US2551847A - Hermetically sealed operating device - Google Patents

Description

May 1953 R. D. NELSON 2,551,847

HERMETICALLY SEALED OPERATING DEVICE Filed April 5, 1947 INVENTOR. Ala/7427 4 5. /Ve/5a22 Patented May 8, 1 951 FATENT FWE HERMETICALLY SEALED OPERATING DEVICE Delaware Application April 5, 1947, Serial No. 739,597

1 Claim. 1

This invention relates to an hermetically sealed operating device.

Herrnetically sealed transformers are comlng into more common use in the electrical industry and it is desirable to have metal to metal seals at all entrances to the transformer tank. Vari ous seals for non-moving parts, such as bushing seals have been developed, and the covers of the tanks have been welded in place to provide an hermetically sealed transformer.

Objects of this invention are to provide a metal to metal seal for an operating device having a movable ernal operating part located on the outside of the tank and a movable internal located on the inside of the tank or container and arranged to be operated by the externally located operating member and still maintain the hermetic metal to metal seal for the tank or contamer. .A oecific instance of the use of such a device is for tap changing for an hermetically sealed transformer though the device is capable of other uses such as resetting or tripping or operating hermetically sealed switches or other h rmetically sealed apparatus.

An embodiment of the invention is shown in the accompanying drawings, in which:

Figure l is a plan view of the device.

Figure 2 is a vertical sectional view.

Referring to the drawing, it will be seen that a transformer tank or housing has been indicatcd by the reference character i and a flange member by the reference character 2. The flange 2 is brazed, welded, or otherwise secured to the tank and is provided with an internally threaded aperture into which a bearing bushing 3 is screwed. This bushing constitutes a bearing for the shaft 3 which is the operating shaft for a tap changer, a switch or other device shown in block form and indicated by the reference character 5. This device whether it be a tap changer, a switch of some other type, or any other form of mechanism is the internally located member in an hermetically sealed casing or container such as the transformer tank E.

An external operating member, such as the handle 5 is provided for operating the internally located member. The shaft 3 is provided with a laterally bent or offset portion 3' which is provided with a recess 8 at its upper end. A pin 9 is located within the recess 8 and the shaft 5-, l is free to rotate without rotating the pin ii. The pin 9 is preferably integral with a metal disk i0 which has an outwardly projecting pin II.

A flexible metal bellows i2 is soldered or otherwise secured in an air-tight manner to the disk l9 and flange 2 at its upper and lower ends, respectively. T is bellows does not rotate but tilts from one position to another as the shaft :3, l is rotated.

Means, in the form of a slotted disk or crank member I3 is provided with a radial slot M which loosely receives the pin it and which moves the pin around when the disk is rotated thus causing rotation of the shaft 4, l without rotating either the disk it or the bellows l2. If desired, a part of the lower face of the disk is may be slanting as indicated at E5 and located immediately above the disk 50. This will act to limit outward motion of the disk iii. A shaft is is formed integral with the disk I3 and is secured as by means of a pin l? or in any other way to the external operating member 6.

A casing or housing 58 is attached to the flange 2 of the tank and protects the bellows E? from the weather and also furnishes a bearing for the shaft it. If desired, a graduated plate l9 may be secured to the top of the housing I8 to indicate in conjunction with the operating member 6, the particular tap or position of the internal member.

It will be noted that the member consisting of the disk ill with its projecting pins 9 and H constitutes a coupling member between the external operating means and the shaft 4, l, and is pivotally or revolubly joined to the shaft l, 7.

It will be seen that a novel form of metal to metal hermetic seal has been provided whereby an internal member or mechanism located in an hermetically sealed container can be operated by an externally located operating member.

Although this invention has been described in considerable detail, it is to be understood that such description is intended as illustrative rather than limiting, as the invention may be variously embodied and is to be interpreted as claimed.

I claim:

An hermetically sealed operating device comprising a container, an internally located device, a shaft for operating said internally located device, said shaft projecting through said contoiner and having a laterally deflected outer end at an angle to the axis of said shaft, a coupling member consisting of a disk having an outwardly projecting pin and an inwardly projecting pin, said inwardly projecting pin being pivotally connected with the laterally deflected outer end of said shaft, a flexible metal bellows hermetically sealed to said disk and to said container and surrounding the laterally deflected end of said shaft, a rotary external member operatively coupled to said outwardly projecting pin, and a housing supported from said container and enclosing said bellows and furnishing a support for said rotary external member, said rotary member having a slanting inner face arranged to coact with said disk to limit outward motion of said bellows.

ROLLAND D, NELSON.

REFERENCES CITED The following references are of record in the file of this patent:

Number Number 4 UNITED STATES PATENTS Name Date Holmes Nov. 21, 1922 FOREIGN PATENTS Country Date Switzerland 1942 Great Britain 1919 Great Britain 1943

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