Patent Publication Number: US-2023148764-A1

Title: Zipper Mattress Attachment

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S application Ser. No. 17/036,541, filed on Sep. 29, 2020, which claims the benefit of U.S. Provisional Application Ser. No. 62/935,762, filed Nov. 15, 2019. The disclosure of the prior application is considered part of (and is incorporated by reference in) the disclosure of this application. 
    
    
     TECHNICAL FIELD 
     This invention relates to beds, and more particularly, to beds with zippers. 
     BACKGROUND 
     People have traditionally used beds that come in many shapes, sizes, and styles. Such beds can range from extremely simple designs to rather complex designs that include a variety of features. For example, some beds include mattresses that include foam, inner-springs, air chambers, other materials, or combinations thereof. 
     Such mattresses may be supported by a structure such as a frame, box spring, adjustable foundation, or a non-adjustable foundation. For adjustable foundations, portions of the mattress can be raised and lowered, such as a head and foot of the mattress. 
     SUMMARY 
     Some embodiments of a bed system provided herein can include one or more of the features and functions disclosed herein. In particular, the bed system can include an adjustable foundation, a mattress positioned on the adjustable foundation, wherein the mattress has a head end and a foot end, and a zipper that extends from the head end to the foot end of the mattress. The zipper can connect the mattress to the adjustable foundation. The zipper can comprise a first zipper tape attached along a seam of an underside of the mattress and a second zipper tape attached along a seam of a top of the adjustable foundation. The first and second zipper tapes can include first and second teeth, respectively, and the second teeth can be configured to engage the first teeth. The zipper connecting the mattress to the adjustable foundation can be configured to retain the mattress to the adjustable foundation when the adjustable foundation is actuated to raise at least one of the head end and the foot end of the mattress. In some embodiments, the first zipper tape can be attached to the underside of the mattress by sewing the first zipper tape into the seam of the underside of the mattress. In addition, the second zipper tape can be attached to the top of the adjustable foundation by sewing the second zipper tape into the seam of the top of the adjustable foundation. 
     In yet other embodiments, the foundation can have a first perimeter and the mattress can have a second perimeter. The first zipper tape can be connected to a top of the foundation at a first zipper location that is interior of the first perimeter. The second zipper tape can be connected to an underside of the mattress at a second zipper location that is interior of the second perimeter. The first and second zipper locations can be substantially vertically aligned. The first zipper tape can be sewn into a seam interior to the first perimeter along the top of the foundation and the second zipper tape can be sewn into a seam interior to the second perimeter along the underside of the mattress. 
     In some embodiments, the adjustable foundation can also provide at least one articulation point, wherein the zipper extends across the at least one articulation point. The adjustable foundation can comprise a platform with at least a head panel, a middle panel, and a foot panel, wherein at least one panel is raised or lowered when the adjustable foundation is actuated. The articulation point can also be positioned between the head panel and the middle panel such that the zipper extends along a portion of the head panel, across the articulation point, and along a portion of the middle panel. 
     In some embodiments, the bed system can further comprise an air chamber within the mattress, wherein a second zipper connects the air chamber to an interior portion of the mattress. In such embodiments, the zipper connecting the mattress to the adjustable foundation can be substantially vertically aligned with the second zipper connecting the air chamber to the interior portion of the mattress. Further, the second zipper can be attached along a seam of at least one of a bottom of the air chamber and the interior portion of the mattress. In some embodiments, the second zipper can be attached at a corner of the air chamber. In yet other examples, a first zipper tape of the first zipper and a second zipper tape of the second zipper can be sewn to a common seam of a mattress cover. In some embodiments, the bed system can further comprise an upside down foam tub positioned above the air chamber. 
     The bed system can further comprise a mattress cover surrounding the mattress, wherein the zipper is attached to the mattress cover and configured to couple the mattress cover to the top of the adjustable foundation at a bottom of the mattress. The zipper can be attached along a seam of at least one of an exterior underside of the mattress cover and the top of the foundation. 
