The present invention relates to a connection device comprising a
double contact, in particular for medium voltage applications ; it is used, in
particular, in bus bar systems, which are ever more frequently being used in the
distribution of power currents for industrial and in-house applications. There
is a need, in particular in power current distribution boxes, to be able to connect
at will different conductors called bus bars, or to be able rapidly to disassemble
The present invention has the object of making available a connection
device comprising a double contact between two distant fixed parts, in particular
for medium voltage applications, which will be easy to connect, without moving
the two fixed parts and which will be easy to disassemble.
The invention moreover relates to a process for making an electrical
connection by the use of such a connection device.
This object is achieved by means of a connection device comprising
a fixing bracket possessing at least two interior, plane, parallel surfaces, being
part of a first electrical connection part, a plug connector in the shape of a
lance being part of a second connection part and an elastic connection clip bent
into the shape of a horseshoe, with branches whose outside surfaces on the widest
part of the horseshoe are in press contact with the interior, plane, parallel
surfaces of the fixing bracket, whose free ends provide pinch grip on the plug
According to a preferred embodiment, the fixing bracket with the
interior plane parallel surfaces is U-shaped.
According to another preferred embodiment, the connection clip is
a bent metal strip, whose free ends are bent towards the interior, in order to
facilitate its introduction on the plug connector.
According to yet another preferred embodiment, the branches of the
connection clip are provided with slots along their longitudinal axis.
According to still another preferred embodiment, the plug connector
comprises a sheet folded backwards with respect to the direction of insertion
of the clip, in order to double its thickness.
According to a preferred embodiment, the fixing bracket and the plug
connector are fixed and contact is made by the insertion of the horseshoe-shaped
connection clip into the fixing bracket, until the connection clip is at the plug
contact in the connection position.
Moreover, contact between the free ends of the connection clip and
of the plug connector is only established when the connection clip has been partially
inserted between the parallel surfaces of the fixing bracket.
The connection clip can have on its base a flat blade terminal for
its manipulation during insertion. This flat blade terminal may be integral with
the connection clip, or it can be made from a piece of injection-moulded plastic.
The use of this type of connection device is more particularly suitable for making
a connection between two parts of a bus bar system. The particular advantage of
the invention is its use in the manufacture of bus bars destined for a distribution
box of medium voltage current.
The invention also relates to a process for making an electrical
Below, the invention is described more exactly with the help of an
embodiment example and with reference to diagrams.
- Fig. 1
- is a perspective representation of parts to be connected in a bus bar system
using a connection clip, and
- Fig. 2
- shows the insertion of a connection clip into the connection device described
in three steps.
Fig. 1 shows a cross-section of a first connection part 2. This part
can be comprised in a conductor of a bus bar system. On the said part 2 is a fixing
bracket 1, which may be U-shaped. This fixing bracket 1 comprises two arms with
two interior, plane, parallel surfaces 9 and linked together by means of the base
of the U.
Fig. 1 also shows a second connection part, for example another conductor
of a bus bar system ; a plug connector 3 is integral with the said second connection
Fig. 1 represents the connection clip 5 inserted. The connection clip
5 is a horseshoe-shaped conducting metal element and has two branches 7 bent towards
the outside at their ends, in order to acquire a flared shape to facilitate insertion
on the connection plug 3, the distance between the two branches 7 at its shortest
being slightly less than the thickness of the plug connector 3 which allows grip
on the plug 3 when the connection clip 5 is introduced.
When the clip is inserted in a longitudinal median axis, the free
ends 6 of the branches 7 of the connection clip are elastically separated by the
plug connector 3 in such a way that the clip tends to be deflected and therefore
becomes pressed between the parallel surfaces 9 of the arms of the fixing bracket
The connection clip is therefore pressed into the interior of the
fixing bracket 1 between the two plane parallel surfaces, where it is subjected
to a perpendicular force in the centre plane and directed towards the interior,
the clip also being pushed on the plug connector 3 where it is subjected to a perpendicular
force in the centre plane and directed towards the exterior.
In order to improve the electrical contact between the connection
clip 5 and the plug connector 3 in connection position, the branches 7 of the
connection clip 5 have along their longitudinal median axis, longitudinal slots
8. Owing to this, the surface of contact between the connection clip 5 and the
inserted plug connector 3 will be increased.
Fig. 2 shows the insertion into the connection clip 5 between he
first connection part 2 and the second connection part 4, located in positions
which are fixed to one another. It can be seen that the plug connector 3 in a connection
position is disposed along a median longitudinal axis between the parallel surfaces
9 of the U-shaped fixing bracket 1. The direction of insertion of the connection
clip 5 is the same as the direction of the said median longitudinal axis. The
centre figure shows the connection clip 5 partially inserted to where the clip
starts to be pressed into the U-shaped fixing bracket following the elastic tightening
of the branches 7 of the connection clip 5 on the plug connector, perpendicularly
to the direction of insertion. The connection clip 5 with its free ends 6 enters
into contact with the end of the plug connector 3, the latter is gripped between
the two elastic branches 7 of the connection clip 5. The diagram on the right of
Fig. 2 shows the connection clip 5 in its final position, where contact is established
between parts 2 and 4. Owing to the sliding of the contact surfaces of the connection
clip 5 on the interior surfaces of the U-shaped bracket 1 on the one hand and
the external parts of the plug connector 3, a self-cleaning effect of the contact
surfaces is simultaneously created, which improves the specific lowresistance of
the connection device. On the base of the horseshoe-shaped connection clip is applied
a flat blade terminal 10, with the help of which the insertion and guidance of
the connection clip 5 can be facilitated.
The invention also relates to a process for establishing an electrical
connection between two connection parts 2 and 4 fixed with respect to one another,
the first connection part comprising a fixing bracket 1 and the second connection
part comprising a plug connector 3, in which the connection is provided by the
moving of a metal clip 5 between the two connection parts, the clip being pressed
between the parallel surfaces of the fixing bracket 1 of the first part 2 and
being gripped on the plug connector 3 of the second connection part 4 by means
of its elastic branches 7. The insertion of the clip is achieved by a pushing force,
which is reduced by reason of the fact that the movement of the elastic branches
7 does not take place until after the positioning of the clip in the fixing bracket
of the first connection part 1.
When it is inserted, the connection clip 5 is first surrounded by
the fixing bracket 1 before it comes into contact with the plug connector 3 and
grips it between its free ends 6.
The foregoing description is only one example of the embodiment of
the present invention and is for illustration only ; it cannot be interpreted
in a restrictive manner.