EP0312488B1 - Method and device to restore a staircase - Google Patents

Abstract

The invention relates to a method and a device to restore a staircase. The restoration is effected with the aid of new tread elements (14) which are laid on top of the old steps (11, 12) and are fixed thereto with the aid of tread profiles. The cavities remaining between the old steps, the new tread elements and the profiles are filled with an assembly foam (18) which has a reaction time of several hours and during this time undergoes at most a twofold increase in volume. As a result, it is possible to foam the old steps, the profiles and optionally the tread elements in place, subsequently to assemble and align the different parts precisely, and finally to allow the assembly foam to harden. The tread profile (1) possesses three legs (2, 3, 4) arranged above one another and parallel to one another and a profiled part (6) connecting the latter, which is provided on its visible side with at least one receiving groove (9) intended to receive a cover layer (7). <IMAGE>

Description

The invention relates to a device of the types defined in the preamble of claim 1.

For the renovation of old stairs with worn treads or treads made of concrete, it is known (DE-U 85 04 095) to place new tread elements on the old treads and to provide them with special, U or. Fasten W-shaped profiles to the tread elements and / or risers (bumpers) of the old stairs by screws. A weak point of the known renovation concept is that the profiles have to be made of metal, in particular aluminum, for reasons of stability and therefore are immediately noticeable even when using colored or coated materials, especially if the new treads consist of veneers, foils, carpets or the like in order to largely adapt them visually to the existing stair material. The profile as a whole, especially since it has a relatively large height, is visually an immediately striking foreign body, which further affects its acceptance by architects and homeowners.

Another problem with the renovation is that old stairs often creak because the tongue and groove connections between the old tread elements and risers have loosened. So far, people have been able to fix the loose connections with screws. Although this temporarily eliminates the creaking, experience has shown that the creaking noises resume after a more or less long period of time, often even to a greater extent, because the screws loosen again due to the vibrations constantly affecting the steps and then additionally give rise to the tongue and groove connections to creaking noises.

The invention has for its object to develop the device of the type mentioned using comparatively simple means to the effect that the stairs can be renovated quickly, with permanently good stability and with an appealing external appearance. If necessary, it should also be possible to avoid creaking noises before the renovation.

The characterizing features of claim 1 serve to achieve this object. Further advantageous features of the invention result from the subclaims.

• Fig. 1 eine erfindungsgemäß sanierte Treppe im Querschnitt;
• Fig. 2 die Einzelheit X der Fig. 1 in starker Vergrößerung;
• Fig. 3 in einer schematischen, perspektivischen Ansicht ein Mittel zum Vermeiden von Knarrgeräuschen;
• Fig. 4 eine schematische Draufsicht auf eine sanierte Treppe mit einer Abdeckung für eine gerundete Antrittsstufe;
• Fig. 5 eine schematische Ansicht etwa längs der Schnittlinie V-V der Fig. 4;
• Fig. 6 einen Schnitt ähnlich Fig. 1 im Bereich eines Podestantritts einer sanierten Treppe;
• Fig. 7 und 8 je einen Schnitt ähnlich Fig. 1 mit speziellen Ansatzstücken für Treppen mit Block- bzw. Keilstufen;
• Fig. 9 einen Schnitt ähnlich Fig. 1 durch eine aus Beton hergestellte Treppe mit Blockstufen;
• Fig. 10 einen Schnitt ähnlich Fig. 1 durch eine freitragende Treppe ohne Setzstufen;
• Fig. 11 bis 13 in vereinfachten, im übrigen der
• Fig. 1 entsprechenden Schnitten verschiedene Profile mit Aufnahmenuten für zusätzliche Deckschichten;
• Fig. 14 einen Fig. 1 entsprechenden Schnitt durch eine weitere Ausführungsform des Profils; und
• Fig. 15 die Einzelheit X der Fig. 14 in starker Vergrößerung.

