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Publication numberUS20060123548 A1
Publication typeApplication
Application numberUS 11/013,068
Publication dateJun 15, 2006
Filing dateDec 14, 2004
Priority dateDec 14, 2004
Publication number013068, 11013068, US 2006/0123548 A1, US 2006/123548 A1, US 20060123548 A1, US 20060123548A1, US 2006123548 A1, US 2006123548A1, US-A1-20060123548, US-A1-2006123548, US2006/0123548A1, US2006/123548A1, US20060123548 A1, US20060123548A1, US2006123548 A1, US2006123548A1
InventorsClifton Heath
Original AssigneeHeath Clifton C
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Automatically configured hydraulic support pillow
US 20060123548 A1
Abstract
A pillow providing automatic adjustment of exterior dimensions to accommodate the shape and weight of the head of a user placed upon it. The pillow employs at least one reservoir chamber which provides liquid to at least one communicating receiving chamber through a conduit therebetween. Flow of the fluid is regulated to flow in one direction until the two chambers equalize and provide the desired head support dimensional characteristics to the user.
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Claims(24)
1. A pillow comprising:
a covering layer defining an exterior surface of a pillow and an interior cavity of said pillow;
said pillow having at least one reservoir chamber defined by a reservoir sidewall, housed in said interior cavity;
said pillow having at least one receiving chamber housed in said cavity;
a conduit communicating between said reservoir chamber and said receiving chamber thereby providing a flowpath for fluid therebetween;
means to prevent flow of said fluid from said receiving cavity to said reservoir cavity;
said reservoir chamber being compressible by a human head to thereby force fluid container therein into said receiving chamber;
said receiving chamber formed of a sidewall defining an interior cavity having a total volume;
said sidewall being elastic to thereby provide a means to increase in size to increase said total volume of said interior cavity of said receiving chamber to accommodate said fluid received from said reservoir chamber;
said exterior surface of said pillow adjacent to said receiving chamber increasing in size in direct proportion to any increase in said total volume of said interior cavity of said receiving chamber; and
whereby the head of a user contacting said reservoir chamber imparting force upon said reservoir chamber will cause said receiving chamber to enlarge thereby dimensioning said exterior surface to a shape similar to the shape of said head.
2. The pillow of claim 1 additionally comprising:
means to prevent fluid flow from said receiving chamber back into said reservoir chamber.
3. The pillow of claim 1 further comprising:
said reservoir sidewall being formed of elastic material to thereby increase and decrease the size of said reservoir chamber in proportion to the amount of said fluid remaining in said reservoir chamber.
4. The pillow of claim 2 further comprising:
said reservoir sidewall being formed of elastic material to thereby increase and decrease the size of said reservoir chamber in proportion to the amount of said fluid remaining in said reservoir chamber.
5. The pillow of claim 1 further comprising:
means to override said means to prevent flow of said fluid from said receiving cavity to said reservoir cavity and thereby allow said fluid to flow from said receiving chamber to said reservoir chamber; and
said means to override being user activateable from the exterior of said covering layer.
6. The pillow of claim 2 further comprising:
means to override said means to prevent flow of said fluid from said receiving cavity to said reservoir cavity and thereby allow said fluid to flow from said receiving chamber to said reservoir chamber; and
said means to override being user activateable from the exterior of said covering layer.
7. The pillow of claim 3 further comprising:
means to override said means to prevent flow of said fluid from said receiving cavity to said reservoir cavity and thereby allow said fluid to flow from said receiving chamber to said reservoir chamber; and
said means to override being user activateable from the exterior of said covering layer.
8. The pillow of claim 4 further comprising:
means to override said means to prevent flow of said fluid from said receiving cavity to said reservoir cavity and thereby allow said fluid to flow from said receiving chamber to said reservoir chamber; and
said means to override being user activateable from the exterior of said covering layer.
9. The pillow of claim 1 further comprising:
said fluid being a gel.
10. The pillow of claim 2 further comprising:
said fluid being a gel.
11. The pillow of claim 3 further comprising:
said fluid being a gel.
12. The pillow of claim 4 further comprising:
said fluid being a gel.
13. The pillow of claim 1 further comprising:
said fluid being a gel.
14. The pillow of claim 1 further comprising:
said reservoir chamber being smaller than said receiving chamber; and
means for mechanical advantage to lift said head provided by said receiving chamber when receiving said fluid communicated from said reservoir chamber.
