US760752A - Plastic stair. - Google Patents

Description

I No. 760,752. PATENTBD MAY24,1904. P. R! PETERSON.

PLASTIC STAIR.

APPLICATION TILED EAR. 21, 1904. v

2 SH BETS- -SHEET 1.

N0 MODEL.

I p g v a, c v

Ifatented May 24, 1904. I

, I PATENT @m a FREDERICKeR. PETERSON, on MALDEN, MASSACHUSETTS.

PL ASTI C sTAm.

SPECIFICATION forming part of Letters Batent no. veer/52, dated May 24, 1904.

' application filed March 21, 1904.-

To a) whom it may concern:

Be it known that I, FREDERICK R. PETER- soN, a-citizen ofSweden, and a resident of.

' Malden, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Plastic Stairs, of which the following is a specification.

This invention relates to improvements in plastic or concrete stairways and a metal skeleton supporting-frame, as will hereinafter be more fully shown and described, reference being had to the accompanying drawings, where Figure I is a top plan View of the invem tion, showing the cement removed from oneof the steps. Fig. 2 is a partial cross-section on the line 2 2 shown in Fig. 1. Fig. 3 is a partial cross-section on the line 3 Sshown in Fig. I. Fig. 4 is a side elevation as seen from the openor independent side of the stairs.

Fig. 5 is a section on the line 5 5 shown in Fig. 1, and Fig. 6 is a side view of the metal supporting-frame as seen from w in Fig. 1.

Similar letters refer to similar parts wherever they occur-on the different parts of the drawings. V

The invention is applicable to what is termed an open or independent fireproof stairway, in which both sides of the stairway are free and exposed, as well as to similar stairways in which one or both sides are located adjacent to walls in the building, as may be desired, according to the construction or arrangement of the interior walls of the building.

In the drawings,A and B are the respective upper and lower preferably metal I floor beams to which the upper and lower ends of the framework of the stairway are suitably supported in any well-known manner. The metal framework consists of inclined metal stair-supports C 'D, preferablymade of angleiron, and intermediate such angle-iron supports is located a central support E, preferably made of T-iron, as shown. Only one such T- iron support is shown; but moremay be used,

according to the width of the stairway.

To the angle-iron D''that is, the exposed side of the stairwayis secured a metal plate or stringer F, which serves tovprotect the Serial No. 199,113. -'.No model.)

cement filling G from being defaced or disintegrated, and in Stairways that are exposed on both sides such metal stringer is used on both sides of the stairway.

For protecting the edges of the cement steps G, I make use of metal angle-moldings H,

which are secured to the center supportingbeam E by means of metal diverging stays or braces I I, riveted to said beam E and anglemoldings, as shown.- On the exposed side of the stairway I make on said angle-molding H exposed end of cement'step, as shown. For

the purpose of securing and firmlyholding the cement step in position relative to the skeleton an angular end extension H for protecting the I framework I secure to the angle-molding ex' tensions H suitable metal angular anchorstrips It h, resting on the upper edge of the metal stringer F or riveted thereon, which anchors are embedded in the plastic cement when filled in between the skeleton framework of the stairway.

Gn the unexposed side of the stairway namely, the one adjacent to the wall K in Figs.

land 5 the stringer F maybe dispensed with, as well as the angle-molding extension H, in lieu of which I secure to the end of the anglemolding H and side bar C a horizontal metal strap L, which is, attached to the latter and the angle-bar C by means of a vertical metal strap Z or hanger, preferably riveted to said parts, as shown, and forming a supportingbracket interposed between the angle-molding and bar 0.

After the parts composing the skeleton metal framework have been assembled the interstices are filled with plastic cement or concrete, which is allowed to set and harden, causing the metal framework'to be'embedded in the cement, by which a fireproof stairway is produced of great strength and durability.

- Having thus fully described the nature, construction, and operation of my invention, I wish to secure by Letters Patentand claim- 1. A skeleton frame for cement-lined stair- Ways consisting of parallel metal side supports, one or more intermediateT-beams, an anglemold or edge-protector, diverging braces connecting the latter, and the T-beam and a metal stringer secured to the exposed side of the stairway substantially as and for the purpose set forth.

2. A skeleton frame for cement-lined stairways consisting of parallel metalside supports, one or more intermediate T-beams, an anglemold or ed ge-protector, diverging braces connecting the latter and the T-beam, a metal stringer secured to the exposed side of the stairway, and metal anchor-plates secured to the angle-mold and adapted to be embedded in the cement or plastic material as set forth.

3. A skeleton frame for cement-lined stair ways consisting of parallel metal side supports,

one or more intermediate T-beams, an anglemold or edge-protector, diverging braces connecting the latter and the T-beam and a supporting-bracket connected to the angle-mold and side support at the unexposed side of the stairway as set forth.

In testimony whereof I have afiixed my signature in presence of two witnesses.

FREDERICK R. PETERSON.

Witnesses:

ALBAN ANDREN, ALVAH C. STONE.

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