Abstract:
An air inflation tube of a mini-size air pump is disclosed. The air inflation tube of the air pump has a dual direction air inflation capability, that is, inflation and deflation, and the pressure releasing and air pumping are done by the same tubular body to solve the problem of excessive tire pressure without removing the air inflation tube.

Description:
BACKGROUND OF THE INVENTION 
   (a) Technical Field of the Invention 
   The present invention relates to an air inflation tube of a mini-size air pump assembly, and in particular, to an air inflation tube which possesses an air inflation and air pressure releasing dual direction mechanism. 
   (b) Description of the Prior Art 
     FIGS. 1 and 2  depict two types of air inflation tube of air inflation head. The first one, as shown in  FIG. 1 , is a locking type air inflation head A 1 , and the second type, as shown in  FIG. 2 , is a twisting type air inflation head (A 1 - 1 ). These two types can provide connection and air inflation mechanism, and the pumping and operation are as follows: 
   Air inflation: the nozzle of the tire is removed and a nozzle screw mount A 2  is connected to the air inflation head A 1 . As for the air inflation head A 1 - 1  of  FIG. 2 , the air inflation mount A 2 - 1  is mounted to the external screw mount of the nozzle and the pivotal shaft A 3 - 1  is twisted. The compressed air from these air pump will pass through air tube A 4  to the tire. 
   SUMMARY OF THE INVENTION 
   Accordingly, it is an object of the present invention is to provide air inflation tube of a mini-size air pump, having an air inflation mount, a pivotal shaft, a rubber pad, an air-outlet head, a leak-proof rubber pad, a pressure mount, an extension spring, a plug head, an adjustment rod, a ratchet button, a locking cap and a rubber mount, characterized in that the rear position of the air inflation mount is installed an air-venting device and the face of the pivotal shaft is a through slot allowing the exposure of the rubber mount, the rear section of the air outlet head of the air-venting device is a screw seat body in communication with an air passage of the air outlet head formed integrally, the external edge of the rear section of the air-outlet head is threaded for locking with the locking cap, and the bottom edge of the screw seat body is inserted with a leakage-proof rubber pad which is positioned by the press mount at the upper section thereof and the edge section of the bottom step layer of the screw seat body; the hollow section of the press mount is for the mounting of an extension spring which is the source of the force to force up the plug head, the upper section of the plug head is correspondingly mounted with an adjusting rod and the ratchet button, wherein the ratchet button is in combination with the adjusting ratchet at the bottom section of the shaft, and further, the teeth at the external edge of the shaft is a matching pair with the teeth path within the locking cap, and the adjusting rod is in combination with the inner teeth path by the adjusting teeth, whereby the adjusting rod, the ratchet button and the teeth path within the locking cap to provide up down reciprocating movement, and as a result of the pushing of teeth, the shaft of the adjusting rod is driven to form a rotational movement to provide a recess and a protrusion. 
   Yet still another object of the present invention is to provide an air inflation tube of a mini-size air pump, wherein the air venting device is formed integrally by the rear position of the air-venting head, and is formed into a screw seat body, the lower section of a bead shaft has an extension spring, and the bead shaft has a bead and the shaft body is protruded out of the locking cap, and a leakage-proof rubber pad is provided onto the bead between the locking cap and the screw seat body, and the body of the bead valve is provided with a leakage proof rubber band which can be operated by controlling the speed of air-venting. 
   The foregoing object and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts. 
   Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a perspective view of a conventional locking air inflation head. 
       FIG. 2  is a perspective view of a conventional twisting air inflation head. 
       FIG. 3  is a perspective view of an air inflation tube assembly of the present invention. 
       FIG. 4  is an exploded view of the parts of the air inflation tube assembly of the present invention. 
       FIG. 5  is a sectional view of the parts of the air inflation tube assembly of the present invention.  FIG. 6  is a sectional view showing the air-pressure release of the air inflation tube of the present invention. 
       FIG. 7  is a schematic view showing the operation of the first preferred embodiment. 
       FIG. 8  is a schematic view showing the operation of the second preferred embodiment. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   The following descriptions are of exemplary embodiments only, and are not intended to limit the scope, applicability or configuration of the invention in any way. Rather, the following description provides a convenient illustration for implementing exemplary embodiments of the invention. Various changes to the described embodiments may be made in the function and arrangement of the elements described without departing from the scope of the invention as set forth in the appended claims. 
