Abstract:
An embodiment of an article of luggage is disclosed, the luggage in one practice having compression and expansion capability comprising an interposed metal frame of split configuration having an expansion portion positioned between the split where the metal frame is attached to one side of the luggage. One of more expansion and locking devices permit compression of contents and also enables locking the luggage in its expanded shape.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application claims benefit of to the following U.S. Patent Application: U.S. Patent Application Ser. No. 62/182,172, filed Jun. 19, 2015, the entire contents of which is incorporated herein by reference. 
    
    
     FIELD OF THE INVENTION 
     The disclosure relates to wheeled luggage of expandable construct permitting a user to selectively increase or decrease the capacity of the luggage. The wheeled features are designed to allow the user to freely move the luggage in a standing position, and to spin the luggage over one or more predetermined axes, including conveniently around its vertical axis when the luggage is upright. 
     BACKGROUND OF THE INVENTION 
     Hitherto, expandable luggage has been typified by zippered sections that, when unzipped, permits the luggage to be expanded by, for example, gussets and the like. Other practices involve complicated expansion mechanisms which let the luggage expand but do not lock or otherwise secure so as to maintain the expanded shape. Moreover, hard-sided luggage, in particular, because of inflexibility due to the rigidness of materials of construction, has been problematic for successful implementation of compression-expansion practices, thus leaving a need in this style of luggage. 
     SUMMARY OF THE INVENTION 
     In one aspect, the invention is an article of luggage having compression-expansion capability comprising a main body, the main body comprised of first and second shells, preferably hard sided first and second shells, that are operably connected, e.g. pivotably connected, to form a storage cavity or cavities when closed; a split metal frame interposed between the first and second shells and connected to the first shell, the split metal frame having an expansion portion positioned between the split; at least one expansion and locking device disposed within the first shell and configured to allow free movement of the expansion portion in a compression direction toward the first shell, and configured to enable locking of the expansion portion in an expanding direction away from the first shell; and at least one handle, e.g. an extendable handle, attached to the main body. The luggage may further comprise a plurality of wheels attached to each of the first and second shells, e.g. at the bottoms thereof. Optionally, the wheels are able to spin about the vertical axis of the main body when the main body is in an upright position. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1A  is a side view of an embodiment of the invention showing the luggage upright and unexpanded. 
         FIG. 1B  is a side view of the embodiment of  FIG. 1A  showing the luggage expanded. 
         FIG. 2A  is a perspective view of an embodiment of the invention showing the luggage opened and unexpanded. 
         FIG. 2B  is a perspective view of the embodiment of  FIG. 2A  showing the luggage opened and expanded. 
         FIG. 3A  is frontal view of an embodiment of the invention. 
         FIG. 3B  is a side view of the embodiment of  FIG. 3A . 
         FIG. 3C  is a bottom view of the embodiment of  FIG. 3A . 
         FIG. 4  is a partial side detail view of an embodiment of the invention. 
         FIG. 5A  is a side exploded view detail of an embodiment of a split metal frame of the invention. 
         FIG. 5B  is a side view detail of the embodiment of  FIG. 5A  assembled. 
         FIG. 6  is a frontal view of an embodiment of an expansion and locking device useful in the invention. 
         FIG. 7  is a plan view of an embodiment of a piece of luggage in accordance with the invention, opened. 
         FIG. 8A  is a frontal view of an embodiment of the invention 
         FIG. 8B . is a rear view of an embodiment of the invention. 
         FIG. 9  is a partial view of an embodiment of the invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The entire contents of the following applications are incorporated by reference herein: U.S. Patent Application Publication No. 2013/0140119 and U.S. Patent Application Publication No. 2014/0353103. The invention in one embodiment is an article of luggage having compression-expansion capability, the article of luggage comprising a main body, which main body can be comprised of two or more shells; the following description as depicted in  FIGS. 1A, 1B, 2A, 2B, and 3A -C, exemplify a preferred practice wherein the main body  100  comprises a first shell  101  and a second shell  102 . The first and second shells can be identical or they can be different from one another in size and/or shape and/or capacity. The first and second shells can each independently be comprised of the same or different materials of construction; without limitation, materials of construction in this regard include fabric, plastic, metal, fiberglass, or combinations thereof. In a preferred practice, the article of luggage is hard sided, e.g. the first and second shells are at least partly comprised, preferably substantially comprised, and more preferably fully comprised of rigid or semi-rigid materials of construction such as plastics, metals, fiberglasses, rubbers, or combinations thereof. Plastic materials can include thermoplastics such as polycarbonates (PC), acrylonitrile butadiene styrene (ABS), polypropylene (PP), and combinations thereof; exemplary metals include aluminum, an aluminum alloy, and combinations thereof. 
