(57) A spring device for a support rod (5), in particular for curtains, in which said
rod comprises a first tubular element (3) and a second tubular element (4), said second
tubular element (4) being arranged to be inserted into and to slide at least partially
telescopically within said first element (3) such as to enable the rod length to be
adjusted, said device comprising a spring (1) to be inserted into the rod (5) and
arranged to exert an axial elastic force (F1, F2) which causes one tubular element
of the rod to withdraw from the other, an element (2) for adjusting the spring (1)
being provided comprising a body (7) having a first elongate portion (7A) presenting
a spiral shaped seat (8) shaped to be able to house in its interior a plurality of
turns of the spring (1), said body (7) being arranged to be at least partially housed
in an end portion (4B) of said second tubular element (4), said body (7) enabling
the length of that portion of the spring (1) projecting from said second tubular element
(4) to be adjusted, to be then inserted into the other tubular element (3).
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