Abstract:
The present invention provides a lightweight and cushioned shoe&#39;s outsole having a pneumatic air tube swirled inside the outsole. 
     Shoe&#39;s outsole of present invention becomes extremely lightweight and cushioning when the pneumatic air tube inside the outsole is inflated. 
     The present invention provides an air mattress type inflatable bladder of shoe&#39;s insole having honeycomb-like construction by using tuft inside the insole. 
     Shoe&#39;s insole of present invention becomes extremely bouncing and cushioning when the bladder of the insole is inflated. 
     The present invention provides an air pressure alert system having an air compressive and expandable device and a liquid capillary. 
     The air pressure of the shoe&#39;s outsole and shoe&#39;s insole of present invention is able to track through the functions of air pressure alert system of present invention.

Description:
BACKGROUND OF THE INVENTION 
     This invention relates generally to the field of shoe&#39;s structure and more specifically to an article of manufacture for shoes comprising air cushioning system, air lightweight system, air pressure alert system and process for making same. 
     This invention provides a special outsole which comprises an air tube type bladder. This invention provides a special insole which comprises an inflatable air mattress type bladder. This invention provides a special capillary pressure device which can track the air pressure level of the bladder in the outsole and insole. 
     The most shoes comprise upper and sole. A layer of insole is inserted between upper and sole, especially for athletic shoes to absorb the shock. The outsole materials of athletic shoes include rubber and cellular foam such as EVA sponge. The rubber outsole is durable and flexible, but it is not lightweight. Conversely, the cellular outsole is lightweight, but it is not durable. 
     Usually, rubber sponge and EVA foam are used as the insole material because they are resilient and shock absorbent. The shock-absorbing and lightweight are the important features of design for athletic shoes, and the air is the best shock absorber and weight reducer. For decades, many inventers proposed several air bladder design in outsole and insole to increase the capability of shock absorbing. 
     Such as U.S. Pat. No. 5,333,397, an inflatable bladder is formed primarily along the peripheral area of the heel portion in the insole. 
     In U.S. Pat. No. 4,610,099, a bladder is longitudinal disposed in the heel region and reduced the cushioning gradually toward forefoot in the outsole. In U.S. Pat. No. 5,987,780, the sealed tubular bladders are peripherally disposed in the outsole. 
     The air bladder mentioned in prior technology such as U.S. Pat. No. 4,610,099, U.S. Pat. No. 5,987,780, and others etc., either ball bladder or tubular bladder doesn&#39;t cover the entire area of foot. There are some area or portion not covered by bladder. 
     The outsole of present invention comprising air tube which distributes entire outsole provides excellent cushion and extremely lightweight. 
     The insole of present invention comprising inflatable air bladder provides superior cushion covering entire sole of the feet. 
     BRIEF SUMMARY OF THE INVENTION 
     The primary object of the invention is to provide the extreme lightweight of the shoes. Another object of the invention is to provide the excellent cushion of the shoes. Another object of the invention is to provide the air pressure tracking design to maintain the lightweight and cushioning functions of the shoes. 
     Other objects and advantages of the present invention will become apparent from the following descriptions, taken in connection with the accompanying, wherein, by way of illustration and example, an embodiment of the present invention is disclosed. 
     In accordance with a preferred embodiment of the invention, there is disclosed that the invention provides an air cushion and lightweight system comprising pneumatic air tube swirled inside the outsole and inflatable air bladder insole covering entire sole of the feet. 
     In accordance with a preferred embodiment of the invention, there is disclosed that an air passage tube is connected between outsole and insole. When both insole and outsole are inflated, the shoe provides superior shock absorbing and extreme lightweight. 
     In accordance with a preferred embodiment of the invention, there is disclosed that a capillary pressure device is attached to counter back of the shoe and connected to outlet port of air tube in outsole for detecting the level of air pressure. 
     The present invention provides a lightweight and cushioned shoe&#39;s outsole having a pneumatic air tube swirled inside the outsole. 
     Shoe&#39;s outsole of present invention becomes extremely lightweight and cushioning when the pneumatic air tube inside the outsole is inflated. 
