Step stone for a stairway and a stairway assembled therefrom

Abstract

The invention relates to a step stone for a stairway comprising an upper essentially horizontal stepping surface, a front essentially vertical setting surface, a rear back surface, which is located opposite the setting surface and which, with the stepping surface, forms an upper rear edge, and comprising an underside. A supporting section with a recess is provided in the front area of the underside of the step stone, whereby said recess enables the step stone to be supported on a step stone located directly underneath in order to form a stairway. To this end, the supporting section has a number of stepped recesses, which are offset with respect to one another and with which the step stone can be placed as desired onto the rear edge of the step stone located directly underneath.

1 . Step stone for a stairway comprising an upper substantially horizontal stepping surface ( 11 ), a front substantially vertical setting surface ( 12 ), a rear back surface ( 13 ) opposite to the setting surface ( 12 ) which, together with the stepping surface ( 11 ), forms an upper rear edge ( 18 ) and with an underside ( 14 ), wherein a supporting section ( 15 ) is formed in the front region of the underside ( 14 ) of the step stone ( 10 ), the supporting section ( 15 ) having several stepped mutually displaced recesses ( 16 ) with which the step stone ( 10 ) can optionally be disposed onto the rear edge ( 18 ) of an underlying step stone to construct a stair way, wherein the base point lines ( 16   e ) of the cross-sections of the recesses ( 16 ) are disposed in a plane (A) which extends at an angle β with respect to the horizontal stepping surface ( 11 ) and which slopes upwardly towards the front setting surface ( 12 ) of the step stone ( 10 ), characterized in that the angle β is in a range between 25° and 30°, wherein a further supporting section ( 20 ) is formed in the rear region of the underside ( 14 ) of the step stone ( 10 ) which has several stepped recesses ( 21 ) whose base point lines ( 21   a ) are in one plane (B) extending at an angle β with respect to the horizontal stepping surface ( 11 ) and rising towards the rear back surface ( 13 ) of the step stone ( 10 ).  
     
     
         2 . Step stone according to  claim 1 , characterized in that the angle β is between 25° and 28°.  
     
     
         3 . Step stone according to  claim 1  or  2 , characterized in that the opening cross-sections of the recesses ( 16 ) are disposed in a plane (X) extending at an angle α with respect to the horizontal stepping surface ( 11 ) and sloping upwardly towards the front setting surface ( 12 ) of the step stone ( 10 ).  
     
     
         4 . Step stone according to  claim 3 , characterized in that the angle α is between 25° and 28°.  
     
     
         5 . Step stone according to any one of the claims  1  through  4 , characterized in that the rear edge ( 18 ) of the step stone ( 10 ) has a cross-section which is complementary to the cross-section of each recess ( 16 ).  
     
     
         6 . Step stone according to any one of the claims  1  through  5 , characterized in that each recess ( 16 ) is defined by an upper covering surface ( 16   a ) and a rear stop surface ( 16   b ).  
     
     
         7 . Step stone according to  claim 6 , characterized in that the rear edge ( 18 ) has a rectangular cross-section and the covering surface ( 16   a ) of each recess ( 16 ) extends substantially horizontally with the stop surface ( 16   b ) extending substantially vertically.  
     
     
         8 . Step stone according to  claim 6  or  7 , characterized in that the length l of the covering surface ( 16   a ) is substantially twice as large as the height h of the stop surface ( 16   b ).  
     
     
         9 . Step stone according to any one of the claims  6  through  8 , characterized in that a depression ( 17 ) is formed at the rear end of the stepping surface ( 11 ) into which a nose ( 19 ) formed on the covering surface of each recess ( 16 ) can be inserted.  
     
     
         10 . Step stone according to  claim 9 , characterized in that the depression ( 17 ) and the nose ( 19 ) have complementary cross-sections.  
     
     
         11 . Step stone according to  claim 9  or  10 , characterized in that the depression ( 17 ) and the nose ( 19 ) have inclined sliding surfaces ( 16   d ,  17   a ) and associated support surfaces ( 16   c ,  17   b ).  
     
     
         12 . Step stone according to any one of the claims  1  through  11 , characterized in that it is a prefabricated concrete part.  
     
     
         13 . Step stone according to any one of the claims  1  through  12 , characterized in that it has a constant cross-section throughout its entire width.  
     
     
         14 . Step stone according to any one of the claims  1  through  13 , characterized in that the side walls ( 22 ,  23 ) connecting the front setting surface ( 12 ) and the rear back surface ( 13 ) do not extend parallel to each other.  
     
     
         15 . Step stone according to  claim 14 , characterized in that its width is continuously reduced from the front setting surface ( 12 ) to the rear back surface ( 13 ).  
     
     
         16 . Step stone according to any one of the claims  1  through  15 , characterized in that its side walls bear projecting engagement elements for engagement into recesses of a neighboring step stone.  
     
     
         17 . Stairway of step stones according to any one of the claims  1  through  16 , wherein an upper step stone is supported with one of the recesses ( 16 ) of its supporting section ( 15 ) on an underlying step stone and several step stones are disposed next to one another to form one step, characterized in that the step stones taper conically from the front setting surface ( 12 ) towards the rear back surface ( 13 ) and are disposed next to each other with a same conical orientation to form a curved step.  
     
     
         18 . Stairway of step stones according to any one of the claims  1  through  16 , wherein an upper step stone is supported with one of the recesses ( 16 ) of its supporting section ( 15 ) on an underlying step stone and several step stones are disposed next to one another to form one step, characterized in that the step stones taper conically from the front setting surface ( 12 ) towards the rear back surface ( 13 ) and are disposed next to each other with alternating conical orientation to form a straight step.  
     
     
         19 . Stairway according to  claim 17  or  18 , characterized in that the step stones which are disposed next to each other are mutually engaged via laterally projecting engagement elements.