US1870598A - Stair structure - Google Patents

Description

J. AMANN STAIR STRUCTURE Aug. 9, i932.

Filed April 8, 1951 /A/l//SA/ro JOHN HMA/wv. 5)/ ,49M

Patented Aug. 9, 1932 JOHN AMANN, F ST. LOUIS, MISSOURI STAIR STRUCTURE Application led April 8, 1931.

This invention relates to stair structures, and more particularly to a stair structure built of metal and concrete.

The primary obj ect of this invention is the development of a metal and concrete stair structure whereby the metal portion of the structure constitutes a complete, practical and serviceable stairway, which can be used during the process of construction of a building,

lo so that a temporary stairway is not necessary, nor is it necessary to provide temporary treads; and, which also provides a metal nosing that slidably interlocks with the metal tread when the concrete is poured, so that '1,5 when the concrete is poured, the nosing forms a complete protection to the front upper corner and face of the concrete.

A further object of this invention is to provide a metal nosing which is firmly and rigid- '20 llylheld in place without the use of rivets or o ts.

A still further object of this invention is to provide a combined metal tread and riser that interloclrs with the adjacent metal treads and risers without the use of bolts or rivets.

Other objects and yadvantages of this invention will be apparent from the specification, claims and drawing, in which Fig. l is a side elevation of a section of my '30 improved stair structure.

Fig. 2 is an enlarged side view of a section of my improved stair structure, showing a preferred method of interlocking the nosepiece.

Fig. 3 is a front view of my improved stair structure.

Fig. l is a bottom view of an interlocking slot through the sub-tread.

Fig. 5 is a modified form of the slot shown in Fig. 4.

F ig. 6 is a view of the nosepiece being interlocked with the sub-tread.

Fig. 7 is a side view showing a modified form of locking the nose-piece in place.

Fig. 8 is another modification of the slot shown in Fig. 4.

In the construction of new buildings, it is very desirable and advantageous to have the stairways built simultaneously with the erection of the walls, partitions, floors, etc., in

Serial No. 528,588.

order that they may be used by workmen and for the handling of materials. Where the nose-piece is permanently attached at the factory to the front edge of the step, it is necessary to build up the step with boards during the process of constructing the building, and even in this case, the nose-piece is frequently deformed and injured, as well as providing an extra. hazard to Workmen passing up and down.

To avoid this difficulty and to protectthe steps against damage, the construction herein described has been devised.

My preferred method of construction provides metal stringers l to which the steps are rigidly attached by bolts or rivets, or other suitable fastening means neither shown or claimed herein. The risers 2, preferably made of sheet metal, are integral with the 4 sub-tread 3, which is turned upwardly at right angles, as indicated at 4 to form both a protection for the rear side of the concrete step and to form an interlocking member or hook 5, which engages a similar hook 6 on the lower end of the nent` above adjacent riser 2, so that the steps are rigidly held in place and held together without the use of bolts or rivets.

Near the front edge of the sub-tread 3, a perforation 7 is provided, which may take the form of a quadrangular slotas shown at 8 in Fig. 5,'or it may be a quadrangular slot in which the metal is severed on three sides and pressed downward to form a lip 9, as shown in Fig. 8; or, it may take the form of two circles of different diameters joined together as indicated by l() in Fig. 8; or any other form desired that will perform the function of interlocking with a slidable nose-piece l1.

As illustrated in Fig. 2, the nose-piece is designed to protect the front edge of the concrete step and its upper end is turned inwardly at kright angles so as to form a protecting met-al edge upon the front upper marginal edges of the step or con-crete tread.

The lower portion 12 of the nose-piece is turned inwardly at right angles and is provided with an opening 13 near its inner end adapted to register with the perforation 7 in the sub-tread when the nose-piece 11 is moved inwardly before the concrete is poured.

Through the perforations 7 and 13, a locking member 14 is provided of a shape somewhat like an. inverted Z. hen the noscpiece 11 is moved inwardly, so that the slots 7 and 13 register, the locking member 14 1s insertedv and'then-thefnose-piece isslided out wardlyuntil the inner end of the nosepieee lies beneath the upper end of thelocking member 14. Y

A modified form of "the `vsame 'locking method consists of a perforation 10,shown.

in Fig. 8, near the front edge of the subtread and a locking member 15Y cylindricalin form and having a shoulder 16 and a head 17,"which`isfinserted through the largervdiametervof the perforation 10and thenslidablyumovedoutward sothat the shoulder :16 engages the smaller diameter of the perfo.- ration 10.

It .is obviousthat various other forms of locking members and ,pcrforations could be used'to carry out the same purpose. When the lnose-piece V11 lis put into posi- Y tion, the sub-tread 3, the nose-piece 1.1 and the upwardly turned rear portion of theLsubtread provide y'a form vinto which concrete is poured, the endsbeing closedby'the stringers 11.

Anothermodiiied form of nose-piece, not `shownzin the drawing,would consisteofrbending "the longer leg ofsnose-piece `downwardly f 'so as toiorm'a lock to engagerthe. slotted portion; 9, shown` in rFi'g.v 4.

1t istofbe observed 'that in each one locking means shown or described fitfis nec- 'essarythatthe nose-piecebe movedinwardly 'and thengslidably withdrawn Lfonward until the; locking members properly engage, and when the concrete is poured and sets the lockingimem'bers are firmly 'hel' iin place andithe `nosepiece is held rigidly against the -front side of the concrete step. Therefore, applicant Wishesy it understood that. hedoes not 'confine himself te either othelockingmeans hereinl'shown, but'rintends to claimf any inter'- locking means for the nose-pieceand yfor-fthe connection the vsub-tread vwith the riser that f involves a f sliding' movement r to f engage `Athem.

Having fully described my inventiomwhat claim as newand usefuly and desire'toprotectibyLettersL Patent is:

' 1'. Astair structurefof the classv described, `comprising side stringers,.metal step treads .cnmprising vat nhtangles Yinwar .saidsub-treadhaving itsr front marginal edge turned downwardly alt rightangles and terminating with an inwardly turned hook, thereby'to form ariser for the next below adjacent step, said last-named hook being adapted 5to interlock with said first-named hook'y of' the next below adjacent step, a slotted curvilinear nose-piece slidably interlockable with a companion slotfin said sub-tread,

a concrete upper tread superimposed upon '90 said sub-tread adapted to hold said nose- `piece permanently in locked position.

3. A'stair'stru'cture of the class described, compri singfmetal side stringers, integralsubtreads?.andrisers slotted to receive one end ofv al1-interlocking Amember, an 'independent y interlocking member adapted to slidably oin ksaid integral sub-treads andy risers with next adjacentrsub-treads and, risers, a metalnoseypiece slidabl-y interlockabl'e with said metal sub-treads,v a lockablemember adapted to slidablyinterlock said nose-piece and said slib-tread, 'aA concrete tread superimposed `upon said metal sub-tread, yhaving its front and its upper front edge protectedby said metalV nose-'piece andfhaving its rear and-'its upper marginal edge protected by the upturned portion of said metal tread.

In testimony whereof I have hereunto affixed my signature this 20th day of March,

J CHN AMANN.

slotted near theirfefront edges, `curvilinear 'members adapted to. cover the front and"A top marginal edges ofia concrete'vtrea'd vsuperimposed'upon said metal'trealds, saidcurvilinear membershaving their lower ends slotted f 'and turnedV atrightangles tothe vertical, so

that theV Vslot in.'A said curvilinear member regfisterszwithiheslot infsaid'tread, a curvilinearzlockingimember f adapted 'to engage the Slat in: said rcurvilinear member-"at one end

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