Stair step nosing

Abstract

A facing structure for a forward portion of steps of the stair ( 1 ) comprises a working member ( 2 ) made of a resilient material, a horizontal ( 4 ) and a vertical ( 3 ) fastening members connected to rearward ( 6 ) and lower ( 5 ) surfaces of the said working member ( 2 ). The thickness H of the working member and the modulus of elasticity E of a resilient material satisfy the relationships: H>h+h 1 , E≦H×k, where: h—the thickness of a facing material of the horizontal surface of stair steps [m], h 1 —the thickness of the horizontal fastening member [m], k=10 11 [n/m 3 ].

What is claimed is:  
     
         1 . A facing structure for a stair step forward portion comprising a working member made of a resilient material and a horizontal and a vertical fastening member, characterized in that the working member is manufactured in the form of a beam with its rearward and lower surfaces being connected to said horizontal and vertical fastening members respectively, wherein the thickness H of the working member and the modulus of elasticity E of a resilient material satisfy the relationships:  
         H>h+h   1 , E≦H×k,   
       where: 
 h—the thickness of a facing material of the horizontal surface of stair steps [m],  
 h 1 —the thickness of a horizontal fastening member [m],  
 k—the coefficient equal to  10   11 [n/m 3 ].  
 
     
     
         2 . A facing structure as set forth in  claim 1 , characterized in that the fastening members are made of the same material as that of the working member and, for example integral therewith.  
     
     
         3 . A facing structure as set forth in  claim 2 , characterized in that the fastening members are made integral with the working member.  
     
     
         4 . A facing structure as set forth in  claim 1 , characterized in that the fastening members are made of the material whose modulus of elasticity is at least by an order of magnitude greater then the modulus of elasticity of a resilient material of the working member.