One piece foam mattress core encasement

Abstract

A one piece foam mattress core or innerspring encasement is a single contiguous piece of foam having a mattress core or base and four perimeter side supports and which fits with a mattress core or innerspring to provide an integrated mattress construction. The mattress core or base of the encasement is positioned below the mattress core or innerspring proximate to or against a bottom surface. The mattress core or base and the perimeter side supports are connected along fold lines or grooves in the single piece of foam so that the perimeter side walls can be folded to vertical positions about a perimeter of the mattress core or innerspring. The single piece of foam of the encasement is producible in different sizes to fit with different size mattress cores or innersprings.

Description

FIELD OF THE INVENTION

The present invention is directed to mattresses and mattress innersprings and more specifically to mattresses which include both wire form innersprings and structural foam components.

BACKGROUND OF THE INVENTION

Foam components are commonly combined with wire or steel form innersprings in mattresses, seating and other flexible support structures. Early versions included foam layers which were either attached directly to a wire innerspring or simply held in position by overlying upholstery. Smaller foam components are designed to fit within spaced of the innerspring.

Different types of foam and foam parts have been used extensively in seating and bedding as flexible support material. Semi-rigid open and closed cell foams of polyethylene, polyurethane or polystyrene have been used in combination with other components and load-bearing structures, such as wire form innersprings and framing to form flexible supports, such as described in U.S. Pat. Nos. 5,048,167; 5,469,590; 5,467,488; 5,537,699; and 5,787,532. In most of these spring support products, the foam pieces surround or interfit with spring elements, and rely on mechanical connection with the spring elements to keep the foam pieces in place. Foam pieces have been adhesively bonded and combined with innersprings. The types of foams used in these applications are typically open-cell polyurethane and latex materials, which can be effectively bonded by compatible adhesives. The open cell structure of these types of foams results in easier compression or lower ILD which is suitable for many bedding and seating applications, particularly for support surface or topper layers underneath upholstery. They are not generally utilized as structural members in a mattress or support cushion in seating. Also, polyurethane and other non-thermoplastic type foams cannot be bonded or welded by any heat-source process due to their decomposition properties.

Some foam shapes have been used integrally with springs to augment or otherwise support metal spring structure, as shown for example in U.S. Pat. Nos. 5,133,116; 5,239,715, 5,467,488; and 5,687,439. Because this use of foam relies on the surrounding metal structure to hold it in place, the foam itself is not in the form of a unitized three-dimensional support structure with its own load bearing capacity.

Another use of foam in connection with an innerspring is disclosed in U.S. Pat. No. 5,787,532, wherein an extruded foam piece is used as a perimeter wall to an innerspring, with fingers which mechanically engage the coils of the innerspring. While this provides some vertical support at the perimeter of the innerspring, it relies on mechanical attachment to the innerspring for the correct orientation. It also only provides support in the vertical direction and does nothing to stabilize the innerspring in the lateral or horizontal direction.

SUMMARY OF THE INVENTION

As described herein, the present disclosure and related inventions describe a mattress innerspring in combination with a mattress core foam encasement having an base located beneath the mattress innerspring, and four perimeter supports which are located about a perimeter of the mattress innerspring. In a preferred embodiment, the base and the four perimeter supports are formed from a single contiguous piece of foam.

In another aspect of the invention, a one piece mattress core foam encasement is described having a substantially rectangular base having a right side, a left side opposite and parallel to the right side, a top side and a bottom side opposite and parallel to the top side, the top and bottom sides being perpendicular to the left and right sides, a right perimeter support connected to the right side of the base along a fold line, a left perimeter support connected to the left side of the base along a fold line, a top perimeter support connected to the top side of the base along a fold line, and a bottom perimeter support connected to the bottom side of the base along a fold line. The base is placed below a mattress innerspring and the right, left, top and bottom perimeter supports are folded in an upward direction such that they are perpendicular to the base and so that the mattress innerspring is surrounded along four sides and a bottom surface by the innerspring support.

DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of the one piece mattress core foam encasement and innerspring of the present invention;

FIG. 2 is a top up view of the one piece mattress core foam encasement;

FIG. 3 is a side view of the one piece mattress core foam encasement of FIG. 2 in the direction of arrows 3-3;

FIG. 4 is a perspective view of an innerspring encased in the one piece mattress core foam encasement;

FIG. 5A is an exemplary foam base for an encasement;

FIG. 5B is the base of FIG. 5A with contour cuts and corners removed to create living hinges alongside axes of the base to create flip-up side-support members disposed around the perimeter of the base;

FIG. 5C is the base of FIG. 5B with flip-up side-support members disposed on sides of the base flipped-up or set about the base to create side support;

FIG. 5D is an assembled one-piece encasement formed by the flip-up side-support members disposed on the head end and foot end of the base additionally flipped-up or set about the base and attached on ends to the flipped-up or set side-support members in FIG. 5C to provide perimeter support around an internal area within the encasement, and

FIG. 6 is a perspective view of the one piece mattress core foam encasement without the innerspring.

DETAILED DESCRIPTION OF PREFERRED AND ALTERNATE EMBODIMENTS

The one-piece foam mattress core encasement 100, as shown in the drawing figures and described herein, is a single piece of foam having a plurality of grooves or cuts that forms a foam encasement about a mattress core, which may be in the form of an innerspring, a block or layers of foam, or fabric-covered or “pocketed” springs, or any combination thereof, all referred to herein as “mattress core”. In a preferred embodiment, a foam mattress core encasement 100 of the present disclosure has a base section which underlies and supports a mattress core, and one or more side walls or “side supports” which extend perpendicularly from the base section in an assembled configuration to provide a perimeter wall that surrounds the outer perimeter of the innerspring.

As shown in FIG. 1, the foam mattress core encasement 100 of the present invention is one contiguous piece of foam that serves as both an base and a perimeter wall support for the mattress innerspring 14. The single piece foam mattress core encasement 100 provides underlying foam support for the mattress core, foam padding and protection for the perimeter of the mattress core, and vertical support at the perimeter of the finished mattress. All of these advantages are achieved without having to assemble multiple foam pieces to form a three-dimensional structure which fits and cooperates with a mattress core.

As shown in FIGS. 1-4, one embodiment of a foam mattress core encasement 100 has a base 10 and four perimeter supports 12a, 12b, 12c, 12d. The base 10 is preferably a rectangular piece of foam having a right side, a left side which is parallel to and opposite the right side, a top side and a bottom side which is parallel to and opposite the top side. The foam material may be in the form of a sheet or slab of generally homogeneous foam, such as polyurethane foam, which may be molded or extruded in the described configurations or fused or adhered together from separate pieces, as further described. The perimeter support includes a right perimeter support 12a, a left perimeter support 12b, a top perimeter support 12c and a bottom perimeter support 12d, which are each elongate foam strips which are connected to each of the four sides of the rectangular base 10. The perimeter supports 12a-12d are preferably flexibly connected to the base 10 along a flexible line of connection which is preferably the same foam material as the base and perimeter supports. For example, the thickness of the foam material may be reduced along the lines of intersection of the perimeter supports 12a-12d with the base 10 whereby the perimeter supports 12a-12d can be folded relative to the base 10 to the perpendicular configuration shown in FIG. 4. The lines of intersection between the perimeter supports 12a-12d and the base 10 may be of any desired thickness and width, and may be contoured or mitered to form a tight joint between the pieces when the perimeter supports 12a-12d are folded relative to the base 10 in the perpendicular configuration shown in FIG. 4. One preferred configuration of the intersections is in the form of generally V-shaped grooves 16 formed by mating 45 degree contours in the facing edges of the perimeter supports 12a-12d and the base 10.

