Method of manufacturing box ladders

Details Method of manufacturing box ladders Method of manufacturing box ladders

1992-03-10

1994-06-07

Rosenbaum, Mark

Metal working

Method of mechanical manufacture

Assembling or joining

B23P 1102

Patent

active

053177983

ABSTRACT:
A method of manufacturing box ladders having a pair of side rails and rungs wherein each of the side rails are assembled from a pair of section members having holes pre-formed prior to assembly of the side rail. The method provides reduced deformation in the manufacture of box ladders having cylindrical rungs and provides for the manufacture of box ladders having non-cylindrical shaped rungs.

REFERENCES:
patent: 2776080 (1957-01-01), Hopfeld
patent: 4219102 (1980-08-01), Ducresot et al.
patent: 4261436 (1981-04-01), Stillman, Jr.

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