Patent Publication Number: US-2011061166-A1

Title: Pillow cover with neck support

Description:
CROSS REFERENCE OF RELATED APPLICATION 
     This is a Continuation-In-Part application that claims the benefit of priority under 35 U.S.C. §119 to a non-provisional application, application Ser. No. 12/286,623, filed Sep. 30, 2008. 
    
    
     BACKGROUND OF THE PRESENT INVENTION 
     1. Field of Invention 
     The present invention relates to a pillow cover, and more particularly to a pillow cover with neck support, wherein the user is able to use his or her own pillow to incorporate with the pillow cover such that when the user sleeps in a bed by using his or her own pillow for head support in a comfortable way, the neck support of the pillow cover provides a substantial neck support to keep the neck of the user in alignment with the spine while sleeping. 
     2. Description of Related Arts 
     Nowadays, pillows have become indispensable tools of in our lives. They usually used for providing support for the head while sleeping in a bed. A pillow can also be just a decoration such as a throw pillow. It is usually having filler inside made from feathers, synthetic fills, and so on. Through sleeping on the pillow, people can feel very relax and comfortable, and achieve the desired sleeping effect. However, although there are thousands of pillows in market, each pillow stores may only provide a very general style. In other words, people pursue for the pillow which is being smaller for people to carry on with them, more personal style, and more convenient and comfortable for people to use. 
     The traditional pillows usually comprise a pillow cover to cover on top of the pillow. Because the pillow cover is changeable, it provides a way to change the appearance of the pillows and always keeps the pillows clean. Even through constantly and long terms using, the pillows in the pillow covers still remains in good condition. However, when the user wants to adjust the height and the position of the pillow, the present pillow always can only make slightly change. In other words, every pillow user would like to adjust different height and position of their pillows so as to ensure which style fits his or her head the most to achieve the most comfortable way while sleeping in a bed. 
     Therefore, there is a kind of adjustable pillow, called memory pillow sold on the market, comprising memory foam, wherein the memory is made of polyurethane with additional chemicals that increase its viscosity level and density. Thus, when the user sleep on the memory pillow, the memory pillow automatically adjust its height and position to fit the user&#39;s head so as to make people feel more comfortable while sleeping in a bed. However, even though the memory foam pillow is flexible in its shape to fit the user&#39;s head, the memory foam pillow has several drawbacks. The main drawback of the memory foam pillow cannot be selectively adjusted its stiffness. Accordingly, some users may prefer to use the pillow having softer supportive ability. However, such memory foam pillow can only provide a standard softness. In addition, the memory foam pillow is too heavy and bulky. For example, when people go out for traveling, a conventional pillow or such memory pillow which is already making a good adjustment of its shape is not allowable for them to carry on with them. Thus, the user still needs to use the pillow provided by the hotel room. To make matters worse, through constantly and long terms using, some pillows go out of shape very easily such that people will feel not so comfortable while sleeping on it. It is a struggle for people to decide whether to keep the deformed pillow or get a new one. 
     In addition, the existing pillow has a predetermined waved structure to form a neck support for supporting the neck of the user when the head of the user supports on the pillow. However, the neck support of the pillow has a standard size such that the neck support may not fit the neck curvature of the user. In addition, the location of the neck support is fixed that the neck support may not fit the neck position of the user. Therefore, the user will merely change the head position in order to align the neck of the user with the neck support of the pillow. 
     To sum up, the design of existing pillows cannot satisfy the current needs of people who like to have their individual style on pillows and pursue the most comfortable manner while they sleep in a bed. 
     SUMMARY OF THE PRESENT INVENTION 
     The invention is advantageous in that it provides a pillow cover with a neck support, wherein the user is able to use his or her own pillow to incorporate with the pillow cover such that when the user sleeps in a bed by using his or her own pillow for head support in a comfortable way, the neck support of the pillow cover provides a substantial neck support to keep the neck of the user in alignment with the spine while sleeping. 