In another embodiment, the base 10 contains several folds or V-shaped grooves 16 run transverse across the width of the base 10 from the right side to the left side. The right and left perimeter supports 12a, 12b which run along the right and left sides of the base 10 each also contain a plurality of folds or grooves, which align with the plurality of folds or grooves of the base. The folds or v-shaped grooves 16a-16c that connect the perimeter supports 12a-12d to the base 10 facilitate folding the perimeter supports 12a-12d upward so that each perimeter support 12a-12d is in an upright position perpendicular to the innerspring or core base 10. These v-shaped grooves 16a-16c create a 120 degree angle between the core base 10 and each perimeter support 12a-12d. The other folds or V-shaped grooves 16a-16c which run across the width of the foundation and right and left perimeter supports 12a, 12b facilitate bending or other such movement when used in combination with mattress cores of different sizes or mattress cores for use with adjustable foundations, and are strategically placed to accommodate the bending or movement of an articulated mattress. A V-shaped notch or cutout 18 exists at each end of the groove positioned proximate to the head 12c of the base 10, as shown in FIGS. 3 and 6. The notch 18 allows the innerspring or core base 10 to bend on itself without deforming. A first groove 16a is positioned horizontally across the support approximately between 24 and 28 inches from the head of the base 10 or from the groove 16d that separates the top perimeter support 12c and the innerspring or core base 10. A second groove 16b is positioned between 18.25 and 18.75 inches from the first groove 16a. A third groove 16c is positioned approximately 12.50 and 13.00 inches from the second groove 16b and approximately between 17 and 20 inches from the bottom of the support or the groove 16e that separates the bottom perimeter support 12d and the base 10.

In one embodiment, the length of the top and bottom perimeter supports 12c, 12d is less than the length of the top and bottom perimeter of the mattress innerspring 14 and the length of the right and left perimeter supports 12a, 12b is greater than the length of the right and left perimeter of the mattress innerspring 14. This configuration provides for four cutout sections 20 that are strategically placed proximate to each corner of the perimeter supports along the top and bottom perimeter supports 12c, 12d, as shown in FIG. 1. The cutouts 20 enable the support to be folded upward to encase the perimeter of the innerspring 14 without any extraneous material. In a preferred embodiment, the cutouts 20 range in size from 5.0 to 5.5 inches. As shown in FIGS. 4 and 5, as the four perimeter supports 12a-12d are folded upward into an upright position which is perpendicular to the base 10, the extra length at the top and bottom of the right and left perimeter supports 12a, 12b fold along the fold line or groove 16d, 16e so that they are perpendicular to the right and left perimeter supports 12a, 12b. This extra length fills in the space along the top and bottom perimeter such that each of the right, left, top and bottom perimeter supports 12a-12d completely cover the entire perimeter of the mattress innerspring 14. In an alternate embodiment, the length of the right and left perimeter supports 12a, 12b is less than the length of the right and left perimeter of the mattress innerspring 14 and the top and bottom perimeter supports 12c, 12d is greater than the length of the top and bottom perimeter of the mattress innerspring 14. Here, the four cutouts 20 are located along the right and left perimeter supports 12c, 12d. In another embodiment, shown in FIG. 2, two cutouts may be contained along the bottom perimeter support 12d, one cutout is located along the right perimeter support 12a and one cutout is located along the left perimeter support 12b. Any two sides of the perimeter support may be longer than the corresponding mattress perimeter while the other two sides are shorter than the corresponding mattress perimeter so that the entire perimeter may be folded upward and the longer sides can be folded perpendicularly to fill the gap on an adjacent shorter side.

The height of each of the four perimeter supports 12a-12d is substantially equal to the height of the mattress innerspring 14. In a preferred embodiment, the height perimeter support is approximately between 6.5 and 7.0 inches.

The perimeter support 10 is attached to the innerspring in a preferred embodiment, by fastening the edges of the perimeter support to every other innerspring coil with a hog or C-ring. Once each of the perimeter supports 12a-12d is folded upward so that the perimeter supports 12a-12d are perpendicular in relation to the innerspring or core base 10 and they surround the perimeter of the mattress innerspring 14, the mattress innerspring 14 is encased within the one piece mattress core foam encasement 100 much like an inverted box top, as shown in FIG. 4. The one piece support provides both vertical and horizontal support.

