# US 2010/0072175 A1 · Electrical switching device having a contact piece which can move along a movement axis

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- Number: US 2010/0072175 A1
- Document ID: US20100072175A1
- Status: Published application
- Kind: A1
- Application number: 12/374,010
- Filed: 2007-07-11
- Published: 2010-03-25
- Earliest claimed: 2006-07-18
- Assignees: Siemens Aktiengesellschaft
- Inventors: Peter Stenzel
- Web page: https://patentgrep.com/patent/US20100072175A1

## CPC

- H01H 31/003: {Earthing switches (H01H31/02 - H01H31/26 take precedence; contact made by liquid jet H01H29/32; for substations H02B1/16, H02B5/01; for withdrawable switchgear H02B11/28; for gas-insulated switchgear H02B13/075)}
- H01H: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B7/10; electrolytic self-interrupters H01G9/18; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K17/00)

## Abstract

An electrical switching device has a displaceable contact piece mounted on an encapsulated housing. The displaceable contact piece extends within and outside of the encapsulated housing. The displaceable contact piece is sealed gas-proof in relation to the encapsulated housing. For forming a gas-proof transition, first and second sealing elements are provided, which, as axial sealing elements, are alternately pressed against the encapsulated housing by peripheral collars of the displaceable contact piece. A third sealing element is provided for sealing the displaceable contact piece in a radial direction.

## Claims

### Claim at position 1

1-12. (canceled)

### Claim 13

An electrical switching device, comprising:
an encapsulating housing;
a movable contact piece mounted to said encapsulating housing and movable along a movement axis, said movable contact piece extending inside and outside of said encapsulating housing.

### Claim 14 (depends on 13)

The electrical switching device according to claim 13, wherein said encapsulating housing has an internal volume gas-tightly sealed against a medium surrounding said encapsulating housing.

### Claim 15 (depends on 13)

The electrical switching device according to claim 13, which comprises a first sealing element and a second sealing element for sealing said movable contact piece at said encapsulating housing, said first sealing element being effective to produce a sealing effect in a first position of said contact piece, and said second sealing element being effective to produce a sealing effect in a second position of said contact piece.

### Claim 16 (depends on 15)

The electrical switching device according to claim 15, wherein said first sealing element and said second sealing element are configured to produce a respective sealing effect alternately during a switching movement.

### Claim 17 (depends on 15)

The electrical switching device according to claim 15, which comprises a collar disposed circumferentially around said contact piece, and wherein at least one of said first and second sealing elements rests on said collar to produce the sealing effect.

### Claim 18 (depends on 15)

The electrical switching device according to claim 15, wherein said first and second sealing elements are disposed with an axial spacing distance therebetween in a direction along the movement axis of said contact piece, and wherein a third sealing element is disposed between said first and second sealing elements.

### Claim 19 (depends on 15)

The electrical switching device according to claim 15, wherein said third sealing element is disposed to be effective to maintain a sealing effect once the sealing effect of at least one of said first and second sealing element has been lost.

### Claim 20 (depends on 15)

The electrical switching device according to claim 15, wherein at least one of said first and second sealing elements is an axial seal.

### Claim 21 (depends on 18)

The electrical switching device according to claim 18, wherein said third sealing element is a radial seal.

### Claim 22 (depends on 18)

The electrical switching device according to claim 18, wherein said first and second sealing elements are axial seals and said third sealing element is a radial seal.

### Claim 23 (depends on 15)

The electrical switching device according to claim 15, which comprises a reversibly deformable casing resting on said encapsulating housing and surrounding at least one of said first and second sealing elements.

### Claim 24 (depends on 18)

The electrical switching device according to claim 18, which comprises a reversibly deformable casing resting on said encapsulating housing and surrounding at least one of said first, second, and third sealing elements.

### Claim 25 (depends on 13)

The electrical switching device according to claim 13, wherein said movable contact piece is in electrically conductive contact with said encapsulating housing.

### Claim 26 (depends on 25)

The electrical switching device according to claim 25, which comprises a sliding contact assembly disposed to maintain contact between said contact piece and said encapsulating housing.