     Another advantage of the invention is to provide a pillow cover with a neck support, wherein the geographic position of the neck support on the pillow casing is changeable and replaceable. Therefore, every pillow user is able to adjust its geographic position of their pillows so as to ensure which style fits his or her head the most to achieve the most comfortable way while sleeping in a bed. 
     Another advantage of the invention is to provide a pillow cover with a neck support, wherein the size of the pillow cover is extremely portable such that the user is able to always carry them especially in the travel time. In other words, the user is able to carry the pillow cover only and to incorporate with any existing pillow provided by others, such as hotel. 
     Another advantage of the invention is to provide a pillow cover with a neck support, wherein the neck supporting element comprises an inflatable bag and a valve provided thereon for popping the inflatable bag by air inflation. Thus, the volume of the neck supporting element is further reduced by air inflation method, and the pillow has become extremely portable. 
     Additional advantages and features of the invention will become apparent from the description which follows, and may be realized by means of the instrumentalities and combinations particular point out in the appended claims. 
     According to the present invention, the foregoing and other objects and advantages are attained by a pillow cover which comprises: 
     a pillow casing comprising a top layer and a bottom layer overlapping therewith, and defining a pillow cavity between the top and bottom layers for receiving a pillow element in the pillow cavity; and 
     a neck support provided at the pillow casing at a position that the neck support is upwardly protruded from the top layer and is supported by the pillow element, wherein the neck support comprises a retention pocket provided at the top layer and a neck supporting element received in the retention pocket to upwardly and longitudinally protrude from the top layer for filling at a neck curvature of a user to provide a natural neck support for the user when the head of the user supports on the pillow element. 
     Still further objects and advantages will become apparent from a consideration of the ensuing description and drawings. 
     These and other objectives, features, and advantages of the present invention will become apparent from the following detailed description, the accompanying drawings, and the appended claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an exploded perspective view of a pillow cover with a neck support according to a preferred embodiment of the present invention, illustrating the alternatives of the neck supporting element. 
         FIG. 2  is a side view of the pillow receiving in the pillow cover according to the above preferred embodiment of the present invention, illustrating the head and neck support of the user by the pillow and the neck support of the present invention. 
         FIG. 3  is a sectional view of the pillow cover with the neck support incorporating with the traditional pillow according to the above preferred embodiment of the present invention. 
         FIG. 4  illustrates the structural configuration of the pillow cover according to the above preferred embodiment of the present invention. 
         FIG. 5  illustrates an alternative mode of the retention pocket of the pillow cover according to the above preferred embodiment of the present invention. 
         FIG. 5A  illustrates another alternative mode of the pillow cover according to the above preferred embodiment of the present invention. 
         FIG. 6  illustrates an alternative mode of the pillow cover according to the above preferred embodiment of the present invention. 
         FIG. 7  is an exploded perspective view of a pillow cover with a neck support according to a second preferred embodiment of the present invention. 
         FIG. 8  is an exploded perspective view of a pillow cover with a neck support according to a third preferred embodiment of the present invention 
         FIG. 9  is an exploded perspective view of a pillow cover with a neck support according to a fourth preferred embodiment of the present invention 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to  FIGS. 1 to 3  of the drawings, a pillow cover according to a preferred embodiment of the present invention is illustrated, wherein the pillow cover comprises a pillow casing  10  and a neck support  20 . 
     The pillow casing  10  has a top layer  11  and a bottom layer  12  overlapping therewith and defines a pillow cavity  13  between the top and bottom layers  11 ,  12 , wherein a traditional pillow element  1  is adapted to be received in the pillow cavity  13  of the pillow casing  10 . 
     The neck support  20  comprises an elongated retention pocket  21  longitudinally provided at the top layer  11  of the pillow casing  10  and a neck supporting element  22  receiving in the retention pocket  21  at a position that the neck supporting element  22  is upwardly protruded from the top layer  11 , in such a manner that the neck supporting element  22  is adapted for filling at a neck curvature of a user to provide a natural neck support for the user when a head of the user supports on the pillow element  1  so as to keep the neck of the user in alignment with the spine while sleeping. Accordingly, the elongated retention pocket  21  is extending along the length of the pillow casing  10  and has a width substantially less than the width of the pillow casing  10 . 
