Straight staircase

Abstract

The invention relates to a straight staircase comprising: - two stringers (1) each extending along a longitudinal axis (A1), said longitudinal axes (A1) being parallel to each other; - a plurality of steps (2) fixed between the stringers (1); - at least one spacer (3) extending from one stringer (1) to the other along an axis substantially perpendicular to the longitudinal axes (A1) of the stringers; and at least one bracing element (4) extending from one stringer (1) to the other along an axis having a bracing angle (α) between 20 and 70° with respect to the longitudinal axes (A1) of said stringers, characterized in that said cross brace (3) includes a means for adjusting its width from among a list of predefined positions, and in that the staircase includes a means for adjusting the bracing angle (α) from among a set of predefined positions. Figure for the abbreviation: Fig 1

Description

Title of the invention: Straight staircase Technical field

[0001] The present invention relates to the field of metal staircases. More particularly, it relates to a straight staircase whose different parts are configured to be able to adapt its width.

[0002] The invention finds a particularly advantageous application for quickly producing a straight staircase with a specific width.

[0003] Furthermore, the invention aims more particularly at producing a solid and robust staircase, suitable for establishments open to the public or industrial sites. Prior art

[0004] Metal stairs are generally made to measure.

[0005] There are staircases of standard dimensions, but these can only be used for a limited number of applications. Either the installation site of the staircase is designed from the outset to correspond to these standard dimensions, which implies design constraints of this site which can lead to increased costs and / or non-optimal use of space. Or the installation site has not been designed to accommodate such a staircase, and it is then necessary to adapt this site to these standard dimensions, which implies the same disadvantages but requires in addition this adaptation step.

[0006] Custom-made staircases are generally ideal for the installation location. However, since they cannot be mass-produced, they are more expensive. Furthermore, these staircases are only manufactured to order, which means a long delivery time.

[0007] As described in patents FR 2 629 852 and FR 2 935 724, there are several types of straight stairs with an adaptable width.

[0008] A first technique consists of using stringers independent of each other.

[0009] For the purposes of the invention, the term “stringer” designates the upright(s) of a staircase that support the steps. Although a staircase may have a single central stringer, it typically has two parallel stringers. The stringers have a longitudinal axis connecting the threshold, aligned with the lower level, and a landing step, aligned with the upper level. Along this longitudinal axis, each stringer typically has an I-shaped profile with a central face on which the steps are fixed, an upper face on which a handrail can be fixed, and a lower face. To ensure the rigidity of the staircase, the stringers are typically connected by cross-braces and braces.

[0010] For the purposes of the invention, the term "spacer" designates the reinforcements extending substantially perpendicularly between the stringers and intended to oppose the forces which move the stringers apart. Solid staircases conventionally comprise several spacers fixed on the central faces of the stringers, facing one another.

[0011] The term "bracing" refers to reinforcements that extend at an angle typically between 20 and 70 degrees with the longitudinal axis of the stringers. These reinforcements oppose torsional forces and are typically attached to the lower faces of the stringers.

[0012] By using independent stringers, i.e. stringers which are not connected by spacers or bracing, it is possible to cut the steps according to the expected width to adjust the width of the staircase, as described in patent FR 2 629 852. However, this type of staircase is not sufficiently strong for a large number of applications, in particular for establishments open to the public or industrial sites.

[0013] In patent FR 2 000 974, it is proposed to use stringers with steps protruding on either side of the stringers, so that these steps can also be cut to the desired dimensions. Although it is possible to connect the stringers with spacers or bracing in this type of construction, the rigidity and strength of the assembly require the use of more massive parts, which increases material consumption and costs.

[0014] The technical problem of the invention is therefore to determine how to obtain a straight staircase with an adaptable width, which is solid. Statement of the invention

[0015] The present invention aims to address this technical problem by using a straight staircase comprising: - two stringers each extending along a longitudinal axis, said longitudinal axes being parallel to each other; - a plurality of steps fixed between the stringers; - at least one spacer extending from one stringer to the other along an axis substantially perpendicular to the longitudinal axes of the stringers; and - at least one bracing extending from one stringer to the other along an axis having a bracing angle of between 20 and 70° relative to the longitudinal axes of said stringers.

[0016] This staircase is particular in that said at least one spacer comprises a means for adjusting its width from a list of predefined positions, and in that the staircase comprises a means for adjusting the bracing angle. from a set of predefined positions.

