell members 10 and 11, together with the cover member 28, are formed of a suitable thermoplastic material such as, for example, cellulose acetate. Shells formed of such material are relatively pliable and flexible and permit a substantial amount of distortion without rupture.

To avoid possible damage and distortion to the shell members in mounting of electrical terminal clips on the shell in a conventional manner, said clips are mounted so as to be in heat and electrical insulated relation to the shell members. For this purpose, I provide an assembly comprising a strip 30 of suitable insulating material having both heat and electrical insulating characteristics, on which is riveted, in spaced apart relation, a plurality of electrical terminal clips 31. The assembly of the strip and the clips is ri idly and firmly attached to the inner surface of the wall 2.0 of each of the shell members so that the terminal clips are positioned within the annular chamber 12 of the assembled shell in a conventional manner. The assembly of the strips and terminal clips is accomplished by providing apertures in the strips for fitting over projections 32 molded as an integral part of the shell members, and which projections are deformed as indicated at 32a to firmly secure the assembly of the strip and terminal clips rigidly in position. may be seen in the drawing, each of the terminals 31 is attached to the strip by means of a rivet 34, the outer end of which would normally contact the inner surface of the Wall 20 of the shell member. To prevent transmission of heat to the shell member during the soldering operation in connecting a conductor wire to a clip by transmission of heat through the rivet 3d, the wall 20 of the member is formed with a series of openings 35 in registration with each of the rivets 3-2 associated with the clips. Said openings are of a size so as to insure spaced relationship of the marginal edges of the openings with respect to the head of the rivet, as may be seen in the drawings. For economy and convenience, preferably the terminal clips 35 are riveted to the insulating strip 3% and the assembly is then secured in place in the shell member.

To avoid possible arcing between the electrical coil mounted within the chamber 12 and the terminal clip 31, i provide an electrical insulating barrier 38 in each of the shell members. The barrier is formed as an integral part or" ach of the shell members and is of arcuate segmental form and is of such circumferential extent as to extend beyond the terminal clips, as clearly seen in Figure 4 of the drawing.

The barrier 38 is each of the shell members is prefeiubly formed with an opening indicated at 39 registering with an aperture formed in the arcuate wall 29 of each shell member through which opening and aperture con ductor wires from the terminal clips may be conveniently trained cxteriorly of the shell assembly.

Although I have herein shown and described a preferred embodiment of my invention, manifestly it is capable of modification and rearrangement of parts without departing fro the spirit and scope thereof. I do not, therefore, wish to be understood as limiting this invention to the precise to rm herein disclosed, except as i may be so limited by the appended claims.

i claim as my invention:

1. In a deflection yoke shell comprising a pair of identical members providing wall portions of generally 50 semi-cylindrical form, adapted to be assembled in cooperative relation to form an open-ended annular chamber at one end for the reception of a coil, the exterior of the opposite end of said assembled members being formed to constitute a flanged annular groove for the reception of magnetic means therein; the improvement characterized by said members being formed of thermoplastic material, plurality of electrical terminal clips, means for securing aid clips to the chamber-defining wall portion of one of said members, in circumferentially spaced apart relation and in registration with said chamber, and an electrical insulating barrier carried by said one member adjacent the terminal clips within and extending transversely of the axis of the chamber, for preventing arcing between the coil and the terminal clips, said barrier being of arcuate segmental form and extending beyond said terminal clips in circumferential direction, said one member being provided with an aperture in the wall thereof, adjacent said terminal clips, and the barrier being formed With an opening in registration with said aperture, whereby conductor wires connected to said clips may be extended through said opening and aperture to the exterior of the shell.

2. In a deflection yoke shell comprising a pair of identical members providing wall portions of generally semieylindrical form, adapted to be assembled in cooperative relation to form an open-ended annular chamber at one end for the reception of a coil, the exterior of the opposite end of'said assembled members being formed to constitute a flanged annular groove for the reception of magnetic means therein; the improvement characterized by said members being molded of thermoplastic material in unitary form, a plurality of electrical terminal clips, means for securing said clips to the chamber-defining wall portion of one of said members, in circumferentially spaced apart relation and in registration with said chamber, andan integrally molded electrical insulating barrier provided by said one member adjacent the terminal clips within and extending transversely of the axis of the chamber, for preventing arcing between the coil and the terminal clips, said barrier being of arcuate segmental form and extending beyond said terminal clips in circumferential direction, said one member being provided with an aperture in the Wall thereof, adjacent said terminal clips, and the barrier being formed with an opening in registration with said aperture, whereby conductor Wires connected to said clips may be extended through said opening and aperture to the exterior of the shell.

References Cited in the file of this patent UNITED STATES PATENTS 1,517,770 Ziegler Dec. 2, 1924 1,784,833 Hagemann Dec. 16, 1930 2,563,116 Hultgren Aug. 7, 1951 FOREIGN PATENTS 51,628 Denmark May 11, 1936

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