Spiral staircase

Details Spiral staircase Spiral staircase

1983-11-28

1986-05-13

Friedman, Carl D.

Static structures (e.g., buildings)

Stepped; e.g., stair

Helical type

52182, 182 92, E04F 1100

Patent

active

045877807

ABSTRACT:
A spiral staircase comprising a central hollow column of circular cross-sectional shape and a plurality of treads, said column having a plurality of apertures in its wall spaced spirally, each said tread having a curved locking plate at its inner end which lies contiguous with the outer face of the column and a locking pin projecting radially inwardly from the locking plate and extending through a respective aperture in the wall of the hollow column, each said locking pin having surfaces defining an upwardly extending slot which accommodates portion of the column wall, one of said slot surfaces bearing against the inner face of the column thereby inhibiting tilting of that tread.

REFERENCES:
patent: 116441 (1871-06-01), Henley
patent: 485449 (1892-11-01), Borneman et al.
patent: 614177 (1898-11-01), McBride
patent: 874014 (1907-12-01), Kurtzon
patent: 3009719 (1961-11-01), Otto et al.
patent: 3902568 (1975-09-01), Erickson

Affiliated with

Also associated with

Rating

Spiral staircase does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Spiral staircase, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spiral staircase will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1763262