US3025639A

US3025639A - Concrete steps

Info

Publication number: US3025639A
Application number: US814423A
Authority: US
Inventors: Wilfrid J Lemieux
Original assignee: Individual
Current assignee: Individual
Priority date: 1959-05-20
Filing date: 1959-05-20
Publication date: 1962-03-20
Anticipated expiration: 1979-03-20

Description

MarcHZO, 1962 ,LEM.EUX V 3,025,639

CONCRETE STEPS Filed May 20, 1959 United States Patent ()flflce 3,025,639 Patented Mar. 20, 1962 3,025,639 CONCRETE STEPS Wilfrid J. Lemieux, 222 th Ave. SE, Dauphin,

Manitoba, Canada Filed May 20, 1959, Ser. No. 814,423

' 2 Claims. (Q1. 50-108) The invention relates to stairs wherein the component parts are formed from concrete or other self setting, reliable material suitable for the purpose and wherein the several parts are designed for interfitting association so that they can be stored or shipped in knockdown condition and quickly and accurately assembled by unskilled persons.

A further object is to so design the several parts so that they interlock, one with the other, when being assembled and also such that they can be lifted and assembled in position by workmen with little eflort.

A further object is to design the several parts so that they interlock with one another when being assembled and subsequently can be tied into a very rigid structure by employing tie-rods supplied for the purpose.

A further object is to design the structure so that the flight of steps can be increased or diminished depending on the distance to be traversed by the stairs and such without altering the structure of the component parts to be assembled for any particular job and further to supply spacing means between the stringers together with tie-rods for clamping purposes.

Further objects are to supply the stair risers with horizontal ledges at their under sides to support the flanged rear edges of the adjacent steps, to provide slots in the stringers to receive the lower corners of the risers, to provide the steps with front and rear flanges, the former of which overlie the upper edges of the risers and the latter of which enter the slots in advance of the risers, to so design the ledges that their ends in the assembled stairs will abut the inner faces of the stringers and to supply one or more spacing beams mortised into the stringers together with tie-rods interconnecting the stringers and supplied with adjusting nuts.

The nature and advantages of the invention will be better understood when the following, detailed descriptron is read in connection with the accompanying drawmg, the invention residing in the construction, combination and arrangement of parts as claimed.

Referring now to the drawing:

FIG. 1 is a perspective view of a stairway constructed in accordance with my invention.

FIG. 2 is a vertical sectional view centrally through the stairway from front to rear.

FIG. 3 is a perspective view of one of the stringers and showing also and in perspective view, a portion of a beam and of a tie-rod.

FIG. 4 is a perspective view of a fragmentary portion of one of the risers.

FIG. 5 is a perspective view of a fragmentary portion of the stairway and showing associated parts in assembled positions.

FIG. 6 is a perspective view of a fragmentary portion of one end of a beam and showing particularly the end tenon.

FIG. 7 is a perspective view of a fragmentary portion of the other end of one of the risers.

In the drawing like characters of reference indicate corresponding parts in the several figures.

The stair comprises, in the main, stringers, risers, steps and spacing beams which are made from pre-cast or moulded slabs of self setting compound such as concrete or other durable and acceptable material and all of which are designed to interfit when assembled to form the stairs.

The stringers 1 are identical in form and if attention be directed to FIG. 3 particularly, it will be seen that each stringers is stepped, as is usual, to provide upstanding riser engaging shoulders 2 and alternating, horizontal, step supports 3 and that such shoulders and supports are separated by notches or seats 4 utilized for a purpose later apparent. Each stringer is also supplied with one or more mortises 5 such being positioned rearwardly of the stringer.

If the stairs terminate at the upper end with a step, it is considered that a single mortise in each striniger is all that is required, whereas if it terminates in a platform or landing 6 as herein shown, two or more mortises can be supplied depending on the depth of the platform from front to rear. There is also a horizontal hole 7 supplied in each stringer adjacent the mortise or mortises.

In practice, the stringers are preferably set up on footings supplied, as in common practice, and are spaced apart consistent with the length of the steps and risers supplied for any particular job in hand and the spacing is dependent on one or more beams 8 supplied for use in that particular job. Each beam terminates in vertically disposed ends supplied with a horizontal tenon 9, the tenons being adapted to enter the mortises in the stringers. When the stringers and beam or beams have been set up they are tentatively held in place by elongated tie-rods 10 passed through the holes 7 and supplied with nuts 10' which can be tightened up as required.

