Socket connection for radio tubes
United States Patent 2439589

This invention relates to socket connections for radio tubes, and more particularly to such a device in which an electrical connection means other than prongs and spring metal clips is provied. 5... 'Spring metal clips, movable in suitable openings in sockets of electrical connections are cormon...

Sundell, Carl H.
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Sundell, Carl H.
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US Patent References:
2200332Socket for vacuum tubes1940-05-14
1792973Electrical socket1931-02-17

Foreign References:

This invention relates to socket connections for radio tubes, and more particularly to such a device in which an electrical connection means other than prongs and spring metal clips is provied. 5... 'Spring metal clips, movable in suitable openings in sockets of electrical connections are cormon but they and the sockets have:inherent defects. The clips are subject to breakage during insertion and withdrawal of the prongs, are apt to-become-worn and result'in poor electrical conductors, due to oxidation of the worn surfaces, and may become rusted and cause adhesion' of the prongs' to the clipS. The sockets, housing such':clips, must, of necessity, have openings to the-surface for insertion of the prongs, and these openings are apt to collect dust, rosin, metallic particles and the like. Conventional sockets reqtiitethat a suitable base be attached to the glass envelope; and' this entails an added expense in g0 6 thee bcostruction of the tubes. : --An important object of this invention is to provide a radio or like tube socket, free' of clips, springs or similar movable parts.

Another important object is to provide a socket of this kind, having no permanent openings to the surface thereof from the electrical conducting metal within the socket. 'Still another important object is to provide a socket of the class described, requiring no associated base added to the tube envelope.

In addition, an important object is to provide such Wsocket which will'function as a shock absorber, even when the glass envelope itself comprises the tube base andthis base contacts the sof et. leads, . mdenitn.n ao e of athe indiidual pi r pr .nection ..of.the socketfo.r.anothe . iead of discardin the entire socket and such replacement 40 of imay be made without distubing any of te other indiviiUal pin or prong connections of the socket, tl notherbje ntas o f ide suca socket, w i 'appairesult in thereduction of the length ofte interir leads, so that inductance will be 45 or the like. cut down, an important advantage' in some tYpes of radio operation.

y et another object'is to provide a radio tube socket which nctions, in part, as a cleaner of th'rongs or pins as they are inserted in socket, whereby dust, grease, oxide film or the ik be "removleyd in he act of inserting the sr,!or prongs. "The :tr ojects and advantages of this inention ~be, a,~pparent lu g tht Iokse te following detailed description of the invention, taken in cqnnection with the accompanying drwing, forming a part of this specification, and i ' hich drawing all the figures except igures '4 and 5 are enlarged views.

Figure 1 is a side elevation of an individual pin or prong socket.

Figure 2 is a vertical section thereof Figure 3 is a top plan of the same Figure 4 is a top plan of one assembly of individual pin sockets forming a com!plete tube pin socket.

Figure 5 is a perspective view of the showing in Figure 4. " ' . - Figure 6 is a side elevation modification of the individual socket of Figure 1.

Figure 7 is a verticalsection of the socket of Figure 6. st.. , ...t "'igure 8 is a top plan of the socket of Figures and 7. .. Figure 9 is a fragmentary section of the upper uncharged portion of the tue of Figures 6 7 and 8.. .. In the drawing, wherein for the purpose of illustration is shown a Preferre"  d a 'odified form of the invention and wherein similar reference characters designate corresponding parts ' thruout the several views, the letter A may desig nate the preferred tube pins socket as a whole, the letter B, the individual sockets thereof, C a modifled form of the socket as a whole, D the idividual sockets thereof, E the envelope of an electron discharge device, such as a radio tube, and F the conductor pin or prong thereof The novel socket A is made up of a suitable number of individual sockets B carried by a supcon- dieectric material, with uer face and lower dr bottom face 12, and provided with a plurality spaced-apart perforations , one for each socket B, preferably arranged in a circle. The suport 10 my have suitable oposite :ears 14 prvided with Perforations 15 for fasteners for attaching the support 10 to a radio instrument Each individual socket B comprises an 'open mouthed body portion, receptae or housing 20, a closure 21 for the mouth, electrical currentconducting material 22 in the housing, a .lead or to the 50 terminal 23 extending from the housingand means 24 'and 25 for securing the housing 20 to the support 10.

housing 20 is, preferably, cylindrical, comprising s tube, cloed 'by a bottom wall 30, and 05 with'ist vertJcal walls .3 terminating in an upwardiy-ojpenng mouth 32. This hoiising is of any suitable electric-current conducting metal or metals, particularly metals or alloys not affected by metallic mercury.