     Accordingly, the pillow element  1 , which is a traditional pillow, comprises a pillow envelop and a filler filled therein, wherein the filler is generally made of down, feathers, or synthetic fills. According to the preferred embodiment, the user is able to dispose his or her own pillow in the pillow cover such that the user is able to sleep in a bed by using his or her own pillow for head support in a comfortable way. 
     According to the preferred embodiment, the pillow casing  10  is made of non-irritant, comfortable, and launderable material, such as woven fabric or cotton, to provide a relatively close fitting and to provide a soft surface in contact with the body of the user. The pillow casing  10  can be washable after the pillow element  1  is removed from the pillow casing  10  for hygiene purpose. 
     As shown in  FIG. 2 , the pillow casing  10  has a head support portion  101  defined at a center portion of the top layer  11  for the head of the user lying thereat and a neck support portion  102  adjacent to the head support region  101  at a position between two longitudinal ends of the top layer  11  at a position where the neck support  20  is located on the top layer  11  to align with the neck curvature of the user. Therefore, when the pillow element  1  is disposed in the pillow casing  10 , the head of the user is supported by the pillow element  1  at the head support portion  101  of the pillow casing  10  while the neck of the user is supported by the neck support  20  at the neck support portion  102  of the pillow casing  10 . 
     As shown in  FIGS. 1 and 2 , the retention pocket  21  has at least a side accessing opening  201  for the neck supporting element  22  replaceably receiving in the retention pocket  21  through the side accessing opening  201 . An attachment, such as Velcro, can be provided at the side accessing opening  201  to enclose the neck supporting element  22  in the retention pocket  21 . 
     In particularly, the retention pocket  21  comprises a pocket layer  211  overlapped on an outer surface of the top layer  11  of the pillow casing  10  to define an elongated pocket cavity  212  between the pocket layer  211  and the outer surface of the top layer  11  for retaining the neck supporting element  22  in the pocket cavity  212 , as shown in  FIG. 3 . Preferably, two longitudinal edges of the pocket layer  211  are stitched on the top layer  11  of the pillow casing  10  at the neck support region  102  thereof while at least one of the transverse edges of the pocket layer  211  is remained unsewn to form the side accessing opening  201 . Therefore, the neck supporting element  22  is adapted to dispose in the pocket cavity  212  through the side accessing opening  201 . 
       FIG. 5  illustrates an alternative mode of the retention pocket  21 A, wherein the retention pocket  21 A comprises a pocket layer  211 A overlapped on an inner surface of the top layer  11  of the pillow casing  10  to define an elongated pocket cavity  212 A between the pocket layer  211 A and the inner surface of the top layer  11  for retaining the neck supporting element  22  in the pocket cavity  212 A. In other words, the retention pocket  21 A is formed within the pillow cavity  13  in a hidden manner, so as to keep the aesthetic appearance of the pillow casing  10 . 
       FIG. 5A  illustrates an alternative mode of the pillow cover, wherein the pillow casing  10  further has two side edge portions  103  and a center usage portion  104  between the two side edge portions  103 . Accordingly, the head of the user will lie on the pillow cover at the center usage portion  104 , wherein the longitudinal length of the center usage portion  104  is long enough for the head of the user to turn right or left while the head of the user still supports on the pillow cover. 
     In particular, the neck supporting element  22  has a length at least equal to the longitudinal length of the center usage portion  104  of the pillow casing  10 , such that when the neck supporting element  22  is received in the elongated retention pocket  21 , the neck supporting element  22  is long enough to match with the longitudinal length of the center usage portion  104  of the pillow casing  10 . In other words, the length of the neck supporting element  22  can be shorter than the length of the pillow cover  10  to provide the natural neck support for the user when a head of the user supports on the pillow element  1  so as to keep the neck of the user in alignment with the spine while sleeping. It is appreciated that the elongated retention pocket  21 A can be formed with a length matching with the longitudinal length of the center usage portion  104  of the pillow casing  10  such that the length of the elongated retention pocket  21 A matches with the length of the neck supporting element  22 . In addition, the pocket layer  211 A can be overlapped on the inner surface of the top layer  11  of the pillow casing  10  to define an elongated pocket cavity  212 A between the pocket layer  211 A and the inner surface of the top layer  11  for retaining the neck supporting element  22  in the pocket cavity  212 A. Or, the pocket layer  211  is overlapped on the outer surface of the top layer  11  of the pillow casing  10  to define an elongated pocket cavity  212  between the pocket layer  211  and the outer surface of the top layer  11  for retaining the neck supporting element  22  in the pocket cavity  212 . 
