Antiparallelogram folding structure, stroller, chair, pram, table trolley

A folding bearing structure comprising:

• a set of coplanar support points including at least two rear support points and at least one front support point;
• at least one folding device comprising
• a set of lower arms comprising at least one front lower arm and rear lower arm each comprising a first end, each being connected to one of the support points,
• a set of upper arms comprising at least one front upper arm and rear upper arm,
• a first antiparallelogram deformable in a vertical plane, said first antiparallelogram comprising two crossed segments with:
• a first end and a second end each being fixed by a first and a second attachment to a first end of the front lower arm and a first end of the rear lower arm respectively;
• a third end and a fourth end each being fixed by a third and a fourth attachment to a first point on the front lower arm and a first point of the rear lower arm respectively;
• at least one first sidebar located in a vertical plane, said first sidebar:
• being fixed by a fifth attachment by a first end of said first sidebar to the first end of the front lower arm;
• being fixed by a sixth attachment to the rear upper arm at a first upper point such that a length of the first sidebar is similar to a first segment formed by the second end and the third end of the antiparallelogram and approximately parallel to said first segment.
• a second sidebar, said second sidebar:
• being fixed by a seventh attachment by a first end of said second sidebar to the first end of the rear lower arm;
• being fixed by an eighth attachment to the front upper arm at a second upper point such that the length of the first sidebar is similar to a
• second segment formed by the first and the fourth ends of the
• antiparallelogram and approximately parallel to said second segment,
• wherein the first antiparallelogram deforms by folding between a first position corresponding to an unfolded position of the folding bearing structure and a second position corresponding to a folded position, a change from the first position to the second position reducing a wheelbase of the structure.