The structure comprises two support uprights (11), a horizontal crosspiece (12) for connecting the uprights, and an oscillating seat (13) suspended from supports (14) fixed to the crosspiece. Each upright (11) consists of two feet (15) assembled to each other and to the crosspiece (12) by means of a bolt (16), which diverge downwards and are connected at an intermediate height by at least one spacer (17), the ends of which are inserted into branches (15 ') of said feet, in which they are locked by means of an anti-sliding lug (17') and pins (20). The feet (15) of each upright (11) are rigidly connected (32,114,131) to an adjacent support (14) for suspension of the oscillating seat, fixed to the cross-member.
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