Cylinder assembly for a mini air compressor

Abstract

A cylinder assembly for a mini air compressor includes a cylinder, a discharge check valve, a piston, a supply check valve and a piston rod. The cylinder has two open ends, and the piston with an open end and a closed end is slidably mounted in the cylinder. A supply check valve is mounted on the closed end of the piston. A discharge check valve is adapted to mount on and seal one end of the cylinder. At least one of the supply check valve and the discharge check valve has with a flexible, resilient disk. Two check valves are configured such that only one valve opens at a time when the piston slides in the cylinder.

What is claimed is:  
     
         1 . A cylinder assembly for a mini air compressor comprising: 
 a cylinder with a first and a second open ends;    a discharge check valve with a body mounted on the first open end of the cylinder and at least one discharge port defined through the body of the discharge check valve;    a strongback mounted over and holding the discharge check valve on the first open end of the cylinder;    a cylindrical piston with an inside and an outside, an open end and a closed end slidably mounted in the cylinder through the second open end of the cylinder with the open end of the piston facing an outside of the cylinder;    a piston rod pivotally attached to the inside of the piston through the open end of the piston; and    a supply check valve mounted on the closed end of the piston facing an inside of the cylinder and at least one supply port defined through the closed end of the piston,    wherein at least one of the discharge and supply check valves has a disk stub with a short shaft and a slightly enlarged head formed on the valve and a resilient disk mounted on said disk stub and corresponding to the at least one port in the valve to cover said corresponding at least one port.    
     
     
         2 . The cylinder assembly for a mini air compressor as claimed in  claim 1 , wherein the supply valve has a disk stub formed on the closed end of said piston and extends toward the discharge check valve and a resilient disk mounted on said disk stub to cover said supply ports to allow said supply check valve to open toward said discharge check valve.  
     
     
         3 . The cylinder assembly for a mini air compressor as claimed in  claim 1 , wherein the discharge valve has a disk stub facing said strongback and formed on the body of said discharge check valve and a resilient disk mounted on said disk stub to cover said discharge ports to allow the discharge check valve to open toward said strongback.  
     
     
         4 . The cylinder assembly for a mini air compressor as claimed in  claim 1 , wherein a discharge fitting is formed on the strongback.