US2915172A

US2915172A - Getter flag

Info

Publication number: US2915172A
Application number: US781625A
Authority: US
Inventors: George L Rishell
Original assignee: Sylvania Electric Products Inc
Current assignee: GTE Sylvania Inc
Priority date: 1958-12-19
Filing date: 1958-12-19
Publication date: 1959-12-01
Anticipated expiration: 1976-12-01

Description

Dec. 1, 1959 R s 2,915,172

GETTER FLAG Filed Dec. 19, 1958 INVENTOR.

Q 660196 L. Rabid! Arm/3N5) United States Patent M GETIER FLAG George L. Rishell, Emporium, Pa., assignor, by mesne assignments, to Sylvania Electric Products Inc., Wilmington, Del., a corporation of Delaware Application December 19, 1958, Serial No. 781,625

4 Claims. (Cl. 206-.4)

This invention relates to getters such as are utilized in electron tubes to chemically clean up residual gases therein after they had been evacuated through the use of pumps or the like.

In some electron tubes because of the geometry of the electrodes as well as thatv of the insulating spacers, and because of the desirability of flashing the getter in only certain areas of the tubes, toroidal shaped getter supports or flags have been'employed. A common form of getter flag comprises a washer of nickel with indentations in a surface of the washer to receive the getter pellets to be flashed and the washer is covered by a second nickel washer, suitable channels or cuts being made in the washers to permit volatilization and dispersion of the pellets when they are flashed.

It is an object of the invention to provide a getter support or flag of the washer type with getter pellet cover material and yet at a saving of labor in assembling the parts and in the amount of flag material utilized.

For a fuller understanding of the invention attention is directed to the following specification when taken in conjunction with the accompanying drawing in which:

Fig. 1 is a plan view of the getter flag and contained pellets.

Fig. 2 an end elevation thereof.

Fig. 3 is a fragmental view of the flag showing an apertured getter pellet retainer.

Fig. 4 is a similar view showing a channeled getter retainer and Fig. 5 is an enlarged fragmentary sectional view taken on the line 5-5 of Fig. 1.

In carrying out my invention, a single thickness of a nickel plate is employed instead of the laminated plates of the prior art and the plate is initially stamped out to form a circular disc 10. By the same tool, four center flaps 12, trapezoidal in plan view, are formed, as well as four depressions 14 in the body of the plate. After the stamping operation, getter pellets 16 are placed in the depressions. Then the flaps are bent over at their bases into overlapping relationship with the plate, thus leaving a central opening 18. The flay does not tightly 2,915,172 Patented Dec. 1, 1959 ted lines in the position it had been before it was bent over a portion of the plate containing a getter pellet.

If desired, as indicated in Fig. 3, the flaps 14 may be provided with slots 20 to permit easy dispersion of the pellet material upward when flashed or, as'indicated in Fig. 4, with channels 22 leading from the far ends of the pellet recesses to the periphery of the washer to facilitate radial dispersion of the material.

The getter loaded flag is suitably carried by a fixed part of the electron tube by being welded thereto, as is customary in the art.

Having described the invention, Whaft is claimed is:

1. A getter assembly comprising a washer having an outer periphery and an inner opening bounded by a wall, depressions in the upper surface of the washer, getter pellets in said depressions, and flaps having base portions integral with said wall and overlying the depressions.

2. A getter comprising a planar washer having an outer periphery and an inner central opening bounded by a wall, flaps formed out of the planar material of the washer integral with the washer and having base portions connected with the washer at said wall, depressions in the upper face of said washer, and getter pellets in said depressions, said flaps lying in contact with the washer and overlying the pellets.

3. A getter assembly comprising a washer having an outer periphery and an inner opening bounded by a wall, depressions in the upper surface of the washer, getter pellets in said depressions, and flaps having base portions integral with said wall and overlying the depressions, said flaps being slotted to permit dispersion of the getter material upon vaporization thereof.

4. A getter assembly comprising a washer having an outer periphery and an inner opening bounded by a Wall, depressions in the upper surface of the washer, getter pellets in said depressions, and flaps having base portions integral with said wall and overlying the depressions, said flaps being channeled to permit dispersion of the getter material upon vaporization thereof.

References Cited in the file of this patent UNITED STATES PATENTS 2,093,273 Haslauer Sept. 14, 1937 2,209,870 Anderson July 30, 1940 2,282,302 Bickley May 5, 1942 2,462,813 Reiner Feb. 22, 1949 2,822,080 Buescher et al Feb. 4, 1958