     As shown in  FIG. 1 , the neck supporting element  22 , which is made of deformable material, has a top curved supporting surface having a curvature matching with a curvature of the neck of the user to fittingly support the neck of the user at the top curved supporting surface. Accordingly, the neck supporting element  22 , having an elongated structure corresponding to the pocket cavity  212 , comprises a tubular pillow bag  221  and a pillow filler  222  filled in the pillow bag  221 . The pillow filler  222  can be made of made of down, feathers, or synthetic fills. Accordingly, the pillow filler  222  can also be made of activated carbon for air purification, herbs such as Lavender or Rosemary, or beans depending on the user&#39;s preference. 
     Alternatively, the neck supporting element  22 A comprises an elongated foam detachably received in the pocket cavity  212 , wherein the neck supporting element  22 A is preferably made of memory foam. Likewise, the neck supporting element  22 B comprises an inflatable bag  221 B and a valve  222 B provided thereon for popping the inflatable bag  221 B by air inflation. Accordingly, the stiffness of the neck supporting element  22 B can be selectively adjusted by retaining a desired volume of air in the inflatable bag  221 B. Once the inflatable bag  221 B is deflated, the pillow cover can be folded into a relatively small size for enhancing the portability of the pillow cover. 
     It is worth to mention that the neck supporting elements  22 ,  22 A,  22 B are replaceable and interchangeable such that the user is able to choose the corresponding neck supporting element  22 ,  22 A,  22 B for neck support according to the user preference. Therefore, the user is able to select and adjust different stiffness of the neck supporting elements  22 ,  22 A,  22 B for neck support. 
     In order to manufacture the pillow cover of the present invention, the pillow casing  10  comprises a piece of fabric layer  14  folded in half and stitched along two longitudinal edges  141  as a connection line to form the top and bottom layers  11 ,  12 , wherein the retention pocket  21  is provided at the fabric layer  211  along a centerline  142  between the two longitudinal edges  141  such that the connection line always located at the bottom layer  12  while the neck supporting element  22  is retained at the top layer  11 . 
     Preferably, two transverse edges of the fabric layer  14  are remained unsewn to form two side openings of the pillow casing  10  such that the pillow element  1  is adapted to receive in the pillow cavity  13  through one of the side openings. Accordingly, the neck supporting element  22  is selectively adjusted to its geographic location with respect to the pillow element  1  by encirclingly shifting the pillow casing  10  around the pillow element  1 . Therefore, the user is able to re-locate the geographic location of the neck supporting element  22  to fittingly support the neck of the user with respect to the curvature and contour of the neck of the user during sleeping. Accordingly, one of the side openings of the pillow casing  10  can also be sewn that one side of the pillow casing  10  forms an opening side while another side of the pillow casing  10  forms a closed side. 
     It is appreciated that the pillow casing  10  comprises two fabric layers overlapped with each other that the longitudinal edges of the fabric layers are sewn with each other as shown in  FIG. 5  to define the top and bottom layers  11 ,  12 . 
     It is appreciated that the pillow casing  10  forms as the pillow envelope that the filler is directly filled into the pillow casing  10 , as shown in  FIG. 6 , so as to omit the pillow envelope of the traditional pillow element  1 . Therefore, the pillow element  1  is embodied as the filler only to receive in the pillow casing  10 . In other words, the top and bottom layers  11 ,  12  of the pillow casing  10  are affixed edge-to-edge that two side openings of the pillow casing  10  are sewn to retain the filler in the pillow cavity  13  such that the pillow casing  10  with the filler therein becomes a head support with built-in neck support ability. 
