Tunnel for raising seeds - has deformable parallelogram base frame with arches connected between long sides

摘要

The tunnel frame comprises a metal frame having two long parallel horizontal sides and ends which are hinged together on a vertical axis so as to provide a deformable parallelogram. Equispaced arches are mounted on the long sides. A covering is welded or sewn on in order to conform exactly to the metal frame. The covering may have eyelets which can be engaged by the legs of the arches. Stakes pivoting on the long sides can anchor the frame or support one side above the ground for ventilation.