15. The pillow of claim 2 further comprising:
said reservoir chamber being smaller than said receiving chamber; and
means for mechanical advantage to lift said head provided by said receiving chamber when receiving said fluid communicated from said reservoir chamber.
16. The pillow of claim 1 further comprising:
said pillow bing self adjusting to the to a cooperative shape similar to the dimensions of the head of said user placed upon it;
said self adjustment provided by equalization of fluid pressure in said receiving chamber to that of said reservoir chamber when said covering layer contacts said head of said user thereby ceasing flow from said reservoir chamber to said receiving chamber.
17. The pillow of claim 2 further comprising:
said pillow bing self adjusting to the to a cooperative shape similar to the dimensions of the head of said user placed upon it;
said self adjustment provided by equalization of fluid pressure in said receiving chamber to that of said reservoir chamber when said covering layer contacts said head of said user thereby ceasing flow from said reservoir chamber to said receiving chamber; and
said cooperative shape being maintained when said head is removed from said covering layer by said means to prevent fluid flow from said receiving chamber back into said reservoir chamber.
18. The pillow of claim 3 further comprising:
said pillow bing self adjusting to the to a cooperative shape similar to the dimensions of the head of said user placed upon it; and
said self adjustment provided by equalization of fluid pressure in said receiving chamber to that of said reservoir chamber when said covering layer contacts said head of said user thereby ceasing flow from said reservoir chamber to said receiving chamber.
19. The pillow of claim 4 further comprising:
said pillow bing self adjusting to the to a cooperative shape similar to the dimensions of the head of said user placed upon it;
said self adjustment provided by equalization of fluid pressure in said receiving chamber to that of said reservoir chamber when said covering layer contacts said head of said user thereby ceasing flow from said reservoir chamber to said receiving chamber; and
said cooperative shape being maintained when said head is removed from said covering layer by said means to prevent fluid flow from said receiving chamber back into said reservoir chamber.
20. The pillow of claim 1 further comprising:
a plurality of said reservoir chambers each communicating with a separate respective said receiving chamber in a plurality of said receiving chambers.
21. The pillow of claim 2 further comprising:
a plurality of said reservoir chambers each communicating with a separate respective said receiving chamber in a plurality of said receiving chambers.
22. The pillow of claim 2 further comprising:
a plurality of said reservoir chambers each communicating with a separate respective said receiving chamber in a plurality of said receiving chambers.
23. The pillow of claim 1 further comprising:
one or a combination of padding materials from a group of padding materials consisting of foam, batting, down, and feathers, also held in said interior cavity of said pillow.
24. The pillow of claim 2 further comprising:
one or a combination of padding materials from a group of padding materials consisting of foam, batting, down, and feathers, also held in said interior cavity of said pillow
Description
    BACKGROUND OF THE INVENTION
  • [0001]
    1. Field of the Invention
  • [0002]
    The present invention relates to but is not limited to the field of pillows, cushions, mattresses and other reclinatory furniture devices of any type attached or otherwise utilizing a centrally placed, variably flexible, valved, single or multi-chambered, liquid-filled, hydraulically activated and valvically controlled method for support of the head or body. Devices such as those described herein are intended primarily for use during periods of travel, relaxation, reconstitution and rehabilitation and for potential orthopedic enhancements therein.
  • [0003]
    2. Prior Art
  • [0004]
    There is a substantial amount of prior art relating to the field of ergonomic, orthopaedic and other types of cranial, cervical and general physical support devices for the human body. Generally speaking, the historical intent and direction of these efforts is to provide support for the head, neck and spine which simulates the optimal position attainable when the person is standing or sitting during waking hours. Many of these devices are formed from types of enclosed plastic foams. Others are essentially ergonomically shaped containers of grain or sand. Most if not all of this type are by nature asymmetrically shaped, having a lower portion that is thicker for neck support. Such pillows also have an upper portion that is thinner for support of the head and necessarily represented as possessing a definable top surface portion and a definable bottom surface portion. Other theorists have used an approach involving various gas and/or liquid filled bladders and often providing some user initiated and directed capability for affecting the overall firmness of the device.
  • [0005]
    Some previously proposed configurations combine many or all of these qualities at once with more or less success. As shall be demonstrated in detail below, all of the noted approaches suffer from one or another of these shortfalls which detracts from the efficacy of a device of the type as is herein described.
