WO2023140764A1

WO2023140764A1 - Screed tool assembly for forming a precise slope towards a drainage outlet

Info

Publication number: WO2023140764A1
Application number: PCT/SE2022/051255
Authority: WO
Inventors: Per LÖFVING
Original assignee: Good Consulting I Uppsala Ab
Priority date: 2022-01-24
Filing date: 2022-12-30
Publication date: 2023-07-27
Also published as: SE2250064A1; SE545588C2

Abstract

The present invention relates to a screed tool assembly (100) for forming a slope towards a drainage outlet (180). The screed tool assembly (100) comprises rotating members (130, 140, 150) connected to a levelling plate (120), wherein the rotating members (130, 140, 150) are freely movable in the vertical direction. The levelling plate (120) is connected to a hub (110) and can be levelled relative to the hub(110). The hub (110) is, during use, placed in an inner chamber (183) of the drainage outlet (180).

Description

SCREED TOOL ASSEMBLY FOR FORMING A PRECISE SLOPE TOWARDS A DRAINAGE OUTLET

TECHNICAL FIELD

The present invention relates to a screed tool assembly for forming a slope in a levelling compound towards a drainage outlet. In particular, the invention relates to a screed tool assembly comprising a rotary part rotatory fixed to a center portion that during use is fixed to the drainage outlet and provided with a rotating arm with a screed blade that can be set to a predetermined angle.

BACKGROUND

Floors in rooms with a drainage outlet, such as a bathroom or a laundry, are during construction provided with a slope towards the drainage outlet in order for water to be efficiently led to the drainage outlet. This is of particular importance in, for example, in a bathroom with a shower, wherein a large flow of water must be handled. Typically, rules and regulations, not at least relating to insurance terms and conditions, are in place and stipulate a minimum slope angle towards the drainage outlet and typically also a radial distance of a sloped area surrounding the drainage outlet. Corresponding rule and regulations may apply also to other rooms or facilities wherein a large flow of water is handled, for example professional kitchens, cleaning rooms, medical and veterinarian facilities, industries, farms, slaughterhouses, etc.

The slope towards the drainage outlet is today typically formed by manual labor wherein a craftsman forms the slope in a bed of cement, mortar, floor levelling compound or the like. This is commonly considered as a work requiring a high level of skill and experience and even a skilled artisan may from time to time produce a result that does not fulfill the requirements. The nature of the materials is also such that only one chance is given to get it right, if the cement or even concrete harden in an incorrect configuration it will be a tremendous amount of work to have it removed and replaced. The removal of a layer of concrete may damage lower imbedded parts of the construction, such as heating pipes. In fact, errors in providing a correct slope and sloped area are common construction errors. Such errors may, if they go unnoticed, cause severe and costly water damages. If noticed, for example during construction inspections, the errors may be costly to fix and the extra work causes delays.

Simple tools, such as height markers, can be distributed in the area around the drainage outlet to provide the craftsman with an indication of the height/thickness of the floor levelling compound. Still these tools require a high level of skill in order to get the desired result.

Tools and devices that address the problems described above are known in the art: SE508611 C2 discloses a screed tool assembly that relies on a telescopic mast fixed to the ceiling above the drainage outlet in order to support a rotating screed arm and blade. The telescopic mast appears to hinder the craftsman to effectively work with the drainage outlet, especially given the limited space wherein a drainage outlet is often found, for example a bathroom.

AU2006236000A1 discloses a screed tool assembly with a rotating screed arm and blade. The results achieved with this screed tool assembly appear to be dependent on the drainage outlet has been carefully and correctly levelled, which is not always the case.

There is a need within this field for a screed tool assembly that is rigid enough and that can be securely fastened to the drainage outlet in order to provide the precision and repeatability that is required. Further there is a need for a screed tool assembly that is easy to use under the sometimes pressing situation that working with a quickly hardening floor levelling compound may imposes.

SUMMARY

The object of the present invention is to overcome the drawbacks associated with prior art screed tool assembly. This is achieved by the screed tool assembly defined by the independent claim.

