DE202020005339U1 - Kit stairs and modular stair system - Google Patents

Abstract

A kit stair (1), comprising two stair strings (2) and at least two step plates (20) which are fastened between the two stair strings (2) on the inner sides (3) of the stringer which lie opposite one another, the step plates (20) having an adjustable stair angle (11) are installed in relation to the stair stringers (2) along the inner sides of the stringers (3), each stair string (2) in the installed position at its lower cheek end (8) with a floor shoe (30) on a floor section (40) of a building or an open area is attached to form a stair angle (11) and at its opposite upper cheek end (9) is attached to a building part such as a building wall (45) or a pedestal (60) with a wall connection angle (50), characterized in that each wall connection angle (50 ) comprises a folding hinge (53), a first hinge wing (51) being fastened in the installed position on an end face (10) to the upper cheek end (9) of a stair cheek (2) and a second hinge wing (52) articulated to the first hinge wing (51) is attached to a building part (45), with two cover panels (54, 55) being arranged between the two articulated hinge wings (51, 52) which at least partially overlap, wherein the first cover panel (54) is attached to the first hinge wing (51) and the second cover panel (55) is attached to the second hinge wing (52).

Description

The invention relates to a kit staircase. In a further development of the invention, a modular stair system is specified which comprises at least one such kit stair with at least one stair landing adjoining the kit stair.

Numerous embodiments of kit stairs are already known from the prior art. For example, the US 2003/0093959 A1 a staircase consisting of a solid frame of metal struts, one of which is typically attached to a truss. Vertical step supports are attached along the stringers and each include upper and front flanges that can be attached to a step and to a riser of each step of the staircase. Various support systems, including a corner post and brackets attached thereto, are provided to support various horizontal and angled components of the frame of the stairs when the stairs are L- or U-shaped, making a turn in the stairs with widening steps and possibly also has a pedestal. If the staircase has an exposed side, various decorative or finishing wood components, including treads, risers, false or decorative stringers, moldings, etc., are provided to completely cover the metal structural frame including the stringers. At the outer or large ends of the corner steps, metallic L-shaped cheeks can be attached to the substructure of the apartment, which serve to support the steps instead of the step supports mentioned above.

The disadvantage of this design is at least that this staircase consists of numerous individual parts, each of which has to be cut off with a precise fit and, in some cases, precisely mitred, i.e. precisely adapted to the respective angle of inclination of the staircase. The assembly of such a staircase is therefore extremely complex and several skilled craftsmen are required. Another disadvantage is that the structural metal frame of the substructure is not shapely and therefore a wide variety of decorative panels and covers are required in order to be able to cover the underlying metal frame and the necessary fastening elements and thus to obtain a somewhat visually appealing staircase.

From the US 7,866,443 B2 For example, an adjustable stringer and railing construction is known. The assembly is adapted to use a pair of parallel stringer arms for each side of the stairs, a riser bracket for each staircase, and alignment and spacer elements for spacing the brackets along the stringer. The brackets include formations for spacing the cheeks from one another and for spacing adjacent brackets along the cheeks. The consoles are initially attached pivotably to each of the cheeks, so that they can be rotated about their pivot attachment when the cheeks move axially. The axial movement of the cheeks in relation to one another determines the angle of inclination of the stairs. Steps and risers are attached to the consoles to form the stairs, and railings can be attached to the stringer and group of consoles to complete the structure. The parallel cheeks, brackets and spacers are also used when preparing the formwork for pouring aggregate stairs, with the cheeks, brackets and spacers being reusable.

Also with this embodiment it is at least a disadvantage that the side stair strings have to be mitered exactly in order to adapt the strings to the respective individual angle of inclination of the stairs and to ensure a secure stand of the stair kit. Several skilled craftsmen are therefore required to assemble this stair kit with this version as well. Furthermore, fastening brackets are required as wall connection brackets in this staircase in order to be able to fasten the stair stringers at their upper end, for example to a building wall or a floor landing of a building. An aesthetically pleasing, elegant wall connection, in which fastening elements such as fastening brackets or fastening screws are invisible to the user, is thus the one from the US 7,866,443 B2 known execution is also not provided.

