FR3069559B1 - PREFABRICATED STAIRCASE COMPRISING A ROTATING QUARTER WITH ADJUSTABLE GIRON - Google Patents

Abstract

This prefabricated staircase comprising a quarter turn comprises a stringer (2) on which are fixed individually step trays (10 - 13, 18). The silt consists of a metal beam made by cutting and folding at least one sheet made in particular of steel, so as to define at least four receiving zones of the walking trays, able to ensure the rotating quarter. The walking trays are made of concrete or wood, at least four of which are adapted to said four zones of the slime to ensure the rotating quarter.

Description

PREFABRICATED STAIRCASE COMPRISING A ROTATING QUARTER WITH ADJUSTABLE GIRON

FIELD OF THE INVENTION The invention relates to a staircase of the type comprising a quarter turn, that is to say allowing rotation of the staircase. This staircase has an adjustable tread and stair step.

Furthermore, this staircase can be associated with a staircase of the right structural typealogue and that does not require for its establishment of heavy handling means, as conventionally implemented with the traditional prefabricated stairs.

PRIOR STATE OF THE TECHNIQUE

Prefabricated stairs are widely used today. They are mostly made of concrete. More particularly, when such stairshave a quarter turn, the entire constituent section of this quarter turn is traditionally monobloc, generating a significant weight, therefore requiring adapted handling tools, and further limiting the possibilities of adjustment of the girond'une hand and the height of the steps on the other hand, except to multiply the mills making it possible to make such turning quarters.

When, moreover, such rotating quarters are associated with straight sections, the connection between the upper or lower end of the rotating quarter and said right section causes difficulties, especially with regard to the need to ensure a cohesion and a mechanical strength of said staircase resulting therefrom. The object of the present invention is to overcome these disadvantages, on the one hand by promoting the construction and installation of such stairs, and on the other hand by allowing a simple way to propose a possible adjustment of both the tread and from the height of the steps.

DESCRIPTION OF THE INVENTION The invention proposes a prefabricated staircase comprising a silt, no longer made of concrete but of metal, on which are fixed individually steps notammentréalisés concrete or wood.

Thus, according to the invention, the support beam constituting the silt consists of at least one folded sheet, typically made of steel, defining: risers; zones for receiving and fixing the steps, and more specifically for walking platforms.

Thus according to the invention, the staircase comprises a rotating quarter, which comprises a limonconstitué of a metal beam made by cutting and folding of at least one sheet of steel, so as to define at least four receiving areas trapleaux of walking, able to ensure the quarter turn, walking trays estantréalisés concrete or wood, at least four of which are adapted to said four zones of the silt to ensure the rotating quarter.

In other words, the invention consists in providing a constitutive support beam dulimon, made by cutting and folding at least one sheet of steel, or even more, these cutting and folding operations to vary the height desmarches on the one hand, and by design also allows to vary the lap due to the chosen positioning of the trays on said silt.

According to a first embodiment of the invention, the constituent metal beam of the silt consists of a single metal sheet, cut and folded, such as to define the bottom of the silt and two side wings.

According to this embodiment of the invention, the reception zones defined by lelimon for the walking trays comprise a first support zone and take-off of said walking trays, and a second zone defining a notch oriented in a substantially vertical plane of width. corresponding substantially to the thickness of the step tray, notch within which said trays are slidable to a greater or lesser distance depending on the desired range. In doing so, it is possible to vary the superposition of the quarter-level leveling rollers with respect to each other as a function of the desired flange at the collar. As a reminder, the collar is the narrowest part of the steps of a staircase, including a spiral staircase.

Alternatively, the walking trays may not be glued to said first support zone, but reversibly fixed, for example by bolting, said trays on a plate fixed to the metal beam. The walking trays are then provided with one or more threaded inserts, through orifices correspondingly positioned in the plate.

In the configuration according to which the step trays are glued to the support zone of the riser, each of the step trays has on its lower surface, that is to say on its bearing surface, a notch or recess suitable for cooperate with a corresponding projection, emanating from the riser.

Said risers are also made of metal, and fixed between the two aforementioned lateral flanges, in particular by welding.

According to a second embodiment, the constituent beam of the slime is not made from cutting and U-shaped bending from a single sheet, but from cutting, folding and assembly of two sheets These L-shaped assemblies are assembled in particular by welding. The two sheets thus welded define the bottom of the silt and its lateral wings. The two lateral wings resulting from folding and cutting then define a receiving area of the walking trays.

This second embodiment makes it possible to significantly reduce the width of the immature and thus the space requirement associated with such an installation.

The ends of the two lateral wings, according to this second embodiment, are folded towards one another, to form a riser which is then integrated into the beam. The edge of the free ends of the wings, after folding, may be secured to one another, in particular by welding.

When the step trays are intended to be glued, they present by molding or by cutting, a protruding area extending in the plane of said plate, this groove depending shoulder function adapted to be received between the two lateral wings of the slime.