[0017] Thanks to these provisions, almost all of the parts of the staircase are independent of its width, which allows the mass production of staircases of variable width, having the strength required for use in buildings or collective outdoor places, using an optimal quantity of material.

[0018] Said at least one spacer may comprise at least two longitudinal elements configured to slide relative to each other, a locking means for preventing the sliding of the longitudinal elements, a first longitudinal element comprising at least one fixing hole, a second longitudinal element comprising a plurality of fixing holes configured to cooperate with said at least one fixing hole of the first longitudinal element, the fixing holes of said second longitudinal element being more numerous than the at least one fixing hole of said first longitudinal element so as to define the predefined positions of said at least one spacer, which is a robust and effective means of implementing the means for adjusting the width of the spacer.

[0019] Said at least one bracing may comprise at least one fixing hole to each stringer, each stringer may comprise a plurality of fixing holes configured to cooperate with said at least one fixing hole of said bracing, the fixing holes of said stringer being more numerous than the at least one fixing hole of said bracing, at least a portion of the fixing holes of said stringer being distributed at different heights of said stringer so as to define the predefined positions of said at least one bracing, which is a robust and efficient means of implementing the means for adjusting the bracing angle.

[0020] The angle of inclination of the longitudinal axes of the stringers relative to the horizontal can be variable and defined from a list of predefined positions, which makes it possible to adapt the staircase according to the invention to the constraints of the installation location.

[0021] At least one step may comprise at least one set of at least two fixing holes to each stringer, said stringer may comprise at least two sets of at least two fixing holes, each set of fixing holes of the stringer being configured to cooperate with one of said at least one set of fixing holes of said step, each set of fixing holes of the stringer being configured to give a particular step angle to said step relative to said stringer, which is a robust and efficient means of varying the angle of inclination of the steps relative to the stringers among a list of predefined positions.

[0022] Said staircase may comprise two lower anchoring pieces each comprising a means of fixing to a horizontal surface, and each stringer may comprise at its lower end a lower connecting piece, said lower connecting piece being fixed to one of said lower anchoring pieces so as to be able to adjusting the height of said stringer relative to said horizontal surface, said height being defined from a list of predefined positions, said lower connecting piece comprising a plurality of fixing holes cooperating with at least one fixing hole of said anchoring piece, the fixing holes of said lower connecting piece configured to cooperate with said at least one fixing hole of said lower anchoring piece being more numerous than said at least one fixing hole of said lower anchoring piece, which makes it possible to adapt the staircase according to the invention to the constraints of the installation site.

[0023] Each stringer may comprise at its upper end two upper connecting pieces and a catch piece, a first upper connecting piece being able to comprise a horizontal part and / or a vertical part, said catch piece being able to be fixed on the one hand to said first upper connecting piece and on the other hand to a second upper connecting piece, the fixing of said catch piece to said first upper connecting piece and / or to said second upper connecting piece being carried out by a fixing means allowing at least two inclination positions of said catch piece relative to said first upper connecting piece or to said second upper connecting piece, said fixing means comprising a plurality of sets of at least two fixing holes each,the different tilt positions being each defined by a set of fixing holes, which is a robust and efficient way of adapting the connection of the top of the staircase to a horizontal surface, whatever the axis of inclination of the stringers.

[0024] Said staircase may comprise at least one handrail, and for at least one stringer, said stringer may comprise at its upper end a first upper connecting piece comprising a horizontal part, said staircase being able to comprise a vertical handrail support extending between said horizontal part and said handrail, the angle of said handrail relative to the vertical being adjustable, which makes it possible to produce a handrail accompanying the staircase up to the right of its upper part by a fixed piece, the angle of inclination of the stringers of the staircase being able to vary.

[0025] The present invention also relates to a method of manufacturing a plurality of straight staircases according to the invention, at least two staircases being of different widths, said method comprising the following steps: - manufacturing a plurality of pairs of stringers, each pair of stringers being identical, - manufacturing a plurality of identical spacers, the width of said spacers being variable, then for each staircase: - adaptation of the width of at least one spacer to the width of the staircase, then fixing said at least one spacer between two stringers.

[0026] Thanks to these provisions, several staircases of adaptable width can be manufactured with a large number of parts in common, which allows total or almost total production of the staircase in series.

[0027] Said method may comprise the following steps: - manufacture of a plurality of identical braces. then for each staircase: - fixing at least one brace between two stringers, the brace angle being adapted to the width of the staircase, which allows the advantage of manufacturing a large number of parts in series to be maintained while obtaining a more solid staircase.