An aspect of the invention of the invention relates to a screed tool assembly for forming a slope in a levelling compound towards a drainage outlet. The screed tool assembly will form a slope with a predetermined angle towards the drainage outlet, which has an inner chamber accessible from above and an upper surface being the uppermost part of the drainage outlet. The screed tool assembly comprises a hub arranged to be least partly inserted into the inner chamber of the drainage outlet and fixable to the inner chamber and a levelling plate connected to hub. The screed tool assembly also comprises a rotating center part joined to the levelling plate with a center rotational axis and arranged to rotate freely around the center rotational axis. The screed tool assembly further comprises a radial arm attached to the rotating center part and extending radially outwards and a blade attached to the radial arm and, during use, arranged to interact with the levelling compound. The rotating center part, the radial arm and the blade form rotating members of the screed tool assembly.

The screed tool assembly is arranged so that the rotating center part is freely movable in the vertical direction along the rotational axis. The screed tool assembly further comprises means for adjusting a position of the hub relative to the levelling plate and thereby the screed tool assembly may be adjusted to correct an incorrect levelling of the drainage outlet within a predetermined range. The screed tool assembly also comprises a contact zone positioned at an innermost part of the blade defining a single point of contact between the rotating members and the drainage outlet. The blade extends from the contact zone to its radially distant end, wherein, during use, the contact zone of the blade is arranged to abut the upper surface of the drainage outlet. The screed tool assembly additionally comprises angle adjusting means arranged to provide an angle between the rotating center part and at least the blade so that the angle of the blade with regard to a horizontal level may be adjusted so that the radially distant end of the blade can be elevated and fixed at a higher level than the contact zone. The angle is fixable for example by a click-stop arrangement or by providing tightening means.

According to one embodiment of the screed tool assembly, the blade is rigidly attached to the radial arm and the angle adjusting means are arranged to provide an angle between the radial arm and the rotating center part.

According to one embodiment of the screed tool assembly, the radial arm is rigidly attached to the rotating center part and the angle adjusting means are arranged to provide an angle between the radial arm and the blade.

According to one embodiment of the screed tool assembly, the means for adjusting the relative position of the hub relative to the levelling plate comprises at least three adjustment screws.

According to one embodiment of the screed tool assembly, the radial arm is extendable in the radial outward direction.

According to one embodiment, the screed tool assembly comprises a first hub and a second hub. The first hub is arranged to be at least partly accommodated by a drainage outlet of a first type and the second hub is arranged to be at least partly accommodated in a drainage outlet of a second type. The part of the first hub to be accommodated by a drainage outlet of the first type has a different cross-sectional shape than the part of the second hub to be accommodated by a drainage outlet of the second type.

According to one embodiment, the part of the first hub to be accommodated by a drainage outlet of the first type has a circular cross-sectional shape and the part of the second hub to be accommodated by a drainage outlet of the second type has a rectangular or quadratic shape. According to one embodiment, the screed tool assembly comprises a hub that is provided with a radial expander arranged to provide an expansion of a part of the hub in the radial direction outwards from a center portion of the hub. An outer part of the radial expander is arranged to, in an expanded position, press against inner walls of the inner chamber. The radial expander may comprise at least two rigid ring form parts, i.e., an upper ring formed part and a lower ring formed part, which are connected with pressing means arranged to press the upper and lower ring formed parts together, and a resilient ring provided inbetween the upper ring formed part and the lower ring formed part. The resilient ring is positioned so that it in a compressed state extends radially outwards from the periphery of the upper ring formed part and the periphery of the lower ring formed part.

Thanks to the invention the complicated work of forming a slope with a predetermined angle towards the drainage outlet is simplified. The invention makes it considerably easier to comply to rules and regulations and insurance requirements both when renovating existing facilities as well as in new constructions. The screed tool assembly saves time also for a skilled and experienced craftsman.

An advantage afforded by the present invention is that the angle of the slope, i.e., the slope angle, is easily reproducible.

An advantage afforded by embodiments of the present invention is that the slope angle can be set. Preset angles may be provided representing different requirements.

A further advantage of the screed tool assembly according to the present invention is the modular design allowing for the use of different types and sizes of blades and different types and sizes of hubs corresponding to different types and sizes of drainage outlets.