     The present invention provides an air mattress type inflatable bladder of shoe&#39;s insole having honeycomb-like construction by using tuft inside the insole. Shoe&#39;s insole of present invention becomes extremely bouncing and cushioning when the bladder of the insole is inflated. 
     The present invention provides an air pressure alert system having an air compressive and expandable device and a liquid capillary. 
     The air pressure of the shoe&#39;s outsole and shoe&#39;s insole of present invention is able to track through the functions of air pressure alert system of present invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The drawings constitute a part of this specification and include exemplary embodiments to the invention, which may be embodied in various forms. It is to be understood that in some instances various aspects of the invention may be shown exaggerated or enlarged to facilitate an understanding of the invention. 
         FIG. 1A  is a top view of the bottom half of the outsole of invention. 
         FIG. 1B  is a bottom view of the top half of the outsole of invention. 
         FIG. 2  is an isometric view of the pneumatic tube bladder of invention. 
         FIG. 3A  is an isometric view of the outsole of invention. 
         FIG. 3B  is an isometric view of bottom half of outsole of invention with flexible pneumatic tube bladder inserted. 
         FIG. 4  is an isometric view of the insole of invention with enlarged detail. 
         FIG. 5  is an isometric view of the outsole position in shoe of invention. 
         FIG. 6  is an isometric view of the insole position in shoe of invention. 
         FIG. 7  is an isometric view of the combination of outsole and insole as a single unit in shoe of invention. 
         FIG. 8  is a cross sectional view of air pressure alert system and its position in shoe of invention. 
         FIG. 9  is a prospective view from bottom showing the position of capillary device in shoe of invention 
     
    
    
     REFERENCE NUMBER IN DRAWINGS 
     
         
           10  is the outsole formed by combination of top half outsole and bottom half outsole. 
           11  is the air outlet port of outsole formed by combination of top half air outlet port and bottom half air outlet port. 
           12  is the hiding bladder inserted in the outsole which is combined top half outsole and bottom half outsole. 
           13  is the air inlet port of outsole formed by combination of top half air inlet port and bottom half air inlet port. 
           14  is the top sheet of inflatable air bladder of insole. 
           15  the bottom sheet of inflatable air bladder of insole. 
           16  is the side sheet of inflatable air bladder of insole. 
           17  is the tuft sheet of inflatable air bladder of insole. 
           18  is the port of air passage connected to outsole. 
           19  is an air inlet port. 
           20  is the air passage between outsole and insole. 
           21  is the upper part of shoe. 
           22  is a rigid tube connected between pneumatic air tube and air pressure transmission device. 
           23  is a pulling nut attached to the end of pneumatic air tube. 
           24  is a steel coil spring. 
           25  is an accordion type expandable and flexible tube. 
           26  is a capillary tube. 
           27  is the counter part of shoe. 
           28  is the bottom of shoe. 
           31  is the surface of joint area both on top half and bottom half outsole. 
           32  is the half cylinder channel hollow both in top and bottom half outsole. 
           33  is the half port of air inlet both in top half and bottom half outsole  4  is the half port of air outlet both in top half and bottom half outsole. 
           35  is the outer diameter of pneumatic air tube. 
           36  is the hollow of pneumatic air tube. 
           37  is the inner diameter of pneumatic air tube. 
           38  is a pneumatic air tube. 
           39  is body of half outsole both top and bottom. 
       
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Detail descriptions of the preferred embodiment are provided herein. It is to be understood, however, that the present invention may be embodied in various forms. Therefore, specific details disclosed herein are not to be interpreted as limiting, but rather as a basis for the claims and as a representative basis for teaching one skilled in the art to employ the present invention in virtually any appropriately detailed system, structure or manner. 
     While the invention has been described in connection with a preferred embodiment, it is not intended to limit the scope of the invention to the particular form set forth, but on the contrary, it is intended within the spirit and scope of the invention as defined by the appended claims. 
       FIG. 1A  shows half bottom part of invention outsole  31  which the half bottom channel of tubular hollow  32  is distributed from half bottom air inlet port  33  along the edge line of outsole pattern swirling toward the half bottom air outlet port  34 . 
