US1572530A

US1572530A - Vacuum tube

Info

Publication number: US1572530A
Application number: US268676A
Authority: US
Inventors: William F Hendry
Original assignee: Western Electric Co Inc
Current assignee: AT&T Corp
Priority date: 1918-12-28
Filing date: 1918-12-28
Publication date: 1926-02-09
Anticipated expiration: 1943-02-09

Description

Feb. 9 1926. 1,572,530

" w. F. HENDRY VACUUM TUBE Fi led Dec. 28, 1918 //7 van for: W/'///'a/77 f fiend/y. y

Patented Feb. 9, 1926.

UNITED STATES PATENT OFFICE.

WILLIAM F. HENDRY, OF NEW YORK, N. Y., ASSIGIN'OR TO WESTERN ELECTRIC COM- IPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

VACUUM TUBE.

Application filed December 28, 1918. Serial No. 268,876.

To all whom it may concem:

Be it known that I, lVILLIAM F. HENnnY,

a citizen of the United States, residing at New York, in the county of New York, State of New York, have invented certain new and useful Improvements in Vacuum Tubes, of which the following is a full, clear, concise, and exact description.

This invention relates to improvements in vacuum tubes, and more particularly to the mounting of the terminal connections for the leading-in wires of a vacuum tube.

The end of the vacuum tube having the leading-in wires is usually formed with an elongated portion or neck and this is surrounded by a shell having a base piece on which are mounted terminal connections for the leading-in wires to the various electrodes of the tube.

Heretofore it has been the practice to secure the shell and correlated parts in position on the tube by means of sealing wax, which is poured into the shell in such a manner as to fill all the intervening space. It has been found in the use of the tubes that at the temperatures which are sometimes reached this sealing material is melted with consequent failure of proper operation.

It is the object of this invention to remedy 30 this defect. The object is attained by attaching the shell to the tube by means of a relatively small body of cement having a high melting point such as a mixture of Portland cement and shellac and by closing the outer end of the shell with a cap of insulating material, such as micarta, having a high melting point relative to sealing wax. The leading-in wires of the tube are attached tocontract terminals which may be mounted on an insulating spider or Web as heretofore and which extend through openings in the cap above referred to. \Vhen the cap has been placed in position with the terminals extending therethrough, it is secured by turning or spinning the endof the shell inwardly, the. cap being provided in the preferred form with a peripheral groove for the reception of the flange thus formed.

These and other novel features of the structure will be better understood from the following detail description taken in connection with the accompanying drawings, in which Fig. 1 is a side elevation with parts broken away of a vacuum tube to which the shell has been applied, but before the insulating web and cap have been placed in position. Figs. 2 and 3 are a plan and elevation respectively of the insulating web. Figs. 4 and 5 are a bottom plan and vertical section respectively of the insulating cap. Fig. 6 is an enlarged perspective partly broken away of the shell in its co-.nplete l form.

As shown in Fig. 1 the glass bulb 10 consuch as cement and shellac 19 is placed between the sleeve and the neck and tamped firmly in place by any suitable instrument through the open end of the sleeve. A web 20 of insulating material having contact posts 21 mounted thereon and clips 22 at the base of the contact posts is placed on the .shoulder 16, being adjusted to its proper position by means of a notch 23 in the web and a cooperating projection 24 pressed inwardly in the sleeve. It will be understood that the base of the tube is adapted to be inserted in a socket (not shown) which has a series of spring contacts for the contact posts, and is locked therein by n'ieansof a bayonet joint one member of which is shown in the projection 29. It will be seen therefore that the notch 23 and projection 24, or equivalent means, are desirable to insure the proper position of the contact posts. An illustration of a socket which may be used with this tube is described in U. S. Patent 1,325,865 of Herbert E. Shreeve, issued Dec. 23. 1919. The leading-in wires 25 are then attached to the clips 22 in any suitable manner. for instance by soldering. A cap 26 of micarta or any desired insulating material is placed upon the web 20, the contact posts extendiig through openings 27 in the cap. The n1elting point of cap 26 is higher than any temperature to which the tube will be subjected and is preferably higher than the melting point of sealing wax which has been used heretofore. -This is true also of the sealing ltltl material 19 and the web 20. A groove 28 is formed in the periphery of the cap and when the cap is in position the outer end of the sleeve is turned or spun into this groove so as to hold the parts rigidly in position and at the same time to protect the end ol the sleeve by the over-hanging side of the groove 28. As shown in Figure 5, the plate 26 is very thin relative to its diameter.