     As shown in  FIG. 7 , a pillow cover according to a second embodiment illustrates an alternative mode of the first embodiment, wherein the pillow cover comprises a pillow casing  10 D and a neck support  20 D. 
     The pillow casing  10 D has a top layer  11 D and a bottom layer  12 D overlapping therewith and defines a pillow cavity  13 D between the top and bottom layers  11 D,  12 D, wherein a traditional pillow element  1  is adapted to be received in the pillow cavity  13 D of the pillow casing  10 D. The pillow casing  10 D has a head support portion  101 D defined at a center portion of the top layer  11 D for the head of the user lying thereat and a neck support portion  102 D adjacent to the head support region  101 D at a position between two longitudinal ends of the top layer  11 D where the neck support  20 D is located on the top layer  11 D to align with the neck curvature of the user. Therefore, when the pillow element  1  is disposed in the pillow casing  10 D, the head of the user is supported by the pillow element  1  at the head support portion  101 D of the pillow casing  10 D while the neck of the user is supported by the neck support  20 D at the neck support portion  102 D of the pillow casing  10 D. 
     The top layer  11 D of the pillow casing  10 D further has two side edge portions  103 D and a center usage portion  104 D between the two side edge portions  103 D. Accordingly, the head of the user will lie on the pillow cover at the center usage portion  104 D, wherein the longitudinal length of the center usage portion  104 D is long enough for the head of the user to turn right or left while the head of the user still supports on the pillow cover. 
     The neck support  20 D comprises an elongated retention pocket  21 D longitudinally provided at the top layer  11 D of the pillow casing  10 D and a neck supporting element  22 D receiving in the retention pocket  21 D at a position that the neck supporting element  22 D is upwardly protruded from the top layer  11 D, in such a manner that the neck supporting element  22 D is adapted for filling at a neck curvature of a user to provide a natural neck support for the user when a head of the user supports on the pillow element  1  so as to keep the neck of the user in alignment with the spine while sleeping. Accordingly, the elongated retention pocket  21 D is extending along the length of the pillow casing  10 D and has a width substantially less than the width of the pillow casing  10 D. 
     The neck support  20 D further comprises a neck support adjustment  23 D for selectively adjusting the position of the neck supporting element  22 D at the top layer  11 D of the pillow cover  10 D. As shown in  FIG. 7 , the neck support adjustment  23 D comprises a plurality of first fasteners  231 D provided at the pillow cover  10 D and a plurality of second fasteners  232 D provided at the retention pocket  21 D to detachably and selectively fasten with the first fasteners  231 D respectively to adjustably hold the retention pocket  21 D in position, so as to adjustably retain the neck support element  22 D at the pillow casing  10 D. It is worth mentioning that the retention pocket  21 D is preferably fastened at the inner side of the top layer  11 D of the pillow cover  10 D. 
     According to the preferred embodiment, the first fasteners  231 D are a plurality of buttonholes and are spacedly formed along the side edge portions  103 D of the top layer  11 D of the pillow cover  10 D. It is worth mentioning that the user will not use the side edge portions  103 D of the pillow cover  10 D for head support, therefore, the user will not feel any uncomfortable with the first fasteners  231 D. The second fasteners  232 D are a plurality of corresponding button elements and are provided at two side portions of the retention pocket  21 D respectively. Since the length of the retention pocket  21 D is shorter than the length of the top layer  11 D, the number of first fasteners  231 D is larger than the number of the second fasteners  232 D. In other words, the first fasteners  231 D are provided along the side edge portions  103 D of the top layer  11 D while the second fasteners  232 D are only provided at the side edge portions of the retention pocket  21 D. 
     Therefore, by selectively fastening the button elements with two corresponding buttonholes to hold the retention pocket  21 D at a desired position, the neck supporting element  22 D can be received in the retention pocket  21 D matching with the neck position of the user when the head of the user supports on the pillow cover  10 D. 