It is therefore the object of the present invention to provide a kit staircase which overcomes the disadvantages of the prior art mentioned at the beginning, in which in particular the wall connections at the upper end of the staircase are designed as elegantly as possible and without visible fastening elements such as fastening screws and which are particularly easy to assemble by anyone can without the stair stringers having to be mitred or skilled craftsmen being required for assembly. A further object of the invention is to specify a modular stair system which comprises at least one such kit stair with at least one stair landing adjoining the kit stair and which can be adapted particularly flexibly to a wide variety of installation situations.

These objects are achieved in a kit staircase according to the preamble of claim 1 with the features of the characterizing part of claim 1.

The subclaims relate to further particularly advantageous embodiments of the invention.

In a kit staircase according to the invention, which comprises two stair stringers and at least two step plates, the step plates between the two stair stringers being attached to their opposing inner sides of the stringers, and the step plates with an adjustable stair angle in relation to the stair stringers along the inner sides of the stringers, with each stair string being installed is fastened in the installation position at its lower end of the cheek with a floor shoe on a floor section of a building or an open area to form a stair angle and is attached to its opposite upper end of the cheek with a wall connection angle on a part of the building such as a building wall or a landing, each wall connection angle comprises a hinged hinge, wherein a first hinge wing is fastened in the installed position on one end face at the upper cheek end of a stair stringer and a second hinge wing articulated to the first hinge wing is attached to one Building part is attached, with two at least partially overlapping cover panels are arranged between the two articulated hinge wings, wherein the first cover panel is attached to the first hinge wing and the second cover panel is attached to the second hinge wing.

The use of wall connection brackets, which are designed as a folding hinge, offers the essential advantage that the stair stringers do not have to be mitred in order to assemble a kit staircase according to the invention. Experience has shown that this regularly leads to problems with conventional kit stairs, since do-it-yourselfers are usually overwhelmed when measuring a miter angle and cutting components to miter and therefore need professional help with assembly. In contrast to this, the modular staircase according to the invention offers the advantage that, depending on the installation situation and the chosen staircase angle, only the stair stringers have to be cut to length essentially perpendicular to their longitudinal direction. The wall connection brackets produce a compensation between the correspondingly cut end faces of the stair stringers at their upper string ends and the corresponding section of a building wall or a landing to which the kit staircase is to be attached. Advantageously, the two cover panels interlock at least in sections or overlap each other at least in sections, so that a visually continuous impression of the cover panels is created and the stair stringers appear as if they merge seamlessly into the adjacent masonry of the building wall or corresponding connection surfaces of a landing. Fastening means such as fastening screws, with which the wall connection angles are fastened to the building or platform and to the end faces of the stair stringers, are advantageously arranged invisibly below the cover panels in the installed position.

In a kit staircase according to the invention in the installed position, fastening screws for fastening the first hinge wing to the face of the stair string and fastening screws for fastening the second hinge wing to a part of the building can be covered invisibly by the two cover panels.

This embodiment offers the advantage that, in particular, the fastening screws at the upper end of the cheek, which are required for fastening the wall connection bracket, are arranged in a particularly attractive and invisible manner under the cover panels. The cover panels of the wall connection brackets also offer the advantage that the upper stringer ends do not have to be mitred according to the selected stair bracket, but rather a particularly elegant transition from the stair strings to a landing or a building wall on which the wall connection bracket is made thanks to the cover panels of the wall connection bracket are attached, is created.

In a further development of the invention, the two cover panels can each be designed in the form of circular sectors in a kit staircase and overlap each other in sections in a fan-like manner.

