US2520452A - Demountable stair structure - Google Patents

Demountable stair structure Download PDF

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Publication number
US2520452A
US2520452A US548722A US54872244A US2520452A US 2520452 A US2520452 A US 2520452A US 548722 A US548722 A US 548722A US 54872244 A US54872244 A US 54872244A US 2520452 A US2520452 A US 2520452A
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tread
stair structure
demountable
stringers
sockets
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US548722A
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Sr Louis J Brune
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F11/00—Stairways, ramps, or like structures; Balustrades; Handrails
    • E04F11/02—Stairways; Layouts thereof
    • E04F11/022—Stairways; Layouts thereof characterised by the supporting structure

Definitions

  • Tins; invention relates to improvements in; stair ggnstructions.
  • The; primary object ofthis invention is the prcvisien ofa preferably concrete or plastic demountable stair structure-which may beassemor-d-isassembled by an unskilled person. It relatively simple (havingfew parts) and durable and maybe economically fabricated.
  • Figure 2 is a rear view of the assembled stair structure.
  • Figure 3 is a cross sectional view taken thru a portion of the stair structure substantially on the line 3--3 of Figure 2.
  • Figure 4 is a fragmentary cross sectional view thru the lower portion of one of the stringers of the stair structure.
  • Figure 5 is a fragmentary cross sectional view taken thru one of the inner connecting parts of adjacent step units.
  • Figure 6 is a perspective view of the intermediate step unit.
  • the letter A may generally designate the improved stair structure. It may include stringer or side wall units B and C supporting the lower and upper step units D and F respectively and intermediate step unit E.
  • step units are not to be restricted to any particular number of step units.
  • the side wall members will be of the same construction, and all intermediate step units will be of the same structure.
  • the top and bottom step units will differ slightly, as shown.
  • the concrete may be reinforced if desired.
  • Plastic material of any kind may also be used.
  • the side-wallste supports or-stringers Band 0' each include abody portion It nawmamseg and outer base flanges ltl and l2- alengthe lower margin thereof.
  • the stringer is stepped as stringers usually areto support the units D; E and F, including the vertical sides or engaging edges l Sand the horizontaltread-supporting sur faces H.
  • the latter surfacesl l areprovided with downwardly convergent tapered sockets 18 intermediate the ends of-- each of these surfaces ll.
  • one socket in eachhorizontial surface I! will suflice; altho-moresockets may beusedif desired;
  • the top surface H of the stringers B and Cterminates short of therear edge is of the body H11 and at this cornerthereis provided-a cut-out socket;
  • the lower step unit D- includes a vertical rises 25 and a horizontal tread 2G integral therewith. These portions 25 and 26 are of the desired thickness.
  • the riser 25 is plain, altho if desired it may be provided with base flanges.
  • the tread 26 on the under surface thereof at each side is provided with a depending frusto-pyramidal or tapered lug 30 adapted to seat in the lowermost stringer socket I8, as shown in Figure 1 of the drawings.
  • the tread 26 is furthermore provided along the rear marginal portion thereof with downwardly convergent tapered sockets or perforations 3
  • the intermediate step units E are formed somewhat similar to the step unit D, each including a riser portion 25 and a tread portion 26*.
  • the latter are provided with sockets 3
  • the feature distinguishing the intermediate step units from the lower step unit D is the provision of retaining lugs 40 on the lower edge of the riser 25* which are of frusto-pyramidal construction, the same as the lugs 3
  • the upper step unit F includes a riser 25 and a tread 26'.
  • the former is provided with the lower marginal frusto-pyramidal lugs 40 adapted for seating in the sockets of the next lower step unit tread
  • the tread 26 is provided with the frusto-pyramidal shaped stringer receiving lugs 30 adapted to seat in the sockets on the top edge l'l of the side walls or stringers B and C, as shown in Figure 3.
  • the distinguishing feature of the top ste unit F over the other step units is that the tread 26* along the rear margin thereof, is provided with a depending retaining skirt or flange, the entire width thereof, adapted to seat in the cut-out notches or sockets 20 at the upper rear corners of the stringers B and C.
  • the stringers B and C with the step units assembled as shown, will provide a sturdy and durable stair structure which obviously can be assembled or disassembled by an inexperienced person.
  • the device includes but a few number of parts compared to demountable stair structures of the prior art and it does not require a stabilizing foundation structure, since all of the parts are firmly interlocked.
  • Plastic or cement may be used in the sockets to additionally anchor the lugs if desired, altho such is not necessary.
  • a demountable stair structure comprising stringers having stepped tread mounting edges provided with laterally closed. convergently tapered sockets therein, individual step units each including integral riser and tread portions, the under surfaces of the tread portions having depending inverted pyramidal-shaped lugs interfitting in the sockets of the stringers, the riser portions at the loweredges thereof having inverted pyramidal-shaped retaining lugs thereon spaced from the stringers, and the tread portions of the step units below the uppermost step unit having along the rear margins thereof convergently tapered perforations extending through the tread portions from their upper surfaces to their under surfaces and receiving the depending lugs on the lower edges of the riser portions of 5 adjacent step units, whereby said perforations also provide drains, the stringers at the upper corners thereof being notched and the uppermost step unit having a skirt depending from the rear margin of the tread portion along the length thereof and fitting in said notches.

