, This invention relates to a device for winding staircases, where step elements are designed with a width

; diverging from an inner end and intended for anchoring to a column or similar supporting structure, as described in the 5 introduction to patent claim 1.

Bakgrunn

Upon building winding staircases which may be constructed with an evenly rounded shape, uniform step

10 elements may be used. This significantly simplifies manufacturing, stock management and assembly. Upon building staircases which are to follow straight wall sections or in otherwise manner have an outer angle, various step elements will be required.

15 A step element is known from German document laid open to public inspection 2.004.255 which may be used for st ingless staircases, but the outer end is here limited to a special edge- pattern and may not be adapted to i.e. corners. The practical result is that upon building

20 straight, angular staircases, an exact adaptation of the individual elements must be carried out at the building site. This is impractical in view of the mountingas well as because the step elements must be manufactured in oversized proportions, creating unnecessary cutting.

25

Object

The main object of the invention is to produce a set of step elements which make it possible to manufacture angled winding staircases, requiring a small number of standardized

30 elements. It is particularly an object to create a set of f step elements which are simple to produce and which require reduced storage space and may be used for building staircases without necessitating excessive cutting. Furthermore it is an object to arrive at a string element

35 with no need for banister list, which may be appropriately used together with a step element, in this manner to create

a staircase concept which is simpler than known staircases.

The invention

The main object may be achieved by contructing the step elements as shown in the characterizing portion of patent claim 1.

With said set of step elements, the buiding of said stair type will be made significantly simpler than before. In practice, different staircases with straight outer edges at a right angle to each other may be built with two elements, if desired with one simple additional element and simple adaptation.

Further advantageous features of the invention are described in patent claim 2 and 5.

Example

The invention is described below in further detail with reference to the drawings, where fig. IA and IB show plan sketch of step element as claimed in the invention, whereas fig. 2 shows a perspective sketch of an example of a string element with integrated hand railing.

Fig. IA shows a step element 11 which consists of a series of glued lamellas 12. The element 11 is further glued around a centre line 13 consisting of two parts, each with a sharpening of the lamelas of 11.25° in relation to this centre line. The two parts, 11A and 11B are cut out from a rectangular section with a diagonal cut, so that after gluing the one part is turned over the opposite way, compared to the other. Among other things, this makes it possible for the step element to be used both ways, depending on whether it is being employed for the building of a staircase with a right or a left winding. At the narrow end 14, the element 11 is tapered at a right angle to the centre line 13, whereas the wide end 15 ends at a right angle to the shorter long side 16 of the element.

The step element in fig. IB differs from the step element in fig. IA only as its shortest long side 18 is just as long as the longest long side 17 of the element in fig. IA. Further, the widest end 19 touches the element's longest long side 20 at an angle of 45°.

These elements may be used together for the building of a winding staircase. At the narrow end toward the inner edge of the staircase, they may be fastened to a column by suitable fittings or by being milled into a central core. This may be varied or combined by the use of vertical hand railing supports as described below.

The step elements may be fastened by their outer, wider end in different known ways, i.e. by fastening to wall. In fig. 3 is shown a string element 21 which particularly advantageously may be used for the building of an outer hand rail or bannister. In the given example string element 21 is constructed as a frame of gluelan with two parallell sides 22A and 22B which are intended to be erected vertically, and evenly joined at the ends with each their own slanted and mutually parallell elements 23A and 23B, thus creating a closed frame. The elements 23A and 23B at the ends create an angle with the side rods 22A and 22B which generally correspond to the staircase's angle of climb. The material involved is gluelan. The basic structure of this element corresponds to the element from German Publication No. 3.637.807, but is further developed .

String element 21 is supplied with rounded corners, particularly at the upper edge, as shown at 24 and 25. The significance of this will be made obvious through the description below. Further the string element 21 is provided with an upper, internal lateral piece 26 in the upper region , and a lower laterial 27 in the lower half. These are connected centrally by a vertical rod 28.

Upon building a staircase with this element, several equal string elements 21 are fastened in step fashion behind one another with adequate fastening elements through the side pieces 22A and 22B. The lower lateral piece 27 of each

string element may through a suitable fitting serve as a clamp for a step element as described above.

String element 21 may be designed in differend widths, adapted to the width of the step elements and at a height which provides adequate height to the upper grip element 23A. In the case of staircase standing freely, not against a wall, the outer edge of the step elements and/or string elements are anchored in a suitable way, i.e. to a nearby wall.