Miniature air compressor

Abstract

A miniature air compressor includes a motor having a shaft for driving a crank. A cylinder has an open end allowing a second end of the crank extending into the cylinder for compressing the air and a close end opposite to the open end of the cylinder. The cylinder has an inlet and an outlet respectively defined in the close end thereof and extending to communicate with an inner periphery of the cylinder. A cover longitudinally mounted to the close end of the cylinder. An input passage and an output passage are respectively defined in the cover. The input passage and the output passage respectively communicate with the inlet and the outlet of the cylinder. A valve sheet secured between close end of the cylinder and the cover. The valve selectively closes the outlet in the cylinder and the input passage in the cover.

1 . A miniature air compressor comprising: 
 a motor having a shaft longitudinally extending therefrom;    a transmission device pivotally connected to the shaft of the motor, the transmission device including a connector eccentrically securely mounted to a free end of the shaft and a crank having a first end pivotally connected to the connector and a second end opposite to the first end of the crank;    a bracket securely mounted to the motor and having a through hole defined therein;    a cylinder extending through the through hole in the bracket and secured on the bracket, the cylinder having an open end allowing the second end of the crank extending into the cylinder for compressing the air in the cylinder and a close end opposite to the open end of the cylinder, the cylinder having an inlet and an outlet respectively defined in the close end thereof and extending to communicate with an inner periphery of the cylinder;    a cover longitudinally mounted to the close end of the cylinder, an input passage and an output passage respectively defined in and extending through the cover, the input passage communicating with the inlet in the close end of the cylinder and the output passage communicating with the outlet in the close end of the cylinder; and    a valve sheet secured between close end of the cylinder and the cover, the valve sheet including a first valve selectively closing the input passage when the second end of the crank is moved toward the cover and a second valve selectively closing the outlet in the close end of the cylinder when the second end of the crank is moved away from the close end of the cylinder.    
   
   
       2 . The miniature air compressor as claimed in  claim 1  further comprising a base member for supporting the motor and multiple absorbers mounted between the base member and the motor for absorbing the vibration and reducing the noise from the motor.  
   
   
       3 . The miniature air compressor as claimed in  claim 1 , wherein the crank comprises a resilient valve longitudinally secured on the second end of the crank by a fastener.  
   
   
       4 . The miniature air compressor as claimed in  claim 1 , wherein the cylinder comprises a first inclined stopped extending therefrom into the inlet to prevent the first valve of the valve sheet from overly wiggled in the inlet when the second end of the crank is moved away from the close end of the cylinder.  
   
   
       5 . The miniature air compressor as claimed in  claim 1 , wherein the cover comprises a second inclined stopper extending therefrom into the output passage in the cover to prevent the second valve of the valve sheet from overly wiggled in the output passage in the cover when the second of the crank is moved toward the close end of the cylinder.