Stairway for Use on Building Sites

Abstract

The invention is a portable, modular stairway unit for use on a building site during construction of a multistorey building, the stairway unit including: a stair run section with a plurality of rise-separated stair treads, the stair run section having an upper and a lower end; an upper landing connected to the stair run section at, or at a distance from, the upper end of the stair run section; a lower landing connected to the stair run section at, or at a distance from, the lower end of the stair run section; wherein each of the landings have portions that extend laterally beyond a width of the stair run section, the landings being devised to extend inwardly into respective upper and lower storey levels of the building when the stairway unit is situated adjacent to a face of the building; and anchoring means arranged to removeably secure the landings, in use, at the upper and lower storey levels thereby to provide a double-cantilevered mounting of the stair run section extending between the two building storey levels.

1 . A portable, modular stairway unit for use on a building site during construction of a multistorey building, the stairway unit including:
 a stair run section with a plurality of rise-separated stair treads, the stair run section having an upper and a lower end;   an upper landing connected to the stair run section at, or at a distance from, the upper end of the stair run section;   a lower landing connected to the stair run section at, or at a distance from, the lower end of the stair run section;   wherein each of the landings have portions that extend laterally beyond a width of the stair run section, the landings being devised to extend inwardly into respective upper and lower storey levels of the building when the stairway unit is situated adjacent to a face of the building; and   anchoring means arranged to removeably secure the landings, in use, at the upper and lower storey levels thereby to provide a double-cantilevered mounting of the stair run section extending between the two building storey levels.   
     
     
         2 . The stairway unit according to  claim 1 , wherein at least one of the landings is pivotably secured to the stair run section in such a manner as to allow the incline of the stair run section to be varied with respect to the at least one landing. 
     
     
         3 . The stairway unit according to  claim 2 , wherein each of the landings is hinged to the respective ends of the stair run section. 
     
     
         4 . The stairway unit according to  claim 1 , wherein at least one of the landings is secured to the stair run section in such a manner as to allow linear movement along a longitudinal axis of the stair run section, and further including fixing means to secure the landing at a desired position along the stair run section, whereby a distance between the upper and lower landings of the stair run section can be varied and fixed at desired positions. 
     
     
         5 . The stairway unit according to  claim 4 , wherein the lower landing is arranged to be held at a fixed angle of inclination with respect to the longitudinal axis of the stair run section. 
     
     
         6 . The stairway unit according to  claim 4  or  5 , wherein the stair run section includes discrete fastening points spaced apart along the longitudinal extension of the stair run section. 
     
     
         7 . The stairway unit according to any one of the above claims, further including means to secure the upper landing at a predetermined angle with respect to the stair run section. 
     
     
         8 . The stairway unit according to  claim 7 , wherein the predetermined angle is from about 26.5° to 45° from the horizontal.