According to the second embodiment, bearing and securing surfaces of the step plates or plates are then fixed near the free end of the two lateral wings. The trays are then fixed to the silt by bolting on these surfaces.

According to the invention, straight sections of the staircase may be contiguous to the two ends of the quarter turn and for this purpose, the stringer comprises several pieces of outer beams assembled to each other in particular by bolting. The connection between the different beam sections is achieved by means of two plates and bolts.

BRIEF DESCRIPTION OF THE FIGURES

The way in which the invention can be realized and the advantages which result therefrom will emerge more clearly from the following exemplary embodiments, given by way of non-limiting indication in support of the appended figures.

Figure 1 is a schematic perspective representation of the quarter-turn staircase according to a first embodiment of the invention.

Figure 2 is a schematic perspective view of the silt of the staircase of the invention according to the first embodiment.

FIG. 3 is a diagrammatic representation in plan illustrating the positioning of the treads on the stringer according to the first embodiment.

FIG. 4 is a representation in a top plane illustrating, in particular, the overlapping of the step trays of a staircase of conventional construction and of a staircase according to the invention, still according to the same embodiment.

Figure 5 illustrates the assembly of two sections of the silt, respectively the quarter-turn limondu and the silt of a cross section.

Figure 6 is a schematic perspective view of the slime according to a second embodiment of the invention.

Figure 7 is a schematic perspective view of a walking tray of its inner face being attached to the slime.

Figure 8 is a view similar to Figure 7, said plate then being completely attached to the slime.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 shows a schematic perspective view of the quarter-turn staircase (1) according to a first embodiment of the invention. As already mentioned, this staircase is of prefabricated type, in that it includes a limonindépendé walking trays.

In the context of the invention, the silt is metallic. Once realized, it is moved onsite and placed, and independent walking trays (18) are reported and fixed on said silt once it fixed. Typically, the walking trays are made of concrete by molding but can also be made of wood by cutting.

The silt (2) consists of a metal beam made, according to this first embodiment, from a single plate of steel cut flat, for example using a numerically controlled machine. Once cut, this sheet is folded in U shape to define the bottom (3) of the silt, and two side wings (4 and 5), extending substantially perpendicular to the bottom (3).

These lateral wings (4, 5) have cutouts so as to define each a notch (6), extending substantially in a vertical plane, and whose function seradécrite later.

As can be seen in FIG. 2, said lateral wings (4) and (5) have cutouts such that they define at their upper free edge, resulting from the cutting of the sheet forming the silt, a surface horizontal support for the treads.

Furthermore, still according to this first embodiment, a riser (7), also made of metal, extended by a horizontal bearing surface (8) and take-off, is fixed between said lateral wings (4 and 5), in particular by welding.

It is easily understood that by acting on the numerically controlled cutting machine ensuring the cutting of the sheet forming the slime (2), it is possible to play on the height of the staircases in a simple manner, and thus to define the desired staircase in terms of such features.

The above abutment surfaces (8) are also used to receive the trays at which they are glued. Advantageously, the zone before the risers comprises a protrusion or outgrowth (9) directed upwards, able to cooperate with a complementary groove, formed on the underside of the walking trays to optimize the stability of the positioning of the latter on the slime.

According to another embodiment of the invention, more particularly described in connection with FIGS. 5 to 7, the silt is no longer formed of a single cut sheet which is folded into a U-shape, but of two sheets (24) and ( 25), cut and folded in the form of L. The method of cutting and folding is based on the same principle as that mentioned in relation to the first embodiment.

The two L-shaped sheets thus formed are assembled, in particular by welding, at the level of their horizontal bar to form the bottom of the slime (23). The free ends of the two lateral wings are folded towards one another, in order to put in contact their extreme edge, the latter can also be secured to one another, particularly by welding. They thus form a riser (26).

According to the same principle as described above, the cutting of the two plates (24) and (25) promotes the positioning of the walking trays and makes it scalable.

Support and securing surfaces (28) or plates pierced with through orifices (27) are then welded near the free ends of the two lateral wings in order to accommodate the step trays. These are provided with threaded inserts, able to pass through the orifices (27) of the plate (28), and to each receive a bolt fixation. Alternatively, screws (31) are inserted into threaded threads arranged within the bottom face (30) of the step plate after passing through said holes (27) of the plate (28). In order to facilitate the positioning and the fixing of the step tray on the plate, the two previous orifices of this last are replaced by luminescent openings (32), making it possible to slide said step tray already provided with the two corresponding screws (31) not completely screwed. When the step plate is correctly positioned on the platen, then bolt completely, with screwing of the third screw into the hole (27): see Figures 7 and 8. With regard to these trays, in the context of the Quarter turn of the invention, it is necessary to make at least four of different shapes, to adapt to the turn resulting from the rotating quarter. These trays are seen in plan in Figure 4 illustrating these different forms. More specifically, the step plate (10) is fixed and of determined size.

