Metal working – Method of mechanical manufacture – Structural member making
Patent
1990-09-19
1992-07-28
Scherbel, David A.
Metal working
Method of mechanical manufacture
Structural member making
29505, 29509, 298973, 52106, 52660, 52664, 52666, 52669, 49 50, 109 495, 109 79, 109 85, L04H 308, L04C 242, B23P 1100
Patent
active
051331233
ABSTRACT:
A security grating of the type comprising an openwork grid is described. It comprises horizontal bars and vertical rods. The rods pass through openings in the bars. At the each intersection between a bar and rod, a set of tabs locks the bars against movement relative to the rod. A method is described for making these rods from common, rolled round rod stock. A four element punch is employed to displace, or swage, the rod material outwardly to form the tabs in an economical manner.
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Downs Joanne C.
Scherbel David A.
Stewart-Decatur Security Systems, Inc.
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