     In one practice, the first and second shell can each optionally further comprise one or more outer compartments  113  accessed by zippers, lids, and the like,  112 . In one practice,  FIG. 4 , a zipper  112  provides access to compartment  113  the surface of which can be fabric, plastic, metal as herein described. The first and second shells are operably connected, e.g. pivotably connected,  FIG. 2A, 108   a , by means known in the art, including without limitation by hinge, zipper, latch, and the like, to form a storage cavity, which term includes multiple storage cavities, when the shells are closed. 
     Interposed between the first shell  101  and the second shell  102  is at least one split metal frame  103  which comprises at least frame portions  103   a  and  103   b , each of which frame portions can be independently comprised of metals known in the art and suitable for the purpose, e.g. light weight, mechanically strong, rust proof metals, including preferably without limitation, aluminum and aluminum alloys. In one practice, the split metal frame  103  is connected to the first shell  101 . Split metal frame  103  has an expansion portion  104  positioned between the split, e.g. interposed between frame portions  103   a  and  103   b . The expansion portion  104  comprises materials of construction known in the art, including without limitation: fabrics, synthetic polymers, or combinations thereof. A preferred polymer is nylon, more preferably high tenacity ballistic nylon. 
       FIG. 5A  shows a practice for securing the expansion portion  104  to the split metal frame portions  103   a  and  103   b  which is attached to shell  101 . In the embodiment shown, shell  101  fits into slot  103   c  of frame portion  103   a . Expansion portion  104  has its ends in contact with, or optionally secured, to board sections  114  and  114   a , which board sections can be plastic, e.g. polyethylene or polypropylene; these are fitted into slot  103   d  of frame portion  103   a , and slot  103   e  of frame portion  103   b . These are then secured by means known in the art, e.g. screws  115 ,  116 , or rivets and the like. In a preferred practice, the ratio of the depth of the first shell, as measured from its outer surface, to the expansion portion when fully extended, is up to about 2:1, preferably up to about 1.5:1. 
     The luggage article as herein described further comprises at least one expansion and locking device disposed within the first shell and configured to allow free movement of the expansion portion in a compression direction toward the first shell, and configured to enable locking of the expansion portion in an expanding direction away from the first shell. A preferred expansion and locking mechanism is a ratchet-type device  107  as depicted in  FIG. 6 , as described in U.S. Patent Application Publication No. 2013/0140119 and U.S. Patent Application Publication No. 2014/0353103, the entire contents of which are incorporated herein by reference. Preferably, as shown in  FIG. 7 , at least two expansion and locking mechanisms  107 , which can be the same or different, are disposed on substantially opposite, internal sides of the first shell  101 ; a flap or lining  117  can optionally be incorporated to cover seams, bindings and other mechanical aspects. Locking mechanisms  107  can be attached to the internal walls of shell  101  by means known in the art, e.g. rivets, screws, bolts and the like. At least one handle is attached to the main body.  FIG. 2A  shows carrying handle  108 ;  FIG. 3  shows extendable handle  109 ; extendable handle  109  can be mounted on either the outside or inside of the main body; preferably, it s mounted to be substantially flush with the outside surface of the main body. 
     In one practice the article of luggage may have wheels  105 ,  105   a , e.g. a plurality of wheels attached to each of the first and second shells, e.g. at the bottom thereof; preferably one or more of the wheels are designed to be able to spin about the vertical axis of the main body when the luggage is in an upright position thus making the luggage easily steerable in all directions. The wheels may be of design known in the art, e.g. casters, pairs, fixed (i.e. non-pivoting) wheels and the like. Sets of wheels, e.g.  105  and  105   a , may be the same of different. The wheels are preferably secured inside or outside the main body with internal caps  130 . In one practice the article of luggage may have two or more feet  140  attached to the first and second shells, e.g. at the bottom thereof to provide stability when the article of luggage is upright and has only two wheels. 
     The embodiments of the foregoing description are not limitative of the invention.