Grating

Abstract

Hitherto known gratings for covering shafts, channels or similar structures comprise peripheral rails ( 10, 10′ ) cross-bars ( 20 ) that are joined to the peripheral rails ( 10, 10′ ) and consist of sheet metal sections, and longitudinal bars ( 30 ) joined to the cross-bars ( 20 ). In order to provide a better foothold and improved anti-skid properties, the longitudinal bars ( 30 ) are secured to the cross-bars ( 20 ) in such a way that top stepping surfaces ( 31 ) of the longitudinal bars ( 30 ) are lower than or flush with at least stepping portions ( 21 ) of upper edges ( 22 ) of the cross-bars ( 20 ).

1 - 13 . (canceled) 
     
     
         14 . A grating for covering shafts, channels or similar structures, comprising
 peripheral rails ( 10 ,  10 ′)   cross-bars ( 20 ) made of sheet metal sections connected to the peripheral rails ( 10 ,  10 ′),   longitudinal bars ( 30 ) connected to the cross-bars ( 20 ),   characterized in that the longitudinal bars ( 30 ) are fixed to the cross-bars ( 20 ) in such a way that upper stepping surfaces ( 31 ) of the longitudinal bars ( 30 ) extend lower than or flush with at least stepping sections of upper edges ( 22 ) of the cross-bars ( 20 ).   
     
     
         15 . The grating according to claim  1 , characterized in that the longitudinal bars ( 30 ) have essentially U-shaped cross-sections with the upper stepping surfaces ( 31 ) and with shanks ( 32 ,  32 ′) fixed in the cross-bars ( 20 ), with the cross-bars preferably projecting upwards over the stepping surfaces ( 31 ). 
     
     
         16 . The grating according to claim  3 , characterized in that the peripheral rails ( 10 ,  10 ′) have slots ( 11 ), into which ends ( 23 ,  23 ′) of the cross-bars ( 20 ) are inserted. 
     
     
         17 . The grating according to claim  3 , characterized in that the peripheral rails ( 10 ,  10 ′) are formed as sheet metal hollow profiles. 
     
     
         18 . The grating according to claim  4 , characterized in that the ends ( 23 ,  23 ′) of the cross-bars ( 20 ) are bent inside the peripheral rails ( 10 ,  10 ′) in such a way that the cross-bars ( 20 ) are fixed to the peripheral rails ( 10 ,  10 ′). 
     
     
         19 . The grating according to claim  3 , characterized in that the cross bars ( 20 ) have stop sections ( 25 ) situated before the ends ( 23 ,  23 ′) so that the ends ( 23 ,  23 ′) can be inserted into the peripheral rails ( 10 ,  10 ′) up to a defined insertion depth. 
     
     
         20 . The grating according to claim  2 , characterized in that the cross bars ( 20 ) have slots ( 24 ) for receiving the shanks ( 32 ,  32 ′) of the longitudinal bars ( 30 ) and the shanks ( 32 ,  32 ′) are pressed into these slots ( 24 ). 
     
     
         21 . The grating according to claim  4 , characterized in that the peripheral rails ( 10 ,  10 ′) have bearing surfaces ( 12 ) for bearing on corresponding sections of the structures, and lower edges ( 26 ) of the ends ( 23 ,  23 ′) of the cross-bars ( 20 ) bear on inner surfaces ( 13 ) of the bearing surfaces ( 12 ). 
     
     
         22 . The grating according to one claim  2 , characterized in that the stepping sections ( 21 ) of the cross-bars ( 20 ) have sharp-edged engagement edges ( 27 ) opposite rounded transition areas ( 33 ,  33 ′) between the shanks ( 32 ,  32 ′) and the stepping surfaces ( 31 ) of the longitudinal bars ( 30 ). 
     
     
         23 . The grating according to claim  1 , characterized by brackets ( 40 ) which are connected to the peripheral rails ( 10 ,  10 ′) in order to fix the grating in the structure. 
     
     
         24 . The grating according to claim  10 , characterized in that the brackets ( 40 ) have upper spring sections ( 41 ), by means of which they can be inserted under tension into openings ( 14 ) of the peripheral rails ( 10 ,  10 ′) and can be fixed in the peripheral rails ( 10 ,  10 ′) preferably in a form fitting manner. 
     
     
         25 . The grating according to claim  1 , characterized in that the peripheral rails ( 10 ,  10 ′) have rod elements ( 15 ) projecting downwards, which are formed for insertion into corresponding recesses in the structure and for prevention of a longitudinal displacement of the grating relative to the structure. 
     
     
         26 . The grating according to claim  1 , characterized in that the peripheral rails ( 10 ,  10 ′) have access openings ( 16 ,  16 ′) on the outside such that ends ( 23 ,  23 ′) of the cross-bars ( 20 ) can be accessed from the outside by tools for connection of the cross-bars ( 20 ) to the peripheral rails ( 10 ,  10 ′).