Air compressor for tire inflating combination

Abstract

An air compressor device includes a piston slidably engaged in a cylinder housing and having an outer peripheral groove formed by a base peripheral surface and two side surfaces, to form an outer opening and an inner recess, a motor is coupled to the piston to move the piston in the cylinder housing in reciprocating action, and a sealing ring is engaged in the outer peripheral groove of the piston, for making an air tight seal between the cylinder housing and the piston. The sealing ring includes a peripheral channel to form a base segment, an inner leg and an outer leg, the outer leg is extended out of the outer opening of the piston, for slidably engaging with the inner peripheral surface of the cylinder housing, even when the piston is tilted relative to the cylinder housing.

1 . An air compressor assembly comprising: 
 a cylinder housing including a chamber formed therein and defined by an inner peripheral surface,    a piston slidably engaged in said cylinder housing, said piston including an outer peripheral groove formed therein and defined by a base peripheral surface and two side surfaces, to form an outer opening and an inner recess,    a motor for coupling to said piston, to move said piston in said cylinder housing in reciprocating action, and    a sealing ring engaged in said outer peripheral groove of said piston, for slidably engaging with said inner peripheral surface of said cylinder housing, and for making an air tight seal between said cylinder housing and said piston,    said sealing ring including a peripheral channel formed in an upper portion thereof, to form a base segment, an inner leg and an outer leg, said inner leg being engaged in said inner recess of said piston, and said outer leg being extended out of said outer opening of said piston, for slidably engaging with said inner peripheral surface of said cylinder housing, even when said piston is tilted relative to said cylinder housing.    
   
   
       2 . The air compressor assembly as claimed in  claim 1 , wherein said outer leg of said sealing ring includes a flat surface formed in a free end portion thereof, and parallel to said base segment thereof.  
   
   
       3 . The air compressor assembly as claimed in  claim 2 , wherein said outer leg of said sealing ring includes an inclined surface formed in said free end portion thereof, and formed beside said flat surface thereof.  
   
   
       4 . The air compressor assembly as claimed in  claim 1 , wherein said piston includes a pathway formed therein for air flowing purposes, and includes a spring blade attached to block said pathway thereof when said piston is moved relative to said cylinder housing in a compressing stroke, said spring blade is forced to open said pathway of said piston when said piston is moved relative to said cylinder housing in a returning stroke.  
   
   
       5 . The air compressor assembly as claimed in  claim 1 , wherein said motor includes a spindle having a pinion attached thereto, a gear rotatably engaged with said pinion, for allowing said gear to be rotated and driven by said motor via said pinion, an eccentric member attached to said gear, and a shaft attached to said eccentric member and offset from an axle of said gear, and coupled to said piston via a piston rod.  
   
   
       6 . The air compressor assembly as claimed in  claim 5 , wherein said motor includes a fan device attached thereto and rotated and driven by said motor to generate cooling air.  
   
   
       7 . The air compressor assembly as claimed in  claim 5  further comprising a base holder, a casing disposed in base holder, and said gear is rotatably received and engaged in said casing, and engaged with said pinion.  
   
   
       8 . The air compressor assembly as claimed in  claim 1 , wherein said cylinder housing includes an outlet tube provided thereon, and passage formed therein and communicating with said outlet tube, said outlet tube includes a first outlet port formed therein for coupling to a hose, a second outlet port provided therein for coupling to a pressure gauge, and a third outlet port provided therein for coupling to a relief valve.  
   
   
       9 . The air compressor assembly as claimed in  claim 8 , wherein said third outlet port of said outlet tube includes an inclined valve seat provided therein, and an inner thread formed therein for threading with a cap, said cap includes a bore formed therein and communicating with said outlet tube and said cylinder housing, for relieving over-pressurized air.  
   
   
       10 . The air compressor assembly as claimed in  claim 9 , wherein said relief valve includes a valve element slidably engaged in said outlet tube, and engageable with said valve seat of said outlet tube, and a spring member engaged between said valve element and said cap, for biasing said valve element to engage with said valve seat of said outlet tube.