     The retention pocket  21 D has at least side accessing opening  201 D. Therefore, the neck supporting element  22 D is adapted to dispose in the pocket cavity  212 D through the side accessing opening  201 D. It is worth mentioning that when the retention pocket  21 D is detachably affixed to the top layer  11 D of the pillow casing  10 D via the first and second fasteners  231 D,  232 D, the side accessing opening  201 D of the retention pocket  21 D will be closed via the attachment between the first and second fasteners  231 D,  232 D, so as to secure the neck supporting element  22 D within the retention pocket  21 D. 
     It is appreciated that the first and second fasteners  231 D,  232 D can be buttonholes and button elements, snap buttons, hook and loop fasteners, or the like. 
     In particular, the neck supporting element  22 D has a length at least equal to the longitudinal length of the center usage portion  104 D of the pillow casing  10 D, such that when the neck supporting element  22 D is received in the elongated retention pocket  21 D, the neck supporting element  22 D is long enough to match with the longitudinal length of the center usage portion  104 D of the pillow casing  10 D. In other words, the length of the neck supporting element  22 D can be shorter than the length of the pillow cover  10  to provide the natural neck support for the user when a head of the user supports on the pillow element  1  so as to keep the neck of the user in alignment with the spine while sleeping. It is appreciated that the elongated retention pocket  21 D can be formed with a length matching with the length of the pillow casing  10 D such that the length of the elongated retention pocket  21 D is longer than the length of the neck supporting element  22 D. 
     As shown in  FIG. 8 , a pillow cover according to a third embodiment illustrates an alternative mode of the first embodiment, wherein the pillow cover comprises a pillow casing  10 E and a neck support  20 E. 
     The pillow casing  10 E has a top layer  11 E and a bottom layer  12 E overlapping therewith and defines a pillow cavity  13 D between the top and bottom layers  11 E,  12 E, wherein a traditional pillow element  1  is adapted to be received in the pillow cavity  13 E of the pillow casing  10 E. The pillow casing  10 E has a head support portion  101 E defined at a center portion of the top layer  11 E for the head of the user lying thereat and a neck support portion  102 E adjacent to the head support region  101 E at a position between two longitudinal ends of the top layer  11 E where the neck support  20 E is located on the top layer  11 E to align with the neck curvature of the user. Therefore, when the pillow element  1  is disposed in the pillow casing  10 E, the head of the user is supported by the pillow element  1  at the head support portion  101 E of the pillow casing  10 E while the neck of the user is supported by the neck support  20 E at the neck support portion  102 E of the pillow casing  10 E. 
     The pillow casing  10 E further has two side edge portions  103 E and a center usage portion  104 E between the two side edge portions  103 E. Accordingly, the head of the user will lie on the pillow cover at the center usage portion  104 E, wherein the longitudinal length of the center usage portion  104 E is long enough for the head of the user to turn right or left while the head of the user still supports on the pillow cover. 
     The neck support  20 E comprises a retention pocket  21 E longitudinally provided at the top layer  11 E of the pillow casing  10 E and a neck supporting element  22 E receiving in the retention pocket  21 E at a position that the neck supporting element  22 E is upwardly protruded from the top layer  11 E, in such a manner that the neck supporting element  22 E is adapted for filling at a neck curvature of a user to provide a natural neck support for the user when a head of the user supports on the pillow element  1  so as to keep the neck of the user in alignment with the spine while sleeping. Accordingly, the elongated retention pocket  21 E is extending along the length of the pillow casing  10 E and has a width substantially less than the width of the pillow casing  10 E. 
     The neck support  20 E further comprises a neck support adjustment  23 E for selectively adjust the position of the neck supporting element  22 E at the pillow cover  10 E. As shown in  FIG. 8 , the neck support adjustment  23 E comprises a pocket layer  231 E overlapped under the top layer  11 E of the pillow casing  10 E and a plurality of longitudinal stitches evenly and spacedly formed to affix the pocket layer  231 E with the top layer  11 E so as to form the retention pocket  21 D between two adjacent longitudinal stitches. In other words, the top layer  11 E of the pillow casing  10 E forms a double-layered structure with the pocket layer  231 E. 
