# US 5,699,899 A · Electromechanical component, in particular a relay, having a sealed casing

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- Number: US 5,699,899 A
- Document ID: US5699899A
- Status: Granted
- Kind: A
- Application number: 08/602,811
- Filed: 1996-02-26
- Granted: 1997-12-23
- Earliest claimed: 1993-11-03
- Assignees: Siemens Aktiengesellschaft
- Inventors: Lutz Kahlbau
- Web page: https://patentgrep.com/patent/US5699899A

## CPC

- H01H 50/023: {Details concerning sealing, e.g. sealing casing with resin}
- H01H 2011/0081: {using double shot moulding, e.g. for forming elastomeric sealing elements on form stable casing}
- 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

The component has a casing base (1) which is coated with an elastomer layer (6; 9) in the region of apertures (4) and of an edge gap (15) between the casing base (11) and the cap (2). A good seal is thus produced, without any additional operations, when connecting elements (11) are pressed in or when the cap (2) is pressed on. The base can be produced from two plastics having different properties, using the two-component injection-molding method.

## Claims

### Claim 1

An electromechanical component, comprising:
a casing which is formed from a base and a cap, the base having apertures in which connecting elements are anchored and sealed by insertion;
the base, which is composed of a dimensionally stable plastic, being coated, at least in wall regions of the apertures, with a layer of a thermoplastic elastomer;
the connecting elements having a cross section, which is larger than a remaining width of respective apertures such that said connecting elements are anchored in a sealed manner by insertion of a respective connecting element into a respective aperture with a press fit;
one of the base and the cap being provided with a layer of elastomer in a region of an edge gap between the base and the cap;
the base forming a circumferential sealing edge which is coated with an elastomer layer having a U-shaped profile and which engages in a circumferential groove in the cap.

### Claim 2

An electromechanical component, comprising:
a casing which is formed from a base and a cap, the base having apertures in which connecting elements are anchored and sealed by insertion;
the base, which is composed of a dimensionally stable plastic, being coated, at least in wall regions of the apertures, with a layer of a thermoplastic elastomer;
the connecting elements having a cross section, which is larger than a remaining width of respective apertures such that said connecting elements are anchored in a sealed manner by insertion of a respective connecting element into a respective aperture with a press fit;
the base forming a circumferential sealing edge which is coated with an elastomer layer;
the elastomer coatings of a plurality of apertures and on the sealing edge being connected to one another via connecting webs composed of the elastomer material.

### Claim 3

An electromechanical component, comprising:
a casing which is formed from a base and a cap, the base having apertures in which connecting elements are anchored and sealed by insertion;
the base, which is composed of a dimensionally stable plastic, being coated, at least in wall regions of the apertures, with a layer of a thermoplastic elastomer;
the connecting elements having a cross section, which is larger than a remaining width of respective apertures such that said connecting elements are anchored in a sealed manner by insertion of a respective connecting element into a respective aperture with a press fit;
the cap having a circumferential sealing edge which is coated with an elastomer layer having a U-shaped profile and which engages in a circumferential groove in the base.

### Claim 4

A relay, comprising:
a relay system having connecting elements;
a casing which is formed from a base and a cap, the base having apertures in which the connecting elements are anchored and sealed by insertion;
the base being coated, at least in wall regions of the apertures, with a layer of a thermoplastic elastomer;
the connecting elements being a cross section, which is larger than a width of a respective aperture less a thickness of the thermoplastic elastomer in the respective aperture, such that said connecting elements are anchored in a sealed manner by the insertion of a respective connecting element into a respective aperture with a press fit;
one of the base and the cap having a layer of the elastomer in a region of an edge gap between the base and the cap, the base forming a circumferential sealing edge which is coated with an elastomer layer having a U-shaped profile and which engages in a circumferential groove in the cap.

### Claim 5

A relay, comprising:
a relay system having connecting elements;
a casing which is formed from a base and a cap, the base having apertures in which the connecting elements are anchored and sealed by insertion;
the base being coated, at least in wall regions of the apertures, with a layer of a thermoplastic elastomer;
the connecting elements being a cross section, which is larger than a width of a respective aperture less a thickness of the thermoplastic elastomer in the respective aperture, such that said connecting elements are anchored in a sealed manner by the insertion of a respective connecting element into a respective aperture with a press fit;
the base forming a circumferential sealing edge which is coated with an elastomer layer having a U-shaped profile and engages in a circumferential groove in the cap;
the elastomer coatings of one of a plurality of apertures and the sealing edge being connected to one another via connecting webs composed of the elastomer material.