     In some embodiments, the adjustable foundation can further comprise an actuator and a controller. The controller can be operably connected to the actuator and configured to drive the actuator to actuate at least one portion of the adjustable foundation between a lower position and an upper position. The bed system described herein can further comprise an air controller having a pump fluidly connected to an air chamber within a core of the mattress, wherein the air controller can be configured to adjust a fluid pressure within the air chamber. 
     A method is also discussed herein for attaching a mattress to a foundation. The method comprises positioning the mattress on the foundation, aligning a first zipper tape along a seam of an underside of the mattress with a second zipper tape along a seam of a top of the foundation, and coupling the mattress to the foundation by engaging teeth of the first zipper tape with teeth of the second zipper tape. 
     A system can include a foundation, a mattress, and a zipper. The mattress can have a mattress core and a mattress cover covering the mattress core. The zipper can connect the mattress core to the foundation. In some embodiments the system can have one, more or all of the following features. The mattress core can be an air chamber. The mattress cover can define a zipper hole through which the zipper extends when connecting the mattress core to the foundation. The foundation can be an adjustable foundation. The zipper can include a first tape attached to the mattress core and a second tape attached to a platform of the foundation. A second zipper can connect the mattress core to the foundation. The zipper can extend through the mattress cover. 
     Some embodiments of a bed system with zippers can provide several advantages. Use of the zippers can ensure that the mattress remains in place on the foundation and does not fall off the foundation over time. Additionally, zippers positioned interior to a perimeter of the mattress and interior to the perimeter of the foundation can be hidden from sight. As a result, the mattress and foundation can appear to be seamlessly coupled to each other. Moreover, the zipper can extend from the head end of the mattress to the foot end of the mattress and over one or more articulation points. As a result, when the adjustable foundation is actuated, the mattress can bend or articulate accordingly while the zipper can retain the mattress to the foundation. In other words, as the adjustable foundation is actuated and the mattress bends accordingly, the mattress can remain coupled to the foundation and bend with the foundation without falling off or becoming undesirable misaligned with the foundation. Furthermore, the zipper can be sewn into or along the seam of the mattress and the seam of the foundation so that the zipper can take advantage of the strength of the seam. As a result, the zipper can be less likely to come undone or break while the mattress is attached to the foundation. The zipper can also take advantage of the strength of the seam when the adjustable foundation is actuated and a portion of the mattress is raised or lowered. Finally, when the mattress has an air chamber within the mattress, a zipper can be included for retaining the air chamber to a mattress cover and another zipper can retain the mattress cover to the foundation. Such an arrangement with a zipper inside the mattress cover and another zipper outside the mattress cover can help hold the air chamber (or another mattress core for embodiments without an air chamber) in place during articulation of an adjustable foundation. In some embodiments, internal and external zippers can be aligned adjacent to one another so as to further strengthen connections. This can be especially beneficial when the adjustable foundation is actuated and a portion of the mattress is raised or lowered. 
     These and other embodiments can each optionally include one or more of the features described below. Particular embodiments of the subject matter described in this specification can be implemented so as to realize none, one, or more of the advantages described herein. 
     The details of one or more embodiments are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the invention will be apparent from the description and drawings, and from the claims. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    depicts an embodiment of a bed system having a foundation and a mattress. 
         FIG.  2 A  depicts a top view of the foundation of  FIG.  1   . 
         FIG.  2 B  is a bottom view of the mattress of  FIG.  1   . 
         FIG.  3    is a side view of the foundation and mattress of  FIG.  1   . 
         FIG.  4    is a schematic end view of the bed system of  FIG.  1   . 
         FIG.  5    is a view of two zippers as implemented in one embodiment of the bed system of  FIG.  1   . 
         FIG.  6    is a schematic view of another embodiment of a bed system. 
