Stairway stringers

Details Stairway stringers Stairway stringers

1977-11-03

1979-01-23

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Ladder

182 93, 182219, 182228, E06C 708, E06C 750, E06C 902

Patent

active

041355083

ABSTRACT:
A metal stairway stringer with horizontal slots at each tread level, into which the treads are inserted laterally for supporting them at one end, the other ends of the treads being similarly supported in like manner by a second stringer. The slots for the treads each taper from adjacent the open end at the edge of the stringer toward the back, so that the treads must be wedged into position and are therefore held rigidly by the stringer.

REFERENCES:
patent: 2003876 (1935-06-01), Birtcher
patent: 3090086 (1963-05-01), Fata

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