Many additional benefits and advantages of the present invention will be readily understood by the skilled person in view of the detailed description below and accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now be described in more detail with reference to the appended drawings, wherein

Figures 1 a-c schematically illustrate an embodiment of the screed tool assembly according to the invention in a) an elevated perspective view, b) an exploded perspective view and c) in a cross-sectional side view; Figure 2 schematically illustrates in a cross-sectional side view the screed tool assembly according to one embodiment of the invention;

Figure 3 schematically illustrates in a cross-sectional side view a detail of the hub of the screed tool assembly according to one embodiment of the invention;

Figure 4a-d schematically illustrate in elevated perspective views (upper panel) and front views (lower panel) different embodiments of the screed blade of the screed tool assembly according to one embodiment of the invention; and

Figure 5 schematically illustrates parts of the screed tool assembly according to one embodiment of the invention in an elevated perspective view.

All the figures are schematic, not necessarily to scale, and generally only show parts that are necessary in order to elucidate the respective embodiments, whereas other parts may be omitted or merely suggested. Any reference number appearing in multiple drawings refers to the same object or feature throughout the drawings, unless otherwise indicated.

DETAILED DESCRIPTION

Terms such as ’’top”, “bottom”, “upper”, “lower”, “below”, “above”, etc. are used merely with reference to the geometry of the embodiment of the invention shown in the drawings and/or during normal operation or mounting of the device/devices and are not intended to limit the invention in any manner.

The screed tool assembly is intended for use during the construction of a floor with a drainage outlet, or floor drain, and for ensuring a controlled slope towards the drainage outlet. Typically in such a construction, mortar, floor levelling compound, cement or even concrete is provided on the floor and after a resting time, wherein a desired texture of the material is achieved, a sloped area with a defined slope angle towards the drainage outlet is formed. The term “levelling compound” is hereinafter used to encompass all materials commonly used for this purpose, such as floor levelling compound, fiber reinforced floor leveling compound, bedding concrete, surface mortar, mortar, cement, concrete and plaster. A drainage outlet can be provided in many ways. Most commonly a prefabricated floor drain is used and mounted in connection with a floor pipe. Floor drains are typically standardized products but the design may differ, not at least in different countries and regions due to both tradition and regulations. A floor drain may comprise several different parts, such as a separate detachable water trap and a grater and may also be provided with one or more risers or slabs to bring the floor drain to a specific height. The term “drainage outlet” is used hereinafter to encompass all types of floor drains and various sizes. One common type of drainage outlet has a general cylindrical shape, seen from above a circular shape, and can be described as a traditional drainage outlet, which still dominates the market. Another type of drainage outlet has a general rectangular shape, for example quadratic. The drainage outlet has a hollow inner chamber that typically follows the general shape of the drainage outlet, for example cylindrical in the case of the traditional drainage outlet. The drainage outlet has an upper surface that may be formed by the upper end-surface of a pipelike member alone, in the case of a traditional drainage outlet, but most commonly extends a distance, typically a few centimeters, in the radial direction out from the inner chamber, forming a radial flange. With the elongated drainage outlet the flange extends from the sides in an outward direction. The upper surface of the drainage outlet provides the position for the intersection with the levelling compound and a smooth transition from the hardened compound to an inner part of the upper surface is one of the requirements for the final construction. In particular, no part of the drainage outlet should be above the lowest level of the levelling compound.