The other three trays (11, 12 and 13), as well as the step tray (10) are also made by molding and have different shapes.

In any case, each of these walking trays has, when it is to be fixed by gluing, a protruding zone (respectively 14, 15, 16 and 17) obtained by molding or by cutting, of length corresponding to the spacing between the two lateral wings (4 and 5), defining a shoulder for the purpose of being received between said lateral wings (4, 5), as can be seen in FIG. 4 and again favoring the stability of the positioning and fixing said walking trays within the silt (2).

In addition and as already indicated, the thickness of the step trays (10, 11, 12, 13, 18) corresponds to the clearance close to the width of the notches (6) defined by the lateral wings of the stringer (2).

Thus, except for the step board (10) which is fixed, due to the fact that it has the shape corresponding to the angle between two adjacent walls at which the staircase is installed, other walking trays can slide more or less important within said notches (6), to allow to vary the stair tread at the turn and in particular to maintain a constant tread on the stride line, that is to say, according to the resulting definition of standard EN 14843, the conventional line representing the usual trajectory of the users of the staircase.

In FIG. 3, the direction of superposition of the treads and, in particular, the upper treads (11 and 12) in the direction of the fixed step (10) and the lower plate (13) are shown in FIG. end of the fixed step (10).

This degree of superposition of the walking trays is established also according to the desired edge at the collar.

Moreover, and as shown in FIG. 5, the quarter-turn zone of the staircase described above can be connected to straight stair zones. For this purpose, it implements a slime, also consisting of a metal beam of the type described above, but this time linear, bolted (33) to the silt (2) to ensure cohesion to the whole. The trays then set up on straight cessions are of standard and constant format, their fixation and positioning on the other hand being similar to those described in connection with the foregoing description.

It is conceivable all the interest of the staircase according to the invention insofar as itpermet a simple way to have a quarter-turn staircase adjustable tread step height also adjustable.

In addition, optimization is also conceivable in terms of ease of movement and laying due to the relatively low weight of silt and walking trays to attach to said silt.

Claims (11)

1. Prefabricated staircase comprising a quarter turn comprising a stringer (2) on which are fixed unitarily step trays (10 - 13, 18), characterized in that: • the stringer consists of a metal beam made by cutting and folding at least one sheet, in particular made of steel, so as to define at least four receiving zones of the walking trays, capable of ensuring the quarter turn, • the trays are made of concrete or wood, of which at least four are adapted to said four areas of the silt to ensure the quarttournant. Prefabricated staircase according to claim 1, characterized in that the receiving zones defined by the stringer for the step trays comprise a first bearing zone and possibly a bonding zone for said step trays, and a second zone defining a notch (9, 29) oriented in a substantially vertical plane and of width substantially corresponding to the thickness doubleteau step, notch within which said trays are likely to slide along a more or less important distance - depending on the gironsouhaité. 3. Prefabricated staircase according to one of claims 1 and 2, characterized in that the silt (2) is obtained from the cutting and U-shaped bending of a single metal plate, the lateral wings (4, 5) resulting folding and cutting thus obtained defining a reception area trays trays. 4. Prefabricated staircase according to claim 3, characterized in that it further comprises risers (6), also made of metal, and welded to the seinde the metal beam constituting the mud between the lateral wings (4, 5). 5. Prefabricated staircase according to claim 4, characterized in that each of the walking boards has on its lower surface, that is to say on its face'support, a notch or recess able to cooperate with a correspondingillustration, emanating risers ( 6). 6. Prefabricated staircase according to one of claims 3 to 8, characterized in that the different step trays have, by molding or cutting, a projecting zone acting as a shoulder capable of being received between the two side wings (4, 5 ) of the silt, resulting from the folding of the cut sheet constituting the metal beam forming the silt. Prefabricated staircase according to claims 1 to 3, characterized in that lelimon (2) is obtained from cutting, folding and assembling, in particular by welding, two L-shaped sheets defining after welding, the bottom (23) of the silt and lateral wings (24, 25) resulting from the folding and cutting, defining a receiving area of the walking trays. 8. Prefabricated staircase according to claim 7, characterized in that the free ends of the lateral flanges (24, 25) are folded towards one another and optionally secured to each other, in particular by welding, so as to form a riser (26). ). 9. Prefabricated staircase according to one of claims 7 and 8, characterized in that the silt (2) receives a surface (28) or platen support and securing of the step boards, fixed in the vicinity of the free end of the wings lateral (24,25). 10. Prefabricated staircase according to claim 9, characterized in that the walking trays are fixed to the silt by bolting on the bearing surface and separating (28). 11. Prefabricated staircase according to one of claims 1 to 10, characterized in that the silt consists of several beam sections assembled to each other, in particular by bolting.