Inserted into the mouth 32 is the closure 21 6 which may be a plug or stopper 33, but this plug 33 is more than a mere closure. It should be of soft, springy, compressible material, having dielectric properties. It must be a material which will permit a pin F to be readily inserted into and thru it but, when the pin is removed, the perforation, made by the pin, will close as the pin is being withdrawn. Soft rubber is preferred for the plug. The height of the plug is such that, when the plug is inserted into the mouth 32, the upper portion 34 thereof will project upwardly from the housing 20, the lower portion 35 will extend into the housing 20, and the distance from the upper face 36 to the lower face 37 of the plug is less than the length of the pin F, measured from where it projects from the envelope E to its free end, as shown in Figure 2.

Extending downwardly into the portion 34 from substantially the axial center of the plug 33 may be a centering depression 38, for guiding the insertion of a pin F into the plug.

In order to secure the plug 33 to the housing 20, the upper end (or mouth portion) of the latter may be crimped, as at 39, to extend slightly into the side walls of the portion 34. The electric-current conducting material 22 within the housing 20 may be any suitable mass having good electric current-conducting properties, such as metallic mercury, just so that a portion of the pin F is at all times in contact a3 with the material 22. Of course, the height or volume of this material must be such that, at all times and in all positions of the socket A or sockets B, the material and inserted pin F will be in electric contact. A suitable lead or terminal 23 is secured to the exterior of the housing 20, to project outwardly therefrom, as in Figures 1-3, and this lead 23 may be a lug integral with a ring, which forms the securing means 24. To the lead 23 may be soldered or otherwise secured a conductor, as is well known in the art.

This ring or means 24 not only supports the lug 23 but it also provides a shoulder, when suitably secured to the housing 20, as by friction, 5( solder or the like, in contact with the lower face 12 of the support 10, to prevent or resist upward movement of the housing 20 thru the support 10, when a pin F is being withdrawn from the socket B. This ring and lug are, preferably, integral 56 and of brass.

The means 25 may be a ring encircling and suitably secured to the upper end of the housing 10 below the crimped portion 39, and providing a shoulder in contact with the upper face II of 6i the support, to prevent the housing 20 from dropping out of the support 10. Preferably, this ring clasps the housing 20 in the region of the lower end 37 of the plug 33 and aids in retaining the plug in place. 6 As to the modified form C of the socket as a whole, the support thereof is, preferably, similar in every respect to the support 10, and similar reference characters are employed in designating similar parts of both supports. 7 However, while the individual sockets D of the form C have many of the characteristics of the sockets B, it will be noted in Figures 6 to 9 that there are modifications. The modified form, however, comprises a housing, a receptacle or 7 body portion 40, a closure 41, electric-current conducting material 42, a lead or terminal 43, and means 44 and 45 for securing the housing 40 to the support 10.

While a, preferably, tubular, open-mouthed housing, body portion or receptacle 40, with bottom wall 46 and vertical side wall 41 terminating in an upwardly opening mouth 48, is provided, the upper end of the housing 40 has exterior screw threads 49 and suitable spaced apart vertical slots 50 extending from its upper edge 51 to permit the upper portion of the receptacle 40 to be initially flared out as shown in Figure 9.

Inserted into the mouth 48 is the closure 41 of suitable dielectric material, having the characteristics of the closure 21, and similar reference characters are employed for both closures 21 and 41. It will be noted, however, that the closure 41 may have downwardly-sloping walls, since it is preferred to provide a forced fit of this closure 41 with the housing 40. The closure 41 extends, as does the closure 21, upwardly beyond the mouth 48, as in Figure 7.

The electric current conducting material 42 Is, preferably, similar to the material 22 and .its height or volume should be such that, despite various positions of the sockets C and D, the material 42 will provide an electric current conductor between the pin F and housing 40.