  • [0006]
    U.S. Pat. No. 5,708,999 filed Jan. 20, 1998, describes a support pillow composed of a top portion surfaced by a bolster covering shaped as previously indicated and a bottom portion described as an inflatable under-pillow composed of a plurality of parallel rows of fluidly communicating air chambers interconnected with one another through means of headers. A nozzle connecting a header to an air source could be utilized by the user to alter the pressure in the entire body of the chambers in order to raise or lower the height at which the top portion rests.
  • [0007]
    As can be seen, the basic shape of the device described by this patent is the key impediment against general implementation. This is because use of the device requires it to be in only one position which is an ergonomically shaped bolster component on the top with the inflatable header-chamber support component lying below it. While the inflatable component allows control of the setting of the height of the neck and head support functions of the bolster component and is a key intent of the design, it creates a problem with utilization of the device other than as designed for top surface over bottom surface configuration. The result is a device that cannot be used upside down and still provide the expected benefits. In addition, there is no method for altering the firmness of the bolster component.
  • [0008]
    As can be imagined, both the fixed usage position attribute and the fixed firmness of the bolster can be a distraction at the least and an annoyance at best since one is restricted to such positions and resultant comfort levels as are allowed by the design.
  • [0009]
    U.S. Pat. No. 5,771,514 filed on Jun. 30, 1998, envisioned as an adjustable contour pillow addresses the second issue of the firmness of the head to pillow interface, but like all of the contour pillows identified it leaves the primary issue of asymmetrical or bottom over top use unresolved as it has a defined top surface and bottom surface. In this concept multiple, individually adjustable, inflatable, internal chambers utilize air or some other fluid and an externally induced means of compressing this fluid to provide variable levels of firmness and support in the top laterally oriented chambers of the device such as those beneath the head and neck.
  • [0010]
    In one embodiment, the device is additionally proposed to incorporate heating, cooling and massage mechanisms, to store user preferences and other capabilities through means of an attached or detachable motor, control box and AC electrical connections or batteries.
  • [0011]
    Portability of this configuration of the device for the elderly or impaired, even if powered by batteries, is severely impacted as a result of this electrical requirement, and this would reduce opportunities for use in areas where electrical connections are inconvenient or unavailable. Previously noted shortfalls of this conception are present in this exemplification as well.
  • [0012]
    U.S. Pat. No. 6,397,415, an inflatable cervical pillow formed of an airtight and watertight thermoplastic material comprises an association of variably shaped water chambers including valves and interlocking air chambers including valves, flexibly fitted with one another such that pressure upon the surface of the device, using the physical interaction between the different chambers resulting from the differing densities of air and fluids, effects changes in the firmness and support vectors provided to the head.
  • [0013]
    This invention provides the necessary variable firmness and support of the head by exploiting the differing densities and resultant interactions of gases and fluids, sometimes in combination, within separate, pressurized, interrelated contained spaces.
  • [0014]
    An obvious drawback to an innovation of this type is, of course, the manufacturing complexity of a design in which multiple chambers containing different substances must interact, interface, remain integral, and which require optimal positioning with one another during use. Additionally, as specified in the various provided drawings and verbiage, this device also has a shape incorporating an identifiable top surface and a bottom surface and an identifiable front end and rear end. As a result, in addition to issues of comfort, the internal valving mechanisms used to alter firmness based on pressure differentials cannot function if the device were to be inverted. This fixed position usage problem has been a significant shortfall present in all previous designs of this type seen and noted.
  • [0015]
    U.S. patent application publication No. US 2002/0078507 identifies a pillow including a plurality of variably inflatable bladders surrounded by a resilient layer, that layer potentially being further surrounded by a less dense resilient layer and optionally provided with an integral hand pump for inflation purposes.
  • [0016]
    This approach is primarily intended to resolve one recurring problem with other concepts including that of the inability of previous designs to consider two sided use.
  • [0017]
    The physical attributes of the device can be described as symmetrical with respect to one axis so that the device may be turned over and used on both sides. When not inflated and viewed from above or below, the shape could be described as a rectangle. When viewed uninflated from either side, a similar rectangle would be perceived. Subsequent to inflation of this device, a top or bottom view still exemplifies a rectangular shape.