This embodiment offers the advantage that the cover panels overlapping one another in a fan-like manner together form a circular sector with a variable central angle or central angle. This means that common stair angles between 30 ° and 60 ° can usually be covered by the cover panels without any problems.

In a kit staircase according to the invention, at least one cover panel can particularly advantageously be adjustably and / or removably attached to a hinge wing.

To assemble or, if necessary, to dismantle a kit staircase, it is advantageous if one or both cover panels can be removed from the respective hinge wing without damage or moved accordingly in order to allow access to the underlying hinged hinge or the corresponding fastening screws.

A kit staircase according to the invention can be particularly stable if each stringer has at least three, preferably has five longitudinal grooves on its cheek inside and at least two, preferably three longitudinal grooves on its cheek outside.

Kit stairs, the stringers of which are made of aluminum profiles, have proven to be particularly effective. Such stair stringers are on the one hand light and on the other hand particularly robust and dimensionally stable. Appropriately, up to five longitudinal grooves are arranged parallel to one another and spaced from one another in the longitudinal direction of the stair stringer on the respective inner side of the stair stringer. This ensures that the kit staircase can be used with a flexible angle of incidence or staircase angle of 30 ° to 60 °, depending on the individual requirements. The up to five longitudinal grooves provided parallel to one another enable flexible assembly of the two or mostly more step plates, which for this purpose have fastening tabs on their underside with a bore and at least one or possibly also several elongated holes. Advantageously, depending on the stair angle or the inclination of the stair stringers, corresponding slot nuts can be used in the inside longitudinal grooves, which fasten the step plates with corresponding screws in a horizontal installation position. According to the current standard DIN EN ISO 14122-2 Thus, at least two different grooves are used on each cheek inside to attach the step plates.

Conversely, up to three longitudinal grooves, which are arranged parallel to one another and spaced apart from one another on the outer sides of the stair strings, offer the advantage that the floor shoe can be easily accessible by means of T-nuts, for example, attached to these outer longitudinal grooves, and its stair angle can also be adjusted from the outside using appropriate adjustments . In addition, the up to three outer longitudinal grooves are used for corresponding fastening options for railings, handrails or parapets, which can be easily accessible from the outside of the cheeks, if necessary only subsequently attached to the kit staircase or corresponding platform parts.

In the case of a kit staircase according to the invention, the floor shoe can expediently be fastened with T-nuts in the longitudinal grooves on the inside of the cheek and / or in the longitudinal grooves on the outside of the stringer.

It can be advantageous if, in the case of a kit staircase according to the invention, the floor shoe is continuously adjustable in a staircase angle of 30 ° to 60 ° measured with respect to the horizontal.

In a further development of the kit staircase, a railing with a handrail in the longitudinal grooves on the outside can be attached to at least one stringer on the outer side of the stringer.

The invention further relates to a modular stair system, comprising at least one kit staircase according to one of claims 1 to 8, and further comprising at least one platform with a step surface and with platform cheeks on at least one end face of the platform, the at least one kit staircase with its wall connection angles on a platform cheek of the pedestal is attached.

It is advantageous in such a staircase system that one or more kit stairs in interaction with one or more platforms, which are each arranged at the upper end of a kit staircase, enable a particularly flexible design of the most varied of staircase solutions. For example, outside stairs can be attached to building facades, with one or more platforms being provided. Each pedestal has a step surface and a pedestal cheek on at least one end face of the pedestal, the at least one kit staircase being fastened with its wall connection angles to a pedestal cheek of the pedestal.

In the case of a modular staircase system, the at least one pedestal can particularly advantageously be attached to a building wall by means of at least one triangular bracket.

Further details, features and advantages of the invention emerge from the following explanation of the exemplary embodiments shown schematically in the drawings.

In general, the assignment of the terms with regard to a location or an orientation, such as "horizontal", "vertical", "in the horizontal direction", "in the vertical direction", "above", "below", "in front", " below ”,“ above ”etc. are chosen for the sake of simplicity and these terms may relate to the representation in the drawings, but not necessarily to a current position of use or installation position of the kit staircase or a pedestal.