FIGS. 5A-5D illustrate another embodiment of an encasement that may be provided. In this embodiment as illustrated in FIG. 5A, an encasement 50 is provided that is comprised of a base 52. In this embodiment, the encasement 50 is constructed from a one-piece base 52 as opposed to additional or separate pieces being required to provide an assembled encasement. The base 52 may be manufactured from extruded polymer foam. As examples of the wide variety of alternate compositions that can be employed and effectively used, the base 52 may be formed from one or more materials selected from the group consisting of polystyrenes, polyefins, polyethylenes, polybutanes, polybutylenes, polyurethanes, polyesters, ethylene acrylic copolymers, ethylene-vinyl-acetate copolymers, ethylene-methyl acrylate copolymers, ethylene-butyl-acrylate copolymers, ionomers, polypropylenes, copolymers of polypropylene, and the like. Such polymers may be foamed to provide the base 52 including either open-cell foam, closed-cell foam, or both open and closed-cell foam. An example of an extruded polymer base and method of manufacture of same are disclosed in U.S. Pat. Nos. 6,537,405 entitled “Spiral Formed Products and Method of Manufacture,” and 6,306,235 entitled “Spiral Formed Products and Method of Manufacture,” both of which are incorporated herein by reference in their entireties. The density of the base 52 may be any density desired.

The base 52 may optionally include one or more extruded channels 53 disposed along longitudinal axes C₁-C_N to reduce material and thus reduce costs and/or to provide spring-like action in the base 52. FIGS. 5B-5D illustrate how the encasement 50 is provided from the base 52 in FIG. 5A in this embodiment. As illustrated in FIG. 5B, two sets of contour cuts 54A, 54B are disposed along longitudinal axes D₁, D₂ in the base 52 to provide living hinges 55A, 55B. In this manner, flip-up side-support members 56A, 56B are formed about the living hinges 55A, 55B. The flip-up side-support members 56A, 56B can be rotated approximately ninety degrees (90°) towards an internal area 60 of the base 52 to provide two sides of perimeter support as part of constructing the encasement 50.

In this embodiment, corners 62 are cut out from the base 52. Turning back to FIG. 5B, the corners 62 are cut out and contour cuts 64 are also disposed along axes D₃, D₄ in the base 52. These contour cuts 64 provide living hinges 66A, 66B in the base 52 to create additional flip-up side-support members 68A, 68B. In this manner, the flip-up side-support members 68A, 68B can also be flipped up or set about the base 52 to provide an enclosed encasement 50, as illustrated in FIGS. 5C and 5D. Additional contour cuts 70A, 70B, are disposed in each of the flip-up side-support members 68A, 68B so that ends 72, 74 of the flip-up side-support members 68A, 68B can abut end portions 76, 78 of the flip-up side-support members 56A, 56B to provide an assembled encasement 50, as illustrated in FIG. 5D. The contour cuts 64, 70A, 70B can be made for example at forty-five degrees across a section of the respective support member to form a mitered cut for a ninety degree joint between the support members and/or with the base 52. The flip-up side-support members 56A, 56B, 68A, 68B can be interlocked together according to any of the methods previously described to form an internal area 84 in the encasement 50, as illustrated in FIG. 5D, to provide perimeter support, including edge or side support. Any of the aforementioned surface support structures can be disposed in the internal area 84 to provide an assembly, which may be for a mattress or other bedding or cushioning application.

In a preferred embodiment, the foam used for the combined foundation and perimeter support is low density polyethylene and is approximately ⅝ inches, although it is anticipated that other types of foam with varying thickness measurements may be used. The low density polyethylene foam has a density of approximately 1.12 lb/ft³. The base piece is placed below the mattress innerspring and covers the entire bottom surface of the innerspring. The size of the support will vary depending on the size of the mattress (e.g. king, queen, twin, etc.). The support may range from 50 to 86 inches wide and from 87 to 97 inches in length. The weight of the support may range from 1.50 to 3.5 lbs.

Prior to placing the mattress atop the innerspring which is encased within the one-piece foundation and perimeter support, a layer of non-woven fabric may be placed directly on top of the innerspring. The layer of non-woven fabric serves as an insulator and also prevents the coils from damaging the foam layers of the mattress assembly. In a preferred embodiment, the non-woven fabric layer is spunbond polypropylene, although other materials can be used.

It will be appreciated by persons skilled in the art that numerous variations and/or modifications may be made to the invention as shown in the specific embodiments without departing from the spirit or scope of the invention as broadly described. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. Other features and aspects of this invention will be appreciated by those skilled in the art upon reading and comprehending this disclosure. Such features, aspects, and expected variations and modifications of the reported results and examples are clearly within the scope of the invention where the invention is limited solely by the scope of the following claims.

