Patent ID: 6971498

Claim:
Centering device for centering work pieces comprising: a hollow casing having front and side walls; a centering rod slidably supported by the casing, to protrude from a guide hole at the front wall; actuation means operatively connected to the centering rod, to move the same rod from a retracted to an advanced position; and cleaning means for cleaning the centering rod and preventing the infiltration of dirt, into the casing of the centering device; wherein said cleaning means for the centering rod comprise: at least one elastically yieldable annularly-shaped scraping member, said annular scraping member having inner scraping edges and, an outer peripheral edge having a geometrical center; a plurality of angularly spaced apart inner cross-cuts being provided to divide the scraping member into a plurality of scraping sections, each scraping section having an arch-shaped inner scraping edge, the scraping sections in a flat condition of the scraping member having a same bending radius, and bending centers differently arranged around the geometrical center of the scraping member; and locking means for locking and conforming the scraping member against a conically-shaped annular shoulder surface, and to urge the inner edges of the scraping sections against side surface of the centering rod.