US3341805A - High voltage tube socket - Google Patents

Description

Sept. 12,1967

Filed May 27, 1965 Z5 2d I 2 im w WM 4&MM,%W.;%W ,%7MATTORNEYS United States Patent 3,341,805 HIGH VOLTAGE TUBE SOCKET Albert P. De Vito, Niles, lll., assignor to Alcon Metal Products, Inc., Chicago, 111., a corporation of Delaware Filed May 27, 1965, Ser. No. 459,293 8 Claims. (Cl. 339-111) ABSTRACT OF THE DISCLOSURE An electrical tube socket has a body provided with a plurality of tube pin receiving holes opening through one face and within which are pin terminals connected to electrical leads received in recesses in the opposite face, one of the leads being for high voltage and its recess having thereabout a horseshoe-shaped barrier wall with its ends projecting as interlock shoulder extensions beyond an edge of the body. A cover plate is secured in closing relation to the recesses and has a slot therethrough complementary to and clearing the barrier wall, with parts of the cover plate adjacent the ends of the slot interlockingly engaged under the extension.

This invention relates to improvements in tube sockets and more particularly sockets especially adapted to include a high voltage terminal such as are useful in connecting the picture tubes in miniaturized TV sets.

- A major problem encountered in tube sockets involving high voltage leads and receptacles resides in the liability to crossover or arcing, sometimes loosely referred to as sparking, of the high potential to adjacent leads or receptacles or other conductive objects or surfaces.

Accordingly, it is an important object of the present 7 invention to provide new and improved means for guarding against arcing from an electrical socket structure.

Another object of the invention is to provide a novel arrangement in a TV picture tube socket for guarding against high potential crossover or arcing.

A further object of the invention is to provide new and improved interlock means for the electrical lead cover of a picture tube socket for miniaturized TV sets.

Still another object of the invention is to provide improved means for preventing arcing from high potential leads, terminals, receptacles and the like in electrical circuitry.

Other objects. features and advantages of the present invention will be readily apparent from the following detailed description of a preferred embodiment thereof taken in conjunction with the accompanying drawings, in which:

FIGURE 1 is a top plan view of a socket body embodying features of the invention;

FIGURE 2 is a bottom plan view of the socket body, showing certain of the electrical leads and attached terminals in position;

FIGURE 3 is a plan view of the back plate or cover for the socket assembly;

FIGURE 4 is a back plan view of the completed socket assembly;

FIGURE 5 is a sectional detail view taken substantially on the line VV of FIGURE 4; and

FIGURE 6 is a longitudinal sectional elevational view of the high voltage lead and its attached terminal and pin receptacle.

In the illustrated representative practical embodiment of the invention, a socket body 10 made of a suitable dielectric material molded to form is of a disk-like form and of generally circular outline having a front face smaller diameter tube mount platform boss 11 with an annular series of tube terminal pin receiving socket holes 12 therethrough about a central keyhole 13. Numerical Patented Sept. 12, 1967 indicia 14 on the front face of the lateral flange portion of the body 10 about the tube mounting base boss 11 identify the respective pin holes 12. One such pin hole 12a is designated for reception of the high voltage tube terminal pin and that portion of the boss 11 having such pin hole is isolated from the adjacent and remaining portion of the boss by radial slots 15 providing air gaps.

On its back-face, the socket body 10 is provided with electrical terminal-receiving and interlock means comprising respective terminal recesses which are radially elongated and extend from the pin-receiving holes 12 radially outwardly to the base of a generally annular axially extending rim flange 18 on the margin of the body through which smaller width lead clearance grooves 19 are aligned with the respective terminal recesses. These recesses 17 and the aligned grooves 19 are provided for all of the pin holes except the pin hole 12a receptive of the high voltage tube pin which has aligned therewith radial terminal recess 17a and an aligned lead-clearance groove 19a formed in a radial lip flange extension 20 of the body 10. This affords support for a high voltage barrier wall 21 of generally horseshoe shape extending in substantially raised relation from the ear 20 about the high voltage pin hole 12a and the aligned recess 17a and groove 19a.

Receptive in the recesses 17 are terminals 22 which are formed integrally with tubular pin receptacles 23 received within the respective pin socket holes 12. Attached to the terminals 22 are respective electrical lead wires 24 extending through the grooves 19. Within the high voltage pin socket hole 12a is received a tubular pin receptacle 25 integral with a terminal 27 attached to a high voltage lead wire 28. It will be observed that in respect to the terminals 22, the inner opposing surface of the axial flange 18 serves as a retainer against radially outward displacement of the terminal. Similarly, the high voltage terminal 27 is retained against radially outward displacement by a shoulder 29 at juncture of the inner end of the groove 19a with the recess 17a.

