Curved staircase frame and method of making

Abstract

Abstract RIGHT-ANGLE BRACES ARE FORMED OF TWO SECTIONS OF ANGLE IRON MITERED TOGETHER. ONE LEG OF THE BRACE IS ADAPTED TO RECEIVE THE RISER OF A STAIR, AND THE OTHER LEG IS ADAPTED TO RECEIVE THE TREAD OF THE STAIR. A NUMBER OF THESE BRACES, EACH DESIGNED TO DEFINE ONE SIDE OF A STEP IN A CURVED STAIRCASE, ARE MOUNTED ON A FLAT METAL BAR TO FORM A FLAT STRING FOR THE STAIRCASE. A SIMILAR FLAT METAL BAR IS PLACED IN A JIG AT THE PITCH AND CURVATURE THE FINISHED STAIRCASE IS INTENDED TO ASSUME, AND THE FORMED STRING IS PLACED IN THE JIG WITH THE TWO FLAT BARS ENGAGING EACH OTHER THROUGHOUT THEIR LENGTHS. THE TWO BARS ARE THEN WELDED TOGETHER TO FORM A LAMINATION WHILE IN THE JIG TO PROVIDE THE CURVED HORSE FOR ONE SIDE OF THE STAIRCASE WITH THE LAMINATED BARS RETAINING THE DESIRED CURVE AND PITCH AFTER REMOVAL FROM THE JIG. ANOTHER METAL HOURSE IS SIMILARLY FORMED FOR THE OTHER SIDE OF THE STAIRCASE BUT IN A SEPARATE JIT OF DIFFERENT CURVATURE. AFTER THE TWO CURVED HORSES ARE INSTALLED, THE TREADS AND RISERS ARE ATTACHED TO A PAIR OF ASSOCIATED BRACES BY SCREWS INSERTED FROM BENEATH THE METAL FRAMES.

Inventors

• 👤 Adam J Cirgenski
• 👤 Vernon C Stiles

Bibliographic Details