  • [0018]
    A perspective side view of this concept in an inflated condition would, however, convey an image of two parallel cylindrical channels with an identifiable larger elongated lower cylinder on one edge for the support of the neck and an identifiable elongated smaller upper cylinder for support of the head on the other edge, each laterally extended across the device. A method of selectively modifying pressure within each chamber is provided via reticulation of an integral pump and valve assembly similar to that found in athletic shoes.
  • [0019]
    Though this device resolves the issue of two sided use, it still consists of a designated top edge and a designated bottom edge respectively such that as a result of design it cannot be easily inverted as the cylindrical internal bladders contained therein possess significantly different internal diameters. Additionally, changes to the firmness of the bladders require manual reticulation of the air chamber pressurizing valve.
  • SUMMARY OF THE INVENTION
  • [0020]
    Based on the hydraulic effect of Pascal's Principle that an enclosed fluid under pressure exerts that pressure throughout its volume and against any surface in which it is contained, the device herein disclosed is a multi-chambered hydraulic pillow using differently shaped and sized, variably elastic internal chambers combined with a plurality of internal valves which automatically control, communicate, balance and contain the flows of the liquid and differences in pressure and resulting changes in the external dimensions provided by the changes in the variably elastic flexible chambers.
  • [0021]
    The basis for all hydraulic systems is expressed by Pascal's law which states that anywhere upon an enclosed liquid is transmitted undiminished in all directions to the interior of the container. This principal allows large forces to be generated with relatively little effort. In the case of the device herein, the force generated in a second chamber by the projecting portion of the top of the user's head will communicate liquid therefrom into a first chamber through a back flow control valve. The first chamber upon filling will exert force on the back of the head and neck of the user and will cease accepting fluid from the smaller chamber once the pressure in the two equalize.
  • [0022]
    Since the second chamber of the pillow will collapse from the weight and area of the projecting top end displacing fluid, the first chamber will enlarge to fill the voids of the back of the head and neck, below the top of the head. As depicted in all the current favored embodiments, the second chamber is smaller than the first chamber, and this configuration worked well due to the dimensional characteristics of the back of the human head. However, the relative size of the two chambers could be reversed or equal and they still adjust. This operation is initiated by simply laying one's head on the pillow and automatically provides optimal comfort and conforming support for the neck, head or other extremities using only the pressure generated on the surface of the device by the mass of a user's head. To accomplish this task both chambers of the device are best filled with water or some other liquid or a gel. In the case of a gel, such a medium would minimize any potential noise from air gaps in the system as well as minimize movement of the head. Both chambers should also be elastic such that they will shrink as fluid leaves the chamber and enlarge with the entry of more fluid and avoid air pockets. However, the smaller chamber could be flexible plastic since the walls would only need to collapse in use as fluid is pumped into the larger chamber.
  • [0023]
    With respect to the above description, before explaining at least one preferred embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and to the arrangement of the components or steps set forth in the following description or illustrated in the drawings. The various apparatuses and methods of the invention are capable of other embodiments and of being practiced and carried out in various ways which will be obvious to those skilled in the art once they review this disclosure. Also, it is to be understood that the phraseology and terminology employed herein are for the purpose of description and should not be regarded as limiting.
  • [0024]
    As such, those skilled in the art will appreciate that the conception upon which this disclosure is based may readily be utilized as a basis for designing of other devices, methods and systems for carrying out the several purposes of the present disclosed device. It is important, therefore, that the objects and claims be regarded as including such equivalent construction and methodology insofar as they do not depart from the spirit and scope of the present invention.
  • [0025]
    Further objectives of this invention will be brought out in the following part of the specification wherein detailed description is for the purpose of fully disclosing the invention without placing limitations thereon.
  • BRIEF DESCRIPTION OF DRAWING FIGURES
  • [0026]
    FIG. 1 is a perspective view of the top surface of the hydraulic pillow according to the invention showing the exterior cover.
  • [0027]
    FIGS. 2A and 2B are top and side cross-sectional views of an embodiment of the hydraulic pillow according to the invention showing multiple chambers in a static state.
  • [0028]
    FIGS. 3A and 3B show the chambers of FIGS. 2 a and 2 b respectively in a compressed state.
  • [0029]
    FIG. 4A is a cross-sectional view of the hydraulic pillow engaging the back of the head, the neck, and the topmost spine of the user.
