Articulated support with lateral movement for high-voltage or medium-voltage electrical plant

1. A support for high-voltage or medium-voltage electrical plant, comprising:

four columns adapted to be placed on a support surface and connected in pairs by crossmember assemblies, in which support said columns are each articulated to rotate about a first horizontal axis at their end resting on said support surface and about a second horizontal axis on a top crossmember at their other end, said first and second axes being parallel, and two opposite crossmember assemblies are adapted to allow the two columns connected by one or the other of said two assemblies to move in a stable manner in their rotation plane.

2. The support claimed in claim 1 , wherein said two opposite crossmember assemblies each comprise two crossing crossmembers whose uprights have on two corresponding columns a first articulation for rotation about a third axis perpendicular to the longitudinal axis of said columns.

3. The support claimed in claim 2 , wherein said two crossing crossmembers of said opposite crossmember assemblies each comprise an arrangement for modifying the distance between their two first rotational articulations.

4. The support claimed in claim 3 , wherein said two crossmembers of said opposite crossmember assemblies each comprise two crossmember sections connected end-to-end by a second articulation for rotation about an axis parallel to said third axis.

5. The support claimed in claim 3 , wherein said modification arrangement comprises a connecting arrangement allowing one end of said crossmember to move relative to the corresponding column.

6. The support claimed in claim 5 , wherein said connecting arrangement comprises a longitudinal slot on said crossmember and through which said first rotation articulation passes.

7. The support claimed in claim 3 , wherein said modification arrangement comprises an arrangement for adjusting the length of said crossmember.

8. The support claimed in claim 7 , wherein said arrangement for adjusting the length of said crossmember is a turnbuckle.

9. The support claimed in claim 2 , wherein the two crossmembers of said opposite crossmember assemblies are connected together by a connecting arrangement allowing their relative movement.

10. The support claimed in claim 9 , wherein said connecting arrangement comprises a longitudinal slot on each of said crossmembers and a clamping member passing through both said slots.

11. The support claimed in claim 1 , wherein said two crossmember assemblies are symmetrical with respect to a vertical plane of symmetry of said support.

12. Shielded electrical plant housed in a metal enclosure and comprising a substantially horizontal first unit and, at one end at least of said first unit, a second unit carried by a support as claimed in claim 1 .

13. The plant claimed in claim 12 , wherein said first unit is a circuit-breaker.