US1166428A - Pressed-steel stair. - Google Patents

Description

G. W. BROOKS.

PRESSED STE-EL STAIR.

APPLICATION FILED IAN.12, I915- Patented Jan. 4, 1916-.

I fimromiw;

GH mug GEORGE W. BROOKS, OF TOPEKA, KANSAS.

PRESSED-STEEL STAIR.

Application filed January 12, 1915. Serial No. 1,742.

To'aZZ whom it may concern:

Be it known that I, GEORGE W. Baooxs, a. citizen of the United States, residing at Topeka, in the county of Shawnee and State of Kansas, have invented certain new and useful Improvements in -Pressed- Steel Stairs, of which the following is a specification.

This invention relates to certain new and useful improvements in metallic stairs and it has for its objects among others to provide a simple, improved solid pressed steel tread and riser with means of interlocking.

the one riser with the tread of the next stair so as to form a complete stair" It has for a further object toprovide a simple form of looking or fastening means which will be concealed from the front of the stair and to provide for adjustment at the front of the tread to allow for various heights or irregularities in the formation of the treads, or to allow of an adjustment to correct the errors in the different heights of the floor landing.

It has for a further object to provide a structure of this character embodying economy of manufacture, great tensile strength, saving of time in assembling, and which will be neater and more pleasing in appearance than the prior forms especially those of cast iron.

By forming thestair by dies I am enabled to employ lighter materialflmore accurate fit without liability of cracking or breaking. Furthermore, the steel isthus reinforced and is stronger than cast iron. Furthermore, no ragged edges are left, hence all abutting joints are tightly fitted, making the construction strong and rigid. Being accurately pressed into shape, it is sanitary both as regards rounded or convex cornersand the nosing. The form. of nosing c nforms to the shape .of standard style of wood treads and has the additional sanitary feature of the ends and portion around the safety grips being left smooth so that dirt which accumulates on the tread can be brushed olf over the smooth place, thereby making it easy to keep clean. By having the rounded poncave corner at theback of the tread which prevents the accumulation of dirt, I provide a sanitary feature formed from the tread itself, no crevices or corners being provided for the dirt to lodge in.

Other objects and advantages of the invention Will hereinafter appear and the pointed out in the appended claims. The invention. is clearly illustrated'in the accompanying drawings, which, with the numerals of reference marked thereon, form a part of this specification, and in which- Figure is a perspective view showing I one of my lmpi oved pressed steel risers and treads, the latter being shown as interlocked with the adjacent edge of the next riser. Fig. 2 is a vertical sectional detail through the front end of the tread. Fig. 3 is a detail in vertical section showing a modified construction. for the interlocking of the tread and riser. Fig. 4 is a similarview of a modified form of construction. Fig. 5 is a section similarto Fig. 2 showing a square noslng.

Like numerals-of reference indicate like parts throughout the several views.

Referring to thedrawings, '1 designates my improved pressed steel tread and riser, the same embodying in one integral element the tread portion 2 and the riser 3, the same being formed at a curve, asshown'at 4, at the point of junction of the riser and tread, the upper end of the riser being formedwith a substantially horizontal extension 5 terminating in the downwardlytandrear- Wardly extended lip or extension 6, as shownclearly in Fig. 1. The forward end of the tread portion 2 is formed into a half round nosing 7 from the inner face of which depends the substantially vertical wall 8 which is extended rearwardly substantially horizontally, as at 9, and terminates in the upwardly extended lip 10. This upwardly extended lip may be substantially vertical and parallel to the outer wall 8, as seen in Figs. 1 and 2, or it may extend forwardly from its junction with the rear face of the portion 9 at an angle of about 1 as seen at 11 in Figs. 3 and 4. Furthermore, the lip 6 of the upper end of the riser may extend vertically, as seen at 12 Specification of Letters Patent. Patented Jan, 43:, 1916.

novel features thereof will be particularly stronger than cast iron,.with much greater tensile strength and without possibility of cracking or breaking.

The method of assembling the parts will be readily understood. As seen in Figs. 1, 3 and t, the depending lip of the upper end of the riser is received .within the channel of the inwardly extended terminal of the nosing, the riser being placed into position and thus retained by the interlocking of the interengaged portions of the riser and the adj oimng tread. The riser is readily adj ustable to suit the required height in case error is made in fastening the angles or locating punched holes for holding bolts for supporting the treads. It is to be noted that the bottom of the riser and the top of the tread are concave at the starting point of .the tread and also of the riser and that the half round nosing at the front of the tread with a right angle bend supporting the same, with the supporting member returning to the riser and this supporting member being bent at right angles, thus forming a pro-' jecting nosing or sunken panel riser. The lock is invisible from the. front of the tread, providing a neat finished appearance.

It will be noted that in all the-forms shown,the terminal of either the riser or the tread extends in an inclined direction and has a bearing against one of the adjacent members of the other part. In the form shown in Fig. 3 the inclined portion '13 bears 'directly upon the inclined terminal v11 of the tread. The inclined lip forms a brace and adds strength to the joints. Fur thermore, by inclosing the depending wall of,

i the extension of the riser, or the terminal wall of the trough-shaped portion of the tread, I form an interlock that aids materially inholding the adjacent treads and risers against tendency to get out of proper assembled position.

In some cases I have found it desirable to form the tread with foot grips, as shown.

at 14, which may or may not extend for a andextending as they do above the face of the tread proper, give an additional wearing surface of the same depth before the aaeegeae 4 7 foot grips or tread will be worn level to the body of the tread proper.

It is evident that l'may employ a rectangular-or square nosing inlieu of the rounded nosing previously described. Such is shown in Fig. 5 in which 2' is the tread portion, 7 the square nosing, 8 the vertical outer wall, 9' the horizontal extension and 10' the upwardly extended lip. 14: represents the foot grips.

Modifications detail may be resorted to without departing from the spirit of theinvention or sacrificing any of its advantages.

What is'claimed as new is i 1. A pressed steel tread and riser complete in a single integral element, the tread being formed with a curved nose and a rearward trough-shaped extension beneath said nose and the riser terminating in a forward extension with rearwardly angularly extended lip. Y

2. A pressed steel tread and riser complete in a single integral element, the tread being formed with a curved nose and a riser terminating in an angularly extended lip, and the tread having a trough-shaped portion extended rearwardly from the nose at a distance from the surface of the tread for cooperation with the lip oflsan adjoining riser.

3. A pressed steel tread and riser in a single integral element, the riser having at its upper end a horizontal extension and an inclined terminal forming'a lip and the .tread having a rounded nose terminating in a trough shaped portion with one wall of which the inclined lip of an adjacent riser .is designed to cooperate.

4'. A pressed steel tread and riser in a single integral element, the riser having at its upper end a horizontal extension and a downwardly extended terminal, and the tread having a rounded-nose terminating in a trough-shaped portion in which the depending portion of an adjacent riser is received and with which it is designed to cooperate, one of the cooperating portions being inclined.

In testimony whereof l aiiix my signature in presence of two witnesses.

GEORGE W. BRUOKS.

Witnesses: 4

J Moore, G. L. Brena.

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