Static structures (e.g. – buildings) – Processes – Requiring soil work
Patent
1980-10-27
1983-11-08
Friedman, Carl D.
Static structures (e.g., buildings)
Processes
Requiring soil work
52187, E04F 1100
Patent
active
044134606
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a do-it-yourself spiral staircase with a central column made of a hollow steel tube, which extends between the base support on a lower floor and a landing plate or end tread on an upper floor of a dwelling or office building.
Spiral staircases are known, wherein the central columns are made of an integral steel tube, with a screw nut welded into its head portion. In order to secure the central column to the landing plate or to the upper tread on the upper floor, a clamping bolt engages the nut. At the footing end of the central column is welded a stand or bottom plate which rests on the lower support on the lower floor and is fixedly anchored to the lower floor by bolts or dowels. On the central column are aligned, one above the other, the individual treads, spaced from each other by spacer sleeves. By pre-stressing the central column at the head thereof with respect to the landing plate or the upper tread, the several treads with the spacer sleeves therebetween are simultaneously firmly pressed to each other.
OBJECTS OF THE INVENTION
It is disadvantageous in the known spiral staircase structures, that the central columns must be provided in exactly predetermined lengths depending on the floor spacing. However, since the floor spacings differ substantially from one case to another, the central columns are required in most varying lengths which can be produced only by way of custom-made products. The storage of central columns in all conceivable lengths is uneconomical.
Thus, it is an object of the invention to provide a spiral staircase of the aforesaid type, wherein storage of central columns having one or a few lengths is possible, and wherein the exact adjustment of a given central column to a predetermined length can be effected by simple cutting tools without welding, even at the building site, in a "do-it-yourself" fashion.
SUMMARY OF THE INVENTION
According to the invention, the object has been achieved by dividing the steel tube into two tube sections of which one section can be shortened at its one end to adjust the entire height of the spiral staircase at the construction site, to match the desired size, while the other section is ready-made and is fixedly securable to the first section at the construction site.
A further advantageous embodiment of the invention resides in that the steel tube comprises a pipe section adjacent to the landing plate or end tread, which can be shortened at its free end for adjustment to the total height of the spiral staircase at the construction site, and that a ready-made tubular sleeve is provided, which is fixedly secured to a bottom plate, which telescopically engages the free end of the shortened tube and/or telescopically surrounds the shortened tube.
A still further advantageous embodiment according to the present invention resides in that the steel tube comprises a longer tube section fixedly secured to a bottom plate, and a shorter tube section ready-made for engagement with the landing plate or an end tread, and whereby the free end of the longer tube section may be shortened at the construction site to such a length that both tube sections abut against each other with their free ends to provide the required total height for the spiral staircase, and that at the free end of the shorter tubular section there is provided a tubular sleeve which engages the free end of the longer tube section in a telescopic fashion.
It can be of advantage in all embodiments to insert between the faces of the steel tube sections abutting each other simple annular members from resilient material. Further advantageous embodiments are apparent from further dependent claims.
The base mounting of the two-part central column does not pose any problem since, due to the shortening of a central column portion only at the construction site, an exact adjustment of the required total length, differing from case to case, of the central column assembled from both portions can be done very easily. In particular, the shortening can b
REFERENCES:
patent: 2652674 (1953-09-01), Lee
Fasse W. G.
Friedman Carl D.
Gould D. F.
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