US1651257A - Vacuum-tube socket - Google Patents

Description

Nov.- 29, 1927. 1,651,257-

H. C. DAVIS VACUUM TUBE SOCKET Filed Match 14, 1927 INVENTOR HARRY C. DAVIS BY m ATTORNEY WITNESSES Patented Nov. 29, 1912.7,

UNITED STATES HARRY G. DAVIS, OF BRIGHTON, MASfiACI-IUSETTS.

VACUUM-TUBE sooner.

Application filed March 14, 1927. Serial No. 175,283.

The present invention is concerned with the provision of a vacuum tube socket in which is incorporated a rheostat of the compression type so that the voltage of the filament circuit may be regulated with absolute accuracy in the case of each individual tube.

Thus the rheostat may be eliminated as a unit part of a radio set and replaced by an exact filament voltage regulator associated with each tube. Considering the individual characteristics of vacuum tube filaments and the degree of variation caused by use, maximum efficiency can only be obtained by the use of a variable resistor of this type.

An object of the present invention is to provide a tube socket of the above noted character which will be substantially conventional in appearance and well suited to the requirements of economical manufacture.

Another object is to provide a device so constructed that the resistor may be accurately adjusted with expedition and facility, and which will be rugged, durable and elfi cient in use.

With the above noted and other objects in view, the invention consists in certain novel features of construction and combinations and arrangements of parts as will be more fully hereinafter set forth and pointed out in the claims. The invention may be more fully understood from the following descrip tion in connection with the accompanying drawings, wherein-- Fig. 1 is a view in side elevation of a socketembodying the invention.

Fig. 2 is a top plan view thereof.

Fig. 3 is a bottom plan view thereof.

Fig. 4 is an enlarged sectional detail through the rheostat on the line H of Fig. 2.

In the drawings I have used the reference character 10 to designate the base or body of the device supported on the usual legs 11 and including a centrally raised boss 12 on which a conventional vacuum tube (not shown) is adapted to rest, the tube contacts passing through openings 13 in the boss and base and engaging the spring terminal fingers 14, 15, 16 and 17 lying against the under face of the base.

Preferably three of the terminal fingers are anchored to three corners of the plate by screws 18 retained by lock nuts 19 and carry ing binding nuts 20 for the attachment of wires (not shown), and carrying also lugs 21 to which electrical connectors may be soldered if such a connection is desired instead of that afforded by thebinding posts.

The grid circuit is completed through terminals 14 and 15 and the ilament circuit through terminal 16 at the minus side, and the terminal 17 at the plus side, the latter terminal finger being associated with the resistor element in a manner which I shall now describe.

Finger 17 instead of being held by a screw is bent around a hollow depending cylindrical extension 85 of the base plate 10 and anchored by a pin 22 projecting inwardly through the bottom of the extension This pin is in electrical contact with a brass disc 23 molded. in the bottom of the cylinder. Fitting the cylinder and stacked upon the disc are a series of oppositely facing dished carbon discs 24: surmounted by a brass disc 25 against which any desired pressure may be exerted by a screw 26. This screw threaded through a conductive closure plate 27 for the open upper end of cylinder 35, the plate being retained in place by screws 28 or other suitable means. A binding nut 29 threaded onto an upstanding extension 30 of plate 27 preferably clamps a plate 31 carrying a solder lug 32 in position so that either a wire or a soldered connection may be used.

A knob 33 or other manually operable handle means is carried by the exposed end of screw 26 and the resistance in the filament circuit may be conveniently regulated by ad justing the screw to predetermine the compression of the compression type rheostat formed by the carbons.

Obviously other forms of bases, sockets and contacts might be used and other material used in the formation of the rheostat if desired, although I find the carbon discs quite satisfactory.

In fact, various changes and alterations might be made in the general form and arrangement of the parts described withoutdeparting from the invention. Hence I do not wish to limit myself to the details set forth, but shall consider myself at liberty to make such changes and alterations as fairly fall within the spirit and scope of the appended claims.

I claim:

1. A vacuum tube socket including a base block having openings therein for the reception of tube terminals and including electrical contacts associated with said openin said block including ieet one of which comprises a hollow cylindrical depending extension, at rheostat housed in said extension, :1 cover for the extension and 'rheosta't adjusting means carried by the cover.

2. A vacuum tube socket, including a base block having openings therein for the reception of tube terminals, electrical contacts associated With the openings, said block including feet, one of which comprises a hoi- 10 10W cylindrical depending extension and a irheostait housed in said extension.

HARRY O. DAVIS.

Images