   Referring to  FIG. 3 , there is shown the air inflation of the air tube assembly  100  of the present invention. The pivotal shaft of the air inflation mount is mounted to the external screw mount of the air nozzle of the tire. 
   As shown in  FIG. 4 , the air tube assembly  100 , includes an air inflation mount  1 , a pivotal shaft  2 , a rubber pad  3 , art air-outlet head  4 , a leak-proof rubber packing  5 , a pressure mount  6 , a spring  7 , a plug head  8 , an adjustment rod  9 , a ratchet button  10 , a locking cap  11 , and a rubber mount  12 . A peg shaft  13  causes the pivotal shaft  2  to pivotally connect to the air inflation mount  1  to provide twisting capability. The rubber pad  3  together with the nozzle of the tire to provide leak-proof capability. One face of the pivotal shaft  2  has a through slot  21  to expose the button  10  and the rubber mount  12  so as to provide “locking-shut” or “locking-pressure release”. 
   Referring to  FIGS. 5 and 6 , the front direction of the air outlet head  4  of the pressure releasing device is in combination with the air inflation mount  1 , and the rear direction is connected to the air tube  14  so as to provide an air-supply tube head. A screw seat body  41  is located between the air outlet head  4  and the air inflation mount head  1 , and the interior of the screw seat body  41  is hollow which is in communication with the air passage  40  of the air-outlet head  4 . The screw seat bad  41  has an externally threaded radial neck  42  for locking with the locking cap  11 . As shown in  FIGS. 4 ,  5  and  6 , the inner bottom edge of the screw seat body  41  is inserted with a leak-proof rubber packing  5  being positioned by the pressure mount  6  with the bottom step layer of the screw seat body  41 . The pressure mount  6  provides a positioning function, and has a stepped center hole  61  for receiving the spring  7  which is designed to force the plug head  8  to go upwardly. 
   On the top of the plug head  8  are mounted the adjustment shaft  9  and the ratchet button  10 . The ratchet button  10  has a tubular shaft  101  provided with a ratchet  102  to match with the adjusting teeth  92  provided on the shaft  91  of the adjustment rod  9 . The ratchet button  10  causes the teeth  103  provided on a lower end of the tubular shaft  101  and the teeth passage  111  to correspond with each other. The teeth passage  111  has dual layered structure and the adjustment rod  9  has a plurality of adjusting teeth  92  to correspond with the teeth passage  111 . Thus, the adjustment rod  9 , the ratchet button  10  and the teeth passage  111  of the locking cap  11  cause an up and down reciprocation movement and drive the shaft  91  to form a rotational movement. By using the rotational movement and the adjusting teeth  92  corresponding to the dual layered structure, a depression and a protrusion mechanism are obtained. In combination with the spring  7 , the plug head  8  and the adjustment rod  9  are simultaneously proceeded to recess and protrusion operation. This causes the air outlet head  4  to provide an open and close function. 
   In accordance with the present invention, during air inflation, the air releasing device is at a close state. If the pressure is too much and a release of the pressure is needed, the rubber pad  12  is depressed, and the pressure of the tire will be discharged via the discharge hole  112 . As shown in  FIG. 6 , the shuting of air releasing is always self-locking. That is to say, the pressure releasing status or the shuting state is always maintained. The rubber mount  12  is depressed once if the air pressure releasing is to be stopped. In other words, the depression of the rubber mount  12  causes a releasing of pressure or shuting of air pressure releasing, as shown in  FIG. 7 . 
   As shown in FIG  8 , the pressure releasing device is formed at the rear position of the air outlet head  4  with a screw seat body  41 . The releasing pressure structure is by way of depression. A bead valve rod  15  is in combination with a spring  7 . The bead valve rod  15  includes a bead valve  151  and the rod body is extended to the outside of the locking cap  11 . Next, a leak proof rubber packing  5  smaller than the bead valve  151  is located between the locking cap  11  and the screw seat body  41 . When the bead valve rod  15  is depressed, the air pressure will move from the bead valve  151  via the air discharging hole  112  of the lacking cap  11 . This structure facilitates rapid pressure releasing and the releasing of pressure can be easily controlled. The pressure gauze indication of the air pump can provide precise pressure reading for the tire. 
   It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above. 
   While certain novel features of this invention have been shown and described and are pointed out in the annexed claim, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the present invention.