US829107A - Stair. - Google Patents

Description

PATENTED AUG. 21, 1906.

S. GROSSMAN.

STAIR.

APPLICATION FILED FEB. 21. 1906.

KM l M 5 11 u 01 1 to z V I ll W o m SAMUEL GROSSMAN, or NEW YORK, N. Y.

STAIFI.

Specification of Letters Patent.

Patented Aug. 21, 1906.

Application filed February 21, 1906- Serial No. 302,262.

To all whom it may concern: 7

- Be it known that I, SAMUEL GROSSMAN, a citizen of the United States, residing in the borough of Manhattan, county and State of New York, have invented certain new and useful Improvements in Stairs, of which the following is such a full, clear, and exact description as will enable any one skilled in the art to which it apertains to make and use the same, reference eing had to the accompanying drawings, forming part of this specification.

he principal ob'ects of my invention are to provide stairs which while having greater strength than similar .structures of equal weight are fireproof, at the same time are neater in appearance and simple in construction, the various parts thereof being easily assembled and secured together in erecting the stairs in place.

The invention also seeks to utilize to the best advantages light-Wei ht sheet metal and angle-irons and to provi e a fireproof structure the weight of which may be materially reduced by the omission of the usual sheetmetal tread beneath the stone tread.

With these and other objects in view my invention consists in the various novel and peculiar arrangements and combinations ofthe several parts of the structure, all as here inafter fully described and then pointed out in the claims.

I have illustrated a type of my invention the accompanying drawings, wherein- Figure l is a perspective view of my improved construction in stairs, the u per ste 3 thereof being shown as complete inclu ing the treads, while the lower steps are only partially constructed. tical the riser omitted. Fig. 3 shows a metallic blank with a notch in its edge from which the continuous angle-iron is formed for supporting the risers. Fig. 4 is a sectional view taken on a vertical plane lengthwise the stairs with the stringer omitted and showin the relative ositions of the angle-iron, tread and riser. ig. 5 is a cross-sectional view of another form of riser in which the flanges thereof are bent in opposite directions.

Referring to the drawings, in which like numbers 0 reference desi nate like parts throughout, 1 indicates a side wall against which the stairs are constructed and in which is set, flush with the face of the wall, the innor stringer 2, which is made of thin sheet New York city,

Fig. 2 is a ver-- cross-sectional view of one step with metal and has its up er and lower edges formed with an integra flan e 3, projectin inwardly, so as to be embed ed in the wal The outer stringer 4is constructed like the inner one, with the inte ral flan es 5 at the,

upper and lower edges t ereof, w ich flanges project inwardly, the stringers being formed near each flange with strengthening and ornamental corrugations or bends 6, extending longitudinally of the strin er. The edges of this stringer are thus ma e hollow, at the same time appear solid from the.outside thereof. T liis integral molding 6 on the face of the outer stringer may be varied in shape or design to suit the taste. These stringers, as stated, are made in one piece with theflan es, and the formation of these longitudinal flanges or corrugations 6 on the stringers serve to materially strengthen the same and ermits of a substantial reduction in the thickness of the metal used. For example, by making the sheet-metal stringers as herein set forth I am enabled to use sheetiron of one-sixteenth of an inch thick, and thereby materially lighten the weight of the structure, the corresponding stringers heretof ore made of sheet metalrangingfrom threesixteenths to one-quarter of an inch in thicknose.

The side or end supports for the risers are formed from angle irons 7, which are notched at 8 and cut at 9, so that they may be bent into a zigzag structure with right-angle bends, forming a continuous piece extending the length of the stairs. These angle-irons are formed so that one of the flanges thereof lies flatly against the inner face of its adjacent stringer, one angle-iron being secured to each stringer. The other flange of each angleiron hes uppermost and outermost when looking toward the front of the stairs, as shown clearly in Fig. 1. As these supporting angle-irons can be bent exact alike, they may easily be put in place, one against each 0 the stringers, to which they are secured by means of suitable rivets 10 extendin through the vertical flange and into the flody of the adjacent stringer, so as to give ample stren th thereto, at the same time dispensin with bolt-heads showing upon the outsh e of the stringer.