Means for locking the terminals and attached leads in their socket recesses against axial displacement and in eflicient electrical isolation from one another comprise a backplate cover 30 which is a dielectric panel of suitable thickness having its outer perimeter complementary to the inner perimeter defined by the flange 18 and with a lip flange extension 31 which is complementary in width to the lip flange 20 of the socket body. In assembly, the cover panel 30 lies flat against the back-face of the body 10 and the ear 31 flat against the body ear 20 and with a keyhole aperture 32 registering with the body keyhole aperture 13 while a generally horseshoe shaped aperture 33 complementary to the barrier 21 clears the barrier therethrough.

Means are provided for securing the cover plate 30 in close face-to-face engagement with the opposing face of the body 10 and the ear 20. Attaching screws must be located as far as practicable away from the high voltage lead 28. Therefore, in the area adjacent to the barrier 21 a problem has heretofore existed in maintaining the cover plate close to the surface of the ear 20 and thus in electrically isolating covering relation to the high voltage terminal. According to the present invention, this problem is advantageously overcome by affording a holddown interlock relationship between the barrier 21 and the cover ear 31, comprising extending the leg portions of the barrier 21 as interlock extensions 34 which project beyond the outer end of the body ear 20 and afford respective forwardly facing interlock shoulders 35 spaced from the plane of the back-face surface of the ear 20 about the same distance as the thickness of the cover plate 30 and more particularly the ear portion 31 thereof. Engaging under the hold-down shoulders 35 is a terminal 3 bar structure 37 on the lip 31 extending across the outer ends of the clearance aperture 33.

In assembling the closure plate 30 with the socket body, the interlock shoulder extensions 34 are received through the leg portions of the clearance slot 33 while the cover plate is tilted up relative to the body ear 20, substantially as shown in dot-dash outline in FIGURE 5. Thereby, the interlock terminal bar 37 is brought into assembled relation to the shoulders 35. Then the cover plate 30 is swung relative to the body into the fiat faceto-face interengagement. To facilitate swinging movement of a tongue portion 38 of the lip flange 31, defining the bight of the clearance slot 33, into the bight of the bifurcation defined by the barrier Wall 21, the leg portions of the barrier Wall and of the clearance slot are desirably substantially parallel. Further, the outer side of the barrier wall is provided with a taper 39 from top to about the plane of the interlock shoulders 35 sufficient to clear the edges defining the outer side of the clearance slot 33 past the barrier wall during the relative swinging assembly maneuver. As a result, a fairly close fitting relationship of the cover tongue 31 with the base portions of the barrier wall 21 is attained and since the cover plate lip 31 is positively held through interengagement of the shoulders 35 and the interlock bar 37 against tilting-up due to warpage or any other reason from the surface of the body lip 20, a thorough electrical isolation of the high voltage terminal 27 is maintained.

Attachment of the closure panel 30 against displacement from within the flange 18 of the socket body is effected by means of eyelet rivets 40 or the like extending through complementary attachment cars 41 on the body and 42 on the closure panel. Through this arrangement, no metallic fasteners are Within crossover or arcing range of the high voltage terminal 27. By the efiicient, balanced, spaced four point hold-down of the cover panel 30 avoidance is attained of any gap between the body 10 and the cover 30 through which crossover or arcing may occur.

Additional, or even principal protection against crossover or arcing from the high voltage terminal 27 may be afforded by a highly dielectric coating 43 applied and bonded to the terminal 27, the receptacle 25 and the terminal end portion of the high voltage lead 28 from which the normal insulation 44 of the wire has been stripped. The dielectric coating 43 covers all of the terminal 27 inclusive of the ferrule portion thereof which embraces the insulation 44 adjacent to the stripped terminal area and the embraced insulation 44. This dielectric insulating coating 43 comprises any suitable plastic material which has a high enough melting point and dielectric strength. For example, in the TV tube socket herein, the coating 43 is desirably possessed of a material which has a melting point of from 277 to 282 F. and free from cold flow at 265 F. A material suitable for this purpose is obtainable commercially under the name Dag from Biwax Corporation, Skokie, Illinois.

After the terminal 27 has been applied to the lead wire 28, the terminal and lead wire assembly is coated as by dipping into the coating material in liquid state, and which for this purpose may have a dipping temperature of 290 to 330 F. The entire terminal, inclusive of the receptacle 25, is thus uniformly dielectrically covered. Any of the dielectric coating that may lodge on the inside of the receptacle 25 is dislodged, especially in the gripping throat area thereof by the terminal pin of the tube when thrust thereinto, so that metal-to-metal contact of the pin in the receptacle is attained.

It will be understood that modifications and variations may be effected without departing from the scope of the novel concepts of the present invention.