[0028] Said method may further comprise the following steps: - manufacturing a plurality of steps of different widths corresponding to the widths of said stairs, then for each staircase: - fixing at least one step between two stringers, which is a robust and efficient embodiment of the invention.

[0029] The stringers of at least two staircases may have at least two different angles of inclination relative to the horizontal, said method possibly comprising the following step: - manufacturing a plurality of stringers each comprising a catch piece, a first and a second upper connecting piece, a lower connecting piece and at least one central element fixed between said second upper connecting piece and said lower connecting piece, said first upper connecting piece, said second upper connecting piece, said catch piece, said at least one central element and said lower connecting piece being identical for all the stringers, the fixing of the catch piece to the first upper connecting piece and / or to the second upper connecting piece being adapted for each staircase to the angle of inclination of the stringer relative to the horizontal, which makes it possible to adapt the connection of the top of the stairs to a horizontal surface, whatever the axis of inclination of the stringers,the stairs can be made up entirely or almost entirely of mass-produced parts.

[0030] Said method may comprise the following steps: - manufacture of a plurality of steps, the width of the steps being able to vary depending on the width of said stairs, then for each staircase: - fixing at least one step between two stringers, the angle of said step by relation to said stringers being adapted so that the step is horizontal, which makes it possible to adapt the angle of the steps in relation to the stringers, and therefore of the stringers in relation to the horizontal, the stairs being able to be composed entirely or almost entirely of parts manufactured in series. Brief description of the drawings

[0031] The present invention and its advantages will appear better in the following description of several embodiments given as non-limiting examples, with reference to the appended drawings, in which:

[0032] [Fig-1] [Fig.l] is a perspective view of a staircase according to a method of realization preferred embodiment of the invention,

[0033] [Fig.2] [Fig.2] is a perspective view of the lower part of the staircase of the [Fig.l],

[0034] [Fig.3] [Fig.3] is a side view of the lower part of the staircase of [Fig.l],

[0035] [Fig.4] [Fig.4] is a perspective view of a step of the staircase of [Fig.l],

[0036] [Fig.5] [Fig.5] is a view from below of the lower part of the staircase of [Fig.l],

[0037] [Fig.6] [Fig.6] is a partially exploded view of a spacer of the staircase of the [Fig.l],

[0038] [Fig.7] [Fig.7] is a perspective view of a detail of the upper part of the staircase of [Fig.l],

[0039] [Fig.8] [Fig.8] is a perspective view of the upper part of the staircase of [Fig.l],

[0040] [Fig.9] [Fig.9] is a perspective view of a detail of [Fig.9],

[0041] [Fig. 10] [Fig. 10] is a schematic side view of two consecutive steps of a staircase according to a particular embodiment of the invention. Description of the embodiments

[0042] In the illustrated embodiments, identical elements or parts bear the same reference numbers. Furthermore, terms which have a relative meaning, such as vertical, horizontal, right, left, front, rear, above, below, etc. must be interpreted under normal conditions of use of the invention, and as shown in the figures. The X, Y and Z axes are defined by an orthonormal reference frame illustrated in [Fig.l], the X and Y axes being horizontal and the Z axis being vertical. Furthermore, the geometric positions indicated in the description and the claims, such as “perpendicular”, “parallel”, “symmetrical” are not limited to the strict sense defined in geometry, but extend to geometric positions which are close, that is to say which accept a certain tolerance in the technical field considered, without influence on the result obtained.This tolerance is notably introduced by the adverb “substantially”, without this term being necessary. must be repeated before each adjective.

[0043] With reference to the figures, the staircase according to the invention comprises two stringers 1 extending along two parallel longitudinal axes, and a plurality of steps 2 extending between the two stringers in a horizontal direction parallel to the Y axis.

[0044] The stringers 1 are elongated elements located on each side of the staircase, extending mainly in a longitudinal direction parallel to a straight line which would pass through the center of the steps 2. The longitudinal direction of the stringers is perpendicular to the Y axis and inclined relative to the horizontal.

[0045] The steps 2 are horizontal, which is to be understood in the context of the present invention as the fact that their upper surfaces, on which the feet of a user rest to descend or ascend the staircase, are horizontal. This is also the case when the upper surface of the steps 2 does not correspond to a flat face, for example if the step is made with a metal grating.