• - 1 in einer Schrägansicht von vorne eine Bausatztreppe gemäß der Erfindung in Einbaulage;
• - 2 in einer Detailansicht schräg von vorne einen Wandanschlusswinkel zur Befestigung einer Treppenwange an ihrem oberen Wangenende an einer Gebäudewand oder einem Podest;
• - 3 in einer Detailansicht einen Wandanschlusswinkel von der Seite;
• - 4 in einer Detailansicht schräg von vorne eine Innenseite eines Bodenschuhs;
• - 5 in einer Detailansicht schräg von hinten den in 4 gezeigten Bodenschuh von seiner Außenseite;
• - 6 in einer Detailansicht schräg von der Außenseite eine Bausatztreppe samt Bodenschuh in Einbaulage mit geneigtem Treppenwinkel;
• - 7 in einer Detailansicht schräg von der Innenseite eine Bausatztreppe samt Bodenschuh in Einbaulage mit geneigtem Treppenwinkel;
• - 8 in einer Detailansicht schräg von der Seite das obere Wangenende einer Bausatztreppe samt Wandanschlusswinkel in Einbaulage an einer Gebäudewand befestigt, wobei die Abdeckblenden durchsichtig skizziert sind;
• - 9 in einer Detailansicht schräg von der Seite das obere Wangenende einer Bausatztreppe samt Wandanschlusswinkel in Einbaulage an einer Gebäudewand befestigt, wobei die Abdeckblenden in Einbaulage die darunterliegenden Befestigungselemente abdecken;
• - 10 in einer Detailansicht schräg von der Seite das obere Wangenende einer Bausatztreppe samt Wandanschlusswinkel in Einbaulage an einem Podest befestigt, wobei die Abdeckblenden durchsichtig skizziert sind;
• - 11 eine Stirnseite einer Treppenwange;
• - 12 in einer Seitenansicht die in 1 gezeigte Treppe;
• - 13 in einer Schrägansicht von der Seite ein modulares Treppensystem mit einer Bausatztreppe sowie mit einem anschließenden Podest;
• - 14 in einer Seitenansicht ein Detail des in 13 gezeigten modularen Treppensystems;
• - 15 in einer Schrägansicht von oben das in 13 gezeigte modulares Treppensystem samt Geländer;
• - 16 eine Bausatztreppe von der Seite samt Geländer;
• - 17 die in 16 gezeigte Bausatztreppe samt Geländer schräg von der gegenüberliegenden Seite aus betrachtet.

In the drawings show:

• - 1 in an oblique view from the front a kit staircase according to the invention in the installed position;
• - 2 in a detailed view obliquely from the front a wall connection bracket for fastening a stair stringer at its upper stringer end on a building wall or a pedestal;
• - 3 in a detailed view of a wall connection bracket from the side;
• - 4th in a detailed view obliquely from the front, an inside of a floor shoe;
• - 5 in a detailed view obliquely from behind the in 4th shown bottom shoe from its outside;
• - 6th in a detailed view obliquely from the outside a kit staircase including floor shoe in the installation position with an inclined stair angle;
• - 7th in a detailed view obliquely from the inside a kit staircase including floor shoe in the installation position with an inclined stair angle;
• - 8th in a detailed view obliquely from the side, the upper cheek end of a kit staircase together with the wall connection bracket in the installation position attached to a building wall, the cover panels being outlined transparently;
• - 9 in a detailed view obliquely from the side, the upper cheek end of a kit staircase together with the wall connection bracket fastened to a building wall in the installation position, the cover panels covering the fastening elements underneath in the installation position;
• - 10 in a detailed view obliquely from the side, the upper cheek end of a kit stair including the wall connection bracket in the installation position attached to a pedestal, the cover panels being outlined transparently;
• - 11 one end of a stair string;
• - 12th in a side view the in 1 shown stairs;
• - 13th in an oblique view from the side, a modular stair system with a kit staircase and an adjoining platform;
• - 14th in a side view a detail of the in 13th modular staircase system shown;
• - 15th in an oblique view from above the in 13th shown modular stair system including railing;
• - 16 a kit staircase from the side with handrail;
• - 17th in the 16 The kit staircase shown, including the railing, viewed diagonally from the opposite side.