     Accordingly, at least one of the transverse edges of the pocket layer  211 E is remained unsewn to form the side accessing opening  201 E of each of the retention pockets  21 E. Therefore, the neck supporting element  22 E is adapted to dispose in the pocket cavity  212 E through the side accessing opening  201 E. 
     Therefore, the user is able to selectively dispose the neck supporting element  22 E in one of the retention pockets  21 E to match with the neck position of the user when the head of the user supports on the pillow cover  10 E. 
     In particular, the neck supporting element  22 E has a length at least equal to the longitudinal length of the center usage portion  104 E of the pillow casing  10 E, such that when the neck supporting element  22 E is received in the elongated retention pocket  21 E, the neck supporting element  22 E is long enough to match with the longitudinal length of the center usage portion  104 E of the pillow casing  10 E. 
     As shown in  FIG. 9 , a pillow cover according to a fourth embodiment illustrates an alternative mode of the first embodiment, wherein the pillow cover comprises a pillow casing  10 F and a neck support  20 F. 
     The pillow casing  10 F has a top layer  11 F and a bottom layer  12 F overlapping therewith and defines a pillow cavity  13 F between the top and bottom layers  11 F,  12 F, wherein a traditional pillow element  1  is adapted to be received in the pillow cavity  13 E of the pillow casing  10 F. The pillow casing  10 F has a head support portion  101 F defined at a center portion of the top layer  11 F for the head of the user lying thereat and a neck support portion  102 E adjacent to the head support region  101 F at a position between two longitudinal ends of the top layer  11 F where the neck support  20 F is located on the top layer  11 F to align with the neck curvature of the user. Therefore, when the pillow element  1  is disposed in the pillow casing  10 F, the head of the user is supported by the pillow element  1  at the head support portion  101 F of the pillow casing  10 F while the neck of the user is supported by the neck support  20 F at the neck support portion  102 F of the pillow casing  10 F. 
     The pillow casing  10 F further has two side edge portions  103 F and a center usage portion  104 F between the two side edge portions  103 F. Accordingly, the head of the user will lie on the pillow cover at the center usage portion  104 F, wherein the longitudinal length of the center usage portion  104 F is long enough for the head of the user to turn right or left while the head of the user still supports on the pillow cover. 
     The neck support  20 F comprises a retention pocket  21 F longitudinally provided at the top layer  11 F of the pillow casing  10 F and a neck supporting element  22 F receiving in the retention pocket  21 F at a position that the neck supporting element  22 F is upwardly protruded from the top layer  11 F, in such a manner that the neck supporting element  22 F is adapted for filling at a neck curvature of a user to provide a natural neck support for the user when a head of the user supports on the pillow element  1  so as to keep the neck of the user in alignment with the spine while sleeping. Accordingly, the elongated retention pocket  21 F is extending along the length of the pillow casing  10 F and has a width substantially less than the width of the pillow casing  10 F. 
     The neck support  20 F further comprises a neck support adjustment  23 F for selectively adjusting the position of the neck supporting element  22 F at the pillow cover  10 F. As shown in  FIG. 9 , the neck support adjustment  23 F comprises a pocket layer  231 F foldably overlapped on the outer side of the top layer  11 F of the pillow casing  10 F to define the retention pocket  21 F between the top layer  11 F and the pocket layer  231 F and a fastening unit  232 F provided between the top layer  11 F and the pocket layer  231 F to adjustably retain the neck supporting element  22 F within the retention pocket  21 F. 
     In particular, the neck supporting element  22 F has a length at least equal to the longitudinal length of the center usage portion  104 F of the pillow casing  10 F, such that when the neck supporting element  22 F is received in the elongated retention pocket  21 F, the neck supporting element  22 F is long enough to match with the longitudinal length of the center usage portion  104 F of the pillow casing  10 F. 