The screed tool assembly 100 according to the invention is schematically illustrated in Figures 1 a-c, wherein a) is an elevated perspective view, b) an exploded perspective view and c) an intersectional side view. The screed tool assembly 100 comprises a hub 110 arranged to be at least partly inserted into the inner chamber 183, also referred to as internal chamber 183, of the drainage outlet 180, preferably in a tight fit arrangement or fixable by other means so that the hub 110 is prevented from moving within the inner chamber 183 during use of the screed tool assembly 100. Tight fit and fixable should be understood that such motion is prevented, but should be possible for an operator to remove the hub 110 from the outlet drainage 180 with normal muscular force. The hub 110 is connected to a levelling plate 120 with means for adjusting the relative position between the hub 110 and the levelling plate 120. The adjusting means preferably comprises three adjustment screws 122 arranged to adjust the relative position between the hub 110 and the levelling plate 120 and to securely fixate them at the desired position. This allows the levelling plate 120 to be accurately levelled even if the drainage outlet 110 deviates somewhat from being perfectly leveled, which is not uncommon. To aid the levelling, the levelling plate 120 may be provided with one or more levels 128, for example spirit levels. The screed tool assembly 100 further comprises a rotating center part 130, which is joined to the levelling plate 120 with a center rotational axis 125 and arranged to rotate freely around the center rotational axis 125. The center rotational axis 125 may be provided as a separate member or alternatively as an integrated part of the levelling plate 120 or as an integrated part of the rotating center part 130. Preferably, the center rotational axis 125 is a separate member resting in a hole 121 in the levelling plate 120 and extending into a hole 131 in the rotating center part 130. The center rotational axis 125 and the corresponding holes 121 , 131 should be arranged with a narrow tolerance so that there is no play with regard to the angle between the levelling plate 120 and the rotating center part 130. Hence, if the levelling plate 120 is correctly levelled, also the rotating center part 130 will be correctly levelled. As illustrated in Figure 1 c, the levelling plate 120 plate may have a center portion 123 that extends downward into a center opening 113 of the hub 110. This extended center portion 123 provides, even if the major part of the levelling plate 120 is relatively thin, a long contact area between the levelling plate 120 and the center rotational axis 125 and secures a rigid structure. The rotating center part 130 is arranged to be freely movable in the vertical direction along the center rotational axis 125, at least within a predefined distance. The distance of free motion in between the levelling plate 120 and the center rotational axis 125 in the vertical direction should be at least 0-5 cm. During normal operation of the screed tool assembly 100, the surface of the rotating center part 130 facing the upper surface of the levelling plate 120 should preferably not be in contact with the levelling plate 120, i.e., during operation the connection of the rotating center part 130 to the stationary parts, the levelling plate 120 and the hub 110, should preferably be via the center rotational axis 125 only.

A radial arm 140 is provided in connection with the rotating center part 130, either as a separate member or an integral part of the rotating center part 130. Attached to the radial arm 140 is a blade 150. The blade 150 is preferably detachably fixed to the radial arm 140 so that it can be replaced since it is typically subjected to wear and/or damage. According to the embodiment depicted in figures 1 a-c the blade 150 is rigidly attached to the radial arm 140 although detachable through provided fastening means. The blade fastening means can, for example, be bults extending into the radial arm 140 or the radial arm 140 may be provided with threaded pins 141 extending through holes 158 in the blade 150, which is secured with nuts 153.

The rotating members or parts 130, 140, 150 are provided with angle adjustment means so that the angle of the blade 150 with regard to the horizontal level may be adjusted so that a radially distant end 152 of the blade 150 can be elevated and fixed at a higher level than a contact zone 151 , see further below. According to the embodiment illustrated in Figures 1 a-c, the radial arm 140 is a separate member from the rotating center part 130 and pivotally joined to the rotating center part 130. A pivot joint may be formed by a pin or screw 127 extending through both the radial arm 140 and the rotating center part 130, preferably in a section 140a of the radial arm 140 extending into the rotating center part 130. Angle adjustment means 126 may be provided on the rotating center part 130 and acting on the radial arm 140 to set a desired angle. Angle adjustment means 126 may be provided as an adjustment screw 126 in threaded engagement with the rotating center part 130 and acting on the portion of the radial arm 140 at a position radially inwards from the pivot joint 127. As appreciated by the skilled person a variety of other ways of arranging a fixable angle adjustment exists and can be utilized.

