US1291905A - Stairway. - Google Patents

Description

C. ITSCHNER.

STAIRWAY.

APPLICATION FILED FEB. a, 1918.

1. ,29 1,905 Patented Jan. 21, 1919.

7 22772665 I 0/7077ea/zi5r/277er UNITED STATES PATENT OFFICE.

CHARLES ITSCHNER, or CHICAGO, ILLINOIS, ASSIGNOR or ONE-HALF T0 FRANKLIN r. SMITH, or CHICAGO, ILLINOIS.

,STAIRWAY.

Specification of Letters Patent.

Original application filed May 10, 1917, Serial No. 167,639. Divided and this application filed February 8,

To all whom it may concern Be it known that I, CHARLES ITsCHNER, a citizen of the United States, and a resident of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Stairways, of which the following is declared to be a full, clear, and exact description.

This invention relates to Stairways of that type shown and described in my prior application for patent on stairways, filed May 10, 1917, Serial No. 167,639, and the subjectmatter of this application has been divided out of said prior application.

The object of the present invention is to provide a stairway of simple, substantial and fireproof construction; another object is to provide a stairway of which the risers and sofiit portions are made up in units, or sections, each comprising a riser and soflit section ready for assembly in the building where the stairway is to be erected. With these and other objects and advantages in view, the invention consists in the several novel features hereinafter set forth and claimed.

The invention is clearly illustrated in the accompanying drawing, in which:-Figure 1 is a vertical longitudinal section through a fragment of a stairway embodying a simple form of the present invention, and Fig. 2 is a vertical cross section taken on the line 22 of Fig. 1, the concrete filler being omitted in this view.

Referring to said drawing, the stringers of the stairway are illustrated at 13, and are preferably constructed of sheet metal having their upper edges bent outward to provide flanges 15, and having their lower edges bent inward to provide flanges 25. tering strip 25 may be secured to one or both of the stringers 13, as is desired, and said plastering strip may be secured thereto as, for instance, by rivets 25 The stringers 13, are supported in place in the building in accordance with the usual practice as is well known to those skilled in the art to which this invention pertains.

Each step or unit comprises a soflit portion or section 11, and a riser 18, the soflit section having an upwardly bent, vertical end portion 18*, which is spot-welded to the lower end portion of the riser, as at 18 Each A plas- Serial No. 215,952.

riser has the usual nosing 18, at its upper end, formed with the usual return bend 18 which is flush with the tread of the step. The lower end of each riser is bent outward, as at 21 to provide a cove between the riser and tread of the step. The riser and adjacent soflit portion of each step are connected by a bar or brace rod 23, riveted, or otherwise secured to the riser and soflit, and merely serves to hold the upper end of the riser in a braced condition until the concrete is filled in. The risers are secured to the stringers by angle iron brackets 24, which are bolted or riveted to the risers and stringers. The soffit plates or sections 11, rest upon the inturned flanges 25, of the stringers and may be riveted thereto. Each unit is connected to the adjacent ones by over-lapping the sofiit sections and riveting or bolting them together at the places where they over-lap.

The tread of the stairway is formed by filling in, with concrete 22, the spaces between the soffit sections and upper edges of the opposing bent ends 18 and 21 of the nosing of one riser and cove portion of the next adjacent riser thereabove and the upper surface of said filler of concrete is leveled off, as shown in the drawing, to provide the tread.

As before stated, the upper end of each soilit section and a riser are secured together at the plant where the parts are manufactured, and thus form units which may be delivered to the place where the stairway is to be erected. After the stringers have been secured in place, the units comprising a soffit section and riser are secured to the stringers by fastening the angle iron brackets thereto .with bolts and nuts 24*, and also, by the bolts or rivets 25", which pass through the soffit section and inturned flanges of the stringers. The brace rods 23, are then secured in place and the overlapping soflit sections riveted or bolted together after which the concrete 22, is filled in the spaces above the soflit plates and the upper edges of the nosing and coves of the risers.

More or less variation of the exact details of construction is possible without departing from the spirit of this invention; I desire, therefore, not to limit myself to the exact form of the construction shown and described, but intend in the following claims to point out all of the invention disclosed herein. I

I' claim as new, and desire to secure by Letters Patent:

1. In a stairway, a plurality of fiat, overlapping sheet metal soflit sections secured together, said sections having upwardly bent portions at their upper ends terminating above the tread portions of the stairway, risers, one secured to each upwardly bent portion of each sofiit section above the tread portion, said risers having outwardly bent lower edges to form coves at the tread portions, and a pair of Supporting stringers to which said risers are secured.

2. In a stairway, a plurality of flat, overlapping sheet metal soflit sections secured together, each soflit section having an upwardly bent end portion at its upper end, terminating above the tread portion of the stainway, risers, one for each soffit section, and having at its lower end an outwardly bent cove portion, and at its upper end, a nosing tern'iinating in a return bend, each riser being permanently secured, above the tread portions, to the soifit section associated with it to form a unit, a pair of stringers, and brackets secured to the risers and adapt ed to be secured to the stringers.

3. In a stairway, a plurality of flat, overlapping sheet metal soffit sections secured together, said sections having upwardly bent portions at their upper ends terminating abovethe tread portions of the stairway, risers, one permanently secured to the upper end of each soflitsection above the tread portion, each riser being formed with an out- .wardly bent cove portion at its lower end, and with a nosing at its upper end terminating in a rearwardly curved portion flush with the tread of the step and in alinement with the cove portion of an adjacent riser, a pair of stringers, means for securing the risers to the stringers, and a filler in the spaces between the sofiit sections and top of one riser and cove portion of the next adj acent one.

4. In a stairway, a plurality of flat, overlapping sheet metal sofiit sections having up wardly bent end portions at their upper ends terminating above the tread portions, a plurality of risers, one for each soflit sec tion and permanently secured to the upwardly bent end thereof above the tread por tions, each riser having an outwardly curved cove portion at its lower end and a nosing at its upper end terminating in a rearwardly projecting edge portion flush with the tread of the step, and a pair of stringers, each having an outwardly bent flange portion along its upper edge and an inwardly bent flange portion along its lower edge underlying the soliit section, and brackets secured to the risers and adapted to be secured to said stringers.

CHAS. rrsoHNEn' Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents,

Washington, 20.0.

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