The risers 11 are made of sheet-metal and are each formed with a lateral flange 12 at its up er and lower ed 7 e extending throughout t e length thereo which flan es may either both project forwardly, as s can in Fig. 1-, or the lower one may extend forin proper position thereon, and the rises and wardly while the upper one pro'ects reartreads may be taken separately to the buildwardly, as shown in Fig. 5, w erein the ing or place where it is desired to erect the flanges 12 are shown as pro ecting in o postairs, and these simple parts may be assem- 5 site directions. The risers 11, being ma e of bled and placed into correct position without 70 sheet metal and provided with the integral requirin any special work to be done at such flanges 12 on the long edges thereof, are therepllace. y improved construction in stairs by given increased strength, so that the risers as the advantage of iving a better appearmay be made of thinner iron than has been ance to stairs whic are constructed of heretofore used in the construction of similar metal, and, moreover, it possesses the im- 75 stairs, and thus I provide stairs which are ortant advantageof havinggreater strength materially lightene in weight in the risers or a given weight than other structures, and

themselves, and I am enabled to use iron they may be made com letely fireproof. As one-sixteenth of an inch thick in this part of there are no bolt-headss owingupon the out- 15 the structure. Further strength is given to side of the strin ers and the steps themselves 80 the sheet-metal risers by forming each with present a very nished and neat appearance, ,corrugations or paneling, as at 13, which also the structure may be painted to resemble serves to ornament the riser in addition to hard wood with excellent effect. giving it increased strength. It willbe noted Having thus described my invention, what that these panels 13, formed in the body of I claim, and desire to secure by Letters Pat- 85 the sheet-metal risers, may be made of any ent, is shape or design that may be desired so that 1. Stairs comprising the combination of the ornamental feature of such anel may be suitable stringers, supports located upon the varied. At the same time t ie increased inner side of said stringers, treads, and indez 5 strength of such panel is alwa s resent. pendent sheet-metal risers secured to said go The users are bolted, by means o be ts 14 at sup orts and provided with integral flanges each end, to the vertical flange of the angleat t e upper and lower ed es thereof for eniron 7, and the lower flange receives the rear gagin said treads resting t hereupon. edge of the tread 15, while the upper flange of 2. tairs comprisin the combination of c the riser receives the forward edge of the sheet-metal strin ers aving longitudinally 5 tread 15 next above, and thus the risers su extending strengt ening ribs or corrugations port the treads by means of the flanges. 11 formed therein, supports located upon the inthis connection it is observed that in using ner side of said stringers, treads, and indestone treads, such as slate or marble, I can pendent sheet-metal risers secured to said 3 5 dispense with the ordinary sheet-metal sup orts and provided with integral flanges loo tread underneath the stone one in some cases, at the upper and lower edges thereof for enthough where fireproof stairs are desired a gagin said treads. sheet tread may be placed under the stone 3. tairs comprisin the combination of one, it being so arranged as to rest upon the sheet-metal strin ers aving longitudinally- 4o riser-flanges. In cases where each riser has extendin strengtiiening ribs or corrugations 105 its upper and lower flange projecting in opformed t erein, suitably-bent angle-irons for osite directions, as shown in Fig. 5, such supporting the treads and risers at each end I anges would both extend over upon the thereof and secured by one flange to the inner horizontal part of the angle-irons, so that the side of the adjacent stringer, treads resting 5 tread would rest at its ont edge upon the on the said angle-iron supports," and risers no rearwardly-extending flan e of one user and secured at their ends to said angle-iron supat its rear ed fe upon the orwardly-extendports, respectively. ing flange of t e next riser above, and in such 4. Stairs comprisin the combination of case a suitable filling-piece may be inserted sheet-metal strin. ers aving longitudinallybetween the opposing edges of the flanges extending strengt ening ribs or corrugations 115 and beneath the tread to relieve the latter of formed therein, supports located upon the inan% undue stress. ner side of said stringers, treads, and sheethe treads 15 are each rabbeted at 16, at metal risers secured to said supports and prothe back edge thereof, to fit over the lower vided with integral flanges at the upper and flange 12 of the riser at the rear of the tread. lower edges thereof for enga ing said treads, 1 20 In the modification, however, shown in Fig. the said risers being forme with strength- 5, where the u per flange of the riser is ening-ribs or paneling thereon. turned backwar ly, the flange may be placed 5. Stairs comprisin the combination of over upon the horizontal art of the anglesheet-metal strin ers aving longitudinallyiron and be on a level wit the lower flange extending strengt ening ribs or corrugations 12: of the riser next above, and these two flanges formed therein, treads, supports located upon will be in the same horizontal plane, so that the inner side of said stringers and receiving the tread may rest directly upon them withthe respective ends of said treads, and inde out cutting away any art thereof. pendent sheet-metal risers secured tov said The Stringers,witht c angle-ironsfastened supports and provided with integral flanges r at the upper and lower edges thereof for ensaid treads. V

6. teirs comprising the combination of suitable stringers, supports located upon the 4 5 inner sides of said stringers independent sheet-metal risers secured at their respective ends to said supports on the stringers, said risers being provided at their lower edges with flanges, and trends each resting upon the upper edge of one riser end the flange at 10 the lower edge of the riser next above.

In testimony whereof I have hereunto set my hand in the presence of the two subscrib-

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