According to one embodiment of the invention, schematically illustrated in a side view according to Figure 2, the radial arm 140 is a fixed extension or integral part of the rotating center part 130, wherein fixed means fixed in the vertical direction. In order to provide for the angle adjustment of the blade 150, the radial arm 140 is provided with means to adjust the angle in-between these parts, for example a hinge joint 153 positioned at the outermost part of the radial arm 140 and an adjustment screw 154 positioned radially inwards from the hinged joint 153 and preferably at the contact zone 151 of the blade 150. A suitable range of the angle adjustment is 1 :200-1 :25. The slope angle may be regulated in certain countries and regions and the angle adjustment means may be provided with clear markings, click stops or the like to make it easy to select one, or a few, preferred angles.

The rotating center part 130, the radial arm 140 and the blade 150 form the main rotating members of the screed tool assembly 100 and the hub 110 and the levelling plate 120 form the main stationary members. The blade 150 is provided with a contact zone 151 positioned at the innermost part of the blade 150 and defines a contact point of the rotating members with the drainage outlet 180, typically with the upper surface 185. The contacting zone 151 may be point-like i.e., the corner of the elongated edge of the blade 150 and the short side facing the levelling plate 120. Alternatively, the corner may be rounded or beveled resulting in a contact zone 151 that extends a short distance in the radial direction. The contact zone 151 may, for example, extend a few millimeters and up to about a centimeter. The contact zone 151 provides, during use, a single point of contact between the rotating members and the drainage outlet 180. The upper surface 185 may be provided on a radially outwards extending flange 184 of the drainage outlet 180. Thereby, the contact zone 151 of the blade 150, also during use, governs the distances between the levelling plate 120 and the rotating center part 130 and since the rotating center part 130 is freely movable in the vertical direction an automatic height adjustment of the rotating members is achieved. In the case of a blade 150 with two or more edges, which will be further described below, and the edges extending an equal distance downwards, the contacting zone 151 will be split between the edges. However, with regard to defining the vertical position of the rotating members of the screed tool assembly 100 a single point of contact with the drainage outlet 180 is provided also in this case.

According to one embodiment, schematically illustrated in Figures 1 a-c and 2, the radial arm 140 is extendable in the radial outward direction. The extension may be provided by a first part 140a of the radial arm 140 being insertable and slidable into a second part 140b of the radial arm 140. Position locking means may be provided, for example by a locking screw arrangement 142. The locking screw arrangement 142 may comprise a handle 142a fixed to a bult 142b, the bult 142b being arranged to extend through holes in the first 140a and the second part 140b of the radial arm 140 of which one hole is an elongated cut-out 140c and the other a circular hole 140d with a diameter slightly larger than the bult 142b. An elongated plate 142c with a threaded hole to engage with the bult 142b with dimensions that matches the interior of the first part 140a of the radial arm 140 may be provided. Other type of locking means, for example a click lock arrangement may be envisaged. According to this embodiment the blade 150 is preferably attached only to the outer part 140b of the radial arm 140 so that outer part 140b of the radial arm 140 is easily adjusted. Alternatively, blades 150 of different length may be provided and the blade 150 is exchanged if the length of the radial arm 140 requires adjustment. The open end portions of the screed tool assembly 100 may be provided with covers or lids 102 that protects the interior of the tool from levelling compound, for example.

It is important that the hub 110 provides a tight fit to inner chamber 183 of the drainage outlet 180. According to one embodiment of the invention, the screed tool assembly 100 can be provided with exchangeable hubs 110, wherein each hub 110 is designed to correspond to a specific drainage outlet 180 or a specific range of drainage outlets 180. A dedicated hub 110 may take advantage of a specific design of a drainage outlet 180, for example using ridges, or outer protruding parts that are provided in the inner chamber 183 to support internal parts, such as a water lock, to increase the stability. Additionally, the hub 110 can be provided in other shapes than the depicted cylindrical, for example a shape with a quadratic or rectangular cross-section to fit to drainage outlets 180 of corresponding shape. The modular design of the screed tool assembly 100 according to the invention makes it easy to provide different hubs 140 and for the craftsman to exchange hubs.

