US1687600A - Stair nosing - Google Patents

Description

Oct. 16, 1928.

H. A. WELCOME STAIR NOSING Filed NOV. 20, 1924 52" INVENTOR.

P A Tram/5} other tread the top Patented 0a. 16, 1928.

naaon'n a. wnncon, or LOWELL, nssacnusms, .assrcuoaso I ASON SAFETY OOI PAH Y, OI LOWELL, A OQBPQBA'IIOH.

s'rnp riosnm.

Continuation of application aerlal lo. 897,857, fled Isl-ch 5, 19M. "l'hil I ean Serial No. 151,013. 1

This invention relates to safety treads, or.

non-slipping treads, such as are desirable.

for use on stair-ways, bus. and car steps, and

J sons s ipping, and where there is excessive wear.

I This present a plication is a ,continuation' of application ed by meMarch 5, 1924, Serial No. 697,357. v

My p11 is to provide a cheap, ;rela

tively llght tread which can bereadily. transorted, and attached without beinglmjured.

or various reasons, including o cleanness' and lightness, I wish to provide a surface of which is substantially flat, and which is made up principally of. an artificial stone composition such ascorundum', a'lundum, allox'ite. Preferably I use carborundum combined and mixed wi h '20 a cement capable of use in any ,artificial stone which will hardenquickly, and bind gritty non slipping material together.- Suchmaterial is lighter and less expensive than le'ad,'or other relatively "tough metal,

asf h'utis generally more or less brittle or friable, and therefore requires reinforcing at certain This application has reference to the application of 'artificialn'on-slipping stone to what is known in the trade sea-structural or self-supporting tread havin a substantially rigid inconnection wit the front edge 'or BOSIIIg." Where this'front edge, or nosin is made of artificial stone it is apt to brea as andwear too rapidly, and I. therefore have deyigad suitableaprotection and reinforcing which" will not'liowever cause this edge 'to be slippery, as is the case where an all steel, bronze, or other similar continuous metallic ed ing is used. I

Vhlle I ma use atread in which transverse strips 0 metal extend to or near the surface, I expressly disclaim any construction in which there are metal strips from front to back which reach the top surface of the stoneas the foot will slip on such strips. Fig. 1 is a sectional perspective of a-structural stair tread of in construction showing some of the channels led with composition, and others not so filled.

Fig. 2 is a plan view of a modified type of base plate, holding members and front teeth. Fig. 3 is a front view ofthe tread shown in 2o l laces where there is'danger of per-' ribs 90. v

application filed Iovember a0,

Fig. 4 is a plan view of another modifica tion.

Fig. 5 'is -a rspective view showinigthe construction 0 F 2 but with ribs at the front extendin in th' directions.

In Fig. 1 e structural base plate P is strong enough to be self-supportin and has channels .91- which are shown as ovetailed but may be of any other shape, between which are upwardly projecting dovetail shaped Plate Palso has at thefront a downward project on 93 and an upwardv projection havmg teeth 92, .92, ,between which are spaces;

The non-slipping compositionR fills thesechannels 91, 91 u to the top surface ofthe holding ribs 90, t us forminga substantially flat smooth to surface for the'tread, and

one which can easil cleaned.

, This composition a extends at 95 between the front and top faces of front teeth 4 92, 92 so that the nosing is also smooth. The whole tread is thereby made light, strong and easily cleaned. I y

- In Fig. 2 I show of cast iron, having transverse channels with artificial stone non-slipping, composition such as 34, between ribs 31' and 32. Toward the front or nosin edge, I show diagonal ribs 33 separated y'spaces 37 which are filled with com ition 35 as shown.

' The front or nosing edge as shown in Fig. 3 therefore presents the edges .of ribs 33 indicated by 38 which serve as protecting and reinforcing teeth, and between these s the composition 35.

In Fig. 4 I show a slight modification of what I may call a herrin ne construction in which there are short diagonal IlbS 41',- 41, extending in one direction, and in staggered relation thereto, other. ribs 44 extending a-base 30'which may be, llegl projecting integral ribs with the spaces between filled up flush with an artificial stone non-slipping composition which is lighterthan lead and the front edge or nosing has upwardly pro'ecting r'ront teeth between and flush with w 'ch the composition extends.

I claim:

5 1. In a stair tread, the combination of a rigid base plate from which a plurality of flush with thetop faces of the ribs and teeth. 2. In a stair tread, the combination of a rigid base plate from which a plurality of integral ribs extend upwardly, there being proximate the front edge, a plurality of parallel diagonally disposed ribs, the ends of which are exposed; with a non-slippin artificial stone composition which exten' s between and flush with the top faces of the ribs and teeth.

HAROLD A. WELCOME.

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