Patent Application
20110314601
This invention relates generally to bedding, and more particularly, to a bedding foundation having a nestably stackable spring assembly.
Bedding foundations or so-called box springs generally include a base and an upper grid including a generally rectangular border wire between which coil or bent wire spring modules are located. As thus manufactured, these box spring assemblies are bulky and shipping them to the manufacturer for application of padding and covering thereto is costly because of space requirements. To reduce the space requirements, it is customary to compress the assemblies to reduce their individual thicknesses and to tie them in their compressed state. This involves using presses and ties which are expensive, and the extra operations of pressing and tying the assemblies also adds to their manufacturing cost. At the delivery end, the manufacturer must cut and discard the ties before applying the covering. These additional material and handling expenses increase the end cost of box spring assemblies.
Box spring assemblies by their very nature are intended to provide a stable support foundation for mattresses or other bedding placed on top thereof. Toward that end, the components used in the box spring assemblies should be securely and firmly mounted in the assembly to avoid any wobble or shifting during use.
U.S. Pat. Nos. 5,052,064 and 7,237,282 disclose bedding foundations having nestably stackable spring assemblies which may reduce shipping costs. However, each of the foundations disclosed in these patents has an upper border wire having a round cross-sectional configuration.
The border wire of these and other known bedding foundations is often three-gauge having a diameter of 0.243 inches. To make a border wire having the same beam strength, but made from a smaller diameter wire, say four-gauge wire having a diameter of 0.224 inches, would save material and therefore reduce the end cost of the foundation. In order to achieve the same beam strength, the four-gauge border wire must be changed or shaped from a circular cross-section to a rectangular cross-section in accordance with the present invention. Thus, the present invention enables one to use a four-gauge wire rather than a three-gauge wire in the border wire of the bedding foundation and therefore, reduce wire cost without giving up any beam strength.
In order to achieve cost savings, it would be desirable to reduce the cross sectional area of the border wire of a bedding foundation (by creating the border wire from a smaller diameter wire) while maintaining the same beam strength or increasing it.
Therefore, a bedding foundation having a nestable, stackable spring assembly including a border wire with a rectangular cross-section that can be stacked for shipping without having to compress and tie the spring assembly would be a significant improvement.
This invention provides the desirable cost savings in wire without compromising the integrity of known bedding foundations. In one embodiment, this invention is a bedding foundation having a nestably stackable spring assembly which may be shipped separately than the bases of the foundations. This bedding foundation comprises a rectangular base and a spring assembly fixedly attached atop the base. Padding overlies the spring assembly and a fabric covering surrounds the spring assembly, padding and base.
The nestable stackable spring assembly includes a rectangular border wire having two parallel sides and two parallel ends. The border wire has a generally rectangular cross-sectional configuration with the height being greater than the width of the cross-section. The spring assembly further comprises a plurality of spaced and longitudinally extending support wires parallel to the border wire sides and extending between the border wire ends. Each support wire has ends connected to the border wire ends and is a continuous piece of wire. These support wires are generally corrugated along their lengths, having a plurality of peaks and a plurality of valleys. The flattened distal portions of the peaks are generally co-planar with the plane defined by the border wire, and the flattened distal portions of the valleys are displaced beneath and intermediate of the peaks.
The spring assembly further comprises longitudinally spaced, parallel and transversely extending upper connector wires parallel to the border wire ends and connected along their lengths to the peaks of the support wires. In addition, the spring assembly may comprise a plurality of longitudinal wires welded to the upper connector wires and having ends crimped around the border wire ends and extending parallel the border wire sides.
The longitudinal voids between the peaks of the support wires are of a greater dimension than the valleys of the support wires. This configuration enables one spring assembly to be nestably stacked atop a second spring assembly since the support wire valleys of the first assembly fit into the voids between the peaks of the support wires of the second assembly. Such a nested and stacked arrangement results in a total height dimension which is less than the sum of the individual assembly height dimensions.
The border wire of the spring assembly of this invention has a unique cross-sectional configuration which enables the border wire to be made of a larger gauge, smaller diameter wire than heretofore known in art without comprising the beam strength of the border wire when compared to prior art border wires having a round cross-sectional configuration. The smaller diameter wire, when re-shaped from a circular cross-section into a rectangular cross-section, has the same cross-sectional area as when it had a circular cross-section. One advantage of this invention is that it enables a bedding foundation having a wire core to be made using less steel or material, thereby reducing the ultimate cost of the foundation to the foundation's assembler.
