US 2014/0196388 A1Published application

Lightweight wooden stairs

AssigneeFakro Pp Sp. Z O.O.

InventorsBogustaw Kasiñski, Bartlomiej Mos

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Abstract

The present disclosure provides a system of light weight folding stairs, especially lightweight wooden stairs, designed for installation in the ceiling of a building. For example, the light weight ladder-type stair system may be opened downwards and unfolded towards inside the room located under this ceiling. At least one ladder-type stair section is connected to a flap that fits within a frame in an opening in the ceiling, wherein the flap hinges open to access the folded stair sections. The ladder-type stair section is connected to the flap by a hook-type holder that allows installing the frame in a ceiling opening without the flap, which can be easily and quickly attached during final stage of assembly.

Claims20

Dependent claims

A folding stair system for installation in a ceiling, wherein the stair system folds down from an opening in a ceiling, the system comprising:

a flap configured to fit flush within a frame of the opening in the ceiling, wherein the flap is hingedly connected to the frame;
at least two ladder-type stair sections hingedly connected together, wherein the ladder-type stair sections convert between a folded position and a ladder position, wherein the folded position the ladder-type sections are foldably stacked upon one another, wherein the ladder position the ladder-type sections unfolded into a linear ladder;
a hook-type holder connecting a ladder-type stair section to the flap, wherein the hook-type holder includes:
a body including a base and a hook, wherein the base is in contact with the flap, wherein the base includes a protrusion defining a catch seat space between the base and the flap, wherein the hook extends above the base and curves over the base, wherein the hook includes a top surface and a bottom surface,
a latch extending from the top surface of the hook, wherein the latch includes an insert and a catch;
and
a cylindrical journal inserted into a journal seat space defined by the bottom surface of the hook, wherein the cylindrical journal is connected to a first end of a connecting member, wherein a second end of the connecting member is attached to a first end of a pull rod, wherein a second end of the pull rod is connected to the frame,
wherein the hook is configured to move between an open position and a closed position,
wherein, in the closed position, the insert is held in contact with a surface of the cylindrical journal when the catch is in the catch seat space and engaged with the protrusion of the base.

6 more elements

Folding stairs designed for installation in the ceiling of a building, opening downwards together with a flap designed for closing the opening in the building ceiling from the underside and unfolding into the room located under the ceiling, the folding stairs comprising:

a plurality of ladder-type stairs sections connected to each other by hinges located in individual joints of consecutive stairs sections at upper and lower ends of stringers of the consecutive stairs sections, the plurality of stairs sections including a first stairs section and a second stairs section;
wherein the first stairs section, which in an unfolded state, takes the highest position amongst all of the stair sections, is pivotally connected with a frame and an axis of rotation between the first stair section and the frame remains unchanged regardless of the position of the folding stairs;
wherein the second stairs section is connected to the first stair section by at least one high-axis hinge having an axis of rotation at an upper section of the stringers of both of the first stairs section and the second stairs section;
wherein the flap is suspended from the first stairs section by at least two pairs of connecting members that together with the first stairs section and the flap form a four-bar linkage;
and
the connecting members suspending the flap are connected with the flap by hook-type holders, each hook-type holder including a bearing seat engaging a journal seated in one of the connecting members on which the flap is suspended, wherein the mounting access to the bearing seat is closed by an insert including a surface complementing the bearing seat and fastened to the hook-type holder by a latch.

3 more elements

Dependencies are inferred from the claim text.