# US 5,352,999 A · Electromagnetic relay and method of adjusting same

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- Number: US 5,352,999 A
- Document ID: US5352999A
- Status: Granted
- Kind: A
- Application number: 08/160,196
- Filed: 1993-12-02
- Granted: 1994-10-04
- Earliest claimed: 1992-12-23
- Assignees: Hella KG Hueck & Co.
- Inventors: Wolfgang Hoffmann; Andre Korner; Maik Zimmer
- Web page: https://patentgrep.com/patent/US5352999A

## CPC

- H01H 50/54: Contact arrangements
- B23K 26/21: by welding
- H01H 50/14: Terminal arrangements {(for coils H01H50/443)}
- H01H 2011/0075: {calibrating mechanical switching properties, e.g. "snap or switch moment", by mechanically deforming a part of the switch, e.g. elongating a blade spring by puncturing it with a laser}
- H01H 2011/0087: {Welding switch parts by use of a laser beam}
- H01R 43/02: for soldered or welded connections
- 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)
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- H01R: ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS

## Abstract

An electromagnetic relay having an uncomplicated and cost-effective construction includes a switching contact spring (5) that is adjustable in a particularly uncomplicated manner for controlling actuation sensitivity. In this manner, in particular, actuation can be influenced by a value of a minimum attraction voltage.

## Claims

### Claim 1

An unadjusted, and therefore unfinished, electromagnetic relay comprising:
a base plate;
a plurality of terminal tongues extending through and engaging said base plate;
an armature;
a switching contact spring mechanically attached to the armature for supporting the armature with a first portion of the switching contact spring having at least one movable switch contact thereon;
wherein a second portion of the switching contact spring has a coupling element coupled to a portion of a contact terminal tongue, said coupling element providing a mechanical as well as an electrical connection with said portion of said contact terminal tongue, said coupling element being formed as a spring clamping mechanism for allowing sliding contact between said spring clamping mechanism and said contact terminal tongue for allowing sliding contact between said spring clamping mechanism and said portion of said contact terminal tongue in a direction for properly adjusting a sensitivity of movement of said movable switch contact, said coupling element including a means for affixing it to the portion of the terminal tongue at a correctly adjusted position.

### Claim 2 (depends on 1)

An electromagnetic relay as in claim 1 wherein said means for affixing is deformed material produced by a welding process.

### Claim 3 (depends on 2)

An electromagnetic relay as in claim 2 wherein said means for affixing is deformed material produced by a laser welding process.

### Claim 4

A process for the adjustment of components of a relay of a type having a base plate with a plurality of terminal tongues extending therethrough, with a normally-open contact tongue thereof supporting a normally-open contact and having a substantially L-shaped bend therein, a switching contact spring including a switch contact and an armature attached thereto, and a magnetic system comprising a magnetic coil, a coil core, and a yoke, said process involving adjustment of the position of the switching contact spring and including the steps of:
providing a coupling element that is coupled to the switching contact spring;
slidably placing the coupling element on a portion of one of the terminal tongues;
placing a characteristic attraction voltage on the magnetic coil of the relay;
monitoring movement of the armature relative to the coil with a measuring device;
shoving the coupling element along the portion of the one of the terminal tongues until there is a predetermined movement of the armature relative to the coil; and
issuing a signal from said measuring device in response to its detecting the predetermined movement of the armature relative to the coil to a welding apparatus which, in response thereto, welds the switching contact spring in its present position to the portion of the terminal tongue.

### Claim 5 (depends on 4)

A process as in claim 4 wherein the measuring device is in circuit between two terminal tongues which monitors if an electrical connection exists between the normally-open contact and the switch contact.

### Claim 6 (depends on 4)

A process as in claim 4 wherein the welding of the coupling element to the portion of the terminal tongue is done with a laser welding apparatus.