Adjustable sheet metal moulds for steel and precast concrete...

B - Operations – Transporting – 28 – B

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B28B 7/22 (2006.01) E04F 11/02 (2006.01)

Patent

CA 2155394

Sheet steel pan forms bent or rollformed to specific "universal" profiles allow the manufacture of concrete tread filled steel stairs or precast concrete stairs. The profiles adjust against each other under the specific angle of 26.565° and thereby, used in series, create stairways of various rise and run relations, maintaing the same profile at all times, satisfying requirements of all building codes and follow the measure of the human step on an incline. These "universal" profiles are designed to standardize stair construction, save labor and material and produce stairs more economically than conventional methods employed in today's construction industry.

La présente invention a pour objet des plaques en tôle d'acier obtenues par pliage ou par profilage et permettant la réalisation de girons de marches d'escaliers préfabriquées en acier profilé rempli de béton. Les plaques profilées forment, les unes par rapport aux autres, un angle spécifique de 26.565 degrés, permettant ainsi, de par leur utilisation en série, la construction d'escaliers présentant divers rapports de hauteur de marche et de profondeur du giron en conservant toujours le même profil, en conformité avec les normes et les exigences formulées dans tous les codes du bâtiment, et tout en respectant l'aspect ergonomique du déplacement humain sur un plan incliné.

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