The invention is explained in more detail below in connection with the accompanying drawing using exemplary embodiments. Show it:

• 1 shows a staircase renovated according to the invention in cross section;
• Fig. 2 shows the detail X of Figure 1 in a large magnification.
• 3 shows a schematic, perspective view of a means for avoiding creaking noises;
• Figure 4 is a schematic plan view of a renovated staircase with a cover for a rounded step.
• 5 shows a schematic view approximately along the section line VV of FIG. 4;
• FIG. 6 shows a section similar to FIG. 1 in the area of a pedestal of a renovated staircase;
• 7 and 8 each show a section similar to FIG. 1 with special attachments for stairs with block or wedge steps;
• 9 shows a section similar to FIG. 1 through a staircase made of concrete with block steps;
• 10 shows a section similar to FIG. 1 through a cantilevered staircase without risers;
• 11 to 13 in simplified, otherwise the
• 1 corresponding sections different profiles with grooves for additional cover layers;
• 14 shows a section corresponding to FIG. 1 through a further embodiment of the profile; and
• Fig. 15 shows the detail X of Fig. 14 in a large magnification.

1 and 2, a tread edge or tread surface profile 1 according to the invention, made of metal, in particular aluminum, contains an upper leg 2, a middle leg 3 and a lower leg 4. The legs 2 to 4 are arranged essentially parallel to one another and mostly different long. The middle leg 3 is the longest, the lower leg 4 is somewhat shorter. The shortest is the upper leg 2, which is provided on its surface with a corrugation or the like, which represents a slip protection. The outer ends of the legs 2 to 4 are connected by a profile part 6 which, according to FIG. 1, runs essentially perpendicular to these between the upper and middle legs 2 and 3, is curved like a fillet below the middle leg 3 and then along one with small radius of curvature formed bend 7 passes into the lower leg 4, so that there is a W-shape in the broadest sense. At the free end of the lower leg 4, a web 8 angled by 90 ° can also be connected. The existing from the legs 2 to 4, the profile part 6 and the web 8 profile 1 is made in one piece in great length and then cut into sections with a length corresponding to the width of the stairs to be renovated.

As shown in FIG. 2 in particular, the profile part 6 has a receiving groove 9 on its outside with a width of, for example, 0.6 to 3 mm. This receiving groove 9 is used to insert the upper end of a cover layer 10, which is indicated by dash-dotted lines in Figs. 1 and 2 and e.g. consists of a veneer, a decorative film, a monochrome film or the like. The cover layer 10 preferably hugs the outside of the entire section of the profile part 6 below the receiving groove 9 and the entire underside of the lower leg 4 and also extends over the entire length of the profile 1. The cover layer 10 is preferably by means of a the connection aluminum / wood or aluminum / plastic suitable special adhesive firmly connected to the profile 1. According to a particularly preferred embodiment, the cover layer 10 is also preformed in accordance with the curvatures of the profile part 6 and the bend 7, so that there is a permanently good fit. The preforming can be carried out with heating in steam or the like. The thickness of the cover layer 10, like that of the receiving groove 9, is preferably 0.6 to 3 mm, but other dimensions can also be provided for both. The attachment of the cover layer 10 to the profile 1 is advantageously carried out in the factory of the profile manufacturer, so that no additional work is required on the construction site and only the finished profile 1 needs to be used. The profile described with reference to FIGS. 1 and 2 for a step 11 is used in a corresponding manner for all other steps of the stairs to be renovated, as shown in FIG. 1 for a second step 12.

A refurbishment process using profile 1 according to the invention is explained in more detail below, the procedure generally being from top to bottom, i.e. Start with the top step and assume a staircase whose steps are provided with step edges (step) protruding beyond the risers.