     
    
    
     DETAILED DESCRIPTION 
     Over time, a mattress can fall off or slide around on a foundation, such as an adjustable foundation. To overcome this concern, one or more zippers can be used to attach the mattress to the foundation. Accordingly, the mattress can be coupled (i.e., zippered) to the foundation. As a result, the mattress can remain in place on the foundation. The mattress can also be easily moved from or on the foundation by undoing the zipper. In embodiments of a bed system that has an adjustable foundation, the adjustable foundation can be used to selectively raise and lower a head and/or a foot of the mattress. In some embodiments, a mattress can be relatively heavy and/or flexible so as to naturally contour to the adjustable foundation&#39;s shape under force of gravity when one or more portions of the adjustable foundation are articulated. In other embodiments, a mattress can be relatively light weight and/or stiff so as to bend less under the force of gravity when one or more portions if the adjustable foundation are articulated. For either embodiment (and particularly for embodiments that have a mattress that is relatively light weight and/or stiff), a zipper attachment mechanism can be used to hold the mattress to the foundation during articulation such that the shape of the mattress can more closely follow the shape of the foundation. 
       FIG.  1    discloses a bed system  100  that includes a mattress  102  and a foundation  104 . The mattress  102  can have a mattress cover  106  that includes a fabric  105 , and the mattress cover  106  can enclose various internal parts (not shown) of the mattress  102 , such as foam, springs, air chambers, and or other components suitable for the application. The fabric  105  of the cover  106  can be hypoallergenic or any other type of material intended to protect the mattress  102  from spills, stains, bacteria, and other allergens. In some embodiments, the fabric of the mattress cover  106  can be water-resistant. The fabric of the cover  106  can also allow for airflow and breathability. The cover  106  can be configured to fit over the entire mattress  102 . In some embodiments, the cover  106  can be zippered around the mattress  102 . In other embodiments, the cover  106  can be held in place around the mattress  102  by any other mechanism including but not limited to velcro, buttons, snaps, or other fasteners. The cover  106  can further have one or more seams  107  that can run along a length of the cover  106 , for example from a head end to a foot end of the cover  106 . The one or more seams  107  can also be positioned interior to a perimeter of the cover  106 . Moreover, the one or more seams can be positioned around corners of the cover  106  such that the cover  106  is fitted around the mattress  102  having a particular height, length, and width. In some embodiments, the cover  106  can be an optional addition to the bed system  100 . In other embodiments, the cover  106  can already come fitted to the mattress  102  in the bed system  100 . In some embodiments, the cover  106  can be removable. 
     The mattress  102  defines a mattress top  108 , a mattress bottom  110 , and a mattress perimeter  112 . In some embodiments, the seams  107  of the mattress  102  can be positioned on one, more, or all of the mattress top  108 , the mattress bottom  110 , and the mattress perimeter  112 . For example, in some embodiments the mattress  102  can have some of the seams  107  around the mattress perimeter  112 . Such seams  107  can connect one piece of fabric to another piece of fabric. In some embodiments, the seams  107  can be functional, aesthetic, or both. In some embodiments, the mattress  102  can have seams  107  on the mattress bottom  110 . Such seams can be hidden from view when the mattress  102  is positioned on the foundation  104 . 
     The foundation  104  has a foundation perimeter  120 . The foundation  104  can include a platform  114  and legs  116 . The platform  114  can define a foundation top  118 . In some embodiments, the platform  114  can be made from a wood material, including but not limited to wood (such as medium density fiberboard or plywood), or other materials suitable for the application. The platform  114  can be covered in fabric, batting, or other materials. 
     The platform  114  of the foundation  104  can have one or more panels (e.g. a head panel, a foot panel, and one or more middle panels). In some embodiments, the foundation  104  can be an adjustable foundation configured to raise and lower one or more panels of the platform  114 , which, in turn, raise or lower portions of the mattress  102 . The adjustable foundation can be actuated via a controller and/or manually actuated by a user. 