In the modified form D there is shown, by way of example, a terminal or lead 43 suitably secured to the bottom wall 46 of the housing 40, as by soldering.

The means 44 and 45 for securing the housing S40 to the support 10 may be a pair of nuts 52 and 53 having screw threads for cooperation with the screw threads 49. The nut 52 is shown positioned in contact with the lower or under face 12 of the support 10, and the other nut 51, in Scontact with the upper face II of the support 10.

Since the upper end of the housing 40 is initially flared out as shown in Figure 9, the nut 51, when screwed into place, acts to compress this end of the wall of the housing 40 about the closure or plug 4 1.

The envelope, E of the electron discharge device, is shown as of glass with the glass base 55 of the device integral with the envelope and provided with an enlarged support 56 for a metallic 0 pin F extending downwardly and outwardly of the bas55. The pin F is, of course, pointed, as at 57.

In use, when a suitable number of individual sockets B are arranged and attached to a support 5 10, to form a socket A, or a suitable number of individual sockets D are arranged and attached to a support 10 to form a socket C, as has been described, electron discharge devices may be removably attached to either socket A or C by in0 setting the pins F thereof into either the sockets B or D, as in Figures 2 and 7, whereupon, with suitable conductors attached to the leads or terminals 23 or 43, as the case may lie, and a source of electric current provided, there will be a flow 5 of electric current thru the individual sockets and electron discharge devices.

The pins F will readily penetrate both the plugs 21 and 41 and the material 22 and 42.- -Just as readily, the pins F may be withdrawn and as they 0 are withdrawn, the perforations, made in the plugs 21 or 41 by the pins F, will close behind them, that is, before the pins F are wholly withdrawn, the lower ends of the perforations made, will have closed, so that neither air nor dust and 5 the like will enter the housings 20 or 40, but'none of the material 22 or 42 will be spilled or lost.

The plugs 21 and 41 will wipe the pins F of dust, dirt, rosin, oil or the like, :as they are inserted and will wipe the pins F of material 22 or 42, as they are being withdrawn, yet the plugs will securely grip and retain the pins and parts attached to and associated therewith.

As seen in Figures 2 and 7, the glass base 55 rests directly upon the plugs 21 and 41 and is cushioned by these plugs so that, despite the economy of using devices with integral, glass bases and better functioning of such devices, devoid of separate, attached bases, the plugs function as closures, means for cleaning the pins F and cushions for the devices.

The form of invention disclosed in Figures 6 to 9 inclusive is particularly well adapted for use when it is desirable to provide a socket connection which may be readily dismembered for the replacement of parts, c a tsuch as the closure 41 or for adding or substituting current conducting material 42.

Various changes may be made to the forms of the invention herein shown and described, without departing from the spirit of the invention or scope of the following claim.

What is claimed is: In an electrical system including an electron discharge device of the type having a frangible base and a plurality of spaced-apart, substantially parallel, electric current-conducting pins extending from the base outwardly of the electron discharge device, a tubular housing of electric current-conducting material for each pin and defining a chamber having a mouth; a stopper of resilient, dielectric material for each housing, inserted into the mouth thereof and in intimate contact with the inner surface of the tubular wall of the housing at only the mouth end thereof, each stopper projecting outwardly of the chamber in which it is inserted and having an outer face with a portion of said base, closely adjacent a pin, cushioned and resting upon said face and the adjacent pin extending through and in intimate contact with the stopper and projecting, from said stopper, into said chamber, said resilient material being characterized by immediately closing any openings, in said stoppers made by said pins, upon withdrawal of said pins; and a volume of fluent electric current-conducting material in each of said housings, sufficient in volume to contact the pin therein in any position in which the housing may be disposed.


20 REFERENCES CITED The following references are of record in the file of this patent: .5 UNITED STATES PATENTS Number 671,338 768,175 1,792,973 2,200,332 Number 20,311 32,616 152,371 Name Date Halford ---------- Apr. 2, 1901 Fritchle --------_ Aug. 23, 1904 Frenz ----_______- _ Feb. 17, 1931 Henning .__-____- _ May 14, 1940 FOREIGN PATENTS Country Date Great Britain ----------- 1900 France ---------_ Sept. 13, 1927 Switzerland ---_--- Apr. 16, 1932