In addition to reducing the quantity of wire necessary to manufacture a spring core for use in a bedding foundation, the unique shape of the border wire of the present invention provides a secure connection between the ends of the support wires and the border wire.
Although one type of wire core has been described, the present border wire may be used in any bedding foundation. For example, individual coil springs may be used rather than generally corrugated support wires, the individual coil springs being clipped to the unique border wire of this invention.
The objectives and features of the invention will become more readily apparent from the following detailed description taken in conjunction with the accompanying drawings in which:
Referring first to
The foundation 10 has a base 12, including a rectangular base frame 13 on which transverse wooden slats 14 are attached. A nestably stackable spring assembly or wire core 16 is fixed atop the base 12 and, more particularly, secured to the transverse slats 14 of base 12 with staples 15, as shown in
The nestably stackable spring assembly 16 includes a rectangular steel border wire 22 having two parallel sides 24, 24 and two parallel ends 26, 26. The parallel sides 24, 24 are longer than the parallel ends 26, 26 in the embodiment illustrated.
Transversely spaced, parallel, and longitudinally extending steel support wires 28 are parallel to the border wire sides 24, 24 and have ends 30 which are welded to and/or crimped around the ends 26, 26 of the border wire 22. These support wires 28 are formed so as to be generally corrugatedly-shaped along their lengths, having peaks 32 and valleys 34. These peaks 32 and valleys 34 are flattened at their respective distal portions 36 and 38, respectively. See
Longitudinally spaced, parallel and transversely extending steel upper connector wires 40 extend parallel to the border wire ends 26, 26 and have ends 42 which are welded to and/or crimped around the border wire sides 24, 24. These upper connector wires 40 are welded intermediate of their ends 42, 42 along their lengths at intersections 44 to the flattened peaks 36 of the support wires 28.
The support wires 28 have flattened distal peak portions 36 and flattened distal valley portions 38, with the support wire ends 30 being welded to and/or crimped around the border wire 22. In this embodiment, two upper connector wires 40 per flattened distal peak portion 36 are illustrated. However, any number of upper connector wires 40 may be secured, i.e., welded to each flattened distal peak portion 36 of each support wire 28. The distal valley portions 38 of the support wires 28 may be stapled or otherwise attached to the transverse slats 14 which are in turn affixed to the base frame 13.
If desired, additional steel end wires (not shown) may be added either before or after the stackable spring assembly 16 has reached its final assembly destination. These end wires have spaced ends which are crimped around the border wire 22 and the endmost upper connector wire 40, respectively. These end wires provide additional stiffness to the stackable assembly 16 in an edgemost location of the ends of the assembly 16 so as to prevent the end border wires from deflecting and being permanently distorted when a person sits on the end of a bed of which the foundation forms a part. Such steel end wires are shown in U.S. Pat. No. 5,361,434, which is hereby incorporated by reference in its entirety.
Referring again to
The nestably stackable spring assembly 16 of bedding foundation 10 is generally manufactured by a supplier, who then ships it to an assembler. The assembler adds to the spring assembly 16 the wooden base 12, incorporates padding 18, and covers the components with upholstery 20 to make a completed product.
This invention facilitates shipment of the metal core or stackable assembly 16 by a supplier to the assembler. With reference to
One advantage of the spring assembly 16 and associated bedding foundation 10 according to this invention is that the border wire 22 is uniquely configured to enable the border wire 22 to be made of a lesser gauge, smaller diameter wire than existing border wires without giving up any strength. In the embodiment of the bedding foundation 10 and associated spring assembly 16 shown in the drawings, the border wire 22 has a rectangular cross-sectional configuration with the height H2 of border wire 22 being greater than the width W2 of the border wire 22. See
One of ordinary skill in the art will readily recognize that the alternative embodiments of the foundation unit 10 shown herein are exemplary only of a wide variety of alternative configurations that are readily possible within the scope of this invention.
From the above disclosure of the general principles of the present invention and the preceding detailed description of at least one preferred embodiment, those skilled in the art will readily comprehend the various modifications to which this invention is susceptible. Therefore, we desire to be limited only by the scope of the following claims and equivalents thereof.
