Browse Prior Art Database

Publication Date: 2010-Dec-07
Document File: 17 page(s) / 84K

Publishing Venue

The Prior Art Database


The invention relates to a grommet to seal at least one wire. This grommet comprises - a cavity (13) having a central longitudinal axis, - an annular portion (14) extending radially inwardly in the cavity (13); - a flexible sleeve (S) extending, in a first axial direction, from said annular portion (14), and having an opening, close to a front end (17), a wall (19) having an inner face and an outer face in a rest condition of the sleeve (S), the wall (19) being locally designed adjacent to the annular portion (14) so that the sleeve is deformable near the annular portion (14) to enable the sleeve to be turned inside out during passage of a wire terminating member (15) through the opening in a second axial direction, opposite to said first axial direction, the inner face of the sleeve wall (19) facing the inner wall of the cavity in a turned out condition, the sleeve (S) further comprising an annular inner projection (20) projecting from the inner face. FIGURE 3

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Page 01 of 17



The invention relates to mat sealing joints for
connectors, also called "grommets", and connectors


including such a grommet.

Electrical and/or optical connectors and the like
are notably used for connecting apparatus or devices to one
another. Connectors may for example be of the type

10comprising an electrically insulating housing in which
electrical wires having electrical terminals and/or optical
fibres having ferules are inserted.

       Since it is undesirable that foreign bodies, such
as dust and liquids, penetrate inside the connectors, it is

20interfacial seal located between the housings of a
connector and of a counterpart connector.

       The invention relates more specifically to the kind
of seals arranged between housing and a grid, that is of
the grommet type. Such sealing joints exert sealing on each

       Grommets are made of any suitable soft material and
should avoid any abrasion or cut by electrical terminals or
optical ferules. For instance, electrical terminals are
typically made of metallic material, and can be aggressive


Page 02 of 17


during inserting of the electrical wires into the housing.

       US 4,697,861 already describes an electrical
connector for wires with a grommet adapted to be pressed
between two parts of the connector. The grommet comprises a
tubular portion with two flexible sleeves. Each flexible


sleeve has a substantially conical configuration normally
facing in one axial direction with an opening. Each sleeve
extends radially inwardly from the inner wall of the
tubular portion and can be turned inside out. The sleeves
are designed so that the surface in contact with the wire,

10cable or fibre surface, after having been turned inside out
should be different from the surface of the sleeves which
have been in contact with the aggressive part inserted
through the tubular portion. Accordingly, rear sealing
should be achieved even in case of high aggressiveness of

20effect of terminal aggressiveness with improved sealing
using a grommet and without complicating the connecting

       An advantage of some embodiments of the invention
is also to provide for grommets with more adaptation to

30wire. The grommet comprises a flange. The flange has an
inner wall which defines a cavity, with a central
longitudinal axis extending along the cavity. An annular
portion extends radially inwardly in the cavity. A flexible

Page 03 of 17


sleeve extends, in a first axial direction, from the
annular portion. This sleeve has a substantially
cylindrical or conical configuration, with a central
opening on its free end side, i.e. the sleeve side which is
not linked to the annular portion. For instance, for a


cone-shaped sleeve, the central opening is close to the
narrowest diameter side of the cone. This sleeve also has
a wall having an inner face and an outer face. "Inner" and
"outer" define the sleeve surface orientation, in a rest
condition of the sleeve, i.e. befor...