# US 4,396,908 A · Electromagnetic warning instrument

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- Number: US 4,396,908 A
- Document ID: US4396908A
- Status: Granted
- Kind: A
- Application number: 06/257,021
- Filed: 1981-04-24
- Granted: 1983-08-02
- Earliest claimed: 1978-10-27
- Assignees: Klaxon S.A.
- Inventors: Bertrand A. Warnod
- Web page: https://patentgrep.com/patent/US4396908A

## CPC

- G10K 9/12: electrically operated
- G10K: SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR

## Abstract

An electromagnetic warning instrument has a housing equipped with at least one core carrying an operating electric coil, and a contact-breaker cooperating with a vibrating armature fast with a diaphragm. The coil is mounted on a printed circuit and electrically connected thereto. The printed circuit is mechanically fixed to the housing. The contact-breaker is mounted on the circuit by a mechanical connection which effects an electric connection. The printed circuit carrying the coil or coils can be assembled in advance, preferably by automatic means, then it is fixed on the housing, each coil being simply fitted on to the core. The fixing of the contact-breaker assembly then simultaneously ensures a supplementary mechanical connection for the printed circuit and the electric connection with the contact breaker.

## Claims

### Claim 1

An electromagnetic warning device comprising:
(a) a housing;
(b) a printed circuit mechanically fixed to said housing;
(c) at least one electromagnet having a core and coil mounted on said printed circuit, said coil being electrically connected to said printed circuit;
(d) an armature movable by said electromagnet;
(e) a diaphragm connected to said armature; and
(f) a contact-breaker mounted on said printed circuit by a mechanical connection which effects an electrical connection to said printed circuit.

### Claim 2 (depends on 1)

A warning device according to claim 1, wherein the coil is equipped with a flange of which there arrive the two wire ends of the coil and the printed circuit comprises flexible contacts cooperating with the said ends by fixing of the flange on the circuit.

### Claim 3 (depends on 2)

A warning device according to claim 2, wherein the printed circuit comprises a sleeve for fixing a coil and means for locking the coil on the sleeve.

### Claim 4 (depends on 3)

A warning device according to claim 3, in which the said locking means are of the bayonet type.

### Claim 5 (depends on 1)

A warning device according to claim 1, wherein the coil is equipped with two protuberances for fixing on which there respectively arrive the two coil wire extremities, and the coil is connected to the printed circuit by two mechanical conductor elements respectively connecting one extremity of the coil wire to a conductor of the printed circuit.

### Claim 6 (depends on 1)

A warning device according to claim 1, wherein two identical coils are provided each comprising a flange equipped with a lug and a receiver recess, the ends of the coil wire of each coil being brought on to their respective flanges, the lug of one coil being lodged in the recess of the other coil, conductors of the said printed circuit being soldered to the said extremities of the coil wire.

### Claim 7

An electromagnetic warning device comprising
a housing, a printed circuit board mechanically fixed to said housing,
a printed circuit on said board,
two identical electromagnets having identical cores and identical coils mounted on said printed circuit board, said identical coils being electrically connected to said printed circuit, wherein said two identical coils are provided each with a flange, and wherein each flange has a lug and a receiver recess, the ends of coil wires of the coils being fixed on their respective flanges, the lug of one coil being lodged in the recess of the other coil, conductors of the said printed circuit being soldered to the said ends of the coil wires,
and armature movable by said electromagnets,
a diaphragm connected to said armature, and
a contact-breaker mounted on said printed circuit board by a mechanical connection which effects an electrical connection to said printed circuit.