This invention is not limited to the form described above for it is evident to one skilled in the art that various modifications may he made therein without departing in any wise from the spirit of this invention as defined in the appended claims.

V hat is claimed is:

1. A vacuum tube comprising a metal sleeve surrounding the neck of the tube and secured thereto by means of sealing material placcd between said neck and sleeve. and an insulating cap fitted in the end of said sleeve, said cap having openings therethrough for the passage of the electrical connections of the tube and having a peripheral groove, the end of said sleeve be ing turned inwardly into said groove.

'2. A vacuum tube comprising a metal sleeve secured to the neck of the tube, said sleeve having an annular shoulder near its outer end, an insulating web engaging said shoulder, contact terminals on said web, connections from said terminals to the in terior of the tube, a cap of insulating material fitted in the end of said sleeve, said ca having openings for the protrusion of said contact terminals and means for securing said cap in position.

3. A vacuum tube comprising a. metal sleeve secured to the neck of the tube, said sleeve having an annular shoulder near its outer end, an insulating web engaging said shoulder, contact terminals on said web, connections from said terminals to the interior of the tube, and a cap of insulating material fitted in the end of said sleeve, said cap having openings for the protrusion of said contact terminals and having a peripheral move, the end of said sleeve beingturne inwardly into said groove.

4. vacuum tubecomprising a metal sleeve surrounding the neck of the tube and secured thereto by means. of sealing material placed between said neck and sleeve, said sleeve having an annular shoulder near its outer end, an insulating web ,engaging said shoulder, cont act terminals on said web, connections from said terminals to the interior of the tube, and a cap of insulating said cap having openings for the protrusion of said contact terminals and having a peripheral groove, the end of said sleeve being turned inwardly into said groove.

5. A vacuum tube comprising a metal sleeve secured to the neck of the tube by sealing wax placed between said sleeve and said neck, a thin micarta late fitted in the end of said sleeve, said ate having openings therethrough for tlie passage of the electrical connections of the tube' and having a ieripheral groove, the end of said sleeve eing turned inwardly into said groove.

6. A vacuum tube comprisim a metal sleeve secured to the neck of the tube, a plate of insulating material fitted in the end of said sleeve, a terminal bearing plate fitted in said sleeve adjacent said first plate, said first plate having openings therethrough for the protrusion of said terminals, said second plate having cutaway portions.

7. A base for a vacuum tube comprising a shell having parallel ridges, a lurality of discs of insulating material therebetween, and terminals on one of said discs projecting through the other disc.

8. A base for a vacuum tube comprising a metal shell, a ridge thereon, an insulating member carrying a terminal and sup orted by said ridge, and an insulator carried by said shell having an aperture therein for receiving said terminal.

9. A vacuum tube base comprising a metal shell, an apertured insulating member closing one end of said shell, a, second insulating member mounted in saidshell adjacent said first insulating member, and terminal pins carried by said second insulatin member, said terminal ins projecting through the a ertures in said first insulating member and eyond the end of said shell.

10. A vacuum tube com rising a neck, a metal shell secured to said neck, and an end piece for said shell, the faces of said end piece having a diameter greater than that of the end of said shell.

'11. A vacuum tube comprising a neck, a metallic shell surrounding said neck and having parallel ridges; a pluralityof discs of insulating material interposed between said ridges and terminal members carried by one of said discs and projecting through apertures in the other of said discs;

In witness whereof, I hereunto subscribe my name this 27th day of December A. D.,