First step elements 14 are cut to the required size and shape, these step elements 14 e.g. can consist of a particle board, in particular a fire-retardant, cement-bonded particle board, or a plate made of wood, plastic, marble, polymer concrete, veneered plywood or the like. Depending on the case, the surfaces of these plates can be covered with coverings 15 made of PVC, CV, linoleum, carpet, needle felt, rubber, nub material, tiles or the like, which often requires an associated so-called counter-pull 16 on the undersides of the tread elements 14 . This counter-pull 16 is preferably also covered with a sound-absorbing layer 17 made of cork or the like.

To assemble the new step elements 14, the surfaces of the old steps 11 and 12 are now foamed with a mounting foam and then the prepared new step elements are put on. The cavities between the legs 3 and 4 of the correspondingly prepared profiles 1 are then at least partially filled with assembly foam 18, while the cavities between the legs 2 and 3 are at least partially filled with a special adhesive 19 adapted to the material of the tread elements 14 and profiles 1 . The profiles 1 are then assembled in the manner shown in FIG. 1, the front edges of the new tread elements 14 between the legs 2 and 3 and the front and tread edges 11 of the old steps 11, 12 between the legs 3 and 4 come to lie, with the tread edges 11a projecting above the associated risers 22 to the front.

The step elements 14 and profiles 1 are now precisely aligned with a scale, and then the webs 8 are firmly screwed to the risers 21 (bumpers) of the old stairs by means of screws 20.

In order to avoid that the redeveloped stairs creak when walking on, an anti-creaking agent is introduced between the old stairs 11, 12. In the embodiment according to FIG. 1, this means consists primarily of a newly installed riser 22, which is clamped between the leg 4 of the profile 1 of the upper step 11 and the new step element 14 of the step 12 below it. Since the creaking of old stairs is mostly due to the fact that the tongue and groove connection 23, 24 between the old risers 21 and the old stairs 11, 12 located above them has loosened, the new riser 22 according to the invention has such a height h (FIG 1) Given that the old upper step 11 by a preselected amount of, for example 2 mm above the likewise old stair tread 12 underneath it, thereby loosening or releasing the tongue and groove connection 23, 24 by this amount. The assembly of the new, raised risers 22 is generally possible by simply lifting the respective upper step. Surprisingly, it has been shown that this measure, i.e. the spreading apart of the old stairs to a value that is slightly larger than before the renovation, the creaking of old stairs can be permanently eliminated.

To improve this effect, the invention can further provide, on the one hand, to choose the distance between the legs 3 and 4 of the profile 1 such that the assembly foam 18th at a point 25 can also penetrate into the space between the leg 4 and the lower edge of the old step 11. On the other hand, a reinforced layer 26 of assembly foam is applied in the area located under the new riser 22 between the upper edge of the lower step 12 and the new step element 14 placed thereon, whereby the overall effect of avoiding the creaking is increased.

In the embodiment according to FIG. 3, as a means of avoiding creaking, a device is arranged between a lower, old step 29 and an upper, old step 30, which consists of two wedge-shaped elements 31, 32, which e.g. are designed as plates with the contour of right-angled triangles, which lie against one another with their preferably serrated or corrugated hypotenuses. The one cathete of the element 31 is supported on the upper side of the lower step 29 and the one cathetus of the other element 32 is supported on the upper side of the upper step 30. Both elements 31, 32 are initially provisionally fastened to the old riser 34 by means of screws which are inserted through slots 33 running parallel to the hypotenuses and then shifted in the direction of the arrows in such a way that the upper step of the stairs is raised somewhat, and thereby the preselected dimension h is reached. Finally, the screws or further fastening screws inserted through bores 35 are tightened. The jags or the like formed along the hypotenuses prevent an unwanted change in the set dimension h. The elements 31, 32 can also be installed before the new tread elements 14 and profiles 1 are installed and can therefore be installed between the old risers and the webs 8, 8 or between these and the new risers 22, which in this case are only as Blindings work.