  • [0030]
    FIG. 4B is a vector diagram showing the force vectors of the hydraulic pillow when in use.
  • [0031]
    FIG. 5 depicts an embodiment of the device with multiple communicating reservoir and receding chambers.
  • DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE DISCLOSED DEVICE
  • [0032]
    Referring now to the drawings, FIGS. 1-5 disclose the preferred embodiments of the herein disclosed pillow device 10. FIG. 1 depicts a preferred embodiment of the operating concept of the valved hydraulic support pillow device 10 of the invention which is described as composed of multiple self-contained fluid or gas filled elastic chambers, as shown in FIG. 2A, including first chamber 12 and a second chamber 14. The two chambers communicate with each other through a conduit 17 which also employs a means to control fluid flow direction from the second chamber 14 only toward the first chamber 12, which in this case is a valve 16 allowing fluid flow only in one direction toward first chamber 12 when in contact with a person's head 22 and internal pressures of the two chambers are not equalized. As shown in FIG. 1, there is an example, in this case asymmetrical, of a preferred embodiment of the device 10 as viewed from above and from the outside as it would appear once the user had self-adjusted the device by lying down to move fluid between the chambers until the internal pressure equalized.
  • [0033]
    FIG. 2A depicts a cut-away view of a preferred embodiment of the hydraulic pillow device 10 showing the internal chambers in a static or uncompressed state and from overhead. Both chambers as shown are elongated and cylindrical in dimension as this shape has been found to work well in elongated pillows.
  • [0034]
    As shown, the device features two or more chambers depicted as first chamber 12 which worked best in a configuration where it was larger than a second chamber 14. The larger volume of the first chamber 12 more easily accommodates the void on the back of the head below the projecting top of the head on most persons. Both the first chamber 12 and a second chamber 14 are both made of a flexible elastic material through which a fluid substance 26 can communicate and be stored long term without leakage. Directional control of the fluid flow is provided by the valve mechanism 16 positioned in internal passage of the conduit 17 communicating between the first chamber 12 and second chamber 14.
  • [0035]
    FIG. 2B is a side cross-sectional internal side view of an embodiment of the hydraulic pillow 10 along line 2-2 of FIG. 1 showing the two chambers in the initial static uncompressed state. The first chamber 12 and a depicted smaller second chamber 14, are both formed of a flexible or elastic material capable of containing the fluid without leakages.
  • [0036]
    FIG. 3A depicts the hydraulic pillow device 10 as viewed internally in a state of initial compression which occurs when the user lies their head on top of the device 10 the projecting top end of the user's head, and recessed neck portion of the head, contact the top of the pillow device 10. As shown, a first chamber 12 and a second chamber 14 would be made of a flexible or elastic material to allow for reduction in size of the second chamber 14 and increase in size of the first chamber 12. Arrows describe the effects of Pascal's principle on the inner surfaces of the respective chambers 12 and 14 which result in the ultimate exterior dimensional adjustments of the pillow to the user's head dimensions.
  • [0037]
    In the depicted preferred embodiment's of the device 10, when the user lies their head on the top of the exterior of the device 10, the force generated in the smaller chamber by the weight and dimensions of the projecting portion of the top of the user's head will cause liquid to exit the second chamber 14 and communicate through the conduit 17 and in-line valve 16, and into the first chamber 12. A mechanical advantage for weight lifting and support, from the larger size of the first chamber 12, is believed to be also at work in supporting the user's neck and lower head from the increase in fluid pushed into the first chamber 12 from the second chamber 14. The first chamber 12 upon filling to a point that an even contact is made with the user's head will exert force on the back of the head and neck of the user resulting in an equalization of the pressure between the two chambers and will cease accepting any additional fluid from the second chamber 14 once that pressure equalizes.
  • [0038]
    Because the second chamber 14 of the pillow will collapse from the weight and actual projecting area of the top end of the user's head displacing fluid, the first chamber 12 will then enlarge to fill the voids of the back of the head and neck, below the top of the head. Pillow size and dimension adjustment is caused by simply lying one's head on the pillow and automatically provides optimal comfort and conforming support for the neck, head or other extremities using only the pressure generated on the surface of the device by the mass of a user's head.