Each riser 11 is of the desired riser height and stair width and has its lower edge formed with a forwardly extending, continuous, reinforcing and spacing ledge 11, the ends of which stop short of the ends of the riser to provide end shoulders 11 as best shown .in FIGS. 4 and 7 of the drawing. In practice, the risers are put in place in an upright position with their lower corners seated in the rear of the notches 4 and at such time the shoulders U of the ledges occupy a position butting against the inner faces of the stringers. The so positioned ledges not only prevent end shifting of the risers but also reinforce the risers.

Each step 12 is of the required step length and width and has its front and rear edges supplied with marginal, down turned flanges 12' and 12 and when the steps are put in place their rear flanges are received in the notches 4 and rest on the ledges 11 and their front flanges overlie and retain the upper edges of the risers.

In the drawing, it will be obvious that the landing or platform 6 is simply a wide step, from front to rear, and has its front flange 6' overlying and retaining the uppermost riser and its rear flange 6 received in suitable notches supplied in the rear upper corners of the stringers and indicated at 1 I might mention that when the platform is of considerable depth from front to rear and as herein shown, it is desirable to use two or more beams 8 as they will serve not only to space the stringers, but also to reinforce the central part of the platform as their upper edges butt the underside of the platform. On the other hand if the platform is virtually a step width, it is considered that one spacing beam will sufiice.

When all the parts, hereinbefore described, have been assembled in interfitting and interlocking positions, it will be quite obvious that when the nuts of the bolts have been tightened up, the structure will become a very rigid structure with all parts amply reinforced to withstand the rigorous stresses to which stairs are subjected.

The slabs forming the several component parts of the stairs are desirably made as light as safely possible so that they can be lifted and put into place by two workmen and with such in view the slabs are made relatively thin and are well reinforced by metallic rods 13 imbedded in the self setting material from which the slabs are made.

What I claim as my invention is:

1. In a concrete step assembly an opposing pair of upstanding stringers, said stringers presenting a series of upstanding, opposing riser engaging shoulders alternated with horizontally disposed step supports, there being open topped transverse slots provided in the stringers at the junction of said supports and shoulders, upstanding transverse risers having vertical portions engaging the shoulders and having their lower corners seated rearwardly in the slots, the lower edge of each vertical riser portion being provided with a forwardly extending reinforcing ledge with the ends spaced inwardly from the ends of the risers and the upper surface thereof being in the plane of the lower corners of the riser with the ends of said ledge abutting the inner faces of the stringers, horizontally disposed, transverse steps resting on the stringer supports and having rear down-turned flanges resting on the ledges and received in the slots in advance of the risers and provided forwardly with down turned, riser engaging and retaining flanges and adjustable tension bolts extending between the stringers.

2. In a concrete step assembly, an opposing pair of upstanding stringers, said stringers presenting a series of upstanding riser engaging shoulders alternated with horizontally disposed step supports, there being open topped transverse slots provided in the stringers at the junction of said supports and shoulders and said stringers having their upper ends terminating in opposing flat-lying platform supporting supports of a width considerably greater than the width of the step supports and having their upper, rear corners notched, upstanding transverse risers having vertical portions engaging the shoulders and having their lower corners seated rearwardly in the slots, the lower edge of each vertical riser portion being provided with a forwardly extending reinforcing ledge with the ends spaced inwardly from the ends of the riser and the upper surface thereof being in the plane of the lower corners of the riser with the ends of said ledge abutting the inner faces of the stringers, horizontally disposed, transverse steps resting on the stringer supports and having rear down-turned flanges resting on the ledges and received in the slots in advance of the risers and front down turned flanges retaining the risers against the upstanding shoulders of the stringers, a landing platform seated on the flat supports provided at the upper ends of the stringers and having a down turned front flange overlying the upper edge of the uppermost riser and a rear down turned flange entered in the stringer notches, upstanding, reinforcing beams underlying and engaging the under side of the platform and having their ends abutting the inner faces of the stringers and provided with tenons received in mortises provided in the stringers and adjustable tensioning bolts extending between the stringers and adjacent to the beams.

References Cited in the file of this patent UNITED STATES PATENTS 1,475,777 Ballenger Nov. 27, 1923 1,879,996 Sherwood Sept. 27, 1932 2,218,523 Byington Oct. 22, 1940 2,885,883 Torricelli May 12, 1959 2,939,309 Sitton June 7, 1960