     The mattress  102  can be connected (i.e., coupled) to the foundation  104  by a zipper  122 . In some embodiments, the mattress  102  can be coupled to the foundation  104  by multiple zippers  122 . In the embodiment of  FIG.  1   , the zipper  122  extends from a position proximate a head end of the mattress  102  to a position proximate a foot end of the mattress  102 . Thus, the zipper  122  extends substantially a full length of the mattress  102 . In some embodiments, the bed system  100  further includes a second zipper  122  (see  FIG.  2 B ) that extends substantially a full length of the mattress  102  on the other side of the mattress  102 , substantially parallel to the zipper  122 . The zipper  122  includes zipper tapes  124 A and  124 B and zipper teeth  126 A and  126 B attached to the zipper tapes  124 A and  124 B, respectively. The zipper tape  124 A can be attached to the mattress cover  106  at the mattress bottom  110  and the zipper tape  124 B can be attached to the platform  114  of the foundation  104  at the foundation top  118 . For example, the zipper tape  124 A can be sewn to an underside of the cover  106  and the zipper tape  124 B can be sewn to a fabric on a top of the foundation  104 . In other embodiments, the zipper tape  124 A can be attached to the mattress  102  by other suitable mechanisms. In addition or alternatively, the zipper  122  can be arranged at a head side and/or a foot side of the mattress  102 . For example, the zipper  122  can extend substantially a full length of the head side and/or the foot side of the mattress  102 . 
     In other embodiments, the zipper  122  extends at a length shorter than the full length of the mattress  102 . Further, in other embodiments, the mattress  102  can be coupled to the foundation  104  by a single, continuous zipper. 
     The zipper  122  can be configured to attach the mattress  102  to the foundation  104  and to hold the mattress  102  in place on the foundation  104 . In embodiments in which the foundation  104  is an adjustable foundation, the zipper  122  can retain the mattress  102  in place when the foundation  104  raises and/or lowers one or more panels of the platform  114 , which further raises and/or lowers one or more portions of the mattress  102 . Moreover, in such embodiments, the zipper  122  can extend substantially a full length, from a location near the head end of the mattress  102  to a location near the foot end of the mattress  102 , across one or more articulation points of the mattress  102  and the foundation  104 . Portions of the mattress  102  and the foundation  104  that bend during actuation can be considered articulation points. For example, in embodiments when the platform  114  of the foundation has multiple panels, a joint between two adjacent panels can be considered an articulation point. Therefore, the zipper  122  can be able to retain the mattress  102  to the foundation  104  when the foundation  104  is actuated and one or more portions of the mattress  102  are raised and/or lowered in response to one or more panels of the platform  114  being raised and/or lowered. 
     In some embodiments, the zipper  122  can be hidden from sight. As a result, additional covers and/or fabric may not be required to hide the zipper  122  from sight. The zipper  122  can be arranged and sewn into the seam  107  of the mattress  102  such that the zipper  122  is not visible. When the zipper  122  is sewn into the seam  107 , the zipper  122  can take advantage of strength already existing in the seam  107 . Therefore, the zipper  122  can be less likely to come undone or break when retaining the mattress  102  to the foundation  104 . This can be especially advantageous when the foundation  104  is adjustable and one or more panels of the platform  114  and one or more portions of the mattress  102  are raised and/or lowered. 
       FIG.  2 A  is a top view of the foundation  104 . As shown in  FIG.  2 A , the foundation  104  has the foundation platform  114  (which at least partially defines the foundation top  118 ), and the zippers  122  that include zipper tapes  124 B and  124 D. Each zipper tape  124 B and  124 D have zipper teeth  126 B and  126 D, respectively. The teeth  126 B and  126 D are configured to couple with the zipper teeth of the zipper tapes attached to the bottom of the mattress  102  (e.g., as shown in  FIG.  2 B ) and therefore retain the mattress  102  to the foundation  104 . The foundation  104  can further have a foundation cover  119  with one or more fabric portions at least partially covering the platform  114 . Fabric portions of the foundation cover  119  can meet at one or more seams  142 . The seams  142  can extend along an entire perimeter of the foundation top  118  (refer to  FIG.  1   , foundation perimeter  120 ). In some embodiments, the zipper tapes  124 B and  124 D can attach to the foundation top  118  at the seam  142 , interior to the perimeter of the foundation  104 . As a result, the zipper tapes  124 B and  124 D can take advantage of the strength of the existing seam  142  when the teeth  126 B and  126 D are coupled with the teeth of the zipper tapes attached to the mattress  102 . In addition, the zipper  122  can be hidden from sight when the mattress  102  is coupled to the foundation  104 . This is possible when the zipper tapes  124 B and  124 D are attached (i.e. sewn) interior to the perimeter of the foundation  104  and/or when the zipper tapes  124 B and  124 D are attached (i.e., sewn) into the seam  142 . 
