# US 11,444,506 B2 · Line bushing and terminal studs with increased ignition gaps

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- Number: US 11,444,506 B2
- Document ID: US11444506B2
- Status: Granted
- Kind: B2
- Application number: 16/618,284
- Filed: 2018-06-01
- Published: 2021-05-27
- Granted: 2022-09-13
- Earliest claimed: 2017-06-02
- Assignees: Siemens Aktiengesellschaft
- Applicants: Siemens Aktiengesellschaft
- Inventors: Johannes Meyer; Thomas Mutzl; Josef Sebastian Schneider
- Web page: https://patentgrep.com/patent/US11444506B2

## CPC

- H02K 5/136: explosion-proof
- H01R 13/533: Bases, cases made for use in extreme conditions, e.g. high temperature, radiation, vibration, corrosive environment, pressure (H01R13/52 takes precedence)
- H02G 3/22: Installations of cables or lines through walls, floors or ceilings, e.g. into buildings
- H02K 5/225: {Terminal boxes or connection arrangements (specially adapted for submersible motors H02K5/132)}
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- H01R: ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H02G: INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES

## Abstract

The invention relates to a line bushing (1) in a housing (2) of an electrical machine (1) in explosive atmospheres, having a threaded bush (100) and a terminal stud (200), wherein the threaded bush (100) is an insulator and is located in, particularly screwed into, a recess in the housing (2), wherein the terminal stud (200) is made from an electrically conductive material and is provided, at least in sections, with a thread, wherein connection options (206) for lines and braids are provided at either end of the terminal stud (200), wherein the terminal stud (200) can be screwed into the threaded bush (100).

## Claims

### Claim 1

A dynamo-electric machine for explosive environments, comprising:
a housing having a threaded recess; and
a line bushing made from an electrically conductive material and having a threaded portion and a stop shoulder and opposite ends, each of the opposite ends having a connection option for a line or braid,
a threaded bush configured as an insulator and having a shoulder and an external thread with a first thread length for threaded engagement with the threaded recess of the housing, said shoulder and external thread defining a first ignition gap when the threaded bush is screwed into the threaded recess of the housing, and
an internal thread with a second thread length for threaded engagement with the threaded portion of a terminal stud, with the second thread length being greater than the first thread length, said stop shoulder in conjunction with the second thread length defining a second ignition gap when the terminal stud is screwed into the threaded bush.

### Claim 2 (depends on 1)

The dynamo-electric machine of claim 1, wherein the threaded bush has a thread height and the terminal stud has a thread height which is identical to the thread height of the threaded bush.

### Claim 3 (depends on 1)

The dynamo-electric machine of claim 1, wherein the line is embodied as an energy supply line, a sensor line, or a data line.