[0046] The steps 2 are fixed to the stringers 1 and supported by the stringers 1. As illustrated in [Fig.4], the steps 2 preferably comprise a central part 2a, and two fixing pieces 2b, each fixing piece 2b being fixed on the one hand to the central part 2a, and on the other hand to one of the stringers 1. The fixing of the central part 2a to a fixing means 2b is done for example by two bolts passing through the fixing means 2b vertically along the Z axis and pinching the central part 2a, the two bolts being able to be aligned along the X axis. The fixing of a fixing means 2b to a stringer 1 is done for example by two bolts passing through the fixing means 2b and the stringer horizontally along the Y axis, the two bolts being able to be aligned along the X axis.

[0047] The steps 2 of the staircase according to the invention are preferably all identical in terms of dimensions and method of attachment to the stringers 1.

[0048] The staircase according to the invention is made up of parts, most of which can be common to staircases of different widths. Certain arrangements, described below, can be provided so that the width of the staircase according to the invention is adaptable. The width of the staircase, that is to say its dimension along the Y axis, is then preferably chosen from a list of predefined positions, for example corresponding to widths between 800 and 1400 mm. It can be provided, for example, that this list includes all the positions corresponding to widths between 800 and 1400 mm, in steps of 25 mm.

[0049] In the remainder of the description, the term “width” applied to any part designates its dimension along the Y axis.

[0050] The stringers 1 are preferably independent of the width of the staircase, so identical stringers 1 can be used for staircases of different widths.

[0051] The steps 2 must be adapted to the width of the staircase. Preferably, the The fixing parts 2b of the steps 2 are independent of the width of the staircase, and can therefore be used for staircases of different widths. Provision may be made for the central part 2a to be cut to the correct width to adapt to the width of the staircase. Alternatively, a modular central part 2a may be provided, with the addition of sub-parts to increase the width of the central part 2a. A central part 2a of variable width may also be provided, for example a telescopic central part 2a.

[0052] The staircase according to the invention comprises at least one spacer 3. The spacer 3 extends between the two stringers 1 in a direction substantially perpendicular to the longitudinal axes A1 of the stringers, parallel to the axis Y, preferably horizontal. The spacer 3 makes it possible to reinforce the solidity of the straight staircase. The spacer 3 comprises a means for adjusting its width, which makes it possible to use a single model of spacer 3 for several staircases according to the invention of different widths. The width of the spacer is defined from a list of predefined positions, in order to be adapted to the width of the staircase.

[0053] As illustrated in [Fig.6], the spacer 3 may comprise at least two longitudinal elements 3a, 3b whose relative positions can be modified in order to vary the width of the spacer 3. The longitudinal elements 3a, 3b are preferably configured to slide relative to each other, and the spacer 3 comprises a means for blocking this sliding. For example, the longitudinal elements 3a, 3b are fixed together by one or more bolts passing through fixing holes present in each longitudinal 3a, 3b along an axis perpendicular to the horizontal axis Y. A first longitudinal element 3a, for example, may comprise at least one fixing hole, and a second longitudinal element 3b may comprise a number of fixing holes greater than the number of fixing holes of the first longitudinal element.Thus, when assembling the spacer 3, it is possible to choose which hole in the second longitudinal element 3b to use for its attachment to the first longitudinal element, this choice determining the width of the spacer 3.

[0054] As illustrated in [Fig.6], the spacer 3 may comprise two second longitudinal elements 3b cooperating with a first longitudinal element 3a.

[0055] The staircase according to the invention may comprise a single spacer. If the staircase is of a certain length, it then preferably comprises several spacers 3, distributed over its height, with a preferably constant spacing between them, which may be between 800 mm and 1200 mm, for example 1000 mm.

[0056] The staircase according to the invention comprises at least one bracing 4. The bracing 4 extends between the two stringers 1 in a direction inclined relative to the longitudinal axes Al of the stringers 1 according to a bracing angle al of between 20 and 70°, shown as an example in [Fig.5]. The bracing 4 allows to reinforce the solidity of the straight staircase and in particular absorbs torsional forces. The staircase includes a means of adjusting the bracing angle al from a list of predefined positions. Since the length of the bracing 4 is fixed, the bracing angle al is directly related to the width of the staircase. By varying this angle, it is therefore possible to use a single model of bracing 4 for staircases of different widths.

[0057] The bracing angle al is determined when fixing the bracing 4 to the stringers 1. The bracing 4 is preferably fixed to the stringers 1 by one or more bolts passing through fixing holes present in the bracing 4 and in the stringers 1 along an axis perpendicular to the longitudinal axes of the stringers 1. For each stringer 1, the bracing 4, for example, may comprise at least one fixing hole, and the stringer 1 may comprise a number of fixing holes greater than the number of fixing holes in the bracing 4. Thus when fixing the bracing 4 to the stringers 1, it is possible to choose which holes to use on the stringers 1, this choice determining the bracing angle al, and therefore the width of the staircase.

