Support plug for a tubular roller sleeve

Abstract

A disk-shaped support plug (100) for a tubular roller sleeve comprises a first surface (101), a second surface on an opposite side of the support plug with respect to the first surface, a through hole (103) on the center of the support plug, and an outer rim surface (105) for being against an inner surface of the tubular roller sleeve. The outer rim surface (105) and a surface (104) of the through hole connect the first surface to the second surface. The first surface has recessions (106, 107) such that stiffener ridges (108, 109) are formed between the recessions. The stiffener ridges extend between different sectors of an outer rim area of the first surface so that the stiffener ridges bypass the through hole. Thus, the stiffener ridges conduct mechanical tensions to bypass a rim area of the through hole which is typically a fracture-prone area.

What is claimed is: 
     
         1 . A support plug for a tubular roller sleeve, the support plug being disk-shaped and comprising:
 a first surface,   a second surface on an opposite side of the support plug with respect to the first surface,   a through hole in a center of the support plug, a surface of the through hole connecting the first surface to the second surface, and   an outer rim surface connecting the first surface to the second surface and suitable for being against an inner surface of the tubular roller sleeve,   wherein the first surface has recessions such that stiffener ridges are formed between the recessions, and the stiffener ridges extend between different sectors of an outer rim area of the first surface so that the stiffener ridges bypass the through hole.   
     
     
         2 . A support plug according to  claim 1 , wherein the stiffener ridges cross each other. 
     
     
         3 . A support plug according to  claim 1 , wherein the first surface has an annular recession surrounding the through hole. 
     
     
         4 . A support plug according to  claim 1 , wherein the second surface has an annular ridge surrounding the through hole. 
     
     
         5 . A support plug according to  claim 1 , wherein the first surface has an annular recession on the outer rim area of the first surface. 
     
     
         6 . A support plug according to  claim 1 , wherein the second surface has an annular ridge on an outer rim area of the second surface. 
     
     
         7 . A support plug according to  claim 1 , wherein a part of the outer rim surface connected to the second surface has a bevel. 
     
     
         8 . A support plug according to  claim 1 , wherein a part of the second surface extending from an outer rim area of the second surface to an inner rim area of the second surface surrounding the through hole is conical with a cone angle at least 170 degrees and opening in a direction away from the first surface. 
     
     
         9 . A support plug according to  claim 1 , wherein depths of the recessions of the first surface are such that material thickness between bottoms of the recessions of the first surface and the second surface is constant. 
     
     
         10 . A support plug according to  claim 1 , wherein the outer rim surface comprises lumps to improve a grip between the support plug and the inner surface of the tubular roller sleeve. 
     
     
         11 . A support plug according to  claim 1 , wherein support plug is made of plastic. 
     
     
         12 . A support plug according to  claim 1 , wherein support plug is made of composite material comprising wood fibers and plastic. 
     
     
         13 . A support plug according to  claim 2 , wherein a part of the second surface extending from an outer rim area of the second surface to an inner rim area of the second surface surrounding the through hole is conical with a cone angle at least 170 degrees and opening in a direction away from the first surface. 
     
     
         14 . A support plug according to  claim 3 , wherein a part of the second surface extending from an outer rim area of the second surface to an inner rim area of the second surface surrounding the through hole is conical with a cone angle at least 170 degrees and opening in a direction away from the first surface. 
     
     
         15 . A support plug according to  claim 4 , wherein a part of the second surface extending from an outer rim area of the second surface to an inner rim area of the second surface surrounding the through hole is conical with a cone angle at least 170 degrees and opening in a direction away from the first surface. 
     
     
         16 . A support plug according to  claim 5 , wherein a part of the second surface extending from an outer rim area of the second surface to an inner rim area of the second surface surrounding the through hole is conical with a cone angle at least 170 degrees and opening in a direction away from the first surface. 
     
     
         17 . A support plug according to  claim 6 , wherein a part of the second surface extending from an outer rim area of the second surface to an inner rim area of the second surface surrounding the through hole is conical with a cone angle at least 170 degrees and opening in a direction away from the first surface. 
     
     
         18 . A support plug according to  claim 2 , wherein the second surface has an annular ridge on an outer rim area of the second surface. 
     
     
         19 . A support plug according to  claim 3 , wherein the second surface has an annular ridge on an outer rim area of the second surface. 
     
     
         20 . A support plug according to  claim 4 , wherein the second surface has an annular ridge on an outer rim area of the second surface.