# US 4,394,550 A · Gas-blast switch actuatable by a mechanical drive by means of a drive element

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- Number: US 4,394,550 A
- Document ID: US4394550A
- Status: Granted
- Kind: A
- Application number: 06/270,782
- Filed: 1981-06-05
- Granted: 1983-07-19
- Earliest claimed: 1980-07-04
- Assignees: Sprecher & Schuh AG
- Inventors: Hubert Wallimann
- Web page: https://patentgrep.com/patent/US4394550A

## CPC

- H01H 3/605: {making use of a fluid damper}
- 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

A drive element coupled with a mechanical drive is guided out of a switch housing through a through-passage housing containing a liquid bath. In the liquid bath there is immersed a hydraulic damping device containing a cylinder and piston and cooperating with said drive element, so that, with virtually no additional constructional expenditure at the drive, there is achieved a dependable braking of the drive element towards the end of a switching stroke. The piston of the hydraulic damping device is connected by means of a drag connection with the drive element. This drag connection includes at least one entrainment rod connected with the piston and acted upon by an entrainment collar provided at the drive element.

## Claims

### Claim 1

A gas-blast switch containing an operating mechanism including a damping device comprising a mechanical drive;
a drive element connected to said mechanical drive;
said gas-blast switch being actuatable by means of said mechanical drive and said drive element;
a switch housing;
a through-passage housing connected to said switch housing and containing a liquid bath;
said drive element being guided out of said switch housing through said through-passage housing and said liquid bath, with said liquid bath serving as a gas-tight seal for said drive element; and
a hydraulic damping device immersed in said liquid bath within said through-passage housing and cooperating with the drive element.

### Claim 2 (depends on 1)

The gas-blast switch as defined in claim 1, wherein:
said drive element comprises a thrust rod longitudinally displaceable back-and-forth; and
said damping device comprises a cylinder-piston unit which is arranged substantially parallel with respect to said thrust rod.

### Claim 3 (depends on 2)

The gas-blast switch as defined in claim 2, wherein:
said cylinder-piston unit is substantially coaxially arranged with respect to said thrust rod.

### Claim 4 (depends on 3)

The gas-blast switch as defined in claim 3, wherein:
said cylinder of the cylinder-piston unit is secured to the through-passage housing; and
a drag connection means for coupling said piston of the cylinder-piston unit with the thrust rod.

### Claim 5 (depends on 4)

The gas-blast switch as defined in claim 4, wherein:
said drag connection means comprises at least one entrainment rod coupled with said piston;
an entrainment collar provided for said thrust rod; and
said entrainment rod engaging through said entrainment collar on the thrust rod and being displaceable therethrough to a limited extent.

### Claim 6 (depends on 5)

The gas-blast switch as defined in claim 5, wherein:
said piston surrounds the thrust rod while leaving free an annular gap; and
said entrainment collar during the course of a cut-off stroke of the gas-blast switch serving as a closure element for said annular gap.

### Claim 7 (depends on 6)

The gas-blast switch as defined in claim 6, wherein:
said entrainment collar comprises an entrainment ring.