       FIG. 1B  shows half top part of invention outsole  31  which the half top channel of tubular hollow  32  is distributed from top air inlet port  33  along the edge line of outsole pattern swirling toward the half top air outlet port  34 . 
     Either half bottom part outsole  31  or half top part outsole  31  is fabricated by injection molding or compression molding and made from rubber or synthetic resins. 
       FIG. 2  shows the pneumatic tube bladder  38  which comprises outer diameter  35 , inner diameter  37  and hole  36 . There is a synthetic fiber coiling around the pneumatic bladder tube  38  to hold the shape of the tube when the tube is inflated. Otherwise, the deformation of the pneumatic bladder tube  38  would twist the shape of invention outsole. 
     Turning to  FIG. 3B  first, then to  FIG. 3A . 
       FIG. 3B  shows the pneumatic bladder  38  is inserted in the half cylinder channel hollow  32  in bottom half outsole ( FIG. 1A ). 
       FIG. 3A  shows the embodiment of invention outsole which is the combination of half bottom part outsole ( FIG. 1A ) and half top part outsole ( FIG. 1B ). 
     There is shown in  FIG. 3A  that the hiding pneumatic tube bladder  12  is inserted invisibly from outside in the channel of invention outsole, and it is the function of hiding pneumatic tube bladder  12  that makes the lightweight and cushioning of invention outsole. 
     In combination process, the surface of half bottom outsole  31  and the surface of half top outsole  31  are ground and coated with the adhesives. The half top air inlet port  33  should meet exactly to half bottom air inlet port  33 , and the half top air outlet port  34  should meet exactly to the half bottom air outlet port  34 . 
     After grinding and coating, half bottom part outsole ( FIG. 1A ) and half top part outsole ( FIG. 1B ) are bound together and placed in the mold, then the mold is placed in the autoclave to cure the adhesive. After curing, the outsole of present invention is shown as  FIG. 3A  which the hiding pneumatic tube bladder  12  is inflated creating the lightest weight sole and providing the superior cushion. 
     Turning now to  FIG. 4 , the inflatable air bladder insole of the present invention is composed of top air barrier sheet  14 , bottom air barrier sheet  15 , side air barrier sheet  16  and air inlet valve  19 . Between top air barrier sheet  14  and bottom air barrier sheet  15 , there is a tuft strap  17  to connect the two sheets and maintaining the distance of top and bottom. 
     Also, in  FIG. 3A  and  FIG. 4 , there is an air passage  20  to connect the air outlet port of insole  18  and air inlet port of outsole  13 . Therefore, the pressured air can inject from air inlet valve  19  into inflatable bladder insole passing through air passage  18  to air inlet port of outsole  13  and exhaling through air outlet port of outsole  11 . 
       FIG. 5  shows the constructional position of outsole of present invention in the structure of shoe. 
       FIG. 6  shows the constructional position of insole of present invention in the structure of shoe. 
       FIG. 7  shows the constructional position of outsole and insole of present invention in the structure of shoe. 
     Since the technology of present invention creates the lightest weight shoe sole including outsole and insole, the walker&#39;s body weight distributes more evenly to ease pressure point of the feet. This makes the walker&#39;s feet feeling less fatigue and like walking on air. 
     To assure the performances of light-weight and cushioning, the air pressure in the bladder of insole and outsole of this invention should be maintained within appropriate range. A pressure alert system of invention is installed in the counter area of the shoe to ensure the air pressure level in the bladder of insole and outsole of invention. 
       FIG. 8  shows the overall structure of both the air pressure transmission device and the air capillary device. 
     The air pressure transmission device  22  within the sole is connected to an air bladder on one side and to the capillary device  26  on the rear of the shoe. 
     The air pressure transmission device  22  is a cylinder tube containing a metal nut  23 , a steel coil  24  and an accordion shaped tube  25 . 
     The accordion shaped tube  25  is expandable and compressible. It is made from flexible thermoplastic resins or thermoplastic elastomers. Thermoplastic resins include, but not limited to, flexible PVC and thermoplastic polyurethane. Thermoplastic elastomers, on the other, include but not limited to, thermoplastic EP rubber (Ethylene-propylene copolymer) and thermoplastic SBS rubber (Styrene-butadiene-styrene block copolymer). Both types of thermoplastics are manufactured using a plastic injection molding machine. 