According to one embodiment, schematically illustrated in the cross-sectional view of a hub 310 in Figure 3, the hub 310 is provided with fastening means provided to secure the hub 310 in the inner chamber of the drainage outlet. According to one embodiment the fastening means is a radial expander, providing an expansion in the radial direction outwards from a center portion of the hub 310 and the outer part of the radial expander arranged to, during the expansion, to press against the walls of the inner chamber and wherein that pressure is maintained during the use of the screed tool assembly 100. A radial expander may be provided in that the hub 310 comprises of two rigid ring form parts, an upper ring formed part 380:1 and a lower ring formed part 380:2, which are connected with pressing means, for example at least three screws 380:3 that can press the upper and lower ring formed parts together. Provided in-between the upper ring formed part 380:1 and a lower ring formed part 380:2 is a resilient ring 380:4, for example an O-ring of regular type. The resilient ring 380:4 is arranged such that upon the upper ring formed part 380:1 and a lower ring formed part 380:2 being pressed towards each other parts of the resilient ring 380:4 expands in the radial direction out of the cylindrical periphery of the hub 310. The resilient ring 380:4 is dimensioned and positioned close to the periphery of the upper ring formed part 380:1 and the periphery of the lower ring formed part 380:2 so that it in the compressed state, the resilient ring 380:4 extends radially outwards from the periphery of the upper ring formed part 380:1 and the periphery of the lower ring formed part 380:2. Thereby the hub 310 can be securely fixed in the inner chamber. The screws 380:3 may preferably be positioned under through openings in the levelling plate 120 so that the screws 380:3 are easily accessible from above. Other suitable types of radially expanding means would be known to the skilled person and also preferably being made accessible from above the levelling plate 120.

The radial arm 140 may have a length of 30-70 cm and the blade 150 may have a length of 20-60 cm. The materials found in the screed tool assembly 100 according to the invention are materials typically utilized in tools, such as steel, stainless steel, aluminum, and polymers. The blade 150 is preferably made of a hardened and wear resistant steel.

According to one embodiment, the blade 150 is a screed blade 450, as schematically illustrated in the view from the front in Figure 4a, which is a double blade with a leading edge 455 and a trailing edge 456. During use the leading edge 455 performs the screeding, or scraping, action and the trailing edge 456 provides support on the surface of the floor levelling material. This design enables using the screed tool assembly 100 in both rotational directions.

According to one embodiment, schematically illustrated in the view from the front in Figure 4b, the blade 150 is a smoothing blade 460, typically having a single edge 461 adapted to meet the surface of the levelling compound with a negative angle. Further alternative embodiments includes the blade 150 being provided as a rasp 470, figure 4c, or a diamond or carbide file 480, figure 4d, provided on one or both of the edges adapted to meet the surface of the levelling compound. The rasp 470 and carbide file 480 may preferably be used if adjustments of the slope is required and the levelling compound has dried or semi- hardened so that the floor may be treaded upon, but not having burned or hardened completely. Such blades 150 may preferably be provided with a contact zone 151 being the innermost portion of the blade 150 with a smooth surface in order to not damage the upper surface 185 of the drainage outlet 180.

According to one embodiment of the invention there is provided a screed tool assembly 500, schematically illustrated in Figure 5 with a hub 510 adapted to be used with a drainage outlet having a non-circular shape as seen from above, for example a rectangular or quadratic shape, with an inner chamber which have a corresponding inner shape. Also such a non-circular hub, for example a rectangular hub 510, may be provided with the fastening means described in relation to Figure 3, with modifications that would be obvious for the skilled person. The modular design of the screed tool assembly 100 according to the invention makes it easy to provide a plurality of hubs 110, 310, 510 that are adapted to be accommodated and securely fit into inner chambers of various shape and size. The above-described fastening means provided to secure the hub 110, 310, 510 in the inner chamber may easily be adapted to function also with other shapes than the described cylindrical hub. According to one embodiment the screed tool assembly 100 is provided with at least two hubs 110, 310, 510 of different size or shape.

