US2003200783A1PendingUtilityA1

Hollow tubular blank provided in wall thereof with one or more reinforcing ribs

11
Priority: Apr 26, 2002Filed: Apr 26, 2002Published: Oct 30, 2003
Est. expiryApr 26, 2022(expired)· nominal 20-yr term from priority
Inventors:Dean Shai
B21C 37/16B21K 1/02B21D 51/08
11
PatentIndex Score
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Claims

Abstract

A hollow metal tubular blank is provided in the wall with one or more reinforcing ribs which are formed by extrusion of the wall. The reinforcing ribs have an inner ridge and an outer ridge. The reinforcing ribs serve to enhance the structural strength of a retaining slot which is formed in the reinforcing portion of the wall of the blank.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
         1 . A hollow tubular blank made of a metal and provided in a predetermined position of a wall thereof with a reinforcing rib.  
     
     
         2 . The hollow tubular blank as defined in  claim 1 , wherein said reinforcing rib is formed by extrusion of the wall of one end of said metal tubular blank in a dieing machine whereby said reinforcing rib is formed of an inner ridge and an outer ridge.  
     
     
         3 . The hollow tubular blank as defined in  claim 2 , wherein said reinforcing rib can be formed in any position of the wall of said metal tubular blank by a design change in the dieing machine.

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