E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
E04G3/00—Scaffolds essentially supported by building constructions, e.g. adjustable in height
E04G3/18—Scaffolds essentially supported by building constructions, e.g. adjustable in height supported by cantilevers or other provisions mounted in openings in the building, e.g. window openings
Escalier escamotable et pliable d'epaisseur tres faible, placable entre plancher et plafond, escalier s'appuyant sur une trappe, tubes supports, particules rabattable