Description

Aug. 29, 1950 L. J. BRUNE, SR
DEMOUNTABLE STAIR STRUCTURE 2 Sheets-Sheet 1 Filed Aug. 9, 1944,
F IG 1.
FIG. 2.
INVENTOR.
LOUIS J. BRUNE,SR. wxfl A ORNEYS.
Aug. 29, 1950 BRUNE, 5 2,520,452
DEMOUNTABLE STAIR STRUCTURE Filed Aug. 9, 1944 2 Sheets-Sheet 2 FIG-.5.
lNVENTOR.
LOUIS J. BRUNE,SR.
/ ATTORNEYS.
Patented Aug. 29, 1950 STATES 2,520,452 nEMouNTABLE STATE swans-runs- Louis J. Brune, Sin, OceahSQr-ingall/I-iss,
Application August. .9, 194 $erialNo,
Tins; invention relates to improvements in; stair ggnstructions. The; primary object ofthis invention is the prcvisien ofa preferably concrete or plastic demountable stair structure-which may beassemor-d-isassembled by an unskilled person. It relatively simple (havingfew parts) and durable and maybe economically fabricated.
ig fur therobject of this invention is the provision-of a stair construction including a pluralityof= stringer and step units which are interconnected in such an efficientmanner as to provid a steady and durable stair structure which 9199s not require a concrete base or foundation. @therobjects and advantages of" the invention Wllllbfi apparent from the following detailed descript-ion.
In the accompanying drawings, forming a part of this specification, and wherein similar reference characters designate corresponding parts thruout the several views- Figure l is a side elevation of the stair structure showing the Various assembled details thereof.
Figure 2 is a rear view of the assembled stair structure.
Figure 3 is a cross sectional view taken thru a portion of the stair structure substantially on the line 3--3 of Figure 2.
Figure 4 is a fragmentary cross sectional view thru the lower portion of one of the stringers of the stair structure.
Figure 5 is a fragmentary cross sectional view taken thru one of the inner connecting parts of adjacent step units.
Figure 6 is a perspective view of the intermediate step unit.
In the drawings, wherein for the purpose of illustration is shown only a preferred embodiment of the invention, the letter A may generally designate the improved stair structure. It may include stringer or side wall units B and C supporting the lower and upper step units D and F respectively and intermediate step unit E.
It is understood that the invention is not to be restricted to any particular number of step units. However, in usual practice the side wall members will be of the same construction, and all intermediate step units will be of the same structure. The top and bottom step units will differ slightly, as shown.
It is preferred to construct the various units of the stair structure of concrete. The concrete may be reinforced if desired. Plastic material .of any kind may also be used.
1. Claim. (01. lg-e26?) The side-wallste supports or-stringers Band 0' each include abody portion It nawmamseg and outer base flanges ltl and l2- alengthe lower margin thereof. The stringer is stepped as stringers usually areto support the units D; E and F, including the vertical sides or engaging edges l Sand the horizontaltread-supporting sur faces H. The latter surfacesl l areprovided with downwardly convergent tapered sockets 18 intermediate the ends of-- each of these surfaces ll. Preferably one socket in eachhorizontial surface I! will suflice; altho-moresockets may beusedif desired; The top surface H of the stringers B and Cterminates short of therear edge is of the body H11 and at this cornerthereis provided-a cut-out socket;
The lower step unit D- includes a vertical rises 25 and a horizontal tread 2G integral therewith. These portions 25 and 26 are of the desired thickness. The riser 25 is plain, altho if desired it may be provided with base flanges. The tread 26 on the under surface thereof at each side is provided with a depending frusto-pyramidal or tapered lug 30 adapted to seat in the lowermost stringer socket I8, as shown in Figure 1 of the drawings. The tread 26 is furthermore provided along the rear marginal portion thereof with downwardly convergent tapered sockets or perforations 3|, shown in Figures 5 and 6 of the drawings, which are preferably extended the entire way thru the thickness of the tread to facilitate drainage, should such be needed.