1 shows a kit staircase 1 according to the invention in the installed position. The kit stairs 1 includes two stringers 2 which are designed mirror-symmetrically and which are installed in the installed position on their opposite inner sides of the cheeks 3 five longitudinal grooves each 4th on the inside of each cheek 3 exhibit. The internal longitudinal grooves 4th are parallel to each other and at a distance from each other on the inner sides of the cheeks 3 the stair stringers 2 arranged. On the outside of the cheeks 5 every stringer 2 are three longitudinal grooves here 6th provided, which are also parallel to one another and spaced from one another on the outer sides of the cheek 5 are arranged. The internal longitudinal grooves 4th as well as the external longitudinal grooves 6th each extend in the longitudinal direction 7th the stair stringers 2 . The longitudinal direction 7th is in 1 as a dash-dotted longitudinal axis of the stair string 2 illustrated. Every stringer 2 has a lower end of the cheek in the installation position 8th as well as an upper end of the cheek 9 on.

In 11 is the front 10 the stringer 2 , which is designed here as an aluminum profile, for example. In this view is the arrangement of the five internal longitudinal grooves 4th as well as the three external longitudinal grooves 6th particularly easy to see.

Back to 1 is the kit staircase 1 in a stair corner 11 mounted from about 45 °. Between the two stringers 2 are several step plates 20th assembled. Every step plate 20th each has narrow sides 21 on, being on the narrow sides 21 at the bottom of the step plate 20th fastening straps each 22nd for mounting the step plates 20th on the inside of the cheeks 3 the stair stringers 2 to serve.

As in 7th The fastening straps are easily recognizable 22nd one hole each 23 as well as an elongated hole 24 to the step plates using T-nuts and corresponding screws 20th exactly in the horizontal position on the one in the installation position under the stair angle 11 inclined stair stringers 2 to be able to attach. The long sides 25th of the step plates 20th form the front of each of the step treads 26th .

As in 1 to recognize and in detail in the pictures 4th and 5 every stringer is illustrated 2 at the lower end of her cheek 8th each in a floor shoe 30th attached. The floor shoe 30th has a mounting bracket 31 with a swivel joint 32 on which a cheek retractor 33 is rotatably hinged. Three slot nuts 34 including the associated screw connection 35 serve here to attach the cheek retainer 33 in the three longitudinal grooves 6th on the outside of the cheek 5 a stringer 2 . For adjusting the stair angle 36 is in the mounting bracket 31 a curved elongated hole 37 provided, in which a fastening screw depending on the set stair angle 11 is fixed accordingly and thus the cheek retainer 33 in its angular position in relation to the mounting bracket 31 of the floor shoe 30th is fixed. The floor shoe 30th serves for fastening the kit stairs 1 on a section of floor 40 of a building or in an open area, for example on a floor section paved with concrete slabs or asphalt. For fastening the upper end of the cheek 9 on a building wall 45 a wall connection bracket is used 50 . This wall connection bracket 50 comprises a first hinge wing 51 and a second hinge wing 52 that look like a folding hinge 53 are rotatably hinged together.

