Abstract:
An improved structure of an air inflation device is disclosed. External air is drawn to the motor and cylinder to provide rapid cooling so that the efficiency of the motor is maintained. In the present invention, a plurality of air filters is used to filter air. Thereby the air inflation device is useful and practical.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to an air inflation device, and in particular, an inflation device which draws air externally and cool the air cylinder and the motor. 
   2. Description of the Prior Art 
   Conventional DIY air inflation device has the drawbacks of insufficient inflation pressure, and excessive noise.  FIG. 1  shows a conventional mini size air inflation device A 1  that can solve the drawback of excessive noise. However, the heat dissipated by the motor in the course of operation has affected seriously the efficiency of the motor. In other words, this conventional air inflation device has a very short live of use. Besides, in the course of operation of the air inflation device, heat dissipation to the motor is not provided to the motor and the cylinder. In some cases, the excessive heat and current overload will damage the socket for cigarette lighter within the vehicle. Accordingly, it is an object of the present invention to provide an improved structure of an inflation device, which mitigates the above drawbacks. 
   SUMMARY OF THE PRESENT INVENTION 
   The present invention relates to an air inflation device, and in particular, an inflation device which draws air externally and cool the air cylinder and the motor. 
   Accordingly it is a main object of the present invention to provide an improved structure of an inflation device having a motor, a mini-sized button-type air filter, a front mounting seat, a muffling pad, a muffling board seat, an air cylinder mounting, a piston, a cylinder body, an cylinder cover and a pressure gauze, characterized in that the motor has a sealing mounting seat provided with one or more than one through hole disposed with the air filter, the front mounting seat is locked with a covering cap, and a cylinder seat mounting plate of the motor is also provided with a through hole to lead air into the cylinder body, and the piston within the cylinder body is connected to the main shaft of the motor so that reciprocation movement is obtained, the piston is provided with an air-inlet hole and the top of the air-inlet hole is provided with an air-sealing pad, and an air discharge hole is provided within the interior of a through slot of the cylinder cover and the top face of the air discharge hole is also provided with a sealing pad, thereby when the reciprocating movement is initiated, air inflation is obtained and the motor and the cylinder body are provided with cooling air. 
   Another object of the present invention is to provide an improved structure of an inflation device, wherein the device is provided with excellent heat dissipation so that the excessive heat caused the burning of the motor is mitigated. 
   Yet another object of the present invention is to provide an improved structure of an air inflation device, wherein the cost of manufacturing is low and the longevity of the device is extended. 
   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 plan and partial sectional view of a conventional air inflation device. 
       FIG. 2  is a perspective view of a preferred embodiment of the present invention. 
       FIG. 3  is a perspective exploded view of the various parts of the present invention. 
       FIG. 4  is a perspective view of the air filter in accordance with the present invention. 
       FIG. 5  is another preferred embodiment of air filter in accordance with the present invention. 
       FIG. 5A  is another preferred embodiment of an air filter in accordance with the present invention. 
       FIG. 6  is a sectional view of the air filter in accordance with the present invention. 
       FIG. 7  is a sectional view of the present invention. 
       FIG. 8  is a sectional enlarged view of the air discharging sealing pad of the present invention. 
       FIG. 9  is a sectional enlarged view of the air inlet sealing pad of the present invention. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
   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  FIGS. 2 and 3  there is shown an improved structure of an air inflation device comprising a motor  1 , a mini-sized button-type air filter  2 , a front mounting seat  3 , a muffling pad  4 , a muffling board seat  5 , an air cylinder mounting  6 , a piston  7 , a cylinder body  8 , an cylinder cover  9  and a pressure gauze  10 , characterized in that the motor  1  has a sealing mounting seat  11  for sealing the opening at the rear of the motor  1 . The mounting sear  11  is extended to a bottom-bending leg seat  12 . The motor  1  is provided with forward opening which is directly shut by the air cylinder seat  13  at the front opening of the motor  1  such that the motor and the air cylinder seat  13  are combined as one unit. The sealing mounting seat  11  of the motor  1  is provided with one or more than one through hole  111  disposed with the air filter  2 , allowing external air to be withdrawn. The cylinder seat locking plate  132  is provided with through holes  133  of equal number and the through hole  133  can directly communicate with the cylinder body B so as to draw air. This is shown in  FIG. 7 . 
   As shown in  FIGS. 2 and 3 , the opening end  131  of the cylinder seat  13  is provided with a muffling plate seat  5  having mounted with a muffling pad  4  to seat off the opening end  131 . The muffling end  5  is provided with bended leg seat  51  so as to correspond to the leg seat  12  of the sealing mounting seat. The top section of the cylinder  13  is provided with an air cylinder mounting  6 , pistons  7 , cylinder body  8  and cylinder cover  9  to form into an entire cylinder body B. The piston  7  has an eccentric block  71  connected to the main shaft  110  such that the piston  7  can form reciprocation movement within the cylinder body B. The lateral side of the air cylinder cover  9  is mounted with pressure gauze  10  to show the pressure reading. 
   As shown in  FIGS. 8 and 9 , the piston  7  within the cylinder body B is connected to the main shaft  110  of the motor  1  so that reciprocation movement is obtained. The piston  7  is provided with an air-inlet hole  72  and the top of the air-inlet hole  72  is provided with an air-inlet sealing pad  73 , and an air discharge hole  91  is provided within the interior of a through slot of the cylinder cover  9  and the top face of the air discharge hole  91  is also provided with an air-discharge sealing pad  92 . 
   When the motor  1  is in operation, the rapid rotation of the rotor  112  provides turbulent air and together with the rapid reciprocation movement of the piston  7 , the absorbing force that produced will lead air passed through the motor  1  to the cylinder B so as to obtain heat dispersion effect. When the piston  7  moves downward, the pressure that produced at that instance pushes the air inlet sealing pad  73  and the air is lead to the cylinder mounting  6 . When the piston  7  moves upward the compressed will push away the air discharge sealing pad  92  at the air inlet hole  91 . At this instance the sealing pad  73  is in a sealing status and the compressed air can be rapidly discharged away. Thereby when the reciprocating movement is initiated, air inflation is obtained and the motor and the cylinder body are provided with cooling air. Therefore the operation capability of motor is lengthened. 
   Referring to  FIGS. 4 ,  5  and  5 A, the air filter  2  is positioned at the through hole  111  of the sealing mounting seat to provide leading external air for heat dispersion. The external of the installed filter  2  is locked and covered by the front mounting seat  3  such that the air filter  3  is concealed and hidden. In accordance with the present invention, the air filter  2  includes a top cover  21  and a cup body  22  and the face of the top cover  21  is provided with air holes  211  and the outer circumferential edge is provided with a water sealing edge  212  to prevent water drops into the air holes  211 . The cup body  22  is provided with an insertion section  221  and an air communication slot  222  for filling of air filtering material  23  for air purification. Referring to FIGS.  5  and  5 - 1 , the insertion section is provided with a snap engagement or a screw-typed lock. These mounting methods are of similar function. 
   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.