[0058] The staircase according to the invention may comprise a single bracing 4. If the staircase is of a certain height, it then preferably comprises several bracings 4, distributed over its height, with a preferably constant spacing between them, which may be between 800 mm and 1200 mm, for example 1000 mm.

[0059] In a preferred embodiment, the staircase according to the invention is made up of parts, most of which can be common to staircases of different inclinations, the inclination of the staircase designating in the present invention the inclination of its stringers relative to the horizontal axis X. Certain arrangements, described below, can be provided so that the inclination of the staircase according to the invention is adaptable. The angle of inclination of the staircase is then preferably chosen from a list of predefined positions, for example corresponding to angles between 25 and 45°. It can be provided, for example, that this list includes 8 angles between 25 and 45°, or between 28 and 35°.

[0060] The steps 2 are preferably independent of the inclination of the staircase, identical steps 2 can therefore be used for staircases of different inclinations.

[0061] The steps 2 being horizontal, the inclination of the steps relative to the stringers 1 differs according to the inclination of the staircase. The stringers 1 may comprise a fixing system 1a allowing different inclinations of at least one step 2 relative to the stringers 1 according to a step angle a2 shown in [Fig.2]. In a preferred embodiment of the fixing system 1a, the step 2 is preferably fixed to each stringer 1 by at least two bolts passing through a set of fixing holes present in the step 2 and in the stringer 1 along the horizontal axis Y. The step 2, for example, may comprise at least one set of at least two fixing holes, preferably exactly two fixing holes aligned horizontally along the X axis. The stringer 1 may comprise at least two sets of fixing holes, each set being configured to cooperate with the set of fixing holes of the step 2. Thus, when fixing the step 2 to the stringer 1, it is possible to choose which set of fixing holes of the stringer 1 to use for its fixing to the step 2, this choice determining the inclination of the staircase.

[0062] In the embodiment illustrated in Figs. 3 and 4, the step 2 has two sets of two holes for fixing to the stringer 1, the four holes being aligned along the X axis, the first set comprising the two end holes and the second set comprising the two middle holes. This allows the corresponding sets of fixing holes on the stringer 1 to cover a wider variety of inclination angles without being too close to each other. Avoiding this proximity prevents overlapping of the fixing holes, or weakness in the stringer 1 in the vicinity of the fixing holes. In the example illustrated in [Fig.3], this allows for eight possible inclination angles, the angles being relatively close to each other.

[0063] The fixing system 1a, and therefore where appropriate the position of the fixing holes on the stringer 1, can be configured so that the relative position of the steps 2 complies with certain safety precautions, which may or may not be dictated by regulations.

[0064] The fixing system 1a can be configured so that the overlap R of the projection of two consecutive steps 2 on a horizontal plane, represented in [Fig. 10], has a dimension along the horizontal axis X greater than or equal to 50 mm.

[0065] The fixing system 1a can also be configured so that Blondel's law is respected for any set of two consecutive steps 2, that is to say that the sum of twice their vertical spacing E and their tread G, represented in [Fig.10], is between 600 and 640 mm, the tread being defined as the horizontal spacing between the two step noses.

[0066] The invention then makes it possible to create staircases of different inclinations from common parts, while ensuring, thanks to the precise drilling of the holes for fixing the steps 2 to the treads 1, preferably carried out in the factory, that these staircases do not pose any safety problems.

[0067] Each stringer 1 may comprise a central section, comprising a central element 1b or several central elements 1b fixed end-to-end, framed by a lower anchoring section, forming the lower end of the stringer 1, and an upper anchoring section, forming the upper end of the stringer 1.

[0068] Thanks to the fixing system 1a, unique models of central elements 1b can be used to manufacture stairs of different inclinations. The central elements 1b can be of different lengths, these lengths being determined by the number of steps 2 supported, for example 2, 3, 6 or 9 steps. Central elements 1b of different lengths can be present in the same staircase. A maximum length of 9 steps allows the central element to have a length of less than 3 m, which is an advantage for transport.

[0069] The lower anchoring section, illustrated by way of example in Figs. 2 and 5, preferably comprises a lower connecting piece 1e, on which a lower anchoring piece 5 can be fixed. The anchoring piece 5 comprises a means of fixing to a horizontal surface, for example at least one hole configured to cooperate with a vertical screw along the Z axis.