An aspect of the invention relates to a screed tool assembly 100 for forming a slope in a levelling compound. The slope has a predetermined angle towards a drainage outlet 180 comprising an inner chamber 183 accessible from above and an upper surface 185 being the uppermost part of the drainage outlet 180. The screed tool assembly 100 comprises a hub 110 arranged to be least partly inserted into the inner chamber 183 of the drainage outlet 180 and fixable to the inner chamber 183 and a levelling plate 120 connected to hub 110. The screed tool assembly 100 also comprises a rotating center part 130 joined to the levelling plate 120 with a center rotational axis 125 and arranged to rotate freely around the center rotational axis 125. The screed tool assembly 100 further comprises a radial arm 140 attached to the rotating center part 130 and extending radially outwards and a blade 150 attached to the radial arm 140 and, during use, arranged to interact with the levelling compound. The rotating center part 130, the radial arm 140 and the blade 150 form rotating members of the screed tool assembly 100. The screed tool assembly 100 additionally comprises means 122 for adjusting a position of the hub 110 relative to the levelling plate 120 and thereby the screed tool assembly 100 may be adjusted to correct an incorrect levelling of the drainage outlet 110 within a predetermined range. The rotating center part 130 is freely movable in the vertical direction along the rotational axis 125. A contact zone 151 is positioned at the innermost part of the blade 150 and defines a single point of contact between the rotating members and the drainage outlet 180. The blade 150 extends from the contact zone 151 to its radially distant end 152.The contact zone 151 of the blade 150 is, during use, arranged to abut the upper surface 185 of the drainage outlet 180. The screed tool assembly 100 also comprises angle adjusting means 126, 153, 154 arranged to provide an angle between the rotating center part 130 and at least the blade 150 so that the angle of the blade 150 with regard to a horizontal level may be adjusted so that the radially distant end 152 of the blade 150 can be elevated and fixed at a higher level than the contact zone 151 . According to the invention, the angle is fixable.

In an embodiment, the blade 150 is rigidly attached to the radial arm 140 and the angle adjusting means 126 are arranged to provide an angle between the radial arm 140 and the rotating center part 130.

In an embodiment, the radial arm 140 is rigidly attached to rotating center part 130 and the angle adjusting means 153, 154 are arranged to provide an angle between the radial arm 140 and the blade 150.

In an embodiment, the means 122 for adjusting the relative position of the hub 110 relative the levelling plate 120 comprises at least three adjustment screws 122.

In an embodiment, the screed tool assembly 100 comprises at least a first hub 110 and a second hub 510. The first hub 110 is arranged to be at least partly accommodated by a drainage outlet 180 of a first type and the second hub 510 is arranged to be at least partly accommodated in a drainage outlet 180 of a second type. The part of the first hub 110 to be accommodated by the drainage outlet 180 of the first type has a different cross-sectional shape than the part of the second hub 510 to be accommodated by the drainage outlet 180 of the second type.

In a particular embodiment, the part of the first hub 110 to be accommodated by the drainage outlet 180 of the first type has a circular cross-sectional shape and the part of the second hub 510 to be accommodated by the drainage outlet 180 of the second type has a rectangular or quadratic shape.

In an embodiment, the hub 310 is provided with a radial expander arranged to provide an expansion of a part of the hub 310 in the radial direction outwards from a center portion of the hub 310. An outer part of the radial expander is arranged to, in an expanded position, press against inner walls of the inner chamber 183.

In a particular embodiment, the radial expander comprises at least two rigid ring form parts, an upper ring formed part 380:1 and a lower ring formed part 380:2. These ring formed parts 380: 1 , 380:2 are connected with pressing means 380:3 arranged to press the upper and lower ring formed parts 380: 1 , 380:2 together. The radial expander also comprises a resilient ring 380:4 provided in-between the upper ring formed part 380:1 and the lower ring formed part 380:2. The resilient ring 380:4 is positioned so that it in a compressed state extends radially outwards from the periphery of the upper ring formed part 380:1 and the periphery of the lower ring formed part 380:2.

In an embodiment, the radial arm 140 is extendable in the radial outward direction.

The embodiments described above are to be understood as illustrative examples of the system and method of the present invention. It will be understood that those skilled in the art that various modifications, combinations and changes may be made to the embodiments. In particular, different part solutions in the different embodiments can be combined in other configurations, where technically possible.

