Spring devices – Spring panel – Spring means spacing loading surface vertically from plane...
Reexamination Certificate
1998-09-21
2001-01-09
Mar, Michael (Department: 3613)
Spring devices
Spring panel
Spring means spacing loading surface vertically from plane...
C267S165000, C267S149000, C005S719000, C005S718000, C005S247000
Reexamination Certificate
active
06170808
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a spring core for mattresses and seat cushions with leaf springs.
2. Description of the Related Technology
Spring cores for mattresses and seat cushions with spiral springs are known. These spring cores, which come in various embodiments, are not corrosion-resistant. They cannot be made of plastic but instead must be made only of spring steel wire.
It is also known that foam inserts and various natural fiber inserts with elastic fillers can be used as a substitute for metal spring cores in mattresses and seat cushions. These inserts have the disadvantage of very poor air circulation with the related unfavorable moisture regulation which can develop fungus. The insert material can also suffer from fatigue and deformation. In addition, extensive lathing is necessary for ventilation.
As is apparent in Austrian Patent No. 399,994, spring cores are known with leaf springs consisting of two plates arranged opposite one another with spring elements bent out of them. This design can be used only to a limited extent because the connecting webs between the passages punched in the plates do not permit a point load and thus do not permit limited or local-only deformation.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to create a spring core that can be produced from plastic, permits adequate circulation of air, and permits a point load.
These objects are achieved by the fact that the spring core consists of a plurality of spring elements bent up out of passages punched in a plate, where each spring element has an upper and a lower spring clip, with the upper spring clip being bent up out of a passage punched in the lower spring clip.
This embodiment of the spring elements yields a plurality of leaf spring systems, where each spring element can be loaded individually without affecting an adjacent spring element. This yields the special advantage that the spring core according to this invention permits optimum ventilation and a point load.
An especially advantageous embodiment is achieved when the spring core according to this invention is extrusion-coated with foam and the interior of the spring elements is kept free of foam, so the mattress or seat cushion can be ventilated optimally, thus permitting better moisture regulation. In addition, the lathing which has been required in the past can thus be eliminated.
Another especially advantageous embodiment is achieved when isolated spring elements arranged one after the other are extrusion-coated with foam in such a way that the interior of the spring elements is kept free of foam, thus permitting optimum ventilation and flexibility of the mattress.
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Fulbright & Jaworski L.L.P.
King Bradley
Mar Michael
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