Claims

1. A mattress core in combination with a foam encasement, the mattress core foam encasement comprising: a base located beneath the mattress core;four perimeter supports which are in direct contact with a perimeter of the mattress core;wherein the base and the four perimeter supports are part of a single contiguous piece of foam, the perimeter supports being folded relative to the base to extend perpendicularly from the base and substantially surround a perimeter of the mattress core.

2. The mattress core foam encasement combination of claim 1, wherein the mattress core foam encasement is made of polyethylene.

3. The mattress core foam encasement combination of claim 1, wherein the base of the foam encasement has a plurality of v-shaped grooves.

4. The mattress core foam encasement combination of claim 1, wherein the foam encasement further comprises a generally V-shaped groove between the base and each of the four perimeter supports.

5. The mattress core form encasement combination of claim 1, wherein the mattress core is in direct contact with the base.

6. The mattress core foam encasement combination of claim 1, wherein the density of the foam encasement is in a range of approximately 1.0 to 1.5 lb/ft3.

7. The mattress core foam encasement combination of claim 1, wherein the foam encasement has a total weight in an approximate range of 1.75 lbs, to 3.27 lbs.

8. The mattress core foam encasement combination of claim 1, wherein a width dimension of the foam encasement is in an approximate range of 50 inches to 86 inches.

9. The mattress core foam encasement combination of claim 1, wherein a length dimension of the foam encasement is in an approximate range of 87 inches to 97 inches.

10. The mattress core foam encasement combination of claim 1, wherein a height dimension of the four perimeter supports when oriented perpendicular to the base is in a range of approximately 6.5 inches to 7.5 inches.

11. A one piece mattress core foam encasement comprising: a substantially rectangular base having a right side, a left side opposite and parallel to the right side, a top side and a bottom side opposite and parallel to the top side, the top and bottom sides being perpendicular to the left and right sides;a right perimeter support connected to the right side of the base along a fold line;a left perimeter support connected to the left side of the base along a fold line;a top perimeter support connected to the top side of the base along a fold line;a bottom perimeter support connected to the bottom side of the base along a fold line;wherein the base is placed below a mattress core and the right, left, top and bottom perimeter supports of the foam encasement are folded relative to the base and positioned generally perpendicular to the base and about a perimeter of the mattress core, andwherein the base and the mattress core have substantially the same length and width measurements.

12. The one piece mattress core foam encasement of claim 11, wherein the mattress core foam encasement is made of polyethylene.

13. The one-piece mattress core foam encasement of claim 11, wherein the fold lines between the base and the right, left, top and bottom perimeter supports are in the form of generally V-shaped grooves having an angle of approximately 120 degrees.

14. The one piece mattress core foam encasement of claim 11, wherein the base and the right and left perimeter supports include a plurality of v-shaped grooves.

15. The one piece mattress core foam encasement of claim 11, wherein the base is connected to the right, left, top and bottom perimeter supports at connection which have a generally V-shaped configuration.

16. The one piece mattress core foam encasement of claim 11, wherein the right, left, top and bottom perimeter supports and the mattress core have substantially the same height measurement.

17. A mattress comprising a mattress core and a one piece foam encasement positioned about the mattress core: the one piece foam encasement having a substantially rectangular base having a right side, a left side opposite and parallel to the right side, a top side and a bottom side opposite and parallel to the top side, the top and bottom sides being perpendicular to the left and right sides;a right perimeter support connected to the right side of the base along a fold line;a left perimeter support connected to the left side of the base along a fold line;a top perimeter support connected to the top side of the base along a fold line;a bottom perimeter support connected to the bottom side of the base along a fold line;wherein the base of the one piece foam encasement is positioned proximate to a major surface of the mattress core and the right, left, top and bottom perimeter supports are positioned proximate to respective sides of the mattress core;and upholstery which fits over the mattress core and the one piece foam encasement.

18. The mattress of claim 17 wherein the right or left perimeter support has a length dimension which is greater than a length dimension of the base, and wherein the top perimeter support or bottom perimeter support has a length dimension which is less than a width dimension of the base.

19. The mattress of claim 17 wherein the right or left perimeter support has a length dimension which is less than a length dimension of the base, and wherein the top perimeter support or bottom perimeter support has a length dimension which is greater than a width dimension of the base.