According to the described method, profiles 1 could also be installed in principle, which neither have the receiving grooves 9 and cover layers 10 nor the webs 8 and are attached with their legs 4 to the lower edges of the old steps 11, 12. In the event that a means of preventing creaking is provided, the use of profiles 1 according to FIGS. 1 and 2 is particularly advantageous. Since these means either have to be covered with additional damage, for example in the form of the new risers 22, or the new risers 22 themselves form the means for avoiding creaking, the same visible surfaces can be used with the cover layers 10 as with the help of the coverings 15 and the risers 22 are generated, so that there is an overall pleasing, consistently the same look.

The starting levels, i.e. the first steps of old stairs from below often have a semicircular curve at least at one end, which extends beyond the side cheeks. The refurbishment concept according to the invention therefore includes the following additional measures according to FIGS. 4 and 5. A staircase laid between two cheeks 36 and already renovated according to the invention has a step 37 which is rounded on one side. Since the profile 1 according to the invention can only be installed along the straight part 38 of the starting step, which ends approximately at a point 39, a hollow body-like cover 40 is attached according to the invention at this point 39, which has a substantially semicircular contour in plan view. The visible end wall 41 of this cover 40 is shaped according to FIG. 5 as the profile part 6 of the profile 1 used in the individual case, and therefore e.g. provided with a concavely curved outer surface 41, so that there is a kind of hollow cylindrical half-shell with the curved surface 41. The radius of this cover 40 corresponds to half the depth of the step 37. The cover 40 is attached to one end of the old step according to FIG. 4 and glued to it or connected in some other way. The cover 40 can accommodate any existing parts of the old step or can be made from a solid wooden body or the like, in which case the old step is milled accordingly. If a post 42 of a banister is additionally supported on the step 37, the new tread element and the cover 40 can be fitted with corresponding, e.g. be semicylindrical recesses which receive the post 42 in itself. This measure also has the advantage that the post 42 does not have to be dismantled during the renovation work. The height of the cover 40 is chosen so that its flat top is flush with the top of the associated new tread element.

5, the profile 1 according to FIG. 1 is indicated with dashed lines, from which it can be seen that the cover 40 can continue the outer surface of this profile without a substantially visible transition. In addition, the new riser 22 (FIG. 1) can be continued in the area of the arch by a corresponding, semi-ring-shaped cover 43 which is arranged below the cover 40 and how this can be preformed accordingly. This makes it possible to create the same outer surfaces in the area of the curves as with the cover layers 10 (FIG. 1), in particular to use the same materials for both. On the cover 40 or the old step can be applied before the assembly foam described, which forms a stabilizing layer 44 (Fig. 5) after curing.

Fig. 6 shows an essentially U-shaped profile 46, which differs from profile 1 mainly in that the middle leg (3 in Fig. 1) is missing. The profile 46 is preferably used at the landing 47 of the stairs to be renovated and also screwed to the upper leg 48 thereof, for which purpose this is provided with an extension having a screw hole in comparison with FIG. 1. The rest of the assembly is analogous to that of the profile 1, although no new tread element is generally required on the platform 47, in particular if the height compensation required by the renovation is brought about by other means.

7 shows how stairs 1 made of wood, stone, concrete or the like can also be renovated with block steps 50 with the aid of the profile 1 according to the invention. Because of their cuboid shape, the block steps 50 are not provided with tread edges projecting beyond their end faces 51 and therefore suitable for pushing on the profiles 1. According to the invention, therefore, special end pieces are provided which have a lower part 52 comparable with a riser and an upper part 53 comparable with a protruding tread edge, the parts 52, 53 preferably forming a one-piece end piece. This extension is e.g. by means of a dowel 54 and a fastening screw screwed into it, firmly attached to the end face 51 of the block step 50 to be renovated and preferably has a height which corresponds to the original height of the block step 50, the tread surface of which can be severely worn, as in FIG oblique line 55 is indicated. As a result, the part 53 comes to rest after its attachment, where the step edge 11 overhanging the riser 22 is arranged in the stairs according to FIG. 1, so that it can serve to attach the profiles 1 like this. Otherwise, the renovation of such stairs proceeds as described above with reference to FIG. 1.

