Static structures (e.g. – buildings) – Facer held by stiffener-type frame – Back-to-back facers spaced by concealed framing
Patent
1993-10-29
1994-11-08
Friedman, Carl D.
Static structures (e.g., buildings)
Facer held by stiffener-type frame
Back-to-back facers spaced by concealed framing
52664, E04B 900
Patent
active
053615530
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a joist adapted to be used as a top joist in a sporting floor in which a plurality of floor boards or panels rest on a plurality of parallel top joists which are spaced apart and rest on a plurality of parallel, spaced-apart bottom joists extending substantially perpendicular to the top joists and supported on a base by means of blocks.
In a prior art sporting floor of the type described above, rubber inserts are arranged between the top and bottom joists. These rubber inserts give the sporting floor the required qualities of deformation or resilience, which renders it possible to make the bottom joists more rigid and, thus, so strong that sufficient strength is imparted to the sporting floor. One problem of this prior art sporting floor is the aging of the rubber material of the inserts, which thus can become rigid or brittle, thereby losing its elastic properties.
An object of the present invention therefore is to provide a joist adapted to be used as a top joist in a sporting floor of the type described above and designed in such a manner that the sporting floor can be given both the required qualities of deformation or resilience and the required strength properties, without necessitating the use of rubber inserts.
This object is achieved by a joist which is of the type described by way of introduction and, according to the present invention, is characterised in that it has a narrow, upper flat surface extending along the joist and adapted to engage the lower side of the floor boards or panels, and a narrow, lower flat surface which extends along the joist and which is positioned directly opposite the upper flat surface and adapted to engage the upper side of the bottom joists, and that it further has a thickness which decreases laterally outwards from these two flat surfaces.
In a preferred embodiment, the joist is flat-bevelled on both sides of the upper and/or lower flat surface. The ratio of joist thickness to width preferably is 1:4-1:5.
The invention will now be described in more detail with reference to the accompanying drawings.
FIG. 1 is a top plan view and illustrates a sporting floor in which the joist according to the present invention is used as a top joist, and
FIG. 2 is a sectional view along the line II--II in FIG. 1.
The floor illustrated in FIG. 1 comprises a plurality of parallel floor boards 1, such as parquet boards, forming the floor surface 2. The floor boards 1 rest on a plurality of parallel top joists 3 equidistantly spaced from each other and extending perpendicular to the floor boards 1. The floor boards 1 are attached to the top joists 3 by means of glue or nails.
The top joists 3 rest on a plurality of parallel bottom joists 4 which are equidistantly spaced from each other and extend perpendicular to the top joists 3, i.e. in parallel with the floor boards 1. The top joists 3 are nailed to the bottom joists 4.
The bottom joists 4 are supported on a base 5 (see FIG. 2), such as a concrete floor, by means of blocks 6 which are equidistantly spaced from each other. The center distance between the blocks 6 along the bottom joists 4 is the same as the center distance between the top joists 3, and the blocks 6 are positioned midway between neighbouring top joists 3.
In the embodiment shown in FIG. 1, each top joist 3 is composed of a plurality of joist elements 3a of the same length which are arranged successively and whose length is equal to the center distance between neighbouring bottom joists 4. Each joist element 3a extends between and rests on two successive bottom joists 4, as illustrated in FIG. 1. In the embodiment shown in FIG. 1, also the bottom joist 4 is composed of a plurality of joist elements 4a of the same length which are arranged successively and whose length is equal to the center distance between the blocks 6. Each joist element 4a extends between and rests on two successive blocks 6, as illustrated in FIG. 1.
In a preferred embodiment, the center distance between neighbouring bottom joists 4 and, consequently, also the lengt
REFERENCES:
patent: 4984404 (1991-01-01), Fabricius
Andreasson Gunnar
Glemberg Ronny
Friedman Carl D.
Smith Creighton
Tarkett AB
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