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Патент USA US3025649

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MarcHZO, 1962
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'
W_J,LEM.EUX
CONCRETE
STEPS
Filed May 20, 1959
' V ,
'
3,025,639
United States Patent ()??ce
1
3,025,639
_
CONCRETE STEPS
Wilfrid J. Lemieux, 222 5th Ave. SE“, Dauphin,
_
Manitoba, Canada
Filed May 20, 1959, Ser. No. 814,423
'
2 Claims.
(Q1. 50-108)
3,025,639
Patented Mar. 20, 1962
2
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 upstand
ing 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
The invention relates to stairs wherein the component
or more mortises 5 such being positioned rearwardly
parts are formed from concrete or other self setting,
of the stringer.
reliable material suitable for the purpose and wherein 10
If the stairs terminate at the upper end with a step,
the several parts are designed for inter?tting association
it is considered that a single mortise in each striniger is
so ‘that they can be stored or shipped in knockdown con
all that is required, whereas if it terminates in a platform
dition and quickly and accurately assembled by unskilled
persons.
or landing 6 as herein shown, two or more mortises can
be supplied depending on the depth of the platform from
A further object is to so design the several parts so 15 front to rear.
that they interlock, one with the other, when being as
sembled and also such that they can be lifted and as
sembled in position by workmen with little e?ort.
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
There is also a horizontal hole 7 sup~
plied in each stringer adjacent the mortise or mortises.
In practice, the stringers are preferably‘ set up on foot
ings 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
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
is dependent on one or more beams 8 supplied for use in
without altering the structure of the component parts
to be assembled for any particular job and further to
set up they are tentatively held in place by elongated
tie-rods 10‘ passed through the holes 7 and supplied with
supply spacing means between the stringers together with
tie-rods for clamping purposes.
‘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 string
ers.
When the stringers and beam or beams have been
nuts 10' which can be tightened up as required.
Each riser 11 is of the desired riser height and stair
Further objects are to supply the stair risers with hori 30 width and has its lower edge formed with a forwardly
zontal ledges at their under sides to support the ?anged
extending, continuous, reinforcing and spacing ledge 11’,
rear edges of the adjacent steps, to provide slots in the
the ends of which stop short of the ends of the riser to
stringers to receive the lower corners of the risers, to
provide end shoulders 11x as best shown .in FIGS. 4 and
provide the steps with front and rear ?anges, the former
7 of the drawing. In practice, the risers are put in place
of which overlie the upper edges of the risers and the
in an upright position with their lower corners seated
latter of which enter the slots in advance of the risers,
in the rear of the notches 4 and at such time the shoul
to so design the ledges that their ends in the assembled
ders UK of the ledges occupy a position butting against
stairs will abut the inner faces of the stringers and to
the inner faces of the stringers. The so positioned ledges
supply one or more spacing beams mortised into the
not only prevent end shifting of the risers but also re
stringers together with tie-rods interconnecting the string
inforce the risers.
ers and supplied with adjusting nuts.
Each step 12 is of the required step length and width
The nature and advantages of the invention will be
and has its front and rear edges supplied with marginal,
better understood when the following, detailed descrip
down turned ?anges 12' and 12K and when the steps are
tron is read in connection with the accompanying draw
put in place their rear ?anges are received in the notches
mg, the invention residing in the construction, combina
4 and rest on the ledges 11’ and their front ?anges over
tion and arrangement of parts as claimed.
lie
and retain the upper edges of the risers.
Referring now to the drawing:
In the drawing, it will be obvious that the landing or
_ FIG. 1 is a perspective view of a stairway constructed
platform 6 is simply a wide step, from front to rear, and
in accordance with my invention.
has its front ?ange 6' overlying and retaining the upper
FIG. 2 is a vertical sectional view centrally through
most riser and its rear ?ange 6x received in suitable
the stairway from front to rear.
notches supplied in the rear upper corners of the stringers
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.
and indicated at 1x.
I might mention that when the platform is of consider
able 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
FIG. 5 is a perspective view of a fragmentary portion
central part of the platform as their upper edges butt
of the stairway and showing associated parts in assembled
the underside of the platform. On the other hand if the
positions.
platform is virtually a step width, it is considered that one
FIG. 6 is a perspective view of a fragmentary portion
spacing beam will su?‘ice.
60
of one end of a beam and showing particularly the end
When all the parts, hereinbefore described, have been
tenon.
FIG. 7 is a perspective view of a fragmentary portion
of the other end of one of the risers.
assembled in inter?tting 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 struc
In the drawing like characters of reference indicate
65 ture with all parts amply reinforced to withstand the
corresponding parts in the several ?gures.
rigorous stresses to which stairs are subjected.
The stair comprises, in the main, stringers, risers, steps
The slabs forming the several component parts of the
and spacing beams which are made from pre-cast or
stairs are desirably made as light as safely possible so
moulded slabs of self setting compound such as concrete
that they can be lifted and put into place by two work
or other durable and acceptable material and all of which
men and with such in view the slabs are made relatively
are designed to inter?t when assembled to form the 70 thin and are well reinforced by metallic rods 13 imbedded
stairs.
in the self setting material from which the slabs are made.
8,025,639
What I claim as my invention is:
1. In a concrete step assembly an opposing pair of up
standing stringers, said stringers presenting a series of up
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
standing, 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 trans
verse risers having vertical portions engaging the shoul~
ders and having their lower corners seated rearwardly in
the slots, the lower edge of each vertical riser portion 10
being provided with a forwardly extending reinforcing
4
vertical portions engaging the shoulders and having their
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 ?anges resting on the ledges and received
in the slots in advance of the risers and front down
turned ?anges retaining the risers against the upstanding
ledge with the ends spaced inwardly from the ends of the
shoulders of the stringers, a landing platform seated on the
risers and the upper surface thereof being in the plane of
?at supports provided at the upper ends of the stringers
the lower corners of the riser with the ends of said ledge
abutting the inner faces of the stringers, horizontally 15 and having a down turned front ?ange overlying the
upper edge of the uppermost riser and a rear down turned
disposed, transverse steps resting on the stringer supports
?ange entered in the stringer notches, upstanding, rein
and having rear down-turned ?anges resting on the ledges
forcing beams underlying and engaging the under side
and received in the slots in advance of the risers and
provided forwardly with down turned, riser engaging and
retaining ?anges and adjustable tension bolts extending
between the stringers.
2. In a concrete step assembly, an opposing pair of
of the platform and having their ends abutting the inner
20 faces of the stringers and provided with tenons received
in mortises provided in the stringers and adjustable ten
sioning bolts extending between the stringers and adjacent
to the beams.
upstanding stringers, said stringers presenting a series of
upstanding riser engaging shoulders alternated with hori
References Cited in the ?le of this patent
zontally disposed step supports, there being open topped 25
UNITED STATES PATENTS
transverse slots provided in the stringers at the junction
1,475,777
Ballenger ____________ __ Nov. 27, 1923
of said supports and shoulders and said stringers having
1,879,996
Sherwood ____________ __ Sept. 27, 1932
their upper ends terminating in opposing ?at-lying plat
Byington _____________ .. Oct. 22, 1940
form supporting supports of a width considerably greater 30 2,218,523
than the width of the step supports and having their upper,
rear corners notched, upstanding‘ transverse risers having
2,885,883
2,939,309
Torricelli _____________ _.. May 12, 1959
Sitton ________________ __ June 7, 1960
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