Box spring frame
A box spring is a resilient foundation for a mattress. Modern bedding structures commonly have separate bedding components which together form a complementary system having an upper mattress resting on top of a mattress foundation, which in turn is held above a floor surface by a bed frame. Three of the most common types of upper mattresses are an inner spring mattress typically having a plurality of wire coil modules arranged in an rectangular array and defining top and bottom planes; a foam core bed mattress having one or more layers of foam defining top and bottom planes; and a fluid filled bed mattress such as a waterbed or air mattress. The mattress foundation may include a relatively rigid or resilient core assembly, and sometimes may be referred to as a "box spring" in the trade. It comprises a base frame surmounted by an assembly of wire springs, the upper surface of which is padded, and the whole encased within a pre-sewed box-like ticking tacked or stapled to the underside of the base frame around its periphery. A dust cover of light plastic film, or the like, is usually also applied to the underside of the base frame. Spring assemblies found in box springs take a variety of forms, e.g., single-cone coils, double-cone coils, and, more recently, so-called wire torsion springs. In addition to these conventional commercial forms, the prior art suggests a variety of other forms of springs as well. As far as the present invention is concerned, the particular form of spring assembly employed in the box spring is of little importance. Typically, such bed frames include a pair of side bars, which are connected together by a pair of cross bars having downward extending feet, so that the box spring and mattress resting on the frame are elevated about 4 to 8 inches above the floor. The cross bars and side bars are made from angle irons, and there are various ways of attaching them together to provide an unitary structure which can be assembled and disassembled. It is conventional practice to use screw-type fasteners to connect the side bars and cross bars.
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