US1166217A - Seal. - Google Patents

Description

R P. JACKSON.

SEAL.

APPLICATION FILEDAPR. 3, 1914.

Patented Dec. 28, 1915.

lllrili o l" R m N L E V Wu ATTORN EY WITNESSES:

UNITED STATES PATENT OFFICE.

RAY I. JACKSON, OF EDGEWOOD PARK, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

SEAL.

I Specification of Letters Patent.

Patented Dec. 28, 1915.

Application filed April 3, 1914. Serial No. 829,165.

To all whom it may concern:

Be it known that I, RAY P. JACKSON, a citizen of the United States, and a resident of Edgewood Park, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Seals, of which the following is a specification.

My invention relates to seals between metallic conductors and the walls of vitreous containers, and especially to seals for conductors that are adapted to carry heavy currents.

The purpose of my invention is to construct a seal of the type specified which shall be simple and inexpensive to manufacture, rugged in construction and adapted to hold a vacuum-tight joint throughout extreme temperature ranges.

In the accompanying drawing, Figure 1 shows a sectional elevation of the preferred form of my improved seal, and Fig. 2 is a sectional elevation of a modification thereof.

1 designates the Wall of a container which is of vitreous material such, for example, as glass or quartz.

2 is a current conductor of copper, iron or similar material that extends into the container and is here shown as the stem of an anode 3 of a mercury vapor rectifier. Brazed to the stem 2 is a tubular metal member 5 that is flared at its upper end and extended downwardly as a bell shaped hood 6 to overhang the neck 7 of the container. The neck 7 is outwardly flared at its upper end to engage the metal hood at approximately the central zone thereof. Integral with the flaring neck, is a bell shaped member 8 of vitreous material that extends both upwardly and downwardly and is intimately sealed to the inner surface of member 6 by a suitable flux. In order to insure that no leakage shall occur between members 2 and 5, they may be united by an autogenous weld at the point 4.

The device of Fig. 2 is the same as that of Fig. 1 except that the metal bell shaped member is extended upwardly, as shown at the point 9, instead of being reentrant, and has its inner surface attached to stem 2 above the upper end of the container 1.

Although the coeflicient of expansion of the metal member 6 is greater than that of the glass member 8, I so manufacture the seal that there will be no strain on the joint from accidental shocks and blows.

between these two members when at the temperature 'of operation. When the device cools, the member 6 will contract more than member 8 and thus place the joint and the latter member under compression. Owing to the fact that the member 7 engages the member 8 at the central zone of the latter, the compressive force will be balanced and there will be little or no bending or twisting moment about the point of engagement. The walls of the bell shaped membersare nearly cylindrical below the central zone thereof, thus insuring freedom from shearing stress on the seal between the two, which would be present were the members more nearly conical in shape. The metal being outside the glass, protects the latter Furthermore, the metal on the outside of the container that is in electrical connection with the anode stem will create a static field in the manner set forth in United States Patent, No. 996,582 to Joseph L. R. Hayden and serve to prevent fading and the puncture of the container walls.

What I claim is:

1. The combination of a tubular member of vitreous material having an outwardly flared end portion and an integral extension of bell sha.pe,with a metallic member extending into the tubular member, and a metallic bell shaped member sealed to the outer surface of the integral extension.

2. The combination of a tubular member of vitreous material having an outwardly flared end portion and a bell shaped integral extension supported at its central zone by the outer edge of said flared portion, with a metallic member extending into the tubular'member, and a metallic bell shaped member sealed to the outer surface of the vitreous bell shaped member.

3. The combination of a tubular member of vitreous material having an outwardly flared end portion and a bell shaped integral extension supported by the outer edge of said flared portion, with a metallic member extending into the tubular member, and a metallic bell shaped member sealed to the outer surface of said integral extension and having a reentrant portion attached to said metallic member.

4. The combination of a tubular member of vitreous material having an outwardly flared end portion and a bell shaped integral extension supported by the outer edge of said flared portion, with a metallic member extending into the tubular member, a metallic bell shaped member sealed to the outer surface. of said integral extension, said bell shaped member having approximately cylindrical open ends.

5. The combination of a tubular member of vitreous material having an outwardly flared end portion and a bell shaped integral extension supported at its central zone by the outer edge of said flared portion, With a metallic member extending into the tubular member, and a metallic bell shaped member sealed to the outer surface of the integral extension and having a reentrant portion attached to said metallic .member,

RAY P. JACKSON. Witnesses:

GOLDIE E. MGGEE, B. B. Hmns.

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