E - Fixed Constructions – 06 – C
Patent
E - Fixed Constructions
06
C
26/111, 228/14
E06C 7/08 (2006.01)
Patent
CA 1136104
HAROLD W. STILLMAN METAL LADDER AND METHOD OF FABRICATING THE SAME File No. 86-512 ABSTRACT OF THE INVENTION A metal ladder is fabricated from a pair of spaced rails in which the rails have web portions which are provided at spaced intervals with inwardly directed embossments. Each of these embossments has an opening into which one end of a tubular rung is inserted and swaged to the rail. The embossments act as ribs to carry the load toward the flanges constituting the stiffer portions of the rail thereby increasing the strength and effec- tively reducing the web flexure and angle changes between the rungs and the rails, due to sideward forces in ladder use. By reason of the built in stiffness web thickness may be reduced resulting in savings in materials. Additionally, intermediate these embossments, just described, the web portion of each rail is formed with one or more outwardly directed embossments.
346470
Pascal & Associates
Sears Roebuck And Co.
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