     In other embodiments, the seams  142  can extend along a portion of the perimeter of the foundation top  118 . The zippers can attach to the foundation top  118  at the seams  142  as described above. In addition or alternatively, the zippers can extend along a portion of the foundation top  118  that has no seam. 
     In other embodiments, the zippers  122  need not be attached at seams. For example, in some embodiments the zippers  122  can be sewn to fabric at a location that does not include a seam. In other embodiments, the foundation cover  119  can be omitted and the zippers  122  can be attached to the foundation  104  via other suitable mechanisms, such as screws, bolts, rivets, or adhesive. 
     In some embodiments, the foundation  104  can define multiple passages  121 A-B that extend through the foundation top  118 . The passages  121 A-B can be configured to allow passage of one or more hoses (not shown) through the foundation  104  and into the mattress  102 . The passages  121 A-B can be useful, for example, in embodiments where the mattress  102  is fluidically connected to an air source (not shown) in or under the foundation  104 . 
     In some embodiments, the foundation  104  can be an adjustable foundation and the platform  114  can include multiple panels  128 A- 128 D, including a head panel  128 A, a middle panel  128 B, a leg panel  128 C, and a foot panel  128 D. Each of the panels  128 A-D can be moved when the adjustable foundation is actuated. When each of the panels  128 A-D are moved, one or more portions of the mattress  102  attached to the foundation  104  by the zipper  122  can also be moved accordingly. For example, if the head panel  128 A of the platform  114  is raised, the mattress  102  is raised as well at a head portion of the mattress  102 , and the mattress  102  remains coupled to the foundation  104  by the zipper  122 . 
     The foundation  104  can include an actuator (not shown) operably connected to each of the panels  128 A-D of the platform  114  so as to actuate one or more of the panels  128 A-D between raised and lowered positions in response to actuation by the actuator and a controller  150  operably connected to the actuator and configured to electronically drive the actuator to actuate one or more of the panels  128 A-D between raised and lowered positions. In some embodiments, the one or more panels  128 A-D can be actuated manually by the user with or without the controller  150 . In other embodiments, the one or more panels  128 A-D can be actuated automatically by the controller  150 . The controller  150  can be configured to raise and/or lower one or more of the panels  128 A-D from a predetermined minimum height to a predetermined maximum height. For example, using the controller  150 , the user can raise the head panel  128 A to a maximum height position while lowering the foot panel  128 D to a minimum height position. Each of the panels  128 A-D can be adjusted to a same height such that the user lays flat on top of the mattress  102 . 
       FIG.  2 B  is a bottom view of the mattress  102 . As shown in  FIG.  2 B , the mattress  102  includes the mattress bottom  110 , the mattress cover  106 , and the zippers  122 . The zippers  122  further includes zipper tapes  124 A and  124 C which connect to zipper teeth  126 A and  126 C, respectively. The zipper teeth  126 A and  126 C are configured to couple with corresponding zipper teeth of the zipper tapes attached to the foundation  104  (shown in  FIG.  2 A ) and therefore retain the mattress  102  to the foundation  104 . In some embodiments, the zipper tapes  124 A and  124 C can attach to the mattress bottom  110  at one or more of the seams  107  interior to a perimeter of the mattress  102 . As a result, the zipper tapes  124 A and  124 C can take advantage of the strength of the existing seam  107  when the teeth  126 A and  126 D are coupled with the teeth and the zipper tapes attached to the foundation  104 . In addition, the zipper  122  can be hidden from sight when the mattress  102  is coupled to the foundation  104 . This is possible when the zipper tapes  124 A and  124 C are attached (i.e. sewn) interior to the perimeter of the mattress  102 , such as when the zipper tapes  124 A and  124 C are attached (i.e., sewn) into the seam  107 . 
