A device intended to materialize limits perpendicular to the existing or for carrying out, which can be used in particular in the work of the building, construction or do-it-yourself

摘要

The yarn is divided into three segments, forming a right angled triangle. When the two perpendicular sides and the hypotenuse satisfy the Pythagoras relationship, a right angle may be established for building and construction works. The device comprises a flexible and non-elastic yarn (1) divided into lengths by three retaining elements fixed at predetermined locations. The retaining elements are mounted on fixings, the diameter of each fixing being equal to the internal diameter of the retaining element. This positions the yarn along a direction which is perpendicular to the axes of the fixings. The yarn defines a triangle linking together the three retaining elements on which it is supported. When the triangle is defined, the two perpendicular sides and hypotenuse are related by Pythagoras theorem, thus enabling the establishment of a right angle. The yarn may be extended from a casing in order to provide the triangle, or retracted when not in use.