     According to the preferred embodiment, the pocket layer  231 F has a longitudinal folding edge, preferably top edge thereof, affixed to the top layer  11 F and an opposed longitudinal free edge, such that the pocket layer  231 F can be folded to overlap on the top side of the top layer  11 F so as to form a double-layered structure. It is worth mentioning that the size of the pocket layer  231 F matches with the size of the top layer  11 F such that the pocket layer  231 F can fit to fold on the top layer  11 F. 
     The fastening unit  232 F comprises a plurality of first fasteners  2321 F provided on the outer side of the top layer  11 F of the pillow casing  10 F and a plurality of second fasteners  2322 F provided at the inner side of the pocket layer  231 F to detachably fasten with the first fasteners  2321 F respectively, so as to adjustably retain the neck support element  22 F in position when the pocket layer  231 F is folded on top of the top layer  11 F. 
     Accordingly, the first fasteners  2321 F are two elongated hook fasteners and are formed along the side edge portions  103 F of the top layer  11 F of the pillow cover  10 F. It is worth mentioning that the user will not use the side edge portions  103 F of the pillow cover  10 F for head support, therefore, the user will not feel any uncomfortable with the first fasteners  2321 F. The second fasteners  2322 F are two elongated loop fasteners and are provided at two side portions of the pocket layer  211 F respectively. Therefore, when the pocket layer  211 F is folded on top of the top layer  11 F, the first and second fasteners  2321 F,  2322 F are fastened with each other to hold two side portions of the neck supporting element  22 F in position. In other words, when the two side portions of the neck supporting element  22 F are held by the attachment between the first and second fasteners  2321 F,  2322 F, the neck supporting element  22 F can be retained at a desired position corresponding to the neck position of the user. Accordingly, the user is able to locate the neck supporting element  22 F on the top layer  11 F at a desired position to match with the neck position of the user, such that when the pocket layer  211 F is folded on top of the top layer  11 F, the neck supporting element  22 F will be retained at the desired position. 
     It is appreciated that the first and second fasteners  2321 F,  2322 F can also provided at the top and bottom sides of the neck supporting element  22 F at the side portions thereof, such that the first fasteners  2321 F at the top layer  11 F can fasten with the second fasteners  2323 F at the bottom side of the neck supporting element  22 F while the second fasteners  2322 F at the pocket layer  211 F can fasten with the first fasteners  2321 F at the top side of the neck supporting element  22 F so as to further secure the position of the neck supporting element  22 F. 
     In addition, the first and second fasteners  2321 F,  2322 F can also provided at the top layer  11 F and the free edge of the pocket layer  211 F such that when the pocket layer  211 F is folded on top of the top layer  11 F, the free edge of the pocket player  211 F can be retained on the corresponding position of the top layer  11 F via the first and second fasteners  2321 F,  2322 F. 
     It is worth mentioning that the neck supporting element  22 D,  22 E,  22 F can be one of the tubular pillow bag filled with the pillow filler, the elongated foam support, and the inflatable bag with a valve for popping the inflatable bag by air inflation as mentioned above. 
     It is worth to mention that the user is able to keep his or her own pillow element  1  in order to incorporate with the pillow cover of the present invention because of his or her own sleeping habit. In compassion with the traditional pillow, the size of the pillow cover of the present invention is relatively portable. Therefore, the user is able to carry the pillow cover of the present invention only during traveling. For example, the user is able to dispose the pillow element  1  provided by the hotel in the pillow cover of the present invention such that the neck support  20  of the pillow cover provides a substantial neck support to keep the neck of the user in alignment with the spine while sleeping. The user does not have to carry his or her own large pillow during traveling in order to provide the neck support function. In addition, it would be more personal hygiene that the user uses the pillow cover of the present invention to cover the pillow from the hotel. 
     One skilled in the art will understand that the embodiment of the present invention as shown in the drawings and described above is exemplary only and not intended to be limiting. 
     It will thus be seen that the objects of the present invention have been fully and effectively accomplished. It embodiments have been shown and described for the purposes of illustrating the functional and structural principles of the present invention and is subject to change without departure from such principles. Therefore, this invention includes all modifications encompassed within the spirit and scope of the following claims.