Patent ID: 9149873
Filing Date: 2015-10-06
Classification: B23B,Y10T

Abstract:
1. An accessory tool retention assembly for a rotary tool comprising: a collet chuck configured to be coupled to an output shaft of a motor of a rotary tool, the collet chuck including a main body defining a collet receiving passage and a leading portion defining an opening that leads into the collet receiving passage; a collet including a cylindrical body defining a collet axis and configured to fit longitudinally within the collet receiving passage of the collet chuck, the collet having a leading end portion, a trailing end portion, and at least one slot that extends along a portion of a length of the body through the leading end portion, the at least one slot dividing the collet into a plurality of flexible segments, each of the plurality of flexible segments including an intermediate portion that is arranged parallel to the collet axis when the collet is in a relaxed state and an outwardly projecting end portion that projects radially outwardly from the collet; and a nose cap positioned on the leading portion of the collet chuck, the nose cap including a front wall portion defining an insertion opening aligned with the opening and the passage of the collet chuck, the insertion opening having a peripheral shape that matches a peripheral shape of the collet, the front wall portion including a detent structure that is interposed in a path of movement of the collet into and out of the collet receiving passage while the collet is in a relaxed state, wherein the detent structure is positioned in a path of movement of the outwardly projecting end portion of one of the flexible segments of the collet when the collet is in a relaxed state, and wherein the flexible segments are configured to be deflected inwardly to provide clearance for the outwardly projecting end portion of the one of the flexible segments to move past the detent structure.