I claim as my invention:

1. In a tube socket assembly of the character described including a dielectric body having electrical terminalreceiving recesses in one face and a dielectric cover plate for said face:

said body having an electrically isolating area lip por tion in which one of said recesses is receptive of a high voltage terminal and including a generally horseshoe-shaped barrier wall isolating the high voltage terminal recess from the remaining terminal recesses;

a lip on said cover plate having a horseshoe-shaped slot complementary to said barrier wall; and extensions on said barrier wall projecting beyond the body edge and receiving thereunder parts of said cover plate lip adjacent the end of said slot and locking the lips against separation and substantially eliminating any gap therebetween.

2. A socket construction especially suitable for effecting electrical connection of a miniaturized TV tube and including a body having a tube mount portion providing a plurality of tube terminal pin holes opening from one face of the body and receptive of electrical terminal receptacles from the other face of the body and which other face has terminal-receiving recesses therein aligned with said pin holes with one of said pin holes and its aligned recess isolated from the others by a barrier wall of generally horseshoe shape:

interlock extensions on said barrier wall projecting beyond an edge of said body; and

a cover member engaged over said recesses and having a complementary slot therein receptive of said barrier wall with interlock structure at the ends of said slot engaging said interlock extensions.

3. A socket structure as defined in claim 2 in which said barrier wall has substantially parallel legs from which said extensions project, and the slot in said cover defines a tongue engaging Within the bight of said barrier wall, said barrier wall having its outer side tapered from its crown toward its base to afford clearance for assembly of said cover with the body by engaging said interlock projections through said slot and then swinging the cover member into engagement with the body.

4. A socket as defined in claim 2 in which means are provided at two points spaced from each other and from said interlock extensions for securing the cover onto the body.

5. An electrical socket assembly comprising:

a body having a plurality of tube terminal pin receiving holes opening from one face of the body and respective terminal recesses in the opposite face of the body aligned with said holes;

respective pin terminals in said holes and having integral electrical terminals in said recesses attached to electrical leads extending from the socket;

an isolating barrier wall on and projecting from said opposite face about one of said holes and its recess to accommodate a high voltage lead;

a cover plate over said opposite face of said body closing all of said recesses and locking said terminals and the leads in place; and

means securing said plate to the body including interlock shoulder means on said barrier wall spaced from the plane of said opposite face approximately the thickness of said plate and engaging against a confronting portion of the plate and holding the plate in close engagement with said opposite face to avoid crossover or arcing gap between the plate and said opposite face about said high voltage terminal.

6. An assembly as defined in claim 5, in which said plate has an opening therein substantially complementary to and receptive of said wall therethrough, said shoulder means comprising a projection of said wall beyond an edge of said body, said plate having a portion thereof engageable under said shoulder projection and being adapted to be assembled therewith by initially canting the plate relative to said opposite face with said wall partially engaged through said opening and with said plate portion under said projection, whereafter the plate is moved into a face-to-face engagement with said opposite face with said portion interlockingly engaged under said projection, and means spaced from said wall securing said plate against displacement from said opposite face.

7. In an electrical socket:

a body having a plurality of tube terminal pin receiving holes opening from one face of the body and respective terminal recesses in the opposite face of the body aligned with said holes;

respective pin terminals in said holes and having integral electrical terminals in said recesses attached to electrical leads extending from the socket; and

an isolating barrier wall on and projecting from said opposite face about one of said holes and its recess to accommodate a high voltage lead and having interlock shoulder means thereon spaced from the plane of said opposite face approximately the thickness of to cover plate apertured to receive said barrier wall,

References Cited UNITED STATES PATENTS 2,383,973 9/1945 Jones 339111 X 2,443,513 6/ 1948 Quackenbush 339-218 X 2,923,912 2/1960 Benander 339-210 X 3,227,910 1/1966 Pittman 339-193 X 3,251,016 5/1966 Manetti et al 339-111 X 3,278,886 10/1966 Blurnenberg et al. 339-111 X MARVIN A. CHAMPION, Primary Examiner. RICHARD E. MOORE, Examiner.

Claims (1)

1. 7. IN AN ELECTRICAL SOCKET: A B ODY HAVING A PLURALITY OF TUBE TERMINAL PIN RECEIVING HOLES OPENING FROM ONE FACE OF THE BODY AND RESPECTIVE TERMINAL RECESSES IN THE OPPOSITE FACE OF THE BODY ALIGNED WITH SAID HOLES; RESPECTIVE PIN TERMINALS IN SAID HOLES AND HAVING INTEGRAL ELECTRICAL TERMINALS IN SAID RECESSES ATTACHED TO ELECTRICAL LEADS EXTENDING FROM THE SOCKET; AND

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