Spring devices – Bendable along flat surface – Bow spring or superposed spring elements
Patent
1994-08-01
1997-05-27
Oberleitner, Robert J.
Spring devices
Bendable along flat surface
Bow spring or superposed spring elements
5247, 5769, 29745215, 267103, A47C 2302, F16F 120
Patent
active
056324731
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an elastic framework for a mattress, or upholstery. The elastic framework is efficient, non-expensive lightweight, non-degradable by oxidation and easy to manufacture.
2. Description of the Background Art
Metallic springs have been used many years in the manufacture of mattress, chairs, upholstery, etc., without much evolution. Their manufacture, in steel wire becomes complex because of their automatic coiling by expensive machinery and their further need of tempering the steel. The automatic machinery that perform these two operations cost considerable amounts today and are accessible only to large companies. Also, interconnecting these springs manually to form the framework of a mattress or chair is complex, slow and expensive, because the process requires plenty of labor or very high cost automatic machinery.
Further, a framework of springs is heavy, noisy and subject to oxidation. In the manufacture of a mattress based on a framework of metallic springs, there exists a problem with a difficult solution. A padded lining must be placed next to the springs so that the person using the mattress does not feel the hardness and irregularity of the wires that make up the framework.
SUMMARY OF THE INVENTION
The basic foundation of a mattress, chair, etc., is its framework, making the unit homogeneous, solid and elastic to support the human body.
In the present invention the elastic spring elements are made in a convenient shape and size and manufactured of injected plastic, in molds. The resilience, flexibility and strength will be identical to a conventional spring made of steel wire. Different kinds of material utilized in the injection will give different characteristics, i.e., more or less flexibility to the spring, from the same mould.
The elastic spring elements are interconnected by means which fit together and form a superior and inferior lid which are interconnected by interdependent means. These independent means form a complete framework with two plane surfaces, which may be perforated for economy of material or to allow ventilation.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1a is a top side view of a first embodiment of elastic spring element according to the present invention;
FIG. 1b is a section view of the elastic spring element taken along line I--I of FIG. 1a.
FIG. 2 is a top view of the elastic spring elements of the invention in combination with support elements;
FIG. 3 is a side view of a frame of a mattress according to the present invention showing bracing to prevent a sideways motion between the top support elements and the bottom support elements;
FIG. 4 illustrates how the support elements are connected to the elastic spring elements;
FIGS. 5a and 5b show an elastic spring element according to a second embodiment of the present invention under load and no-load, respectively, wherein the elastic spring element is connected to upper and lower support elements which include stoppers to limit the compression of the spring when excessive loads are applied;
FIGS. 5c and 5d show an elastic combination spring, formed of two elastic spring elements of the second embodiment of the present invention, under load and no-load, respectively;
FIG. 5e is a top view of the elastic combination spring shown in FIGS. 5c-5d;
FIGS. 5f and 5g illustrate front and end views, respectively, of a spring according to a third embodiment of the invention which employs a closed ring, of constant width and thickness to form an elastic spring.
FIGS. 5h and 5i illustrate an elastic combination spring formed of two closed rings fabricated as illustrated when under load and no load, respectively.
FIGS. 5j to 5i illustrate three elastic conbination springs made from four, three, and two rings, respectively, as seen in elevation; and FIGS. 5m to 5o illustrate the same three elastic combination springs, respectively, as seen in plan view.
FIGS. 6a and 6b show a top view and side view, respectively, of a mattress loading condition;
FIG.
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Oberleitner Robert J.
Schwartz Chris
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