Low-profile impeller bolt

Abstract

An impeller for a self-primer pump is structured for attachment to the terminal end of a drive shaft by means of a bolt that is configured to provide a low profile such that the eye of the impeller is rendered capable of processing larger solids that are entrained in fluid.

1 . An impeller for a self-priming pump, comprising: 
 an impeller structured for processing solids-entrained fluid and having a shroud, at least one vane extending outwardly from said shroud and a central opening;    a bolt insertable through said central opening of said impeller having a threaded shaft for connection to a drive shaft on which said impeller is positioned and a unitarily formed head and washer portion having tool-connection means for insertion and tightening of said bolt in the drive shaft, said unitarily formed head and washer portion having a low-profile.    
     
     
         2 . The impeller of  claim 1  wherein said impeller is further structured with a recessed land surrounding said central opening and said unitarily formed head and washer of said bolt is sized in circumference to be received in said recessed land when secured to the drive shaft.  
     
     
         3 . The impeller of  claim 1  wherein said bolt extends above said shroud a distance of from about one sixteenth of an inch to about one half inch.