  • [0039]
    As noted, the fluid material of choice for both chambers of the device 10 is water or some other inert liquid or a gel. Gel would be especially advantageous because of its ability to minimize noise from air gaps in the system and provide a shock absorber of sorts that thinner water lacks. Both chambers should in the preferred mode of the device be formed like a bladder made of elastic material which will shrink as fluid leaves the respective chamber and enlarge with the entry of more fluid. This avoids noisy air pockets as well as the lack of support caused by air in the system.
  • [0040]
    FIG. 3B is a side cross-sectional internal view of an embodiment of the hydraulic pillow 10 depicting the compressed state of the two chambers in dotted line. As shown, first chamber 12 has compressed in size from its original static position shown in dotted line and the second chamber 14 under the void of the neck has enlarged in size from its original position shown in dotted line. The elastic walls forming both chambers accommodate the dimensional changes of each. Fluid transfer is accommodated from one chamber to the other through the conduit 17 and back flow from the first chamber 12 to the second chamber 14 is prevented by the one way valve 16. This means for back flow preventions also maintains the two chambers in their respective sizes after the adjustment by preventing the elastic walls of the chambers from exerting force into the fluid and moving it back between them. This keeps the pillow permanently adjusted after use. As shown in this figure, arrows describe the effects of Pascal's principle on the bladder like chambers and their respective increase and decrease in dimension.
  • [0041]
    Of course there are times when the pillow needs readjustment for a new person or just because the same person wants a change. This would be accommodated by providing a means to override the valve 16 and allow back flow such as a release 19 shown as a button on the valve 16 which can be activated from the exterior of the device 10, without the need to open it, when the user wants to allow back flow of fluid into the second chamber 14 from the second chamber 12.
  • [0042]
    FIG. 4A is a cross sectional view of the hydraulic pillow device 10 depicting a person's head 22 in a supine position and about to be positioned upon the multiple chambers 12 and 14 and interconnecting valve 16. In reference to FIG. 4B, a side viewed cross section of an embodiment of the invention 10 displays the force vectors resulting from fluid movement between the first chamber 12 and the smaller second chamber 14 when the top outwardly curved section of the user's head compresses the second chamber 14.
  • [0043]
    Finally, it has been found that the optional addition of padding 23 to the voids in the internal cavity formed by the covering 20 can be advantageous. Such padding 23 works especially well if it is memory foam that reacts to the heat of the user and forms to their anatomy. However any one or combination of a variety of padding materials can be included such as foam, batting, down, and feathers. The expansion and contraction of the size of the two chambers will continue to work well with the foam 22 included in the voids between them and in the rest of the cavity defined by the covering 20.
  • [0044]
    Although the invention has been described with respect to particular embodiments thereof, it should be realized that various changes and modifications may be made therein without departing from the spirit and scope of the invention. While the invention as shown in the drawings and described in detail herein discloses arrangements of elements of particular construction and configuration for illustrating preferred embodiments of structure and method of operation of the present invention, it is to be understood, however, that elements of different construction and configuration and other arrangements thereof, other than those illustrated and described, may be employed in accordance with the spirit of this invention. Any and all such changes, alternations and modifications, as would occur to those skilled in the art, are considered to be within the scope of this invention as broadly defined in the appended claims.
  • [0045]
    Further, the purpose of the attached abstract is to enable the U.S. Patent and Trademark Office and the public generally, and especially the scientists, engineers and practitioners in the art who are not familiar with patent or legal terms or phraseology, to determine quickly from a cursory inspection the nature and essence of the technical disclosure of the application. The abstract is neither intended to define the invention of the application, which is measured by the claims, nor is it intended to be limiting as to the scope of the invention in any way.
Patent Citations
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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US8966689 *Mar 14, 2013Mar 3, 2015Select Comfort CorporationMulti-zone fluid chamber and mattress system
US9204731 *Jan 30, 2013Dec 8, 2015Comfort Revolution, LLCBedding products having flexible gel panels
US20080254956 *Apr 16, 2007Oct 16, 2008Purvis Thomas CAbdominal Exercise Device
CN105935231A *Apr 28, 2016Sep 14, 2016深圳国医瑰宝国际生命健康管理实业有限公司曲度枕
Classifications
U.S. Classification5/644, 5/655.5
International ClassificationA47G9/00
Cooperative ClassificationA47G2009/008, A61G7/072, A47G9/10, A61F5/01
European ClassificationA61G7/07H, A61F5/01, A47G9/10