Valve change-over device

Abstract

A valve change-over device includes a motor-driving unit having a spindle fitted thereon with a sleeve having at least one side wall axially bored with a guide slot. A pushing rod received in the sleeve is fixed with a position-limiting member at a location corresponding with the guide slot of the sleeve. A valve body is installed at the front open end of the sleeve, having a valve rod axially inserted in the interior. The spindle of the motor-driving unit is rotated to actuate the pushing rod to slidably shift in the guide slots of the sleeve and control the valve rod to open and close the through holes of the valve body for permitting air to flow in and exhaust out and controlling air flowing directions, able to quickly change the phase and elevate the working efficiency of the valve body.

1 . A valve change-over device comprising:
 a motor-driving unit having its front end provided with a spindle extending outward, said spindle having a pushing wheel eccentrically and pivotally disposed thereon;   a sleeve fitted on said spindle, said sleeve at least having one side wall provided with a guide slot;   a pushing rod received in said sleeve, said pushing rod fixed with a position-limiting member at a location corresponding with said guide slot of said sleeve to enable said pushing rod to restrictedly and slidably shift in said guide slot, said pushing rod having its rear end formed with a cam surface corresponding with said pushing wheel of said motor-driving unit for resisting against said pushing wheel; and   a valve body provided with a valve rod to be moved together with said pushing rod, said valve rod functioning to control positions of said valve body.   
   
   
       2 . The valve change-over device as claimed in  claim 1 , wherein said valve body is assembled at a front open end of said sleeve and formed with at least three-directional through openings, said valve rod axially inserted and positioned in said valve body, said valve rod having its surface fitted thereon with at least one rubber ring contacting with an inner wall of said valve body, said rubber ring of said valve rod functioning to control opening and closing of said through holes of said valve body for permitting air to flow in and exhaust out and controlling air flowing directions, said valve rod having another end opposite to said sleeve disposed with an elastic member for actuating said pushing rod to recover its position. 
   
   
       3 . The valve change-over device as claimed in  claim 1 , wherein said guide slot is elongate and oval, bored axially in one side of said sleeve, while said position-limiting member is shaped as a round block to be slidably positioned in said guide slot.