[0070] In a preferred embodiment, the attachment of the lower anchoring piece 5 to the lower connecting piece 1c is height-adjustable, which makes it possible to adjust the height of the stringer 1 relative to the horizontal surface. In a preferred embodiment, the lower anchoring piece 5 is preferably attached to each lower connecting piece 1c by at least one bolt, passing horizontally along the Y axis through a set of fixing holes present in the lower anchoring piece 5 and in the lower connecting piece 1c. The lower anchoring piece 5, for example, may comprise at least one set of at least two fixing holes, preferably exactly two fixing holes aligned horizontally along the X axis. The lower connecting piece 1c may comprise at least two sets of fixing holes, each set being configured to cooperate with the set of fixing holes of the lower anchoring piece 5.Thus, when fixing the lower anchor piece 5 to the lower connecting piece 1c, one can choose which set of fixing holes of the lower connecting piece 1c to use for its fixing to the lower anchor piece 5, this choice determining the height of the staircase relative to the horizontal surface. In the example illustrated in [Fig. 3], seven different heights of the anchor piece 5 relative to the stringer 1 are possible.

[0071] The lower connecting piece 1e may have a geometry depending on the inclination of the staircase, in order to present a horizontal bearing surface regardless of the angle of inclination of the staircase. In certain embodiments, a single model of lower connecting piece 1e may be used for staircases of different inclinations, the lower connecting piece 1e then comprising a system for fixing to the lower anchoring piece 5 identical or similar to the system for fixing the steps 2 to the stringers 1, making it possible to adapt the inclination of the anchoring piece 5 relative to the lower connecting piece 1e, the lower anchoring piece thus being able to bear on the horizontal surface.

[0072] The lower connecting piece may include means for fixing to a or more steps 2.

[0073] The upper anchoring section, illustrated by way of example in Figs. 7 and 8, preferably comprises two upper connecting pieces Id, 1c, connected together by a compensation piece If. The first upper connecting piece Id comprises a horizontal and / or vertical part to allow it to rest on an anchoring surface by means of or not of an upper anchoring piece 6. The second upper connecting piece Id connects the compensation piece If to the central section of the stringer 1. The inclination of the first upper connecting piece Id and / or of the second upper connecting piece 1c relative to the compensation piece If is adjustable, which makes it possible to adjust the relative inclination of the upper connecting pieces Id, 1c, so that whatever the inclination of the staircase, the horizontal and / or vertical surface of the first upper connecting piece Id, 1c is correctly inclined.Thus a single part model can be used for the catch piece If regardless of the inclination of the staircase, only the first upper connecting piece Id and / or the second upper connecting piece le having to be manufactured specifically according to the inclination of the staircase. To achieve this effect, the fixing means between the catch piece If and one of the upper connecting pieces Id, le, or between the catch piece If and the two upper connecting pieces Id, le, as illustrated in [Fig.7], may comprise a fixing means allowing an inclination adjustment. For example, this fixing means may comprise several sets of fixing holes, and the use of one of these sets defines the relative inclination of the two pieces If, Id, le fixed together.

[0074] The upper connecting pieces Id may, one of them or both, comprise means for fixing one or more steps 2.

[0075] The staircase according to the invention may comprise one or two handrails 7. The handrail 7 may be fixed to a stringer 1, by means of handrail supports 8 arranged on the stringers 1, the handrail supports 8 being oriented perpendicular to the longitudinal axes A1 of the stringers 1. In order to ensure the continuity of the handrail 7 up to the top of the staircase, the handrail 7 may be fixed to the upper anchoring section, for example to a first upper connecting piece Id comprising a vertical part, by means of a vertical handrail support 8a, illustrated in FIGS. 8 and 9. The handrail 7 being preferably parallel to the longitudinal axes A1 of the stringers 1, it has an angle of inclination relative to the horizontal axis X equal to the angle of inclination of the staircase.The means for fixing the ramp 7 to the vertical ramp support 8a may comprise a means for adjusting the inclination of the ramp 7 relative to the vertical ramp support 8a, this inclination having a ramp angle a3 shown in [Fig.9]. As illustrated in [Fig.9], this fixing means may for example comprise a connecting piece 8c movable in rotation about an axis A2 parallel to the axis ho-. Y-axis, the A2 axis can be materialized by a screw.

