Portable spiral staircase

Details Portable spiral staircase Portable spiral staircase

1980-10-21

1983-04-05

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

With handrail or guard for ladder

182156, 52187, E06C 1383, A47C 912, E04F 1112

Patent

active

043788629

ABSTRACT:
A self-supporting helical staircase having an interconnected series of radial steps adapted to be swingably opened for providing vertically spaced horizontal support surfaces. The steps are angularly displaceable about a pintel post in progressive increments and are resiliently coupled for snap-lock engagement when in the fully extended position. A vertically extendible elongate handle is housed within the pintel post and can be locked at selected heights by a pressure clamp arrangement mounted at the upper end of the pintel post. The elongate handle can be folded about an articulated joint to a substantially horizontal position when in non-use. A sleeve member is slidable along the handle and can be positioned over the joint to provide vertical rigidity when the handle is to be used.

REFERENCES:
patent: 737197 (1903-08-01), Benney
patent: 750998 (1904-02-01), Ohnstrand
patent: 1215352 (1917-02-01), Duvinage
patent: 2010588 (1935-08-01), Gooden
patent: 3455414 (1969-07-01), Higgins

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