Patent ID: 8292304
Filing Date: 2012-10-23
Classification: B23B,B25B,Y10S,Y10T

Abstract:
1. A tool-bit holder for tool-bit shanks of varying profiles, the tool-bit holder comprising: a hub having a longitudinal bore having an open end, the longitudinal bore having a first section having a first profile, and the longitudinal bore having a second section having a second profile of a smaller area than the first profile, and the hub having at least one radial slot communicating with the first section of the longitudinal bore; a collar attached to the hub thereby forming a channel over the radial slot; a sleeve axially slidably mounted along the hub and disposed annularly about the hub wherein the sleeve is at least partially within the channel and has at least one radial bore, the radial bore of the sleeve being in communication with the radial slot of the hub; a shank engaging element disposed within the radial bore of the sleeve and the radial slot of the hub and the channel of the collar; at least one inner ramp face on the collar for engaging the shank engaging element wherein the inner ramp face extends radially from an interior collar face; and a spring biasing the sleeve towards the interior collar face wherein the shank engaging element in the radial bore of the sleeve engages the inner ramp face and the sleeve is slidably positionable along the hub between a locking position and a retracting position; wherein contact between a tool-bit shank having the second profile and the shank engaging element urges the shank engaging element radially outwardly against the at least one inner ramp face to a first extent and wherein contact between a tool-bit shank having the first profile and the shank engaging element urges the shank engaging element radially outwardly against the at least one inner ramp face to a second extent that is greater than the first extent.