     The accordion shaped tube  25  stores a liquid including, but not limited to, water or alcohols. The liquid is dyed or pigmented to a brilliant shade of color. 
     The capillary device  26  connecting to the accordion shaped tube  25  is a capillary tube made of transparent plastic including, but not limited to, PVC, Acryl resin, and Polycarbonate resin. 
     The basic operation of the preferred embodiment containing the air pressure transmission device  22  and the capillary device  26  is as follows. 
     The air bladder within the shoe exerts a pressure to the metal nut  23  and compresses the steel coil  24 . 
     The compressed steel coil  24  transmits the pressure to the accordion shaped tube  25 . 
     Consequently, the colored liquid stored inside the accordion shaped tube  25  is pushed into the capillary tube  26 . 
     The more pressure the air bladder exerts, the more colored liquid is forced into the capillary tube  26 . 
     This process can also occur in reverse. 
     When the pressure in the air bladder is reduced, there is less pressure on the metal nut  23 , thus releasing the tension in the steel coil  24 . As a result, the steel coil  24  exerts less force against the accordion shaped tube  25  and the colored liquid inside the capillary tube  26  flows back to the accordion shaped tube  25  due to its expansion accordingly. 
     There are two lines, an upper and lower, on the capillary tube  25  marking the proper pressure range necessary for the air bladder to maintain. The upper line indicates the maximum allowable pressure while the lower line indicates the minimum required pressure. 
       FIG. 8  shows the structure of the device of air pressure alert system of invention. The pressure alert system of invention compromises of pressure transmission device  22  and capillary device  26  which the bottom of capillary device  26  is connected to the end of pressure transmission device  22 . 
     Inside the pressure transmission device  22 , the stopper  23  attached to the end of pneumatic air tube  12  in the invention outsole is connected to steel coil spring  24 , and the steel coil spring  24  is connected to the accordion-like expandable container  25 . 
     Then, the accordion-like expandable container  25  is connected to capillary device  26  which can track the pressure inside the bladder in outsole and insole of invention. The accordion-like expandable container  25  which holds the colored liquid such as dyed alcohols and others is made of rubber or flexible vinyl and others. 
     Capillary device  26  is made of transparent plastics such as acrylic resins, polycarbonate resins, polyester resins, rigid PVC resins and others. 
     While the bladder in outsole of invention  12  and the bladder in invention insole ( FIG. 4 ) are fully inflated, the pressure air will compress the spring steel coil  24 . 
     In turn, the pressure applied to spring steel coil  24  transfers and compresses the accordion-like expandable tank  25  where the colored liquid inside is pushed into the capillary  26 . 
     By contrary, when the air pressure in the bladder of invention outsole  12  or the bladder of invention insole ( FIG. 4 ) is deflated, the tension applied to spring steel coil  24  will be reduced. 
     In turn, the unloaded spring steel coil  24  withdraws the accordion-like expandable tank  25 , and the colored liquid in capillary  26  flows reversely back to accordion-like expandable tank  25 . 
     Therefore, the colored liquid column gets higher in capillary  26  if the air pressure of bladder in sole of invention is increasing. 
     Whereas, the colored liquid column gets lower in capillary  26  if the air pressure of bladder in sole of invention is decreasing. 
     In other words, the air pressure of bladder inside the sole of invention can be tracked by the range of colored liquid column in the capillary device  26 . 
     There are marks, top limit line and bottom limit line, on capillary device  26  for alert purpose. 
     The top limit line indicates the maximum allowance of air pressure, and the bottom limit line indicates the minimum requirement of air pressure. 
     The pressure alert system of invention provides the warning if the air pressure in the sole of invention is over loaded or under loaded. 
     While the bladder inside the invention insole and invention outsole are fully inflated, the colored liquid will be pushed to the higher rank in capillary. 
     The air pressure of the bladder in the invention shoe&#39;s sole is easily checked in a glance by the air pressure alert system of this invention.