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Патент USA US2406497

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Patented Aug. 27, 1946 »
MichaelfHurley, Denver, Colo.
ApplicationDecembcr 29, 19,44'„,S'erial’No. 57 0,268:
(Cl. 189‘-43)
purposes of the invention that said stringers be
This: invention' relates to ' a; stair construction'
adapted> for 0preiîabri'cation in the form of' units
susceptible of convenient interengaging` assembly
designed tov carry theA loads contemplated to bev
imposed on the flight which theyA support and
to meet thestair‘requirements' of a: given installa
tion, andhasr as ansobject to> provide an improved
such construction.
A further object of the invention isto provide
an >improved interengageable‘relation of stringer
and step units constituting at stair assembly.
that the stringer construction provide a continu
ously-uniform interior chamber opening through
at least one end of each Stringer and lengthwise
thereof through a» straight, relatively-narrow,
longitudinal slot intersecting a Stringer wall and
opening through the Stringer open end.y As typi
A further Vobject ofthe-*invention is'to provide 10 cally shown in Figures l, 2, and 3, the stringers
an improved construction of cooperating Stringer
of the» invention may, for many installations, take
the «form »of straight, tubular members I0, of suit
andl step units adapted; for prefabrication in
quantity and subsequent assembly at the site to
able size, length, and strength, formed with
straight, longitudinal slots II throughout their
meet varying stair- requirements of speciñ'c in
lengths, and susceptible of fixed disposition, in
A further> object ofthe inventiony is'to provide
any appropriate manner, to bridge the span of
an improved> construction ofî stair stringer ar
the» stair flight at the desired inclination; Figure
4 illustrating an alternative or modified form of
ranged‘ to- successively receive, engage with, and
Stringer> Iûí’, of boX-girder or analogous type sus
su-pport corresponding ends of a plurality of step
units constitutingy a stair flight.
20 ceptible of fabrication as a single rolled section
or asf-an» assembly of standard structural shapes,
A further-object" of the invention is to pro-vide
incorporating and characterized by the longi
an improvedv stair step unit construction- succes
sively engageable in supported relation with a pair
tudinal slot II.
Step units of the improvement, as represented
of stringers to constitute a stair flight:
With the foregoing and other objects in view, 25 bythe drawing, are designated by the numeral
lîi andeach of said units includes rigidly and
my invention consists- in the construction, ar
perpendicularly interrelated tread and riser ,por
rangement, and combination of elements herein
tions i3 and i4, respectively, ñxedly engaging atV
after set forth, pointed out in my claims, and
illustrated by the accompanying drawing, in
their ends withy and in perpendicular relation to
30 end webs I5`si-milarly projecting in spaced, par
Figure 1- isv a somewhaty diagrammaticl cross’sec
allelism-from the unit ends. The step units I2
tion taken longitudinallyy through an incomplete
may be formed and constructed in any convenient
stair flight embodying' the principles of the in
and suitable manner from any appropriatefmate
rial; the length of the unit tread and riser por
vention.. Figure 2 isa fragmentary, detail sec-_
tion through a stair ñightconstruction similar to
tions being determined at the timel of unit manu
facture to provide the desired width of completed
Figure 1 and illustratinga modiñcatìon ofthe
showing ofthe latter figure. Figure 3> isV a cross
stair', andV` the width of tread I3 and height ofy
riser 'It being also proportioned in manufacture
section, on an enlarged scale, taken~ on the indi
cated line 3--3 of: Figure 1. Figure 4 is a view
to develop the desired angle or slope in the com
similar to Figure 3, on the same scale as Figurer-1',
pletedf flight. The webs I5 preferably correspond
illustrating modiñcations cf’construction4 and ar
in width with their associated treads I3 and have
rangement embraced within the inventive con
lengths» greater than the heights of their associ
ated- risers E14“, andare so related totheir` tread
The improved stair construction of'. the inven
tion includes stringerelements susceptible of con
and riser' portions as to assume substantially ver
45 tical -positions when the associated tread is hori
venient prefabrication from standard shapesand
zontally disposed.
sizes of structural units in lengths adjusted to the
span and anchorage characteristics of a given
flight installation, or in non-adjusted lengths
readily workable at the site for adaptation to 50
from-the associated’ treads I3 arel sloped or in
clined, as indicated aty I 6 in Figure 1, to such angle
with the plane ofthe associated tread I3 as the
specific installation requirements, and step units,
each embodying a tread and a riser portion, ar
ranged for convenient successive engagement` in
supported relation with a pair of such stringers
Ends of the webs. i5 remote
slope ofthe ñnished ñight isto make with the
horizontal, the longer side margin, ofk eachweb
i5 rising from and> extending aboveA the associatedy
riser te and the shorter web side margin rising
extending above the free edge of the
to complete the desired stair flight.
55 ssociated tread i3. Inwardly,adjacentandpar
The stair-flight-supporting stringers of the in
alleling the sloped margin I6 of each web I 5, lugs _
vention may be of any material, size, shape,- and
cr ears i? are provided in suitable fixed, projectf
specific construction suited to their function and
ing relation with one or both of the web surfaces,
cooperative relationship with the step units as
said lugs or ears being struck from rthe-material
hereinafter set'forth, it being fundamental to the 60 of'` thev webs, as shown, or otherwise formed, on. or`
secured to the web surfaces in any conveniently
effective manner to provide a web thickness
greater than the width of the` slot II in the
*Stringer 'wherewith the step unit is to be asso
through and longitudinally of the slots of said
stringers, and lugs outstanding from the stringer
engaging web portion faces cooperableinteriorly ,
of and with said stringers to inhibit weby dis
placement laterally and radially thereof.