[0076] The staircase according to the invention may comprise one or two railings, on one or both sides of the staircase. The railings are preferably fixed to the stringers 1, for example by means of the railing supports 8, as illustrated in [Fig.l] and 8. The railings then comprise one or more profiles 9 whose longitudinal axis follows the inclination of the staircase.

[0077] The present invention provides a method for manufacturing several straight staircases of different widths, comprising the following steps: - manufacturing a plurality of pairs of stringers 1, each pair of stringers 1 being identical, - manufacturing a plurality of identical spacers 3, the width of said spacers 3 being variable, - preferably, manufacturing a plurality of identical braces. - manufacturing a plurality of steps 2, the steps 2 being either of variable width or of different widths corresponding to the widths of said stairs, then for each staircase: - adapting the width of at least one spacer 3 to the width of the staircase, then fixing said at least one spacer 3 between two stringers 1, - preferably, fixing at least one bracing 4 between two stringers 1, the bracing angle al being adapted to the width of the staircase, - fixing at least one step 2 between two stringers 1.

[0078] This manufacturing method can be adapted for the manufacture of stairs of different inclinations. To do this, the step of manufacturing the stringers 1 is replaced by the following step: - manufacturing a plurality of stringers 1 each comprising a compensation piece If, ​​a first and a second upper connecting piece Id, le, a lower connecting piece le and at least one central piece 1b fixed between said second upper connecting piece Ie and said lower connecting piece le, said first and second upper connecting pieces Id, le, said at least one central piece 1b and said lower connecting piece le being identical for all the stringers 1, the geometry of said compensation piece If corresponding for each staircase to the angle of inclination of the staircase.

[0079] The method of manufacturing stairs of different inclinations can also include the following steps: - manufacturing a plurality of steps 2, the width of the steps 2 being able to vary depending on the width of said stairs, then for each staircase: - fixing at least one step 2 between two stringers 1, the step angle a2 of said step 2 relative to said stringers 1 being adapted so that step 2 is horizontal.

[0080] The staircase according to the invention is preferably a metal staircase, that is to say that all its structural parts such as in particular the stringers, bracing, spacers, are metallic. Any metal can be used, in particular steel, stainless steel or aluminum. Other parts can be non-metallic, for example the steps which can be made for example of wood.

[0081] The present invention is of course not limited to the embodiments described but extends to any modification and variant obvious to a person skilled in the art within the limits of the appended claims. Furthermore, the technical characteristics of the different embodiments and variants mentioned above may be, in whole or in some cases, combined with each other.

Claims

Claims

1. Straight staircase comprising: - two stringers (1) each extending along a longitudinal axis (Al), said longitudinal axes (Al) being parallel to each other; - a plurality of steps (2) fixed between the stringers (1); - at least one spacer (3) extending from one stringer (1) to the other along an axis substantially perpendicular to the longitudinal axes (Al) of the stringers; and - at least one bracing (4) extending from one stringer (1) to the other along an axis having a bracing angle (al) of between 20 and 70° relative to the longitudinal axes (Al) of said stringers,

2.

3. characterized in that said at least one spacer (3) comprises a means for adjusting its width from among a list of predefined positions, and in that the staircase comprises a means for adjusting the bracing angle (al) from among a set of predefined positions.Straight staircase according to claim 1, wherein said at least one spacer (3) comprises at least two longitudinal elements (3a, 3b) configured to slide relative to each other, a locking means for preventing the sliding of the longitudinal elements (3a, 3b), a first longitudinal element (3a) comprising at least one fixing hole, a second longitudinal element (3b) comprising a plurality of fixing holes configured to cooperate with said at least one fixing hole of the first longitudinal element (3a), the fixing holes of said second longitudinal element (3b) being more numerous than the at least one fixing hole of said first longitudinal element (3a) so as to define the predefined positions of said at least one spacer (3). Straight staircase according to any one of claims 1 to 2, wherein said at least one bracing (4) comprises at least one fixing hole to each stringer (1), each stringer (1) comprising a plurality of fixing holes configured to cooperate with said at least one fixing hole of said bracing (4), the fixing holes of said stringer (1) being more numerous than the at least one fixing hole fixing said bracing (4), at least part of the fixing holes of said stringer (1) being distributed at different heights of said stringer (1) so as to define the predefined positions of said at least one bracing (4).

4. Straight staircase according to any one of claims 1 to 3, in which the angle of inclination of the longitudinal axes (Al) of the stringers (1) relative to the horizontal is variable and defined from a list of predefined positions.

