US2811662A

US2811662A - Diode plate construction

Info

Publication number: US2811662A
Application number: US349215A
Authority: US
Inventors: George L Rishell
Original assignee: Sylvania Electric Products Inc
Current assignee: GTE Sylvania Inc
Priority date: 1953-04-16
Filing date: 1953-04-16
Publication date: 1957-10-29
Anticipated expiration: 1974-10-29

Description

Get. 29, 1957 e. L. RISHELL DIODE PLATE CONSTRUCTION 2 Sheets-Sheet 1 Filed April 16, 1953 I III! I I I I INVENTOR 650/365 L R/SHHI.

BY W

ATTOR Oct. 29, 1957 G. L. RISHELL 2,811,662

DIODE PLATE CONSTRUCTION Filed April 16, 1953 2 Sheets-Sheet 2 INVENTOR 650/265 L. R/SHELL ATTORNEY United States Patent DIODE PLATE CONSTRUCTION George L. Rishell, Emporium, Pa., assignor to Sylvania Electric Products Inc., a corporation of Massachusetts Application April 16, 1953, Serial No. 349,215

3 Claims. c1. 313--261) This invention relates to tube construction and to diode plates therefor.

t is an object of the invention to provide a construction so as to cheapen the cost of production of a radio tube, at the same time providing better electrical connection of parts.

In particular it relates to multipurpose radio tubes utilizing a diode construction. In such tubes it is usual to provide a common cathode for the various sections of the tube and to associate the diode plate or plates with the lower portion of the cathode. The upper portion of the cathode may be associated with other elements to form an amplifying section of the tube as for example in tube types 6SQ7, 12AT6, and 12A7 although for the purpose of illustration type 7E6 has been chosen. This is a duo-diode-triode.

In tubes of this character, it has been the practice to mount the diode plates or anodes by the use of jigs in order to obtain alignment and to use intermediate support wires or connectors which may also require jig mounting. By the construction hereinafter set forth, the use of jigs is obviated since the anodes may be easily mounted on one of the mica spacers provided in the tube, thereby efiecting saving of considerable expense and also insuring accurate positioning of the anodes. Furthermore, due to the configuration of the anodes and their positioning with relation to the wire leads which extend through the base of the tube, simplification of manufacture and sturdier construction of the tube is obtained.

For a full understanding of my invention attention is directed to the accompanying drawing in which:

Fig. l is a basing diagram of the tube.

Fig. 2 is an elevational view of the elements in the tube, the tube envelope being shown partly in section and broken away, the outer base being removed.

Fig. 3 is a section through the tube on the line 33 thereof, the filament leads and other portions below the mica being shown in dotted lines.

Fig. 4 is a top perspective view of the diode section of the tube, parts being broken away.

Fig. 5 is a section through the diode portion of the tube in the line 5-5 of Fig. 3.

Fig. 6 is a plan view of a mica spacer serving to support and suitably space some of the electrodes, and

Fig. 7 is a fragmental perspective view of a modified form of attachment of the diodes to the Wire leads and a modified shield.

Referring to the figures more in detail, the reference character 10 indicates a glass envelope having cup portion 12 through an annular portion of which extend the wire leads or pins indicated as 14 with a subscript corresponding to the electrode identifying numerals in Fig. 1. Forming a part of the electrode support are support rods 16, these rods having angularly turned lower ends 18 welded to the pins 144 and 147. The top ends of all of pins 14 extend above the level of the bent ice ends 18 of the support rods. Threaded over the support rods and over the pins is a preperforated mica disc 20, the perforations therein registering with the pins and rods. The disc rests on the bent ends 18 of the rods. There is also a central perforation in the disc for the snug accommodation of a cathode 22. Mounted on the mica 20 is a pair of diode plates 24-. Each diode plate when developed is generally rectangular in form. As shown in use it is of stepped formation comprising two