       FIG.  3    is a side view of the foundation  104  and the mattress  102  when the foundation  104  is an adjustable foundation. The foundation  104  can be actuated manually, by the user, and/or automatically by the controller, as previously described (refer to  FIG.  2 A ). The mattress  102  is enclosed in the mattress cover  106  and the platform  114  of the foundation  104  is enclosed (i.e., covered) in the foundation cover  144 , as previously described. The zipper  122  extends from a position near the head end of the mattress  102  to a position near the food end of the mattress  102  and couples and retains the mattress  102  to the platform  114  when the foundation  104  is actuated. As a result, the zipper  122  extends over one or more articulation points of the foundation  104  and the mattress  102 . In some embodiments, a zipper tape of the zipper  122  is attached to a bottom of the cover  106  and another zipper tape of the zipper  122  is attached to a top of the foundation cover  144 . 
     The mattress bottom  110  is raised when the head panel  128 A of the platform  114  (refer to  FIG.  2 A ) is actuated/raised by the controller  150 . As a result, the head portion of the mattress  102  is also raised. As previously discussed, when the foundation  104  is an adjustable foundation and it is actuated, the mattress  102  remains coupled to the foundation  104  as one or more panels  128 A-D of the platform  114  of the foundation  104  are raised and/or lowered, thereby raising and/or lowering the associated portions of the mattress  102 . 
     In some embodiments, the zipper tape  124 A can be attached directly to the mattress  102  (e.g. sewn to the mattress cover of the mattress  102 ) and the zipper tape  124 B can be attached directly to the foundation  104  (e.g. to a cover of the foundation  104 ) without additional lengths of extension fabric in-between. In such embodiments, the zipper  122  can provide a relatively tight connection between the mattress and the foundation. For example, in embodiments where the zipper tapes  124 A and  124 B have a width of between about 1 and about 2 inches, then the zipper  122  can hold the mattress  102  to the foundation  104  with a gap of about 1 to about 2 inches. In other embodiments, the zipper tapes  124 A and  124 B can be narrower or wider for applications where tighter or looser connections are deemed desirable. In still other embodiments, one or more portions of fabric can be added as an extension where looser connections between the mattress  102  and the foundation  104  are deemed desirable. 
     In some embodiments, the zipper  122  can be spaced inward from a perimeter of the mattress  102  and the foundation  104  by an amount suitable to substantially conceal the zipper  122  from view and suitable to allow for sheets to be tucked in between the mattress  102  and the foundation  104 . For example, the zipper  122  can be spaced inward from a perimeter of the mattress  102  and the foundation  104  by between about 2 and about 4 inches. 
     In some embodiments, the bed system  100  can include exactly two zippers  122  that connect the mattress  102  to the foundation  104 . For example, a first zipper  122  can extend longitudinally along a left side of the bed system and a second zipper  122  can extend along a right side of the bed system. 
     In some embodiments, the bed system  100  can include exactly one zipper  122  that connects the mattress  102  to the foundation  104 . For example, the zipper  122  can follow a full (or nearly full) loop whereby the zipper  122  extends along a top portion, a left side, a bottom portion, and a right side of the bed system  100 . In one example, the zipper  122  can extend along a left side of the bed system  100 , turn and extend along a foot side of the bed system  100 , turn and extend along a right side of the bed system  100 , and turn and extend along a top side of the bed system  100 . In some embodiments with a single zipper  122  connecting the mattress  102  to the foundation  104 , the zipper  122  can be positioned under the mattress  102  at a location inward of the perimeter of the mattress so as to have a gap between the perimeter of the mattress  102  and the zipper  122 . 
     In some embodiments, the bed system  100  can have more than two zippers  122  that connect the mattress  102  to the foundation  104 . 
       FIG.  4    is a schematic view of the bed system  100  when viewed from the head end. As shown in  FIG.  4   , the foundation  104  can include the legs  116  and the platform  114 . In some embodiments, the foundation  104  is an adjustable foundation (refer to  FIG.  3   ), wherein one or more panels  128 A-D of the platform  114  can be adjusted to a raised or lowered height (refer to  FIG.  2 A ). The platform  114  can be made from wood, such as medium density fiberboard or plywood, and covered in a fabric, as previously described throughout this disclosure. 