Claims

1. A screed tool assembly (100) for forming a slope in a levelling compound, the slope having a predetermined angle towards a drainage outlet (180) comprising an inner chamber (183) accessible from above and an upper surface (185) being the uppermost part of the drainage outlet (180), the screed tool assembly (100) comprising: a hub (110) arranged to be least partly inserted into the inner chamber (183) of the drainage outlet (180) and fixable to the inner chamber (183); a levelling plate (120) connected to hub (110); a rotating center part (130) joined to the levelling plate (120) with a center rotational axis (125) and arranged to rotate freely around the center rotational axis (125); a radial arm (140) attached to the rotating center part (130) and extending radially outwards; and a blade (150) attached to the radial arm (140) and, during use, arranged to interact with the levelling compound, the rotating center part (130), the radial arm (140) and the blade (150) forming rotating members of the screed tool assembly (100), the screed tool assembly (100) is characterized by: means (122) for adjusting a position of the hub (110) relative to the levelling plate (120) and thereby the screed tool assembly (100) may be adjusted to correct an incorrect levelling of the drainage outlet (110) within a predetermined range, and in that the rotating center part (130) is freely movable in the vertical direction along the rotational axis (125); a contact zone (151) positioned at the innermost part of the blade (150) defining a single point of contact between the rotating members and the drainage outlet (180), the blade (150) extending from the contact zone (151) to its radially distant end (152), wherein during use the contact zone (151) of the blade (150) is arranged to abut the upper surface (185) of the drainage outlet (180); and angle adjusting means (126, 153, 154) arranged to provide an angle between the rotating center part (130) and at least the blade (150), so that the angle of the blade (150) with regard to a horizontal level may be adjusted so that the radially distant end (152) of the blade (150) can be elevated and fixed at a higher level than the contact zone (151), the angle being fixable.

2. The screed tool assembly (100) according to claim 1 , wherein the blade (150) is rigidly attached to the radial arm (140) and the angle adjusting means (126) are arranged to provide an angle between the radial arm (140) and the rotating center part (130).

3. The screed tool assembly (100) according to claim 1 , wherein the radial arm (140) is rigidly attached to rotating center part (130) and the angle adjusting means (153, 154) are arranged to provide an angle between the radial arm (140) and the blade (150).

4. The screed tool assembly (100) according to any of the preceding claims, wherein the means (122) for adjusting the relative position of the hub (110) relative the levelling plate (120) comprises at least three adjustment screws (122).

5. The screed tool assembly (100) according to any of the preceding claims, further comprising at least a first hub (110) and a second hub (510), wherein the first hub (110) is arranged to be at least partly accommodated by a drainage outlet (180) of a first type and the second hub (510) is arranged to be at least partly accommodated in a drainage outlet (180) of a second type, the part of the first hub (110) to be accommodated by a drainage outlet (180) of the first type having a different cross-sectional shape than the part of the second hub (510) to be accommodated by a drainage outlet (180) of the second type.

6. The screed tool assembly (100) according to claim 5, wherein the part of the first hub (110) to be accommodated by a drainage outlet (180) of the first type has a circular cross-sectional shape and the part of the second hub (510) to be accommodated by a drainage outlet (180) of the second type has a rectangular or quadratic shape.

7. The screed tool assembly (100) according to any of the preceding claims, wherein the hub (310) is provided with a radial expander arranged to provide an expansion of a part of the hub (310) in the radial direction outwards from a center portion of the hub (310) and an outer part of the radial expander being arranged to, in an expanded position, press against inner walls of the inner chamber (183).

8. The screed tool assembly (100) according to claim 7, wherein the radial expander comprises at least two rigid ring form parts, an upper ring formed part (380:1) and a lower ring formed part (380:2), which are connected with pressing means (380:3) arranged to press the upper and lower ring formed parts (380:1, 380:2) together, and a resilient ring (380:4) provided in-between the upper ring formed part (380:1) and the lower ring formed part (380:2), the resilient ring (380:4) positioned so that it in an compressed state extends radially outwards from the periphery of the upper ring formed part (380:1) and the periphery of the lower ring formed part (380:2).

9. The screed tool assembly (100) according to any of the preceding claims, wherein the radial arm (140) is extendable in the radial outward direction.