Patent ID: 8747083

Claim:
An air compressor comprising: a cylinder housing including a chamber formed therein, an outlet receptacle provided on said cylinder housing and including a compartment formed therein, and including a partition provided between said cylinder housing and said outlet receptacle, and including an air passage formed in said partition and communicative with said chamber of said cylinder housing for receiving a pressurized air from said chamber of said cylinder housing, and communicative with said compartment of said outlet receptacle, a piston slidably received in said chamber of said cylinder housing and having a piston rod extended therefrom, a motor coupled to said piston for moving said piston relative to said cylinder housing in a reciprocating action in order to generate a pressurized air and for allowing the pressurized air to be supplied from said chamber of said cylinder housing to said compartment of said outlet receptacle, and a spring-biased check valve disposed in said outlet receptacle and engaged with said partition for selectively blocking said air passage of said partition and for guiding the pressurized air to flow from said chamber of said cylinder housing into said compartment of said outlet receptacle, and to prevent the pressurized air from flowing backwardly from said compartment of said outlet receptacle into said chamber of said cylinder housing, wherein: said compartment of said outlet receptacle includes an inner diameter D 2 no less than an inner diameter D 1 of said chamber of said cylinder housing, said cylinder housing includes a plurality of pegs extended from said partition and extended into said compartment of said outlet receptacle, and includes a plurality of gaps formed between said pegs, and includes a space formed within said pegs for slidably receiving said check valve.