parallel offset risers

26 and 28, joined by a tread 30. Each riser 28 has substantially semi-cylindrical concave portion 32 adapted to partially surround the lower end of the cathode in closely spaced relation thereto to form a plate of a diode. Formed on the lower edge of riser 26 and the lower edge of tread 3d are ears 32' adapted to pass through perforations in the mica 20 and be bent thereagainst. In lieu of the ears 32' on the tread or in addition thereto, ears may be provided on the riser 28. These ears serve to firmly hold the diode plates in proper position relative to the cathode. In order that the plates may be used interchangeably as either a right or a left diode plate and to enable one die to serve in making both plates, a second set of ears 34 is stamped out on the plates. These ears, preferably for the sake of symmetry of parts are arranged directly opposite to each other. These diode plates are welded directly to the pins and 14a either by reason of the pins being welded to sides of the risers 26, as shown in Fig. 4, or by reason of the lower projections 32' being welded to pins and 15s, as shown in Fig. 7, these pins being shorter than pins 145 and 14s. Surrounding the diode plates and shielding the triode section of the tube from the twin diode section is a shield 36 having Wing portions 38, reversely bent portions 40, and a boxing-in section comprising upright end walls 42, a vertical back wall 44 and a deck 46 bent to a horizontal position from the vertical back Wall. The reversely bent portions at their bights are suitably secured to pins 144 and 147. if desired the wing portions 38 and their shielding function may be eliminated, as shown in the form of shield 37 illustrated in Fig. 7, thereby effecting a saving in material. The deck portion has a central perforation 48 larger in diameter than the coated cathode 22, said perforation registering with the central opening in the mica 20. The end walls 42 extend above the deck 46 and are provided with ears 50 to support a suitably perforated mica 52 threaded over the rods 16 and over the ears 50, into engagement with the upper edges of walls 42. The edge of the mica 52 may be slotted from the edge thereof toward the center, as indicated at 54, to permit assembly of the cathode with the mica 52 without injury to the coating at the lower end of the cathode, prior to threading the mica over the rods 16. As is known in the art, the cathode is inserted by deflecting one of the Wings of the slot upwardly and deflecting the other one downwardly to enable the cathode to be inserted at an angle to the plate of the mica; subsequently the cathode is positioned perpendicularly to the mica surface. The cathode has a bead 56 formed thereon to prevent downward displacement of the cathode beyond the bead position, the bead being slightly larger than the central perforation in mica 52.

Within the cathode is a filament 58 secured to two tabs 60 welded respectively to pins 141 and 14s. Suitably spaced above the mica 52 is a similar mica 62 and interposed between the micas is the filament containing cathode 22 provided with a second bead'64. Also so interposed is a grid 66 and a plate 68, the grid and plate being provided with extensions, as is common in the art, to pass through the micas, the plate extension being bent more or less thereover as found necessary.

This grid is electrically connected by a grid support tab 76 to pin 143 while the plate is connected by a lead 72 to pin 142. This lead is not visible in Fig. 2 since it is hidden by the cathode and other parts. The cathode is connected to the cathode pins 144 and 147 by tab 74 connected to rod 16 which in turn, as set forth above, is connected to said pins. The reference character 76 indicates the getter organization.

The glass envelope is made in two parts, a cup-shaped member in which the leads 14 are embedded and a bulb member which after assembly of the elements in the tube is fused onto the cup shaped member. The line of juncture is indicated by the dotted line 78 in Fig. 2.

In assembling the parts, the rods 16 are secured to the leads 144 and 147 of the cup shaped member after which the lower mica disc 20 is threaded onto the rods and pins, then the diode plates and shield are slid into place. Next the mid mica 52 with filament loaded cathode 22 positioned in the mica is slid over the rods and onto the ears'50 on the shield after which the grid and plate are slipped over the cathode. The connecting tabs, leads and getter are then welded in place. Of course the shield is also secured to the rods and the ears 32 bent over the mica or welded to the pins, as desired. The extensions on the plate are bent over under the micas to attain the desired degree of rigidity of structure, or the rods 16 may be swaged adjacent the micas to inhibit movement of the assembled electrodes. Thus the tube may be assembled without the use of jigs and in an expeditious manner. Furthermore, the dual eared construction 32', 34 on the diode plates permits cheaper manufacture of parts since but one set of dies rather than two is necessary in their manufacture. Since diode pins are conventionally arranged in proximity to each other, the parallel symmetrical diode plate arrangement set forth herein allows for direct connection with these pins Without the use of separate and intermediate tabs. The plate construction shown furthermore contributes toward rigidity of parts.

Having thus described my invention, what I claim as new is:

1. An electronic device comprising a header having lead-in wires extending into the device, a pair of upright support rods having lower angularly bent ends securely fastened to two of said lead-in wires, an insulating wafer threaded on said support rods and resting on said bent ends, electrode elements having edges abutting the wafer and directly secured to other lead-in wires;

2. An electronic device comprising a header having lead-in wires extending into the device, a pair of upright support rods having lower angularly bent ends securely fastened to two of said lead-in wires, an insulating wafer threaded on said support rods and resting on said bent ends, electrode elements having edges abutting the wafer, other lead-in wires extending through the wafer and directly secured to said electrode elements.

3. An electronic device comprising a header having lead-in wires extending into the device, a pair of upright support rods having lower angularly bent ends securely fastened to two of said lead-in wires, an insulating wafer threaded on said support rods and resting on said bent ends, electrode elements having edges abutting the wafer and having projections extending down through and below the wafer, and other lead-in wires terminating directly below the wafer and secured to said projections.

References Cited in the file of this patent UNITED STATES PATENTS 1,672,483 Crowley June 5, 1928 2,352,933 Beggs July 4, 1944 2,708,329 McKee May 17, 1955 FOREIGN PATENTS 662,433 Great 'Britain Dec. 5, 1951