8 schematically shows the renovation of a staircase with wedge steps 58, which differ from the block steps 50 according to FIG. 7 only in that their end faces 59 do not run vertically, but are beveled in a wedge shape from top and front down and back. In order to be able to use profiles 1 with such wedge steps 58 and to be able to use the described method, end pieces are provided with parts 60 corresponding to parts 52 according to FIG. 7 and parts 61 corresponding to parts 53 according to FIG. 7. The only difference from FIG. 7 is that the parts 60, 61 have a wedge-shaped or oblique rear wall corresponding to the end wall 59.

The preferably one-piece extensions 52, 53 and 60, 61 preferably consist of solid wooden blocks. This also results in the renovation of stone or concrete stairs the advantage that the webs 8 of the profiles 1 can be attached to the extensions with simple wood screws 62 and no additional holes need to be drilled in the old block or wedge steps 50, 58 .

Fig. 9 shows a staircase made in a new building by means of a concrete formwork in block construction. In contrast to FIGS. 7 and 8, such a staircase can also be refurbished with the profiles according to the invention in that a board 66 made of wood or the like is fastened on the treads of its steps 65 by means of screws 67 which fasten the end faces 68 of the steps 65 protrudes corresponding to the usual wooden stairs according to FIG. 1 and thereby forms an extension 66a for the profiles 1 as a replacement for the missing step edge. The end face 69 of the board 66 is preferably beveled downwards and inwards in accordance with FIG. 9, so that there is no excessively large cavity between it and the concave profile part 6 of the profile 1. The board 66 can serve as protection for the treads of the steps 65 during the construction work and can be covered with a tread surface element 70 after completion of the construction work in the sense of the method described with reference to FIG. The front end can form a riser 71. In this case, a layer 72 of cork or the like must be provided on the underside of the board 66, which can create the necessary vapor diffusion compensation between the concrete step and the board 66.

The embodiment according to FIG. 10 serves to renovate a cantilevered staircase without risers. In this case, a profile 74 corresponding to profile 1 is provided with a shortened web 75. Since the riser otherwise used to secure it is missing, a holding block 77 made of wood or the like is attached to the underside of an old stair step 76 by means of screws 78. The holding block 77 has on its front side an L-shaped groove 79, the cross-sectional shape of which corresponds to the cross-sectional shape of the web 75 and an immediately adjoining lower leg 80 of the profile 74. To assemble the holding block 77, this is pushed from the side with its groove 75 onto the web 79 before or after the foaming of the profile 74 and, after the assembly of the profile 74, is fastened to the underside of the old step 76. Due to the L-shape of the groove 79, the profile 74 is thereby immovable in the horizontal direction on the step 76 fixed.

While in the embodiments according to FIGS. 6 to 10 the receiving grooves 9 for the cover layers 10 have each been omitted, FIGS. 11 to 15 show further embodiments for the receiving grooves and cover layers. 11 shows a profile 82 with a receiving groove 83 which, in contrast to the receiving groove 9 (FIG. 1), is arranged at the uppermost end of the profile 82 and essentially in the extension of an upper leg 84. An end-side profile part 85, which is concavely curved in accordance with FIG. 1, has in a central section a spring 86 projecting outwards, preferably extending over the entire length of the profile, while a cover layer 87, e.g. consists of a several millimeter thick, bendable or preformed plate made of wood, PVC, cork or the like, is provided at a corresponding point with a preferably continuous groove 88. A lower leg 89 of the profile 82 has a further, preferably continuous receiving groove 90 in the transition area to the profile part 85, into which the lower, appropriately adapted end of the cover layer 87 can be pressed. To assemble the cover layer 87, this is first inserted into the receiving groove 83 with its upper end milled out, if necessary, then pressed with its groove 88 onto the spring 86 and finally pressed into the second receiving groove 90 with its lower end. With appropriate dimensioning of these parts, the cover layer 87 is therefore also held mechanically on the profile 82, although the opposing surfaces of the profile part 85 and the cover layer 87 are appropriately additionally coated with a special adhesive before assembly.

