Air compressor having improved valve device

Abstract

An air compressor includes a cylinder housing having an outlet tube, a piston slidably received in the cylinder housing and having a piston rod and an air passage, and a motor coupled to the piston for moving the piston relative to the cylinder housing in a reciprocating action, in order to generate pressurized air. A valve device includes one side secured to the piston, and a limiting device may be used for limiting the other side of the valve device to move relative to the piston and to prevent the other side of the valve device from being over bent relative to the one side of the valve device or relative to the piston. The limiting device includes an ear located above the valve device for engaging with and for limiting the other side of the valve device to bend or to move relative to the piston.

1 . An air compressor comprising: 
 a cylinder housing including a chamber formed therein, and including an outlet tube having a compartment formed therein and communicating with said chamber of said cylinder housing for receiving pressurized air from said chamber of said cylinder housing,    a piston slidably received in said chamber of said cylinder housing and having a piston rod extended therefrom, and having an air passage formed therein, and having a first side and a second side,    means for moving said piston relative to said cylinder housing in a reciprocating action, in order to generate pressurized air,    a valve device including a first side secured to said first side of said piston and including a second side opposite to said first side thereof, and    means for limiting said second side of said valve device to move relative to said piston and to prevent said second side of said valve device from being over bent relative to said first side of said valve device.    
   
   
       2 . The air compressor as claimed in  claim 1 , wherein said valve device includes at least one fastener securing said first side of said valve device to said first side of said piston.  
   
   
       3 . The air compressor as claimed in  claim 1 , wherein said valve device includes a notch formed in said first side thereof, for increasing a resilience of said valve device.  
   
   
       4 . The air compressor as claimed in  claim 1 , wherein said limiting means includes an ear extended therefrom and located above said second side of said valve device for engaging with said second side of said valve device and for limiting said second side of said valve device to bend or move relative to said piston.  
   
   
       5 . The air compressor as claimed in  claim 4 , wherein said valve device includes an opening form in said second side thereof, and said limiting means includes a limiting device extended from said piston and extended through said opening of said valve device, and having said ear extended from said limiting device.  
   
   
       6 . The air compressor as claimed in  claim 1 , wherein said valve device includes an inner peripheral slot formed therein to form a first blade member and a second blade member and to have said inner peripheral slot located between said first blade member and said second blade member.  
   
   
       7 . The air compressor as claimed in  claim 6 , wherein said valve device includes at least one coupling member provided in said second side thereof and coupled between said first blade member and said second blade member, for coupling said first blade member and said second blade member together.  
   
   
       8 . The air compressor as claimed in  claim 1 , wherein said piston includes a bar extended upwardly therefrom for engaging with said valve device and for positioning and for anchoring said valve device.  
   
   
       9 . The air compressor as claimed in  claim 8 , wherein said valve device includes a notch formed in said first side thereof, and said piston includes a projection extended from said bar for engaging with said notch of said valve device.  
   
   
       10 . The air compressor as claimed in  claim 1  further comprising a supporting base including a plate to support said cylinder housing, said cylinder housing including a valve seat provided in said outlet tube and located between said outlet tube and said cylinder housing, and a spring-biased check valve disposed in said outlet tube and engaged with said valve seat, to limit the pressurized air to flow from said chamber of said cylinder housing into said compartment of said outlet tube only, and to prevent the pressurized air from flowing backwardly from said compartment of said outlet tube into said chamber of said cylinder housing.  
   
   
       11 . The air compressor as claimed in  claim 10 , wherein said moving means includes a motor attached to said plate and having a spindle extended through said plate, and an eccentric member coupled to said spindle and having a pin coupled to said piston rod, to move said piston relative to said cylinder housing.  
   
   
       12 . The air compressor as claimed in  claim 11 , wherein said plate includes a gear rotatably attached thereto and having a space formed by a peripheral casing to receive said eccentric member.  
   
   
       13 . The air compressor as claimed in  claim 1 , wherein said cylinder housing includes a first duct, a second duct, and at least one third duct extended outwardly from said outlet tube and communicating with said compartment of said outlet tube, for receiving the pressurized air from said outlet tube, a pressure gauge attached to said first duct, a nozzle coupled to said second duct, and a relief valve attached to said at least one third duct.