     The mattress  102  can be placed on top of the platform  114  of the foundation  104 . 
     In some embodiments, the mattress  102  can include one or more air chambers  130  and one or more foam portions  132  covered in the mattress cover  106 . The air chamber  130  can be an inflatable air chamber filled with air to provide support to one or more portions of the mattress  102 . The amount of air in the air chamber can be adjusted by using an air controller having a pump or blower. As a result, fluid pressure in the air chamber  130  can be customized to change the firmness and/or support of the mattress  102 . In some embodiments, the air chamber  130  can extend a full length of the mattress  102 , from the head end to the foot end of the mattress  102 . In other embodiments, the air chamber  130  can be placed in a particular portion of the mattress  102  (i.e., only at the head end and/or only at the foot end of the mattress  102 ). In yet other embodiments, multiple air chambers can be placed within the mattress  102  and each air chamber can be individually controlled/manipulated by the controller. In alternative embodiments, the air chamber  130  can be replaced with another type of mattress core suitable for the application. 
     The air chamber  130  can be surrounded on one or more sides by one or more foam members  134 . For example, in some embodiments the foam members  134  can include a top foam member  134  and a number of side foam members  134  that combine to form an upside down foam tub  132  that can be placed on top of the air chamber  130  within the mattress  102 . In other embodiments, the mattress  102  can have one or more foam members that are sized, shaped, and positioned differently than as illustrated in  FIG.  4   , or can have no foam members. In some embodiments, the mattress  102  can include one or more foam members  134  without the air chamber  130 . For example, the air chamber  130  can be replaced with a mattress core that includes foam, springs, and/or other suitable materials. 
     The air chamber  130  can be formed of a layer of polymer material configured to substantially retain air and a layer of fabric configured to provide reinforcing strength. In some embodiments, such a combination of materials can be advantageous in making the air chamber  130  durable and substantially airtight. As a result, the combination of materials can substantially retain air within the air chamber  130  when weight is added on top of the mattress  102  and/or the mattress  102  is bent and/or articulated when the adjustable foundation is actuated. 
     Still referring to  FIG.  4   , a bottom of the air chamber  130  can be attached to the mattress cover  106  by a zipper  123 . In some embodiments, the zipper  123  can extend substantially a full length of the air chamber  130  and/or the mattress  102 . In other words, the zipper  123  can extend from a head end of the air chamber  130  to a foot end of the air chamber  130 . In such embodiments, the zipper  123  can be sewn into (i.e., along) a seam of the air chamber  130 . Therefore, the zipper  123  can take advantage of the existing strength in the seam of the air chamber  130  such that the zipper  123  does not become undone or break when the zipper  123  retains the air chamber  130  to the mattress  102 . In some embodiments, the zipper  123  can be attached at one or more corners of the air chamber  130  such that the zipper  123  can take advantage of the strength of an existing seam along the one or more corners of the air chamber  130 . 
     In addition to the zipper  123  connecting the air chamber  130  to the mattress cover  106 , the zipper  122  can further connect the mattress cover  106  to the foundation  104 . The zipper  122  can couple the mattress  102 , via the cover  106 , to the foundation  104 . The zipper  123  can be arranged adjacent the zipper  122  (i.e., vertically aligned) such that both zippers  122  and  128  act together to form a relatively strong connection between the air chamber  130  and the foundation  104 . Moreover, if the zippers  122  and  128  are aligned along seams of the air chamber  130 , the mattress cover  106 , and the foundation  104 , the zippers  122  and  128  can take advantage of the existing strength from the seams. As a result, the connection between the mattress  102  and the foundation  104  can be relatively strong, especially where the foundation  104  is an adjustable foundation and the foundation  104  is actuated. 
     In some embodiments, the air chamber  130  can be omitted. For example, the mattress  102  can include a mattress core (that does not necessarily have any air chambers) inside the mattress cover  106 . One or more zippers  128  can connect the mattress core to the mattress cover  106  and one or more zippers  122  can connect the mattress cover  106  to the foundation  104 . Accordingly, a combination of one or more zippers  128  inside the mattress  102  and one or more zippers  122  outside of the mattress  102  can function to retain a mattress core (with our without an air chamber) in position on an adjustable foundation. 
