Pump provided with diaphragms

Abstract

In a pump, a plurality of pump chambers are defined by a plurality of diaphragms. A pivotable member is attached to the diaphragms. A rotator has a fitting hole formed in one face eccentrically from a rotation center of rotator. A shaft member is inserted into the fitting hole to connect the pivotable member and the rotator. An entrance edge of the fitting hole is chamfered.

What is claimed is:  
     
         1 . A pump, comprising: 
 a plurality of diaphragms, which define a plurality of pump chambers;    a pivotable member, attached to the diaphragms;    a rotator, having a fitting hole formed in one face eccentrically from a rotation center of rotator; and    a shaft member, inserted into the fitting hole to connect the pivotable member and the rotator,    wherein an entrance edge of the fitting hole is chamfered.    
     
     
         2 . The pump as set forth in  claim 1 , wherein a groove portion having slopes extending from a vicinity of the rotation center toward the fitting hole is formed on the one face of the rotator while being inclined downwardly.  
     
     
         3 . The pump as set forth in  claim 2 , wherein a width of the groove portion is made narrower as closer to the fitting hole.