Air compressor

Abstract

An improved air compressor includes a cylinder that is fitted with a piston body and defines at its top wall a plurality of exit holes which are approximately equal in diameter and can be regulated by plugs to enable the cylinder to communicate with an air storage container. The exit holes are normally sealed by the plugs with the assistance of compression springs when the air compressor is not in operation. The exit holes allow the compressed air produced in the cylinder to quickly enter the air storage container, so that the piston body can conduct reciprocating motion more smoothly and thus the performance of the air compressor can be increased.

I claim: 
     
       1. In an air compressor including a main frame for mounting a motor which rotates a gear to drive a piston body fitted in a cylinder to conduct reciprocating motion for producing compressed air which is allowed to enter an inner space of an air storage container; wherein the improvement comprises:
 the cylinder defines at a top wall thereof a plurality of exit holes of equal dimension, the exit holes being regulated by a control mechanism to be opened or closed, the control mechanism including a plurality of plugs and a plurality of compression springs capable of urging the plugs to seal the exit holes, respectively, the air storage container provided with two opposite coupling means at a bottom edge thereof, each coupling means including a base portion extending outwardly from the bottom edge of the air storage container, and an L-shaped holding portion integrally formed at one end of the base portion distal from the bottom edge of the air storage container, the air storage container provided at an inner surface thereof with a plurality of columns corresponding to the compression springs, each of the compression springs having one end forcing against a corresponding plug, and having another end being fitted around a corresponding column, wherein each of the columns is located at a predetermined height above the corresponding plug so as to limit movement of the corresponding plug. 
 
     
     
       2. The air compressor of  claim 1 , wherein the cylinder has a tubular projection formed on the top wall, the tubular projection provided at its outer surface with two opposite lugs each having an engagement section, the L-shaped holding portion of each coupling means capable of engaging with the engagement section of one of the two lugs, so that the air storage container is detachably assembled onto the cylinder. 
     
     
       3. The air compressor of  claim 1 , wherein the cylinder has a tubular projection formed on the top wall, the tubular projection provided at its outer surface with two opposite lugs each having an engagement section, the L-shaped holding portion of each coupling means capable of engaging with the engagement section of one of the two lugs, each of the two coupling means further including an operation portion extending from the L-shaped holding portion in a direction opposite to the base portion, so that the air storage container is detachably assembled onto the cylinder. 
     
     
       4. The air compressor of  claim 1 , wherein the cylinder has a tubular projection formed on the top wall, the tubular projection provided at its outer surface with a circular flange and defining an annular groove between the circular flange and the top wall for allowing the L-shaped holding portion of each coupling means to be inserted into the annular groove and engaged with the circular flange, so that the air storage container is detachably assembled onto the cylinder. 
     
     
       5. The air compressor of  claim 1 , wherein the cylinder has a tubular projection formed on the top wall, the tubular projection provided at its outer surface with two opposite lugs each having an engagement section , the L-shaped holding portion of each coupling means capable of engaging with the engagement section of one of the two lugs, each of the two coupling means further including an operation portion which is integrally formed at one end of the base portion distal from the bottom edge of the air storage container and located at a side of the base portion opposite to the L-shaped holding portion, so that the air storage container is detachably assembled onto the cylinder. 
     
     
       6. The air compressor of  claim 5 , wherein the tubular projection further provided at its outer surface with a first rectangular flange defining a plurality of first positioning holes, the air storage container further provided at its bottom edge with a second rectangular flange defining a plurality of second positioning holes corresponding to the first positioning holes of the first rectangular flange, so that the air storage container is detachably assembled onto the cylinder. 
     
     
       7. An air compressor, which comprises a main frame for mounting a motor which rotates a gear to drive a piston body fitted in a cylinder to conduct reciprocating motion for producing compressed air which is allowed to enter an inner space of an air storage container; wherein the cylinder defines at a top wall thereof a plurality of exit holes of equal dimension, the exit holes being regulated by a control mechanism to be opened or closed, the control mechanism including a plurality of plugs and a plurality of compression springs capable of urging the plugs to seal the exit holes, respectively, the air storage container provided with two opposite coupling means at a bottom edge thereof, each coupling means including a base portion extending outwardly from the bottom edge of the air storage container, and an L-shaped holding portion integrally formed at one end of the base portion distal from the bottom edge of the air storage container; wherein the air storage container is provided at an inner surface thereof with a plurality of columns corresponding to the compression springs, each of the columns having a base round portion, a middle round portion, and an end round portion; each of the compression springs has one end forcing against a corresponding plug, and has another end being fitted around the middle round portion of a corresponding column and forcing against the base round portion of the corresponding column, wherein each of the end round portions of the columns is located at a predetermined height above the corresponding plug so as to limit movement of the corresponding plug.