       FIG.  5   s    a schematic elevation view of a portion of the bed system  100  in one embodiment, showing a portion of the zippers  122  and  128 . The bed system  100  includes the foundation  104  and the mattress  102  (including the mattress cover  106  and the air chamber  130 ). In this example, the first zipper  122  connects (i.e., couples) the mattress cover  106  to the top  118  of the foundation  104  at the platform  114 . The zipper tape  124 A can connect the zipper teeth  126 A to the mattress  102  (such as by being sewn along a seam, in some embodiments). The zipper tape  124 B can connect the zipper teeth  126 B to the top  118  of the foundation  104  at the platform  114  (such as by being sewn along a seam, in some embodiments). When the zipper  122  is zipped, the zipper teeth  126 A can be connected to the zipper teeth  126 B such that the zipper  122  can connect the mattress  102 , via the mattress cover  106 , to the top  118  of the foundation  104  at the platform  114 . In other words, when zipper teeth  126 A and zipper teeth  126 B are coupled, the zipper  122  can securely attach the mattress  102  to the foundation  104 . 
     In some embodiments, a second zipper, the zipper  123 , can be used to retain the air chamber  130  (or another mattress core that does not necessarily include an air chamber). For example, the zipper  123  can connect an exterior underside (i.e., bottom) of the air chamber  130  to an interior portion of the mattress cover  106 . The zipper  123  can include zipper tapes  136 A and  136 B that connect to corresponding zipper teeth  138 A and  138 B. The zipper tape  136 A can connect the zipper teeth  138 A to the mattress air chamber  130  (such as by being sewn to a bottom portion of the air chamber  130 , in some embodiments). The zipper tape  136 B can connect the zipper teeth  138 B to the mattress cover  106  (such as by being sewn along a seam, in some embodiments). When the zipper  123  is zipped, the zipper teeth  138 A can be connected to the zipper teeth  138 B such that the zipper  123  can connect the air chamber  130  to the mattress cover  106 . 
     This configuration of the zippers  122  and  128  can be beneficial in embodiments where the foundation  104  is an adjustable foundation. When the foundation  104  is actuated and one or more panels  128 A-D comprising the platform  114  of the foundation  104  are raised and/or lowered, the one or more portions of the mattress  102  and one or more corresponding portions of the air chamber  130  move accordingly. For example, if the head panel  128 A of the platform  114  is raised, then the corresponding portion of the mattress  102  is raised, as well as any part of the air chamber  130  that is located in that corresponding portion. 
       FIG.  6    is a schematic view of the bed system  200  when viewed from the head end. The bed system  200  is similar to the bed system  100  (shown in  FIGS.  1 - 5   ) except that the bed system  200  has a different zipper configuration. The bed system  200  includes zippers  202  extending from the air chamber  130  to the platform  114  of the foundation  104 . The zippers  202  can each include first and second zipper tapes  204  and  206 , with the zipper tape  204  connected to the air chamber  130  and the zipper tape  206  connected to the foundation  104 . The zipper tapes  204  and  206  can be zipped together in order to connect the air chamber  130  to the foundation  104  and hold the air chamber  130  in place on the foundation  104 , such as during actuation of the foundation  104 . 
     In some embodiments, the mattress cover  106  can define holes through which the zippers  202  extend between the air chamber  130  and the foundation  104 . This can allow the zippers  202  to connect the air chamber  130  directly to the foundation  104  without additional intervening zippers. For example, the zipper  202  can extend a full distance between the air chamber  130  and the foundation  104  as opposed to using two zippers to span the same distance, such as shown in  FIGS.  4  and  5   . 
     A number of embodiments of the invention have been described. Nevertheless, it will be understood that various modifications may be made without departing from the spirit and scope of the invention. For example, the shape, size, and location of various components of the mattress, foundation, and zipper can be modified as suitable for the application. Similarly, one or more features present on one or more of the various embodiments can be considered optional, and need not necessarily be included in all embodiments. Accordingly, other embodiments are within the scope of the following claims.