ciated, The ‘ears or lugs I1 are so disposed and
arranged on each web I5 as to define by their
mergence with the web plane a line paralleling
2. A stair construction comprising ,a pair of
' like, hollow stringers each formed with an end-,
the sloped end I6 of the web, said line of mergence
opening, longitudinal slot, step units formed with
lying on the side of the lugs or ears I'I remote
from the sloped end I6 at a distance from said
end webs extending perpendicularly vfrom the
Ytread portions thereof engageable through and
sloped end corresponding with the depth of -the
longitudinallyof the Stringer slots in end-abutted,
Stringer interior chamber, so that, when a web I5
slidable relation with the slot-opposed Stringer
is edgewise engaged in the slot I'I of a Stringer II!
or I0' with its sloped end IB in sliding'relation
wall, and lugs outstanding from stringer-hous- A
able face portions of said webs disposed for co
with the unslotted side of saidstringenin the; 15 operation with interior slot margins to inhibit>
manner indicated at the upper end of Figure 1,
displacement of Said'webs laterally and radially
the earsor lugs I1 are disposed Within the Stringer
of said stringers. s
' chamber adjacent and in position to bear against
Y 3. In a stair construction, a pair of like, hollow
inner margins of the slot II where they serveÁ to
stringere, an end-opening slot longitudinally of
slida-bly mount the corresponding end Aof the step 20 each said Stringer, and a plurality of like step
unit on the associated Stringer and hold said step
units formed with end websextending perpen
dicularly from -the tread portions thereof succes'
unit against radial or lateral separation from the
sively engageable through and longitudinally of
said slots in slidably supported relation with said
With the construction and arrangement of ele- .
ments shown and above described, the Stair night 25
may be completed by suspending the successive
4. Ina stair construction, a pair of like, hollow
step units from and beneath a pair of Stringers '
stringers, a plurality of like step units, and means -
with their tread portions extending forwardly rel
for successively engaging Isaid units in slidably
ative to their associated riser portions, as shown
in Figures l, 2 and 3, or the stringers may be
supportedA relation
said ' stringers,A said
means comprising an 'end-opening' slot longitudi
nally of each Stringer, end webs on and extending
positioned with their slots opening upwardly, the
step units reversed, and the flight completed by
engaging the said units with and to rise above
perpendicularly from the thread portions of
said step units engageable through and longi
Y the stringers in such disposition as places the unit
tudinally of said slots'in end-abutted, slidable re-Y
tread portions in rearwardly extending relation 35 lation with the slot-opposed Stringer wall, and
with their associated riser portions, as shown in
lugs outstanding from the Stringer-housable web
portion faces disposedY vfor -slidable cooper
As is indicated in Figure 2, the completed flight
ation with interior slot margins;
may be arranged to dispose the stringers as hand
5. In a Stair construction, a pair of like, hollow
rails, the only variation in construction required 40 stringers, a plurality of Vlike step units presenting
being an increase in the length of the step unit
rigidly Aand perpendicularly interrelated tread
webs I5.
and riser portions, and means for successively
Figure 4.
The laterally-disposed meeting edges of adja
cent step units may be variously worked for such
structural cooperation as may be deemed de
engaging saidrunits in slidably supported relation
with said stringers to complete a stair flight, said
45 means comprising an end-opening'slot longitudi
sirable fol~ a given installation, it being essentially
,unnecessary that Said edges interengage other
than along a simple line of»y contact. However,
nally of each Stringer, end webs rigidly associated
with and extending perpendicularly from the
tread portion of each step unit forengagement ~`
as is indicated in the drawing, said edges may be
through said »Stringer slots, free end portions on
Y finished as correspondingly inclined flanges I8 50 said webs parallel to the slope of the stair flight
for slidable, step-positioning engagement against
adapted for surf ace interengagement and such in
terconnection, a-s «bymeans of studsçlugs, bolts,
rivets, welds, and the like, as 'may be desired.
the slot-opposed i Stringer wall, and lugs out- l Y
standing from the stringer-hous'able web portions
Vdisposed in spaced parallelism with the inclina-` ~
The step unit tread, riser, and web portions
maybe fabricated and finished in either, solid or 55 tion of the web free end for slidable cooperation
with interior slot margins.
' Y
skeleton form to function as exposed elements
6. In a stair construction having a pair of lik
for the purposes designed, or, as may be more
hollow stringers each formed with an end-open
cated and finished to receive, position, and sup ' « ing, longitudinal slot, a plurality of step'units suc-l
port covering material and elements, wear sur 60 cessively and slidably engageable in supported
relation with said stringers to complete a stair
faces, plastic compositions, and the like, in a
iiight, each of said step units comprising, in a
common and well-known manner.
rigid unitary assembly, perpendicularly-interreSince many changes, variations, and modiñca
Y generally the case, said portions may be fabri
lated tread and riserl portions,paralle1 end webs
tions in the specific form, construction, and ar
rangement of the elements Shown andvdescrib'ed 65 perpendicularly engaging withl Said ’tread and
ri's'er portions and extending longitudinally »be
may be had without departing from the spirit of
yond the associated riser, free end portions on
my invention, I wish to be understood as being
said webs parallel to the slope of the stair flight
limited solely by the scope of the appended claims,
¿ and engageable Vthrough the »Stringer slots, and
rather than by any details of the illustrative
showing and foregoing description.
70 lugs outstanding-from the stringeríhou'sable web
end portions disposed in spaced parallelism with
I claim as myinvention: '
the inclination ,of the web free end for slidable
l. Arstairv construction comprising a pair lof*
cooperation with interior slotrmargins.
hollow, longitudinally-slotted stringers, step units
formedwith end webs extending perpendicularly
from> theV tread portions thereof engageable
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