FIG. 12 shows a profile 93 which differs from profile 1 according to FIG. 1 essentially by a flat profile part 94 which runs obliquely from top and front down and back. The profile 93 also has a receiving groove 95 corresponding to the receiving groove 9 (FIG. 1), a spring 96 corresponding to the spring 86 (FIG. 11) and an outwardly projecting extension 97 attached to the lower end of the profile part 94. A cover layer 98 is provided with a groove 99 corresponding to the groove 88 (FIG. 11), which forms a tongue and groove connection with the spring 86 after assembly. The lower end of the cover layer 98 has a recess receiving the shoulder 97 and a second groove which is open at the bottom. On a lower leg 100 of the profile 93, a further cover layer 101 is provided which, at its end projecting beyond the shoulder 97, has a web 102 which can be inserted positively into the second, downwardly projecting groove of the cover layer 98.

The assembly is advantageously carried out in such a way that first the cover layer 98 is mounted, then the cover layer 101 is placed on the leg 100 and at the same time the web 102 is inserted into the corresponding groove of the cover layer 98 and finally the cover layer 101 is attached to the leg 100 by gluing or screwing becomes. An adhesive layer can additionally be provided between the cover layer 98 and the profile part 94. The veneer described has the advantage that the front cover layer 98, which is sensitive to loosening, is additionally held in position by the second cover layer 101.

The cover layer 98, as shown in FIG. 12, is, for example, of a wedge shape in such a way that its front end face 98a is arranged essentially vertically despite the inclined web part 94 after assembly. The cover layer consists e.g. from a solid, a few millimeters thick wooden body. With the help of such cover layers, it is therefore possible not only to change the external appearance, but also the course or the external shape of the end faces of the steps to be renovated.

In order to prevent the profile 93 from buckling or otherwise being damaged in the area of the connection between a central leg 103 and the profile part 94 and thereby transferring a major part of the load to the old steps, these two parts are preferably additionally provided by a continuous stiffening web 104 connected so that a hollow chamber profile is formed at this point. Alternatively, a plurality of stiffening webs arranged next to one another can be provided. In contrast, when using profiles 1 (FIG. 1) with their concavely curved profile parts 6, such stiffening webs are generally not necessary, since with the profile parts 6 the forces exerted on the tread elements are automatically transferred to the old risers 21 and thereby the old ones Stair steps 11, 12 are largely relieved.

According to FIG. 13, a profile 105 essentially corresponds to that according to FIG. 11 with the difference that a front profile part 106 like the profile part 94 according to FIG. 12 is essentially flat or not curved. Correspondingly, a cover layer 107 consists of an essentially flat or plane-parallel plate, the fastening of which essentially corresponds to the fastening according to FIG. 11. In addition, stiffening webs 108 are provided according to FIG. 12.

The embodiment according to FIGS. 14 and 15, for which the same reference numerals are used for the same parts as in the embodiment according to FIGS. 1 and 2, differs from this essentially by the different design of a profile part 110 corresponding to the profile part 6. This is between the upper and middle Schen kel 2 and 3 also arranged substantially perpendicular to this and passes below the leg 3 along a convex arc 111 formed with a large radius of curvature in the lower leg 4. This sometimes gives a more pleasing appearance, especially when it comes to the renovation of comparatively large, massive wooden stairs. In addition, the application of a cover layer 112 is considerably simplified, since this is automatically pulled onto the sheet 111 when a tensile force is exerted and can therefore be better fitted to the profile part 110. 1 and 2 over the entire length of the profile and at the height of the middle leg 4 arranged receiving groove 113 is used to insert and fix the upper end of the cover layer 112, while its other end between the legs 4 and the new riser 22 can be clamped.