The intermediate step units E are formed somewhat similar to the step unit D, each including a riser portion 25 and a tread portion 26*. The latter are provided with sockets 3| similar to the sockets 3| above described, and also retaining lugs 30 0n the under surfaces: for the stringers B and C. The feature distinguishing the intermediate step units from the lower step unit D is the provision of retaining lugs 40 on the lower edge of the riser 25* which are of frusto-pyramidal construction, the same as the lugs 3|] above described, adapted to seat in the sockets 3| or 3P as the case may be, of the tread of the next lower step unit.
The upper step unit F includes a riser 25 and a tread 26'. The former is provided with the lower marginal frusto-pyramidal lugs 40 adapted for seating in the sockets of the next lower step unit tread, and the tread 26 is provided with the frusto-pyramidal shaped stringer receiving lugs 30 adapted to seat in the sockets on the top edge l'l of the side walls or stringers B and C, as shown in Figure 3. The distinguishing feature of the top ste unit F over the other step units is that the tread 26* along the rear margin thereof, is provided with a depending retaining skirt or flange, the entire width thereof, adapted to seat in the cut-out notches or sockets 20 at the upper rear corners of the stringers B and C. It is apparent from the foregoing description that the stringers B and C, with the step units assembled as shown, will provide a sturdy and durable stair structure which obviously can be assembled or disassembled by an inexperienced person. The device includes but a few number of parts compared to demountable stair structures of the prior art and it does not require a stabilizing foundation structure, since all of the parts are firmly interlocked. Plastic or cement may be used in the sockets to additionally anchor the lugs if desired, altho such is not necessary.
Various changes in the shape, size and arrangement of parts may be made to the form of the invention herein shown and described, without departing from the spirit of the invention the scope of the following claim. I
I claim: I v A demountable stair structure comprising stringers having stepped tread mounting edges provided with laterally closed. convergently tapered sockets therein, individual step units each including integral riser and tread portions, the under surfaces of the tread portions having depending inverted pyramidal-shaped lugs interfitting in the sockets of the stringers, the riser portions at the loweredges thereof having inverted pyramidal-shaped retaining lugs thereon spaced from the stringers, and the tread portions of the step units below the uppermost step unit having along the rear margins thereof convergently tapered perforations extending through the tread portions from their upper surfaces to their under surfaces and receiving the depending lugs on the lower edges of the riser portions of 5 adjacent step units, whereby said perforations also provide drains, the stringers at the upper corners thereof being notched and the uppermost step unit having a skirt depending from the rear margin of the tread portion along the length thereof and fitting in said notches.
LOUIS J. BRUNE, SR.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 530,119 Niederlaender Dec. 4, 1894 534,462 Balsley Feb. 19, 1895 952,918 Mann Mar. 22, 1910 1,265,949 Osborn May 14, 1918 1,533,166 Daly Apr. 14, 1925 1,745,087 Floto Jan. 28, 1930 1,756,351 Gentile Apr. 29, 1930 1,954,722 Bateson et al. Apr. 10, 1934 1,964,660 Buzby June 26,1934 2,221,358 Neal Nov. 12, 1940 2,239,428 Michaud et al Apr. 22, 1941 2,262,127 Wolf Nov. 11, 1941 2,330,148 Rogge Sept. 21, 1943 FOREIGN PATENTS Number Country Date 49,538 Switzerland 1910 527,328 France of 1921 613,612 France of 1926.
US548722A 1944-08-09 1944-08-09 Demountable stair structure Expired - Lifetime US2520452A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3055146A (en) * 1958-10-17 1962-09-25 Lobato Florentino Concrete stairway
US3343316A (en) * 1964-10-14 1967-09-26 Frank C Mcintire Prefabricated step for stepway construction
US4417429A (en) * 1980-09-12 1983-11-29 Hans Stussi Freestanding stair assembly and riser therefor
US5713166A (en) * 1994-05-23 1998-02-03 Structures Monocoques Inc. Monocoque staircase and method for joining wooden pieces
US20040074167A1 (en) * 2000-09-25 2004-04-22 Andreas Drost Step stone for a stairway and a stairway assembled therefrom

Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US530119A (en) * 1894-12-04 Roofing-tile
US534462A (en) * 1895-02-19 Building-brick
US952918A (en) * 1906-07-24 1910-03-22 Oscar F Mann Building-block.
CH49538A (en) * 1910-01-17 1911-02-16 Otto Leube stairway
US1265949A (en) * 1917-07-07 1918-05-14 Charlie Kerr Mcgee Concrete door-step.
FR527328A (en) * 1920-11-18 1921-10-24 Marcel Georges Genty Fast and economical construction process of reinforced cement concrete frame trusses
US1533166A (en) * 1923-06-14 1925-04-14 Harry A Daly Concrete step
FR613612A (en) * 1926-03-24 1926-11-25 Wooden staircase made up of different pieces adjusted and assembled together step by step
US1745087A (en) * 1928-06-11 1930-01-28 Charles D Floto Concrete step and the like
US1756351A (en) * 1928-10-01 1930-04-29 Gentile John Concrete step
US1954722A (en) * 1932-07-30 1934-04-10 Bateson Paul Stairway construction
US1964660A (en) * 1932-05-25 1934-06-26 Joseph H Buzby Reenforced concrete stairs or steps
US2221358A (en) * 1938-10-07 1940-11-12 Neal Herman Ivy Doorstep for the home
US2239428A (en) * 1940-01-18 1941-04-22 Henry A Michaud Stair structure
US2262127A (en) * 1939-01-05 1941-11-11 Edward R Wolf Masonry building structure
US2330148A (en) * 1941-12-09 1943-09-21 Edward A Rogge Concrete step

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US530119A (en) * 1894-12-04 Roofing-tile
US534462A (en) * 1895-02-19 Building-brick
US952918A (en) * 1906-07-24 1910-03-22 Oscar F Mann Building-block.
CH49538A (en) * 1910-01-17 1911-02-16 Otto Leube stairway
US1265949A (en) * 1917-07-07 1918-05-14 Charlie Kerr Mcgee Concrete door-step.
FR527328A (en) * 1920-11-18 1921-10-24 Marcel Georges Genty Fast and economical construction process of reinforced cement concrete frame trusses
US1533166A (en) * 1923-06-14 1925-04-14 Harry A Daly Concrete step
FR613612A (en) * 1926-03-24 1926-11-25 Wooden staircase made up of different pieces adjusted and assembled together step by step
US1745087A (en) * 1928-06-11 1930-01-28 Charles D Floto Concrete step and the like
US1756351A (en) * 1928-10-01 1930-04-29 Gentile John Concrete step
US1964660A (en) * 1932-05-25 1934-06-26 Joseph H Buzby Reenforced concrete stairs or steps
US1954722A (en) * 1932-07-30 1934-04-10 Bateson Paul Stairway construction
US2221358A (en) * 1938-10-07 1940-11-12 Neal Herman Ivy Doorstep for the home
US2262127A (en) * 1939-01-05 1941-11-11 Edward R Wolf Masonry building structure
US2239428A (en) * 1940-01-18 1941-04-22 Henry A Michaud Stair structure
US2330148A (en) * 1941-12-09 1943-09-21 Edward A Rogge Concrete step

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3055146A (en) * 1958-10-17 1962-09-25 Lobato Florentino Concrete stairway
US3343316A (en) * 1964-10-14 1967-09-26 Frank C Mcintire Prefabricated step for stepway construction
US4417429A (en) * 1980-09-12 1983-11-29 Hans Stussi Freestanding stair assembly and riser therefor
US5713166A (en) * 1994-05-23 1998-02-03 Structures Monocoques Inc. Monocoque staircase and method for joining wooden pieces
US20040074167A1 (en) * 2000-09-25 2004-04-22 Andreas Drost Step stone for a stairway and a stairway assembled therefrom

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