Patent ID: 6073940
Filing Date: 2000-06-13
Classification: B23B,Y10T

Abstract:
In a chuck assembly including a hollow chuck body defining a frontal surface, the frontal surface having an opening therethrough communicating with the interior of the chuck body, a master jaw supported by said chuck body and exposed at the opening for movement relative to the chuck body the chuck body in one direction and in another direction opposite the one direction, and jaw actuating means within the chuck body for moving the master jaw in the one direction and in the other direction opposite the one direction, the improvement comprising a canopy plate having a rear surface generally overlying said frontal surface, said canopy plate having an aperture therethrough in general registry with said opening, attaching means for securing said canopy plate to said chuck body, and a sealing member disposed rearwardly of and in sealing engagement with said canopy plate and generally surrounding said aperture, said sealing member cooperating in sealing engagement with said master jaw in all positions of the master jaw relative to the chuck body to seal said opening and prevent entry of foreign material into said interior of said chuck body through said opening.