The renovation of stairs using the profiles described with reference to FIGS. 6 to 15 can in each case be carried out analogously to the procedure described with reference to FIG. 1.

The attachment of the receiving grooves according to the invention makes it possible to cover most of the visible surfaces of the profiles with cover layers whose appearance and material are adapted to the surfaces of the surface coatings used for the tread elements and risers or other stair components. Therefore, the overall impression of the old staircase can either be left largely unchanged or be changed uniformly. The cover layers in the lower part only need to reach the new riser. In the upper part, the cover layers preferably extend up to about the point where the middle legs adjoin the front, front-side profile parts, since it is generally tolerated that refurbished steps have a closing edge which is made of a metal or one in comparison to the rest Stairs are made of different materials, although with the embodiment according to FIG. 11 a practically complete covering of the profiles would also be possible. Otherwise, the receiving grooves have the advantage that they prevent the ingress of water, e.g. when cleaning, in the spaces between the profiles and the cover layers and thus prevent any swelling of the cover layers. In addition, protruding cover layer edges or complex work steps for cleanly milling off the cover layers at their ends are avoided.

The invention is not limited to the exemplary embodiments described, which can be modified in many ways. This applies in particular to the various receiving grooves, cover layers and the like. But also e.g. the means for preventing creaking described with reference to FIGS. 1 to 3 could be designed differently, since all devices suitable for spreading apart adjacent stair steps can be used for this purpose.

Claims (9)

1. A device for renovating stairs, having a tread profile (1, 46, 74) which either has three legs (2, 3, 4) - arranged substantially one above the other and parallel to one another - and a profile part (6) connecting the legs, the upper and the middle legs (2, 3) being intended to grip around a new tread element (14) and the middle and the lower legs (3, 4) being intended to grip around a projecting step edge (11 a) of the step, or for renovating stairs in the region of their upper landing is constructed without the middle leg, characterized in that the profile part (6, 85, 94, 106, 111) has - on its visible side - at least one receiving slot (9, 83, 90, 95, 113) intended to receive the upper end or the lower end of a cover layer (7, 87, 98, 107, 112).

2. A device in accordance with Claim 1, characterized in that it has in addition a covering (40) for bottom steps (37) with rounded lateral ends and the visible front surface of the covering (40) is shaped to correspond to the profile part (6).

3. A device in accordance with Claim 1 or 2, characterized in that for the renovation of stairs with block steps or wedge steps (50, 58) it has attachment pieces which are to be secured to the front surfaces (51, 59) of the steps and have parts (53, 61) intended to create projecting step edges.

4. A device in accordance with Claim 1, 2 or 3, characterized in that for the renovation of stairs with block steps or wedge steps (65) it has boards which are to be secured onto the old treads (55) and are to form projecting step edges (66a).

5. A device in accordance with any one of Claims 1 to 4, characterized in that for the renovation of cantilever stairs without risers it has retaining blocks (77) which are to be secured to the underside of the old stairstep (76) and have a slot (79) arranged at right angles to the underside of the stairstep and the lower legs (80) of the profiles (74) are provided with a vertically protruding flange (75) insertable into the slot (79).

6. A device in accordance with any one of Claims 1 to 5, characterized in that the profile (84) has two receiving slots (83, 90) intended for the insertion of the upper end and the lower end of the cover layer (87).

7. A device in accordance with any one of Claims 1 to 6, characterized in that the cover layer (87, 98) has a slot (88, 99) on its rear and the profile part (85, 94) has on its front a spring (86, 96) which can be pressed into the slot.

8. A device in accordance with any one of Claims 1 to 7, characterized in that the cover layer (87, 98, 107) is preformed to correspond to the profile part (85, 94, 106).

9. A device in accordance with any one of Claims 1 to 7, characterized in that the profile part (94, 106) is arranged substantially plane but at an angle to the legs of the profile (93, 105) which deviates from 90 and is connected to the middle leg (103) by at least one additional reinforcing flange (104, 108).

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