Solution refers to a loft stairs comprising a coplanar infill that makes the loft stairs frame being in one plane with the surface of the loft stairs flap, the infill being a finishing element for installation of the stairs in the ceiling, covering the space between the loft stairs frame and the ceiling wall.

There is known solution from WO2007091171 A1 application which refers to doors, windows or lightings, where the sash features profiles that form a frame around the door, window or lighting frame. Profiles have one arm with its surface on the same plane as the surface of the wall in which the door or window is mounted.

There is also known solution from polish patent application P.402367 which refers to integrated door frame for internal or external doors, whose middle section forming the door frame is made of wood, plywood, wood-based panels, metal or plastic. The outer side of the door frame, parallel to the plane of the door's opening in the wall, has at least one profile element on the door leaf side and/or a profile element on the opposite side of the door leaf, this being made of metal or plastic and additionally connecting the door frame to the wall surrounding the door opening, on one or both sides in the plane of the wall.

There is known another solution from US3855746 B1 patent, presenting a profile that covers the junction of two structural elements mounted perpendicular to each other. This covering profile has two pockets in which the ends of the two elements are attached, and the outer wall of the profile covers the place where they are joined.

The field of the invention is a loft stairs comprising a standard frame, an extendable ladder or a scissor ladder mounted in it, a flap closing the frame, and a coplanar infill that makes the frame being in one plane with the surface of the ceiling.

The loft stairs are installed in a ceiling opening, where said opening dimensions coresponds to dimensions of the loft stairs frame, while maintaining free play clearances for convenient installation of said stairs. The loft stairs frame comprises four members, which are joined together in preferably rectangular frame which is closed from the inside of the building by means of a flap. The loft stairs copmprises also at least two extendable ladder segments which are embedded on the closing flap of the stairs, and which are movable relative to other segments or extendable ladder is a scissor ladder. The ladder segments and the scissor ladder are connected to the frame by means of a hinges.

The flap may be attached directly to the frame member by hinge connection, which allow for pivotal movement of the flap in respect to said frame member or the flap may be attached only to the first ladder segment, where the latter is directly attached to the frame member by mentioned above hinges. In the loft stairs installed state, its frame is embeded deeper in the ceiling than the closing flap, such that in the area of that difference in the depth of their embeding, a coplanar infill is located. Said coplanar infill makes that the frame is placed in one plane with the surface of the ceiling, where said ceiling may be made of a plaster and plasterboard, covering the aforementioned free play clearances.

The coplanar infills are a covering strips, made particularly of aluminium, but possibly also of any other material. During assembly of the stairs, the coplanar infill is mounted around frame of the stairs or the coplanar infill forms an integral element with the loft stairs frame when the stairs are delivered to the customer.

Said covering strips comprises an embedding section whose extension is an attachment arm basically parallel to the surface of the ceiling. In the assembled state, the embedding section is located in the area constituting the difference in the depth of the loft stairs frame and the closing flap in the ceiling. An inner surface of the embedding section is directed towards the frame while its outer surface lies under the plaster layer or another layer covering the ceiling.

The attachement arm of the covering strip is an extension of the outer surface of the embedding section and serves as an element attaching the covering strip in the ceiling, while additionally the attachment arm is fixed to the ceiling by means of a screw. The arm is located under the outer surface of the ceiling covering, e.g. plaster, or is embedded under the thermal insulation layer of the ceiling, e.g. the plasterboard layer. The covering strips are attached around the four frame members of the frame to form a closed frame around the stairs.

The covering strip, being an integral part of the loft stairs frame, comprises an embedding section with an adhering arm, through which the strips are attached to the frame members already in a delivered to the customer loft stairs state. An alternative to the adhering arm are two adhering arms that form a pocket for the frame members. The width of the covering strips pocket is defined as the distance between the inner walls of the two adhering arms of the pocket and is equal at least to the width of the end section of each frame member that fits into that pocket. The embedding section has an outer surface lying under the plaster layer of the ceiling or another layer covering the ceiling. The extension of the inner surface is an attachment arm basically parallel to the surface of the ceiling, which is also attached under the plaster layer of the ceiling or another layer covering the ceiling.

Each of the aforementioned covering strips comprising any dimensions and shape that match the stairs that it is to be used with.

The advantage of this solution is new loft stairs provided with an coplanar infill in the form of the covering strips for the gap between the depth of the frame and the closing flap, covering the junction of the frame with the edge of the ceiling, lending the stairs an aesthetic appearance as seen from the room in which they are installed.

The solution is disclosed also in the following drawings:

• Fig. 1 view of the closed loft stairs as seen from the room
• Fig. 2 section of the covering strip according to the first embodiment
• Fig. 3 cross section of loft stairs fitted with the covering strips according to the first embodiment
• Fig. 4 cross section of stairs fitted with the covering strips according to the first embodiment
• Figure 5 cross section of stairs fitted with the covering strips according to the second embodiment
• Fig. 6 cross section of stairs fitted with the covering strips according to the third embodiment

Loft stairs comprising a frame 1 closed from the outside by a flap 2, a coplanar infill that comes flush with the surface of a ceiling 4 and covers the space between the the frame 1 and the ceiling wall. The stairs also have folding ladder segments or scissor ladder not shown in the drawings. The infill is in the form of covering strips 3 featuring an embedding section 3' and an attachment arm 3". In the installed state, as shown in Fig. 3 and Fig. 4, the attachment arm 3" is located under the plaster board layer and is attached to the ceiling wall by means of a screw 7. Preferably, the frame 1 abuts on the inner surface 3.1' of the embedding section 3'. However, the embedding section may be at a distance from the base of the frame as shown in Fig. 4. The outer surface 3.2' of the embedding section 3' is located under the surface of the ceiling 4, e.g. under plaster. The covering strips forms a closed frame surrounding the stairs.

Loft stairs comprising a frame 1 closed from the outside by the flap 2, a coplanar infill that comes flush with the surface of the ceiling 4. The stairs also have folding ladder segments or a scissor ladder, not shown in the drawings. The infill is in the form of a covering strips 5 integral with the frame 1, the former featuring an embedding section 5' and an attachment arm 5". In the installed state, as shown in Fig. 5, the attachment arm 5" is located under the plaster board layer and is attached to the ceiling wall by means of a screw 7. Preferably, the frame 1 abuts on the embedding section 5'; however, also possible is an option wherein the door frame box is at a distance from the embedding section. The integral covering strip 5 comprises an arm 5'" adjacent to the frame member of the frame 1 in addition to being connected to the frame by means of fasteners preferably in the form of screws 6. From the outside, the embedding section is covered with a plaster layer.

The integral covering strips also forms a closed frame surrounding the stairs mounted in the ceiling.

The third embodiment disclose the stairs together with the integral covering strips as in the second embodiment, whereas the covering strips comprises a double adhering arm 5"', forming a pocket for the frame members.