5. Straight staircase according to claim 4, wherein at least one step (2) comprises at least one set of at least two fixing holes to each stringer (1), each stringer (1) comprising at least two sets of at least two fixing holes, each set of fixing holes of the stringer (1) being configured to cooperate with one of said at least one set of fixing holes of said step (2), each set of fixing holes of the stringer (1) being configured to give a particular step angle (a2) to said step (2) relative to said stringer (1).

6. Straight staircase according to any one of claims 4 to 5, wherein said staircase comprises two lower anchoring pieces (5) each comprising a means for fixing to a horizontal surface, and each stringer (1) comprises at its lower end a lower connecting piece (1e), said lower connecting piece (1e) being fixed to one of said lower anchoring pieces (5) so as to be able to adjust the height of said stringer (1) relative to said horizontal surface, said height being defined from a list of predefined positions, said lower connecting piece (1e) comprising a plurality of fixing holes cooperating with at least one fixing hole of said anchoring piece (5),the fixing holes of said lower connecting part (le) configured to cooperate with said at least one fixing hole of said lower anchoring part (5) being more numerous than said at least one fixing hole of said lower anchoring part (5).,

7. Straight staircase according to one of claims 4 to 6, in which each stringer (1) comprises at its upper end two upper connecting pieces (Id, 1e) and a catch piece (If), a first upper connecting piece (Id) comprising a horizontal part and / or a vertical part, said catch piece (If) being fixed on the one hand to said first upper connecting piece (Id) and on the other hand to a second upper connecting piece (le), the fixing of said compensation piece (If) to said first upper connecting piece (Id) and / or to said second upper connecting piece (le) being carried out by a fixing means allowing at least two inclination positions of said compensation piece (If) relative to said first upper connecting piece (Id) or to said second upper connecting piece (le), said fixing means comprising a plurality of sets of at least two fixing holes each, the different inclination positions each being defined by a set of fixing holes.

8. Straight staircase according to one of claims 4 to 7, wherein said staircase comprises at least one handrail (7), and for at least one stringer (1), said stringer (1) comprises at its upper end a first upper connecting piece (1e) comprising a horizontal part, said staircase comprising a vertical handrail support (8a) extending between said horizontal part and said handrail (7), the handrail angle (a3) ​​of said handrail (7) relative to the vertical being adjustable.

9. Method for manufacturing a plurality of straight staircases according to one of claims 1 to 8, at least two staircases being of different widths, said method comprising the following steps: - manufacturing a plurality of pairs of stringers (1), each pair of stringers (1) being identical, - manufacturing a plurality of identical spacers (3), the width of said spacers (3) being variable, then for each staircase: - adapting the width of at least one spacer (3) to the width of the staircase, then fixing said at least one spacer (3) between two stringers (1).

10. Method for manufacturing a plurality of straight staircases according to claim 9, said method comprising the following steps: - manufacturing a plurality of identical bracings (4). then for each staircase: - fixing at least one bracing (4) between two stringers (1), the bracing angle (al) being adapted to the width of the staircase.

11. A method of manufacturing a plurality of straight stairs according to any one of claims 9 to 10, further comprising the following steps: - manufacturing a plurality of steps (2) of different widths cor- corresponding to the widths of said stairs, then for each staircase: - fixing at least one step (2) between two stringers (1).

12. A method of manufacturing a plurality of straight staircases according to one of claims 4 to 8, the stringers (1) of at least two staircases having at least two different angles of inclination relative to the horizontal, said method comprising the following step: - manufacturing a plurality of stringers (1) each comprising a catch piece (If), a first and a second upper connecting piece (Id, 1c), a lower connecting piece (1c) and at least one central element (1b) fixed between said second upper connecting piece (1c) and said lower connecting piece (1c), said first upper connecting piece (Id), said second upper connecting piece (1c), said catch piece (If), said at least one central element (1b) and said lower connecting piece (1c) being identical for all the stringers (1), the fixing of the catch piece (If) to the first upper connecting piece (Id) and / or to the second upper connecting piece (1c) being adapted for each staircase to the angle of inclination of the stringer (1) relative to the horizontal.

13. A method of manufacturing a plurality of straight stairs according to claim 12, said method comprising the following steps: - manufacturing a plurality of steps (2), the width of the steps (2) being able to vary depending on the width of said stairs, then for each staircase: - fixing at least one step (2) between two stringers (1), the angle of said step (2) relative to said stringers (1) being adapted so that the step (2) is horizontal.

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