# US 5,703,549 A · Relay with a movable assembly having a dampening effect

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- Number: US 5,703,549 A
- Document ID: US5703549A
- Status: Granted
- Kind: A
- Application number: 08/383,513
- Filed: 1995-02-03
- Granted: 1997-12-30
- Earliest claimed: 1994-02-04
- Assignees: Bitron S.P.A.
- Inventors: Guido Guidi; Giampaolo Boezi; Pietro De Filippis
- Web page: https://patentgrep.com/patent/US5703549A

## CPC

- H01H 50/305: {damping vibration due to functional movement of armature (in air-gap H01H50/163)}
- H01H 50/546: {for contactors having bridging contacts}
- H01H 1/18: with subsequent sliding
- H01H 1/225: {the supporting member being pivotable}
- H01H 1/24: with resilient mounting
- H01H 1/50: Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
- H01H 1/5822: {Flexible connections between movable contact and terminal}
- H01H 50/60: moving contact being rigidly combined with movable part of magnetic circuit {(for polarised relays H01H51/2254, H01H51/2281)}
- 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 relay for use particularly in motor vehicles has a stable ferromagnetic core, an excitation coil wound around the core and a movable assembly, composed by a movable ferromagnetic armature, connected to a blade carrying an electric contact. The blade is movable with respect to the armature and has a fulcrum in an appropriate seat obtained in the armature. The blade is constrained to the armature in an elastic fashion, but is suitable to produce a damping effect on the bouncing phenomenon. The relay also has a return spring to maintain the assembly in a position of maximum air gap with respect to the stable core, when the device is in a release condition, whereby a leaf spring is provided, being fixed in a predetermined point of the movable armature, which constrains for elastic reaction the movement of the movable blade and maintains the desired pressure contact on the electric contact.

## Claims

### Claim 1

A relay suitable for use in a motor vehicle comprising:
a ferromagnetic core;
an excitation coil surrounding said core;
an armature assembly mounted so as to be movable relative to said core and comprising:
an armature juxtaposed with said core and attracted toward said core from a position in which said armature forms a maximum gap with said core, said armature having a recess at an end thereof,
a bent blade having one end formed as a fulcrum and engaged in said recess and an opposite end formed as a movable contact, a leaf spring having one end bearing upon said blade and overlying said blade, and means for anchoring said leaf spring at a location spaced from said end of said leaf spring to said armature,
a coil spring acting upon an opposite end of said armature for drawing said armature into said position; and
a pair of fixed contacts straddling said movable contact and selectively engaged by said movable contact upon excitation and de-excitation of said coil with pivoting of said blade about said fulcrum and damping of bounce by said movable contact with said leaf spring.

### Claim 2 (depends on 1)

The relay defined in claim 1 wherein said leaf spring has a pair of lateral guides and said blade has respective shoulders received in said guides.

### Claim 3 (depends on 2)

The relay defined in claim 2 wherein said for anchoring includes at least one projection formed on said armature and at least one hold formed in said leaf spring and fitted over the projection.