With reference to the two illustrations 2 and 3 is a first masking panel 54 to do this on the first hinge wing 51 attached. Another second cover panel 55 is on the second hinge wing 52 attached. The two cover panels 54 and 55 are designed so that for common stair angles 11 from around 30 ° to 60 ° or for the corresponding opening angle of the hinged hinge 53 the two cover panels from 30 ° to 60 ° 54 and 55 an overlap area at these opening angles 56 ensure the two cover panels 54 and 55 thus overlap in sections in the installation position. This has the advantage that fastening screws in the installation position 57 that are used to attach the hinge wing 51 and 52 on the one hand on the front side 10 the stair stringers 2 and on the other hand on a building wall 45 or a pedestal are required, elegantly from the cover panels 54 , 55 to be covered. The hinge wings too 51 , 52 of the folding hinge 53 are covered accordingly.

In 2 is a cover panel for easier assembly 55 along the hinge wing 52 in the direction of the arrow 59 shown deducted. In this position you can get to the fastening screws during assembly 57 good for that.

In 3 is the wall connection bracket 50 shown in its installation position from the side. Compared to 2 here is the cover panel 55 again in the direction of the arrow 59 shown pushed back in their installation position. The two cover panels 54 , 55 are located with the formation of an intermediate overlap area 56 in their installation positions and close the opening angle between the two hinge leaves 51 , 52 completely off.

8th shows the upper end of the cheek 9 a kit staircase 1 including wall connection bracket 50 in the installation position on a building wall 45 attached, with the cover panels 54 and 55 are sketched with dotted lines that appear to be transparent. This will fix the fastening screws underneath 57 for attachment to one of the building walls 45 recognizable.

9 shows the upper end of the cheek 9 a kit staircase 1 including wall connection bracket 50 in the installation position on a building wall 45 attached, with the cover panels 54 and 55 Here, in the installation position, cover the fastening elements underneath invisibly. A particularly smooth and elegant transition from the stair stringers is advantageous 2 for connection to a building wall 45 reached.

10 shows the upper end of the cheek 9 a kit staircase 1 including wall connection bracket 50 in the installation position on a pedestal 60 attached, with the cover panels 54 , 55 are sketched with dotted lines that appear to be transparent. The podium 60 forms a step surface 61 at the top of the kit stairs 1 and is used to secure them. The wall connection bracket 50 are here with mounting screws 57 on platform cheeks 62 on the front sides of the pedestal 60 attached.

12th illustrates in a side view the in 1 Kit staircase shown 1 .

13th shows a modular stair system with a kit stair 1 as well as with a subsequent pedestal 60 . The wall connection bracket 50 the kit stairs 1 are on the pedestal cheeks 62 on the front sides of the pedestal 60 attached. The step surface 61 of the pedestal 60 is formed here, for example, by a grating.

14th shows in a side view a detail of the in 13th modular stair system shown. A triangular console 63 at the bottom of the pedestal 60 serves to support and fix the stair system. The triangular console 63 can be attached to a building wall, not shown here, for example.

15th shows that in 13th Modular staircase system shown including railings 70 . The railing 70 includes a handrail here 71 including handrail supports 72 and railing struts 73 .

16 shows a kit staircase 1 from the side including the railing 70 .

17th shows the in 16 Kit staircase shown 1 including railing 70 viewed obliquely from the opposite side.

List of reference symbols

1

Kit stairs

2

Stringer

3

Inside of the cheeks

4th

Groove on the inside of the cheek

5

Outside of the cheeks

6th

Groove on the outside of the cheek

7th

Longitudinal direction of the stair string

8th

lower end of the cheek

9

upper end of the cheek

10

Front side of the stair string

11

Stair angle

20th

Step plate

21

Narrow side of the step plate

22nd

Fastening strap of the step plate

23

drilling

24

Long hole

25th

Long side of the step plate, front

26th

Step tread

30th

Floor shoe

31

Mounting bracket

32

Swivel joint

33

Cheek retractor

34

Sliding block

35

Screw connection

36

Stair angle adjustment

37

Long hole

40

Floor section of a building, open space

45

Building wall

50

Wall connection bracket

51

first hinge wing

52

second hinge wing

53

Folding hinge

54

first cover panel

55

second cover panel

56

Overlap area

57

Fastening screw

59

Abziehrichtung (Doppelpfeil)

60

Podest

61

Trittfläche des Podests

62

Stirnseite des Podests, Podestwange

63

Dreieckskonsole

70

Geländer

71

Handlauf

72

Geländerstütze

73

Geländerstrebe

LIST OF LOCATION CHARACTERS (CONTINUED)

59

Pulling direction (double arrow)

60

Pedestal

61

Step surface of the pedestal

62

Front side of the pedestal, pedestal cheek

63

Triangular console

70

railing

71

Handrail

72

Railing support

73

Railing strut

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• US 2003/0093959 A1 [0002]
• US 7866443 B2 [0004, 0005]

Non-patent literature cited

• DIN EN ISO 14122-2 [0018]

Claims (10)

Kit stair (1), comprising two stair strings (2) and at least two step plates (20) which are fastened between the two stair strings (2) on the inner sides (3) of the stringer which lie opposite one another, the step plates (20) having an adjustable stair angle (11) are installed in relation to the stair stringers (2) along the inner side of the stringers (3), with each stair string (2) in the installed position at its lower cheek end (8) with a floor shoe (30) on a floor section (40) of a building or an open area is attached to form a stair angle (11) and at its opposite upper cheek end (9) is attached to a building part such as a building wall (45) or a pedestal (60) with a wall connection angle (50), characterized in that each wall connection angle (50 ) comprises a folding hinge (53), a first hinge wing (51) being fastened in the installed position on an end face (10) to the upper cheek end (9) of a stair cheek (2) and a second hinge wing (52) articulated to the first hinge wing (51) is attached to a building part (45), with two cover panels (54, 55) being arranged between the two articulated hinge wings (51, 52), which at least partially overlap, wherein the first cover panel (54) is attached to the first hinge wing (51) and the second cover panel (55) is attached to the second hinge wing (52). Kit stairs (1) according to Claim 1 , characterized in that, in the installed position, fastening screws (57) for fastening the first hinge wing (51) to the end face (10) of the stair string (2) and fastening screws (57) for fastening the second hinge wing (52) to a building part (45) of the two cover panels (54, 55) are covered invisibly. Kit stairs (1) according to Claim 1 or 2 , characterized in that the two cover panels (54, 55) are each designed in the form of sectors of a circle and overlap each other in sections like a fan. Kit stairs (1) according to one of the Claims 1 to 3 , characterized in that at least one cover panel (54, 55) is adjustably and / or removably attached to a hinge wing (51, 52). Kit stairs (1) according to one of the Claims 1 to 4th , characterized in that each stair stringer (2) has at least three, preferably five longitudinal grooves (4) on its inner side (3) and at least two, preferably three longitudinal grooves (6) on its outer side (5). Kit stairs (1) according to Claim 5 , characterized in that the floor shoe (30) can be fastened with T-nuts (34) in the longitudinal grooves (4) on the inner side of the cheek (3) and / or in the longitudinal grooves (6) on the outer side (5) of the stair stringer (2). Kit stairs (1) according to one of the Claims 1 to 6th , characterized in that the bottom shoe (30) is continuously adjustable in a step angle (11) measured with respect to the horizontal from 30 ° to 60 °. Kit stairs (1) according to one of the Claims 1 to 7th , characterized in that a railing (70) with a handrail (71) is fastened in the outer longitudinal grooves (6) on at least one stair stringer (2) on the outer side (5) of the stringer. Modular stair system, comprising at least one kit stair (1) according to one of Claims 1 to 8th , and furthermore comprising at least one platform (60) with a step surface (61) and with a platform cheek (62) on at least one end face of the platform (60), characterized in that the at least one kit stair (1) with its wall connection angles (50) is attached to a pedestal cheek (62) of the pedestal (60). Modular stair system according to Claim 9 , characterized in that the at least one platform (60) is attached to a building wall (45) by means of at least one triangular bracket (63).

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